12KV 630A Potential Transformer Switchgear Busbar PT Cabinet Medium Voltage Switchgear

Unleash the power of seamless energy management with Kexunan's 12KV 630A Potential Transformer Switchgear Busbar PT Cabinet Medium Voltage Switchgear. Crafted for durability and easy maintainability, our switchgear solutions, proudly introduced by Kexunan, stand at the forefront of medium voltage technology. The robust design ensures enduring performance, while the easy-maintainable features simplify upkeep, ensuring consistent and reliable operations. For a detailed exploration of our offerings and to experience the durability and user-friendly maintenance of our switchgear, reach out to us today. Choose Kexunan for a reliable, durable, and easy-maintainable solution, redefining excellence in medium voltage technology.

In the past few years, as society and the economy continue to evolve and switch technology advances, the complexity of engineering construction has grown. There is a growing preference for switch equipment that is small in size, requires little maintenance, and is intelligent. Both local and international switch manufacturing companies are actively developing medium voltage gas-filled cabinets (C-GIS), also known as gas-insulated switchgear. This term refers to enclosing high-voltage components such as busbars, circuit breakers, isolating switches, and power cables within a shell with lower gas pressure.

1. The switchgear can be made more compact and smaller by utilizing sulfur hexafluoride gas as an insulating and arc extinguishing medium.

2. The main circuit's conductive part, which ensures high reliability and safety, is sealed in SF6 gas, protecting it from external environmental factors and ensuring long-term safe operation.

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

4. The switchgear features an independent modular design, with a disassemblable air box made of a high-precision aluminium plate. The isolation switch adopts a three-position linear transmission, reducing control relay and circuit confusion. Additionally, a control module with nearly 100 points of PLC is included for grounding, isolation switch, and all-electric remote operations. The mechanism switch is designed with modularity, using plum blossom contacts for opening and closing points. This design eliminates the possibility of non-operation and unstable contact resistance, and shields and voltage equalization covers are installed on each contact to address partial discharge during switch breakpoint production.

5. The gas-insulated switchgear allows for convenient application and arrangement. It can be combined to meet different main wiring requirements as an individual unit. Delivering the switchgear in units shortens the installation period on-site and enhances reliability.

12KV 630A Potential Transformer Switchgear Busbar PT 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 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

12KV 630A Potential Transformer Switchgear Busbar PT 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

Basic Scheme

12KV 630A Potential Transformer Switchgear Busbar PT Cabinet Medium Voltage Switchgear Operation Condition

12KV 630A Potential Transformer Switchgear Busbar PT Cabinet Medium Voltage Switchgear 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 as per requirements. The outer shell is made from a plate coated with aluminium zinc, and the gas box is welded using high-quality stainless steel plates (304 grade). Each unit can be expanded and combined independently based on 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 height of the cable connection can reach 700mm, making maintenance and installation convenient. The cabinet is equipped with a comprehensive grounding protection system. It comprises separate functional compartments, including 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

Above the cabinet is a secondary control room with boards for installing components and brackets for fixing terminal blocks. This control room allows for the installation of wiring terminals, small busbar terminals, comprehensive protection devices, and other control and operation devices. These installations 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 it easier to connect the cabinet.

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 through cabinet merging.

Switch Room

The switch room is at the centre of the cabinet and consists of a plate-type gas-insulated switch cabinet with two chambers, one on top and one below. The upper chamber contains a three-position isolation switch, while the lower chamber houses a vacuum circuit breaker. The arrangement of the busbar, isolation switch, and circuit breaker follows a hierarchical pattern. The single chamber structure is simple, inexpensive, and easy to produce, but it has a drawback of components easily affecting each other, resulting in lower reliability. On the other hand, the multiple advantages of easy replacement prevent the mutual influence of multiple components, leading to higher safety. However, the multi-chamber structure is complex, challenging to manufacture, and comes at a higher cost.

Institutional Room

The spring mechanism for operation is positioned in a flat configuration, while the mechanisms for isolation and circuit breaking are kept separate. This integration with the insulation rod of the vacuum arc extinguishing chamber both before and after simplifies the transmission process. The mechanism's output characteristics are better aligned with the circuit breaker's opening and closing traits, reducing power usage and enhancing mechanical reliability and flexibility.

Cable Room

The cabinet is above the cable room and has a separate pressure release pathway. The distance from the ground to the cable connection terminals can be as much as 700mm. To comply with regulations, grounding interlocks are set up in the cable room, and each circuit can accommodate two cables and lightning arresters. The internal cone insertion technique is also used to connect the incoming and outgoing cables and lightning arresters.