On-line ultrahigh-voltage line power transformer test method

Abstract

An on-line ultrahigh-voltage line power transformer test method includes the following specific steps: measuring off-line 'raw data' and on-line 'basic data'; measuring the insulation resistance R of windings; analyzing the insulation resistance R of the windings; measuring the active current I Rho, reactive current I Kappa and dielectric dissipation factor tan Delta of each winding; analyzing the dielectric dissipation factor tan Delta; measuring the capacitance C of capacitance type bushings; analyzing the capacitance C of the capacitance type bushings; measuring the leakage current I of the windings; and analyzing the leakage current I of the windings. The on-line ultrahigh-voltage line power transformer test method has the advantages that the measurement result is accurate, the safety of operators can be guaranteed, equipment injuries can be prevented, and safety is good.

Description

technical field [0001] The invention relates to a method for conducting preventive tests on power transformers, in particular to a test method for power transformers with ultra-high voltage lines without disconnecting the wires. Background technique [0002] In order to discover the hidden dangers of power transmission and transformation equipment in operation and prevent accidents or equipment damage, it is necessary to conduct preventive tests on power transmission and transformation equipment. At present, the commonly used preventive test method for transformers is to remove the connections on each side of the transformer, and then perform routine measurements on various data of the transformer. The process of disassembling and assembling the leads is dangerous, labor-intensive and time-consuming, and the equipment is easily damaged. In order to avoid the occurrence of the above phenomenon, CN101354418 B discloses a test method for a power transformer without disconnecti...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1. Due to the dense power facilities around the power transformer of 500kV and above lines, and the high voltage of the alternating current passing through the surrounding power facilities, it is easy to generate AC interference current to interfere with the instrument, the instrument display is unstable, and the measurement result is inaccurate , or even unable to read; 2. The current passing through the power facility is large, which will generate static electricity to damage the operator or experimental equipment, and the safety is poor

3. In the conventional method, the dielectric loss measurement adopts the reverse connection method. The data measured by this method include the dielectric loss of the CTV of the transformer and the lead-out line of the bushing, and the dielectric loss of the CTV and the lead-out line of the 500kV transformer is relatively large. It cannot be ignored, resulting in a large error in the measurement results; 4. When measuring the capacitance of the primary side and secondary side of the winding, the inductance and no-load loss of the winding will affect the measurement results

According to the conventional non-disconnection test method disclosed in CN101354418 B, it is difficult to carry out the non-disconnection test of 500kV and above ultra-high voltage line power transformers

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