Insulated on-line monitoring system checker of high-voltage electric equipment

Abstract

The invention relates to a device for correcting the on-line monitoring system of high voltage electric device insulation. The device comprises a power circuit, a standard loss circuit and a zinc oxide lightning arrester circuit; wherein the standard loss circuit includes three parallel connected standard capacities, 18 resistors and three switches.

Description

technical field [0001] The invention relates to a verification device of an on-line insulation monitoring system for high-voltage electrical equipment. Background technique [0002] In the power system, there are a large number of generators, transformers, high-voltage switches, voltage transformers, current transformers, high-voltage bushings, coupling capacitors, insulators and other power equipment. The quality of their insulation status directly affects the safe operation of the power grid. Once the insulation of these electrical equipment is damaged, causing equipment accidents, in addition to causing direct economic losses, it will also cause large-scale power outages and huge indirect losses. In order to monitor the insulation status of electrical equipment and ensure the safety of electrical equipment, the power department has formulated a series of test procedures, such as electrical equipment handover and preventive test procedures, through regular preventive test...

AI Technical Summary

Problems solved by technology

[0004] 1. When conducting preventive tests, the electrical equipment under test needs to be powered off, which will definitely affect the power supply to users;

[0005] 2. During the preventive test, the state of the equipment under test does not match the state in operation (the test voltage of the preventive test of electrical equipment of 110kV level and above is low, such as the dielectric loss test voltage is 10kV, which cannot represent the actual operating conditions ;

[0006] 3. Because the preventive test period is long, the preventive test period for regular power outages is 1 to 3 years, and the equipment in operation often breaks down during the test interval;

[0007] 4. Excessive power outages on electrical equipment, because even if the equipment is in good condition, it still needs to be tested and repaired according to a fixed cycle, resulting in waste and even possible damage to the equipment

[0013] Due to the lack of necessary technical testing and verification methods for insulation online monitoring systems at home and abroad, all insulation online monitoring systems have not undergone formal factory inspections and on-site handover tests, and it is impossible to check the performance and test results of insulation online monitoring systems during operation. The accuracy and sensitivity are regularly checked, and the accuracy and validity of the data monitored by the insulation on-line monitoring system cannot be scientifically identified.

Therefore, the insulation on-line monitoring cannot replace the regular power outage preventive test for the time being.

The data detected by some insulation on-line monitoring systems are false, thus withdrawing from operation, resulting in great waste

Therefore, the change of insulation on-line monitoring data cannot be used as a basis for judging the insulation status of high-voltage equipment in operation for the time being.

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