Explosion proof self coupling voltage reducing starter 75KW explosion-proof cabinet

Explosion proof self coupling voltage reducing starter 75KW explosion-proof cabinet

Explosion proof autotransformer pressure reducing starter autotransformer pressure reducing starter
Product features of explosion-proof self coupling voltage reducing starter control cabinet
1. This product is suitable for infrequent starting and stopping of 13-95KW three-phase asynchronous motors.
2. Aluminum alloy or steel plate welded shell, surface sprayed with plastic.
3. It can be equipped with circuit breakers, AC contactors, time relays, thermal relays, current transformers, voltmeters, ammeters, transfer switches, indicator lights, etc.
4. The delay automatic control time relay can be adjusted within 0-60 seconds.
5. Applicable to uninterrupted work system or repetitive short-term work system, operating frequency under repetitive short-term work system
6. It has functions such as overload, short circuit, and phase failure protection.
7. It can be customized according to user requirements.
8. Both steel pipes and cables can be used for wiring.
9. Below 55kW (including 55kW) is an aluminum alloy shell, and above 55kW is a steel plate welded shell.
Scope of application of explosion-proof self coupling voltage reducing starter control cabinet
1. Zone 1 and Zone 2 hazardous areas.
2、IIA、IIB、IIC 类.

1. Suitable for hazardous areas in Zone 1 and Zone 2
2. Suitable for Class IIA and IIB explosive gas environments
3. The material of the box body is welded from ZL102 or Q235 steel plate or 304 or 316 stainless steel.
4. Explosion proof mark: ExdeIIBT6/ExdeIICT6
5. Protection level: IP54/IP65
6. Anti corrosion grade: WF1/WF2

Explosion proof self coupling voltage reducing starter 75KW explosion-proof cabinetWorking principle diagram:
1: It plays a role in reducing the starting current of the motor and avoiding the impact on the power supply when the motor starts. However, electromagnetic starters do not have the function of voltage reduction starting. 2: The star delta voltage reducing starter consists of a contactor and a time relay intermediate relay. At startup, connect the star winding, and the voltage of each phase winding is 220; After a delay, connect it into a triangle, and the voltage is 380

Explosion proof self coupling voltage reducing starter 75KW explosion-proof cabinet

1、 Working principle

The core component of the autotransformer starting control cabinet is the autotransformer, which is a special type of transformer that can achieve different voltage outputs according to different tap positions. During the start-up process, the control cabinet will automatically adjust the tap position of the autotransformer according to the preset program, thereby achieving voltage reduction start-up of the motor.

Specifically, when the motor starts, the control cabinet will adjust the tap position of the autotransformer to the same position as the rated voltage of the motor, so that the motor can operate at full voltage. As the motor speed increases, the control cabinet gradually lowers the tap position of the autotransformer, causing the terminal voltage of the motor to gradually decrease, thereby achieving the goal of reducing the starting current. When the motor reaches the rated speed, the control cabinet will adjust the tap position of the autotransformer to the minimum gear, so that the motor can operate at the rated voltage.