Rate-Of-Change Frequency Protection Sapfrc (81); Underfrequency Protection Saptuf (81); Multipurpose Protection; General Current And Voltage Protection Cvgapc - ABB REL670 Operator's Manual

1MRK506276-UUS B
11.6.6.2
11.6.6.3
11.6.7
11.6.7.1
Operator's manual
Displays available instances of SAPTOF (81) with some measurements per instance
consisting of trip and pickup signal status. The pickup duration as percentage of the
total trip time and a blocking indication as a result of low voltage.

Rate-of-change frequency protection SAPFRC (81)

Main menu/Test/Function status/Frequency protection/
RateOfChangeOfFrequency(PFRC)/RCF
Displays available instances of SAPFRC (81) with measurement data for trip and
pickup signals. There is also a restore signal for load restoring purposes, a pickup
duration time and a blocking indication caused by a drop in voltage.

Underfrequency protection SAPTUF (81)

Main menu/Test/Function status/Frequency protection/UnderFrequency(PTUF,
81)/TUF
Displays available instances of SAPTUF (81) with some measurements indicating
status of trip, pickup, restore signals and showing possible blocking due to low
magnitude as well as the pickup duration as a percentage of the total operation time.

Multipurpose protection

The data generated by the multipurpose function comprises various trip and pickup
signals, block of second harmonic detection, various measured current values and the
angle between current and voltage.

General current and voltage protection CVGAPC

Main menu/Test/Function status/Multipurpose protection/
GeneralCurrentVoltage(GAPC)/GFO
Displays available instances of CVGAPC with a number of output quantities per
instance. These include error signals from overcurrent functions, trip and pickup
signals from overcurrent, undercurrent, overvoltage and undervoltage. There is a block
signal caused by second harmonic detection. The directional mode of OC1 and OC2 is
shown as is low voltage for directional polarization. The current and voltage as well as
measured current multiplied by cos Phi and the angle between voltage and current are
also shown here.
Section 11
Test the IED
81