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Implementing Diode-Free MOV-RCV Snubber Based DC Solid-State Circuit Breakers
Journal article   Peer reviewed

Implementing Diode-Free MOV-RCV Snubber Based DC Solid-State Circuit Breakers

Shuyan Zhao, Reza Kheirollahi, Yao Wang, Hua Zhang and Fei Lu
IEEE journal of emerging and selected topics in industrial electronics (Print), pp 1-8
21 Sep 2023
DOI: https://doi.org/10.1109/JESTIE.2023.3317790

Abstract

Circuit faults Clamps Costs High-voltage techniques Impedance MOV-RCV snubber Snubbers Solid-state circuit breaker Voltage
This paper presents a diode-free metal oxide varistor (MOV) resistor-capacitor-varistor (RCV) snubber based solid-state circuit breaker (SSCB). It prevents voltage overshoot and ensures a smooth turn-off voltage slew rate. Compared to a conventional MOV resistor-capacitor-diode (MOV-RCD) circuit, the MOV-RCV snubber adopts a low-voltage MOV (LMOV) to replace a high-power diode to reduce cost, and there is no continuous voltage stress across the LMOV. The working principle and design method in the MOV-RCV circuit are presented through LTspice simulation. Its effectiveness is further validated by 400 V/ 140 A interruption experiments with different LMOVs. The experimental results illustrate a successful interruption process, and the maximum turn-off d v /d t is limited at 7.9 V/ns. In addition, the proposed MOV-RCV snubber achieves 31% cost saving compared to a MOV-RCD based counterpart.

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