Method and device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line

A three-phase cable and cross-connection technology, which is applied in measuring devices, measuring electrical variables, and testing dielectric strength, etc., can solve the problems of on-line monitoring of the main insulation of three-phase cables under the cross-connection of metal sheaths, etc.

Inactive Publication Date: 2013-01-16
HARBIN UNIV OF SCI & TECH +1
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Problems solved by technology

[0003] The present invention aims to solve the problem that the main insulation of the three-phase cable under the cross-connection of the metal sheath cannot be monitored online at present, thereby proposing an on-line monitoring method and device for the main insulation of the three-phase cable under the cross-connection of the metal sheath

Method used

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  • Method and device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line
  • Method and device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line
  • Method and device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line

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specific Embodiment approach 1

[0023] Specific implementation mode 1. Combination Figure 1 to Figure 3 Illustrate this specific implementation mode, the online monitoring method of three-phase cable main insulation under the cross interconnection of metal sheath, it is realized by the following steps:

[0024] Step 1. Connect the current and voltage transformers at the two terminals of the three-phase cable respectively, use a pair of current transformers to collect the current value at both ends of each phase cable, and use a pair of I-V conversion and protection circuits to collect the current values ​​of each phase collected. The current value at both ends of the cable is converted to I-V; a pair of voltage transformers is used to collect the voltage value at both ends of each cable;

[0025] Step 2, using a pair of multi-channel synchronous analog / digital conversion circuit ADC to sample the three-phase conversion values ​​output by a pair of I-V conversion and protection circuits respectively, to obta...

specific Embodiment approach 2

[0046] Specific embodiment 2. The on-line monitoring device for the main insulation of three-phase cables under the metal sheath cross interconnection, the device includes three pairs of current transformers, three pairs of voltage transformers, two three-way I-V conversion circuits, two six-way synchronous mode / A digital conversion circuit and a central processing unit; wherein the two three-way I-V conversion circuits are respectively located at the two ends of the three-phase cable under test, and the two six-way synchronous analog / digital conversion circuits are respectively located at the two ends of the three-phase cable under test ;

[0047] Each pair of current transformers is used to respectively detect the current signals at both ends of a phase cable;

[0048] Each pair of voltage transformers is used to separately detect the voltage signals at both ends of a phase cable;

[0049] The current signal output terminals of the three current transformers located at one...

specific Embodiment approach 3

[0052] Embodiment 3. The difference between this embodiment and the online monitoring device for the main insulation of the three-phase cable under the metal sheath cross-connection described in Embodiment 1 is that each three-way I-V conversion circuit includes a protection circuit. To achieve over-current and over-voltage protection.

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Abstract

The invention discloses a method and a device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line, relates to a method and a device for monitoring the main insulation of the three phases of cables on line, and aims to solve the problem that the conventional method and the conventional device cannot be used for monitoring the insulation performance of the three phases of cables under intersection and interconnection of the metal protective layers on line. Current flowing through wire cores at two ends of each phase of cable is measured by using two current transformers; a difference value is calculated, so that a current value flowing through the main insulation of the cable is obtained; due to measurement for three phases of voltage by a voltage transformer, a dielectric loss factor of the main insulation of each phase of cable can be monitored on line; and therefore, the main insulation of the three phases of cables can be monitored on line. A plurality of paths of synchronous analog/digital conversion chips at two ends are controlled to perform synchronous sampling through a global positioning system (GPS) satellite synchronous signal, and calculation is performed in a computer, so that the main insulation of the three phases of cables under intersection and interconnection of the metal protective layers can be monitored on line. The method and the device are suitable for on-line monitoring of the insulation performance of the three phases of cables under intersection and interconnection of the metal protective layers.

Description

technical field [0001] The invention relates to an online monitoring method and device for the main insulation of a three-phase cable. Background technique [0002] The metal sheaths of long-distance three-phase cables need to be cross-connected to eliminate the induced voltage between three-phase cables, but this interconnection method has brought great difficulties to online monitoring technology. At present, it is not possible to conduct online monitoring of the insulation performance of three-phase cables under metal sheath cross-connection. Contents of the invention [0003] The invention aims to solve the current problem that the main insulation of the three-phase cable under the cross-connection of the metal sheath cannot be monitored online, thereby proposing an on-line monitoring method and device for the main insulation of the three-phase cable under the cross-connection of the metal sheath. [0004] An online monitoring method for the main insulation of three-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R27/26
Inventor 魏新劳朱博刘通刘智宏李锐海王国利
Owner HARBIN UNIV OF SCI & TECH
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