Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1986-12-22
1988-12-06
Pellinen, A. D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
324158MG, 324423, 324424, G01R 3102
Patent
active
047898348
ABSTRACT:
A method and apparatus for testing the operability of an overload protection device for an induction motor, rapidly and without the need to mechanically load the motor output shaft. A rectifier circuit converts a standard AC input power signal to an unfiltered full wave rectified output power signal which is applied to the input terminals of the motor under test to rapidly heat the overload device to its trip temperature. The output power signal is periodically interrupted for brief periods of sufficient duration to extinguish any arcing occasioned by the opening of the overload device contacts. The period between successive interrupt periods is selected to be short enough to extinguish any such arcing before the contacts are damaged. If the contacts of the protection device fail to open within a predetermined time period, a signal is generated to indicate that the overload device has failed to operate properly.
REFERENCES:
patent: 2541121 (1951-02-01), Sparklin
patent: 3924160 (1975-12-01), Maier et al.
patent: 4258325 (1981-03-01), Richardson
patent: 4340853 (1982-07-01), Braun et al.
patent: 4463571 (1984-08-01), Wiggs
patent: 4692939 (1987-09-01), Parsons
General Electric Company
Ginsburg Morris
Houser H. Neil
Pellinen A. D.
Reams Radford M.
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