The electrical interlocking function of the withdrawable switch cabinet is crucial to ensure the safe operation of the equipment and the personal safety of the operators. There are mainly the following ways to implement it:
1. Mechanical interlocking
The interlocking function is realized through mechanical structure. For example, in the drawer unit of the switch cabinet, a mechanical lock is set. When a drawer is in the working position, other drawers cannot be drawn out to prevent multiple circuits from being connected or disconnected at the same time due to misoperation. At the same time, the mechanical interlocking can also be linked with the switch of the cabinet door. When the cabinet door is opened, the power supply is automatically cut off to prevent people from being electrically shocked.
2. Electrical interlocking
1. Interlocking is realized by auxiliary contacts. Auxiliary contacts are set on the circuit breakers, contactors and other electrical components of the switch cabinet. By connecting these contacts to the control circuit, interlocking between different devices is realized. For example, when a circuit breaker is in the closed state, its auxiliary contacts disconnect the closing circuit of another related circuit breaker to prevent the two circuit breakers from being closed at the same time and causing a short circuit fault.
2. Interlocking is realized by using a programmable logic controller (PLC). By programming the PLC, complex interlocking logic can be implemented. For example, the actions of various devices in the switch cabinet can be automatically controlled according to the system's operating status and operation sequence to ensure the correctness and safety of the operation. The PLC can also communicate with the host computer to achieve remote monitoring and operation, and improve the intelligence level of the system.
3. Electromagnetic interlocking
The interlocking function is realized by electromagnetic principle. For example, an electromagnetic lock is set in the switch cabinet. When specific electrical conditions are met, the electromagnetic lock is unlocked to allow corresponding operations; when the conditions are not met, the electromagnetic lock is locked to prevent misoperation. Electromagnetic interlocking can respond quickly to electrical signals and has high reliability and flexibility.
In short, the electrical interlocking function of the Withdrawable Switch Cabinet is realized by mechanical, electrical and electromagnetic methods. These interlocking measures cooperate with each other to ensure the safe operation of the switch cabinet and prevent electrical accidents caused by misoperation. In practical applications, it is necessary to select the appropriate interlocking method according to specific needs and system requirements, and operate and maintain in strict accordance with the operating procedures to give full play to the role of the electrical interlocking function.
