Complete HV on-off cabinet

Complete high-voltage switchgear is a core component of power transmission and distribution systems, fulfilling crucial functions such as power distribution, circuit protection, and power dispatching. It is widely used in power plants, substations, industrial and mining enterprises, and large commercial facilities, ensuring the safe, stable, and efficient operation of power systems. Jiangsu Haijian Co., Ltd. is a professional manufacturer and supplier of complete high-voltage switchgear. We offer specialized equipment for cement production, industrial solid waste incineration, and mining and metallurgical applications.

High-voltage switchgear plays multiple roles in power systems, primarily including:
Power distribution and control: It distributes high-voltage power to various power circuits, enabling flexible power system operation. Components such as circuit breakers and disconnectors control the connection and disconnection of circuits, ensuring a stable power supply.
Circuit protection: When an overload, short circuit, or ground fault occurs in the power system, the high-voltage switchgear quickly interrupts the fault current, preventing equipment damage and grid collapse. Equipped with relay protection devices, it ensures a rapid response to faults and improves power supply reliability. Isolation and Maintenance: During equipment maintenance or troubleshooting, high-voltage switchgear provides a clear disconnect point to ensure operator safety.

The core functions of high-voltage switchgear are accomplished by the collaborative work of several key components. Their operating principles are as follows:
1. Main Circuit Structure
The main circuit of a high-voltage switchgear typically includes:
Circuit Breaker (CB): Responsible for normal circuit interruption and fault protection, using vacuum, SF6, or air insulation technology.
Disconnector (DS): Used to isolate the power supply during maintenance and ensure operational safety.
Current Transformer (CT) and Potential Transformer (PT): Used for measurement and protection, converting high voltage and high current into monitorable signals.
Busbar System: Connects the various circuits to facilitate power transmission.
2. Operating Mechanism
Manual Operation: Suitable for small switchgear, with mechanical handles controlling the circuit breaker and disconnector.
Electric Operation: Driven by a motor, it enables remote control and is suitable for highly automated systems.
Spring Energy Storage: Ensures rapid opening and closing of the circuit breaker, improving operational reliability. 3. Protection and Control
Relay protection devices: Monitor current, voltage, and other parameters, triggering circuit breakers to trip in the event of a fault.
Intelligent monitoring system (optional): Enables remote monitoring, fault diagnosis, and automatic control through a PLC or microcomputer-based protection device.