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The Connection Method Of Current Transformer Is Not Complicated, Only Four Kinds Of Connection Form.
Jul 25, 2017

The connection method of current transformer is not complicated, only four kinds of connection form.

1 、 the connection form of the single current transformer.

Can only reflect the situation of single-phase current, suitable for measuring the phase current or three-phase load balance, measuring the phase to know the situation of three-phase, most of the current meter.

2 、 three phase full star connection and triangle connection form.

Three phase current transformer can timely and accurately understand the change of three-phase load, and is used in the transformer differential protection wiring. Only three phase full star connection can be used in the neutral point direct grounding system for power meter current collection. The three-phase three relay wiring can not only short reaction of various types, but also reflect the single-phase short circuit, so the wiring used in neutral directly grounding protection as phase short-circuit protection and single-phase grounding short circuit system.

3 、 the form of two phase incomplete star connection.

Used most often in real work. It saves a current transformer, using A, C phase synthesis current to form the inverting B phase current. Two phase double relay connection mode can react with phase to line short circuit, but it can not respond to single phase grounding short circuit, so it can not be protected by single phase grounding. This connection mode is used for neutral point ungrounded system or through arc suppression coil grounding system for interphase short circuit protection.

4, two phase difference current connection form.

Only for three-phase three wire circuit, neutral, or neutral, advantages of this wiring is not only save a current transformer, but also can use a relay to reflect the interphase short circuit fault in three-phase circuit, i.e. with the least relay three-phase current protection, save investment. But the sensitivity is different when the fault form is different. This connection mode is often used in the distribution network of 10kV and below for interphase short circuit protection. Because of its low sensitivity, it has rarely been used in modern times.


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