ABB RET 541 Product Manual page 17

Transformer Terminal
Three-phase current measurement, MECU3A and MECU3B
IL1
IL2
IL3
IL1
IL2
IL3
IL1 demand
IL2 demand
IL3 demand
IL1 demand
IL2 demand
IL3 demand
Transient disturbance recorder for 16 analog channels, MEDREC16
The transient disturbance recorder MEDREC16 is used for recording the current and voltage waveforms,
as well as the status data of internal IEC 61131-3 based logic signals and digital inputs connected to the
transformer terminals. Maximum 16 analog inputs and 16 logic signal inputs are available. One
fundamental cycle contains 40 samples.
Operation mode
Pre-trg time
Over limit ILx
Over limit Io
Over limit Iob
Over limit Uo
Over limit Ux
Over limit Uxy
Over limit U12b
Over limit ILxb
Under limit Ux
Under limit Uxy
AI filter time
The recording can be triggered by any (or several) of the alternatives listed below:
• triggering on the rising or falling edge of any (or several) of the digital inputs
• triggering on overcurrent, overvoltage or undervoltage
• manual triggering via the menu or with the push-button F on the front panel (if configured)
• triggering via serial communication
• periodic triggering
The recording length depends on the number of recordings and inputs used. For example, the following
combination of recording length, number of recordings and number of inputs is available at 50 Hz (60 Hz):
 recordings \  inputs
1
5
10
System frequency measurement, MEFR1
Frequency
Average Freq.
Voltage U
RET 541, RET 543, RET 545
0.0...20000.0 A
0.0...20000.0 A
0.0...20000.0 A
0.0...1000.0% In
0.0...1000.0% In
0.0...1000.0% In
0.0...20000.0 A
0.0...20000.0 A
0.0...20000.0 A
0.0...1000.0% In
0.0...1000.0% In
0.0...1000.0% In
Saturation
Overwrite
Extension
0...100%
0.00...40.00 x In
0.00...40.00 x In
0.00...40.00 x In
0.00...2.00 x Un
0.00...2.00 x Un
0.00...2.00 x Un
0.00...2.00 x Un
0.00...40.00 x In
0.00...2.00 x Un
0.00...2.00 x Un
0.000...60.000 s
1 3
1163 cyc. 412 cyc.
23.3 s (19.4 s) 8.2 s (6.9 s)
232 cyc. 82 cyc.
4.6 s (3.9 s) 1.6 s (1.4 s)
115 cyc. 41 cyc.
2.3 s (1.9 s) 0.8 s (0.7 s)
10.00...75.00 Hz
10.00...75.00 Hz
0.0...2.0 x Un
1MRS755543
10
126 cyc.
2.5 s (2.1 s)
25 cyc.
0.5 s (0.4 s)
12 cyc.
0.24 s (0.2 s)
17