Substation visit

At HADALA 400 kv

By: NIDHI MARU

AKASH THAKAR

SUBSTATION:

A substation is a part of an electricalgeneration, transmission,

and distribution system. Substations transform voltage from high to low, or the

reverse, or perform any of several other important functions.

SITE

At hadala ,14 km from MEFGI.

400 kv input line (double busbar) and 220kv (output)

Connected in ring main system of hadala – amreli – varsana

Has been Established in 2007

Incoming line from generating station (adani(95),varasana(161),essar-

vadinar(282,287) )

Outgoing line from HADALA substation (chorania(146),amreli(245))

Busbar system

Double busbar in incoming line and one extra transfer bus is being used .

Fully numerical protection to all the line.

Transfer bus can serve only in replace to one bus bar

Components

At incoming line

1. Wave trap

2. Cvt (capacitive voltage transformer )

3. Reactor (100mvar ),(for ferrenty effect)

4. Lightning arrester (ring type structure can be use at the time of lightning )

It has property of low resistance path during high voltage

ZNO2 material is used (normally solid state)

5. Central bus isolator

6. C.B.(SF6)

Transformer (315 mva )

Protection system – world class

Operating time of c.b. 80 msec

Fault detection time 30 msec

LBB protection was used if the line c.b. fails to operated (as a backup proctection)

Autorecloser at outgoing line (one try only)

Control room

Control panels for detection of current voltage reactive and real power

Relay room was inside the control room

Relay room has DAS(DATA AQUISATION SYSTEM) system

Battery room

Battery room for the powering all the numerical relays and control room

operation

Two system of battery – 1. 50v 1000AH (each cell 2v)

2. 220v (for all the auxillary)

BATTERY ROOM

SUBSTATION DESIGN

SUBSTATION

GROUNDING GRID