Electricity: measuring and testing – Electromechanical switching device – Relay
Patent
1978-12-04
1979-12-04
Corcoran, Robert J.
Electricity: measuring and testing
Electromechanical switching device
Relay
324 73AT, G01R 3102
Patent
active
041774191
ABSTRACT:
A test apparatus for checking test objects, such as protective relays, especially voltage, current and/or frequency relays for the protection of a generator of a power supply network, comprising a first circuit for generating and converting test signals or magnitudes to be delivered to the test objects and a second circuit for pre-programming the test signals or magnitudes to be delivered to the test objects. The first circuit comprises a first test signal generating circuit for supplying the voltage relay and the current relay with voltage and current test signals, respectively, and contains a first secondary winding of a test transformer. A static potentiometer is connected in parallel with this first secondary winding. The potentiometer supplies test signals in finely stepped or graduated values to the test objects. The first circuit further comprises a second test signal generating circuit for supplying the frequency relay with frequency test magnitudes. The second circuit embodies a test matrix composed of intersecting electrically conductive rails. The test matrix stores information concerning the test signals to be delivered to the relays. A signal and control device operatively connected with the test matrix and receiving therefrom the stored information concerning the test signals stores a predetermined course of the test program and correspondingly controls the performance of the test.
REFERENCES:
patent: 3678372 (1972-07-01), Elder
Austin, F. W.; Improved Portable Relay Test Set; Trans. & Distributions, vol. 26; No. 9; pp. 42-43; Sep. 1974.
Gore, W. M.; Relay Testing; Electrical Review; Feb. 22, 1946; pp. 293-295.
BBC Brown Boveri & Company Ltd.
Corcoran Robert J.
Kleeman Werner W.
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