GIS Ring Main Unit 24kV 12kV Gas Insulated Switchboard Electrical Switchgear
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Product Descriprtion
The SF6 ring main unit (RMU) uses an SF6 load switch as the main switch. This compact and expandable metal-enclosed switchgear is suitable for distribution automation. It features a simple structure, flexible operation, reliable interlocking, and easy installation, providing satisfactory technical solutions for various applications and users. With the adoption of sensor technology and up-to-date protection relays, combined with advanced technology and flexible assembly options, the HXGN15 unit-type SF6 RMU can fully meet the requirements of a continuously evolving market.
The unit can be equipped with the self-produced FLBS36 SF6 load break switch. Additionally, based on user requirements, it can be assembled with internationally top-ranking VB4 series vacuum circuit breakers with permanent magnetic mechanisms made by AREVA, or HD4 type SF6 circuit breakers made by ABB, or our VS1.12 type vacuum circuit breakers with permanent magnetic mechanisms. The operation methods for the main switch inside the RMU can be either manual or electric power-driven.
Product Paramenters
| Item | Unit | Parameter |
| Rated voltage | kV | 12 24 40.5 |
| Rated frequency | Hz | 50 |
| Rated current | A | 630/1250/2500/3150/4000/630/1250/2500 |
| Power frequency withstand voltage (phase-to-phase and phase-to-ground) | kV | 42 65 95 |
| Power frequency withstand voltage (insulation breaking) | kV | 48 79 118 |
| Lightning impulse withstand voltage (phase-to-phase and phase-to-ground) | kV | 75 125 185 |
| Lightning impulse withstand voltage (insulation breaking) | kV | 85 145 215 |
| Rated power frequency withstand voltage of auxiliary circuit | kV | 2 |
| Rated instantaneous withstand current | kA | 25/31.5/40 |
| Rated short-circuit period | s | 3 |
| Rated peak withstand current | kA | 63/80/100 63/80/100 50/63/80 |
| Rated short-circuit breaking current of circuit breaker | kA | 25/31.5/40 25/31.5/40 25/31.5 |
| Rated short-circuit closing current of circuit breaker (peak) | kA | 63/80/100 63/80/100 50/63/80 |
| Rated cable charge breaking current | A | 25 |
| Rated operating sequence | O-0.3s-CO-3min-CO | |
| Insulation gas | SF6 | |
| Mechanical life | Time | 10000 |
| Three-position switch | Time | 5000 |
| Rated charge pressure (abs, 20°C) | Mpa | 0.14 |
| Minimum charge pressure (abs, 20°C) | Mpa | 0.12 |
| Sealed enclosure | Grade | IP67 |
| Switch shell | Grade | UP4X |
| Annual relative leak rate of dry air | %/year | ≤0.1 |
| Rated power voltage of auxiliary circuit | V | DC48/110/220 AC220 |
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