124
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
The function block supervises the energizing circuits by comparing the measured
voltages. If one or two voltages exceed the setting “High limit”, while the measured
values of the remaining one or two voltages are below the “Low limit”, the output
ALARM is activated after the set alarm delay.
The function block is disabled if all input voltages are below the setting “Low limit”.
The ALARM output resets automatically when the fault disappears.
Fig. 7.4.4.-1
Function block symbol of MCS 3U
7.4.5.
TIME1
The time measuring block TIME1 is used for measuring the motor running time in
H07.
Fig. 7.4.5.-1
Function block symbol of TIME1
7.5.
Power quality
7.5.1.
PQ 3Inf
The function block PQ 3Inf for current waveform distortion measurement is used for
measuring the harmonics and monitoring the power quality in distribution networks.
Although the European Standard EN 50160 concerns voltage distortion, the same
standard is applied to current distortion measurements in PQ 3Inf. Measuring
principles for individual harmonics and THD are adapted from the International
standard IEC 61000-4-7. The American standard IEEE Std 1159 is also partly
supported.
The function block measures quasi-stationary (slowly varying) harmonics up to
13th. Distortion measurement does not include rapidly changing harmonics,
interharmonics or other spurious components.
Fig. 7.5.1.-1
Function block symbol of PQ 3Inf
ALARM
MCS 3U
CMVO3
TIME1
ALARM
TRIGG
RESET
HAR_HIGH
CUM_HIGH
PQ 3Inf
Содержание REX 521
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