Medium-voltage switchgear system having single phase breaker control

The switchgear system addresses access and maintenance challenges through magnetic actuators, drive mechanisms, and ventilation improvements, ensuring stable operation and safety during short circuits and improving ventilation and heat management.

CA3205352CActive Publication Date: 2026-09-22JST POWER EQUIPMENT INC
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Patent Information

Application Number
CA3205352
Authority / Receiving Office
CA · CA
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-02-25
Filing Date
2021-04-26
Publication Date
2026-09-22
Estimated Expiration
2041-04-26

AI Technical Summary

Technical Problem

Existing metal-clad or metal-enclosed medium voltage switchgear systems face challenges in accessing transformers and fuses for maintenance, stability during short circuit events, shutter design failures, ventilation issues, and high electrostatic field stresses in contact arms, which can lead to inefficiencies and potential damage.

Method used

The system incorporates a switchgear frame with magnetic actuators and a controller circuit to manage single-phase overcurrent or faults, a drive mechanism for stable circuit breaker movement, and a ventilation duct for convective cooling, along with improved contact arm configurations to enhance safety and efficiency.

Benefits of technology

The solution provides stable operation during short circuit events, facilitates safe maintenance access, and improves ventilation and heat management, enhancing the overall performance and safety of the switchgear system.

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Abstract

A medium-voltage switchgear system and a method for operating the medium-voltage switchgear system, the medium-voltage switchgear system includes a three-phase circuit breaker having first, second and third single-phase vacuum interrupters connected between respective first, second and third single-phase inputs and first, second and third single-phase outputs. Magnetic actuators are connected to first, second and third single-phase vacuum interrupters, which are configured to receive an interrupt signal and in response, actuate the respective vacuum interrupter connected thereto into an open circuit condition. A controller circuit is connected to each of the first, second and third magnetic actuators and generates an interrupt signal in response to a detected single-phase overcurrent or fault on a single-phase circuit and interrupt that single-phase circuit on which the single-phase overcurrent or fault occurred and maintain power on the remaining two single-phase circuits over which a single-phase overcurrent or fault was not detected.
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