A perspective of low-voltage circuit breaker interrupting rating

Valentine, Raymond D.

doi:10.1109/28.845071

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…The development of CBs composed of traditional, mechanical contacts is especially difficult due to their relatively complex mechanical structure, and it is hard to expand their performance without significant increases in manufacturing costs [1][2][3]. Nevertheless, enhancement of the efficiency of such devices can be achieved through recognized conventional engineering.…”

Section: Research Topicsmentioning

confidence: 99%

Switching Arc Energy Limitation Approach for LV Circuit Breakers

Smugala

Bonk

2021

Energies

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This paper presents an experimentally verified approach to deriving switching arc energy limitations for low-voltage (LV) circuit breakers (CBs). Air-insulated contactors equipped with additional vacuum-insulated (VI) arcing contacts were tested for AC and DC current interruption efficiency, respectively. In the study, the contact arrangements of reed relay VI contact switches of low current breaking capacity combined with air-insulated contactors were examined. Tests were performed on selected LV CBs inductively loaded for LV power network rated voltages. A comparative analysis of the arc energy resulting from various arc time durations recorded during the switching-off operation was performed. Using a variety of either basic CB air-insulated contact systems or combined contact systems, a practical assessment of the proposed idea for enhancing the arc quenching efficiency was undertaken. As a result of the implementation of the proposed idea, the arc burning duration time was indicated as being hundreds of times shorter. In most cases, a complete arc reduction was achieved. Moreover, the resulting arc energy dissipation during the breaking operation was substantially minimized. Consequently, a significant increase in the total current breaking capacity of the tested CBs was achieved.

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Section: Research Topicsmentioning

confidence: 99%

Switching Arc Energy Limitation Approach for LV Circuit Breakers

Smugala

Bonk

2021

Energies

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“…The circuit breaker is a major component of a protective scheme. The function of a circuit breaker is to provide switching and overcurrent protection functions -the dual functions of disconnect switch and short-circuit protection [1], [2]. They are to protect phase conductors downstream from damage due to current in excess of their ratings [3].…”

Section: Introductionmentioning

confidence: 99%

“…Hence the current flowing when a generator is short-circuited is similar to that flowing when an alternating voltage is suddenly applied to a resistance and an inductance in series [6]. The applied voltage is given as: (1) It is assumed that, the short-circuit occurs at time, 0  t and so  determines the magnitude of the voltage at the occurrence of short-circuit. The waveform of the voltage is as shown in In per phase value, the differential equation relating the supply voltage and short-circuit current is:…”

Section: Introductionmentioning

confidence: 99%

Circuit Breaker Performance Analysis

J¹,

E²

2020

IJISRT

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The problem of circuit breaking becomes complicated when voltages and currents in the range of kilovolt and kiloampere are involved. Circuit breaker (CB) is used in performing switching operations, and is a switch that can open live circuits. Circuit breakers are especially important in protective schemes where they have to interrupt fault currents, and isolate faulty section of the network. When the circuit breaker opens under fault condition many thousands of amperes pass through the contacts and the extinction of the arc and hence effective opening of the contacts of the CB are major engineering problems. When a circuit breaker opens, a high-frequency voltage, superimposed on the normal system voltage appears across the CB contacts. This voltage is known as transient recovery voltage (TRV) or restriking voltage, constituting a switching surge. Restriking delays arc quenching, and so it is detrimental to the circuit breaker as well as the entire system, since fault clearing may be delayed. This paper shows how resistance switching can be used to damp this surge and enable the CB to open before the magnitude of the voltage across the CB contacts reaches peak level, to prevent possible restriking of the arc.

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Advances in Protection and Testing of Power Distribution Systems Within Emerging Markets

Venter

2023

Studies in Systems, Decision and Control

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A perspective of low-voltage circuit breaker interrupting rating

Cited by 8 publications

References 3 publications

Switching Arc Energy Limitation Approach for LV Circuit Breakers

Switching Arc Energy Limitation Approach for LV Circuit Breakers

Circuit Breaker Performance Analysis

Advances in Protection and Testing of Power Distribution Systems Within Emerging Markets

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