High-voltage transformer bushing tap grounding on-line monitoring device

A transformer bushing and monitoring device technology, applied in the field of power transmission and transformation, can solve the problems of inability to realize remote continuous monitoring, achieve reliable operation, reliable and stable working status, and overcome the effects of remote continuous monitoring

Active Publication Date: 2012-07-04
GANSU ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide an online monitoring device for transformer bushing end screen grounding that is reliable in monitoring and eliminates the phenomenon of misjudgment and omission, so as to overcome the defect that the existing device cannot realize remote continuous monitoring

Method used

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  • High-voltage transformer bushing tap grounding on-line monitoring device
  • High-voltage transformer bushing tap grounding on-line monitoring device
  • High-voltage transformer bushing tap grounding on-line monitoring device

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0034] 1. Load 10KV high voltage to the high voltage side of the standard capacitor, check the grounding device of the last screen and the grounding detection circuit part, the sampling transmission device, the solar battery group, and the working conditions of the remote monitoring device, record the current value displayed by the remote monitoring device, and read continuously for 10 Take the average value as the actual measured current.

[0035] 2. Compare the measured current value with the theoretical current value under 10KV high voltage, and calculate the measurement deviation value.

[0036] Experimental example 2, load 110KV high voltage on the high voltage side of the standard capacitor for testing:

experiment example 2

[0037] 1. Load 110KV high voltage to the high voltage side of the standard capacitor, check the grounding device of the end screen and the grounding detection circuit part, the sampling transmission device, the solar battery group, and the working conditions of the remote monitoring device, record the current value displayed by the remote monitoring device, and read continuously for 10 Take the average value as the actual measured current.

[0038] 2. Compare the measured current value with the theoretical current value under 110KV high voltage, and calculate the measurement deviation value.

[0039] Experimental example 3, load 220KV high voltage on the high voltage side of the standard capacitor for testing:

experiment example 3

[0040] 1. Load 220KV high voltage to the high voltage side of the standard capacitor, check the grounding device of the end screen and the grounding detection circuit part, the sampling transmission device, the solar battery group, and the working conditions of the remote monitoring device, record the current value displayed by the remote monitoring device, and read continuously for 10 Take the average value as the actual measured current.

[0041] 2. Compare the measured current value with the theoretical current value under 220KV high voltage, and calculate the measurement deviation value.

[0042] The above experiments prove that: the withstand voltage level of the last screen grounding device 1 meets the insulation requirements under 220KV high voltage; the sampling transmission device 2 works reliably, and the digital-to-analog conversion accuracy meets the requirements of the transformer safety monitoring system; the software function of the remote monitoring device 3 mee...

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Abstract

The invention relates to a high-voltage transformer bushing tap grounding on-line monitoring device, which comprises three tap grounding detection devices, a sampling transmission device, a remote monitoring device and a solar battery pack, wherein the three tap grounding detection devices are connected with the sampling transmission device by cables, the sampling transmission device is in wireless communication connection with the remote monitoring device, and the solar battery pack is connected with the sampling transmission device. Through the tap grounding device, the transformer bushing tap grounding is more reliable; and the transformer bushing tap grounding current is detected through measurement coils arranged in the tap grounding device, the sampling voltage output by the measurement coils is led out through measurement leads and used as an input signal of the sampling transmission device, the sampling transmission device outputs the signal to the remote monitoring device, and the tap grounding current can be continuously monitored through the remote monitoring device. The device realizes real-time remote continuous monitoring of the transformer bushing tap grounding current state, and is reliable and stable in working state.

Description

technical field [0001] The invention belongs to a facility for detecting the grounding state of the end screen of a high-voltage transformer bushing in the field of power transmission and transformation, in particular to an on-line monitoring device for the grounding of the end screen of a high-voltage transformer bushing. Background technique [0002] In order to make the radial and axial field strength of the transformer bushing of 110kV and above uniform, the insulation structure generally adopts a capacitive type, that is, many insulating layers are wrapped on the conductive rod, and many aluminum foils are sandwiched according to the characteristics of the field strength distribution. A string of concentric cylindrical capacitors. The outermost aluminum foil, that is, the last screen, is led out through a small bushing to measure the dielectric loss and capacitance of the bushing. The last screen should be grounded during operation. If the end screen is poorly grounded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 张世才马呈霞秦睿吴金辉葛智平郭涛张顺李强马林东
Owner GANSU ELECTRIC POWER RES INST
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