GCS low voltage withdrawable switchgear

Overview

This product is suitable for low-voltage power distribution systems in power plants, petroleum, chemical, metallurgy, textile, high-rise buildings and other industries. In large power plants, petrochemical systems and other places with a high degree of automation and requiring interface with computers, as three-phase AC, the rated working voltage is 380V, 660V, and the rated current is 4000A and below. Power distribution and motor control in the power supply system Central and reactive power compensation low-voltage complete power distribution devices. At present, GCS-type withdrawable switchgear has been widely used by power users. This device complies with GB7251, GBT14048.3, lEC439—1 and other standards.

 

 

Use ambient conditions

The ambient air temperature should not be higher than +40°C, not lower than -5°C, and the average temperature within 24 hours should not be higher than +35°C.

The relative humidity of the surrounding air should not exceed 50% at the highest temperature of +40°C, and a larger relative humidity is allowed at lower temperatures, such as 90% at +20°C. Occasional condensation effects.

The altitude does not exceed 2000M.

When the device is installed, the inclination from vertical should not exceed 5%, and the whole group of cabinets should be arranged relatively flat.

The device should be installed in a place where there is endless strong vibration and shock and where the electrical components are not enough to be corroded.

This device is suitable for transportation and storage in the following temperature range: -25°C to +55°C, not exceeding +70°C for a short period of time (24 hours).

Main technical parameters

 

 

Structural Features

The main frame of the device is made of 8MF steel, and the frame adopts two structural forms: assembled and partially welded. There are installation module holes E=20mm on the main frame.

Each functional room of the device is strictly separated, and its compartments are mainly divided into functional unit room, busbar room, and cable room, and the functions of each unit are relatively independent.

The device places the horizontal busbar behind the cabinet, so that there are outlet channels up and down the cable room.

Functional Unit

A. The module height of the drawer layer is 160mm, and it is divided into four size series: 1/2 unit, 1 unit, 2 unit and 3 unit. The rated current of the unit circuit is 400A and below.

B. The drawer only changes in height and dimension, and its width and depth remain unchanged; the drawers of the same functional unit have good interchangeability.

C. Each cabinet of the device can be equipped with 11 1-unit drawers or 22 1/2-unit drawers.

D. According to the size of the loop current, the input and output lines of the drawer use different numbers of the same standard chip connectors, generally a connector <200A.

The switch between the E.1/2 unit drawer and the cable room adopts the ZJ-2 type switch of backplane structure.

F. For the connection between the unit drawer and the cable room, the same standard chip connector with different number of pieces is used according to the current size, generally a connector is less than 200A.

G. The drawer panel has obvious signs of the position of making and breaking test, and the drawer is equipped with a mechanical interlocking device.

The feeder cabinet and the motor control cabinet are equipped with special cable compartments, and the connection between the functional unit compartment and the cables in the cable compartment is realized through adapters or adapter copper bars, which not only improves the reliability of the cables, but also greatly It is very convenient for users to install and maintain the cable.

The cable compartment has two width sizes (240mm or 440mm) to choose from, depending on the number of cables, cross-section and user's requirements for easy installation and maintenance.

The number of auxiliary contact pairs of functional units of the device is more than 32 pairs. 1/2 unit is 20 pairs. It can meet the needs of automation users and computer interfaces.

With the drawer as the main body, there are both withdrawable and fixed types, which can be mixed and combined, and can be selected arbitrarily.

The device is designed according to the three-phase five-wire system and the three-phase four-wire system. The design department and the user can easily choose the PE+N or PEN method.

The protection grade of the cabinet is IP30, IP40, which can be selected according to user needs.

Drawer operating handle function diagram

 

 

Busbar System

In order to improve the dynamic and thermal stability of the busbar and improve the temperature rise of the contact surface, the devices all use TMY-T2 series hard copper bars. The connection part of the copper bars must be tinned, and full-length tinned is recommended. Full-length silver-plated busbars are also available.

The horizontal busbar is placed in the busbar compartment at the rear of the cabinet. The upper and lower double layers are arranged for 31 50A and above, and the single layer arrangement is for 2500A and below. Each phase is composed of 4 or 2 busbars, which greatly improves the short circuit of the busbar. strength. (See Table 2)

The vertical busbar of the chest of drawers adopts “L” type hard copper tinned busbar. The busbar specification is (50×5)+(30×5), and the rated current is 1000A.

 

 

Dimensions and installation dimensions

 

 

Installation and maintenance

1 When the device arrives at the destination, first check whether the packing box is complete. If the device is not installed immediately, it should be stored in a dry and clean place.

2 The device is installed away from the wall. The installation foundation plane should be flat, the horizontal error of the foundation channel steel is 1/000, and the total length deviation is 3mm.

3 It is recommended to use grade 8 and 8 and tension washers for the bolt fixing method of all conductive parts. The recommended tightening torque is shown in Table 4.

4 After the cable is connected, the bottom of the device should be closed to prevent small animals from climbing into the cabinet and causing a short circuit accident.

5 Before the device is put into operation, the following inspections and tests shall be carried out:

A Check whether the electrical equipment and wiring inside the switch cabinet meet the requirements of the drawing, whether the wire ends are marked with numbers, and whether the wiring is neat and firm.

B Check whether the installed electrical equipment is in good contact and whether it meets the technical conditions of the electrical equipment itself.

C Whether the main contacts of the main electrical appliances are reliable and accurate

D Check the reliability of mechanical interlocks and electrical interlocks.

E Check whether the withdrawable components are flexible and contact well, and there should be no jamming or excessive operating force.

F Check whether the insulation resistance of the main circuit and the control circuit meets the specified requirements, and check and test whether the grounding device of the switch cabinet is reliable.

G Check and test all meters and relays for correct operation.

H Drawers of the same specification should be easily interchangeable without jamming and collision.

 

 

Transport and storage of the unit

The device can be hoisted or transported by forklift.

The device must not tip over and be subject to severe vibrations.

If the device needs to move a small distance when it is installed in place, it can be pryed on the four corners of the chassis.

Do not disassemble electrical products and parts in the device at will.

It should be protected from rain and damp, and the ambient temperature should be in accordance with the relevant regulations of this sample.

The completeness of the product

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The switchgear comes with packing list, product certificate, instruction manual, and necessary drawings. The random accessories include door keys and spare parts provided according to the matching list.

Instructions for ordering

Main wiring diagram scheme and secondary schematic diagram:

Switchgear arrangement diagram:

Distribution room floor plan Switchgear cabinet surface color:

Detailed specifications of main electrical components:

Other special requirements.

Main circuit scheme

This solution is the basic solution. If users have any differences, they can negotiate and resolve them.