A Partial Discharge Pulse Separation Method for High-Voltage Power Equipment
A partial discharge pulse, high-voltage power equipment technology, applied in the direction of testing dielectric strength, etc., can solve problems such as separation work difficulties, achieve a wide application range and improve accuracy
Active Publication Date: 2016-08-17
GUANGDONG POWER GRID CO LTD +1
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But if the two types of discharge pulses have similar TF signatures, the separation will run into difficulties
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[0033] The partial discharge pulse separation method of high-voltage power equipment proposed by the present invention includes the following steps:
[0034] (1) Set a discharge pulse threshold, and continuously collect partial discharge pulse sequences whose discharge pulse amplitude exceeds the set discharge pulse threshold from high-voltage power equipment to obtain multiple partial discharge pulse sequences and the corresponding partial discharge pulse sequence Power frequency voltage phase, according to the partial discharge pulse sequence and power frequency voltage phase, the partial discharge spectrum phase diagram (phase resolved partial discharge pattern, PRPD spectrum diagram) of the high voltage power equipment is obtained as figure 1 Shown
[0035] (2) According to the following formula, extract the partial discharge pulse form factor K, equivalent duration T, and equivalent frequency F from the above multiple partial discharge pulse sequences:
[0036] K = V ...
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The invention relates to a local discharge pulse separating method for high-voltage power equipment, and belongs to the technical field of high-voltage equipment monitoring. The method comprises the following steps: acquiring a local discharge pulse sequence of which the amplitude surpasses a set threshold value from the high-voltage power equipment to obtain a local discharge spectrum phase diagram of the high-voltage power equipment according to the sequence and a corresponding power frequency voltage phase; extracting waveform factors, equivalent durations and equivalent efficiencies from the sequence, solving average values respectively, and normalizing by taking the average values as factors; drawing a feature spectrogram of KT, KF, TF and KTF according to a processing result; classifying the discharge types of discharge pulses on the feature spectrogram, and drawing local discharge spectrum phase diagrams of different discharge types according to the mapping relation between the type of the feature spectrogram and the discharge spectrum phase diagram. By adopting the method, the separating accuracy of different types of local discharge pulses is increased. The method plays an important role in local discharge offline measurement, electrified detection, online monitoring and fault diagnosis of the high-voltage power equipment.
Description
Technical field [0001] The invention relates to a partial discharge pulse separation method for high-voltage power equipment, in particular to a partial discharge pulse separation method for high-voltage power equipment based on amplitude domain-time domain-frequency domain, and belongs to the technical field of high-voltage equipment monitoring. Background technique [0002] Partial discharge in some weak parts of the insulation of high-voltage power equipment under the action of high electric field is a common problem in high-voltage insulation. Under certain conditions, it will lead to insulation degradation and even breakdown. Detecting the partial discharge of the equipment in time, and identifying the type and severity of the discharge, will help detect latent faults and avoid sudden accidents. [0003] The pulse current method is widely used in partial discharge measurement. The current upper limit frequency recommended by the IEC standard IEC60270 and the Chinese national s...
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IPC IPC(8): G01R31/12
Inventor 陈锡阳高胜友夏云峰黄健华曾嵘林建华杨挺何文桂峻峰
Owner GUANGDONG POWER GRID CO LTD