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 meters, and first through third AND gate. EFFECT: enlarged functional capabilities. 1 cl, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DIFFERENCE-FREQUENCY RELAY | 2002 |
|
RU2208869C1 |
| DIFFERENTIAL-FREQUENCY RELAY | 2002 |
|
RU2222089C1 |
| SYNCHRONIZING RELAY | 2003 |
|
RU2233500C1 |
| RATE-OF-PHASE-ERROR RELAY | 2002 |
|
RU2208282C1 |
| FREQUENCY DIFFERENCE RELAY | 2002 |
|
RU2210131C1 |
| PHASE MISMATCH SPEED RELAY | 2002 |
|
RU2222085C1 |
| FREQUENCY-DIFFERENCE RELAY | 2002 |
|
RU2231851C2 |
| DIFFERENTIAL FREQUENCY RELAY | 2004 |
|
RU2269837C1 |
| FREQUENCY-DIFFERENCE RELAY | 2002 |
|
RU2231157C1 |
| FREQUENCY-DIFFERENCE RELAY | 2002 |
|
RU2225653C1 |
