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33KV RMU MV Gas Insulated Ring Main Switchgear
Cotenele is one of the main suppliers of HXGN-40.5 series 33KV RMU MV Gas Insulated Ring Main Switchgear to State Grid Corporation of China. Our ring main unit products are not only sold domestically, but also exported to multiple countries and regions in Africa, Europe, and the Middle East. The HXGN-40.5 series 35KV medium-voltage ring main unit is a 50Hz AC three-phase indoor medium-voltage distribution equipment. It has the characteristics of safe use, unaffected by climate, easy installation, minimal maintenance, and compact size, and is suitable for installation in box type substations.
The XGN-40.5 series 33KV RMU MV Gas Insulated Ring Main Switchgear manufactured by Cotenele company adopts a modular design, which can be installed fixedly or flexibly expanded. The XGN-40.5 series gas-insulated ring main unit has the characteristics of compact structure, full insulation, long service life, maintenance free, small footprint, complete solutions, strong scalability, and is not affected by the environment.
It can be widely used in industrial and civilian ring networks and terminal power supply networks. Specially suitable for small secondary distribution stations, switch stations, industrial and mining enterprises, airports, railways, highways, subways, commercial areas, residential areas, wind power, optoelectronics and other fields.The XGN15-40.5 series medium-voltage ring main unit complies with the provisions of GB3906 "3-35kV AC Metal Enclosed Switchgear" and IEC62271-200.
Model and meanings
What are the operation conditions of the XGN15-40.5?
1. Ambient air temperature: maximum +40°C, minimum -20°C.
2. Relative humidity: monthly average not exceeding 95%, daily average not exceeding 90%.
3. Altitude: maximum installation height 2500 m above sea level (customization required for higher altitudes).
4. The site shall be free from flammable or explosive substances, severe pollution, chemical corrosion, and violent vibration.
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Technical Parameters
| Item | Unit | C-unit(Load Break Switch unit) | F-unit(Fuse and load break switch combination unit) | V-unit(Circuit breaker unit) | |
| Rated Voltage | kV | 40.5 | |||
| Rated Current | A | 630 | 63(Based on the rated current value of the fuse wire) | 630 | |
| Rated Frequency | Hz | 50/60 | |||
| Rated insulation level | Power frequency withstand voltage (between phases and phase-to-earth) | k | 95 | ||
| Power frequency withstand voltage (across open contacts / isolating distance) | 110 | ||||
| Power frequency withstand voltage (control and auxiliary circuits) | 2 | ||||
| Lightning impulse withstand voltage (between phases and phase-to-earth) | 185 | ||||
| Lightning impulse withstand voltage (across open contacts / isolating distance) | 215 | ||||
| Rated short-time withstand current | Main circuit / 4 seconds | kA | 20 | 一 | 20 |
| Earthing circuit / 4 seconds | kA | 20 | 一 | 20 | |
| Earthing connection circuit / 4 seconds | kA | 17.4 | 一 | 17.4 | |
| Rated peak withstand current | Main circuit | kA | 50 | 一 | 50 |
| Earthing circuit | kA | 43.5 | 一 | 43.5 | |
| Rated short-circuit making current | kA | 50 | 80 | 50 | |
| Rated short-circuit breaking current | kA | 31.5 | 20 | ||
| Rated transfer current | A | 一 | 750 | 一 | |
| Rated active load breaking current | A | 630 | 一 | 一 | |
| Rated closed-loop breaking current | A | 630 | 一 | 一 | |
| Cable charging current test | A | 21 | 一 | 31.5(C1) | |
| Unit dimensions (width × depth × height) | mm | 450x885×2060 | 450x885x2060 | 450x885x2060 | |
| Rated pressure of SF6 gas (relative value at 20°C) | Rated gas filling pressure | Mpa | 0.04 | ||
| Minimum functional pressure | Mpa | 0.02 | |||
| Protection Grade | Sealed enclosure | IP67 | |||
| Switchgear enclosure | IP4X | ||||
| Annual relative gas leakage rate | %/Y | ≤0.01 | |||
What are the product features of the XGN15-40.5 Ring Main Unit?
1. Modular four-compartment design: The unit consists of four clearly separated sections: the switchgear compartment, the fuse compartment, the operating mechanism compartment, and the cable compartment (base frame). This layout simplifies maintenance and improves safety.
2. Robust sealed switchgear construction:The switchgear compartment is formed by a metal housing welded from 3L cold-rolled steel (or stainless steel). It contains all functional circuits, including the load switch, earthing switch, and internal busbars.
3. Vertical-motion load switch:The load switch operates with a vertically moving contact system. When closing, the moving contact travels downward to connect the circuit. Both main and arcing contacts are provided on the moving and fixed contacts, significantly increasing the number of safe breaking operations.
4. Powerful arc extinction: A self-blast (puffer) and inner-flow arc‑quenching structure is adopted. It ensures strong arc extinction without compromising phase‑to‑phase or phase‑to‑earth insulation.
5. Integrated earthing switch: The earthing switch consists of a moving blade and a fixed contact. It closes rapidly under spring force, ensuring reliable earthing.
6. Easy visual status checking: A viewing window on the front panel allows direct observation of the earthing switch position (open or closed). The top and rear of the switchgear compartment have four rectangular access holes for assembly and maintenance.
7. Pressure relief for safety: Safety Pressure Relief: The 33KV RMU MV Gas Insulated Ring Main Switchgear is equipped with an explosion-proof device at the rear to release pressure in the event of an internal arc fault.
8. Transformer protection with fuse-trip mechanism: The fuse compartment houses high‑voltage current‑limiting fuses within an epoxy‑cast insulating housing. When a fuse blows, a striker pin is ejected, which mechanically trips the load break switch – providing fast and reliable transformer protection.
9. Convenient operating mechanism layout: All controls are located on the front panel. Each functional circuit is equipped with a manual (or optional motor‑charged) spring‑operating mechanism for the load switch, and a manual spring‑operating mechanism for the earthing switch.
10. Clear user interface and indication: The front panel includes:
Rotary knobs for load switch closing, manual opening, and earthing switch operation.
Indicator lamps for load switch open/closed status.
Push buttons for electrical opening/closing (when motor drive is fitted).
A mimic diagram, position indication labels, and a padlockable position for added security.
11. Integrated interlocking (anti‑misoperation): Mechanical interlocks between the load switch and the earthing switch prevent incorrect operations, ensuring full "five‑prevention" safety compliance.
How To Buy The XGN15-40.5 Ring Main Unit?
The 33KV RMU MV Gas Insulated Ring Main Switchgear need to be customized, for ensuring a ordering process smoothly, please provide the following information:
1. Basic order or purchasing information:Product name, specification, model, quantity, rated voltage of the fuses, and requested delivery date.
2. Drawings: Single-line diagram (primary system diagram), arrangement drawing or floor plan of the ring main unit.
3. Required accessories: List any spare parts or special tools needed, such as gas filling and releasing device.
4. Shell color for the RMU:Specify the desired RAL code or color standard for the enclosure.
5. Special needs:If above information can not meet your requirements, please tell us your any additional technical or functional needs, they can be discussed and agreed upon separately.
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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