On-line remote detection method and device for disk insulator status

Abstract

The invention discloses a method and a device for on-line remote detection of the state of a disc insulator. First, the contamination conductance of the low-potential end insulator of the insulator string at the monitoring point is calculated by calculating; the characteristic value of the contamination of the insulator is obtained after the calculation, which is used to represent the contamination degree of the insulator; The relationship between the insulator voltage at the low potential end of the insulator string and the ratio Kn of the insulator string voltage and the pollution conductance is established in the laboratory, and the number of zero-value insulators in the insulator string is determined; , directly indicating the number of zero-value insulators. When the number of insulators in the string is relatively large, it is usually possible to allow several zero-value insulators to exist at the same time, so that the number of insulators can be clearly indicated, and maintenance can be arranged according to the priority.

Description

technical field [0001] The invention relates to the technical field of remote monitoring, in particular to a remote monitoring device and method for state monitoring of disk insulators of transmission lines. Background technique [0002] The safety of power transmission lines is crucial to national security, national economy and people's lives. With the development of the power grid, in order to maintain the safety of the line, it has gone through the stage of fault inspection, regular inspection and current intelligent detection status inspection. The monitoring content of insulator status includes insulator pollution status monitoring, zero value insulator monitoring, insulator icing monitoring, insulator metal attachment monitoring and so on. At present, the first three have received more attention in online remote monitoring, while the others are still at the level of manual inspection. Existing monitoring devices are basically in independent states. The aspects relev...

AI Technical Summary

Problems solved by technology

The insulator voltage is very high, and it can be measured with a high-voltage voltmeter or a voltage transformer in the substation. Due to the large size and high price of the high-voltage voltage transformer, it is impossible to measure the line voltage of each insulator string outside the substation with a voltage transformer. There is currently no cheap, lightweight and effective method for measuring insulator voltage

[0009] 2) The detection conditions cannot be met at any time

However, the chemical composition and quantity of insulator pollution are uncertain, so the relationship between the measured value and the actual conductance of insulator pollution is lost, thus losing the accuracy of measurement.

[0018] 2) Pollution conductance is also related to gray scale

[0022] 3. Leakage current method

[0026] Because this method needs to know the voltage of the insulator string, and the voltage of each point on the transmission line is not equal to the voltage of the substation, and the voltage of each point is also different, so it is as difficult as the above-mentioned need to measure the voltage

[0027] 2) Requires expensive and huge temperature and humidity laboratory

When the voltage level is relatively high and the number of insulators in the insulator string is relatively large, the degree of influence of the two can be equivalent to the change of the main capacitance current of the low-potential insulator caused by several pieces of zero-value insulators, thus affecting the detection of the method. Sensitivity of zero value insulators

Images