On-line ultrahigh-voltage line power transformer test method

A technology of power transformers and test methods, which is applied in the direction of measuring electrical variables, instruments, and measuring electricity, can solve problems such as unstable instrument indications, large errors in measurement results, and unreadable readings, so as to achieve true and credible diagnostic results and reduce Measuring errors and preventing static electricity from beating people

Inactive Publication Date: 2012-10-17
MAINTENANCE BRANCH STATE GRID LIAONING ELECTRIC POWER +1
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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 d...

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  • On-line ultrahigh-voltage line power transformer test method
  • On-line ultrahigh-voltage line power transformer test method

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Embodiment Construction

[0035] As shown in the figure, the specific steps of the ultra-high voltage line power transformer test method without disconnection are as follows:

[0036] The specific steps of the ultra-high voltage line power transformer test method without disconnection are as follows:

[0037] 1) Measure the insulation resistance between the transformer core 3, clamps, each winding and the bushing, as well as the leakage current, dielectric loss factor and capacitance value of the bushing and each winding before the transformer is put into operation, and use it as the "original Data", after connecting the side wires of the transformer, measure the above data again as the "basic data".

[0038] 2) Measure the insulation resistance R of the winding: ground the G terminal of the megohmmeter 4, connect the L terminal of the megohmmeter 4 with the winding to be tested, the iron core 3 and the clamp of the transformer respectively, and connect the L terminal with the transformer to be tested ...

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/06
Inventor 范乃心吴建军张宏志杨树权陈壮王飞杨雪滨谭睿董艳明
Owner MAINTENANCE BRANCH STATE GRID LIAONING ELECTRIC POWER
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