Read-only parameters
The relay's
Info page displays useful, real-time information on the state of the protection function. It is
accessed either through the relay's HMI display, or through the setting tool software when it is
connected to the relay and its Live Edit mode is active.
Table. 5.3.14 - 133. Information displayed by the function.
Name
Range
Step
Description
V/
Hz> condition
0: Normal
1: Start
2: Alarm
3: Trip
4: Blocked
-
Displays the status of the protection function.
Expected
operating
time
0.000...1800.000s
0.005s
Displays the expected operating time when a fault occurs.
Time
remaining to
trip
-1800.000...1800.000s 0.005s
When the function has detected a fault and counts down time
towards a trip, this displays how much time is left before tripping
occurs.
U/f atm to
pick-up U/f
ratio
-100.00...100.00%
0.01P
m
/P
set
The ratio between the measured power and the pick-up value.
Nominal U/f
-100.000...100.000V/
Hz
0.001V/Hz
Nominal volts-per-hertz ratio (voltage in per-unit value divided by
nominal frequency). When 50Hz is used nominal U/f
U/f at the
moment
-100.000...100.000V/
Hz
0.001V/Hz
Volts-per-hertz at the moment.
U/f atm to
nominal U/f
ratio
-100.000...100.000V/
Hz
0.001V/Hz
Measured volts-per-hertz ratio divided by nominal volts-per-hertz
ratio.
Function blocking
The block signal is checked in the beginning of each program cycle. The blocking signal is received
from the blocking matrix in the function's dedicated input. If the blocking signal is not activated when
the pick-up element activates, a START signal is generated and the function proceeds to the time
characteristics calculation.
If the blocking signal is active when the pick-up element activates, a BLOCKED signal is generated and
the function does not process the situation further. If the START function has been activated before the
blocking signal, it resets and processes the release time characteristics similarly to when the pick-up
signal is reset.
The blocking of the function causes an HMI display event and a time-stamped blocking event with
information of the startup voltage values and its fault type to be issued.
The blocking signal can also be tested in the commissioning phase by a software switch signal when
the relay's testing mode "Enable stage forcing" is activated (
General
→
Device).
The variables the user can set are binary signals from the system. The blocking signal needs to reach
the device minimum of 5 ms before the set operating delay has passed in order for the blocking to
activate in time.
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
199