How to use the electrician's megger:
Connect the E terminal of the megger to ground reliably and connect the L terminal to the line under test. Shake the oscillating watch generator handle clockwise from slow to fast for about 1 minute. Wait for the oscillating watch hand to stabilize and take a reading. At this time, the value indicated by the megohmmeter is the insulation resistance value of the tested line to ground, and the unit is megohms.
Megger meters used by electricians commonly come in three types: 500V, 1000V, and 2500V, depending on the voltage they measure. Without special timing, if the operating voltage of the equipment is 500 V or less, use a 500 V megger to measure it. If you choose a high voltage megger, it may damage the insulation of the equipment under test if the voltageoperating performance is higher. 500 V and below 3000 V, use a 1000 V megger. For meter measurements, use a 2500 V megger for measurements at 3000 V and above.
Precautions for use
1. When measuring the insulation resistance of the equipment, the power supply to the equipment should first be turned off. Equipment containing inductors and capacitors (such as capacitors, transformers, motors and cable lines) should be discharged first. Off-duty personnel must request corresponding work tickets before they can work.
2. The oscillator must be placed horizontally. Before wiring, you need to shake the oscillator and observe whether the pointer is on ∞. Then short-circuit terminals L and E and slowly shake the watch. The needle should be at zero. After open circuit and short circuit tests, it isconfirmed that the megger is intact before the measurement can be made.
3. The lead wire of the megger should be a multi-stranded soft wire and the two wires should not be twisted together to avoid inaccurate measurement data.
4. After the megger measurement is completed, the measured object should be unloaded immediately. Do not touch the measuring part of the measured object or disassemble it with your hands until the megger stops rotating and the measurement is completed. the object is not discharged to avoid electric shock.
5. The surface of the object to be measured should be wiped clean and there should be no dirt (such as paint, etc.) to avoid inaccurate measurement data.
How to use and pay attention to the multimeter?
Purpose: In order to avoid accidents, it is used to measure the insulation of Various electrical equipment Megger for resistance,megger is convenient and reliable for measuring insulation resistance.
Instructions for use:
1. Before measurement, the power supply to the electrical apparatus and circuit under test should be cut off, and the relevant components should be temporarily grounded and discharged. ensure the safety of people and the megger and the measurement results are accurate.
2. The wiring must be correct when measuring. The megger has three terminals (L, E, G). When measuring the resistance of the loop to ground, the L end is connected to the exposed conductor of the loop and the E end is connected to the ground wire or metal shell when measuring the resistance d 'loop isolation, the first and; the last ends of the loop are connected to L and E respectively; cable insulation is measured when measuring resistance, to prevent leakage current on the cable surface from affecting the pFor the measurement, the shielding layer of the cable must be connected to terminal G.
3. The wire insulation of the Megger terminal test lead must be in good condition and a suitable distance must be maintained between the two wires and between the wires and the ground to avoid affecting the measurement accuracy.
4. When shaking the megger, do not touch the megger terminals and the circuit under test with your hands to avoid electric shock.
5. After shaking the megger, do not short the terminals to avoid damage.
6. Don't shake the megger for too long.
Detailed information:
Remarks
1. It is prohibited to measure insulation resistance during lightning or near high voltage equipment. It can only be measured when the equipment. is not charged and there is no measurement ofinduced current.
2. During the shake test, no one may work on the equipment under test.
3. When measuring the insulation resistance of the equipment, the power supply to the equipment should first be turned off. Equipment containing inductors and capacitors (such as capacitors, transformers, motors and cable lines) should be discharged first. Off-duty personnel must request corresponding work tickets before they can work.
4. The oscillator must be placed horizontally. Before wiring, you need to shake the oscillator and observe whether the pointer is at "∞". Then short-circuit terminals L and E and slowly shake the watch. The needle should be at zero. After open circuit and short circuit tests, the megger is confirmed to be intact before measurement can be made.
5. The megger wire should be a flexible multib wirerins, and the two wires should not be twisted together to avoid inaccurate measurement data.
References:
The function and use of the Shake Meter for electrician
The Shake Meter is also It is called megger and its purpose is to test the insulation condition of circuits or electrical equipment. The method of use and precautions are as follows: (1) First, select a megometer suitable for the voltage level of the component under test. For electrical lines or equipment rated 500V and below, a 500V or 1000V megometer should be used. For electrical lines or equipment above 500 V, a 1000 V or 2500 V megger should be used. (2) When testing the insulation of high voltage equipment with a megger, two people should do it.(3) Before measurement, the power supply of the circuit or electrical equipment under test should be completely disconnected, that is, it is not allowed to measure the insulation resistance when the device is powered on. And make sure no one is working on the wiring or electrical equipment before continuing. (4) The meter wire used by the megger shall be an insulated wire, and a double-stranded insulated wire shall not be used. The end of the meter wire must have an insulating sheath; connected to the device under mutual test., the ground terminal “E” should be connected to the shell of the equipment and the unmetered phase of the equipment, and the shield terminal “G” should be connected to the protection ring or cable insulation sheath to reduce measurement error caused by leakage. current on the insulating surface. (5) The megger should be checked for open circuits before measurement.When the “L” end and “E” end of the megger are discharged, the shaker pointer should point to “∞” when the “L” end and “E” end of the megger are short-circuited. is shaken, the pointer should point to "0". This indicates that the megger is working well and can be used. (6) The electrical circuit or equipment under test must be grounded and discharged before testing. When testing a line, you must obtain permission from the other party before continuing. (7) When measuring, the shaking speed of the rocker handle should be uniformly 120 rpm; After maintaining a stable speed for 1 minute, take the reading to avoid the influence of current draw. (8) During the test, both hands are not allowed to touch both wires at the same time. (9) After the test is completed, the stitches should be removed first, and then stop shaking the monbe. This helps prevent electrical equipment from charging the megger and damaging it. (10) During a lightning strike, it is strictly forbidden to test the insulation of the line.
Notes: 1.
1. When using a multimeter, you should first pay attention to the gears and distinguish between resistance gears, AC or DC gears, voltage or current gears, etc. .
2. After determining the gear, if you have no idea of the size of the measured object, test it from the highest gear first
3. After use, adjust the gear. to the highest AC voltage equipment.
2.
1. Before using the megometer, ensure that there is no voltage on the component under test
2. circuit and open circuit before use. Make sure the instrument is easy to use
3. After measurement, completely discharge the tested component
3. 1. When vou use the clamp meter, set it to the highest setting. Reduce the voltage gradually to prevent high current from damaging the multimeter.
2. It is best to wear insulated gloves when measuring and insulated boots when measuring. high voltage.
The function of an electrician's megger is to use To test the resistance of the line or equipment, or the resistance of the line to ground, or the resistance of equipment to ground, the method of using the megger is to first short-circuit the megger lead and gently shake it for half a turn, and the meter needle should return to zero. Next comes the standard open circuit of the megger. Your speedometer indicator should be at 120 rpm. pointing to infinity