Cable insulation state voltage-withstanding detection method and detection apparatus

A technology of withstand voltage detection and cable insulation, which is applied to measuring devices, parts of electrical measuring instruments, measuring electricity, etc., can solve the problems of bulky, complex industrial digital control technology of DC step wave, and high filtering function requirements. achieve the effect of small size

Active Publication Date: 2015-10-07
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

The process of generating or requiring modulation and demodulation of ultra-low frequency sine waves requires high filtering functions, or uses rotating motors, which are bulky and not flexible enough; while the control strategy of switches in the process of generating cosine square waves is complicated, and the peak value of capacitance needs to be judged at all times
The rectangular wave is similar to the DC withstand voltage test, but only has an extra 5s commutation process, which cannot be well equivalent to the normal working state of the cable, and the modulated DC step wave requires more complex industrial digital control technology

Method used

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  • Cable insulation state voltage-withstanding detection method and detection apparatus
  • Cable insulation state voltage-withstanding detection method and detection apparatus
  • Cable insulation state voltage-withstanding detection method and detection apparatus

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] Any feature disclosed in this specification (including the abstract and drawings), unless specifically stated, can be replaced by other equivalent or similar purpose alternative features. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0031] A cable insulation state withstand voltage detection method, the specific method is:

[0032] Step 1. Applying a periodic exponential waveform voltage to the detected cable;

[0033] Step 2. Increase the applied voltage level until it reaches the maximum allowable applied vo...

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Abstract

The invention provides a cable insulation state voltage-withstanding detection method and detection apparatus. Specifically, the method comprises the following steps of exerting a periodically changing index waveform voltage on a detected cable; increasing the exerted voltage level until the maximum voltage value allowed to be exerted on the detected cable is reached or breakdown phenomena or potential breakdown risks are found during a voltage boosting process; recording the maximum voltage value and achieving detection on the cable insulation state. The index waveform voltage excitation is adopted for voltage-withstanding detection. Therefore, detection equipment is enabled to have a small volume and becomes lighter. The index waveform AC voltage has voltage commutation. Therefore, no charge accumulation effects exist.

Description

technical field [0001] The invention relates to a withstand voltage detection method and a detection device in the detection of the insulation state of power equipment, in particular to a voltage resistance detection method and a detection device suitable for the insulation state of power cables. Background technique [0002] In recent years, in order to improve the urban environment and ensure the safe and reliable operation of the power grid, distribution cables are gradually replacing traditional overhead lines and are more and more widely used in the construction of distribution networks. However, with the technological progress of my country's cable manufacturing industry in recent years and the large number of underground power cables used in urban transmission and distribution networks, the phenomenon of cable line operation failures due to defects in the insulation of the power cable body, defects in the construction and installation of cables and accessories, and def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R1/28
Inventor 李婧黄锋郭金明唐捷陈智勇邓雨荣
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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