Evaluation method for health state of XLPE cable based on current distribution state of grounding wire

A technology of health status and current distribution, applied in the direction of measuring current/voltage, only measuring current, measuring electricity, etc., can solve problems such as bursting, affecting the safe operation of distribution network, and deteriorating health status, to improve effectiveness and data collection. The method is easy to implement and the data collection method is simple.

Active Publication Date: 2020-04-17
YUNNAN POWER GRID CO LTD LINCANG POWER SUPPLY BUREAU +1
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  • Application Information

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Problems solved by technology

However, with the increase of running time, the health of XLPE cables will continue to deteriorate due to factors such as the natural environment, self-heating, extrusion and bending, and in severe cases, failures such as bursting may occur, which greatly affects the safety of the distribution network run

Method used

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  • Evaluation method for health state of XLPE cable based on current distribution state of grounding wire
  • Evaluation method for health state of XLPE cable based on current distribution state of grounding wire
  • Evaluation method for health state of XLPE cable based on current distribution state of grounding wire

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Embodiment Construction

[0027] The present invention will be further described below:

[0028] according to figure 1 The wiring diagram of the cable ground wire current test platform, the specific calculation steps of the present invention are as follows:

[0029] Step 1: Build a cable leakage current test platform

[0030] Connect the No. 1 port 2 of the voltage source 1 to the terminal 5 of the test cable 4 through the high-voltage test line 3, insert the No. 1 current transformer 6 into the No. 1 grounding wire 7 of the test cable 4, and put 8 sets of No. Connect the No. 2 ground wire 9 of the test cable 4, connect the No. 1 current transformer 6 to the data collector 11 through the No. 1 signal transmission line 10, and connect the No. 2 current transformer 8 to the data collector 11 through the No. 2 signal transmission line 12 Connect the data collector 11 to the host computer 14 through the No. 3 signal transmission line 13, and connect the No. 2 port 15 of the voltage source 1 to the ground...

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Abstract

The invention relates to an evaluation method for the health state of an XLPE cable based on the current distribution state of a grounding wire. In the invention, the method comprises the steps of firstly, building a cable grounding wire current testing platform to carry out grounding wire current testing on the XLPE cable operating in a power distribution network, acquiring a current signal of the grounding wire, then calculating a distribution proportionality coefficient and a distribution state coefficient of grounding wire current, and finally, evaluating the health state of the XLPE cablethrough the distribution state coefficient of the grounding wire current, thereby providing a guarantee for ensuring safe operation of the cable in the power distribution network. The beneficial effects are that the acquired current signal of the grounding wire can be quickly processed, the detection effectiveness is improved, the health state of the XLPE cable can be evaluated timely and effectively according to a related judgment basis, and reliable help is provided for a field worker to carry out the maintenance of the cable.

Description

technical field [0001] The invention belongs to the field of health state evaluation of XLPE cables, and in particular relates to a method for evaluating the health state of XLPE cables based on the current distribution state of grounding wires. Background technique [0002] XLPE cables have excellent electrical performance and mature manufacturing technology. At present, XLPE cables are widely used as transmission lines in my country's distribution network. However, with the increase of running time, the health of XLPE cables will continue to deteriorate due to factors such as natural environment, self-heating, extrusion and bending, and in severe cases, failures such as bursting may occur, which greatly affects the safety of the distribution network run. [0003] Timely evaluation of the health status of cables in operation is an effective measure to reduce the number of faults and reduce the risk of faults. In order to ensure that the health status of the cable will not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/00G01R31/52G01R31/58
CPCG01R31/003G01R19/0092
Inventor 项恩新王科黄继盛
Owner YUNNAN POWER GRID CO LTD LINCANG POWER SUPPLY BUREAU
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