15-10-2012, 01:01 PM
220 KV GRID SUBSTATION ALWAR
220 KV GRID SUBSTATION.doc (Size: 660.5 KB / Downloads: 131)
ABSTRUCT
A substation is an assembly of apparatus, which transform the characteristics of electrical energy from one form to another say from one voltage level to another level. Hence a substation is an intermediate link between the generating station and the load units
there are four bus bars in 132kv yard and five bus-bars in 220kv yard. the incoming feeders are connected to bus-bar through lighting arrestors, capacitive voltage transformer ,line isolator, circuit breakers current-transformers, line isolator etc. The bus-bars are to have an arrangement of auxiliary bus.
In the 220KV GSS the income 220KV supply is stepped down to 132Kv with the help of transformers which is furthers supplied to different sub-station according to the load.220Kv G.S.S. has a large layout consisting of 3 Nos. of 100MVA transformers, with their voltage ratio respectively 220/132Kv in addition to these transformers. There are many other equipment’s are also installed in220 KV yards
At "GSS ALWAR" the separate control room switches and fuses. There are meters for reading purpose. A circuit concerning the panel is shown on the panel with standard co lour.provided for remote protection of 220KV switch yards transformer incoming feeder, outing feeders. Bus bar has their own control plant in their control rooms. The control panel carrier the appropriate relays. Necessary meters indicating lamp control.
INTRODUCTION
AN OVERVIEW OF R.S.E.B.
“Rajasthan State Electricity Board” started working form 1 July, 1957. When India becomes independent its overall installed capacity was hardly 1900 mw. During first year plan (1951-1956) this capacity was only 2300 mw. The contribution of Rajasthan state was negligible during 1&2 year plans the emphases was on industrialization for that end it was considered to make the system of the country reliable. Therefore Rajasthan state electricity board came into existence in July 1957.
In 1957 RSEB (Rajasthan State Electric Board) is comes in to existence and it satisfactorily work from 1 july1957 at that time energy level in Rajasthan is very low . The 1st survey for energy capacity in Rajasthan is held in 1989 at that time the total electric energy capacity of Rajasthan is 20116 MW.At that time the main aim of RSEB is to supply electricity to entire Rajasthan in the most economical way.
and the RSEB comes under northern zone. During the 1st survey there are few GSS in Rajasthan and the Alwar GSS is one of them. The Alwar GSS is 2km away from the Railway station Alwar and located near the Govt. polytechnic college Alwar
LIGHTNING ARRESTOR
Lighting arrestor is a device, which protects the overhead lines and other electrical apparatus viz , transformer from overhead voltages and lighting When the positively charged cloud produce negative charge on the overhead line by electrostatic induction then the negative charge is however presented right under the cloud and portion of the line away from the cloud becomes positively charged This charge on the line does not flow
Description
The Thyrite Alugard lightning arrester consists of a stack of one or more units connected in series depending on the voltage and the operating condition of the circuit Three single pole arresters are required for 3-phase installation. The arresters are single pole design and they are suitable for indoor and out-door service.
Each arrester unit consists essentrally of permanently sealed Porcelam housing equipped with pressure relief and containing a number of thyrite value-element dises and exclusive lumate gaps shunted by Thyrite resistors metal fitting cemented of the housing provide means for bolting arrester units into a stack. Each arrester unit is shipped assembled. No charging or testing operation is required before placing them in service.
Installation Location :-
Install arrester electrically as close as possible to the appearatus being protected Line and ground connections should be short and direct
grounding:
The arrester ground should be connected to the apparatus grounds and the main station ground utilizing a reliable common ground network of low resistance. The efficient operation of the lightning arrester requires permanent low resistance grounds : Station class arresters should be provided with a ground of a value not exceeding five ohms.
Clearances:
These are given on the drawings. These are the maximum recommended. The term ‘clearance’ means the actual distance between any part of the arrester or disconnecting device at line potential, and any object at ground potential or other phase potential.
ARRESTER VOLTAGE:
The thyrite staion-class arrester is designed to limit the surge voltages to a safe value by discharging the surge current to ground; and to interrupt the small power frequency follow current before the first current zero.The arrester rating is a define limit of its ablity to interrupt power follow current. It is important, therefore, to assure that the system power frequency voltage from line to ground under any condition switching,fault,overvoltage,never exceeds the arrester’s rating.
220 KV GRID SUBSTATION.doc (Size: 660.5 KB / Downloads: 131)
ABSTRUCT
A substation is an assembly of apparatus, which transform the characteristics of electrical energy from one form to another say from one voltage level to another level. Hence a substation is an intermediate link between the generating station and the load units
there are four bus bars in 132kv yard and five bus-bars in 220kv yard. the incoming feeders are connected to bus-bar through lighting arrestors, capacitive voltage transformer ,line isolator, circuit breakers current-transformers, line isolator etc. The bus-bars are to have an arrangement of auxiliary bus.
In the 220KV GSS the income 220KV supply is stepped down to 132Kv with the help of transformers which is furthers supplied to different sub-station according to the load.220Kv G.S.S. has a large layout consisting of 3 Nos. of 100MVA transformers, with their voltage ratio respectively 220/132Kv in addition to these transformers. There are many other equipment’s are also installed in220 KV yards
At "GSS ALWAR" the separate control room switches and fuses. There are meters for reading purpose. A circuit concerning the panel is shown on the panel with standard co lour.provided for remote protection of 220KV switch yards transformer incoming feeder, outing feeders. Bus bar has their own control plant in their control rooms. The control panel carrier the appropriate relays. Necessary meters indicating lamp control.
INTRODUCTION
AN OVERVIEW OF R.S.E.B.
“Rajasthan State Electricity Board” started working form 1 July, 1957. When India becomes independent its overall installed capacity was hardly 1900 mw. During first year plan (1951-1956) this capacity was only 2300 mw. The contribution of Rajasthan state was negligible during 1&2 year plans the emphases was on industrialization for that end it was considered to make the system of the country reliable. Therefore Rajasthan state electricity board came into existence in July 1957.
In 1957 RSEB (Rajasthan State Electric Board) is comes in to existence and it satisfactorily work from 1 july1957 at that time energy level in Rajasthan is very low . The 1st survey for energy capacity in Rajasthan is held in 1989 at that time the total electric energy capacity of Rajasthan is 20116 MW.At that time the main aim of RSEB is to supply electricity to entire Rajasthan in the most economical way.
and the RSEB comes under northern zone. During the 1st survey there are few GSS in Rajasthan and the Alwar GSS is one of them. The Alwar GSS is 2km away from the Railway station Alwar and located near the Govt. polytechnic college Alwar
LIGHTNING ARRESTOR
Lighting arrestor is a device, which protects the overhead lines and other electrical apparatus viz , transformer from overhead voltages and lighting When the positively charged cloud produce negative charge on the overhead line by electrostatic induction then the negative charge is however presented right under the cloud and portion of the line away from the cloud becomes positively charged This charge on the line does not flow
Description
The Thyrite Alugard lightning arrester consists of a stack of one or more units connected in series depending on the voltage and the operating condition of the circuit Three single pole arresters are required for 3-phase installation. The arresters are single pole design and they are suitable for indoor and out-door service.
Each arrester unit consists essentrally of permanently sealed Porcelam housing equipped with pressure relief and containing a number of thyrite value-element dises and exclusive lumate gaps shunted by Thyrite resistors metal fitting cemented of the housing provide means for bolting arrester units into a stack. Each arrester unit is shipped assembled. No charging or testing operation is required before placing them in service.
Installation Location :-
Install arrester electrically as close as possible to the appearatus being protected Line and ground connections should be short and direct
grounding:
The arrester ground should be connected to the apparatus grounds and the main station ground utilizing a reliable common ground network of low resistance. The efficient operation of the lightning arrester requires permanent low resistance grounds : Station class arresters should be provided with a ground of a value not exceeding five ohms.
Clearances:
These are given on the drawings. These are the maximum recommended. The term ‘clearance’ means the actual distance between any part of the arrester or disconnecting device at line potential, and any object at ground potential or other phase potential.
ARRESTER VOLTAGE:
The thyrite staion-class arrester is designed to limit the surge voltages to a safe value by discharging the surge current to ground; and to interrupt the small power frequency follow current before the first current zero.The arrester rating is a define limit of its ablity to interrupt power follow current. It is important, therefore, to assure that the system power frequency voltage from line to ground under any condition switching,fault,overvoltage,never exceeds the arrester’s rating.