What is a high-voltage switchgear? What is its primary function?
Release time： 2025-02-11
The primary function of a high-voltage switchgear
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Control function
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Opening and closing circuits : Circuit breakers and disconnect switches in high-voltage switchgear control the connection and disconnection of electrical circuits. For instance, in a power plant, circuit breakers can connect or disconnect generators from the power grid, enabling the transmission and distribution of electricity.
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Switching circuit By operating isolating switches and circuit breakers, different parts of the power system can be switched, enabling flexible allocation and dispatching of electricity.
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Protective effect
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Overload protection : When the current in the circuit exceeds the rated value, the circuit breaker automatically trips, cutting off the circuit and protecting equipment and wiring from damage caused by overload.
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Short-circuit protection : When a short circuit occurs, the circuit breaker quickly cuts off the circuit, preventing the short-circuit current from causing severe damage to equipment and wiring.
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Grounding protection When a ground fault occurs in equipment or wiring, the grounding switch will activate, breaking the circuit to prevent the ground fault from posing risks to people and equipment.
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Isolation effect
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Electrical isolation : The isolating switch in a high-voltage switchgear can separate energized parts from de-energized ones, ensuring the safety of maintenance personnel. For instance, during equipment maintenance, the isolating switch allows the device to be safely isolated from live components, enabling work to proceed without risk.
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Mechanical Isolation : The metal enclosure of the high-voltage switchgear prevents personnel from coming into contact with live, high-voltage components, providing mechanical isolation and protection.
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Measurement and Monitoring Functions
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Voltage and Current Measurement High-voltage switchgear is typically equipped with voltage transformers and current transformers, which are used to measure voltage and current in the circuit, providing data support for the operation and monitoring of the power system.
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