40.5KV Ring Main Unit High Current High Voltage Switchgear RMU

Enter the realm of cutting-edge power distribution with Kexunan's 40.5KV Ring Main Unit High Current High Voltage Switchgear RMU. As a leading manufacturer with a state-of-the-art factory, Kexunan is committed to delivering high-quality solutions for high voltage applications. Our meticulously crafted RMU switchgear, tailored for high current scenarios, showcases our dedication to excellence in manufacturing. Choose Kexunan as your trusted manufacturer and tap into the capabilities of our advanced factory, ensuring top-notch standards of durability and performance. Elevate your high voltage infrastructure with Kexunan's reliable and efficient RMU switchgear solutions, setting a new benchmark in the industry.

Over the past few years, as society and the economy have progressed, engineering construction has become more complex due to technological advancements. There is a growing demand for smaller switch equipment that requires minimal maintenance and is intelligent. Both domestic and international switch manufacturing companies are actively developing medium voltage gas-filled cabinets, also known as gas-insulated switchgear (C-GIS). Gas-insulated switchgear refers to enclosing high-voltage components such as busbars, circuit breakers, isolating switches, and power cables within a shell with lower gas pressure.

1. By utilizing sulfur hexafluoride gas as a medium for insulation and extinguishing arcs, the switchgear's size can be significantly decreased, resulting in a more compact and smaller design.

2. The main circuit's reliable and safe conductive part is sealed within SF6 gas, ensuring that the high-voltage live conductor remains enclosed and unaffected by external factors. This guarantees the equipment's long-term safe operation and high reliability.

3. There is no danger of electric shock or fire.

4. The switchgear is designed with an independent modular structure, where the air box is constructed from high-precision aluminium plates and can be disassembled. The isolation switch employs a linear transmission with three positions. An additional control module with almost 100 PLC points is included for grounding, isolation switch, and remote operations to minimize control relays and circuit confusion. The modular mechanism switch connects opening and closing points with plum blossom contacts. This eliminates the possibility of non-operation in the original rotary isolation switch and grounding switch, resolves the issue of unstable and excessive contact resistance in the original rotary isolation switch, and includes shielding and voltage equalization covers on each contact's exterior to address partial discharge problems during switch breakpoints production.

5. The gas-insulated switchgear is convenient and flexible to apply and arrange. It can serve as an independent unit and meet various main wiring requirements through combination. Delivering it to the site as units can shorten on-site installation and enhance reliability.

40.5KV Ring Main Unit High Current High Voltage Switchgear RMU Execution standards

GB/T11022-1999 Common technical requirements for high-voltage switchgear and control equipment standards

GB3906-2006 3.6kV~40.5kV AC Metal Enclosed Switchgear and Control Equipment

GB311.1-1997 Insulation Coordination of High Voltage Transmission and Transformation Equipment

GB/T16927.1-1997 High voltage testing technology Part: General test requirements

GB/T16927.2-1997 High voltage testing techniques Part 2: Measurement systems

GB/T7354-2003 Partial discharge measurement

GB1984-1989 AC High Voltage Circuit Breakers

GB3309-1989 Mechanical tests of high-voltage switchgear at room temperature

GB4208-2008 Code for Degree of Protection Provided by Enclosures (IP)

GB12022-2006 Industrial sulfur hexafluoride

GB8905-1988 Guidelines for gas management and inspection in sulfur hexafluoride electrical equipment

GB11023-1989 Test method for sulfur hexafluoride gas sealing of high-voltage switchgear

GB/T13384-1992 General technical requirements for packaging of electromechanical products

GB4207-2003 Solid insulation materials - Determination of relative and resistance to electrical trace index under humid conditions

GB/T14598.3-2006 Electrical relays - Part 5: Insulation of electrical relays

GB/T17626.2-1998 Electromagnetic Compatibility Testing and Measurement Techniques - Electrostatic Discharge Reactance Interference Test

GB/T17626.4-2008 Electromagnetic Compatibility Testing and Measurement Techniques - Electrical Fast Transient Pulse Group Immunity Test

GB/T17626.5-2008 Electromagnetic Compatibility Testing and Measurement Techniques - Surge (Impulse) Immunity Test

GB/T17626.12-1998 Electromagnetic Compatibility Testing and Measurement Techniques - Oscillating Wave Immunity Test

40.5KV Ring Main Unit High Current High Voltage Switchgear RMU Test Type

◆ Insulation test

◆ Temperature rise test

◆ Loop resistance measurement

◆ Short-time withstand current and peak withstand current tests.

◆ Verification of making and breaking capabilities

◆ Mechanical operation and mechanical characteristic testing tests

◆ Protection level detection

◆ Additional tests on auxiliary and control circuits

◆ Pressure tolerance test for inflatable compartments

◆ Sealing test

◆ Internal arc test

◆ Electromagnetic compatibility test

40.5KV Ring Main Unit High Current High Voltage Switchgear RMU Basic Scheme

Operation Condition

Technical Parameter

Grounding and Separation

The C-GIS gas-insulated high-voltage switchgear is available in various current levels, including 630A, 1250A, 1600A, 2000A, 2500A, 3150A, etc. The cabinet size can be customized to meet specific requirements. The outer shell is constructed from a plate coated with aluminium zinc, while the gas box is assembled using high-quality stainless steel plates (304 grade). Each unit can be expanded and combined independently according to the design plan. The cabinet is divided into different rooms: a secondary control room, busbar room, circuit breaker room, circuit breaker operating mechanism room, and cable room. The cable connection height can reach 700mm, allowing for convenient maintenance and installation. The cabinet is also equipped with a comprehensive grounding protection system. The switchgear comprises isolated functional compartments, including switch rooms, busbar rooms, cable rooms, and secondary circuit channels. A grounding metal partition separates each functional compartment, ensuring independent operation.

Secondary control room

The cabinet can be found right under the secondary control room, and it contains boards for adding components and brackets for securing terminal blocks. The secondary control room is designed to accommodate different devices, such as wiring terminals, small busbar terminals, and comprehensive protection devices. These devices allow the system to carry out tasks like remote control, telemetry, remote signalling, and local monitoring. Circular openings on the side panels and terminals simplify connecting the cabinet with small busbars.

Busbar Compartment

Within the upper air box, there is a combination of the busbar room and the isolation mechanism. Once the cabinet is positioned on the ground support, the circuit cabinets and busbars on both the left and right sides are effectively connected through the merging of the cabinets.

Switch Room

The gas-insulated switch cabinet features a plate-like design consisting of two chambers positioned on top of the other in the cabinet's centre. The upper chamber has a three-position isolation switch, while the lower chamber contains a vacuum circuit breaker. The busbar, isolation switch, and circuit breaker are vertically arranged. The single chamber arrangement is simple, cost-effective, and easy to produce, but it has lower reliability due to the proximity of the components. Conversely, the multi-chamber structure ensures heightened safety by preventing interference between components and facilitating convenient replacement. However, it is a more intricate, challenging to manufacture, and expensive alternative.

Institutional Room

The spring-based system is positioned horizontally, with the isolation and circuit breaker mechanisms being distinctly separated. It is incorporated with the insulation rod of the vacuum arc extinguishing chamber both before and after, thereby simplifying the transmission process. The mechanism's performance features closely match the circuit breaker's opening and closing functions, leading to decreased energy consumption and improved mechanical dependability and adaptability.

Cable Room

The cabinet is positioned atop the cable room and has a pathway for relieving pressure. The height between the ground and the cable connection terminals can reach up to 700mm. To adhere to regulations, the cable room is equipped with grounding interlocks, enabling the installation of two cables and lightning arresters in each circuit. Additionally, the incoming and outgoing cables and the lightning arresters are connected using the internal cone insertion method.