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Installation Method Of Three-phase Integral Zero Sequence Current Transformer
Sep 08, 2017

Installation method of three-phase integral zero sequence current transformer

Three phase integrated zero sequence current transformer should be installed on the bottom of switch cabinet or should be supported by reliable support. But some manufacturers or construction units will support one three-phase zero sequence current transformer installed in the switch cabinet on the floor below, even the development of three-phase zero sequence current transformer bundled on the cable, which is contrary to the principle of fully enclosed switchgear, neither safe nor dust, but not prevent the small animal, leave a lot of risks.

When the cable terminal head passes through an outer three phase integral zero sequence current transformer, the relative position between the cable metal shielding earth wire and the outer three-phase three-phase zero current transformer is not correct. According to "electrical engineering in Beijing installation procedures" provisions: three core power cable terminal metal shield must be well grounded in each phase; plastic cable and copper shielding steel cayin tin welding wire (oil paper insulated cable lead packages and welding wire, cable should be shielded by a body) three-phase zero sequence current transformer. Cable metal sheath and ground to ground insulation, grounding cable (cable shielding wire and solder metal cable) in the transformer when the grounding wire should be directly connected to the ground; grounding in transformer when the grounding wire should be through transformer grounding, grounding wire must be connected to the switch cabinet special grounded on the bar, the grounding wire should be used in copper wire or tinned copper braided wire, grounding wire section must meet the requirements in the specification. In the inspection found that some grounded cable should wear one three-phase zero sequence current transformer does not wear, some should not wear one three-phase zero sequence current transformer actually wear, accident ground zero sequence protection can not function properly.


Add: No.38 South Taoyuan Road, Yaozhuang Town,Jiashan County, Jiaxing City, Zhejiang Province, China
Contact person: Elva Zhuang&Sunny Ni
Tel:+86-573-84775555
Fax:+86-573-84776699
Phone:+86-13732570078
E-mail:sales9@great-relay.com
sunny.ni@great-relay.com