Answer / virendra

GIS means Gas insulated Substation.

In this all the Switchgear like Circuit breaker, CT PT,
Isolator all kept in one champer filled with SF6 gas 1t 4
kg pressure
It aquires less space

Answer / hanupowergrid

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.

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.

why Lightening Arrester Probe sharp at Top of telecom tower.

0 Answers   Reliance Jio,

---

what is sevice settings for mccb?How can be it setted?

0 Answers   Bhel, Minda,

---

What is the meaning of TRI Vector meter?

7 Answers   ABB, Excel Power Switchgear,

---

What is the difference between rated and per unit in transformer?

0 Answers  

---

IF THE OUTPUT OF A 100KVA, 415V GENERATOR IS STEPPED UP TO 11KV WITH A 500KVA TRANSFORMER,CAN THE TRANSFORMER BE LOADED ABOVE THE SOURCE GENERATOR RATING?

4 Answers  

---

please send me jindal previous aptitude and technical question and answer.my email id is deep_raj@live.com

0 Answers  

---

why mosquito bat makes noise when it hits with a insect?

2 Answers  

---

one split ac how can told of this ac which Tr tell me us

0 Answers   Wipro,

---

How to design inductive load for 3 phase 440v and maximum 5 amps for star or delta? Can we use a 15kW, 1450rpm motor for 15kW, 960rpm apllication?If yes.how......n.if thesame motor used what`s it`s sideeefect.

0 Answers  

---

sir can you operated Transformer on frequency from that for which is design?

1 Answers   Kirloskar,

---

what is the pi test for current transformer?

1 Answers  

---

How does a clampmeter measures dc current

1 Answers  

---