Insulated wire and cable for insulation strength test method

Wire and cable insulation strength refers to the insulation structure and insulating materials to withstand the action of the electric field without breakdown damage ability, in order to check the quality of wire and cable products to ensure that the product can be safely operated, all insulation types of wire and cable generally have to carry out insulation strength test. Insulation strength test can be divided into voltage test and breakdown test. Voltage resistance test is under certain conditions on the test piece to apply a certain voltage, after a certain period of time, to whether or not the breakdown occurs as a standard to determine whether the test piece is qualified. Time of the voltage is generally higher than the rated working voltage of the test product, the specific voltage value and withstand time, product standards have provisions, through the withstand voltage test can test the reliability of the product in the operation of the working voltage and found that the insulation in the serious defects, but also found that some of the shortcomings of the production process, such as: the insulation has a serious external damage to the conductor so that the electric field of the serious defects of the drastic aberration; insulation in the production of penetrating Defects or large conductive impurities, etc. Breakdown test is in a certain test conditions, increase the voltage until the test article occurs until the breakdown, measurement of breakdown field strength or breakdown voltage. Through the breakdown test can assess the ability of the cable to withstand the voltage and the safety margin between the operating voltage. Breakdown field strength is one of the important parameters in cable design. Cables in operation generally withstand the AC voltage, but in the DC power transmission system and some special occasions also withstand DC voltage, for high voltage cables may also be subjected to atmospheric voltage (lightning) and operational overvoltage attacks. Therefore, according to the different experimental voltage waveforms, can be divided into 1. AC (industrial frequency) voltage, 2. DC voltage, 3 impact voltage three insulation strength test. Partial discharge measurement for oil-filled cable basically no local power generation; oil paper cable even if there is a partial discharge, usually very weak such as a few PC, so these cables in the factory test can not measure the partial discharge. For extruded plastic cables, not only the possibility of partial discharge, and partial discharge on the plastic, rubber damage is also more serious, with the increase in voltage level, the work of the field strength of the increase, this problem is more serious, so the high-voltage extruded plastic cables, in the factory test should be done in the partial discharge measurement. Partial discharge measurement methods are many, according to the discharge generated by the instantaneous charge exchange, measurement of the discharge pulse (electrical measurement); can also be generated according to the discharge of ultrasound, measurement of its voltage (acoustic measurement); can also be generated according to the discharge of the light, measurement of the intensity of the light (light measurement). For the cable is basically the use of electrical measurement method. Aging and stability test aging test that is in the stress (mechanical, electrical, thermal), whether to maintain stable performance stability test. Heat aging test simple heat aging test is to test the specimen in the role of heat aging characteristics, the specimen is placed in a higher than the rated operating temperature temperature of a certain value of the environment, after a specified period of time, to measure some of the sensitivity before and after the aging of the changes in performance to assess the aging characteristics. Can also be used to increase the temperature to accelerate the aging of the specimen, coupled with moisture, vibration, electric field and other thermal, mechanical, electrical and other stresses to form an aging cycle, after each aging cycle, the determination of some selected sensitive performance parameters. Until the performance declines to the value of the recognized life. So that at a higher temperature T, to get a shorter life L (the time the specimen is heated). Thermal stability test thermal stability test is the cable is heated by the current at the same time also subjected to a certain voltage, after a certain period of heating, the determination of certain sensitive performance parameters to assess the stability of the insulation. Insulation stability test is divided into long-term stability test or short-term accelerated aging test two.

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