It is measured with a definite target(Part 2)

17. Technique of measuring three-phase three-wire current with a clamp ammeter

Three - phase three - wire current is measured by a clamp ammeter.Kirchhoff a certain rate is obtained by measuring a technique.The clamp mouth is connected with a wire to read the current value of the phase.

Put two wires into the clamp mouth to read the third phase current.Three lines are put into the jaws of the pliers, and the load balance reading is zero.

18. Clamp ammeter measuring ac small current skill

Use clamp ammeter to measure low ac current.Insulated wire for the load under test, with coils around the clamp core.The reading divided by turns plus one gives the true current.

19. Detect the phase-breaking fault of three-phase resistance furnace connected with star

Three - phase resistance furnace phase break, clamp - shaped ammeter detection.The current value of the two phase lines is less than the rated current.When a phase wire has zero current, the phase resistance wire is burnt.

20. Find out the fault point of short-circuit grounding of low-voltage distribution line

Low voltage distribution line is long, short circuit connection is difficult to check.Fault phase line series furnace, single control switch to power supply.The clamp ammeter is used to measure the current segment by segment.

If there is no current boundary, it is the short circuit connection point.

21. Test the thyristor rectifier device

Thyristor rectifier, clamp ammeter test.Clamp sleeve anode connection line, watch the current number of meter head.The meter head indicates zero current and the element under test is not working.

Three - phase element current value, basic balance is normal.Severe current imbalance, component phase shift inconsistent.Ac part is faulty and rectifier transformer is out of phase.

22. Test and judge that users steal electricity across phase

Users single - phase electricity meters, metering less or do not go.Front or back of the meter, clamp ammeter detection.The clamp sleeve phase line is neutral, and the indicator is not zero.

The current reading varies greatly in the neutral line.Then determine the theft of electricity across phase, one phase one ground type.

23. Safety procedures to be when measuring insulation using an insulation resistance meter

Use insulated resistance meters in accordance with safety regulations.When measuring the high voltage equipment, it must be done by two people.The equipment under test is completely cut off and fully discharged.

24. Use insulation resistance meters correctly

Use insulated resistance meters with appropriate voltage levels.Before the test, the equipment is completely cut off and fully discharged.The equipment under test is cleaned and the surface is clean without dirt.

Guard against the appropriate table location, away from the electric and magnetic fields.Horizontal placement without tilt, open circuit short circuit two tests.Two - color single - core soft lead, non - wound insulation.

The terminal button is clearly identified and the wiring is tested to be correct.As the crank moves clockwise, the speed gradually becomes constant.There is no fixed number of rolling measurement time, steady pointer reading.

25. Matters needing attention when using insulation resistance meter for testing

Insulation resistance meter test, eight points to remember.Never touch the wiring knob during the test.Table head glass dust, shake test process can not be wiped.

The test equipment is insulated to the ground, and the ground end is buttoned to the housing.Large shaking capacity measuring equipment, detached at rated speed.Check the electrolytic capacitor, and connect the earthing end button to the positive electrode.

Test with the same equipment, it is best to use the same table.When the equipment is insulated, write down the temperature when measuring.It is not suitable to be used as a meter because of thousands of ohms resistance.

26. Series diodes prevent the device under test from discharging on the insulation resistance meter

Insulated resistance meter end knob, series crystal diode.Large shaking capacity measuring equipment, prevent the equipment discharge current.Eliminate left and right hand swings to ensure accurate reading.

Stop rolling after measurement and the meter will not be damaged.

27. Methods to increase the voltage of insulation resistance meter

Low voltage insulation resistance meter, connected in series to measure insulation.Series voltage level stack, insulation resistance reading and.

28. Insulation absorption ratio of power transformer

Transformer insulation pros and cons, insulation resistance meter test.At room temperature of about 20 degrees, starting from the time of measurement: reading at 15 seconds, the passage of seconds stable value.

The ratio of two insulation resistance is called insulation absorption ratio.Greater than 1.3 good, less than 1.3 damp.

29. Quickly test and judge the quality of the low-voltage motor

Open the junction box to check the quality of the low-voltage motor.Insulation resistance meter, minimum insulation megoohm value, 35 degree reference 8, 10 degrees per liter divided by 2.

Double every ten degrees, and read more than that.Multimeter dial milliamperes, motor star connection method.The watch pen is connected to the two phase head, the hand disc rotating shaft turns slowly.

The hands of the watch were clearly left and right, and the results of the three tests were the same.The motor under test is good, otherwise the motor cannot be used.

30. Insulation resistance meter measures the quality of hV silicon reactor

High voltage silicon reactor, insulation resistance meter test.The line is grounded by two leads, touching two extremes of the silicon stack.The difference of resistance value is very good.

The two reads are very close. The reactor under test has failed.Two readings are infinite. The silicon reactor is open.Two readings close to zero, a breakdown in the silicon reactor short circuit.

31. The insulation resistance meter measures the quality of the ballast high pressure mercury lamp

High pressure mercury lamp stand or fall, kilovolt insulation resistance meter.The connection is grounded to two leads connected to both ends of the lamp cap.The mercury lamp was kept in a dark place and moved slowly and gradually.

The reading is less than half megohm, the halo emitted from the bubble is good.No light reading, mercury lamp short circuit inside.The needle indicates infinity and the lamp has an open circuit fault.

32. The insulation resistance meter detects the quality of the daylight lamp tube

Measuring the mass of daylight lamp, kv insulation resistance meter.Multimeter dial voltage block, measuring range DC 500 volts.The multimeter is in parallel, with the same polarity and voltage.

The line grounding two leads, jumper lamp tube ends foot.Light at rated speed, less than 300 volts normal.The lamp is a little shiny, more than 300 volts old.

The lamp does not shine all the time, indicating that the lamp has been damaged.

33. Insulation resistance meter measures the quality of fluorescent lamp starter

Fluorescent lamp starter, insulation resistance meter test.The line is grounded to two leads, connecting the two poles of the starter.Neon bubbles flash red light while gently rocking the handle.

The starter is in good condition, or the starter is damaged.

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