| Brand | ROCKWILL |
| Model NO. | HV Gas insulated switchgear (GIS) Chinese manufacturer-72.5kV 126kV 145kV |
| Rated voltage | 145kV |
| Rated normal current | 3150A |
| Rated frequency | 50/60Hz |
| Rated short circuit breaking current | 40kA |
| Rated peak value withstand current | 104kA |
| Series | RHG |
The RHG Series GIS is a high-performance gas-insulated switchgear designed for power transmission and distribution substations at rated voltages up to 145kV. Featuring standard modular components and flexible combination capabilities, it integrates space-saving design with KEMA-certified technical compliance. The compact structure achieves a minimum single-bay width of 800mm, effectively saving installation space.
| No. | Item | Unit | Parameter Value | |||
|---|---|---|---|---|---|---|
| 1 | Rated Voltage | kV | 72.5 | 126 | 145 | |
| 2 | Rated Current | A | 2000/3150 | |||
| 3 | Rated frequency | Hz | 50/60 | |||
| 4 | Power frequency voltage test (Phase to ground/fracture, kV/1min) | kV | 140/160 | 230/265 | 275/315 | |
| 5 | Peak value of lightning impulse withstand voltage (1.2/50us) (Phase to ground/fracture) | kV | 325/375 | 550/630 | 650/750 | |
| 6 | Rated short-time withstand current | kA/s | 40/4 | |||
| 7 | Rated peak withstand current | kA | 100 | 100 | 104 | |
| 8 | Rated pressure of SF₆ (20) | Full Bay | MPa | 0.60 | ||
| Single Insulator | MPa | 0.50 | ||||
| Other | MPa | 0.40 | ||||
| 9 | Annual leakage rate of SF₆ | % | ≤0.1 | |||
| 10 | Partial discharge (Under 80% rated power frequency withstand voltage) | Whole bay | pC | ≤3 | ||
| Single insulator | pC | ≤2 | ||||
| 11 | Circuit Breaker | Mechanical life | Cycle | 12000 | ||
| Electrical life | Cycle | 22 | ||||
| 12 | Three-position switch | Mechanical life | Cycle | 11000 | ||
| Conversion current | A | 2000 | ||||
| Conversion voltage | V | 300 | ||||
| 13 | FES designed solely with the characteristic of super class B | Electromagnetic induction | / | 250A/6kV | ||
| Electrostatic induction | / | 5A/20kV | ||||
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.
Equipped with current transformers and various sensors, this GIS integrates overcurrent, short-circuit, ground fault and overvoltage protection functions; it monitors real-time electrical parameters, automatically trips the circuit breaker and triggers protection actions once current or voltage abnormalities are detected to isolate faulty circuits and guarantee safe operation of the power system and equipment.
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