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Device and method for testing dielectric loss of high voltage transformer

A technology of dielectric loss and testing device, applied in measuring devices, instruments, measuring electrical variables, etc., can solve the problems of high voltage test pressure difficulty, inability to complete the dielectric loss test of 500KV high-voltage transformers, etc., to ensure safety and improve measurement. The effect of precision

Active Publication Date: 2011-09-14
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0003] The high-voltage transformer dielectric loss testing device provided by the present invention solves the technical problem that the high-voltage test pressurization difficulty existing in the prior art cannot complete the 500KV high-voltage transformer dielectric loss test

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  • Device and method for testing dielectric loss of high voltage transformer
  • Device and method for testing dielectric loss of high voltage transformer
  • Device and method for testing dielectric loss of high voltage transformer

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Embodiment Construction

[0021] The high-voltage transformer dielectric loss testing device includes a frequency conversion circuit 1, a control circuit 2, a step-up transformer 3, a series harmonic inductor L4 and a Xilin bridge 5, the two output terminals of the frequency conversion circuit 1 and the step-up transformer 3 The two input ends are electrically connected together, one output end of the step-up transformer 3 is electrically connected to one end of the series harmonic inductor L4, the other output end of the step-up transformer 3 is grounded, and the other end of the series harmonic inductor L4 is respectively connected to the One end of the standard capacitor 7 is electrically connected to one end of the tested high voltage transformer 8, and the other end A of the standard capacitor 7 is connected in parallel with the non-inductive fixed resistance R 4 and adjustable capacitor C 4 One end of the electrical connection, parallel non-inductive fixed resistance R 4 and adjustable capacitor...

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Abstract

The present invention discloses a device and method for testing dielectric loss of a high voltage transformer, solving the problem that pressurization of high voltage test is difficult, and dielectric loss test of the high voltage transformer of 500 KV can not be finished in the prior art. The device for testing the dielectric loss of the high voltage transformer comprises a frequency conversion circuit (1), a control circuit (2), a booster transformer (3), a series resonance inductor L(4) and a schering bridge (5), wherein two output ends of the frequency conversion circuit (1) are electrically connected with two input ends of the booster transformer (3), one output end of the booster transformer (3) is electrically connected with one end of the series resonance inductor L(4), the other output end of the booster transformer (3) is grounded, and the other end of the series resonance inductor L(4) is respectively connected with the schering bridge (5) formed by a standard capacitor (7), a tested high voltage transformer (8), a non-inductance fixed resistance R4, an adjustable capacitor C4 and a non-inductance adjustable resistance R3 so as to realize scientific test of the dielectric loss of the high voltage transformer, wherein the non-inductance fixed resistance R4, the adjustable capacitor C4 and the non-inductance adjustable resistance R3 are connected in parallel.

Description

technical field [0001] The invention relates to a device and a testing method for on-site automatic measurement of high-voltage dielectric loss for a transformer with a voltage level of 500KV. Background technique [0002] The measurement of the dielectric loss of the transformer is an important means to judge the overall deterioration of the insulation of the power equipment such as damp and aging. At present, the dielectric loss test of transformers below 10KV is generally carried out in the industry. Since the test voltage is far from the rated working voltage, it cannot effectively reflect the insulation status of the equipment. Existing equipment and test methods cannot complete the dielectric loss test of 500KV high-voltage transformer due to the difficulty of high-voltage test pressurization. At the same time, due to the manual step-up of power frequency, it is interfered by the power frequency on site, resulting in inaccurate test data and affecting the Accurate jud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
Inventor 王天正杨杰武国亮孙凤俊
Owner STATE GRID CORP OF CHINA
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