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Device for online monitoring and overcurrent limiting power transformer iron core grounding current

A technology for iron core grounding current and power transformers, applied in the field of transformers, can solve the problems of untimely fault processing, single function, inconvenient fault analysis, etc., and achieve the effect of ensuring safe operation

Inactive Publication Date: 2007-09-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

This method can only monitor the grounding current and give an alarm when the current exceeds the standard. The processing after the current exceeds the standard is still done manually and cannot be carried out automatically. It is not convenient for post-event fault analysis, and the function is relatively single

Method used

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  • Device for online monitoring and overcurrent limiting power transformer iron core grounding current
  • Device for online monitoring and overcurrent limiting power transformer iron core grounding current
  • Device for online monitoring and overcurrent limiting power transformer iron core grounding current

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Embodiment Construction

[0022] When the transformer core is in operation, the electric field and magnetic field of the coil work together to make the various parts of the core (including clamps, etc.) have different potentials. If the core is not reliably grounded, intermittent discharge may occur due to different potentials. Damage its insulation, so the transformer core must be reliably grounded at one point; but on the other hand, if the transformer core is grounded at multiple points, a closed loop will be formed between every two grounding points, and the magnetic flux of the hinge will be in the loop. The circulating current induced in the center will cause local overheating of the iron core, and in severe cases, it will cause local burning. This is the multi-point grounding fault of the transformer iron core. When the iron core is only grounded at one point, the effective value of the current flowing through the transformer iron core is only tens of milliamperes, which is not harmful to the iro...

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Abstract

The present invention pertaining to the field of the transformer field provides a device for monitoring the ground current of an electric power transformer iron chip for solving the problem of monitoring the ground current of the iron chip. The device in the present invention consists of a current transformator, a signal processing circuit, DSP, a current-limiting resistance network and the control circuit thereof. Said current-limiting resistance network includes a group of resistances and four relays. The first resistance, the second resistance and the third resistance are connected to the fouth resistance and the normally closed contacts of the first relay to form a parallel circuit after being connected to the normally closed contacts of the control relay in series and are connected to the transformer iron chip ground loop in series. The windings of the four relays are connected to the output end of the control circuit and the input end of the control circuit is connected to the data output end of DSP. In the present invention, the ground current of an electric power transformer iron chip can not only be monitored in real time, but also be limited in a defined range automatically, thus, the safe running of the electric power transformer can be ensured.

Description

technical field [0001] The invention relates to a device capable of real-time monitoring of the grounding current of the iron core of a power transformer and automatically limiting it within a specified range, belonging to the technical field of transformers. Background technique [0002] The power transformer is one of the important electrical equipment in the power system, and its operation status is directly related to the safety and stability of the power system operation. The statistical analysis of transformer accidents shows that iron core accidents account for a relatively high proportion of the total transformer accidents, and most of the iron core faults are caused by multi-point grounding of the iron core. When the iron core is multi-point grounded, There will be quite a large current flowing through the iron core, which will cause local overheating of the iron core, and in severe cases will cause local burning, so it is necessary to monitor the current in the tra...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R31/02
Inventor 律方成王胜辉张正平刘云鹏刘孝义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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