40.5KV 3150A Main Transformer Incoming Cabinet High Current High Voltage Switchgear

Embark on a journey of advanced power management with Kexunan's 40.5KV 3150A Main Transformer Incoming Cabinet High Current High Voltage Switchgear. Engineered for durability and easy maintainability, our switchgear, proudly presented by Kexunan, is a testament to cutting-edge technology. Its robust design ensures longevity, and the easy-maintainable features simplify upkeep, guaranteeing operational efficiency. For a comprehensive understanding of our offerings and to experience the durability and user-friendly maintenance of our switchgear, contact us today. Choose Kexunan for a reliable, durable, and easy-maintainable solution, redefining excellence in high voltage technology.

1. Due to the use of sulfur hexafluoride gas with insulation performance as an insulation and arc extinguishing medium, the volume of the switchgear can be significantly reduced, making it more compact and achieving miniaturization.
2. The conductive part of the high reliability and safety main circuit is sealed in SF6 gas, and the high-voltage live conductor is enclosed, which is not affected by external environmental conditions, ensuring long-term safe operation of the equipment and high reliability.
3. And there is no risk of electric shock or fire.
4. Independent modular design, the air box is made of high-precision aluminum plate and can be disassembled. The isolation switch adopts a three-position linear transmission. To reduce the control relay and circuit chaos, an additional control module with nearly 100 points of PLC is designed to achieve grounding, isolation switch, and all-electric remote operations. The mechanism switch has a modular design. The opening and closing points are connected with plum blossom contacts, Eliminating the possibility of non-operation of the original rotary isolation switch and grounding switch, changing the problem of unstable and excessive contact resistance of the original rotary isolation switch, and installing shielding and voltage equalization covers on the outside of each contact to solve the partial discharge problem in the production of switch breakpoints.
5. The application and arrangement of gas-insulated switchgear are convenient. As an independent unit, it can meet the requirements of various main wiring through combination. Delivering to the site in the form of units can shorten the on-site installation period and improve reliability.

40.5KV 3150A Main Transformer Incoming Cabinet High Current High 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

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

40.5KV 3150A Main Transformer Incoming Cabinet High Current High Voltage Switchgear Operation Condition

40.5KV 3150A Main Transformer Incoming Cabinet High Current High Voltage Switchgear Technical Parameter

Grounding and Separation

The C-GIS gas-insulated high-voltage switchgear is divided into current levels of 630A, 1250A, 1600A, 2000A, 2500A, 3150A, etc. The cabinet size can be customized according to needs. The outer shell is cut and bent from an aluminum zinc-coated plate, and the gas box is welded from 304 high-quality stainless steel plates. Each unit can be independently expanded and combined according to the design scheme. The cabinet is divided into a secondary control room, busbar room, circuit breaker room, circuit breaker operating mechanism room, and cable room. The cable connection height can reach 700mm, which is convenient for maintenance and installation.

The cabinet has a complete grounding protection system. The switchgear consists of isolated functional compartments such as switch rooms, busbar rooms, cable rooms, and secondary circuit channels. A grounding metal partition separates each functional compartment and has independence.

Secondary control room

The secondary control room is directly above the cabinet, with component installation boards and terminal block fixing brackets. It can install wiring terminals, small busbar terminals, comprehensive protection devices, and other control and operation devices to achieve the system's remote control, telemetry, remote signaling, and local monitoring functions. Circular holes for connecting small busbars at the corresponding positions of the left and right side panels and terminals facilitate cabinet connection. (Screenshot of the secondary box section)

Bus Compartment

The busbar room is enclosed inside the upper air box and in the same air box as the isolation mechanism. After the cabinet is placed on the ground support, the left and right circuit cabinets and busbars are tightly connected through cabinet merging.

Switch Room

The switch room is in the middle of the cabinet, a plate-type gas-insulated switch cabinet structure with two upper and lower chambers. The upper chamber has a three-position isolation switch, and the lower chamber has a vacuum circuit breaker. The busbar, three-station isolation switch, and vacuum circuit breaker are arranged in an "up, middle, and down" manner. The single chamber structure is simple, easy to manufacture, and cheap. When the single chamber components are together, they easily affect each other and have lower reliability. The multi-chamber structure module is easy to replace, avoids multiple components' mutual influence, and has high safety. However, the multi-chamber structure is complex, difficult to manufacture, and costly.

Institutional Room

The spring operating mechanism is arranged in a plane, and the isolation and circuit breaker mechanisms are independently separated. The mechanism is integrated with the insulation rod of the vacuum arc extinguishing chamber before and after, simplifying the transmission process. The output characteristics of the mechanism are more in line with the opening and closing characteristics of the circuit breaker, reducing power consumption and improving mechanical reliability and flexibility.

Cable Room

The cable room is below the cabinet and has an independent pressure relief channel. The height of the cable connection terminals to the ground can reach 700mm. Grounding interlocks are installed in the cable room according to requirements, and two cables and lightning arresters can be installed in each circuit. Moreover, the incoming and outgoing cables and lightning arresters are connected using an internal cone insertion method.