Current transformer secondary side circuit and disconnection detection method thereof

A current transformer, disconnection detection technology, applied in emergency protection circuit devices, electrical components, continuity testing and other directions, can solve problems such as fault expansion, malfunction, threat to equipment and personal safety, etc., to achieve the effect of safe and stable operation

Pending Publication Date: 2021-02-19
XUJI GRP +2
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Problems solved by technology

The alternating magnetic flux induces a suspended high voltage on the secondary side coil of the current transformer, and its peak value can sometimes reach tens of thousands of volts. Such a high voltage acts on the secondary circuit of the current transformer and the secondary side coil , will seriously threaten the safety of equipment and personal safety, and may even cause the insulation of the current transf

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  • Current transformer secondary side circuit and disconnection detection method thereof
  • Current transformer secondary side circuit and disconnection detection method thereof

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[0027] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.

[0028] Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and features in the embodiments may be combined with each other without conflict.

[0029] Please refer to figure 1 , the first embodiment of the present invention provides a current transformer second...

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Abstract

The invention discloses a current transformer secondary side circuit and a disconnection detection method thereof. The circuit comprises a current transformer, a secondary side parallel resistor of the current transformer, an adjustable current source and an ADC chip. The detection method comprises the following steps of sampling the ADC chip to obtain an ADC sampling value, judging whether the sampling value of the ADC is greater than the secondary side parallel resistor resistance value Rs * the initial value I0 of the primary side current, if the ADC sampling value is greater than Rs * I0,judging the transformer is not disconnected, if the ADC sampling value is equal to 0, judging the transformer is not disconnected, and if the ADC sampling value is equal to Rs * I0,continuously adjusting the current of the Is linearly N times, judging the change condition of the ADC sampling value, wherein the Is is the current value of the adjustable current source. Whether the secondary side ofthe current transformer is disconnected or not can be quickly and accurately judged in real time, the influence of current transformer disconnection on a power system is reduced to the minimum, harm caused by current transformer secondary side disconnection is avoided, and reliable, safe and stable operation of a power grid is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power system safety detection, in particular to a secondary side circuit of a current transformer and a disconnection detection method thereof. Background technique [0002] In order to ensure the safe and economical operation of the power system, it is necessary to monitor and measure the operation of the power equipment. The primary winding of the current transformer is connected in series with the high-voltage transmission circuit, and the secondary winding is connected with secondary equipment such as measuring instruments and protection devices, which is related to the accuracy of measurement and measurement, the reliability of the relay protection device and the safety of the high-voltage transmission circuit. . There are different degrees of vibration during the transportation and operation of the current transformer, and the quality of the current transformer itself is relatively heavy, and the c...

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Application Information

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IPC IPC(8): G01R31/54H02H7/04
CPCG01R31/54H02H7/042
Inventor 王志鹏王振华侯涛邢珊珊胡凯利宋海飞李莎莎赵群辉姚艳艳朱晓军
Owner XUJI GRP
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