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1MRS755225
Transformer Terminal
Technical Reference Manual, General
RET 54_
25
5.1.1.2.
Measurement functions
The measurement function blocks are documented on the CD-ROM “Technical
Descriptions of Functions” (refer to “Related documents” on page 9).
NPS3Low
Negative-phase-sequence (NPS) protection, low-set stage
NPS3High
Negative-phase sequence (NPS) protection, high-set stage
OE1Low
Overexcitation protection, low-set stage U/f>
OE1High
Overexcitation protection, high-set stage U/f>>
OV3Low
Three-phase overvoltage protection, low-set stage
OV3High
Three-phase overvoltage protection, high-set stage
PSV3St1
Phase-sequence voltage protection, stage 1
PSV3St2
Phase-sequence voltage protection, stage 2
REF1A
High-impedance based restricted earth-fault protection
REF4A
Stabilized restricted earth-fault protection (high voltage side)
REF4B
Stabilized restricted earth-fault protection (low voltage side)
ROV1Low
Residual overvoltage protection, low-set stage
ROV1High
Residual overvoltage protection, high-set stage
ROV1Inst
Residual overvoltage protection, instantaneous stage
TOL3Dev
Three-phase thermal overload protection for devices
UI6Low
Three-phase underimpedance protection, low-set stage
UI6High
Three-phase underimpedance protection, high-set stage
UV3Low
Three-phase undervoltage protection, low-set stage
UV3High
Three-phase undervoltage protection, high-set stage
Table 5.1.1.1-1
Protection functions available for the RET 54_
Function
Description
Table 5.1.1.2-1
Measurement functions available for the RET 54_
Function
Description
MEAI1
General measurement 1 / analog input on RTD/analog module
MEAI2
General measurement 2 / analog input on RTD/analog module
MEAI3
General measurement 3 / analog input on RTD/analog module
MEAI4
General measurement 4 / analog input on RTD/analog module
MEAI5
General measurement 5 / analog input on RTD/analog module
MEAI6
General measurement 6 / analog input on RTD/analog module
MEAI7
General measurement 7 / analog input on RTD/analog module
MEAI8
General measurement 8 / analog input on RTD/analog module
MEAO1
Analog output 1 on RTD/analog module
MEAO2
Analog output 2 on RTD/analog module
MEAO3
Analog output 3 on RTD/analog module
MEAO4
Analog output 4 on RTD/analog module
MECU1A
Neutral current measurement, stage A
MECU1B
Neutral current measurement, stage B
MECU3A
Three-phase current measurement, stage A
MECU3B
Three-phase current measurement, stage B
MEDREC16
Transient disturbance recorder
MEFR1
System frequency measurement
MEPE7
Three-phase power and energy measurement
MEVO1A
Residual voltage measurement, stage A
MEVO1B
Residual voltage measurement, stage B