Protective Elements
Input States of the Power Swing Blocking Module
Name Description Assignment via
ExBlo1-I Module input state: External blocking1 [Protection Para
/Global Prot Para
/PSB]
ExBlo2-I Module input state: External blocking2 [Protection Para
/Global Prot Para
/PSB]
Signals (Output States) of the Power Swing Blocking Module
Signal Description
active Signal: active
ExBlo Signal: External Blocking
Blo by MeasCircSupv Blocked by Measuring Circuit Supervision
Int.blocked Signal: The module is internally blocked because the »Max. dwell time« has
expired.
Pickup Blinder A Signal: The impedance is within the MHO circle on the right side of Blinder
A.
Pickup Blinder B Signal: The impedance is within the MHO circle on the left side of Blinder B.
Pickup Mho Signal: The impedance is within the characteristic.
Swinging Signal: The impedance is within the instable swing zone (i. e. within the
characteristic and inside the borders defined by Blinders A and B).
Start Signal, that a power swing (or an Out-of-step event) has been detected. The
state of this signal becomes true as soon as the impedance traverses the
first blinder, and it gets reset when the characteristic area is left.
Pole slipping Signal, that pole slipping has been detected. The state of this signal
becomes true as soon as the impedance reaches 180°, and it gets reset
when the characteristic area is left.
Syst.is sym. Signal that the system state is symmetrical, i. e. the negative-sequence
current is below »I2 max«, and the positive-sequence current is above »I1
min«.
Blo dZ/dt Signal: The module has detected a system fault based on the »rate of
impedance change per time«, and therefore it has blocked itself.
Blo min.dwell time Signal: The module has detected a system fault based on the »minimum
dwell time«, and therefore it has blocked itself.
862 MCDGV4 DOK-HB-MCDGV4-2E
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