Principle analysis of the hottest DC resistance te

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Analysis of the principle of DC resistance tester

insulation resistance refers to the resistance between two parts of conductors separated by insulating materials, and the insulation resistance tester is an instrument used to measure the insulation resistance. The cost of a plastic bag is generally between 0.08 yuan and 0.13 yuan. In order to ensure the safe operation of electrical equipment, a minimum requirement should be put forward for the insulation resistance between conductors of different polarity (different phases) or between conductors and shell. As an electrical manufacturer, Wuhan Botian Electric Co., Ltd. must conduct insulation resistance test under a certain voltage before leaving the factory, so as to ensure the normal operation of the equipment and the personal safety of the personnel using the equipment

many electrical equipment should also be regularly tested for insulation resistance during use. For example, in the yellow plum season and thunderstorm weather every year, various electrical equipment of various enterprises, especially high-voltage equipment, will be different. 1 Soft and weak: the low degree of moisture or local damage to the tensile strength reduces the insulation resistance of electrical equipment, which directly threatens the safe operation of electrical equipment and the personal safety of workers. In order to prevent accidents, various preventive tests must be carried out on electrical equipment regularly. Another example is the safety requirements of household appliances: the basic insulation is 2mq; The reinforced insulation is 7mq, which is for the normal operation of electrical equipment and the personal safety of workers

therefore, it is particularly important to understand the insulation characteristics of equipment. The factors that affect the measured value of insulation resistance are: temperature, humidity, measured voltage and action time, residual charge in winding and surface condition of insulation, etc. By measuring the insulation resistance of electrical equipment, the following purposes can be achieved:

(1 the company has conducted joint tests with two of the four major German automobile companies) to understand the insulation performance of the insulation structure. A reasonable insulation structure (or insulation system) composed of high-quality insulating materials should have good insulation performance and high insulation resistance

(2) understand the insulation treatment quality of electrical products. Poor insulation treatment of electrical products will significantly reduce their insulation performance

(3) understand the situation of damp and pollution of insulation. When the insulation of electrical equipment is damp and polluted, its insulation resistance usually decreases significantly

(4) check whether the insulation can withstand the withstand voltage test. If the voltage withstand test is carried out when the insulation resistance of electrical equipment is lower than a certain limit, a large test current will be generated, causing thermal breakdown and damaging the insulation of electrical equipment. Therefore, various test standards usually stipulate that the insulation resistance should be measured before the voltage withstand test

it can be seen that the magnitude of insulation resistance can often sensitively reflect the insulation situation, and can effectively find the equipment is generally damp, locally seriously damp and penetrating defects. Therefore, measuring insulation resistance is one of the important means to understand the insulation condition of equipment, and it is an indispensable item in the insulation preventive test

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