FIELD: electrical engineering; automatic control of induction motors. SUBSTANCE: newly introduced in relay protective gear are active frequency band filter for discriminating fundamental harmonic of secondary phase currents of induction motor and counter that functions to scale down supply frequency of 50 Hz to 1 Hz; signal arriving from this counter provides for determining permissible operating time in microcontroller from moment of load connection to motor stopping time as function of phase- to-rated current ratio. EFFECT: enhanced precision and efficiency of protective gear under transient conditions. 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DEVICE TO PROTECT THREE-PHASE ASYNCHRONOUS MOTORS | 2009 |
|
RU2415504C2 |
| DEVICE OF THERMAL ENGINE PROTECTION | 2012 |
|
RU2499340C2 |
| DEVICE FOR THERMAL PROTECTION OF ELECTRIC MOTOR | 2012 |
|
RU2498472C1 |
| DEVICE FOR DIAGNOSIS AND QUICKLY PROTECTION OF ASYNCHRONOUS ENGINE | 2017 |
|
RU2679669C1 |
| METHOD FOR ACQUISITION OF DETECTING CRITERION OF SHORT CIRCUIT ON POWER TRANSMISSION LINE IN CASE OF OVERLOAD, OSCILLATION AND ASYNCHRONOUS MODE IN POWER SYSTEM | 2008 |
|
RU2389116C1 |
| INTELLIGENT CONTROL SYSTEM FOR ELECTRIC DRIVE OF PIPE FITTINGS | 2021 |
|
RU2780757C1 |
| INDUCTION MOTOR TURN-TO-TURN FAULT PROTECTION METHOD | 2005 |
|
RU2297704C1 |
| POWER SUPPLY OF ASYNCHRONOUS MOTOR | 2016 |
|
RU2647882C2 |
| DIAGNOSTICS AND PROTECTION CONTROLLER | 2003 |
|
RU2256993C2 |
| LIMITING DEVICE OF LIFTING CAPACITY OF BRIDGE CRANE | 2014 |
|
RU2566459C1 |
