Unit 3 | unit 5 electrical

MSE

Unit - 3

Electrical

Q1) What is OHE?

A1)

This article is set the transmission of electrical strength to street and rail vehicles. For transmission of bulk electric strength to well known consumers, see Electric strength transmission. For power lines installed on pylons, see Overhead strength line. For traces sporting information, see Overhead cable. An overhead line or overhead twine is an electrical cable this is used to transmit electric strength to electric powered locomotives, trolleybuses or trams. It is thought variously as: Overhead catenaries Overhead touch system (OCS) Overhead equipment (OHE) Overhead line equipment (OLE or OHLE) Overhead traces (OHL) Overhead wiring (OHW) Traction twine Trolley twine. In this article, the accepted time period overhead line is used, as utilized by the International Union of Railways.

An overhead line includes one or greater wires (or rails, especially in tunnels) located over rail tracks, raised to an excessive electric capability through connection to feeder stations at normal intervals. The feeder stations are normally fed from an excessive-voltage electric grid.

Electric trains that accumulate their present day from overhead traces use a tool inclusive of a pantograph, bow collector or trolley pole. It presses towards the bottom of the bottom overhead wire, the touch wire. Current creditors are electrically conductive and permit present day to go with the drift via to the educate or tram and returned to the feeder station via the metallic wheels on one or each walking rails. Non-electric powered locomotives (inclusive of diesels) can also additionally by skip alongside those tracks without affecting the overhead line, even though there can be problems with overhead clearance. Alternative electric strength transmission schemes for trains consist of 1/3 rail, ground-stage strength supply, batteries and electromagnetic induction.

To reap precise high-pace modern-day series, it's far important to maintain the touch twine geometry inside described limits. This is commonly done through helping the touch twine from a 2nd twine called the messenger twine (within side the US & Canada) or catenaries (within side the UK). This twine approximates the herbal course of a twine strung among points, a catenaries curve, therefore the use of "catenaries" to explain this twine or occasionally the entire device. This twine is connected to the touch twine at normal durations through vertical wires called "droppers" or "drop wires".

It is supported frequently at structures, through a pulley, hyperlink or clamp. The entire device is then subjected to mechanical anxiety. As the pantograph actions alongside below the touch twine, the carbon insert on pinnacle of the pantograph turns into worn with time. On directly track, the touch twine is zigzagged barely to the left and proper of the centre from every aid to the following in order that the insert wears evenly, therefore stopping any notches. On curves, the "directly" twine among the helps reasons the touch factor to go over the floor of the pantograph because the teach travels across the curve. The motion of the touch twine throughout the pinnacle of the pantograph is referred to as the "sweep".

The zigzagging of the overhead line isn't required for trolley poles. For tramways, a touch twine without a messenger twine is used. Depot regions generally tend to have most effective a unmarried twine and are called "easy device" or "trolley twine". When overhead line structures have been first conceived, precise modern-day series turned into feasible most effective at low speeds, the use of a unmarried twine. To permit better speeds, extra kinds of device have been developed: Stitched device makes use of an extra twine at every aid structure, terminated on both aspect of the messenger/centenary twine.

Compound device makes use of a 2nd aid twine, called the "auxiliary", among the messenger/centenary twine and the touch twine. Droppers aid the auxiliary from the messenger twine, at the same time as extra droppers aid the touch twine from the auxiliary. The auxiliary twine may be of a greater conductive however much less wear-resistant metal, growing transmission efficiency. Earlier dropper wires supplied bodily aid of the touch twine without becoming a member of the centenary and phone wires electrically. Modern structures use modern-day-wearing droppers, doing away with the want for separate wires. The gift transmission device originated approximately a hundred years ago. An easier device turned into proposed within side the Nineteen Seventies through the Pirelli Construction Company, which includes a unmarried twine embedded at every aid for 2.5meters (eight toes 2 in) of its duration in a clipped, extruded aluminum beam with the twine touch face exposed. A really better anxiety than used earlier than clipping the beam yielded a deflected profile for the twine that might be effortlessly treated at 250 miles consistent with hour (four hundred km/h) through a pneumatic servo pantograph with most effective three g acceleration.

Parallel overhead lines

An electric circuit calls for at the least conductors. Trams and railways use the overhead line as one facet of the circuit and the metallic rails as the alternative facet of the circuit. For a trolleybus or a trolley truck, no rails are to be had for the go back current, because the cars use rubber tires on the street surface. Trolleybuses use a 2nd parallel overhead line for the go back, and trolley poles, one contacting every overhead wire. (Pantographs are commonly incompatible with parallel overhead lines.) The circuit is finished with the aid of using the use of each wire. Parallel overhead wires also are used at the uncommon railways with three-segment AC railway electrification.

Cantilever maintain the meeting of touch wire, centenary and dropper meeting. It transfers all vertical load, lateral forces and bending second load thru insulator to Mast. It is an insulated swiveling kind structural member and continues the overhead centenary device in a function supporting easy contemporary series via way of means of the pantograph on the designed speed. It is bendy with all joints having swiveling association allowing motion in all direction. Material is so selected to keep away from any rusting and to ultimate the lifestyles the OHE (35-forty years)

Q2) What is Traction power?

A2)

A traction community or traction electricity community is an energy grid for the deliver of electrified rail networks. Alternatively, the three-segment alternating present day of the electricity grid may be transformed in substations with the aid of using rotary transformers or static inverters into the voltage and sort of present day required with the aid of using the trains.

A traction community or traction electricity community is a strength grid for the deliver of electrified rail networks. The set up of a separate traction community commonly is performed best if the railway in query makes use of alternating contemporary (AC) with a frequency decrease than that of the countrywide grid, together with in Germany, Austria and Switzerland. Alternatively, the three-section alternating contemporary of the electricity grid may be transformed in substations through rotary transformers or static inverters into the voltage and form of contemporary required through the trains. For railways which run on direct contemporary (DC), this approach is constantly used, in addition to for railways which run on single-section AC of reduced frequency, as in Mecklenburg-Western Pomerania, Saxony-Anhalt, Norway and Sweden. In those regions there aren't any traction contemporary networks.

Separate electricity for traction aside from commercial electricity usually has anciently roots. There isn't any cause nowadays to use one-of-a-kind frequencies or modern kinds than for transmission and for commercial usage. However, the benefit with DC traction changed into the less difficult transmission with unmarried copper wires to the feeder points.

The benefit with AC traction is the less difficult transmission over lengthy distances to the feeder points. Beyond those parameters and securing former investment, no proof exists to live with one-of-a-kind modern schemes in networks.

Dedicated traction modern-day traces are used while railways are furnished with low-frequency alternating modern-day (AC). The traction modern-day deliver line is attached to substations alongside the road of the railway and is commonly run one at a time from the overhead centenary cord from which the locomotives are fed. In nations wherein the electrical trains run with direct modern-day or with unmarried-section alternating modern-day with the frequency of the overall energy grid, the desired conversion of the modern-day is executed within side the substations, so once more no traction modern-day traces are required. Traction modern-day deliver traces aren't commonly laid parallel to the railway line, as a way to permit a shorter line period and to keep away from needless impacts to the electric device close to the railway line; this is also carried out to the modern-day deliver of a few rapid-transit railways working with alternating modern-day in Germany.

It is likewise feasible to put out the traction modern-day deliver on unique move beams proper at the overhead cord pylons above the centenary cord. Because the overhead line pylons have a smaller move phase than traction modern-day deliver masts, the move beams cannot be too wide, so the same old association of 4 conductor cables in a single degree cannot be used. In this case, a -degree association is used, or with electric powered circuits for double-railed traces the overhead line pylons for each guideline are ready with move beams for his or her very own traction modern-day device of conductor cables each.

In densely populated areas, there are pylons which deliver circuits for each traction modern-day and for three-section alternating modern-day for preferred energy. Such traces are observed in which proper of methods are rare.

In specific the parallel path of one hundred ten kV and 220 kV three-section AC is common. The use of 380 kV energy traces at the equal pylon calls for 220 kV insulators for the traction modern-day line, due to the fact in case the 380 kV line fails, voltage spikes can arise alongside the traction modern-day line, which the one hundred ten kV insulators cannot handle. As a rule, traction modern-day traces use unmarried conductors, but for the delivery of railways with excessive visitors and specially for the delivery of excessive velocity railway traces, package deal conductors are used.

Q3) What is Substations?

A3)

A substation is part of an electrical generation, transmission, and distribution machine. Substations rework voltage from excessive to low, or the reverse, or carry out any of numerous different vital functions. The phrase substation comes from the times earlier than the distribution machine has become a grid.

A substation is part of an electrical era, transmission, and distribution gadget. Substations rework voltage from excessive to low, or the reverse, or carry out any of numerous different critical functions. Between the producing station and consumer, electric powered energy may also waft thru numerous substations at exceptional voltage stages. A substation may also consist of transformers to extrude voltage stages among excessive transmission voltages and decrease distribution voltages, or on the interconnection of exceptional transmission voltages. Substations can be owned and operated through an electrical utility, or can be owned through a big commercial or business customer.

Generally, substations are unattended, counting on SCADA for faraway supervision and control. The phrase substation comes from the times earlier than the distribution gadget have become a grid. As critical era stations have become larger, smaller producing flowers had been transformed to distribution stations, receiving their strength deliver from a bigger plant rather than the usage of their very own mills. The first substations had been linked to handiest one energy station, wherein the mills had been housed, and had been subsidiaries of that energy station.

Substations can be defined through their voltage class, their programs inside the strength system, the approach used to insulate maximum connections, and through the fashion and substances of the systems used. These classes aren't disjointed; for example, to resolve a selected problem, a transmission substation can also additionally consist of huge distribution functions. Substation in Russia Transmission substation A transmission substation connects or greater transmission traces.

The most effective case is wherein all transmission traces have the identical voltage. In such cases, substation includes high-voltage switches that permit traces to be related or remote for fault clearance or maintenance. A transmission station can also additionally have transformers to transform among transmission voltages, voltage manipulate/strength thing correction gadgets including capacitors, reactors or static VAR compensators and gadget including segment moving transformers to govern strength waft among adjoining strength systems. Minimal HV station in Germany Transmission substations can variety from easy to complex. A small "switching station" can be little greater than a bus plus a few circuit breakers. The biggest transmission substations can cowl a massive area (numerous acres/hectares) with more than one voltage levels, many circuit breakers, and a massive quantity of safety and manipulate gadget (voltage and contemporary transformers, relays and SCADA systems). Modern substations can be applied the use of worldwide requirements including IEC Standard

Distribution substation Transformer tower in Germany

Medium voltage deliver on the front, low voltage output at the side. A distribution substation in Scarborough, Ontario disguised as a house, entire with a driveway, the front stroll and a mown garden and shrubs within side the front yard. A caution observe may be without a doubt visible at the "the front door". Disguises for substations are not unusual place in lots of towns. A distribution substation transfers energy from the transmission device to the distribution device of a vicinity.

It is uneconomical to at once join power clients to the principle transmission network, except they use massive quantities of energy, so the distribution station reduces voltage to a degree appropriate for neighborhood distribution. The center for a distribution substation is usually as a minimum transmission or sub-transmission strains. Input voltage can be, for instance, a hundred and fifteen kV, or something is not unusual place within side the vicinity. The output is some of feeders. Distribution voltages are usually medium voltage, among 24 kV and 33 kV, relying on the dimensions of the vicinity served and the practices of the neighborhood utility. The feeders run alongside streets overhead (or underground, in a few instances) and energy the distribution transformers at or close to the client premises. In addition to reworking voltage, distribution substations additionally isolate faults in both the transmission or distribution structures.

Distribution substations are usually the factors of voltage law, even though on lengthy distribution circuits (of numerous miles/kilometers), voltage law gadget can also be set up alongside the line. The downtown regions of massive towns characteristic complex distribution substations, with high-voltage switching, and switching and backup structures at the low-voltage side. More regular distribution substations have a switch, one transformer, and minimum centers at the low-voltage side.

Collector substation

In allotted era tasks inclusive of a wind farm or photovoltaic energy station, a collector substation can be required. It resembles a distribution substation even though energy glide is within side the contrary direction, from many wind generators or inverters up into the transmission grid. Usually for economic system of production the collector device operates round 35 kV, even though a few collector structures are 12 kV, and the collector substation steps up voltage to a transmission voltage for the grid. The collector substation also can offer energy aspect correction if it's far needed, metering, and manipulate of the wind farm. In a few unique instances a collector substation also can incorporate an HVDC converter station. Collector substations additionally exist in which more than one thermal or hydroelectric energy vegetation of similar output energy are in proximity. Examples for such substations are Brauweiler in Germany and Hradec within side the Czech Republic, in which energy is accrued from close by lignite-fired energy vegetation. If no transformers are required for growing the voltage to transmission degree, the substation is a switching station. Converter substations Converter substations can be related to HVDC converter vegetation, traction modern-day, or interconnected non-synchronous networks. These stations incorporate energy digital gadgets to alternate the frequency of modern-day, in any other case convert from alternating to direct modern-day or the reverse. Formerly rotary converters modified frequency to interconnect structures; in recent times such substations are rare.

Switching station

A switching station is a substation without transformers and working handiest at a unmarried voltage degree. Switching stations are from time to time used as collector and distribution stations. Sometimes they're used for switching the modern-day to back-up strains or for parallelizing circuits in case of failure. An instance is the switching stations for t He HVDC Inga–Shaba transmission line. A switching station can also be called a switchyard, and those are generally placed without delay adjoining to or close by an energy station. In this situation the mills from the energy station deliver their energy into the backyard onto the generator bus on one aspect of the backyard, and the transmission traces take their energy from a Feeder Bus on the opposite aspect of the backyard.

A vital feature carried out via way of means of a substation is switching, that's the connecting and disconnecting of transmission traces or different additives to and from the machine. Switching occasions can be deliberate or unplanned. A transmission line or different factor can also additionally want to be de-energized for protection or for brand spanking new construction, for example, including or eliminating a transmission line or a transformer. To keep reliability of deliver, corporations intention at preserving the machine up and jogging whilst appearing protection. All paintings to be carried out, from habitual trying out to including absolutely new substations, ought to be completed whilst preserving the entire machine jogging. Switchyard at Grand Coulee Dam, United States, 2006 Former excessive-voltage substation in Stuttgart, Germany, now one hundred ten kV switching station. The 220 kV stage is removed for grid simplification. Unplanned switching occasions are as a result of a fault in a transmission line or every other factor, for example: a line is hit via way of means of lightning and develops an arc, a tower is blown down via way of means of excessive wind. The feature of the switching station is to isolate the defective part of the machine within side the shortest feasible time. De-energizing defective gadget protects it from in addition damage, and keeping apart a fault allows maintain the relaxation of the electric grid running with stability.

Railways Main article: Traction substation Electrified railways additionally use substations, frequently distribution substations. In a few instances a conversion of the modern kind takes place, generally with rectifiers for direct modern (DC) trains, or rotary converters for trains the usage of alternating modern (AC) at frequencies apart from that of the general public grid. Sometimes they're additionally transmission substations or collector substations if the railway community additionally operates its very own grid and mills to deliver the opposite stations.

Mobile substation

A cell substation is a substation on wheels, containing a transformer, breakers and bus work installed on a self-contained semi-trailer, supposed to be pulled via way of means of a truck. They are designed to be compact for journey on public roads, and are used for brief backup in instances of herbal catastrophe or war. Mobile substations are generally rated tons decrease than everlasting installations, and can be constructed in numerous gadgets to satisfy street journey limitations.

Q4) What is TSS and ASS?

A4)

Auxiliary Sub-Stations (ASS) 1) All Auxiliary substations will be supplied with 33KV/415 V dry type transformers of required score in redundant configuration conforming to IEC 60076-eleven will be used at RSS, depot, elevated/underground stations and OCC to fulfill auxiliary requirement. 2) Capacity of auxiliary transformers being utilized by BMRCL for numerous locations are as under:

Traction Sub-Stations (TSS)

1) Each Traction Substation receiving strength at 33kV from the 33kV ring feeder. The distance among adjoining TSSs is maintained as in step with the calculation of voltage drops for the duration of device study.

2) The feeding to TSSs is to be with near ring device-i.e. from the respective RSS 33kV feeders to feed exchange TSSs. This association of TSS feeding guarantees that tripping of any breaker because of cable fault will now no longer positioned any of the TSSs out of service.

3) Every TSS will be furnished with Two Switchgear feeders, for loop-in–loop-out of 33kV ring primary feeder, which gives strength to 33kV bus bar. Rectifier/Traction transformers are to be fed from this bus bar.

4) Three Winding (Delta-Star-Delta) Dry Type Traction Transformers of capacity 2850/2600 KVA conforming to IEC 60076-eleven will be furnished.

5) Rectifiers: - 12 pulse or higher with harmonics limits will be used. The responsibility will be class-VI as in step with IEC 60146-1-1 or another equal trendy as adopted

6) The 750V DC is fed to the 0.33 rail device via excessive-velocity circuit breaker (HSCBs) conforming to IEC 61992 and disconnecting switches are incorporated for sectionalizing the 0.33 rail as in step with the operational necessities.

7) DC dis connector will be furnished in DC breakers for higher maintainability.

8) OVPD, over voltage safety tool will be used to save you better voltage of strolling rail to make certain passenger protection as in step with EN 50122-1 or another equal trendy as adopted.

9) Provision of reversible substation for max regenerative strength recovery can be explored. 10) Dry kind transformers for traction deliver for use will be responsibility cycle class VI as in step with EN 50329 in step with the Rectifiers responsibility class.

Third Rail

1) The conductor rails will be synthetic in trendy lengths (normally in 15 mtrs duration pieces) thinking about ease of transportation and installations, which are joined collectively via way of means of unique splice joints.

2) The conductor rail will be synthetic of a excessive conductivity aluminum alloy frame designed for the specified nominal modern-day and applied with a stainless-steel carrying face. The stainless-steel will be joined to the aluminum frame via way of means of a molecular / co-extrusion procedure or via way of means of an exchange verified layout assembly the required necessities and parameters. The chrome steel strip of required thickness shall have flat floor without milling groove. No welding in the cantilever of conductor rail head will be authorized and it ought to be of minimal layout existence of 30 years.

3) The procedure used for the composition of conductor rail shall ideally make certain no gaps stay among the pinnacle of the aluminum phase and the stainless metallic carrying strip. Conductor rail is supposed for use up to finish worn out of stainless-steel with none de lamination of the last chrome steel strip.

Selection of traction voltage

The maximum broadly used voltage degree for Metro Rail traction gadget globally is 750V DC. This gadget has been used within side the metros of UK, New York, Singapore, Paris, Beijing, Kolkata, Bangalore, Dubai etc. Mainly DC traction voltage turned into getting used earlier, however with development in technologies, many metros have followed 25kV AC gadget recently. 25kV AC is utilized in Delhi, Chennai, Jaipur, Hyderabad, Seoul, Paris and Hong Kong. Following unique sorts of Metro Rail traction structures had been applied globally: 600V/750V/825V/900V/1200V/1500V DC 0.33 rail 630V DC 4 rails 600V/750V/1500V/3000V DC Overhead gadget 25kV AC 2 x 25 kV AC 600V AC A web page precise case look at is needed to be accomplished with using simulation software’s for choice of maximum most advantageous voltage degree for the Metro Rail traction gadget. The evaluation covers the max Peak hour height course traffic (PHPDT) that may be catered through a selected traction, price of traction gadget, price of rolling stock, civil infrastructure price etc.

Sub Stations The metro rail distribution community contains of the subsequent sub stations: Receiving Substation (RSS) - The incoming strength deliver is acquired at the primary station that's the start line and referred to as RSS start. There is one greater receiving substation on the remaining station and referred to as RSS cease. The voltage degree of the incoming deliver is typically 66kV, 110kV 132kV or 220kV, however is determined primarily based totally at the close by deliver to be had and its suitability thinking about the entire load of the stations for a given Reach / Corridor (the run of metro among the beginning station and the cease station). The choice of AIS/GIS and its area is accomplished relying upon the gap availability at web page. Power transformers of appropriate score to step down the incoming voltage to 33kV may be supplied within side the RSS for feeding the 33kV switchgear at ASS and additionally for the 33kV deliver required for TSS in case of DC traction. 750/1500V DC

Traction substation (TSS) – Transformers and rectifiers may be supplied within side the TSS to derive 750/1500V DC from 33kV voltage degree. The 33kV deliver may be related in ring community to reap the redundancy required. In case the traction voltage is at 25kV, the incoming voltage degree will be stepped right all the way down to 25kV through definitely rated Single segment transformers placed at TSS. Auxiliary substation (ASS) - The auxiliary substation feeds the auxiliary hundreds of the metro stations like lighting, HVAC, pumps, Lifts etc.

All the auxiliary hundreds of character metro station will be fed through ASS and ASS will be related via ring networks for higher reliability. Traction structures Traction structures typically are of kinds viz – Overhead centenary gadget (OCS) and Third rail gadget Overhead Centenary System (OCS) - It includes a 25 kV conductor going for walks alongside the whole path of the metro. The association of “OCS” is depicted

Reliability and redundancy measures

For imparting uninterrupted offerings, the strength distribution for metro is supplied with good enough redundancies at every stage from supply to load; along with provision of standby device, ring networks etc. Standby generator is furnished in any respect stations to feed crucial masses in case of failure of the ordinary station strength supply Operational Control Centre (OCC) For manage and tracking of the whole metro rail system, a centralized manage middle is furnished as a separate building. All structures of the RSS, TSS and ASS are monitored and managed on the OCC via SCADA. Building Management System is furnished for controlling and tracking of Station MEP Equipment along with Lighting, Lifts, Escalators and HVAC system. Earthling System Mesh type / devoted earthling is furnished at every substation for earthling of device and systems to acquire the step and contact ability inside secure limits and to acquire the general earth resistance as in step with statutory requirements. TCE can provide offerings for grasp making plans and infrastructure works of a metro rail project

Q5) What is Power SCADA?

A5)

Existing RTUs of Siemens make could be included with new SCADA software program over IEC 104 protocol. Existing Software Interlocking Logics, Report technology formats, Events, Alarms and different tracking status, Schematic diagram depiction at HMI of operator and Video Display Unit, Data garage of current machine and different capabilities of current Siemens Spectrum Power Cc SCADA will need to be configured and examined in new SCADA software program. No alternate at RTU, Field equipments, current verbal exchange community and hardware of SCADA machine is envisaged for these paintings. However, if any paintings need to be undertaken for very last commissioning of latest SCADA software program, same will need to be achieved through contractor at its very own value with DMRC approval.

All current switch logics hooked up among BCC and OCC operation and Emulation machine to Main SCADA and education RTUs needs to be accompanied and included in “New Software Installation

Information/Details of current verbal exchange machine, hardware machine and RTU/Relays for which interfacing of SCADA software program required are referred to in Clause no-

Any alternate required all through software program alternate and positioned up in business operation shall need to be achieved through Contractor at its very own value.

Blue Light System for tripping of Traction SCADA below emergency situations needs to be included and kept “Disabled” as according to current requirement.

Contractor has to perform Site Acceptance Test in an effort to certify the machine and shall take approval from DMRC.

Contractor has to combine new SCADA software program capabilities as duplicate of current SCADA software program capabilities in totality. No exception on this regard will be widespread until contractor gives better technical answer than current one and permitted through DMRC. Configuration of RSS SCADA software program of ABB in to current Siemens SCADA exists. New SCADA software program has to combine similar to it is.

For wearing out substitute of software program, Contractor shall need to use the present emulation server/different server and all adjustments will be achieved through Contractor in that Server most effective. This server shall need to function independently with different OCC & BCC servers and equipped for use as Plug in/ Pug out method for checking out in” Non-Revenue” period. All checking out with new SCADA software program will be achieved all through “Non-Revenue period”. During Revenue period, Siemens current software program shall most effective be used.

After certifying all tests, new SCADA software program will be hooked up in Main Server of BCC supplied through DMRC after which overall performance will be noticed. After successful overall performance, Main Servers of OCC supplied through DMRC will be configured and positioned up in operation. Eight Carrying out all of the works referred to above and preserving easy operation manipulate all through Contract is duty of Contractor.

AMC Support Services

1. In case of substitute of SCADA software program for paintings as in step with 2.1 “B”, one certified SCADA engineer will be published at OCC spherical the clock for first month after a hit commissioning of new software program and after that during General obligation at OCC on all days besides Sunday/Holidays for daily DMRC/O&M/TR-AP/SCADA/ETR0102014 Volume-I Technical Package Page 6 of 47 protection and assistance.

2. For OEM beneath scope of labor as in step with 2.1 “A”, one SCADA engineer will be published at OCC in General obligation on all days besides Sunday/Holidays for daily protection and assistance. No spherical the clock engineer for first month is envisaged.

3. Day to day troubles or troubles within side the device will be suggested to the AIRPORT LINE engineer(s) through SMS/Phone/Email/Fax. For all Response time/Rectification time, time of difficulty of SMS/Phone/Email/Fax will be considered. On intimation of any SCADA trouble from DMRC, AIRPORT LINE engineer(s) shall record to OCC as in step with response time stated below. Contractor shall offer Mobile no., Landline Telephone, Fax no. And E Mail Ids for communication.

Maintenance and again up of ancient statistics for later retrieval

Installation of SCADA software program product updates, as launched through the product crew during fore x of Contract.

Restoration of the structures upon its failure and to repair the functioning of the diverse structure. Three days “Operator Training” two times in a year/ every time required. Note: AIRPORT LINE method complete AMC of Traction SCADA software program in conjunction with any hardware component used for substitute of SCADA software program. Following sports are excluded from the scope of AIRPORT LINE- Day to day operations shall now no longer be treated through CAMC engineers.

Maintenance/ rectification of IT hardware besides a part of works described in Scope of labor and telecommunications network/equipments. Maintenance/ rectification of auxiliary structures UPS, Video Display Wall etc. The contractor will broaden and perform preventive protection software and get it accepted from DMRC to make certain that the Entire Traction SCADA (OCC & BCC) is maintained as according to the coolest industry standards. The contractor shall make certain the Traction SCADA is maintained regular with all protection standards, regulatory authority necessities and guarantee a safe, stable and green gadget for all employees who preserve or have get right of entry to it. DMRC purpose for the Traction SCADA is to offer safe, excessive quality, dependable and uninterrupted power deliver to educate operation. In order to perform this purpose, DMRC expects the Contractor to preserve the Traction SCADA as according to the Service degree agreement

Q6) Explain Standby and backup systems?

A6)

The distinction among the three forms of backup electricity is regularly confusing. We will describe the structures here, however it's miles critical to be aware that code officers and different government having jurisdiction can require that sure factors and gadgets be on a machine apart from what we name for here. In the United States, backup electricity structures are ruled through NFPA 110, Standard for Emergency and Standby Power Systems. Emergency Power Systems offer automated backup electricity within side the occasion of ordinary electricity loss. They are required through code and shall offer electricity inside 10 seconds to all lifestyle’s protection structures consisting of egress lighting, smoke evacuation, hearth place alarm structures, elevators, etc. Simply put, something in order to defend the lives of the constructing occupants must be on Emergency Power. Another critical aspect to keep in mind is that emergency electricity structures should be absolutely separate; because of this they shall have their personal conduit runs, their personal panels, their personal switch stations, etc. Legally Required Standby Power Systems additionally offer automated backup electricity within side the occasion of ordinary electricity loss, however they've 60 seconds to engage. They are required through code, however they are able to proportion machine components - they may be now no longer required to be completely separate structures like Emergency Power Systems. These may be concept of as structures that beautify the act of egress and enhance firefighter operations, however aren't essential to lifestyles protection. Systems consisting of heating, ventilation, communications, constructing automation, and health facility gadget can be a part of the Legally Required Standby System.

Optional Standby Power Systems aren't required through code, however will offer backup strength to operations that the constructing proprietor deems critical to hold electrified in the course of everyday strength outages. These structures may be manually or routinely engaged and may percentage the identical additives and wiring as everyday strength or legally required standby strength. In general, Optional Standby Systems are used to save you monetary or records loss, however they also can expand to permitting human consolation in the course of everyday strength outages.

A backup electricity device must be designed to offer power to best the maximum vital portions of device in a building. It isn't always value powerful to have backup electricity to be had for each electric element in a building. Most facilities, even the maximum critical, may be ramped down all through an outage in order that gas or battery electricity may be conserved. As said earlier, existence protection structures are usually required to be on an Emergency Power System. This consists of lights of egress paths, electricity for sprinkler pumps, and electricity to hearth place alarm structures. Hospitals will place existence-saving device, like respirators, on standby electricity. Fire and Police Stations will make certain that their radio structures are on standby electricity so that they can control operations all through emergencies. Homeowners are unfastened to length their standby mills to satisfy their needs. Refrigerators, freezers, and sump pumps are commonly on circuits tied to the backup device, as are lighting all through the domestic. A few comfort stores also are placed on the device to permit telephones to be charged and to maintain a tv or radio operational all through important outages. Fuel garage potential has a tendency to be the restricting aspect for the scale of a domestic generator - you need to have sufficient gas to maintain the device operational thru the outage; therefore, lots of existence's conveniences are grew to become off to preserve gas.

Backup Generators Backup energy is provided with the aid of using a generator, which is largely an engine that burns gasoline to create electricity. The generator may be a reciprocating or a turbine engine, however reciprocating is commonly desired due to the fact they begin up faster and are greater economical. Generator checking out and protection are crucial to the achievement of backup energy systems. Generators and all additives of the gadget must be examined frequently to make sure that they'll be operational while needed. As with any engine, ordinary protection will lengthen the existence and growth the performance of the generator. There are lots of fuels that may be used, which include diesel, gasoline, herbal fuel line and liquid petroleum. Diesel is the maximum not unusual place because of its value and the truth that it's far more secure to shop than gasoline. The gasoline is commonly saved on web website online in a sequence of tanks. A day-tank (now no longer always a complete day of gasoline) is placed close to the generator and affords an instantaneous and regular quantity of gasoline. Large installations can even have a bulk garage tank that can be placed far from the generator. The bulk garage tank holds sufficient gasoline for an extended outage; this gasoline is pumped to the day-tank as needed. Fuel in any garage tank should be continuously used or combined to save you degradation.

An uninterruptible strength supply (UPS) is an electrical tool that gives immediately backup strength to a machine while the ordinary strength supply is going down. The strength from the UPS lasts most effective a quick time, however lengthy sufficient to interact different backup strength re assets or to securely close down a machine. UPS gadgets are typically observed related to laptop structures in which even the slightest blip within side the electric supply ought to motive records loss. UPSs also are used for important structures (healthcare, communications, etc) to offer sufficient operational time to allow the emergency generator ramp as much as complete capacity. There are fundamental alternatives for storing energy in an uninterruptible strength supply: batteries or a fly wheel. The battery machine within reason not unusual place for smaller masses and is produced from one or some of rechargeable batteries. A battery UPS calls for recurring renovation and substitute because the lifespan of a battery within reason quick. A fly wheel UPS machine, additionally referred to as a rotary UPS machine, makes use of a spinning mass to generate energy. Fly wheel structures are typically used for large masses and currents. In addition, fly wheels are favored for his or her lifespan; because of the mechanical nature of the machine, it's going to last as long as 30 years. Maintenance is required, all through which lengthy downtimes may be expected.

Q7) What is Green buildings?

A7)

A ‘inexperienced’ constructing is a constructing that, in its layout, production or operation, reduces or gets rid of poor impacts, and might create effective impacts, on our weather and herbal surroundings. Green homes maintain treasured herbal assets and enhance our first-class of lifestyles. There are some of functions that may make a constructing ‘inexperienced’. These include: Efficient use of energy, water and different assets Use of renewable energy, which include sun energy Pollution and waste discount measures, and the allowing of re-use and recycling Good indoor environmental air first-class Use of substances which might be non-toxic, moral and sustainable Consideration of the surroundings in layout, production and operation Consideration of the first-class of lifestyles of occupants in layout, production and operation

A layout that permits version to a converting surroundings Any constructing may be an inexperienced constructing, whether or not it’s a home, an office, a school, a hospital, a network centre, or some other sort of structure, furnished it consists of functions indexed above. However, it's miles really well worth noting that now no longer all inexperienced homes are – and want to be - the same. Different nations and areas have lots of traits which include extraordinary climatic conditions, specific cultures and traditions, numerous constructing kinds and ages, or wide-ranging environmental, financial and social priorities – all of which form their method to inexperienced constructing.

This is why World GBC helps its member Green Building Councils and their member businesses in man or woman nations and throughout areas, to pursue inexperienced homes which might be high-satisfactory acceptable to their very own markets. To get concerned on your very own country’s transformation to inexperienced constructing, please touch or be part of your neighborhood Green Building Council.

Green constructing (additionally referred to as inexperienced production or sustainable constructing) refers to each a shape and the software of tactics which can be environmentally accountable and resource-green for the duration of a construction’s life-cycle: from making plans to layout, production, operation, protection, renovation, and demolition.

This calls for near cooperation of the contractor, the architects, the engineers, and the customer in any respect task stages.

The Green Building exercise expands and enhances the classical constructing layout issues of economy, utility, durability, and comfort.

In doing so, the 3 dimensions of sustainability, i.e., planet, humans and income throughout the whole deliver chain want to be considered

Leadership in Energy and Environmental Design (LEED) is a fixed of score structures for the layout, production, operation, and protection of inexperienced homes which changed into advanced via way of means of the U.S.

Green Building Council. Other certificates structures that affirm the sustainability of homes are the British BREEAM (Building Research Establishment Environmental Assessment Method) for homes and large-scale tendencies or the DGNB System (Deutsche Gesellschaft für Nachhaltiges Bauer which benchmarks the sustainability overall performance of homes, indoor environments and districts. Currently, the World Green Building Council is undertaking studies at the consequences of inexperienced homes at the fitness and productiveness in their customers and is operating with the World Bank to sell Green Buildings in Emerging Markets via EDGE (Excellence in Design for Greater Efficiencies) Market Transformation Program and certification.

There also are different equipment together with Green Star in Australia, Global Sustainability Assessment System (GSAS) used within side the Middle East and the Green Building Index (GBI) predominantly utilized in Malaysia. Building statistics modeling (BIM) is a manner regarding the era and control of virtual representations of bodily and purposeful traits of places. Building statistics models (BIMs) are files (regularly however now no longer usually in proprietary codes and containing proprietary data) which may be extracted, exchanged or networked to guide decision-making concerning a constructing or different constructed asset. Current BIM software program is utilized by individuals, companies and authorities organizations who plan, layout, construct, function and preserve various bodily infrastructures, together with water, refuse, electricity, gas, conversation utilities, roads, railways, bridges, ports, and tunnels. Although new technology are continuously being advanced to supplement contemporary practices in developing greener structures, the not unusual place goal of inexperienced homes is to lessen the general effect of the constructed surroundings on human fitness and the herbal surroundings via way of means of: Efficiently the usage of power, water, and different resources Protecting occupant fitness and enhancing worker productiveness (see healthful constructing) Reducing waste, pollutants and environmental degradation

A comparable idea is herbal constructing, that is generally on a smaller scale and has a tendency to recognition on the usage of herbal substances which can be to be had locally.

Other associated subjects consist of sustainable layout and inexperienced architecture. Sustainability can be described as assembly the wishes of gift generations without compromising the cap potential of destiny generations to satisfy their wishes.

Although a few inexperienced constructing applications do not cope with the difficulty of retrofitting current homes, others do, particularly via public schemes for power green refurbishment. Green production standards can without difficulty be implemented to retrofit paintings in addition to new production. A 2009 record via way of means of the U.S. General Services Administration discovered 12 sustainably-designed homes that value much less to function and feature great power overall performance. In addition, occupants have been average extra happy with the constructing than the ones in normal industrial homes. These are green homes

The inexperienced constructing motion within side the U.S. Originated from the want and choice for greater strength green and environmentally pleasant creation practices. There are some of reasons for constructing inexperienced, which include environmental, economic, and social benefits However, present day sustainability projects name for an incorporated and synergistic layout to each new creation and within side the retrofitting of present structures. Also referred to as sustainable layout, this technique integrates the constructing life-cycle with every inexperienced exercise hired with a layout-cause to create a synergy some of the practices used. Green constructing brings collectively a tremendous array of practices, strategies, and abilities to lessen and in the end cast off the affects of homes at the surroundings and human health. It regularly emphasizes taking gain of renewable sources, e.g., the usage of daylight thru passive solar, lively solar, and photovoltaic equipment, and the usage of vegetation and bushes thru inexperienced roofs, rain gardens, and discount of rainwater run-off. Many different strategies are used, which include the usage of low-effect constructing substances or the usage of packed gravel or permeable concrete in place of traditional concrete or asphalt to beautify replenishment of groundwater.

While the practices or technology hired in inexperienced constructing are continuously evolving and might vary from place to place, essential standards persist from which the technique is derived: sitting and shape layout efficiency, strength efficiency, water efficiency, substances efficiency, indoor environmental first-rate enhancement, operations and preservation optimization and waste and toxics discount. The essence of inexperienced constructing is an optimization of 1 or greater of those standards. Also, with the right synergistic layout, person inexperienced constructing technology may fit collectively to provide a extra cumulative effect. On the classy aspect of inexperienced structure or sustainable layout is the philosophy of designing a constructing this is in concord with the herbal functions and sources surrounding the web website online. There are numerous key steps in designing sustainable homes: specify 'inexperienced' constructing substances from nearby sources, lessen loads, optimize systems, and generate on- website online renewable strength.

Q8) What is Carbon credits and clear air mechanics?

A8)

A carbon credit score is a allow that permits the agency that holds it to emit a sure quantity of carbon dioxide or different greenhouse gases. One credit score allows the emission of a mass identical to 1 ton of carbon dioxide. The carbon credit score is one 1/2 of a so-called "cap-and-alternate" program. Companies that pollute are offered credit that permits them to retain to pollute as much as a sure restrict. That restrict is decreased periodically. Meanwhile, the agency might also additionally promote any unneeded credit to any other agency that desires them. Private organizations are for that reason doubly incentivized to lessen greenhouse emissions. First, they'll be fined in the event that they exceed the cap. Second, they are able to make cash with the aid of using saving and reselling a number of their emissions allowances. Understanding a Carbon Credit The remaining intention of carbon credit is to lessen the emission of greenhouse gases into the atmosphere.

Carbon credit have been devised as a market-orientated mechanism to lessen greenhouse fuel line emissions. Companies get a fixed range of credit, which decline over time. They can promote any extra to any other agency. Thus, "cap-and-alternate" is an incentive to lessen emissions. As noted, a carbon credit score is identical to 1 ton of carbon dioxide. According to the Environmental Defense Fund, this is the equal of a 2,400-mile power in phrases of carbon dioxide emissions.1 Companies or countries are allocated a sure range of credit and can alternate them to assist stability overall international emissions. "Since carbon dioxide is the predominant greenhouse fuel line," the United Nations notes, "human beings talk really of buying and selling in carbon."

The goal is to lessen the range of credit over time, for that reason incentivizing organizations to locate progressive approaches to lessen greenhouse fuel line emissions.

The Clean Development Mechanism (CDM) is a United Nations-run carbon offset scheme permitting nations to fund greenhouse fuel line emissions-lowering tasks in different nations and declare the stored emissions as a part of their very own efforts to satisfy worldwide emissions targets. It is one of the 3 Flexible Mechanisms described within side the Kyoto Protocol. The CDM, described in Article 12 of the Protocol, became meant to satisfy objectives:

(1) to help non-Annex I nations (predominantly growing nations) acquire sustainable improvement and decrease their carbon footprints

(2) to help Annex I nations (predominantly industrialized nations) in attaining compliance with their emissions discount commitments (greenhouse fuel line emission caps).

The CDM addressed the second one goal via way of means of permitting the Annex I nations to satisfy a part of their emission discount commitments beneath the Kyoto Protocol via way of means of shopping for Certified Emission Reduction devices from CDM emission discount tasks in growing nations (Carbon Trust, 2009, p. 14)

Both the tasks and the difficulty of CERs devices are challenge to approval to make sure that those emission discounts are actual and "additional." The CDM is supervised via way of means of the CDM Executive Board (CDM EB) beneath the steerage of the Conference of the Parties (COP/MOP) of the United Nations Framework Convention on Climate Change (UNFCCC). Certified Emission Reduction devices (CERs) are issued for a hi tasks, which can be traded in emissions buying and selling schemes.

The easy improvement mechanism is one in every of the "flexibility mechanisms" described within side the Kyoto Protocol. The flexibility mechanisms have been designed to permit Annex B international locations to fulfill their emission discount commitments with decreased effect on their economies (IPCC, 2007).

The flexibility mechanisms have been delivered into the Kyoto Protocol with the aid of using the United States government. Developing international locations have been exceptionally skeptical and fiercely against the ability mechanisms (Carbon Trust, 2009, p. 6).

However, the global negotiations over the follow-as much as the Kyoto Protocol agreed that the mechanisms will continue. There have been predominant worries approximately the layout of the CDM (Carbon Trust, 2009, pp. 14–15). One became over the additionality of emission discounts produced with the aid of using the CDM. The different became whether or not it'd permit wealthy international locations and businesses to impose tasks that have been opposite to the improvement pursuits of host international locations. To alleviate this concern, the CDM calls for host international locations to verify that CDM tasks make contributions to their very own sustainable improvement. International policies additionally restrict credit for a few forms of activities, considerably nuclear strength and averted deforestation. The CDM best won momentum in 2005 whilst the Kyoto Protocol took effect. The preliminary years of operation yielded fewer CDM credit than was hoping for, which became partly ascribed to the underfunded and understaffed oversight bodies.

The reason of the CDM is to sell easy improvement in growing nations, i.e., the "non-Annex I" nations (nations that are not indexed in Annex I of the Framework Convention). The CDM is one of the Protocol's "challenge-primarily based totally" mechanisms, in that the CDM is designed to sell tasks that lessen emissions. The CDM is primarily based totally at the concept of emission reduction "production" (Toth et al., 2001, p. 660)

These discounts are "produced" after which subtracted towards a hypothetical "baseline" of emissions. The baseline emissions are the emissions which are anticipated to arise within side the absence of a specific CDM challenge. CDM tasks are "credited" towards this baseline, within side the feel that growing nations benefit credit score for generating those emission cuts. The financial foundation for inclusive of growing nations in efforts to lessen emissions is that emission cuts are concept to be much less steeply-priced in growing nations than advanced nations (Gold emberg et al., 1996, p. 30 Grubb, 2003, p. 159)

For example, in growing nations, environmental law is usually weaker than it's miles in advanced nations (Sashayed et al., 2001, p. 387-389).

Thus, it's miles extensively concept that there's more capability for growing nations to lessen their emissions than advanced nations. Emissions from growing nations are projected to growth considerably over this century (Gold emberg et al., 1996, p. 29)

Infrastructure choices made in growing nations should consequently have a completely massive affect on destiny efforts to restriction overall international emissions (Fisher et al., 2007).

The CDM is designed to begin growing nations off on a route in the direction of much less pollution, with industrialized (Annex B) nations buying the discounts. To save you industrialized nations from making limitless use of CDM, the framework has a provision that use of CDM be supplemental to home movements to lessen emissions. The Adaptation Fund turned into hooked up to finance concrete variation tasks and programmers in growing nations which are events to the Kyoto Protocol.

The Fund is to be financed with a percentage of proceeds from easy improvement mechanism (CDM) challenge sports and acquire finances from different sources.