12KV 1250A Customized Medium Voltage Electrical Switchgear

Standards compliant:

GB3906-2006 "3.6~40.5kV AC metal-enclosed switchgear and control equipment"

GB11022-89 "General Technical Conditions for High Voltage Switchgear"

IEC298(1990) "AC metal-enclosed switchgear and control equipment with rated voltages above 1kV and 50kV and below"

DL404-97 "Technical Conditions for Ordering Indoor AC High Voltage Switchgear"

Normal usage environment

◆Surrounding air temperature: maximum temperature+40 ℃, minimum temperature -15 ℃;

◆Relative humidity: Daily average relative humidity: ≤ 95%, daily average water vapor pressure does not exceed 2.2KPa; Monthly average relative humidity ≤ 90%; The monthly average water vapor pressure does not exceed 1.8KPa; Altitude: ≤ 1000m;

◆Earthquake intensity: not exceeding level 8;

◆The surrounding air should not be significantly polluted by corrosive or combustible gases, water vapor, etc;

◆No places with severe vibration;

◆When using beyond the normal conditions specified in GB3906, the user and our company shall negotiate

12KV 1250A Customized Medium Voltage Electrical Switchgear Functions and features

The 12KV 1250A Customized Medium Voltage Electrical Switchgear is crafted in accordance with the armored metal-enclosed switchgear standards outlined in GB3906-91. It consists of two primary components: the cabinet and the central pull-out part, also known as the handcart. The cabinet is divided into four distinct compartments. The enclosure protection level is IP4X, while the doors of each small compartment and the circuit breaker room offer IP2X protection when opened. The switchgear features overhead incoming and outgoing lines, cable incoming and outgoing lines, and various functional solutions. Once arranged and combined, it forms a comprehensive power distribution system device. The switchgear can be installed, debugged, and maintained from the front, allowing for back-to-back, double, and wall installations, which enhances safety, flexibility, and space efficiency.

Main technical parameters of 12KV 1250A Customized Medium Voltage Electrical Switchgear

Main technical parameters of vacuum switchgear

If the starting current of the 3-10KV motor controlled breaker is below 600A, it is necessary to include a metal zinc oxide lightning arrester. The user and our company agree on the particular conditions, which stipulate that when the circuit breaker is used for disconnecting the capacitor bank, the capacitor's rated current should not go over 80% of the circuit breaker's rated current.

Technical parameters of operating mechanism

The 12KV 1250A Customized Medium Voltage Electrical Switchgear is developed according to the armored steel confined switchgear in GB3906-91. The whole is composed of two mainparts: a cabinet and a central with drawable spare component (i.e. a handcart) (see Figure 1). The closet is separated right into 4 separate compartments, with an enclosure protection degree of IP4X. When the doors of each compartment and breaker room are opened, the defense level is IP2X. Equipped with overhead incoming and outbound lines, wire inbound and outgoing lines, and various other functional schemes, organized and combined to create a full collection of power circulation system gadgets. This switchgear can be mounted, debugged, and preserved from the front, so it can be back-to-back, arranged in a dual arrangement, and installed against the wall surface, enhancing the security, flexibility, and lowering the impact of the switchgear.

◆ Shell and others

The primary frame of the switchgear is made of light weight aluminum zinc thin steel plate, processed by CNC maker tool, and takes on numerous folding procedure, which not just has the advantages of high precision, strong corrosion resistance and oxidation resistance, yet likewise makes the cupboard lighter in weight, greater in mechanical toughness, and more aesthetically pleasing in appearance compared to other comparable equipment closets because of the use of numerous folding process. The cabinet takes on a put together structure, linked by rivet nuts and high-strength screws, which shortens the handling cycle, enhances the universality of elements, occupies much less area, and is convenient for organizing manufacturing.

◆ Handcarf

The handcart framework is constructed from slim steel plates processed by CNC equipment devices. The handcart and closet are shielded and coordinated, and the interlacing device is risk-free, trusted, and versatile. According to their use, handcart can be divided into circuit breaker handcart, voltage transformer handcart, metering handcart, isolation handcart, and various other kinds of handcart. According to module and block kind variations, handcart of the very same specification can be openly traded 100%. The handcart has an interference placement, a testing position, and a functioning position inside the closet. Each placement is outfitted with a positioning tool to make certain trusted interlocking. The operation must be executed according to the interlocking security actions operation treatment. All handcart utilizes nuts and screws to move and leave, and its operation is light and flexible, suitable for working employees to operate. When the handcart demands to be moved far from the cabinet, a dedicated transfer car can be easily taken out for different examinations and maintenance, And it embraces a mid mounted style, with a little volume for evaluation, maintenance, and comfort.

◆ Area

The main electric parts of the switchgear have independent areas, namely: circuit breaker handcart space, busbar room, cable television space, relay instrument area. The security degree between each compartment reaches lP2x; With the exception of the relay, all other 3 layouts have their very own stress relief channels. Because of using a main design, the cord area space is greatly increased, permitting the tools to link multiple cables.

◆ Circuit breaker Compartment

Tracks are mounted on both sides of the compartment for handcart 5 to relocate and slide from the disconnected position and test position to the functioning setting inside the cupboard. The partition 3 (shutoff) of the fixed call box 16 is set up behind the rear wall of the handcart area. When the handcart relocates from the separated position test placement to the functioning placement, the flaps on the top and reduced fixed contact boxes are linked with the handcart and instantly open. When moving in the contrary direction, the flaps immediately close up until the handcart go back to a certain setting and totally covers the fixed contact box, creating effective isolation. As a result of the separate operation of the top and lower valves, throughout maintenance, the valve on the live side can be secured to ensure that upkeep workers do not touch the real-time body. When the circuit breaker space door is closed, the handcart can additionally be operated.

Via the monitoring window of the center door, the placement of the handcart being thrown away and enclosed the compartment can be observed, and the power storage space status can be displayed.

◆ Busbar Compartment The major busbar 18 is a solitary unit spliced and linked per various other, repaired by the primary busbar 20 and the static contact box. The main busbar and linking busbar are copper bars with rectangular cross-sections, made use of for high currents. When composite, double busbars are made use of to construct them. The branch busbar is linked to the fixed call box 16 and the major busbar through bolts and does not call for any other assistance. For unique demands, the busbar can be covered with warm diminish tubing, insulation sleeves with linking bolts, and end caps. Surrounding cupboard busbars are fixed with sleeve 19, to ensure that the air barrier preserved between the linking busbars can avoid melting in case of internal mistake arcs. Sleeve 19 can successfully restrict crashes to this cupboard and not infect various other cupboards.

Overall dimensions

Installation of switchgear

Schematic diagram of switchgear structure

◆ The adhering to diagram reveals the structural parts of the switchgear. All steel modular assembly structure, the cupboard body is made from imported aluminum zinc layered plate with strong anti-corrosion capacity, without surface area therapy. It is refined by CNC high-precision devices and adopts sophisticated several folding process. The link is gotten in touch with rivet nuts and high-strength screws, with high accuracy, light weight, and excellent strength.

◆ The switchgear can be outfitted with our company's VS1 collection, VD4 collection, ZN65 collection and other vacuum breaker, with broad applicability and solid interchangeability. The handcart is outfitted with a functioning position, a screening placement, and positioning and display devices at each placement, making certain safety and dependability.

◆ The cable television room can accommodate approximately 9 solitary core cords, and the equipment is equipped with reputable mechanical and electric interlocking gadgets, fully meeting the "five avoidance" demands. Each space is outfitted with stress alleviation channels to ensure individual safety during operation.