TETRA, LTD 
IDO-07 – is a portable instrument designed for monitoring windings of electrical machines.
IDO-07 – provides detection of:
- three-phase windings for the presence of turn-to-turn short circuits, phase loss and incorrect connection of the phases;
- coils of windings laid in slots, for the presence of turn-to-turn short circuits;
- insulation states of the windings relative to the machine body and between the windings.
IDO-07 allows you to detect defects in a three-phase winding of a machine with a voltage of up to 1000 V in the assembly, as well as to identify defects in a distributed winding of a stator or rotor of a disassembled machine with a voltage of up to 1000 V (except for windings with equalizing connections).
Operating principle:
– when checking the three-phase winding for the presence of turn-to-turn short circuits, phase loss and the correct connection of the phases, the currents of the two phases of the winding are compared when an alternating voltage up to 10 V is applied to them with a frequency up to 10 kHz. If there are defects, the phase currents will be different;
– when checking the coil of the winding put in the slots for the presence of turn-to-turn short circuits, a pulse EMF of 1V / turn is induced in it. If there are short – circuited turns in the coil, the magnetic induction pulse of the field generated by the short-circuit current flowing through them is registered;
– when checking the insulation state of the windings relative to the machine body and between the windings, a DC voltage is applied to the winding, the insulation resistance is determined and the latter is compared with the threshold value (0.5 MOhm).
Technical specifications:
| 1) | testing parameters: | |
| – when checking the three-phase winding for the presence of turn-to-turn short circuits, phase loss and the correct connection of the phases | asymmetry coefficient of the phase currents, Kn | |
| – when checking the coils of the windings laid in the slots for the presence of turn-to-turn short circuits | current in the checked coil | |
| – when checking the insulation condition of the windings relative to the machine body and between the windings | insulation resistance, Ri | |
| 2) | controlled range Kn, % | 0÷99 |
| 3) | controlled range Ri, MOhm | 0÷500 |
| 4) | Kn value when closing one turn in phase, %, not less | 10 |
| 5) | output DC voltage when measuring Ri, V | 1000±100 |
| 6) | indication | LED |
| 7) | power supply | stand-alone or from an external power supply |
| 8) | supply voltage, V | 5 |
| 9) | power consumed, W, no more | 4 |
| 10) | overall dimensions, mm | 205×805×50 |
| 11) | weight, kg | 0.4 |
The warranty period – is 24 months from the date of sale.