PLC-based short-time parallel operation control device for low-voltage double-incoming-bus tie

By integrating synchronous relays and voltage monitors into a PLC-based control system, an intelligent control system is constructed, which solves the problems of low control logic integration and insufficient safety in low-voltage dual-incoming-bus tie systems, and achieves high reliability and flexible power supply management.

CN224637812UActive Publication Date: 2026-08-14SHAOXING CAOEJIANG DAZHA INVESTMENT DEV CO LTD +1
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Patent Information

Application Number
CN202521867153.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-01
Publication Date
2026-08-14
Estimated Expiration
2035-09-01

AI Technical Summary

Technical Problem

The existing low-voltage dual-incoming-bus tie system has low control logic integration and insufficient safety and reliability. In particular, it lacks efficient and reliable means to prevent the simultaneous closing of three circuit breakers, resulting in slow system response, low control accuracy and the risk of equipment damage.

Method used

A PLC-based control system is adopted, integrating synchronous relays, voltage monitoring relays, changeover switches and operation buttons. The PLC controller pre-stores three-in-two electrical interlocking and automatic transfer logic programs to build an intelligent control system, and forms a parallel interlocking channel at the hardware level to ensure the safety and reliability of circuit breaker operation.

Benefits of technology

It achieves highly integrated control logic, simplifies system wiring, improves reliability and maintainability, provides dual safety guarantees, ensures the continuity and flexibility of power supply, and reduces the risk of asynchronous closing.

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Abstract

This utility model discloses a PLC-based low-voltage dual-incoming-line bus tie short-time parallel operation control device, relating to the field of industrial automation control. It includes a first incoming line circuit breaker (1QF), a second incoming line circuit breaker (2QF), and a bus tie circuit breaker (3QF). Synchronous relays are installed in the bus tie cabinet. A PLC controller is also installed in the bus tie cabinet, with its signal input terminal electrically connected to the synchronous relays and voltage monitoring relays installed on the two incoming power supply sides. This PLC-based low-voltage dual-incoming-line bus tie short-time parallel operation control device, through a PLC controller, synchronous relays, voltage monitoring relays, a changeover switch, and operation buttons, connects the signal input terminal of the PLC controller to the synchronous relays and voltage monitoring relays, and connects the control output terminal to the electrical operation circuit of each circuit breaker. Simultaneously, a three-in-one electrical interlocking program and a backup automatic transfer logic program are pre-stored in the PLC controller's memory, constructing a highly integrated and logically rigorous intelligent control system.
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