Cold resistance test method for cross-linked polyethylene insulation and cold resistance power cable
A technology for cross-linked polyethylene and power cables, which is applied in the direction of testing the dielectric strength and testing the strength of materials by applying repeated force/pulsation force, which can solve problems such as the inability to determine the cold resistance of the cable and the normal use of the cable.
Inactive Publication Date: 2011-11-09
JIANGSU HENGTONG POWER CABLE
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Problems solved by technology
XLPE insulated cold-resistant power cable is a kind of cable commonly used in cold regions. However, at present, there is no cold-resistant test method for XLPE insulated cold-resistant power cables in power cable manufacturers or research units, and it is impossible to determine the strength of the cable. Good cold resistance performance, can not guarantee the normal use of the cable in cold regions
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[0015] When the present invention is specifically implemented, it is carried out according to five steps of sample pretreatment, low temperature bending experiment, partial discharge experiment, AC voltage experiment and standing experiment. The experiment content of each step is as follows:
[0016] 1. Sample pretreatment: Place the sample of the cross-linked polyethylene insulated cold-resistant power cable in an experimental environment at a temperature of -15±3°C for no less than 24 hours;
[0017] 2. Low-temperature bending experiment: In an experimental environment at a temperature of -15±3℃, the sample is wound on the surface of the cylinder for no less than 3 times and then loosened and straightened, and then reversed for no less than 3 times and then loosened and straightened. , Repeat the forward and reverse winding no less than 10 times, the diameter of the cylinder should be: 20(D+d)±5% mm for single-core cable experiment, 15(D+d) for three-core cable experiment ) ±5% m...
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The invention relates to a cold resistance test method for a cross-linked polyethylene insulation and cold resistance power cable. The method comprises five steps of a sample pretreatment, a low temperature bending test, a partial discharge test, an alternating voltage test and a standing test. With the cold resistance test with the five steps provided by the present invention, a cable can be determined whether the cable has good cold resistance performance. If indexes of the cable meet requirements of each step, the results show that the cable has good cold resistance performance and can be normally used in a cold area; otherwise, the results show that the cable does not have good cold resistance performance and can not be normally used in the cold area.
Description
Technical field [0001] The invention relates to a cold resistance test method for cables, in particular to a cold resistance test method for cross-linked polyethylene insulated cold-resistant power cables. Background technique [0002] Power cables laid in cold areas (such as my country's northeast and northwest regions) are in an environment below 0°C for 3-5 months each year. The power cable laid in this cold environment must have good cold resistance to ensure that the cable sheath will not freeze, the cable insulation performance will not decrease, and the cable life will not be reduced in normal use. Therefore, the product must undergo a cold resistance test before leaving the factory to determine the good cold resistance performance of the cable and ensure the normal use of the cable in the cold zone. Cross-linked polyethylene insulated cold-resistant power cable is a kind of cable commonly used in cold areas. However, currently there is no cold-resistant test method for c...
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IPC IPC(8): G01N3/32G01R31/12
Inventor 肖云涛林磊刘辉郭俭旭
Owner JIANGSU HENGTONG POWER CABLE