| 摘要 |
<p>The appliance is intended for testing the protection relays (10, 20, 30) of an electrical installation without interrupting its operation. Each of the relays comprises at least one coil (11, 12) controlling contacts (13, 14, 15), some of which (13, 14) are connected to a user circuit (ut10) consisting mainly of a circuit- breaker and/or a signalling system. It is characterised in that it comprises an injection circuit (100) incorporating means for producing currents with calibrated values and voltages of given values. Each of the tested relays is associated with one injection box (60, 70, 80) which contains a locking relay consisting of a coil (65) and contacts (66, 67) in series with the user circuit of the corresponding relay and an injection relay consisting of a coil (61) actuating contacts (62, 63, 64, 65) making it possible to route and inject a calibrated test current or test voltage supplied by the injection circuit to one or other of the coils of the tested relay. The coils (61, 65) of the injection and locking relays are supplied through a sequence- controlling circuit (120) containing a logic controller programmed to set up a predetermined sequence of tests. One (15) of the contacts of the tested relay is introduced into an indicator circuit showing whether the said relay is functioning or not. Application to the checking of protective relays for electrical installations. <IMAGE></p> |
