CHEM was established in 1956 in Taiwan and became Public company in 1994. The first GIS was manufactured and dispatched by them in 1987. CHEM has supplied over 5000 Bays in last 24 years and are leader in Taiwan Market enjoying over 70% of Market Share.
CHEM has a strong technology base, evident by their extensive type testing record. CHEM have carried out the Type Test on all range of GIS upto 500kV at CESI/KEMA and also on GCB upto 765kV. In-house Test facilities are also available to carry out Routine and Type tests to comply with IEC and ANSI standards
CHEM has highly vertically integrated manufacturing facilities with over 90% of the components being made in house. In fact, these facilities not only caters their own requirement of GIS components but also meets the need of some other GIS manufacturers like JAEPS, ABB, Areva, Siemens etc .
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.
