ABB Relion 670 Series Applications Manual page 259

1MRK 511 401-UEN Rev. K
tPCrv : Set the programmable curve parameter P.
CrvSat : Set the tuning parameter that is used to compensate for the undesired discontinuity
created when the denominator in the equation for the customer programmable curve is equal
to zero.
tMin : Set the minimum time parameter for the programmable curve in seconds.
tReset : Set the reset time delay for all the warning, alarm, and trip outputs in seconds.
10.3.4 Setting examples
Example 1
Consider a 88 kV, 27.43 MVAr internally fused grounded single WYE connected filter that is
protected by the phase voltage differential protection function.
Table 40: Parameters of the grounded capacitor bank
Parameters of SCB
Connection type of SCB
Rated filter voltage
Filter rated MVAr
System frequency
Number of capacitor units per phase
Number of capacitor elements in a unit
Number of parallel group of elements in a unit
(P )
e
Number of series group of elements in a unit
(S )
e
Number of capacitor unit groups in series in a
phase (S
Number of parallel units in a group (P
Capacitive element value (C
VT ratio
Figure 121
Bay control REC670
Application manual
The timers related to trip outputs (TRLx and TRIP) start only if the setting
BlockTrip is set to Trip enabled .
)
u
)
e
shows the single line diagram for the grounded single WYE capacitor bank.
© Copyright 2017 Hitachi Power Grids. All rights reserved
Value
Internally fused grounded single WYE
88 kV
27.43 MVAr
60 Hz
1x2 = 2
14x3 = 42
14
3
2
) 1
u
4.026 µF
110 kV/100 V
Section 10
Unbalance protection
GUID-C9963349-6B07-4EA5-85E2-8AE0765A4D6C v1
GUID-57922A6F-191D-4380-96A2-B1608096F3B0 v1
253