Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-02-26
1977-08-02
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
340410, G01R 3102
Patent
active
040399320
ABSTRACT:
Apparatus provides for testing a fault indicator of the type which has a surge-current detection portion and a settable fault indicating portion and which is widely used in electric power distribution systems. Such a fault indicator must meet certain performance specifications including a maximum allowable reaction-time specification relating to the time required for the detection portion first to detect a surge current flowing in a conductor as a result of a down-line fault and then to set the fault indicating portion accordingly. The testing apparatus of this invention provides for effectively simulating field conditions, and to this end includes current-drive circuitry for supplying a test surge current to the fault indicator under test. Substantially simultaneously with the start of the test surge current, a timing-initiation signal is produced to enable interval-timing circuitry in the testing apparatus. To designate the end of the interval being timed, there is produced a timing-completion signal. Preferably, an optical sensing arrangement responsive to the fault indicator provides the timing-completion signal. The testing apparatus includes a display responsive to the interval-timing circuitry to show test result data as to the reaction time of the fault indicator under test.
REFERENCES:
patent: 3321702 (1967-05-01), Tuccinardi
patent: 3373350 (1968-03-01), Reece
patent: 3495174 (1970-02-01), Marek
Rolinec Rudolph V.
San Diego Gas & Electric Co.
Tokar Michael J.
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