Method and device for locating partial discharges in electric cables

A partial discharge and cable technology, which is used in the field of localization and device for partial discharge in electrical cables, can solve the problems of inability to locate, difficult to locate, etc., and achieve the effect of improving the positioning results

Active Publication Date: 2016-07-13
梅格德国有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, even interference with a small magn

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  • Method and device for locating partial discharges in electric cables
  • Method and device for locating partial discharges in electric cables
  • Method and device for locating partial discharges in electric cables

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Embodiment Construction

[0047] In the following embodiments, the method and device for locating partial discharges in electrical cables will be jointly described in detail.

[0048] 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 .

[0049] figure 1 A device for localizing partial discharges 6 in electrical cables 2 is shown schematically.

[0050] 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.

[0051] figure 2 A schematic diagram of a sensor signal that can be assigne...

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Abstract

The invention relates to methods and devices for locating partial discharges in electric cables, comprising a high-voltage source which is coupled to the cable to be tested, an outcoupling unit which is connected to one end of the cable, and a data processing system which is connected to the outcoupling unit via a sensor unit and which ascertains a partial discharge or partial discharges from the sensor signals when present. The methods and devices are characterized in particular by a short analysis duration of the locating process. This is achieved by detecting events, parameterizing the events detected as pulses, pairing the parameterized events which are detected as pulses, classifying the event pairs, assigning a partial discharge on the basis of the classification, and determining the location of the partial discharge(s) from the delay between the respective partial discharge and the reflection corresponding to the partial discharge.

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 a circuit arrangement are known from DE 3737373 A1 for testing the insulation of samples with a relatively high intrinsic capacitance and for l...

Claims

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Application Information

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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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