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Indicator of electrical machines windings defects IDVI-04

IDVI-04 – is a portable instrument designed for monitoring windings of electrical machines.
IDVI-04 – provides the following checks:

  • coils of windings, laid in grooves, for the presence of turn-to-turn short circuits and the quality of turn-to-turn insulation
  • pole coils for interturn short circuits;
  • unsatisfactory condition of the insulation of the windings relative to the machine body and between the windings.

IDVI-04 allows you to identify defects in the windings of an electric machine with a voltage of up to 1000 V (except for windings with equalizing connections). The minimum length of the package of sheets of the checked machine – 45 мм.

Operating principle:

– when checking the state of the turn-to-turn insulation and coil circuits, a pulse EMF is induced in the tested coil. If there are turns in the last short-circuit, a magnetic field pulse from the short-circuit current flowing through them is recorded;
– when checking the pole coils for the presence of turn-to-turn short-circuits, the principle of operation of the indicator is based on a comparison of integral assessments of the quality of voltage pulses on the coils;
– when checking the condition of the insulation of the windings relative to the machine body and between the windings, a direct current voltage is applied to the winding, the insulation resistance is determined and compared with the threshold value (0.5 МОм).

Technical specifications:

1) testing parameters:
– when checking the coils of windings laid in grooves for the presence of turn-to-turn short circuits and the quality of turn-to-turn insulation amperage in the tested coil
– when checking pole coils for interturn short circuits voltage difference coefficient on the coils, K
– when checking the condition of the insulation of the windings relative to the machine body and between the windings insulation resistance, Ri
2) controlled range Kr, % 0÷99
3) controlled range Ri, MOhm 0÷500
4) Kr value when closing one turn in coil, %, not less 10
5) impulse test voltage amplitude:
– when checking the coils of windings laid in the slots, V/turn 1, 2, 4, 8, 16
– when checking pole coils, V 400
6) output DC voltage when measuring Ri, V 1000±100
7) indication LED
8) power supply stand-alone or from an external power supply
9) supply voltage, V 4 (-1.0 +0.2)
10) power consumed, W, no more 4
11) weight, kg, no more 0.5

The warranty period – is 24 months from the date of sale.

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