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The main factors affecting the measurement accuracy of insulation resistance
The main factors affecting the measurement accuracy of insulation resistance, in the actual work of power companies, often need to measure the insulation performance of transformers, high voltage switches, cables and other electrical equipment and devices, so the insulation resistance measurement work is essential In particular, insulation resistance tests must be performed before performing high-voltage tests with a high degree of danger. However, in the actual operation, the power tester will often be affected by other factors. The result of the insulation resistance test is not very satisfactory. Then, what are the reasons that affect the insulation resistance test accuracy?
The first problem is the use of insulation resistance test equipment. If the test equipment is used improperly, there is of course no way to obtain high precision data. Before the test, the instrument should be ready to cut off the equipment power supply and prepare for grounding. Before the test, it is necessary to check whether the instrument can work normally. If the megohmmeter is short-circuited, it should be in the “0†position. When opening the circuit, it should be "∞" position. When testing, the instrument should be placed smoothly and the wiring must be accurate.
Second, the factors affecting the insulation resistance measurement accuracy are the factors of the cable. If the cable is used for a long time, excessive heat or moisture, the insulation resistance will be greatly reduced. Therefore, it is reasonable that the measurement data is inaccurate.
Thirdly, there are measurement time issues that affect the measurement accuracy of the insulation resistance. In actual measurement work, it takes a certain amount of time for the measured electrical current to reach a stable value, which is a peak at the beginning and slow down. Decrease the decay slowly and if the measured electrical resistance is higher, the longer it takes to reach a stable and stable value. Therefore, in order to obtain an accurate resistance value, reading the insulation resistance data is basically performed after one minute of wiring. However, if the capacitance of the device under test is large, or the length of the cable is too long, it is obviously not enough for one minute. Therefore, it is also necessary to seek truth from facts to read the data, and try to wait until the data is stable during reading. Series resonance WWW.HB1000KV.COM.
In the actual operation of measuring the insulation resistance, according to the operating instructions of the insulation resistance tester, according to the actual situation of the tested device, the operation is standardized, and only in this way can we obtain more accurate data.