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Method and test device for measuring partial discharge pulses of shielded cables

A partial discharge pulse and shielded cable technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of undetected discharge energy, inaccurate positioning of partial discharge, weakening, etc.

Active Publication Date: 2022-05-31
MASCHFAB REINHAUSEN GEBR SCHEUBECK GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in a considerable reduction in the measurement sensitivity
Furthermore, only a small fraction of discharges occurring far from the measuring point can be detected, since the corresponding partial discharge pulses are significantly attenuated due to signal dispersion, and therefore a large part of the discharge energy passes undetected between the core and the sheath and the capacitance between the ground connection points to flow away
This leads to inaccurate and unreliable measurements
Furthermore, localization of partial discharges is not possible or only very inaccurate due to signal dispersion and the influence of interference and noise

Method used

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  • Method and test device for measuring partial discharge pulses of shielded cables
  • Method and test device for measuring partial discharge pulses of shielded cables
  • Method and test device for measuring partial discharge pulses of shielded cables

Examples

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Embodiment Construction

[0091] The core wire has a first connection point AL1, which is provided, for example, at the first end of the cable. sheath

[0094] The coupling capacitor KK is designed as a high-voltage capacitor and comprises, for example, a plurality of capacitor windings connected in series. the capacitance

[0098] The coupling unit K is configured to measure impedance. The coupling unit comprises a preferably adaptable inductance IE and a connection

[0101] The coupling unit K shown in FIGS. 2A and 2B can be used as a coupling in a test device or method according to the improved concept

[0103] The shielded cable GK has a first connection point AL1 of the core wire and multiple, that is, N connection points AS1 of the sheath,

[0105] With this arrangement a multi-channel measurement method can be used, as described above for the method according to the improved concept

[0106] Thus, by using the method according to the improved concept, a particularly high measurement sensitivity an...

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Abstract

The invention relates to a method for measuring partial discharge pulses of a shielded cable (GK), wherein a coupling capacitor (KK) is connected to a first connection point (AL1) of the cable core. First, second and third coupling units (K1, K2, K3) are provided. The input (E) of the first coupling unit (K1) is connected to a coupling capacitor (KK). The input of the second coupling unit (K2) is connected to the first connection point (AS1) of the sheath of the cable (GK) and the input (E) of the third coupling unit (K3) is connected to the second connection point of the sheath (AS2) connection. The test voltage is applied at the first connection point (AL1) of the core. At least one characteristic value for the apparent charge of the partial discharge pulse is determined from the measurement signal.

Description

Method and test apparatus for measuring partial discharge pulses of shielded cables technical field The present invention relates to a method and a test apparatus for measuring partial discharge pulses of shielded cables, in particular for determining Characteristic value of apparent charge given for partial discharge pulses. Background technique [0002] Reference is made repeatedly to the International Standard IEC 60270 below. Such references are always understood to refer to IEC 60270: 2000+Cor.:2001+A1:2015, i.e. the third edition referenced in 2000 includes the accompanying errata 1 for 2001 and 2015 Amendment A1 of the standard. The German standard DIN EN 60270:2001+A1:2016 is consistent with this international standard. unless otherwise Explicitly stated otherwise all concepts used hereinafter are understood in accordance with standard IEC 60270. Locally confined discharges called partial discharges (TEs) that only partially bridge the insulation between c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/12G01R31/14
CPCG01R31/083G01R31/1272G01R31/14G01R31/08
Inventor E·文克尔曼
Owner MASCHFAB REINHAUSEN GEBR SCHEUBECK GMBH & CO KG