English
The high-voltage outlet cabinet is an important equipment used to distribute and control electric energy in the power system, and is usually installed in substations, distribution rooms and other places. It is mainly used to distribute high-voltage electrical energy from the bus to various electrical equipment or sub-distribution systems. The following is a detailed description of the high-voltage outlet cabinet:
1. Structure and composition
The high-voltage outlet cabinet is usually composed of the following main parts:
Cabinet body: metal armor structure, with high mechanical strength and protection level. The cabinet is usually divided into multiple compartments, such as circuit breaker room, bus room, cable room, relay room, etc., and each compartment is isolated by metal partitions to ensure safety.
Circuit breaker: Vacuum circuit breaker or SF6 circuit breaker is usually adopted, which has high breaking capacity and long life. Circuit breakers are used to turn circuits on and off, protecting circuits and equipment from short circuits and overloads.
Bus system: used to connect the power transmission between the cabinets, usually using copper or aluminum bars.
Cable room: used to connect incoming and outgoing cables, usually equipped with cable heads, grounding switches, etc.
Relay room: install protection relays, measuring instruments, control elements, etc., which are used to monitor and control the operating status of the switch cabinet.
Operating mechanism: includes manual and electric operating mechanism, which is used to control the opening and closing operation of the circuit breaker.
2. Key features:
High safety: The high-voltage outlet cabinet adopts a metal armored structure, and the compartments are completely isolated from each other to prevent the spread of faults. The cabinet is also equipped with a pressure relief device to ensure that pressure can be safely relieved in the event of an internal failure.
Easy to operate: The circuit breaker is installed on the mid-mounted hand car, which can be easily pulled out and pushed in, which is convenient for maintenance and overhaul. The design of the operating mechanism is reasonable, the operating force is small, and the reliability is high.
High protection level: The protection level of the cabinet usually reaches IP4X, which can effectively prevent the entry of dust and foreign objects.
Modular design: The high-voltage outlet cabinet adopts a modular design, which is easy to expand and combine, and can meet the needs of different users.
Intelligent: Modern high-voltage outlet cabinets are usually equipped with intelligent monitoring systems, which can monitor the operating status of the switch cabinet in real time and provide remote control and fault diagnosis functions.
3. Technical parameters
Rated voltage: 3.6kV, 7.2kV, 12kV, 24kV, etc
Rated current: 630A, 1250A, 1600A, 2000A, 2500A, 3150A, etc
Rated short-circuit breaking current: 20kA, 25kA, 31.5kA, 40kA, etc
Rated short-time withstand current: 20kA, 25kA, 31.5kA, 40kA, etc
Rated peak withstand current: 50kA, 63kA, 80kA, 100kA, etc
Degree of protection: IP4X (enclosure), IP2X (internal compartment)
4. Fields of application
Power plant: used for generator export, plant power system, etc.
Substation: used for power distribution system, transformer protection, etc.
Industrial and mining enterprises: used for high-voltage motor control, power distribution system, etc.
Urban power grid: used for distribution substation, ring network power supply, etc.
5. Maintenance and upkeep
Regular inspection: Regularly check the mechanical parts, electrical connections, insulation status, etc. of the switchgear to ensure its normal operation.
Cleaning and maintenance: Keep the inside of the cabinet clean to prevent the accumulation of dust and foreign matter.
Operation training: professional training is provided to operators to ensure that they are familiar with the operating procedures and safety precautions of the switchgear.
6. Safety precautions
Pre-operation inspection: Before operating the switch cabinet, it is necessary to check the status of the circuit breaker, the position of the grounding switch, etc., to ensure the safety of operation.
Prevent misoperation: Operate in strict accordance with the operating procedures to prevent accidents caused by misoperation.
Troubleshooting: In the event of a failure, the power supply should be cut off immediately and repaired by professionals.
7. Typical configuration
Inlet cabinet: used to receive electrical energy from the upper power supply, usually equipped with current transformer, voltage transformer, protection relay, etc.
Outlet cabinet: used to distribute electric energy to the subordinate distribution system or electrical equipment, usually equipped with circuit breakers, current transformers, protective relays, etc.
Bus unit: It is used to connect two sections of bus bars to realize the segmented operation and parallel operation of the bus.
PT cabinet: used to install voltage transformers, provide voltage signals for measurement and protection.
With its high reliability, safety and flexibility, high-voltage outlet cabinets have been widely used in power systems. With the continuous progress of technology, high-voltage outlet cabinets are also developing in the direction of intelligence and digitalization, providing users with more efficient and convenient power solutions.
High - voltage outlet cabinet
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