Uttar pradesh power corporation limited

UTTAR PRADESH POWER TRANSMISSION

CORPORATION LIMITED(132KV Sub Station

Dasna )

VIKAS RAGHUVANSHI (1402721916)

EN-4th year

CONTENTDescription of 132KV substation DASNASingle line diagram of UPPCL, DASNA

(132KV)Main equipment at DASNA substation

132KVLightning ArresterCapacitor Voltage transformerIsolatorCircuit breakerTransformersSome important components References

DISCRIPTION OF 132KV SUBSTATION DASNAThe 132KVpower substation has

the capacity of (2*40 MVA+ 1*20MVA).

It receives two 132 KV lines from Muradnagar (circuit 1) and Gulaothi (circuit2).

It step down this supply to 33KV . It gives supply to Coca cola, Mother Dairy, Rama Hospital and other feeder.

Capacitor bank is connected to main bus of 33KV. It is provided to improve power factor & voltage profile. Capacitor Bank comprises of two units of 10 MVAR making total capacity of 20 MVAR.

 Power Bank:- 54 cell is series connected. Each cell 2V.,300AH total capacity=108V.

132kV Substation It is devided into two(2) parts:-

A. Panel SectionA. Control Panel SectionB. Relay and Protection Panel Section

B. Switch YardA. 132kV sectionB. 33kV section

C. Battery Room (Extra)

A. Panel SectionIt is a room which contains all types of

panels. It has two sections:-

Control Panel SectionIt contain panels related to controlling of instruments. E.g.:- feeder panel, Apex panel, etc.

Relay And Protection Panel SectionIt contains panels related to relay systems and protection systems. E.g.:- Relay panel, line protection panel, etc.

B. Switch YardIt is the field where components used

in controlling supply and measuring supply(incoming and outgoing) are placed.

Some of these many components are:- C.Bs Isolators C.Ts P.Ts L.As etc.

MAIN EQUIPMENT AT DASNA SUBSTATION 132KV

SINGLE LINE DIAGRAM

The line moves ahead passing through insulators & to the circuit breakers (CB) moving ahead to the main bus bar

line moves through Capacitive Voltage Transformer (CVT) & Current Transformer (CT) Capacitive

Voltage Transformer(CVT)

Current Transformer(CT)

132KV SF6 CB

LIGHTNING ARRESTERS

A lightning arrester is a device used on electrical power system to protect the insulation and conductor of the system from the damping effect of lightning.

The lightning arresters has a high voltage terminal and a ground terminal.

When a lightning surge travels along the power line to the arrester, the current from the surge is diverted through the arrester, in most cases to earth.

CAPACITOR VOLTAGE TRANSFORMERA capacitor voltage transformer(CVT) or

capacitance coupled voltage transformer(CCVT) is a transformer used in power system to step down extra high voltage signals and provide a low voltage signal, for measurement or to operate a protective relay.

In its most basic form the device consists of three parts– two capacitors across which the transmission line signals is splits, and one inductive element to tune the device to the line frequency, and a transformer to isolate and further step down the voltage for the instrumentation or protective relay.

ISOLATERIn electrical engineering, a

disconnector, disconnect switch or isolator switch is used to ensure that an electrical circuit is completely de-energized for service or maintenance.

STEPS OF OPERATION OF ISOLATORSEQUENCE OF STEPS FOR ATTENDING

MAINTAINANCE—1. Open CB on no load or full load2. Open the isolator on no load3. Close the earth switchEQUENCE OF STEPS FOR KEPT IN

SERVICE—4. Open the earth switch5. Close the isolator6. Close the CB

CIRCUIT BREAKER A CB is an automatically operated electrical

switch designed to protect an electrical circuit from damage caused by overcurrent or overload or short circuit.

Its basic function is to interrupt current flow after protective relays detect a fault. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.

Whenever a fault occur trip coil gets energised, the moving contact are pulled by some mechanism and therefore the circuit is opened.

TYPES OF CB

TRANSFORMERSPOWER TRANSFORMERS Transformer is a static machine, which

transforms the potential of alternating current at same frequency.

It means the transformer transforms the low voltage into high voltage and vice versa.

It works on the principle of mutual inductance.

When the energy is transformed to a higher voltage ,the transformer is called step up and if energy transformed to a lower volt, the transformer is called step down.

TWO 10MVAR CAPACITOR BANKS(20 MVAR) FOR POWER FACTOR CORRECTION & VOLTAGE STABILITY FOR DISTRIBUTION

Capacitor Cells

SOME IMPORTANT COMPONENTSEARTH SWITCH:- it is a switch normally

kept open and connected b/w earth and conductor. If the switch is closed ,it discharges the electric charge to ground, available on the uncharged line.

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 alluminium, with very low impedance and high current carrying capacity.

CURRENT TRANSFORMER(CT):-the lines in the substations carry currents in the order of thousands of amperes.The measuring instruments are designed for low value of currents. CT are connected in lines to supply measuring instruments and protective relays.

INSULATORS:- they supports the conductor(bus bar) and confine the current to the conductor. The most commonly used material for manufactures of insulators is porcelain. There are several type of insulator (i.e. pin type, suspension type, strain type etc.) and there used in substation will depend upon the service requirement.

POTENTIAL TRANSFORMERS(PTs):-The lines in the substations operate at high voltage. The measuring instruments are designed for low voltages. PTs are connected in lines to supply measuring instruments and protective relays. These transformers make the low voltage instruments suitable for measurement of high voltages.

Important TermsTripping – Power goes due to over load . It is

for the protection of components.Shut down – Power is cut due to maintenance

in progress. It is done manually.Break down – Power goes due to any fault in

the line. When fault is removed , power is back.

Rosting – Power is cut deliberately on order of higher authority due to shortage of power.

REFERENCEMinistry of Power, Govt. of India.www.wikepedia.comhttp://upptcl.org/index.htmwww.home-energy-metering.comwww.nic.in.

THANKS