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Prevention Measures Of Current Transformer Explosion
May 28, 2018

The measures to prevent the current transformer exploding are similar to the voltage transformers in the aspects of product selection, inspection, seal transformation and oil injection. The following are only introduced to the preventive measures applicable to the current transformer.

(1) check whether the lead connector in the primary terminal of the transformer is in good contact.

The joint part of the first terminal lead of the current transformer should be in good contact and the contact area should be kept enough to prevent the current transformer from overheating fault. The L2 terminal and the expander cover should pay attention to the equal potential connection to prevent the potential suspension. In addition, anti rotation measures should be taken for the two times wire drawing crucible, so as to prevent external operation from breaking the internal leads.

(two) the reasons for the abnormal test value

When the TG value of dielectric loss factor measured before and during operation is abnormal, it is necessary to analyze the obvious change of TG delta with temperature or the rise of test voltage from 10kV to Um/ root 3, and when TG delta increment exceeds man 0.3%, it should be out of operation. When the results of chromatographic analysis are abnormal, we should follow the comprehensive analysis and investigate the growth trend. If the data increase rapidly, we should pay attention to it. The accident was destroyed in the bud.

(three) the normal input of the insured bus differential protection

In order to avoid the extent of the accident when the bottom of the capacitance core of the current transformer is broken down, it should be noted that the first terminal L1, the installation direction of the L2 and the polarity connection mode of the two winding should be correct, so as to ensure the normal operation of the bus differential protection.

(four) checking short-circuit current

According to the development of the power grid, pay attention to checking the short-circuit current at the location of the current transformer, and arrange the replacement in time when the value of the dynamic and thermal stable current of the transformer nameplate is exceeded.

(five) on-line monitoring and infrared temperature measurement for the product plate

At present, the main online monitoring items of current transformer are: measuring the capacitance of the main insulation and dielectric loss factor TG [delta], measuring the insulation resistance of the end screen and the dielectric loss factor TG Delta. Test experience shows that it is effective for detecting insulation defects. Some units have been carried out for infrared temperature measurement. The existing test results show that it is effective for detecting the internal joint loosening of current transformers.

But it still needs to accumulate experience.


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