ABB Relion 620 Series, Руководство по применению

Страница: 59 / 90

1MAC308145-MB E
Section 3
RER620 application
RER620 53
Application Manual
3.3.3 Functional diagrams for measurements
The current input to the RER620 is measured by the CMMXU1 (three-phase current
measurement) function block. The current input is connected to the X12O card in the back
plane. The CSMSQI (sequence current measurement) function block measures the
sequence currents. The measurements can be seen from the LHMI and is available using
the Measurement option in the menu selection. The ground current is measured by the
RESCMMXU (residual current measurement). Based on the settings, these blocks can
generate low alarm/warning, high alarm/warning signals for the measured current values.
Figure 36: Current measurements
The voltage inputs to the RER620 connected through the X130 card are measured using
the VMMXU function block. There are two blocks available to measure the voltage inputs
from two sources. The two sources can be from the recloser and the external voltage
transformer. This block also generates the high alarm/warning and low alarm/warning
signal based on the preset levels.
Figure 37: Voltage measurements
The power measurement in RER620 is handled by the APEMMXU block. The
APEMMXU block calculates the single and three phase active power, reactive power,
apparent power, power factor and three phase energy quantities based on the analog inputs.
The output values of this block can be seen in the LHMI menu or available to the external
world through communications. Please refer the RER620 technical manual for additional
details about the function block. Also, refer the RER620 Modbus point list manual,
RER620 DNP Point list manual and PG&E 2179 Point list manual for available data
through communications.
CMMXU1(IA,IB,IC
BLOCK HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
RESCMMXU1(IG;Io
BLOCK HIGH_ALARM
HIGH_WARN
CSMSQI1(I1,I2,I
VMMXU1(VA,VB,VC
BLOCK HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
VMMXU2(VA,VB,VC
BLOCK HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
VSMSQI1(V1,V2,V VSMSQI2(V1,V2,V