What is GIS (Gas Insulated Switchgear)
Answers were Sorted based on User's Feedback
It is very much required to establish an electrical substation at load center. Since, establishing a substation at load center is quite economical and profitable in many aspects. As it reduces length of feeders and due to short length feeders, the quality of voltage regulation improves. But the main obstruction of establishing a substation at load center is space. Generally main load center of any place is situated at very congested place where, sufficient land for establishing conventional electrical substation is very hardly available.
his problem can be solved by using gas insulated switchgear technology. In this type of switchgear, all the necessary components of switchgear can be assembled in very limited space. GIS is a kind of metal enclosed switchgear. That means, all the equipments of the electrical switchgear are enclosed by gas tight metal enclosure and SF6 gas is used as insulation between live parts of the equipments and earthed metal enclosure. This type of switchgear, means, gas insulated switchgear is available from 12 KV system to 800 KV system. For establishing electrical substation in very limited place this type of SF6 insulated electrical switchgear plays the major role.
Gas insulated components of substation are generally,
Electrical bus bars.
Electrical isolators or disconnectors.
Circuit breakers.
Current transformers.
Voltage transformers.
Earth switches.
Surge arrestors or lightning arresters.
The substation, assembled by gas insulated switchgear, is popularly known as gas insulated metal enclosed substation (GIMES). GIMES technology is not very recent invention, it is successfully running for over thirty years. In gas insulated medium voltage switchgear, vacuum technology is used as interrupting purpose and SF6 gas is used as insulation material. Although for both interruption and insulation, SF6 gas is used in many medium voltage GIS system. But for such equipments rated SF6 gas pressures are different for interruption and insulation. SF6 gas pressure for insulating purpose is generally kept below 2.5 bar whereas SF6 gas pressure for interrupting purpose is ranged from 5 bar to 7 bar. As vacuum technology is not available for high voltage, so for GIS or gas insulated switchgear system above 72.5 KV, only SF6 is used both for interruption medium and insulation. There are different types of gas insulated metal enclosed switchgears available depending upon their constructional feature.
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / m.vijayaragavan
HI,
THE EAQUIPMENTS IN THE SUBSTATION ARE INSULATED EACH
OTHER WITH GAS. NORMALLY THE INDOOR SUBSTATION WE SAYING AS
GIS. .IN OUTDOOR SUBSTATION THE EQUIPMENTS ARE INSULATED
WITH AIR.
THANKS,
M.VIJAYARAGAVAN,
TECHNO ELECT LTD,
KOLKATA.
Is This Answer Correct ? | 3 Yes | 3 No |
If ac 230volts inputsupply to full wave rectifire what is D C output voltage.
why does the magnetic balance tests at transformer?
what is the purpose of vector group in a transformer ? if 2 tranaformers r connected in parallel the vector group is same or not? for parallel operation 2 transformers of different manufacturers maintain same vector group or not?
HOW TO CALCULATE EARTHING SIZING?
IS there any special instructions to be taken while installing the tranformer.
why do we need to use 3c+3e cable, normally i select only 3c+e cable and i think it is enough. pls explain the usefull of 3e cable ( in this project the earthing system is well done)
why capacitor burst?
whether Transformer is singly excited or doubly excited machine?
how to reduce earth to neutral voltage?
why any Elelctricity board insist not to change the buren of their metering CTs or PTs for metering purpose? as a example elect. board not accepted that any customer change their metering CT or PT core burden from 5VA to 15VA.. why?
what is Fault level? why it is calculated? how will u decide same for our plant?
Please mention any books for electrical design load calculation for industrial,commercial(to select cable,breaker,bus bar,stator,)