Horizontal knee disconnector GW57
Maximum reliability and minimal maintenance
The GW57 disconnectors are available up to 550 kV, 4000 A and 63 kA. These disconnectors have a low friction design and offer minimized contact resistance. They are equipped with interlocking for reliability in extreme conditions. Some other important features of these disconnectors are:
- Stable open/close movement of disconnectors
- No overheating and constant contact resistance over life time
- Self cleaning design for contacts
- Maintenance-free rotating contacts in the knees (no flex braids) and also on the housing
- Ice breaking capacity
Applications
The horizontal knee disconnector requires minimal space in both horizontal and vertical directions making them ideal for substations with small installation area.
Why Hitachi Energy?
- Worldwide experience
- Maximum reliability and minimal maintenance
- Energy efficient solution
- Easy and quick erection
- Reliable and smooth operation
- Suitable for a wide range of environmental conditions
Brief performance data
| Rated voltage (kV) | 245 | 550 |
|---|---|---|
| Rated current (A) | up to 4000 | |
| Short time withstand current (kA) | up to 63 | |
| Power frequency withstand voltage | ||
| · against earth | 460 | 620 |
| · across isolating distance | 530 | 800 |
| Lightning impulse withstand voltage | ||
| · against earth | 1050 | 1550 |
| · across isolating distance | 1200 | 1550 (+315) |
| Switching impulse withstand voltage | ||
| · against earth | - | 1175 |
| · across isolating distance | - | 900 (+450) |
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