ABB RET 541 Product Manual page 16

16
Transformer Terminal
Table 5: On-load tap changer controller function block
On load tap changer control function (voltage regulator), COLTC
Reference voltage
Delay time for the 1st control pulse
Delay time for the 2nd control pulse
Resistive line-drop compens. factor (Ur)
Reactive line-drop compens. factor (Ux)
Load phase angle (in NRP mode)
Stability factor in parallel operation
Operation mode
Delay mode
Raise and lower pulse duration
Bandwith
Overcurrent blocking limit
Undervoltage blocking limit
Overvoltage blocking limit
High circ. current blocking limit
Max limit for LDC term
Reduce Set Voltage step
Max volt tap
Min volt tap
Max parallel trafos in MCC mode
Operation accuracies
- voltage measurement:
- operation time DT mode:
- operation time IDMT mode:
- lower and raise output pulse duration:
Reset ratio (hysteresis)
Table 6: Measurement function blocks
General measurement/ analog input on RTD/analog module, MEAI1...8
The general measurement function blocks can be used to measure general purpose dc or ac voltage
signals with a sensor input. They also include a REAL type input which can be used to monitor any internal
REAL type IEC 61131-3 based signal, e.g. input data from the RTD/analog module.
GE1...3 (V dc/ac)
General REAL type input
Analog output on RTD/analog module, MEAO1...4
The analog output function blocks handle the scaling of any internal REAL type IEC 61131-3 based signal
to fit a selectable 0...20 mA or 4...20 mA range for use with the outputs on the RTD/analog module.
General REAL type input
Neutral current measurement, MECU1A and MECU1B
Io (A)
Io (%)
RET 541, RET 543, RET 545
0.000 ... 2.000 xUn
1.0 ... 300.0 s
1.0 ... 300.0 s
0.0 ... 25.0 %Un
0.0 ... 25.0 %Un
-89 ... +89 deg
0.0 ... 70.0 %Un
Not in use
Manual
Automatic single
Automatic master
Automatic follower
Negative Reactance Principle
Minimizing Circulating Current
Controlled via op.mode inputs
Definite time
Inverse time
0.5 ... 10.0 s
0.60 ... 9.00 %Un
0.10 ... 5.00 xIn
0.10 ... 1.20 xUn
0.80 ... 1.60 xUn
0.10 ... 5.00 xIn
0.00 ... 2.00 xUn
0.00 ... 9.00 %Un
-36 ... 36
-36 ... 36
4
Depends on the frequency of the voltage measured:
f/fn = 0.95 ... 1.05: +1.0% of the set value or
+0.01xUn
+1% of the set value or +250 ms
250ms and an inaccuracy which occurs when
voltage varies +0.5%
+100 ms
20% of the set Bandwith
-10000.00000...10000.00000
-10000.00000...10000.00000
-10000.00000...10000.00000
0.0...20000.0 A
0.0...80.0% In
1MRS755543