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
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