ABB RET670 Applications Manual

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.
3.9.2.3 Setting parameters
Table 140: SAPTOF (81) Group settings (basic)
Name
Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disable/Enable Operation
VBase 0.05 - 2000.00 kV 0.05 400.00 Base voltage
PUFrequency 35.00 - 75.00 Hz 0.01 51.20 Frequency setting pickup value.
IntBlockLevel 0 - 100 %VB 1 50 Internal blocking level in % of VBase.
TimeDlyOperate 0.000 - 60.000 s 0.001 0.000 Operate time delay in over/under-frequency
mode.
TimeDlyReset 0.000 - 60.000 s 0.001 0.000 Time delay for reset.
Section 3 1MRK504116-UUS C
IED application
546
Application manual

ABB RET670 Specifications

General

Rated Frequency	50/60 Hz
Inputs	Analog and binary inputs
Application	Protection of power systems
Communication Protocols	IEC 61850, DNP3, Modbus
Operating Temperature Range	-25°C to +55°C
Mounting	Rack mounted
Number of Binary Inputs	Up to 48
Number of Binary Outputs	32
Protection Functions	Overcurrent Protection
Outputs	Binary outputs
Enclosure	IP 54
Type	Line Differential Protection
Number of Analog Inputs	24