The project work assigned to us was to /33 KV EHV substation - electrical design. The power from kV substation single line diagram. Starting from. Training Report on to KV Substation - Free download as PDF File .pdf), ΓΌ Single line diagram (SLD) Site Selection & Layout KV Substation: . One Line Diagram of Kv Grid Station Khanewal {01} - Free download as Word Doc .doc), isolator, circuit breaker, earth isolator and potential transformer.

Single Line Diagram 132 Kv Substation Pdf Download

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SINGLE LINE DIAGRAM OF /33 KV GRID SUB - STATION BETTIAH. KV Transfer Bus. KV Main Bus. 33 KV Main Bus. 20 MVA. ABB Make. Tr. No. Single Line Diagram of Substations Substations Electric power is produced at . iii) Bus-bars: kV-Double bus, 66kV-Double bus, 11kV bus iv) Transformers. Basically, Sub-station consists of power transformers, circuit breakers, relays, isolators, earthing switches, constructional features 4 3 SINGLE LINE DIAGRAM 6 Feeder Circuit 6 Transformer Circuit 6 Construction of the substation 5 Single line dig of a /kv substation 7 (i) Surge Download pdf.

Circuit breaker CB : Circuit breakers are used for opening or closing a circuit under normal as well as abnormal faulty conditions. Different types of CBs which are generally used are oil circuit breaker, air-blast circuit breaker, vacuum circuit breaker and SF6 circuit breaker. Isolators or Isolating switches: Isolators are employed in substations to isolate a part of the system for general maintenance.

Isolator switches are operated only under no load condition. They are provided on each side of every circuit breaker. Lightning arresters LA : Lightning arresters are the protective devices used for protection of equipment from lightning strokes. They are located at the starting of the substation and also provided near the transformer terminals.

Earth switch: It is a switch normally kept open and connected between earth and conductor. If the switch is closed it discharges the electric charge to ground, available on the uncharged line.

Wave trap: This equipment is installed in the substation for trapping the high frequency communication signals sent on the line from remote substation and diverting them to the telecom panel in the substation control room.

Coupling capacitor: A coupling capacitor is used in substations where communication is done by AC power line. It offers very low impedance to high frequency carrier signal and allows them to enter the line matching unit and blocks the low frequency signal. Bus-bar: When number of lines operating at the same voltage levels needs to be connected electrically, bus-bars are used. Bus-bars are conductors made of copper or aluminum, with very low impedance and high current carrying capacity.

Single bus-bar arrangement: It consists of single bus-bar. Both incoming and outgoing lines are connected to the single bus-bar.

The advantages of this arrangement are low maintenance, low initial cost and simple operation. The drawback of this arrangement is if any repair work is to be done on bus-bar, complete system get interrupted. Figure below shows that three incoming and three outgoing line are connected to the single bus arrangement. Single bus-bar with sectionalisation: Single bus-bar is divided into sections. All joints in steel earthing system should be made by welding except the points for separating the earthing mat for testing purposes which should be bolted.

These points should be accessible and frequently supervised. In its most basic form the device consists of three parts: two capacitors across which the voltage signal is split, an inductive element used to tune the device and a transformer used to isolate and further step-down the voltage. The device has at least four terminals, a high-voltage terminal for connection to the high voltage signal, a ground terminal and at least one set of secondary terminals for connection to the instrumentation or protective relay.

CVTs are typically single-phase devices used for measuring voltages in excess of one hundred KV where the use of voltage transformers would be uneconomical. In practice the first capacitor, C1, is often replaced by a stack of capacitors connected in series. This results in a large voltage drop across the stack of capacitors, that replaced the first capacitor and a comparatively small voltage drop across the second capacitor, C2, and hence the secondary terminals.

The function of this wave trap is that it traps the unwanted waves. Its shape is like a drum. It is connected to the main incoming feeder so that it can trap the waves which may be dangerous to the instruments in the substation. Generally it is used to exclude unwanted frequency components, such as noise or other interference, of a wave. Note: Traps are usually unable to permit selection of unwanted or interfering signals. This is relevant in Power Line Carrier Communication PLCC systems for communication among various substations without dependence on the telecom company network.

The signals are primarily tele protection signals and in addition, voice and data communication signals. The Line trap offers high impedance to the high frequency communication signals thus obstructs the flow of these signals in to the substation bus bars.

Either line equipment, power transformer equipment or power transformer. With the isolators, we are able to see the isolation of the equipment with our naked eye.

The line isolators are used to isolate the high voltage from flow through the line into the bus. This isolator prevents the instruments to get damaged. It also allows the only needed voltage and rest is earthed by itself.

132/33 KV EHV substation

Isolator is a type of switching device. It has non control devices. Isolator are operated after the circuit breaker is opened. While closing the circuit, first close the isolator and after the circuit breaker is closed. Strictly speaking Isolators are operated under no current condition.

In the following cases it is permissible to use isolator for making and breaking of the circuits. Air break isolators or disconnecting switches are not intended to break load though these are meant for transfer of load from one bus to another and also to isolate equipment for maintenance.

These are available mainly in two types vertical break type and horizontal break type. The later type requires larger width. However the space requirement can be reduced in the horizontal break isolators by having double break with a centre rotating pillar.

Under the guidance of

Pantograph and semi-pantograph disconnects involve vertical movements of contact arm and therefore require less separation between phases and thereby require less separation between phases and thereby help in reducing the sub-station area to a larger extent. The isolators could be operated mechanically or hydraulically or pneumatically or by electric motor.

Earthing facility shall be provided wherever required. Basic Function of Instrument Transformers: 17 Direct measurement of current or voltage in high voltage system is not possible because of high values and insulation problems of measuring instruments they cannot be directly used for protection purposes. D I These are of two types: N G 1. Single turn primary winding 2. Design of a current transformer depends on the frequency of excitation. Primary to earth and primary to secondary cores are to be checked with 5KV motor operated insulation tester megger and secondary to earth values are to be checked with V insulation tester or preferably with V insulation tester.

Core 1 is generally for Over current and earth fault protection. Core 2 is for metering. Usage of core is decided by the accuracy class of the CT.

One Line Diagram Of 132 Kv Grid Station Khanewal

Core material decides the accuracy class Core with accuracy class 1. This indicates that 0. In 5p10, the 5 denotes allowable errors i. CT with 4 cores protection, special protection, special protection and metering is used for KV Bus couplers for the twin bus substations.

At the rate of KV level we should use cores Current transformer. The specifications of LVCT are given below: 4.

Ldyn : NOTE:-Loose connections should not be allowed in the electrical circuit. It increases the contact resistance which in turn the rises the temperature in that area due to load current.

Entry of moisture in to the VCB insulator chamber cause vacuum interrupter failure and pull rod failure due to electrical break down.

Hence loose connections should not be allowed. It must always be connected in parallel only. Even if we connect it directly from high voltage to earth, it is not going to be a short circuit as its primary winding has very high resistance.

Its core is a set of assembled laminations. It operates at constant flux density. These values are to be checked with V insulation tester megger or preferably with V insulation tester. This is approximately equal to voltage applied in the primary winding or voltage ratio of the PT. Generally in 11KV or 33KV bus PTs, there is one secondary winding which is used both for protection and metering and in KV and above, there are two secondary cores.

First core is of metering core with 1. This will be used metering, directional over current protection and distance protection. The second core is protection core with 3P accuracy class. This will be used for the directional earth fault protection open delta voltage of power transformers and KV feeders. Accuracy class 0. Permissible load to be connected on PT secondary winding is decided by the burden of the PT secondary winding.

Electrical substation

It is expressed in volt-amperes VA. If more than rated burden is connected then error will be increased. These circuit breaker breaks for a fault which can damage other instrument in the station. For any unwanted fault over the station we need to break the line current. This is only done automatically by the circuit breaker.

These are load switches. It is able to make or break the normal load current as well as the fault currents. The basic construction of any circuit breaker requires the separation of contacts in an insulating fluid, which serves two functions. It extinguishes the arc drawn between contacts when the CB opens and it provides adequate insulation between the contacts and from each contact to earth.

For successful operation of the circuit breaker, two functions are to be performed. Vacuum integrity test is the correct test to know the healthiness of the vacuum interrupter.

Training Report on 220 to 132KV Substation

If it is reaching to SF6 gas pressure low alarm stage, it is to be brought to the notice of the maintenance personnel. Oil condition in the air compressor is to be checked periodically.

And it is to be replaced based on condition of oil. There are mainly two types of circuit breakers used for any substations. They are a SF6 circuit breakers; b Vacuum circuit breakers.

SF6 is now being widely used in electrical equipment like high voltage metal enclosed cables; high voltage metal clad switchgear, capacitors, circuit breakers, current transformers, bushings, etc. The gas is liquefied at certain low temperature, liquidification temperature increases with the pressure.

Sulphur hexafluoride gas is prepared by burning coarsely crushed roll sulphur in the fluorine gas, in a steel box, provided with staggered horizontal shelves, each bearing about 4 kg of sulphur. The steel box is made gas tight. The gas is put inside the circuit breaker by force i.

When if the gas gets decreases there is a motor connected to the circuit breaker. The motor starts operating if the gas went lower than There is a meter connected to the breaker so that it can be manually seen if the gas goes low. The circuit breaker uses the SF6 gas to reduce the torque produce in it due to any fault in the line. The circuit breaker has a direct link with the instruments in the station, when any fault occur alarm bell rings.

They are only used in low distribution side. It is to be ensured at regular intervals at least once shift, as there is no trip circuit supervision relay and annunciation relay for 33KV feeders and in case of old panels of KV feeders If any deviation is found it is to be brought to the notice of maintenance personnel. The first bus is used for putting the incoming feeders in la single line. There may be double line in the bus so that if any fault occurs in the one the other can still have the current and the supply will not stop.

The two lines in the bus are separated by a little distance by a conductor having a connector between them.

This is so that one can work at a time and the other works only if the first is having any fault. When the power house start then provided the supply, so these lines will be used for incoming. When used for incoming then these lines provides the supply to kv busbar from two grid stations.

Whenever one or both grid stations that connected with multan and kabirwala lines needs the supply from khanewal grid station then these lines are used for outgoing to maintain the voltage at these grid station.

The kv busbar of khanewal gets supply other lines and provides to these lines these too lines has equal quantity of protection equipment. The incoming and out going procedure is like multan and kabirwala lines. The equipment that are used for protection of these lines. These lines have equal equipment to multan and kabirwala. The power houses are also synchronise with each other. So if load of one of these increases then the substation gets supply to other substation with respect to requirement.

B and C. Isolators used on no-load condition, circuit breakers are used for normal condition, CT and PT are used for purpose of reading of voltage and current with meter, lightning arresters are used to arrest the lightning.

Electrolyte for battery is hydro sulfuric acid H2SO4. There is a compound used for grid. There is a layer of PbO2 is also use for surfing on grid. After charging Pbo2 change in acto material. Normally one more then positive plate.Current transformer 6. The central component of the substation is the transformer, as it provides the effective in enface between the high- and low-voltage parts of the system.

Oil Piping. The circuit breaker has a direct link with the instruments in the station, when any fault occur alarm bell rings. Welded surfaces should be painted with red lead and aluminium paint in turn and afterwards coated with bitumen. It also allows the only needed voltage and rest is earthed by itself. Thus an isolator is used after the bus also for protection.

There is emf produced between these plates and cell will be charged.

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