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1X00781H01L Power supply module

When the impedance crosses the slip line between ZB and ZC it counts as being in zone 1 and between ZC and ZA in zone 2. The entire distance ZA-ZB becomes zone 1 when 'EnableZone1' is enabled (external device detects the direction of the centre of slipping). After the first slip, the signals 'Zone1' or 'Zone2' and - depending on the direction of slip - either 'Generator' or 'Motor' are issued. Every time pole slipping is detected, the impedance of the point where the slip line is crossed and the instantaneous slip frequency are displayed as measurements.Further slips are only detected, if they are in the same direction and if the rate of rotor movement has reduced in relation to the preceding slip or the slip line is crossed in the opposite direction outside ZA-ZB. A further slip in the opposite direction within ZA-ZB resets all the signals and is then signalled itself as a first slip. 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 't-Reset'.

Detecting rotor slip and shift

 Rotor shift is detected by monitoring the voltage Ucos which is the component of the voltage in phase with the current. If the generator is faster than the power system, the rotor movement in the impedance and voltage diagram is from right to left and generating is signalled. If the generator is slower than the power system, the rotor movement is from left to right and motoring is signalled (the power system drives the generator as if it were a motor). The movements in the impedance plain can be seen from Fig. 3.5.26.1. The transient behaviour is described by the transient e.m.f's EA and EB, and by X'd, XT and the transient system impedance ZS. The detection of rotor angle is enabled when
the minimum current exceeds 0.10 IN
the maximum voltage falls below 0.92 IN
the voltage Ucos has an angular velocity of 0.2...8 Hz and
the corresponding direction is not blocked. An alarm is given when movement of the rotor is detected and the rotor angle exceeds the angle set for 'WarnAngle'. Slipping is detected when
a change of rotor angle of min. 50 ms is recognized
the slip line is crossed between ZA and ZB. When the impedance crosses the slip line between ZB and ZC it counts as being in zone 1 and between ZC and ZA in zone 2. The entire distance ZA-ZB becomes zone 1 when 'EnableZone1' is enabled (external device detects the direction of the centre of slipping). After the first slip, the signals 'Zone1' or 'Zone2' and - depending on the direction of slip - either 'Generator' or 'Motor' are issued. Every time pole slipping is detected, the impedance of the point where the slip line is crossed and the instantaneous slip frequency are displayed as measurements.