ABB REG670 - Page 264

The TRIP1 tripping command and signal are generated after N1 slips in zone 1,
providing the rotor angle is less than TripAngle. The TRIP2 signal is generated after
N2 slips in zone 2, providing the rotor angle is less than TripAngle.
All signals are reset if:
• the direction of movement reverses
• the rotor angle detector resets without a slip being counted or
• no rotor relative movement was detected during the time ResetTime.
Ucos< 0.92 UBase
IEC07000005.vsd
Imin > 0.10 IBase
0.2  Slip.Freq.  8 Hz
AND
  startAngle
AND
START
Z cross line ZA - ZC
Z cross line ZC - ZB
AND
AND
ZONE1
ZONE2
Counter
N1Limit
a
b
a  b
  tripAngle
AND
TRIP1
Counter
N2Limit
a
b
a  b
AND
TRIP2
OR
TRIP
IEC07000005 V2 EN
Figure 109: Simplified logic diagram for pole slip protection PSPPPAM
Section 7 1MRK502052-UEN B
Impedance protection
258
Technical manual