Three-Phase Current Measurement Cmmxu - ABB RELION REX640 Technical Manual

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1MRS759142 C

Technical Manual

The deadband supervision reports a new measurement value if the input signal has

gone out of the deadband state. The deadband supervision can be used in value

reporting between the measurement point and operation control. When the deadband

supervision is properly configured, it helps to keep the communication load to a

minimum and yet measurement values are reported frequently enough.

The instantaneous measurement values of several measurement functions are

available as primary values for further use in Application Configuration. The current

values are in amperes while voltage values are in kilovolts and power values in

kilovolt-amperes, watts or volt-amperes reactive.

Three-phase current measurement CMMXU

Identification

Function description

Three-phase current measurement

Function block

GUID-63A7DBC8-7FEC-4F97-9B07-552B903BB5D9 V1 EN

Function block

Functionality

The three-phase current measurement function CMMXU provides limit value

supervision output (HIGH_ALARM, HIGH_WARN, LOW_WARN, LOW_ALARM). The

delay of the activation and deactivation of these outputs can be controlled with setting

parameters On delay time and Off delay time.

Instantaneous phase currents (I_INST_A, I_INST_B and I_INST_C) are

provided as outputs in amperes. These can be used in the application configuration.

Phase current demand values (I_DMD_A, I_DMD_B and I_DMD_C) are provided as

outputs in amperes. These outputs are dedicated for Load profile recorder

Measurement functions

identification

ANSI/IEEE C37.2

device number

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