Signals - ABB RELION Series Technical Manual

1MRS758755 A
10.1.6
10.1.7
Table 683: CMHAI Non group settings (Basic)
Parameter Values (Range)
Operation
Demand interval
Demand window
TDD alarm limit
Table 684: CMHAI Non group settings (Advanced)
Parameter Values (Range)
Initial Dmd current
REC615 and RER615
Technical Manual
about system disturbances and their possible causes, it can also detect problem
conditions throughout the system before they cause customer complaints, equipment
malfunctions and even equipment damage or failure. Power quality problems are not
limited to the utility side of the system. In fact, the majority of power quality problems
are localized within customer facilities. Thus, power quality monitoring is not only an
effective customer service strategy but also a way to protect a utility's reputation for
quality power and service.
CMHAI provides a method for monitoring the power quality by means of the current
waveform distortion. CMHAI provides a short-term 3-second average and a long-
term demand for TDD.

Signals

Table 681: CMHAI Input signals
Name
I_A
I_B
I_C
BLOCK
Table 682: CMHAI Output signals
Name
ALARM
Settings
Unit
1=on
5=off
0=1 minute
1=5 minutes
2=10 minutes
3=15 minutes
4=30 minutes
5=60 minutes
6=180 minutes
1=Sliding
2=Non-sliding
1.0...100.0 %
Unit
0.10...1.00 xIn
Power quality measurement functions
Type Default Description
Signal 0 Phase A current
Signal 0 Phase B current
Signal 0 Phase C current
BOOLEAN 0=False Block signal for all binary outputs
Type Description
BOOLEAN Alarm signal for TDD
Step Default
1=on
2=10 minutes
1=Sliding
0.1 50.0
Step Default
0.01 1.00
Section 10
Description
Operation Off / On
Time interval for demand calculation
Demand calculation window type
TDD alarm limit
Description
Initial demand current
675