Protective Elements
Input States of the Out-of-Step Tripping Module
Name Description Assignment via
ExBlo1-I Module input state: External blocking1 [Protection Para
/Global Prot Para
/OST]
ExBlo2-I Module input state: External blocking2 [Protection Para
/Global Prot Para
/OST]
ExBlo TripCmd-I Module input state: External Blocking of the Trip
Command
[Protection Para
/Global Prot Para
/OST]
Signals (Output States) of the Out-of-Step Tripping Module
Signal Description
active Signal: active
ExBlo Signal: External Blocking
Blo TripCmd Signal: Trip Command blocked
ExBlo TripCmd Signal: External Blocking of the Trip Command
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.
Operate Signal: The module is ready to send a trip command. The state of this signal
becomes true as soon as the impedance traverses the second blinder, and
it gets reset after the impedance has left the MHO circle.
Alarm Signal that the module has started, i. e. the impedance has entered the
MHO circle and crossed the first blinder. »Alarm« is reset when the
measured impedance has left the MHO circle without an »Operate«, or
when the »Trip« signal is reset. If »Max.Num.Pole Slips« is greater than 1,
the »Alarm« signal stays active until the »Trip« signal is reset or the »Reset
Time« has expired.
Trip Signal: Trip
TripCmd Signal: Trip Command
813 MCDGV4 DOK-HB-MCDGV4-2E
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