8DN8 type HIS is a high-voltage switchgear solution with a rated voltage of up to 145 kV, which is mainly used for economic renewal or expansion of air-insulated outdoor and indoor substations, especially if the operator wants to carry out modifications while the switchgear is in service.
The HIS (Highly Integrated Switchgear) 8DN8 is a compact, gas‑insulated solution for indoor and outdoor substations. It occupies less than half the space of comparable air‑insulated switchgear, making it ideal for space‑constrained projects and for upgrades while the system remains in service.
The switchgear uses SF6 gas for insulation, features corrosion‑resistant aluminum castings, and includes integrated circuit‑breakers, disconnectors, and earthing switches. Technical data include a rated voltage up to 145 kV, short‑breaking current of 40 kA, and an expected service life of over 50 years.
| Rated voltage | up to 145 kV |
|---|---|
| Rated frequency | 50/60 Hz |
| Rated lightning impulse withstand voltage | 650 kV (1.2/50 µs) |
| Rated short‑breaking current | 40 kA |
| Rated short‑time withstand current | 40 kA |
| Expected lifetime | > 50 years |
| Standards | IEC/HEEE |
It is rated for up to 145 kV.
It requires less than half the space of a comparable air‑insulated switchgear.
The expected lifetime is greater than 50 years.