FIELD: electrical engineering; checking commercial frequency for deviation from rated value. SUBSTANCE: relay that functions as overfrequency and underfrequency relay at a time has isolating transformer, frequency filter, frequency-dependent component, three comparators, two pulse shapers, AND gate, pulse counter, nonrecursive filter, final element, delay circuit, and clock generator. EFFECT: enlarged functional capabilities. 1 cl, 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| FREQUENCY RELAY | 2002 |
|
RU2220472C1 |
| RESISTANCE RELAY | 2002 |
|
RU2224322C1 |
| DIFFERENTIAL RELAY | 2002 |
|
RU2223569C1 |
| DIFFERENTIAL-PHASE RELAY | 2002 |
|
RU2231156C1 |
| FREQUENCY RELAY | 2002 |
|
RU2208864C1 |
| PHASE-FREQUENCY RELAY | 2002 |
|
RU2210132C1 |
| FREQUENCY RELAY | 2002 |
|
RU2208865C1 |
| STATIC POWER RELAY | 2002 |
|
RU2216813C1 |
| RESISTANCE RELAY | 2002 |
|
RU2227942C1 |
| DIFFERENTIAL RELAY | 2002 |
|
RU2208258C1 |
