Siemens – 7XT71

Bandpass filter 20 Hz in case 7XP20.

CONTROLLING DEVICE FOR ROTOR-EARTH-FAULT PROTECT. 0.5 TO 4HZ IN 7XP20, PANEL FLUSH MOUNTING

20 HZ FREQUENCY GENERATOR FOR EARTH FAULT 100% PROTECTION THE 20HZ FREQUENCY GENERATOR CREATES A 20HZ SQUARE WAVE VOLTAGE WITH AN AMPLITUDE OF APPROX. 25V. THIS VOLTAGE IS CONNECTED VIA BANDPASS AND A LOAD RESISTOR TO THE STATOR CIRCUIT OF THE GENERATOR. THE FREQUENCY GENERATOR IS CONNECT. (THREE PHASE) TO THE VOLTAGE TRANSFORMER. ALTERNATIVELY A POWER SUPPLY VIA THE STATION BATTERY(100,220V DC) IS POSSIB. MAX. POWER CONSUMPT.APPROX.80VA MEASUREMENT VALUE PROCESSING WILL DONE BY 7UM515 IN 7XP20 CASE FOR

20 HZ FREQUENCY GENERATOR FOR EARTH FAULT 100% PROTECTION THE 20HZ FREQUENCY GENERATOR CREATES A 20HZ SQUARE WAVE VOLTAGE WITH AN AMPLITUDE OF APPROX. 25V. THIS VOLTAGE IS CONNECTED VIA BANDPASS AND A LOAD RESISTOR TO THE STATOR CIRCUIT OF THE GENERATOR. THE FREQUENCY GENERATOR IS CONNECT. (THREE PHASE) TO THE VOLTAGE TRANSFORMER. ALTERNATIVELY A POWER SUPPLY VIA THE STATION BATTERY(100,220V DC) IS POSSIB. MAX. POWER CONSUMPT.APPROX.80VA MEASUREMENT VALUE PROCESSING WILL DONE BY 7UM515 IN 7XP20 CASE FOR

20 HZ BANDPASS FOR STATOR EARTH FAULT 100% PROTECTION THE 20HZ BANDPASS FILTERS THE SQUARE-WAVE VOLTAGE AND TRANS- FORMS IT TO SINUS CURVES WITH FREQUENCIES OF APPROX. 20HZ. THE INTERNAL RESISTANCE IS THEN EQUAL TO APPROX. 8 OHM. AT THE SAME TIME IT PROJECTS THE 20HZ FREQUENCY GENERATOR IN CASE OF EARTH FAULT WITH FULL DISPLACE- MENT VOLTAGE. AT RATED FREQ. THE RESISTANCE IS APPROX. 160 OHM (50HZ), 200 OHM (60HZ). MAX. POWER CONSUMPTION IS APPROX. 80VA. IN 7XP20 CASE FOR FLUSH MOUNTING

20 HZ BANDPASS FOR STATOR EARTH FAULT 100% PROTECTION THE 20HZ BANDPASS FILTERS THE SQUARE-WAVE VOLTAGE AND TRANS- FORMS IT TO SINUS CURVES WITH FREQUENCIES OF APPROX. 20HZ. THE INTERNAL RESISTANCE IS THEN EQUAL TO APPROX. 8 OHM. AT THE SAME TIME IT PROJECTS THE 20HZ FREQUENCY GENERATOR IN CASE OF EARTH FAULT WITH FULL DISPLACE- MENT VOLTAGE. AT RATED FREQ. THE RESISTANCE IS APPROX. 160 OHM (50HZ), 200 OHM (60HZ). MAX. POWER CONSUMPTION IS APPROX. 80VA. IN 7XP20 CASE FOR SURFACE MOUNTING

20 Hz generator in case 7XP20.