SHANTI INSTITUTE OF TECHNOLOGY

PresentationOn

Vocational Training(Session 8july-19aug)

Topic:- 132KV/33KV Sub-Station

SUBSTATION Substation:- Substation is an intermediate switching, transforming or converting station between the generating station and the low tension distribution network situated generally the consumer’s load centre.

Function of the substation:- The sub-station receives power from the generating station by a single or more feeders at a high voltage, transform the same to the different distribution voltages and sends to different consumers through distribution network.

)BIHAR STATE POWER AND TRANSMISSION COMPANY LTD

(BPHCL)

Single Line Diagram:-

TR

AN

SFO

RM

ER

:A transformer is a static piece of apparatus by means of which electric power in one circuit is transformed into electric power of the same frequency in another circuit.

Specification of Transformer : -

Continuous rating MVA = 32/40Numbers of unit = Two(2 nos)Phase = 50HzFrequency = 132/33 kvNormal voltage ratio at no load = Star/Delta Connections = ᵞ nynoVector group = +5% to 15% of132 KV in 1.25% stepTapping range = Type – SN /50012/350/300/16-

0CRT maleDetails of C.T. = (1) H.V. WTI C.T. single core ring type,

10VA ratio 205.8/1.8 class-5, fitted inside HV bushing current in 2V terminals. (2) L.V. WTI C.T. single core ring type 10VA Ratio:- 6.99/1.8 amps class-5, fitted inside L.V. bushing current in 2V terminal.

Cooling = ONAN/ONAFTerminal arrangement = (1) H.V. 145KV/1250

amps, 650 BIL 300 BCT OIP condenser bushing with arching hours. Coverage

distance:- 1300mm. (2) L.V. 52KV/1250 amps,

250 BIL 100 BCI OIP condensers bushing with arching hours. Creep age distance: - 1300.

(3) H.V. ‘N’ & L.V. ‘N’ 52KV/1250 amps 250BIL , 100 BCT OIP condenser bushing without arching

hours. Creep age distance:- 1300mm.

Total weight of transformer = 73500KgWeight/quantity of oil =

15000Kg/16900 liters (for first filling)Untangling weight = 41000Kg

(core & winding with cover)Transport weight = 50000Kg (gas

filled)

CURRENT TRANSFORMER

Current transformers are used for reducing or stepping down A.C. current from higher value to lower for measurement protection or control

Types of Current Transformer:

1. Ring type C.T. or window type C.T2. Mounted Resin C.T

VOLTAGE TRANSFORMER

Voltage transformers are used for protection and measurement. Accordingly they are either measuring type or protective type voltage transformers. They may be either single or three phases. The primary of voltage transformer is connected directly to power circuit between phase and ground depending upon rated voltage and application.

Pow

er Tra

nsfo

rmer

Transformer is a static electromagnetic machine which transforms alternating current from one A.C. voltage at same frequency & at the same apparent power from one winding via common magnetic core.

Use And Application of Power Transformer:

GENERATIONTRANSMISSIONDISTRIBUTIONRECTIFIER PLANTS

CIR

CU

IT B

REA

KER

:It is an automatic device capable of making and breaking an electric circuit under normal & abnormal condition such as short circuit.

TYPES OF CIRCUIT BREAKER:

1. Air circuit-breaker miniature circuit breaker (ACB).

2. Oil circuit-breaker tank type or bulk oil (OCB).

3. Minimum oil circuit-breaker (MOCB).4. Air blast circuit-breaker (ABCB).5. Sulfur hexafluoride circuit-breaker (single

pressure or double pressure).6. Vacuum circuit-breaker (VCB).

Relay:

A relay is an electrically operated switch. Relays are used where it is necessary to control a circuit by a low-power signal or where several circuits must be controlled by one signal. Relays were used extensively in telephone exchanges and early computers to perform logical operations

Isolator• Isolator can be rewritten

as isolator is a manually operated mechanical switch which separates a part of the electrical power system normally at off load condition.

Lightning Arrester• A lightning arrester is

placed where wires enter a structure, preventing damage to electronic instruments within and ensuring the safety of individuals near them. Lightning arresters, also called surge protector.

Wave Trap• It is used to trapping the

high frequency communication signals sent on the line from the remote substation and diverting them to the telecom/teleprotection panel in the substation control room. Line trap also is known as Wave trap

MITHILESH KUMAR EE 6th Sem (SIT)

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