| Brand | ROCKWILL |
| Model NO. | SF6 Gas Insulated Switchgear for Substation Retrofit-40.5kV |
| Rated voltage | 40.5kV |
| Rated normal current | 2000A |
| Series | RHG |
The RHG-40.5 GIS is an SF6 gas-insulated metal-enclosed switchgear developed from 126kV GIS technology for 40.5kV medium-voltage power networks. It is designed for power systems, power generation, rail transit, petrochemicals, metallurgy, mining, and large industrial sectors.
Optimized for retrofitting old air-insulated switchgear, the product features a cabinet width of 1200–1680mm and depth of 2800–3200mm, allowing installation without redoing foundations, replacing cables, or reinforcing load-bearing structures.
|
No.
|
Items
|
Units
|
Parameter value
|
|
|---|---|---|---|---|
|
1
|
Rated voltage
|
kV
|
40.5
|
|
|
2
|
Rated current
|
A
|
Feeder current 1250 2000 2500 3150
Main bus maximum current 4000
|
|
|
3
|
Rated 1 min power frequency withstand voltage (1min, RMS)
|
Phase-to-phase, Phase-to-ground
|
kV
|
95
|
|
Across the isolating distance
|
118
|
|||
|
4
|
Rated lightning impulse voltage (peak)
|
Phase-to-phase, Phase-to-ground
|
kV
|
185
|
|
Across the isolating distance
|
215
|
|||
|
5
|
Rated short circuit breaking current
|
kA
|
31.5
|
|
|
6
|
Rated short-time withstand current/rated duration of short-circuit
|
kA/s
|
31.5/4
|
|
|
7
|
Rated peak withstand current
|
kA
|
82
|
|
|
8
|
Rated short-circuit current breaking times
|
times
|
22
|
|
|
9
|
The grade of restrike during capacitive current switching
|
/
|
C2
|
|
|
10
|
Mechanical life of circuit breaker
|
times
|
10000 (M2)
|
|
|
11
|
Mechanical life of three-position disconnector
|
times
|
10000
|
|
|
12
|
Mechanical life of Fault Earthing Switch
|
times
|
10000
|
|
|
13
|
The closing ability of Fault Earthing Switch
|
times
|
2
|
|
|
14
|
SF6 yearly gas leakage rate
|
%
|
≤0.1
|
|
|
15
|
Type of loss of running continuity
|
Category
|
LSC2B
|
|
Due to the excellent insulation performance, arc extinguishing performance and stability performance of SF6 gas, GIS equipment has the advantages of small footprint, strong arc extinguishing ability and high reliability, but the insulation ability of SF6 gas is greatly affected by the uniformity of the electric field, and it is easy to have insulation abnormalities when there are tips or foreign objects inside the GIS.
GIS equipment adopts a fully enclosed structure, which brings the advantages of internal components without environmental interference, long maintenance cycle, low maintenance workload, low electromagnetic interference, etc., while also having problems such as complex single overhaul work and relatively poor detection methods, and when the closed structure is eroded and damaged by the external environment, it will further bring a series of problems such as water ingress and air leakage.
The insulating property of SF₆ gas relies on its stable molecular structure, which makes electron escape and collision ionization difficult under normal operating voltages, ensuring high insulation resistance. In GIS, insulation is precisely maintained by controlling gas pressure, purity, and electric field distribution to guarantee a uniform and stable electric field between high-voltage conductors and the grounded enclosure.
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