Low voltage extraction switchgear GCS

GCS low-voltage extraction switchgear is suitable for power distribution systems in power plants, petroleum, chemical industry, metallurgy, textile, high-rise buildings and other industries. In places with high degree of automation such as large power plants and petrochemical systems, where computer interface is required, it is used as a three-phase AC frequency of 50 (60) Hz, rated working voltage of 380V (400V), (660V), rated current of 4000A and below. Low-voltage complete sets of power distribution devices used for power distribution, motor centralized control, and reactive power compensation in power generation and power supply systems.

performance index

The design of the device meets the following standards
IEC439-1 Low voltage switchgear and control equipment
GB7251 low voltage switchgear
ZBK360001 low voltage extraction switchgear

main structure

The main frame adopts 8MF type open steel, and the two sides of the steel have installation holes with modulus of 20mm, 100mm and 9.2mm respectively, which is flexible and convenient for internal installation.
The main frame assembly form is designed as two types, fully assembled structure and part (side frame and beam) welded structure, for users to choose.
The functional rooms of the device are isolated from each other, and the compartments are divided into functional unit rooms, bus rooms and cable rooms. The functions of each room are relatively independent;
The horizontal main busbar adopts the flat arrangement mode behind the cabinet to enhance the ability of the busbar to resist electric power, which is the basic measure to make the main circuit of the device have the ability of high short-circuit strength;
The design of the cable compartment makes it very convenient for cables to enter and exit up and down.
The size of the general cabinet for the installation (see the table below)

functional unit

● The modulus of the drawer floor height is 160mm. It is divided into 1/2 unit, 1 unit, 3/2 unit, 2 unit, 3 unit, and five size series. The unit circuit rated current is 400A and below.
● The drawer changes only in height and size, and its width and depth dimensions remain unchanged. Drawers of the same functional unit have good interchangeability.
● Each MCC cabinet can be installed with up to 11 one-unit drawers or 22 1/2-unit drawers. More than one unit of drawers adopts a multi-functional rear panel.
● The drawer inlet and outlet lines adopt plug-ins with the same specification chip structure with different numbers of pieces according to the current.
● The adapter between the 1/2 unit drawer and the cable compartment adopts the ZJ-2 type adapter of the back plate structure.
● Unit drawer and cable compartment according to the current transfer using the same size rod or tube structure ZJ-1 type adapter.
● The drawer unit is equipped with a mechanical interlock device.

Main electrical components

The principle of selecting main electrical components is based on imported technology, which can be mass-produced in series in China and meet the requirements of high performance of the device.
● The main choice of power supply and feeder unit circuit breaker is AH series. Other more advanced performance M series produced by Schneider Company and F series produced by ABB Company can also be selected. AH type circuit breaker has the characteristics of good performance, compact structure, light weight and strong seriousness. The price is relatively low, the maintenance and use are convenient, and the performance indicators can meet the requirements of this device.
● Drawer unit (motor Control Unit, part of the feed unit) circuit breakers mainly choose CM1, TG, TM30 series molded case circuit breakers, and some choose NZM-100A series produced by MOELLER. These switches have the characteristics of good performance, compact structure, short or no arc, and high technical and economic indicators, which can meet the requirements of this device.
● Isolation switch and fuse type isolation switch choose Q series. This series has high reliability, strong breaking capacity, and can realize mechanical interlocking.
● Fuse main selection NT series.
AC contactor selection B series, LC1-D series.

Device features

Increase the heat capacity of the adapter and greatly reduce the additional temperature rise caused by the temperature rise of the adapter to the connector, cable head and spacer.
The separation between functional units and compartments is clear and reliable, and the failure of one unit does not affect the work of other units, limiting the failure to a minimum.
The busbar flat arrangement makes the device have good dynamic and thermal stability, and can withstand the impact of 80/176 kA short-circuit current.
● The number of circuits in a single cabinet of MCC cabinets is as large as 22 times, fully considering the needs of automated electric door (machine) groups in industries such as large single-unit capacity power generation and petrochemical systems;
The connection between the device and the external cable is completed in the cable compartment, and the cable can enter and exit up and down; the current transformer is installed in the cable compartment, making installation and maintenance convenient;
● The same power distribution system can limit the short-circuit current through limited viewership of reactor matching, stabilize the bus voltage at a certain value, and partially reduce the requirements for short-circuit strength of components;
The drawer unit has a sufficient number of secondary connectors (32 pairs for 1 unit and above, 20 pairs for 1/2 unit), which can meet the requirements of the number of docking points for computer interfaces and automatic control circuits.

Auxiliary circuit

The design of the auxiliary circuit diagram conforms to the "Technical Regulations for Power Design of Thermal Power Plants" and other relevant design technical regulations. It is suitable for low-voltage power plant (premises) power systems in power plants and substations, and low-voltage power distribution systems in factories, mines and high-rise buildings.
The auxiliary circuit scheme is designed according to the main circuit scheme, which is divided into functional units of power input line, feeder line (PC) and motor feeder line (MCC) operation control.


Installation and use


After the product arrives at the place of receipt, it should first check whether the packaging is complete and intact. If any problems are found, the relevant departments of the contract should be notified in time to make business records, jointly analyze the reasons, and make visa and aftermath treatment. For
Installed products should be placed in an appropriate location and properly stored according to normal operating conditions and electrical equipment temporary storage procedures.
● The installation of the product should be carried out according to the installation schematic diagram (see attached drawings). The basic channel steel and the bolts when the bolt fixing method are provided by the user. When the main busbar is connected, if the surface is uneven due to transportation and storage, etc., it is necessary to
Connect and tighten after leveling;
When the device is installed alone or in a row, its verticality and the deviation of the unevenness of the cabinet surface and the gap between the cabinets shall comply with the following table.

● Inspection and inspection before the product is installed and put into operation


O Check whether the cabinet topcoat or other covering materials (such as plastic spraying) are damaged, and whether the cabinet is dry and clean;
O whether the operating mechanism of the electrical components is flexible, and there should be no jamming or excessive operating force.
O Whether the on-off of the main and auxiliary contacts of the main electrical appliances is reliable and accurate;
O drawer or pull-out mechanism should be flexible, lightweight, and free of jamming and collision.
O The center line of the moving and static contacts of the drawer or the drawer structure should be the same, and the contact contact should be tight. The insertion depth of the main and auxiliary contacts should meet the requirements. Mechanical interlocking or electrical interlocking devices should be operated correctly, locking or
Release should be reliable.
O Drawers of the same size should be easily interchangeable, free from jamming and collision.
O The ground contacts between the drawer and the cabinet should be in close contact. When the drawer is pushed in, the ground contacts of the drawer contact first than the main contacts, and when pulled out, the ground contacts are disconnected after the main contacts.
O instrument scale setting, transformer ratio and polarity should be correct;
O fuse core specifications should meet the requirements of engineering design;
O protection rating and setting should be correct, reliable action;
O The insulation resistance value measured by a 1000V megohm meter shall not be less than 1MΩ;
O The connection of each busbar should be good, and the installation of insulating supports, mounting parts and other accessories should be firm and reliable.


● Precautions for use


The O device is a low-voltage distribution cabinet that is not installed against the wall, operated on the front, and repaired on both sides. The maintenance channel and cabinet door of the cabinet must be entered or opened by qualified professionals for operation, inspection and maintenance.
O air circuit breakers and molded case circuit breakers have been divided and combined for many times, especially after short-circuit division and combination, which will cause local burns on the contacts and produce carbon-based substances, which will increase the contact resistance. You should follow the circuit breaker instruction manual
Perform maintenance and overhaul.
O After installation and maintenance, the isolation between compartments and functional units must be strictly checked to ensure the good functional separation of the device and prevent the failure from expanding.


Product package


The manufacturer shall provide the following documents and attachments when supplying goods:
Device list;
● Product certificate;
Instructions for use;
● Factory test report;
Electrical drawings;
● Cabinet door keys, operating handles and spare parts stipulated in the contract;
● Installation and operation instructions for the main components.

基本参数