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Transformer paper oil insulation multi-factor combined aging test device and life prediction method thereof

A technology of transformer oil and aging test, applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve the problems of transformer operating environment differences, complex device structure, complicated steps, etc., and achieve the advantages of simple operation, uniform test conditions, and improved accuracy Effect

Pending Publication Date: 2018-06-01
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aging under the comprehensive effect of multiple factors is closer to the real operating state of the transformer, but in most tests affected by multiple factors, the insulating oil is generally in a static aging state, or no vibration stress factor is added, while the transformer oil is in the actual operation process. It is in a cyclic state, and the insulating oil paper is in a vibrating environment. This device is under the comprehensive action of three stresses such as electricity, heat, and vibration, plus the thermal cycle of the oil circuit, to restore the actual working state of the insulating oil paper to the greatest extent; as in the Chinese patent application, the application number is 201510377644.7, an oil-paper insulation and electric heating combined aging sealing system; an oil-paper insulation and electric heating combined aging sealing system is proposed, which is used for strict oil-paper insulation and electric heating combined aging tests. It can realize the two influencing factors of transformer oil paper insulation, electricity and heat, and the influence of vibration stress and insulating oil circulation is not considered, which is different from the actual transformer operating environment
In addition, the currently commonly used characteristic parameters for evaluating the aging state of oil-paper insulation mainly include gas analysis in oil, micro-water content in samples, and polymerization degree testing, etc., all of which need to be sampled for measurement, and the steps are complicated and inconvenient to operate

Method used

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  • Transformer paper oil insulation multi-factor combined aging test device and life prediction method thereof
  • Transformer paper oil insulation multi-factor combined aging test device and life prediction method thereof
  • Transformer paper oil insulation multi-factor combined aging test device and life prediction method thereof

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Embodiment 1

[0037] This embodiment discloses a transformer oil-paper insulation multi-factor combined aging test device, including a test box 101, a vibration transmission device 3, a sample clamping device 2 and an oil circuit circulation device 4; the test box 101 is set on a load-bearing On the platform 102, several groups of sample holding devices 2 arranged in parallel are arranged in the test box 101, the sample holding devices 2 are connected with the vibration transmission device 3, and the test box 101 is processed There is a vacuum pumping port 104, a circulating oil inlet 105 and a circulating oil outlet 106. The circulating oil inlet 104 and the circulating oil outlet 105 on the test box 101 pass through the oil circulation pipeline 402 and the oil circulation device 4 respectively. connected, the vacuum pumping port 104 on the test box 101 is connected with the vacuum pump 501 through the pumping line 502, and the pumping valve 503 is also arranged on the pumping line 502; the...

Embodiment 2

[0044] A method for predicting the life of a transformer oil-paper insulation multi-factor combined aging test device, the method comprising the following steps:

[0045] Step a: Pretreat the insulation sample 206 and dry it under vacuum for 48 hours;

[0046] Step b: After fixing the sample splint 201, the test electrode 202, and the insulating sample 206, after connecting the relevant pipelines, after heating to the specified temperature through the insulating oil buffer 403, use the circulating oil pump 401 to inject oil into the test box 101; Turn on the vacuum pump 501 during the oil filling process to make the test chamber 101 reach the specified vacuum degree. After the oil filling is completed, continue to vacuumize to the residual pressure of 40-50Pa and keep it for 6 hours;

[0047] Step c: Make multiple groups of samples undergo accelerated aging tests under the conditions of specified temperature, voltage and vibration frequency, and at specified intervals, detect ...

Embodiment 3

[0053] A multi-factor aging life prediction method for transformer oil-paper insulation includes the following steps:

[0054] Step a: select 12cm×12cm, insulation samples with a thickness of 1mm and divide them into two groups for degradation test under different conditions. Firstly, the transformer treatment process is simulated, the insulation sample is pretreated, and dried under vacuum for 48 hours.

[0055] Step b: After fixing the insulating sample and the test electrode, connect the relevant pipelines according to the diagram, heat the insulating oil through the insulating oil buffer, and then use the circulating oil pump to fill the test box with oil; turn on the vacuum pump during the oil filling process, Make the test box reach the specified vacuum degree, continue to vacuumize to the residual pressure of 40-50Pa after oil filling, keep it for 6 hours, and then close the vacuum valve.

[0056] Step c: FDS frequency domain spectrum test is carried out on the insulat...

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Abstract

The present invention relates to the technical field of transformer paper oil insulation aging test, especially to a transformer paper oil insulation multi-factor combined aging test device and a lifeprediction method thereof. The device comprises a test box body, a vibration transmission device, test sample clamping devices and an oil-way cycle device. The test box body is arranged on a bearingplatform, the test box body is internally provided with the plurality of test sample clamping devices arranged in parallel, the test sample clamping devices are connected with the vibration transmission device, a vacuum extraction opening, a cycle oil inlet and a cycle oil outlet are processed on the test box body, the cycle oil inlet and the cycle oil outlet on the test box body are connected with an oil-way cycle device through an oil-way cycle pipeline, the vacuum extraction opening on the test box body is provided with a vacuum pump through an exhaustion pipeline, and the extraction pipeline is provided with an exhaust valve. The transformer paper oil insulation multi-factor combined aging test device and the life prediction method thereof can achieve online detection of performance degradation amount of test samples, and employ a random model to combine a traditional life calculation model to predict the life of the transformer.

Description

technical field [0001] The invention relates to the technical field of oil-paper aging test equipment, in particular to a transformer oil-paper insulation multi-factor joint aging test device and a life prediction method thereof. Background technique [0002] Oil-immersed power transformers are responsible for power transmission, distribution, and high and low voltage conversion in the power system, and their operating status directly affects the stability of the entire power system. The main insulation protection of oil-immersed transformers lies in the internal oil-paper insulation part. The perennial live operating environment, as well as the combined effects of external factors such as heat, vibration, and chemistry, lead to the gradual aging and failure of the insulating oil paper, causing various failures of the transformer, and then Cause fluctuations in the power system, and even directly cause interruptions in power supply. Therefore, it is of great significance to...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/12
CPCG01R31/003G01R31/1263
Inventor 刘骥张伟丽张明泽齐朋帅廖俐琳孙宇飞许鹤林
Owner HARBIN UNIV OF SCI & TECH
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