Testing method for on-line monitoring internal insulation incipient fault of electric equipment

A technology for power equipment and internal insulation, applied in the direction of testing dielectric strength, etc., can solve problems such as inability to effectively prevent sudden failure of power equipment and affect power supply

Inactive Publication Date: 2005-04-13
欧阳南尼
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the currently adopted methods can effectively prevent sudden failures of power equipment.
Therefore, in order to discover the hidden dangers of internal insulation of power equipment in advance, people still have to take measures of power outage maintenance, which seriously affects the normal power supply.

Method used

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  • Testing method for on-line monitoring internal insulation incipient fault of electric equipment
  • Testing method for on-line monitoring internal insulation incipient fault of electric equipment
  • Testing method for on-line monitoring internal insulation incipient fault of electric equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: A test method for on-line monitoring of hidden dangers of insulation inside a transformer.

[0013] like figure 1 Shown:

[0014] 1. From the strong magnetostrictive amorphous alloy sensors K1 and K2 installed on the high-voltage bushing of the transformer in a non-core-through installation method, the strong magnetostrictive amorphous alloy sensors K3 and K4 on the neutral point bushing, and the low-voltage The strong magnetostrictive amorphous alloy sensors K5 and K6 on the bushing, and the strong magnetostrictive amorphous alloy sensors K7 and K8 on the core grounding bushing collect the impact high frequency and large current signal as the excitation signal and response signal of the transformer transfer function , calculate the transfer function curve of the wave process when the high frequency and large current impacts the transformer each time, according to the change of the transfer function curve, analyze the impact high frequency and large curre...

Embodiment 2

[0018] Embodiment 2: A test method for on-line monitoring of hidden dangers of insulation inside a transformer.

[0019] as shown in picture 2:

[0020] From the strong magnetostrictive amorphous alloy sensors K1 and K2 installed on the high-voltage bushing of the transformer in the non-core-through installation method, and the strong magnetostrictive amorphous alloy sensors K3 and K4 on the grounding bushing, the impact high-frequency large The current signal is used as the excitation signal and response signal of the transfer function of the transformer equipment, and the transfer function curve of the time wave process of each high-frequency and large current impact on the transformer is calculated. According to the change of the transfer function curve, the collected high-frequency and large current waveform is studied. Analysis, and in conjunction with other routine tests, real-time evaluation and fault diagnosis of transformer insulation performance.

[0021] The signal...

Embodiment 3

[0022] Embodiment 3: A test method for on-line monitoring of hidden dangers in the internal insulation of lightning arresters.

[0023] like image 3 Shown:

[0024] Collect high-frequency and high-current signals from the strong magnetostrictive amorphous alloy sensors K1 and K2 installed on the high-voltage bushing of the arrester in a non-core-through installation method, and the strong magnetostrictive amorphous alloy sensors K3 and K4 on the grounding bushing As the excitation signal and response signal of the transfer function of the arrester equipment, calculate the transfer function curve of the time wave process of each high-frequency and large-current impact arrester, and analyze the collected high-frequency and large-current waveform according to the change of the transfer function curve, and cooperate with Other routine tests, real-time evaluation and fault diagnosis of arrester insulation performance.

[0025] The signals collected by the above-mentioned strong ...

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Abstract

The invention discloses a testing method for on-line monitoring internal insulation incipient fault of electric equipment, wherein a sensing unit is employed for collecting collision high-frequency heavy current signal from power transmission bus wire and earthed sheathed tube port, the correlation between the waveform, amplitude and time of the collected shock transient signal is utilized to select the excitation signal and response signal of the power equipment transfer function and establish the internal transfer function curve of the power equipment.

Description

technical field [0001] The invention relates to a test method for on-line monitoring of internal insulation hidden dangers of power equipment in a power transmission and transformation system, which is suitable for online state maintenance of power equipment (such as: transformers, transformers, lightning arresters, and circuit breakers) in power system 35kV-150kV substations. monitor. Background technique [0002] At present, domestic and foreign researches on online monitoring technology for internal insulation hazards of power equipment have been carried out for many years. People have developed a variety of technical methods for online detection of internal insulation hazards of power equipment, such as: temperature method, pressure method, chromatography, etc. method, ultrasonic method, pulse current method, ultra-high frequency method, etc. However, none of the currently adopted methods can effectively prevent sudden failures of electrical equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 欧阳南尼
Owner 欧阳南尼
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