ABB 615 series Technical Manual page 697

1MAC059074-MB A
615 series ANSI
Technical Manual
δ − δ
i
0
f
=
slip
T
2
⋅ ⋅ π
oi
GUID-F94B7BCA-473F-42E1-95D5-EF5DF2DCC7C6 V1 EN
f Slip frequency
slip
T The time for the impedance to pass from the outer to the inner blinder.
oi
δ Swing angle at the outer blinder
0
δ Swing angle at the inner blinder
I
The swing angles, δ and δ
0
the blinders. It is the difference in these quantities that is important for determining the slip
frequency.
If the "Adaptive" option is selected, after detecting an OSB condition, the function further
examines the slip frequency f
(δ ) to determine if the trip is asserted on the way in or on the way out. TRIP is activated
0
on the way in, entering the mho circle from an inner blinder, if the relationship in
130 is true.
( )
π δ −
0
f
≤
slip
VoltagedipTm
π ⋅
GUID-4FEE5C5D-B60F-42E5-AFED-0EBE46145537 V1 EN
f Slip frequency
slip
δ Swing angle at the outer blinder
0
V dip time
VoltagedipTm Set
Otherwise, TRIP is activated on the way out, when the impedance exits an outer blinder
and the swing repeats for the set Max number slips count in the respective enabled zone
that the swing has passed through.
If the Swing time has elapsed but the impedance exits the inner blinder and continues
through the opposite blinders without passing through the mho circle, the SWING output
is activated. The SWING output remains activated for a time determined by the Reset time
setting unless another swing occurs before the reset time expires causing the output to
remain active for another Reset time interval. If this swing is repeated for the set Max Num
slips Zn3 count and the Zone 3 enable setting is "Yes", the SWING_TR output is activated.
The SWING_TR output remains activated for a time determined by the Trip dropout time
setting.
, are estimated from the measured impedance when crossing
I
, V dip time setting, and swing angle at the outer blinder
slip
Section 4
Protection functions
(Equation 129)
Equation
(Equation 130)
691