Method and device for localizing partial discharges in electrical cables

A partial discharge and cable technology, which is used in the field of positioning and devices for partial discharge in electrical cables, and can solve problems such as difficult positioning and inability to locate

Active Publication Date: 2018-10-02
梅格德国有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, even interference with a small magnitude may make location difficult or impossible

Method used

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  • Method and device for localizing partial discharges in electrical cables
  • Method and device for localizing partial discharges in electrical cables
  • Method and device for localizing partial discharges in electrical cables

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Embodiment Construction

[0048] In the following embodiments, the method and device for locating partial discharges in electrical cables will be jointly described in detail.

[0049] The device for localizing partial discharges 6 in electrical cables 2 essentially comprises a high-voltage power supply 1 , a decoupling unit 3 , a sensor unit 4 and a data processing system 5 .

[0050] figure 1 A device for localizing partial discharges 6 in electrical cables 2 is shown schematically.

[0051] The high-voltage power supply 1 is coupled to the cable 2 to be tested. The high voltage power supply is used to apply a high voltage up to hundreds of kilovolts to the cable 2 to be tested. For this purpose, the voltage waveform can be a direct voltage, a low frequency sinusoidal voltage, a voltage as a damped oscillation or a cosine rectangular voltage. In addition, the 50 / 60Hz grid voltage of the energy supplier can also be used.

[0052] figure 2 A schematic diagram of a sensor signal that can be assigne...

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PUM

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Abstract

The invention relates to a method and a device for locating partial discharges in electrical cables, comprising a high-voltage power supply coupled to the cable to be tested, a decoupling unit coupled to the end of the cable and via a sensor A data processing system in which the unit is connected to the decoupling unit and learns the partial discharge or partial discharges from the sensor signal when the partial discharge or partial discharges are present. The method and the device are distinguished in particular by the short evaluation duration of the positioning. This is done by identifying events, parameterizing the events identified as pulses, pairing the events identified as pulses and parameterized, classifying event pairs, assigning partial discharges according to the classification, and assigning partial discharges according to the This is achieved by determining the location of one / more partial discharges by the time-of-flight difference between the reflections.

Description

technical field [0001] The invention relates to a method and a device for locating partial discharges in electrical cables, comprising a high voltage power supply coupled to the cable to be tested, a decoupling unit coupled to the end of the cable and via a sensor unit A data processing system that is connected to the decoupling unit and learns from the sensor signal when a partial discharge or partial discharges are present. Background technique [0002] In order to keep cable failure times as low as possible, it is important for energy suppliers to detect weak points on high voltage cables early. Generation of partial discharges may be an early sign of faulty high voltage cables. In order to define defect locations within the cable, it is important to detect partial discharges and know where they are formed. [0003] A method and an electrical circuit arrangement are known from DE 37 37 373 A1 for testing the insulation of samples with a relatively high intrinsic capacit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/08G01R31/11
CPCG01R31/11G01R31/083G01R31/1272G01R31/088
Inventor 萨夏·马尔卡劳斯马尔科·屈特纳
Owner 梅格德国有限公司
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