Horizontal knee disconnector DDK
Maximum reliability and minimal maintenance
The horizontal knee disconnector requires the smallest spaces in both horizontal and vertical directions, suitable for substation with small installation area. The DDK800 disconnector is available for rated parameters 800kV, 3150A and 50kA
- Self-aligned contact system
- Special spring-less contact design to prevent opening of contact during short circuit
- Minimized contact resistance
- Stable open/close movement of disconnectors;
- Driving and driven pipe well supported by compression and extension spring
- Large contacting area between moving contacts and fixed contacts
- Guiding device
Maximum reliability and minimal maintenance
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) | 800 kV |
|---|---|
| Rated current (A) | 3150 |
| Short time withstand current (kA) | 50 kA/3s |
| Power frequency withstand voltage | |
| against earth | 830 |
| across isolating distance | 1150 |
| Lightning impulse withstand voltage | |
| against earth | 2100 |
| across isolating distance | 2100+(455) |
| Switching impulse withstand voltage | |
| against earth | 1550 |
| between phases | 2480 |
| across isolating distance | 1175+(650) |
Something caught your eye?
Our sales team will get in touch with you