Insulation deterioration monitoring apparatus

Details Insulation deterioration monitoring apparatus Insulation deterioration monitoring apparatus

1985-12-09

1988-04-12

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

324547, 340646, G08B 2100

Patent

active

047377755

ABSTRACT:
The apparatus for monitoring an insulation deterioration of an insulation layer surrounding an outer surface of a coil conductor comprises a semiconductor layer of 10.sup.2 to 10.sup.7 ohm-cm formed within the insulation layer of the coil, an electric field sensor such as Pockels element or ferroelectric element mounted on the coil insulation layer. The semiconductor layer is so formed as to divide the insulation layer into inner and outer layers. When the inner layer deteriorates, a high electric field is sensed, while the outer layer deteriorates, a low electric field is sensed. Therefore, it is possible to discriminate the insulation deterioration positions on the basis of the change in electric field detected by the sensor element. In case of deterioration, alarms are produced or the power supply of machine is turned off for safety.

REFERENCES:
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patent: 3983477 (1976-09-01), Stuchley et al.
patent: 4398187 (1983-08-01), Fukushima et al.
patent: 4410851 (1983-10-01), Goffaux
Austrian Journal, Elektronik und Maschinenbau, vol. 97, No. 7, Jul. 1980, pp. 275-279.

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