Fault indicator tester with test bar and test chamber

摘要

A testing apparatus for testing a sample fault indicator (11) of the type which has a current sensor (15), an automatic reset, an inrush restraint feature, and an indicator display (13) that are widely used by electric utilities for fault location of overhead and underground distribution power circuits. The first objective of the testing apparatus is to test the predetermined current threshold level of the sample fault indicator (11) which is specified by the producer. It provides for the simulation of a fault current condition by means of a pulse driver circuit (99). The output response of properly working fault indicator (11) under this test will cause the indicator display (13) to register a fault state. The second object provided by this apparatus is to test the automatic resetting of the sample fault indicator (11). It provides for simulating a reset signal (105) for a controlled duration of time. A further objective is to test the inrush restraint feature by providing an inrush current simulation, a problem associated with reclosures on power circuits. Testing for inrush restrain shall verify that the sample fault indicator (11) can distinguish between fault currents and inrush currents, thereby preventing a false indication. The apparatus has a test bar (25) means of holding the sample fault indicator within a testing chamber (23) that is under test.