ABB REC 523 Technical Reference Manual

Contents

ABB REC 523 Technical Reference Manual Manual pdf 19 page image

1MRS750881-MUM REC 52319Remote Monitoring and Control UnitTechnical Reference Manual5. Functional description5.1. REC 523 functionsThe functions of REC 523 are categorized as:ï Measurement functionsï Control functionsï Protection and fault indication functionsï Condition monitoring functionsï Power quality functionsï Communication functionsï Standard functionsï General functions5.1.1. Measurement functionsCurrent measurement can be based on Rogowski coils or conventional currenttransformers. Correspondingly, voltage dividers or voltage transformers are used forvoltage-based measurement.Measurement functions are available, for example, for three-phase currents, neutralcurrent, three-phase voltages, residual voltage, frequency, and active and reactivepower. One REC 523 device can be used to measure 2 feeders or branches by meansof 9 analogue channels.Furthermore, REC 523 incorporates environmental temperature and battery voltagemeasurements. The values measured can be forwarded to the control centre.The measurement function blocks are documented on the CD-ROM TechnicalDescriptions of Functions (refer to Section 1.8. Related documents)Table 5.1.1-1 Measurement functions available for REC 523Function DescriptionMEAI1...MEAI8aa. This function is supported in the REC 523 software revision C, or later.General measurement 1...8/analogue input on RTD/analogue moduleMECU1A Neutral current measurement, stage AMECU1B Neutral current measurement, stage BMECU3A Three-phase current measurement, stage AMECU3Ba Three-phase current measurement, stage BMEVO1A Residual voltage measurement, stage AMEVO1Ba Residual voltage measurement, stage BMEVO3A Three-phase voltage measurement, stage AMEVO3Ba Three-phase voltage measurement, stage BMEPE7 Three-phase power and energy measurementMEFR1 System frequency measurementMEDREC16 Transient disturbance recorder