We also have the capability to manufacture gas insulated switchgear (“GIS”), which is used in high voltage power networks to safely and reliably control and protect electrical equipment in compact environments such as electrical substations. We have a technical collaboration with Chung HSIN Electric and Machinery Manufacturing Corporation, Taiwan (“CHEM Taiwan”), who are global player in GIS technology. Under the collaboration agreement with CHEM Taiwan, we have manufactured and supplied up to 252 kV GIS bays from our Gangol Plant to transmission utilities.
Technical Data
Type
Unit
CFTA
IFT
Rated voltage
kV
72.5
145
245
420
Rated power frequency withstand voltage
Kvrms
140
275
460
650
Rated lightning impulse withstand voltage
Kvp
325
650
1050
1425
Rated switching impulse withstand voltage
Kvp
-
-
-
-
Rated normal current bus bar
A
2000
3150
4000
6300
Rated normal current feeder
A
2000
3150
4000
6300
Rated short circuit breaking current
kArms
upto 40
upto 40
upto 50
upto 63
Rated peak withstand current
KAp
104
108
135
164
Rated short time withstand current
kA/sec
40/3
40/3
50/3
63/3
Leakage rate per year & gas compartment
%
<0.1
Driving mechanism of circuit breaker
-
Stored energy spring (common pole drive)
Operating sequence
-
0-0.3 s-CO-3 min CO or CO-15 S-CO
Ambient temperature
°C
-30 to +40
Standard
-
IEC & ANSI
Inspection
years
>20
Expected lifetime
years
>40
Sectional View
Main Bus
Disconnector
Earthing Switch
Circuit Breaker
Current Transformer
Voltage Transformer
Lightning Arrestor
Operating Cubicle
Fault Making ES
Cable Head Box
Local Control Panel
Key Features
Advanced Technology:
Efficient arc extinguishing technique offers enhanced life to breaker with 20 operations at full rated short circuit current.
Compact Design:
Requires half the space of traditional design.
Higher Reliability:
Robust operating mechanism offers almost 30 years of maintenance free operating life. Metallic enclosures are designed and tested for the stringent requirement of internal gas pressure developed under internal arc fault conditions to offer highest safety to the operating personnel.
Quality Assurance:
Well-established quality assurance system ensures higher reliability, safety and availability of the system. Environment Friendly - Low SF6 leakage rate (0.1% per annum)
Maintenance-free:
The operating mechanism is lubricated for its long life and virtually needs no maintenance. With low leakage rate, there is no need for any maintenance either in the internal assemblies or by way of gas monitoring and refilling.
