Electrical components and equipment

Electrical components and equipment The company's main products: high and low voltage circuit breakers, power distribution equipment, voltage regulators, UPS power supplies, surge protectors

PV Wind Power Special
23/07/2022

PV Wind Power Special

Schneider ABB, Professional
28/06/2022

Schneider ABB, Professional

Low voltage distribution
27/06/2022

Low voltage distribution

配电工程
23/05/2022

配电工程

NS-EZD-MT-MVS
06/05/2022

NS-EZD-MT-MVS

PT-SPD
27/04/2022

PT-SPD

Contribute to Myanmar's electric power industry
18/08/2020

Contribute to Myanmar's electric power industry

Tang city of Xiangyang
12/07/2020

Tang city of Xiangyang

25/05/2020

为什么要用四极开关?什么情况下不需要四极开关?
(1) 必须选用四极开关:
Q 为维修安全起见:TT接地系统中，即使用户侧做了总等电位联结，但因为此时的总等电位联结不包括中性线，线路故
5.
6.
障(譬如:某相线接地)在电源侧接地极上产生的电位会传导至用户侧，从而导致在使用三极开关时电气维修的电击事
故。此时，需用四极开关将中性线和相线全部隔离;
Q 为防杂散电流及正常使用RCD功能:中性线有并联通路的情况下，为防杂散电流及使双电源转换开关上的RCD能正常工
作，也必须采用四极开关;
Q 当IT系统引出中性线时，为维修安全起见:IT系统一般不引出中性线，原本不存在采用四极开关的问题。如果引出中性
线，当发生一相接地故障时，中性线对地电压将为相电压220v，电击危险甚大，需为电气维修安全安装四极开关。
(2) 不需要四极开关的情况:
Q TN-C-S和TN-S系统内不需为电气维修而装设四极开关;
Q 附设于建筑物内或单独设置的多变压器或单变压器变电所内，如果做有等电位联结，则不论TN-C-S、TN-S、TT系统均不
需为电气维修而装设四极开关。

Professional production!
22/04/2020

Professional production!

Address

Shenzhen
518000

Telephone

+8675525835421

Website

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