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Protect Equipment And Personal Safety
Jan 12, 2018

Megger also known as shake table or insulation resistance tester (switch tester), is a simple, commonly used high-impedance direct-reading measurement of the instrument can be used to measure the circuit, motor windings, cables, electrical equipment, etc. Insulation resistance. Megohmmeter there are three were marked with the ground (N), the circuit (U), the protective ring (G) of the terminal, when used not only to connect the correct, tighten the button, but also pay attention to the following:

First, the megohm meter before the first measurement of an open circuit and short circuit test, check the megger is normal.

The specific operation is: open the two connecting lines, shaking the handle pointer should mean infinity, and then short the two connecting lines, the pointer should mean at zero Second, the device under test must be disconnected from other power supply, the measurement must be completed The test equipment fully discharged (about 2 to 3 minutes), to protect the equipment and personal safety. The company is located in:

Third, the megohmmeter and the device under test should be used separately between the separate single-wire connection, and keep the line clean and dry surface to avoid errors caused by poor insulation between lines. The company is located in:

Fourth, shaking test, the megger will be placed in a horizontal position, shaking the handle when the button is not allowed to short-circuit between. When measuring the capacitors and cables, the wiring must be disconnected when the crank is rotating, otherwise the reverse charging will damage the megger. The company is located in:

Fifth, shake the handle, should be slow and gradual, uniform acceleration to 120r / min, and pay attention to prevent electric shock. Shaking process, when the pointer has pointed zero, you can not continue to shake, to prevent the table coil heating damage. The company is located in:

Sixth, in order to prevent the measured surface leakage resistance equipment, the use of megger, the middle layer of the device under test (such as the inner shell of the cable between the insulation) connected to the ring. The company is located in:

Seven, depending on the voltage level of the equipment under test Choose a suitable insulation resistance tester. Generally rated voltage below 500 volts of equipment, the choice of 500 volt or 1000 volt megger; rated voltage of 500 volt and above equipment, the choice of 1000 ~ 2500 volt megger. The range of the general use of the selection should be careful not to over-measure the measured value of the insulation resistance of the measured equipment, so as to avoid reading a larger error. The company is located in:

8. It is forbidden to use megohmmeter in lightning weather or in the vicinity of equipment with high voltage conductor.