FIELD: electrical engineering; protective gear for supply mains and generators. SUBSTANCE: difference-frequency relay has input voltage rectifier, synchronized voltage rectifier, first and second algebraic adders, first and second multipliers, first and second inverters, first through fourth comparators, first and second final elements, input- voltage frequency meter, synchronized-voltage frequency meter, first through fifth AND gates, first and second short-pulse shapers. EFFECT: enlarged functional capabilities; enhanced noise immunity. 1 cl, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DIFFERENCE-FREQUENCY RELAY | 2002 |
|
RU2208868C1 |
| DIFFERENTIAL-FREQUENCY RELAY | 2002 |
|
RU2222089C1 |
| RATE-OF-PHASE-ERROR RELAY | 2002 |
|
RU2208282C1 |
| FREQUENCY DIFFERENCE RELAY | 2002 |
|
RU2210131C1 |
| PHASE MISMATCH SPEED RELAY | 2002 |
|
RU2222085C1 |
| SYNCHRONIZING RELAY | 2003 |
|
RU2233500C1 |
| PHASE-TO-GROUND FAULT PROTECTIVE GEAR | 2002 |
|
RU2214643C1 |
| DIFFERENTIAL-FREQUENCY RELAY | 2002 |
|
RU2222086C1 |
| RESISTANCE RELAY | 2002 |
|
RU2224322C1 |
| FREQUENCY-DIFFERENCE RELAY | 2003 |
|
RU2231849C1 |
