Measured input
Sufficient current and voltage measurements are required for the impedance measurement to work
properly. The user can select the monitored magnitude to be equal to either phase-to-earth impedance
loops, phase-to-phase impedance loops, or the positive sequence impedance. A -20ms averaged
value of the selected magnitude is used for pre-fault data registering.
Please note that impendance calculations are enable in
Measurement
→
Impedance Calculations
→
Impedance calc. settings to ensure that the function calculates the listed values.
Table. 5.3.15 - 136. Measurement inputs of the Z< function.
Signal
Description
Time base
Z1
Impedance of phase-to-earth (P1-E)
5ms
Z2
Impedance of phase-to-earth (P2-E)
5ms
Z3
Impedance of phase-to-earth (P3-E)
5ms
Z12
Impedance of phase-to-phase (P1-P2)
5ms
Z23
Impedance of phase-to-phase (P2-P3)
5ms
Z31
Impedance of phase-to-phase (P3-P1)
5ms
Pos.Seq.Imp
Positive sequence impedance
5ms
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. 5.3.15 - 137. 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. 5.3.15 - 138. Information displayed by the function.
Name
Range
Step
Description
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.
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
202
Содержание AQ-T215
Страница 1: ...AQ T215 Transformer protection IED Instruction manual...
Страница 266: ...Figure 5 4 4 167 Connecting mA input to option card A AQ Q T215 T215 Instruction manual Version 2 04 265...
Страница 358: ...Figure 7 3 216 Example block scheme A AQ Q T215 T215 Instruction manual Version 2 04 357...
Страница 380: ...Figure 8 14 239 Panel cutout dimensions and device spacing A AQ Q T215 T215 Instruction manual Version 2 04 379...
Страница 409: ...10 Ordering information A AQ Q T215 T215 Instruction manual Version 2 04 408...