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40.5KV 1250A Power Distribution Cabinet Gas Insulated Switchgear

40.5KV 1250A Power Distribution Cabinet Gas Insulated Switchgear

In recent years, the engineering construction landscape has evolved in response to societal, economic, and technological advancements. There is a mounting interest in compact switchgear that exhibits intelligence and reduced maintenance requirements. Domestic and international manufacturers are vigorously developing 40.5KV 1250A Power Distribution Cabinet Gas Insulated Switchgear, also known as gas-insulated switchgear (C-GIS), which encases high-voltage components like busbars, circuit breakers, isolating switches, and power cables within a pressure-reduced shell.

Model:gas insulation electrical switchgear

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Product Description

Product Features

1. By using sulfur hexafluoride gas as a shielding and arc extinguishing medium, the dimension of the switchgear can be greatly minimized, resulting in an extra small and smaller sized layout.

2. The conductive part of the primary circuit, which is very reliable and safe, is sealed in SF6 gas, keeping the high-voltage online conductor enclosed and unaffected by outside aspects. This makes sure long-lasting secure operation and high dependability of the devices.

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

4. The 40.5KV 1250A Power Distribution Cabinet Gas Insulated Switchgear is created with an independent modular structure, with the air box made of high-precision light weight aluminum plate and can be taken apart. The isolation button takes on a linear transmission with 3 positions. To decrease control relay and circuit complication, an added control module with virtually 100 PLC points is consisted of for grounding, isolation button, and remote procedures. The mechanism button is modular, attaching opening and closing factors with plum bloom contacts. This eliminates the possibility of non-operation in the initial rotary isolation button and basing button, deals with the issue of unsteady and excessive get in touch with resistance in the initial rotating seclusion button, and includes shielding and voltage equalization covers on each get in touch with's outside to deal with partial discharge problems during button breakpoints production.

5. The gas-insulated switchgear is convenient to use and arrange. It can be used as an independent unit and meet various major electrical wiring demands through mix. Delivering it to the site as systems can shorten on-site installation and boost dependability.

Execution standards

IEC 62271-200: 2011 High-voltage switchgear and controlgear - Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

IEC 62271-102:2013 6.2 High-voltage switchgear and controlgear - Part 102: Alternating current disconnectors and earthing switches

IEC 62271-100: 2017.6.2 High-voltage switchgear and controlgear - Part 100: Alternating-current circuit-breakers

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

Operation Condition

Technical Parameter

Grounding and Separation

The 40.5KV 1250A Power Distribution Cabinet Gas Insulated Switchgear is available in a range of current capacities, including 630A, 1250A, 1600A, 2000A, 2500A, 3150A, and more. The cabinet's size can be tailored to meet specific requirements. The exterior is constructed from aluminum zinc-coated plates, while the gas box is made from high-quality 304 stainless steel plates, welded for durability. The units can be expanded and combined independently, according to design specifications. The cabinet is divided into several rooms, including a secondary control room, busbar room, circuit breaker room, circuit breaker operating mechanism room, and cable room. The cable connection height is up to 700mm, facilitating maintenance and installation. The cabinet also features a comprehensive 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, ensuring independent operation.

Secondary control room

The cabinet is positioned right under the secondary control room and is equipped with panels for setting up parts and supports for securing terminal blocks. Within the secondary control room, there is space to set up different equipment like wiring terminals, small busbar terminals, and extensive protection devices. These tools help the system carry out tasks like remote control, telemetry, remote signaling, and on-site monitoring. Circular openings on the side panels and terminals simplify the connection of the cabinet with small busbars.

Busbar Compartment

The upper air box houses both the busbar room and the isolation mechanism. When the circuit cabinets are placed on the ground support, they are securely connected to each other through cabinet merging, with busbars on both sides.

Switch Room

The 40.5KV 1250A Power Distribution Cabinet Gas Insulated Switchgear features a plate-like design comprising two chambers arranged vertically in the cabinet's center. The upper chamber houses a three-position isolation switch, while the lower one contains a vacuum circuit breaker. This layout offers a straightforward and cost-effective single-chamber structure but comes with reduced reliability due to the components' close placement. In contrast, the multi-chamber design enhances safety by preventing component interference and facilitating easier maintenance but is a more intricate, costly, and difficult-to-produce alternative.

Institutional Room

The spring-driven system is located on a level surface, with the isolation and circuit breaker mechanisms functioning separately. It is connected to the insulation rod of the vacuum arc extinguishing chamber both before and after, streamlining the transfer process. The system's performance closely matches the circuit breaker's ability to open and close, leading to lower energy consumption and improved mechanical dependability and versatility.

Cable Room

The cabinet is positioned above the cable room and features a distinct pressure relief pathway. The vertical distance between the ground and the cable connection terminals can reach up to 700mm. As required by regulations, grounding interlocks are incorporated in the cable room, enabling the installation of two cables and lightning arresters in each circuit. Additionally, the internal cone insertion method secures the connection between the incoming and outgoing cables and lightning arresters.

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