Interturn Impulse Withstａnd Voltage Tester

HM201A-5K interturn impulse withstａnd voltage tester

HM201A-5K interturn impulse withstａnd voltage tester adopts "impact waveform comparison method", which alternately applies impulse voltage with specified peak value and wave front time to the DUT and standard parts of the same design. By comparing the difference between the two oscillating waveforms, the insulation between turns of the motor windings can be judged. Various faults such as corona discharge, partial short circuit, wiring error, wire embedding error, coil balance, short circuit between phases, etc. can be judged intuitively.

The interturn impulse withstａnd voltage tester adopts reliable measurement technology and circuit design, and its performance and technical indicators are better than similar domestic products. It can be widely used in the testing of small motors, fractional horsepower motors, micro motors, power tools, transformers, relays and other products.

Pulse peak voltage: 500～5000V (100V step)

Pulse capacitance: 0.01 uF

Front time: 0.5 uS

Test accuracy: <5% (1kV～5kV)

LCD display: Resolution: 320×240; 5.1 inches; white characters on blue background

Power consumption: 40 W

Working power supply: AC220V±10%, 50Hz

Environmental temperature: 0℃～40℃

Relative humidity: ≤85%

Dimensions: 320(W)×170(H)×350(D)

Weight: 7.2kg

a) After unpacking the instrument, check according to the instrument packing list and check whether the accessories are complete.

b) Before operating the instrument, you should first read the instruction manual in detail, or proceed under the guidance of a technician.

Operate in order to avoid unnecessary doubts.

c) The phase line and neutral line of the power input should be the same as the phase line and neutral line marked on the power plug of the instrument.

d) There is high voltage in the instrument, non-professional technicians should not open the case.

e) Before starting the instrument, check whether the case is reliably grounded.

f) This instrument is a high-pressure equipment. Do not place it in a place with high temperature, humidity, excessive dust and corrosiveness.

g) If the high-voltage output line is worn out, renew it in time and have sufficient withstａnd voltage.

h) During the test, when corona discharge, sparking and other abnormal waveforms appear on the waveform display. Don't stay high for a long time

Pressure.

i) When you hear abnormal sounds in the machine, or smell peculiar smells and other abnormal phenomena, you should stop the test.

Professional and technical personnel can only continue after troubleshooting.

IV. Operation steps

a) Check whether the case of the instrument is reliably grounded.

b) Take out the foot switch and insert it into the foot control socket on the rear panel.

c) Plug in the power plug and press the panel power switch to 0N.

d) Press the "Contrast" adjustment key to make the LCD display moderately bright and clear.

e) Press the "Impact Voltage" adjustment key, select the test impulse voltage, and display it in the lower left corner of the LCD

f) Connect the three measuring wires with the DUT according to the test method.

g) Step on the foot switch [or press the "Start" key on the panel], and the start indicator light is on.

h) Press the "X-axis expansion" adjustment key. Choose the ideal waveform.

i) Press the "Amplitude Adjustment" adjustment key. Choose the ideal waveform.

j) Observe the attenuated oscillation waveform on the waveform display, and perform fault analysis and judgment (see Test Judgement and

Fault identification).

k) Loosen the foot switch [or press the “stop" key on the panel] to remove the DUT.

l) To continue the test, please repeat steps f~k.

m) End the test.

1 Test preparation

Check for coincidence of waveforms. Connect the two sets of test wires of the instrument to the same winding respectively. If the instrument works normally, the two sets will fail

The damping waveforms should completely overlap.

2. Test method

【1】 Φ (phase) connection

This method is the most basic method for judging the insulation fault between turns, and it is suitable for testing that there are lead wires at both ends of each phase.

Winding. During the test, the user can choose one phase winding (such as U phase) as the reference part, and the other phase winding (such as

V phase) as the test piece, apply the specified peak high voltage shock pulse on the U phase and V phase at the same time, and compare the two attenuations

Similarities and differences of oscillation waveforms. Then switch one by one, and repeat the test once. As shown below.

Φ (Phase) connection

[2] Y (line) connection

This method is suitable for testing windings that have formed Y-connection or high-power coil windings. User is testing

When, you can choose one set of two-phase series winding (such as U-W phase) as the reference part, and the other set of two-phase series winding (such as

V-W phase) as a test piece, apply a high-voltage shock pulse with a specified peak value to both U-W phase and V-W phase at the same time, compared with

Compare the similarities and differences of the two attenuated oscillation waveforms. Then switch one by one, and repeat the test once. As shown below.

Y(Line) connection

[3]Δ (angle) connection

This method is suitable for testing windings that have formed a delta connection. When testing, users can choose a set of two-phase strings

The combined winding is connected in parallel with the third phase winding (such as U-W phase) as the reference part, and the other two-phase series winding is connected with the third phase

Parallel windings (such as V-U phase) are used as the test piece, and the specified peak high voltage is applied to the U-W phase and V-U phase at the same time

Shock pulse, compare the similarities and differences between the two attenuated oscillation waveforms. Then switch one by one, and repeat the test once. As shown in the picture below

Show.

Δ (Corner) connection

3. Single-phase coil or winding test

For single-phase coils with two identical windings, a test method similar to three-phase windings can be used for testing.

The windings of the same specification can also be used for comparative testing. When testing, the user can choose one and the specifications of the tested part

The same as the parameters, and the windings with intact inter-turn, inter-winding and ground insulation are used as reference parts.

Simultaneously apply a high-voltage shock pulse with a specified peak value to the parts, and compare the similarities and differences between the two attenuated oscillation waveforms.

When using a single set of coils for withstａnd voltage test, in order to accurately display and observe the peak voltage, it is recommended

Short-circuit the two high-voltage test terminals before testing.