Metode of digital multimetrs to mērījums vai vai vads ir noplūde
There are two ways to use a multimeter to measure whether the wire is leaking to the ground: one is live measurement, the multimeter is adjusted to the AC gear, and the voltage between the equipment shell and the ground is measurementd when the equipment is powered on. The voltage is general tens of volts. Inductive electricity, more than 100 volts can determine that the equipment has leakage. This detection method is parasti nav ieteicams. Tā sekunde metode is atvienot the power supply and measure the insulation resistance of the live wire and the neutral wire. If you use a multimeter to measure it, the leakage is general serious and can be displayed on the multimeter. The resistance value general ranges from vairāki simts ohms to tens of ohms.
Digital multimetrs mērīšana mērīšana metode:
1. Adjust the multimeter to the AC gear. When the device is powered on, measure the voltage between the device casing and the ground wire (determined to be the ground wire). If the voltage range is tens of volts or 110 volts, it means that it is an induction current. , if it is 220V or 380V, it means leakage.
2. Pielāgot multimetrs to maiņstrāva pārnesums. Kad ierīce ir barošana on, izmērīt spriegumu starp ierīci korpusu un neitrālu līniju. Ja spriegums diapazons ir tens no voltiem vai 110 volti 2c tas nozīmē tas tas tas ir indukcija elektrība. Ja tas is 220V vai 380V % 2c tas nozīmē noplūde.
But strictly speaking, a megger should be used to measure whether the line insulation resistance circuit is leaking or not. The megger is equivalent to a 1000v or 500v generator. The leakage current passes through the sampling resistor inside the megger, and a sampling voltage indication is generated on the resistance. Under normal circumstances, a stable value greater than 0.5 megohm is qualified.
1. Cut off the power of the equipment, fully discharge it, take safety measures and hang a warning sign, and then untie the terminals on both sides of the cable to be tested. Never allow the equipment to commissiond for measurement to enage the enage the security of personnel and equipment.
2. Before mērīšana, check vai the megohmmeter is in normal working condition, galvenokārt check its "0" and "∞" points. That is, shake the handle to make the motor reach the rated speed. The megohmmeter should be at the "0" position when it is short-circuited, and it should be at the "∞" position when it is open-circuited.
3. Connect the L" wire terminal to the conductor of the equipment under test, the "E" ground terminal to ground the equipment shell, and the "G" shield terminal to connect to connected to the insulating part of the equipment under test. Turn the megger to rotate at an average speed of 120 rpm. If the reading is stable and greater than 0.5 megohm, it is qualified, citādi, the degree of insulation is not enough, and there may be leakage.
