APPLICATION NOTES
APPENDIX B
B-2
Once again, if the polarity of one of the phases is out by 180
°
, the magnitude of the resulting vector on a balanced system will be out by
a factor of 1.73.
On a three wire supply, this configuration will always work and unbalance will be detected properly. In the event of a single phase, there
will always be a large unbalance present at the interposing CTs of the relay. If for example phase 'A' was lost, phase 'A' would read zero
while phases 'B' and 'C' would both read the magnitude of phase 'C'. If on the other hand, phase 'B' was lost, at the supply, 'A' would be
180
°
out of phase with phase 'C' and the vector addition would equal zero at phase 'B'.
Содержание SR469
Страница 7: ......
Страница 19: ...2 INSTALLATION MECHANICAL 2 5 2 1 5 TERMINAL LOCATIONS Figure 2 11 TERMINAL LAYOUT...
Страница 21: ...2 INSTALLATION ELECTRICAL 2 7 Figure 2 12 TYPICAL WIRING DIAGRAM...
Страница 32: ...ELECTRICAL 2 INSTALLATION 2 18 2 2 14 TYPICAL 2 SPEED MOTOR WIRING...
Страница 39: ...OVERVIEW 3 SR469 OPERATION 3 6 yy SETPOINTS yy S1 SR469 SETUP...
Страница 104: ...4 SETPOINT PROGRAMMING S11 MONITORING 4 65 Figure 4 24 TRIP COIL SUPERVISION...
Страница 113: ...S12 ANALOG I O 4 SETPOINT PROGRAMMING 4 74...
Страница 244: ...8 469PC PROGRAM WAVEFORM CAPTURE 8 13 Figure 8 11 WAVEFORM CAPTURE...