Table. 5.4.24 - 204. General settings of the function.
Name
Range
Default
Description
Z< LN
mode
1: On
2: Blocked
3: Test
4: Test/Blocked
5: Off
0: On
Set mode of UIM block.
This parameter is visible only when
Allow setting of individual LN mode is
enabled in
General menu.
Operation
mode
1: P-E
Impedances
2: P-P
Impedances
3: Pos. seq.
Impedance
1: P-E
Impedance
Selects the used impedances.
Pick-up
The
Z
set
(pri)< setting parameter controls the the pick-up of the Z< function. This defines the
minimum allowed measured impedance before action from the function. The function constantly
calculates the ratio between the impedance pick-up leveland the calculated impedance for each of the
three stages or the positive sequence impedance. The reset ratio of 103 % is built into the function and
is always relative to the current pick-up value.
Table. 5.4.24 - 205. Pick-up settings.
Name
Description
Range
Step
Default
Z
set
(pri)<
Pick-up setting as primary side impedance
0.10…150.00
Ω
0.01
Ω
10
Ω
The pick-up activation of the function is not directly equal to the START signal generation of the
function. The START signal is allowed if the blocking condition is not active.
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. 5.4.24 - 206. Information displayed by the function.
Name
Range
Step
Description
Z< LN
behaviour
1: On
2: Blocked
3: Test
4: Test/Blocked
5: Off
-
Displays the mode of UIM block.
This parameter is visible only when
Allow setting of individual LN mode is
enabled in
General menu.
Z< condition
0: Normal
1: Start
2: Trip
3: Blocked
-
Displays 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.
Z
meas
/Z
set
at
the moment
0.00...1250.00
0.01
The ratio between the lowest measured impedance and the pick-up value.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
259
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
