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Using values of PRPD envelope to classify single and multiple partial discharge (PD) defects in HV equipment

A technology for partial discharge and high-voltage motors, which is applied in the directions of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., and can solve problems such as insulation damage

Inactive Publication Date: 2014-03-19
SAUDI ARABIAN OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0012] The amplitude of the partial discharge pulse also contains useful information, since a pulse of greater amplitude results in greater damage to the insulation

Method used

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  • Using values of PRPD envelope to classify single and multiple partial discharge (PD) defects in HV equipment
  • Using values of PRPD envelope to classify single and multiple partial discharge (PD) defects in HV equipment
  • Using values of PRPD envelope to classify single and multiple partial discharge (PD) defects in HV equipment

Examples

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Embodiment Construction

[0029] like figure 2 As shown, method 200 begins at step 210 in which in-line PD inspections are recorded for a plurality of electric machines known to contain the following categories of defects: internal PD, corona PD, slot PD, terminal winding PD, and surface PD. In addition, online PD detection is recorded for a number of known functioning motors. Preferably, the analysis may include at least 50 motors of each type, for a total of 300 motors.

[0030] like image 3 As shown, there are several sensor options for detecting PD, including high voltage coupling capacitors, permanent internal high frequency coupling capacitors ("HPCT"), or portable clip-on HFCTs (high frequency current transformers). In a preferred alternative embodiment, a Rogowski coil (Rogowski Coil) is used to replace the HPCT. A Rogowski coil is a helical coil of wire wrapped around a straight conductor whose current is to be measured, with the lead from one end of the Rogowski coil returning to the oth...

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Abstract

A method, system and computer program product for classifying types of partial discharge experienced by high voltage motors, reducing the labor and expertise required for such classification. This method, system and computer program product utilize feature extraction techniques to preprocess partial discharge measurements data to suit neural network input requirements.

Description

technical field [0001] The present invention relates to a method, system and computer program product for classifying the type of partial discharge experienced by a high voltage electrical machine, thereby reducing the labor and expertise required for such classification. Background technique [0002] Electric motors play a key role in various factory processes for electromechanical energy conversion. Therefore, its reliability and availability are very important to the industry. Motors are generally durable and reliable, but motors do experience fatigue from aging, and sometimes newer motors can fail due to design flaws, incorrect operating conditions, or improper installation. [0003] Motor failures can be caused by mechanical faults such as broken rotor bars, broken end rings, damaged motor bearings or air gap eccentricity, or they can be caused by electrical faults such as shorted stator windings or unbalanced supply voltages. EPRI and IEEE surveys of motor failures f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/28
CPCG01R31/343G01R31/1227G01R31/34G01R31/12
Inventor Y·A·阿塞里
Owner SAUDI ARABIAN OIL CO
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