A Method for Evaluating the Aging State of XLPE Cables Based on Leakage Current Characteristic Factors
A technology of leakage current and eigenfactor, applied in the direction of measuring current/voltage, measuring only current, measuring electricity, etc., can solve problems such as cable faults and threats to the safe operation of the power grid, so as to reduce workload, improve operation and maintenance effects, and facilitate calculation Effect
Active Publication Date: 2021-08-10
YUNNAN POWER GRID CO LTD LINCANG POWER SUPPLY BUREAU
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Problems solved by technology
If the aging cables are not replaced in time, it is easy to cause cable failure, which seriously threatens the safe operation of the power grid
Method used
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Embodiment Construction
[0034] Step 1: Build a cable leakage current test platform
[0035] Build a cable insulation aging test platform, connect the No. 1 port 5 of the high-frequency voltage source 3 to the terminal 8 of the test cable 16 through the high-voltage test line 7, and insert the No. 1 high-frequency current transformer 9 into the No. 1 grounding of the test cable 16 Line 10, put No. 2 high-frequency current transformer 11 into No. 2 grounding wire 12 of test cable 16, connect No. 1 high-frequency current transformer 9 to data collector 2 through No. 1 signal transmission line 13, and connect No. 2 high-frequency current transformer 9 The frequency current transformer 11 is connected to the data collector 2 through the No. 2 signal transmission line 14, the data collector 2 is connected to the host computer 1 through the No. 3 signal transmission line 15, and the No. 1 port 4 of the high-frequency voltage source 1 is grounded through No. 3 Line 6 is grounded;
[0036] Step 2: Set the co...
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The present invention is a cable insulation aging state evaluation method based on the characteristic factor of leakage current. The present invention first builds a cable leakage current test platform to test the leakage current of XLPE cables in long-term operation; then calculates No. 1 high-frequency current transformer (6) Leakage current characteristic parameters and aging coefficient of leakage current characteristic parameters of No. 2 high-frequency current transformer (8) Finally, the aging state of the XLPE cable insulation is evaluated by calculating the leakage current difference coefficient, so as to ensure the safe operation of the cable. The beneficial effect of the present invention is that the aging state of XLPE cables can be evaluated based on the detected leakage current and the calculated characteristic factor, which has the characteristics of simple data collection and convenient calculation, and can accurately and efficiently evaluate the Measure the aging degree of cable insulation, provide reliable guidance for on-site operation and maintenance personnel to carry out targeted cable maintenance and repair, and achieve the purpose of reducing workload and improving operation and maintenance effects.
Description
technical field [0001] The invention belongs to the field of evaluating the aging state of XLPE cable insulation, and in particular relates to a method for evaluating the aging state of XLPE cables based on leakage current characteristic factors. Background technique [0002] With the gradual acceleration of domestic urbanization, the use of power cables is becoming more and more common. Cables have many advantages such as not being easily affected by the environment, low maintenance rate, and safety. At present, most of the electricity used in cities is powered by power cables. Cross-linked polyethylene (XLPE) is widely used in distribution network cables due to its simple structure, light weight, good heat resistance, high load capacity and high mechanical strength. But on the other hand, once the power cable fails, the complex cable laying environment and the fault location technology are not perfect enough to easily lead to a long-term power outage, which will directly a...
Claims
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IPC IPC(8): G01R31/12G01R31/00G01R19/00G01R31/52G01R31/58
CPCG01R19/0092G01R31/003G01R31/1272
Inventor 黄继盛项恩新徐肖伟
Owner YUNNAN POWER GRID CO LTD LINCANG POWER SUPPLY BUREAU