Displays up to two instances of OEX with 7 measurements per instance. These
measurements indicate whether values are out of the measuring range (ERROR) and
if the overexcitation function has caused a trip (TRIP). The thermal status as a
percentage of the trip level and the calculated time to trip are among the other outputs
available here.
11.6.6
View frequency protection values
The measurements generated by the Underfrequency, Overfrequency and Rate-of-
change of frequency functions are available under the paths outlined below.
11.6.6.1
Underfrequency protection (PTUF, 81)
Test/Function status/Frequency protection/Underfrequency(PTUF)/TUF
Displays up to six instances of TUF with five measurements indicating status of trip,
start, restore signals and showing possible blocking due to low amplitude as well as
the start duration as a percentage of the total operation time.
11.6.6.2
Overfrequency protection (PTOF, 81)
Test/Function status/Frequency protection/Overfrequency(PTOF)/TOF
Displays up to six instances of TOF with 4 measurements per instance consisting of
trip and start signal status. The start duration as percentage of the total trip time and
a blocking indication as a result of low voltage.
11.6.6.3
Rate-of-change frequency protection (PFRC, 81)
Test/Function status/Frequency protection/
RateOfChangeOfFrequency(PFRC)/RCF
Displays six instances of RCF with measurement data for trip and start signals. There
is also a restore signal for load restoring purposes, a start duration time and a blocking
indication caused by a drop in voltage.
11.6.7
Multipurpose protection
The data generated by the multipurpose function comprises various trip and start
signals, block of second harmonic detection, various measured current values and the
angle between current and voltage.
11.6.7.1
General current and voltage protection (PGPF)
Test/Function status/Multipurpose protection/GeneralCurrentVoltage(PGPF)/
GFO
Section 11
Test the IED
RET 670
Operator's manual
1MRK504049-UEN rev. D
63