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Discussion On Deficiency Of Domestic Partial Discharge Test System And Suggestions For Improvement
May 06, 2018

 The electric gate in the shielding Chamber of domestic partial discharge test system is an easy problem in the present experiment. Due to the large area of the gate, heavy weight, mechanical transmission, the design of the chain device unreasonable and the test process misoperation, and other factors, sometimes occurs when the door opened closed the phenomenon of card death, which not only on the Electric door travel guide and mechanical transmission gear damage, And seriously affected the cable normal test work smoothly. At the same time, because of the large inertia of the door opening and closing process of the cable, the impact of the opening and closing to the mechanical part of the equipment is larger, and the chance of the electric door appearing problem is increased. Due to the design and construction of the whole partial discharge test system, the fine design and installation of the gate of electric shielding room are often neglected, and the design process is generally rough, which makes the use, maintenance and repair of the latter more difficult and troublesome. Therefore, for the shielding room door transmission device reasonable, fine design and production, but also to cause the test equipment manufacturers to attract enough attention and attention.


So as to ensure that the door of the shielding room is smooth, easy, reliable open and close, reduce the failure rate of equipment. The configuration of the cable mobile loading trolley design is relatively rough. The partial discharge test of cable has both semi-finished products and finished products. In the partial discharge test of semi-finished products, in order to reduce the test background, the semi-finished metal is required to use insulating pads and car isolation. In order to avoid the semi-finished copper tape shield through the grounding wire and iron, trolley, trolley track road, shielding room to form a cycle of grounding, resulting in the test background increased. In order to ensure the smooth progress of the semi-finished product test, the cable trolley should be fitted with a pressure-resisting wear-resistant and a certain thickness insulation substrate to achieve the insulation isolation of semi-finished and trolley. Throughout the domestic test equipment configuration of the car, this part of some manufacturers to improve the installation, but slightly older equipment are not insulated substrate.


Cable manufacturers in the Semi-Finished Products bureau and fault location, can only temporarily find some PVC sheathed leather pad in the cable and the car contact four corner, to avoid repeated grounding of semi-finished products. The track of the cable moving trolley has an active track in the door position of the shielding chamber, the actual and configuration of the bridge is very rough, and there are serious design and manufacturing defects. Often caused by the car at the location of the bridge jump derailment phenomenon, into the shielding room door of the positive and negative stroke track slot. It is actually a time-consuming and laborious task to transfer a trolley loaded with a cable from the front and back track of the shield chamber.


Therefore, the cable mobile trolley track bridge shape design must be paid attention to ensure that when the car passes through the place, the bridge will not be derailed phenomenon. The partial discharge test process of cable is usually carried out by hanging Test terminal, if the inspection of the disc cable end position, the direction of improper placement, it is likely to cause the test terminal can not be normal and cable end connection, but to the cable end of the position and direction adjustment, but also need to remove the cable from the shielding room using the driving rotation adjustment cable disk, This is time-consuming and laborious and has a certain security risks. In order to facilitate the reasonable placement of the cable head position and direction in the test process, the cable trolley should be added with the function and device of making the cable disk rotate conveniently along its direction. The cable head of the cable disk can be rotated to a reasonable position required for our test. In order to locate the fault in the cable partial discharge, close to the remote location of the convenience, in the cable car should also be installed in a convenient cable tray in the horizontal direction of the rotary turntable, so that according to our actual test process needs, the cable head can be easily easily rotating to our test the reasonable location needed. To realize the fast connection or exchange of the Test terminal. Sometimes the partial discharge test of large section three-core cable, according to the position and length of the cable head, must be equipped with the cable end test bracket to support the cable head in order to test.


Therefore, the test equipment manufacturers should consider to the test system to prepare a reasonable cable end support test bracket, and the test stand to be designed to be made easy to move, fixed, lifting type for good. The partial discharge test system should be done fine, not only in the anti-interference, reduce the background of the test system itself, but also to the basic facilities required to do fine, to provide customers with a safe, reliable, exquisite, durable partial discharge test equipment.


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