Combined current/voltage transformer TG COMBI
Gas-insulated instrument transformer for enhanced safety and reliability
TG COMBI gas-insulated combined current and voltage transformer is built for revenue metering and protection in high voltage networks. The TG COMBI has been designed for voltage up to 420 kV.
Applications
- Revenue metering
- Protective relaying
- System control and indication of power flow
Why Hitachi Energy?
For the TG COMBI the combination of SF6 gas insulation and with a composite insulator, offers several advantages:
- Explosion proof design
- Absence of partial discharge
- Dielectric mean not subjected to aging
- Higher performance in very heavy polluted environments
- Maintenance free
The integration of two purposes (current transformer and voltage transformer) in one piece of equipment provides benefits in terms of:
- Cost of the equipment
- Quantity of gas
- Space required
- Costs of transportation and packaging
- Time for erection and commissioning
- Cables for interconnection
- Foundations and structures
Brief performance data
| TG COMBI | |
|---|---|
| Installation | Outdoor |
| Design | Top-core Type |
| Insulation | SF6 Gas |
| Highest voltage for equipment | 72.5 - 420 kV |
| Power frequency withstand voltage | Up to 630 kV |
| Lightning impulse withstand voltage | Up to 1.425 kV |
| Short-circuit current | Up to 63 kA |
| Insulators | Composite |
| Ambient temperature | -50°C to +40°C |
| Creepage distance | ≥ 25 mm/kV |
| Accuracy | Meets all IEC and IEEE metering and protection classes |
| other values on request |
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