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Problems To Be Paid Attention To In Selecting Low Voltage Current Transformer
Mar 09, 2018

Problems to be paid attention to in selecting low voltage current transformer

In the electrical design of civil engineering, there are many improper selection of low voltage current transformer. The current meter in distribution cabinet is too small, which is not conducive to the operation of the monitoring loop. There are many reasons for the existence of this phenomenon. For example, the use of civil electrical equipment is complex, and it is not stable. When designing, the load calculation coefficient is too large, and the ratio of current transformer is not properly selected. Although some factors are unavoidable, if we choose the current transformer rationally, we will make it closer to reality. In the process of the design of the distribution system, the problem of choosing the current transformer often appears to talk about its own idea.

Design specification for the selection of current transformer

In the code for electrical design of civil buildings, the measurement range of instrument and the ratio of current transformer are easy to be satisfied. When the power equipment loop is running at rated value, the indication of instrument is 70% of the scale. The current transformer selected in accordance with this regulation is reasonable

In this way, when the equipment runs normally, the instrument is directed at about 70% of the range (scale), which is easy to observe and work in high precision. However, due to the fact that the composition and usage of the distribution system of civil buildings is rather complex, the rated running current of distribution loop is not easy to be accurately and accurately. Therefore, when designing the project, it is often used to calculate the current as the rated operation current to select the current transformer. The current side current of the current transformer will be greater than that of the circuit breaker's overload protection setting when the residual current transformer is selected, and the circuit of the terminal of the redistribution system. At this point, whether the current transformer is not damaged by the protection of the circuit breaker, this is the analysis of the use of current transformer and the capacity of the load.


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