DEVICE FOR TESTING SERVICEABILITY OF RELAY PROTECTION UNIT Russian patent published in 1994 - IPC

FIELD: electric engineering. SUBSTANCE: device permits to determine priority of relay operation accompanied with subsequent indication. Device has tape recorder for applying control signals to input of relay protection unit in the mode of testing relay protection serviceability. Digital memory unit is connected to the output of relay protection unit. Code of relay protection unit channel number is recorded, which received turn signal after being processed in input pulse former and encoder. Address counter automatically increments address of digital memory unit after each sequent signal is received. Cells of digital memory unit, beginning from the first cell, are filled with numbers of relay protection channels, which were used for passing signals. Sequence of reception of signals or priority of relay operation, which send the signal for one of the channels when turning-o or turning-off relays, may be restored by using indication unit after reviewing contents of cells of digital memory unit. EFFECT: improved truth of control; improved capability of analyzing development of some process, for example, troubles in factories. 1 dwg