12KV 3150A Switchgear Breaking Isolation Cabinet Medium Voltage Switchgear

Transform your power distribution system with Kexunan's 12KV 3150A Switchgear Breaking Isolation Cabinet Medium Voltage Switchgear. As a trusted manufacturer, Kexunan takes pride in delivering durable solutions that redefine reliability in medium voltage applications. Our switchgear, crafted with precision, stands as a testament to enduring quality. Count on Kexunan as your manufacturer of choice, and experience the resilience and longevity that our switchgear brings to your infrastructure. Choose Kexunan for durable, high-performance solutions that set new standards in medium voltage technology.

In the past few years, there has been an increase in the complexity of engineering construction due to the continuous development of society, economy, and switch technology. There is a growing preference for switch equipment that is smaller in size, requires less maintenance, and is intelligent. Both domestic and foreign switch manufacturing companies are actively developing medium voltage gas-filled cabinets (C-GIS), also known as gas-insulated switchgear. A gas-insulated switchgear encloses high-voltage components, such as busbars, circuit breakers, isolating switches, power cables, etc., within a shell with lower gas pressure.

1. By utilizing sulfur hexafluoride gas for insulation and arc extinguishing purposes, the switchgear's size can be significantly reduced, resulting in a more compact and miniaturized design.

2. The conductive part of the main circuit, which ensures high reliability and safety, is enclosed in SF6 gas, protecting it from external environmental conditions and ensuring long-term safe operation and reliability.

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

4. The switchgear is designed with independent modular components, with the air box made of high-precision aluminium plates that can be easily disassembled. The isolation switch adopts a three-position linear transmission, reducing control relay and circuit complexity. An additional control module with nearly 100 points of PLC is included for grounding, isolation switch, and all-electric remote operations. The mechanism switch is modular, connecting opening and closing points with plum blossom contacts. This eliminates issues such as non-operation of the original rotary isolation switch and grounding switch, resolves the problem of unstable and excessive contact resistance of the original rotary isolation switch, and addresses partial discharge problems during switch breakpoint production by installing shielding and voltage equalization covers on each contact.

5. The gas-insulated switchgear is convenient in terms of application and arrangement. It can be used as an independent unit, meeting various main wiring requirements through combination. The unit can be delivered to the site, reducing on-site installation time and improving reliability.

12KV 3150A Switchgear Breaking Isolation Cabinet Medium Voltage Switchgear 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 relay

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

12KV 3150A Switchgear Breaking Isolation Cabinet Medium Voltage Switchgear 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

12KV 3150A Switchgear Breaking Isolation Cabinet Medium Voltage Switchgear Basic Scheme

Operation Condition

Technical Parameter

Grounding and Separation

The C-GIS gas-insulated high-voltage switchgear comes in various current levels, including 630A, 1250A, 1600A, 2000A, 2500A, 3150A, etc. The size of the cabinet can be customized according to specific requirements. The outer casing is made from an aluminium zinc-coated plate cut and bent, while the gas box is welded using high-quality stainless steel plates made of 304. Each unit can be expanded and combined independently based on the design plan. The cabinet is divided into sections, including a secondary control room, busbar room, circuit breaker room, circuit breaker operating mechanism room, and cable room. The cable connection height can reach up to 700mm, making it convenient for maintenance and installation. The cabinet also features a comprehensive grounding protection system. The switchgear comprises isolated functional compartments such as switch rooms, busbar rooms, cable rooms, and secondary circuit channels. Each functional compartment is separated by a grounding metal partition, ensuring independence.

Secondary control room

The secondary control room is located above the cabinet, consisting of installation boards and brackets used to fix various components. This room allows for wiring terminals, small busbar terminals, protection devices, and other control and operation devices. Its purpose is to enable the system's remote control, telemetry, remote signalling, and local monitoring functions. Circular holes on the left and right side panels and terminals make connecting the cabinet with small busbars easier.

Bus Compartment

The upper air box contains the busbar room and the isolation mechanism. Once the cabinet is positioned on the ground support, the left and right circuit cabinets and busbars are securely joined together by merging the cabinets.

Switch Room

The switch room is in the centre of the cabinet and has a plate-type gas-insulated switch cabinet design with two chambers, one on top and one on the bottom. The upper chamber contains a three-position isolation switch, while the lower chamber houses a vacuum circuit breaker. The busbar, isolation switch, and circuit breaker are arranged vertically. The single chamber design is simple, inexpensive, and easy to produce, but it has lower reliability due to the components' proximity and potential to affect each other. On the other hand, the multi-chamber structure allows for easy replacement of individual modules, preventing the mutual influence of multiple components and ensuring high safety. However, the multi-chamber structure is more complex, challenging to manufacture, and costly.

Institutional Room

The spring system is flat, with the isolation and circuit breaker systems being kept separate. It is integrated with the insulation rod of the vacuum arc extinguishing chamber, making the transmission process more streamlined. The mechanism's output features align more closely with the circuit breaker's opening and closing attributes, resulting in lower power usage and enhanced mechanical dependability and adaptability.

Cable Room

Underneath the cabinet lies the cable room, which features its separate pressure relief path. The distance from the ground to the cable connection terminals can extend to 700mm. In adherence to regulations, grounding interlocks are implemented within the cable room, allowing for the installation of two cables and lightning arresters in each circuit. Additionally, the incoming and outgoing cables and the lightning arresters are connected using an internal cone insertion technique.