FIELD: electricity.
SUBSTANCE: at earth fault protection of an electrical machine such as generator input signal with frequency fi is delivered to the electrical machine in order to generate periodic bias voltage at a busbar of the electrical machine. The response signal is assessed in order to identify closure. Frequency of the input signal is adapted, i.e. regulated or selected depending on a system parameter or system attribute of the electrical machine specific for the system noise interacting with the response signal and overlapping it. Thus selection of non-variable preset frequency of the introduced signal is rejected in favour of a flexible approach corresponding to the very last value of the electric machine parameter.
EFFECT: improving stability and reliability of the protection system.
12 cl, 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DEVICE AND METHOD FOR DETECTION OF GROUND SHORT-CIRCUIT | 2010 |
|
RU2542494C2 |
| METHOD FOR DETECTION OF LEAKAGE OR FAULT CURRENTS FROM EQUIPMENT IN ELECTRICAL POWER SYSTEM | 2011 |
|
RU2581773C2 |
| METHOD AND DEVICE FOR IMPROVEMENT OF DETECTION RELIABILITY OF GENERATOR GROUND FAULT AT ROTATING ELECTRICAL MACHINE | 2011 |
|
RU2539098C1 |
| METHOD AND DEVICE FOR DETECTING SHORT-CIRCUIT GROUND AND CALCULATING ITS RESISTANCE | 2001 |
|
RU2263925C2 |
| METHOD AND DEVICE FOR CONFIGURING SHORT-CIRCUIT PROTECTION SYSTEM IN THREE-PHASE ELECTRICAL NETWORK | 2013 |
|
RU2529490C1 |
| DEVICE FOR PROTECTING A.C. GENERATOR | 0 |
|
SU1107211A1 |
| METHOD AND DEVICE FOR MONITORING STATE OF AEROPLANE STRUCTURE | 2006 |
|
RU2385456C2 |
| METHOD AND DEVICE FOR AUTOMATIC CHECKUP OF NEUTRAL WIRE PARAMETERS IN 0.4-KV OVERHEAD OR CABLE LINES | 2005 |
|
RU2295186C1 |
| COMPLEX OF AUTOMATIZATION MEANS OF GAS-PISTON ELECTRIC PLANT | 2001 |
|
RU2218587C2 |
| METHOD FOR LOCATING SINGLE-PHASE GROUND FAULT IN POWER DISTRIBUTION NETWORK | 1996 |
|
RU2159445C2 |
