Setting Parameters - ABB RET670 Applications Manual

Section 3
IED application
3.9.2.3
Table 140: SAPTOF (81) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
VBase 0.05 - 2000.00
PUFrequency 35.00 - 75.00
IntBlockLevel 0 - 100
TimeDlyOperate 0.000 - 60.000
TimeDlyReset 0.000 - 60.000
546
Equipment protection, such as for motors and generators
The setting has to be well above the highest occurring "normal" frequency and well
below the highest acceptable frequency for the equipment.
Power system protection, by generator shedding
The setting must be above the highest occurring "normal" frequency and below the
highest acceptable frequency for power stations, or sensitive loads. The setting level,
the number of levels and the distance between two levels (in time and/or in frequency)
depend very much on the characteristics of the power system under consideration. The
size of the "largest loss of load" compared to "the size of the power system" is a critical
parameter. In large systems, the generator shedding can be set at a fairly low frequency
level, and the time delay is normally not critical. In smaller systems the frequency
PICKUP level has to be set at a higher value, and the time delay must be rather short.
Equipment protection, such as for motors and generators
The setting has to be well above the highest occurring "normal" frequency and well
below the highest acceptable frequency for the equipment.
Power system protection, by generator shedding
The setting level, the number of levels and the distance between two levels (in time and/
or in frequency) depend very much on the characteristics of the power system under
consideration. The size of the "largest loss of load" compared to "the size of the power
system" is a critical parameter. In large systems, the generator shedding can be set at a
fairly low frequency level, and the time delay is normally not critical. In smaller
systems the frequency pickup level has to be set at a higher value, and the time delay
must be rather short.

Setting parameters

Unit Step
- -
kV 0.05
Hz 0.01
%VB 1
s 0.001
s 0.001
Default Description
Disabled Disable/Enable Operation
400.00 Base voltage
51.20 Frequency setting pickup value.
50 Internal blocking level in % of VBase.
0.000 Operate time delay in over/under-frequency
mode.
0.000 Time delay for reset.
1MRK504116-UUS C
Application manual