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Instruments for measuring insulation resistance

time:2020/10/23   source:华天电力  reading:234 time

Due to its extended measurement capabilities, modern household megohmmeters not only have high noise immunity, they can also check insulation resistance, as well as surge suppressors and lightning arresters, such as lightning arresters and lightning arresters widely used on railways. In other words, the megohmmeter combines a variety of equipment, so that they can be successfully used in the oil and gas industry, communications and energy applications.


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Insulation is one of the most important types of protection, and its parameters have a decisive influence on the safety of operation and the normal operation of electrical equipment. In order to determine the actual state of insulation of electrical equipment, the insulation resistance must be measured. If resistance measurements are made on a regular basis, an early deterioration of the insulation condition and a corresponding reduction in the protection level may be found. The main factors that negatively affect the insulation state are electrical, mechanical, chemical, thermal and climatic influences. Under normal operating conditions of electrical installations, all the above factors will have a significant impact on the aging of the insulation.


To ensure protection against electric shock, the condition of insulating materials must be monitored. For this reason, insulation resistance measurement is also performed. The insulation resistance measurement is based on the measurement of the current in the circuit when the test voltage is applied. The megohmmeter insulation resistance meter (megohm insulation meter) can generate test voltages up to 2.5 kV, which is particularly important for testing the insulation of cables, current and voltage transformers, motors and other electrical and telecommunications facilities.


Meggers are compact portable devices that can perform a comprehensive diagnosis of insulation because they can not only measure the resistance of dielectric materials, but also identify negative processes that occur in them due to exposure to moisture and other factors. In the process of measuring the insulation resistance, the megohmmeter will display the magnitude of the leakage current and measure the capacitance of the cable.


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