Product Details

Product name: GCK low voltage equipment

Detailed description:

GCK type low-voltage withdrawable switchgear (hereinafter referred to as switchgear) is suitable for three-phase four-wire system and three-phase AC 50, (60) Hz, rated voltage 380 (400) V, 660 (690) Vf rated current 5000A and below The three-phase five-wire power system is widely used in power plants, substations, industrial and mining enterprises, high-rise buildings, airports, stations and terminals, and radio and television communication centers, as power distribution for power generation, transmission and distribution, power conversion and power consumption PC and Motor Control Center MCC in the.

This product has passed the CCC certification of the National Quality Certification Center.

Use environment

1. The ambient air temperature is not higher than +40℃, not lower than -5℃, and its average temperature within 24 hours is not higher than +35℃;

2. When the relative humidity of the surrounding air is +40℃, it does not exceed 50℃, and the maximum relative temperature is allowed at lower temperatures, such as 90℃, but it should be considered that moderate condensation may occur due to temperature changes;

3. For indoor use, the altitude of the place of use shall not exceed 2000m;

4. It should be installed in a place where there is no severe vibration and impact, and where the electrical components are not corroded.

Product series and main specifications

Technical data

Main circuit scheme

The main circuit scheme of the switchgear has 34 groups and 47 specifications, but does not include derivative schemes and specifications due to changes in auxiliary circuit control and protection.

Structural features

1. The basic frame of the switch cabinet is a combined assembly structure. The entire structure of the cabinet frame is fastened and connected by self-tapping screws, plus doors, partitions, sealing plates, brackets, bus bars, drawers and electrical components to form a complete set Switch cabinet. Because the original GCKI frame uses GF28 profile, the steel plate of this profile is relatively thin, and when the profile is galvanized, there are dead corners in the inner part, which greatly shortens the service life of the cabinet, and at the same time considers its overall structure. Our company boldly improved the standardization and other factors, using C-shaped special profiles, using 25mm as the modulus and bending of 2mm thick steel plate, plus all the use of strong self-tapping screws during assembly. Rugged, making the combination more flexible and convenient, and the service life longer.

2. The switch cabinet adopts modular design, and the cabinet is divided into three areas. The top is the busbar area, the front is the electrical area, and the back is the cable outlet area. The electrical area and the cable area are separated by steel plates to ensure the normal operation of the line and effectively prevent the expansion of the fault. When the electrical components are pulled out of the cabinet, the cabinet All charged objects are not exposed, so it is safer and more reliable for users to use. For the feeder cabinet, the width of the cabinet is 600mm, and up to 9 or 18 feeder circuits can be installed. (18 feed circuits are only applicable to load units with a capacity of less than 63A)

3. According to the characteristics of the switch cabinet, it can be divided into power receiving cabinet, PC cabinet (power center), MCC cabinet (motor control center), and capacitor compensation cabinet.

4. The drawers of the same functional unit can be interchanged. Once a failure occurs, the unit is pulled out and the spare drawer is inserted to send power. This greatly shortens the time of power outage due to the failure and improves the reliability of the equipment.

5. The switch cabinet can be designed as a mixed type of fixed cabinet and drawer cabinet, or it can be a drawer type that not only retains the simplicity, practicality, and low price of fixed cabinets, but also has the advantages of small drawers, strong functions, and easy replacement.

6. In order to ensure the operating procedures and the personal safety of maintenance personnel, a mechanical interlocking mechanism is set in the switch cabinet, and a mechanical interlocking mechanism is set up for the drawer unit, the door and the main switch, making it more reliable to use.

7. The drawer height of the switchgear is divided into four standard sizes, namely: 1 unit/2, 1 unit, 2 unit, 3 unit, its structure is light and handy, it is easy to assemble, the layout is reasonable, and it has three positions for working, testing and isolation.

8. The N and PE wires of the switch cabinet are at the back and bottom of the closed cabinet, and the PE wires are connected with the cabinet frame, which not only makes the connection of the outlet cables more convenient, but also makes the grounding more reliable.

9. Without reducing the protection level, the top of the switch cabinet and the upper and lower ventilation doors are equipped with ventilation systems.

Circuit component selection

The components in the switchgear are mainly selected with advanced technical performance indicators or imported technology, domestic electrical components that have been mass-produced.

1. Main switch

630A and above power inlet and feeder switch, the main selection is TGW45 series or HSW1, CM1(2), CW1(2) RMW1 series. At the same time, according to the needs of users, imported MT series, E series or NZW series can also be selected.

2. For feeder and motor control shutoffs below 630A, CM1 series and HSM1 series are mainly used. According to user needs, imported NS series, T series and other plastic case circuit breakers can also be used.

3. AC contactors mainly choose B or A series, LC1 series, 3TB series contactors, as well as matching thermal circuit breakers and interlocking mechanisms.

4. The circuit transformer chooses ALH series, BH series, SDII series, LMZ1 series.

5. The fuse selects the NTOO series with high breaking capacity.

Dimensions and installation

Dimensions

Technical Parameter