Locating and diagnosing method of partial discharge caused by internal loosening of high-voltage electrical equipment

Abstract

The invention belongs to the electrical technology field, and particularly relates to a localization diagnosis method for partial discharge generated by looseness in high-voltage electrical equipment. The localization diagnosis method for the partial discharge generated by the looseness in the high-voltage electrical equipment comprises the following steps: firstly, collecting a partial discharge signal; determining that a signal collection point is correct; analyzing to determine whether partial discharge is in the presence; filtering the collected signal; by continuous practice, finding that frequency bands in which different partial discharge abnormities are positioned are different and duration and phase for generating partial discharge are different; positioning the partial discharge; and determining a discharge point according to the signal transmission characteristic. The localization diagnosis method for the partial discharge generated by the looseness in the high-voltage electrical equipment, which is disclosed by the invention, has the technical key and innovation points that the frequency band in which the partial discharge signal caused by the looseness of high-voltage electrical equipment is in the presence is found, the continuous discharge time is short, and a collected current signal can be reliably subjected to conversion positioning because a voltage signal is different to collect. The localization diagnosis method has the beneficial effects that the partial discharge caused by poor contact due to the looseness of high-voltage electrical equipment can be quickly and accurately analyzed on line with the detection and analysis method, detection and analysis are accurate, and positioning is reliable.

Description

technical field [0001] The invention belongs to the field of electrical technology, and in particular relates to a method for locating and diagnosing partial discharges generated by internal loosening of high-voltage electrical equipment. Background technique [0002] With the rapid development of the national economy and our country's demand for energy, especially the demand for electric energy continues to increase. The improvement of the voltage level of the power system makes the insulation problem of electrical equipment more and more prominent. Once the large electrical equipment (such as generators, transformers) and small equipment (such as power capacitors, insulators, etc.) The power outage in the whole region has caused serious adverse consequences to the production and operation of other sectors of the national economy. In order to ensure the safe and reliable operation of electrical equipment insulation, on the one hand, it is necessary to use good insulating m...

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Problems solved by technology

Both the International Electrotechnical Commission (IEC) and my country have formulated offline partial discharge detection standards, but there is no detection standard for partial discharge online detection due to technical problems.

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