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Test method for verifying reliability of transition joint

A technology for transition joints and test methods, which is applied in environmental/reliability testing, measuring devices, instruments, etc., can solve the problems of lack of systematic test methods for transition joints of oil-paper insulated cables and cross-linked insulated cables, and improve the test accuracy. , good electrical performance, the effect of improving safety

Active Publication Date: 2016-08-31
ZHEJIANG ZHOUSHAN OCEAN POWER TRANSMISSION RES INST CO LTD +3
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AI Technical Summary

Problems solved by technology

[0004] The International Conference on Large Power Grids (CIGRE) has formulated electrical test standards for oil-paper insulated cables and cross-linked insulated cables. Standard ELECTRA 189b specifies the test methods for oil-paper insulated DC cables and their accessories with a rated voltage of 800kV and below. Standard CIGRE TB 496 specifies The test method for extruded insulated DC cable system with rated voltage 500kV and below, but there is still a lack of systematic test method for the transition joint between oil-paper insulated cable and cross-linked insulated cable

Method used

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  • Test method for verifying reliability of transition joint
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  • Test method for verifying reliability of transition joint

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Embodiment Construction

[0032] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings of the description;

[0033] like figure 1 Shown, the present invention comprises the steps:

[0034] 1) Install the test loop and simulation loop. Install the test circuit according to the method of "dry terminal 1 + cross-linked insulated cable 2 + transition joint 3 + oil-paper insulated cable 4 + transition joint 5 + cross-linked insulated cable 6 + dry terminal 7", as attached figure 2 As shown, the length of each section of cable is at least 8m; connect the oil-paper insulated cable 11 and the cross-linked insulated cable 12 to form a simulated circuit, as shown in the attached image 3As shown, the length of each section of cable is at least 8m, and each section of cable is equipped with three thermocouples 13 to measure the conductor temperature, and the installation distance of thermocouples 13 should not be less than 0.5m. ...

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Abstract

The invention relates to a test method for verifying the reliability of a transition joint. Currently, there is no effective and accurate test method for the transition joint. The method comprises the following steps: installing a test loop and a simulation loop; determining a temperature control cable; carrying out a load cycle test of the test loop; carrying out a DC overlapping operation impulse voltage test of the test loop; carrying out a DC overlapping lightning impulse voltage test; and carrying out inspection after testing. According to the technical scheme of the invention, through the temperature monitoring of the simulation loop, the method achieves the accurate control of the wire temperature of the test loop, and improves the accuracy of the testing of the reliability of the transition joint. Moreover, the temperature control cable is determined, thereby facilitating the improvement of the testing safety, and enabling the test to be carried out smoothly.

Description

technical field [0001] The invention relates to a test method for verifying the reliability of transition joints, in particular to a test method for verifying the reliability of transition joints of oil-paper insulated cables and cross-linked insulated cables. Background technique [0002] In the last century, oil-paper insulated electric (submarine) cables were widely used in international and domestic power transmission projects, but with the continuous development of cross-linked polyethylene insulated cable technology, oil-paper insulated cables are gradually replaced by their advantages of convenient installation and maintenance, safe and reliable operation, etc. , Oil-paper insulated cables are also gradually tending to be discontinued. However, a large number of oil-paper insulated cables that are still in operation will inevitably have various faults, and there is a risk that there will be no cables available after a fault occurs. [0003] The oil-paper insulated ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/003
Inventor 俞恩科乐彦杰郑新龙丁小兵敬强高震甘纯陈国志张磊沈耀军
Owner ZHEJIANG ZHOUSHAN OCEAN POWER TRANSMISSION RES INST CO LTD
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