DEVICE FOR DETECTING WIRE CIRCUITS IN ELECTRIC MACHINES AND INDUCTION COILS Russian patent published in 2018 - IPC G01R31/06 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring equipment. Essence: the device contains a pulse generator, loaded on a parallel chain from the capacitor and the inspected winding. Test winding consists of two windings connected in series, one of which may be exemplary, or the winding consists of two identical parts of the armature winding. Device also contains a subtracter and an adder with inputs connected to the outputs of the windings and clocked from the generator output through the delay element and the pulse generator of the clock pulse. Output of the adder is connected to the input of the phase-sensitive rectifier. Output of the subtracter through the control pulse driver is connected to the control input of the phase-sensitive rectifier and through the second rectifier, the second low-pass filter and the second one-threshold comparator to the second input of the logic element. Output of one of the windings through the first rectifier, the first low-pass filter and the first one-threshold comparator is connected to the first input of the logic unit. Third and fourth inputs of the logic unit are fed with a signal from the phase-sensitive rectifier output through the third low-pass filter and the two-threshold comparator. Three outputs of the logic block are connected to three indicators – the indicator of the circuit, the indicator of the first checked winding, the indicator of the second inspected winding.

EFFECT: increase of reliability and accuracy of detecting the fault currents in the coils of inductances.

3 cl, 7 dwg