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.
Combined current/voltage transformer TG COMBI
Gas-insulated instrument transformer for enhanced safety and reliability
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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