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1MRS750881-MUM
REC 523
29
Remote Monitoring and Control Unit
Technical Reference Manual
Overtemperature indication is available in the configuration and can be connected to
any signal output of the device. The overtemperature indication input in the
configuration is as follows:
• REC 523: PSC_7_TempAlarm
5.3.
Analogue channels
5.3.1.
Design
The REC 523 device measures the analogue signals needed, for example, for
measuring, via sensors or galvanically separated matching transformers. REC 523
can be provided with the following matching transformers:
• 3 matching transformers; CT1, CT2, CT3
• 6 matching transformers; CT1, CT2, CT3, VT1, VT2, VT3
• 7 matching transformers; CT1, CT2, CT3, CT4, VT1, VT2, VT3
• 9 matching transformers; CT1, CT2, CT3, CT4, CT5, VT1, VT2, VT3, VT4
• 9 matching transformers; CT1, CT2, CT3, CT4, CT5, CT6, VT1, VT2, VT3
• 9 matching transformers; CT1, CT2, CT3, VT1, VT2, VT3, VT4, VT5, VT6
• 9 sensors; RS or VD
In addition to conventional matching transformers, current sensors and voltage
dividers developed by ABB can be used. Depending on the hardware equipment,
REC 523 has 9 sensor inputs. A current sensor (Rogowski coil) or a voltage divider
can be used with the REC 523 device.
Each REC 523 has the maximum of 9 analogue channels. The number of channels
used depends on the configuration and the kind of matching transformers or sensor
inputs used. Furthermore, the device includes virtual analogue channels (refer to
Section 5.3.3. Calculated analogue channels) for calculating the neutral current,
phase-to-phase voltage and residual voltage from phase currents and voltages.
Each analogue channel is separately configured with the Relay Configuration Tool.
Configure both the measuring unit for each analogue channel and the signal type to
be measured.
The REC 523 versions have the following analogue channels:
Table 5.3.1-1
REC 523 versions and analogue channels
REC 523 version
Analogue channel
REC523F 032AAA (wall-mounted)
REC523F 037AAA (flush-mounted)
3 current transformers 1/5 A
U
aux
= 80-265 V AC/DC
REC523F 032CAA (wall-mounted)
REC523F 037CAA (flush-mounted)
3 current transformers 1/5 A
U
aux
= 18-80 V DC
REC523F 033AAA (wall-mounted)
REC523F 038AAA (flush-mounted)
3 current transformers 1/5 A
3 voltage transformers 100 V
U
aux
= 80-265 V AC/DC
REC523F 033CAA (wall-mounted)
REC523F 038CAA (flush-mounted)
3 current transformers 1/5 A
3 voltage transformers 100 V
U
aux
= 18-80 V DC