Current Transformer Up To 800 kV
Instrument Transformers and Bushings
Current Transformer Up To 800 kV
A large number of CG Current Transformers upto 550 kV have been put into service in various environments in over 60 countries since 1984 where they are operating satisfactorily. Type CT and Type IOSK, CTs are of live tank type with rated voltage of 72.5 to 800 kV.
All our Current Transformers (72.5 to 800 kV) adhere to the requirements of the international quality standards. Our quality systems, environment management systems, safety management systems are certified to ISO 9001–2008, ISO 14001 and ISO 18001 respectively.
Features
- Live tank (inverted type) construction
- Oil impregnated paper insulation
- Single width paper bushing construction
- Hermetically sealed construction
- Shielded cores and secondary windings
- Stainless steel metallic bellows for oil volume compensation and health indication
- Rigid and welded primary construction for abilities to withstand excessive dynamic currents
- Excellent thermal stability of insulation
- Metallic flanges are cemented to porcelain to give uniform load distribution.
Technical Specification
| Type | Rated Voltage | Insulation Level | Rated Current | Secondary Current | No. Of Cores | STR |
| CT | 72.5 | 145 / 325 | 500 – 4000 | 0.577 / 1 / 5 | 5 | |
| CT | 123 | 230 / 550 | 500 – 4000 | 0.577 / 1 / 5 | 5 | |
| IOSK | 145 | 276 / 650 | 500 – 4000 | 0.577 / 1 / 5 | 5 | |
| IOSK | 170 | 325 / 750 | 500 – 4000 | 0.577 / 1 / 5 | 5 | |
| IOSK | 245 | 460 / 1050 | 50 – 4000 | 1 or 5 | 5 | 50/1 or 40/3 |
| IOSK | 300 | 460 / 1050 & 850 | Up to 5000 | 1 or 5 | 5 | 50/3 |
| IOSK | 420 | 630 / 1425 & 1050 | Up to 4000 | 1 or 5 | 5 | 63/1 or 40/3 |
| IOSK | 550 | 680 / 1550 & 1175 | Up to 5000 | 1 or 5 | 5 | 50/1 |
| IOSK | 800 | 975/ 2100 & 1550 | Up to 5000 | 1 or 5 | 5 | 63/1 |
The performance and reliability of these Current Transformers has been verified at renowned international testing laboratories like KEMA (Netherlands) and CPRI (India). The CTs are type tested for short circuit performance, Thermal Stability Test, Multiple Chopped wave Impulse test, wet Lightning Impulse Test, partial discharge etc. as per IEC.