ABB RELION REB500 Technical Manual page 95

1MRK 505 406-UEN B
Table 67:
Signal
DL1
DL2
DL3
REL_DH
DH
DL1L2L3
D3PH
D1PH
Power swing blocking
The purpose of the power swing blocking function is to prevent unwanted tripping of the
distance protection function in response to power system instability with oscillatory
fluctuations of power (power swings) or loss of synchronism (out-of-step). The power swing
blocking function does not influence the operation of the back-up overcurrent function.
When power swings occur, the electrical parameters of the system vary at a slower or faster
rate in relation to the angle δ be-tween the voltage vectors of the energy sources in different
parts of the system. In the case of a fault on the other hand, step changes of these parameters
take place. The parameters, which regardless of location are subject to appreciable variation in
the general region around phase opposition (δ = 180°), are the resistance R and the voltage
component U × cosϕ. The value of ϕ corresponds to the angle between phase voltage and
current.
Bay protection functions REB500
Technical manual
Signals TRIP 4
In
X
X
X
X
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Out Source
Binary output: TRIP CB L1
Binary output: TRIP CB L2
Binary output: TRIP CB L3
TRIP3
X Binary output: Trip Com Rec
X Binary output: TRIP L1L2L3
X Binary output: Trip CB 3PH
X Binary output: Trip CB 1PH
Section 5
Bay protection functions
Drain
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