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Conductive system of vacuum circuit breakers

2023-10-17

The conductive system of a vacuum circuit breaker (VCB) refers to the arrangement of conductive components that carry and interrupt the electrical current. The conductive system plays a crucial role in ensuring reliable current flow and effective interruption. Here are the key components of the conductive system in a vacuum circuit breaker:

1. Fixed Contact: The fixed contact is a stationary component that remains in a fixed position within the vacuum interrupter. It is typically made of high-conductivity materials, such as copper or copper alloy. The fixed contact is designed to provide a stable connection and conduct the electrical current during normal operation.

2. Movable Contact: The movable contact is a component that can be moved to create or break the electrical circuit. It is typically connected to the operating mechanism of the circuit breaker, allowing it to be opened or closed as needed. Similar to the fixed contact, the movable contact is made of high-conductivity materials to ensure efficient current flow.

3. Current Carrying Conductors: The current carrying conductors are the metallic paths that connect the fixed and movable contacts. These conductors, often in the form of copper or copper alloy strips or rods, carry the electrical current during the closed position of the circuit breaker. They should have low resistance and high conductivity to minimize power losses and ensure efficient current transfer.

4. Contact Pressure Springs: Contact pressure springs are used to ensure proper contact between the fixed and movable contacts. These springs exert a sufficient force to maintain a tight and reliable connection, reducing contact resistance and preventing arcing.

5. Terminal Connectors: Terminal connectors are used to provide electrical connections between the vacuum circuit breaker and external circuits or devices. They allow for the proper transmission of current into and out of the VCB.

The conductive system of a vacuum circuit breaker is designed to ensure low contact resistance, minimal power loss, and efficient current flow. The materials used for the contacts and current carrying conductors are carefully selected to provide high conductivity and withstand the electrical and thermal stresses during operation. The design of the conductive system also considers factors such as contact pressure, arc erosion, and temperature rise to ensure reliable performance and longevity of the VCB.

It's important to note that the specific design and configuration of the conductive system can vary between different manufacturers and models of vacuum circuit breakers. Therefore, it is recommended to refer to the product specifications and manufacturer's documentation for detailed information on the conductive system of a specific VCB.

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