Designand Research on Improving Short-Circuit Breaking Capacity of DC MCCB

doi:10.16628/j.cnki.2095-8188.2021.07.008

Abstract

Abstract:

DC moulded case circuit breaker (MCCB) is an important part of low voltage electrical apparatus.The arc extinction is maily completed by the arc extinguishing system in MCCB.DC MCCB can use the method of increasing the number of poles and increasing capacity to improve the short-circuit breaking capacity.The method of increasing the number of poles increases the arc voltage by connecting more poles in series.The method of increasing capacity increases the arc voltage by increasing the arc extinguishing ability of a single arc extinguishing chamber.Inductance also plays a very important role in short circuit breaking.

Key words: DC moulded case circuit breaker (MCCB), arc, arc extinguishing chamber, short-circuit breaking capacity

CLC Number:

TM561

LI Xuelin, JIANG Guping, SHI Xiaorong. Designand Research on Improving Short-Circuit Breaking Capacity of DC MCCB[J]. LOW VOLTAGE APPARATUS, 2021, 0(7): 45-50.

序号	试验方案	电弧电压U_A/V	电源电压U_c/V
序号	试验方案	电弧电压U_A/V	500	800	1 000	1 500
1	普通型1P	约550	通过	不通过	—	—
2	普通型2P	约1 100	—	通过	不通过	—
3	普通型3P	约1 650	—	通过	不通过	—
4	普通型4P	约2 200	—	—	通过	不通过

序号	试验方案	电弧电压 U_A/V	电源电压U_c/V
序号	试验方案	电弧电压 U_A/V	500	800	1 000	1 500
5	增强型2P	约1 750	—	—	通过	不通过
6	增强型3P	约2 600	—	—	—	通过

序号	方案	灭弧室栅片表面积/mm²	灭弧室栅片数量/片	灭弧室数量/个	总表面积/mm²	栅片总数量/片
4	普通型4P	13 470	12	4	53 880	48
5	增强型2P	18 548	22	2	37 096	44

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Designand Research on Improving Short-Circuit Breaking Capacity of DC MCCB

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