Section 8
1MAC050144-MB C
Measurement functions
570
615 series ANSI
Technical Manual
a customer-driven issue. It could be said that any power problem concerning voltage or
current that results in a failure or misoperation of customer equipment is a power quality
problem.
Harmonic distortion in a power system is caused by nonlinear devices. Electronic power
converter loads constitute the most important class of nonlinear loads in a power system.
The switch mode power supplies in a number of single-phase electronic equipment, such
as personal computers, printers and copiers, have a very high third-harmonic content in the
current. Three-phase electronic power converters, that is, dc/ac drives, however, do not
generate third-harmonic currents. Still, they can be significant sources of harmonics.
Power quality monitoring is an essential service that utilities can provide for their
industrial and key customers. Not only can a monitoring system provide information 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.
PQI provides a method for monitoring the power quality by means of the current
waveform distortion. PQI provides a short-term 3-second average and a long-term demand
for TDD.
8.10.5
Signals
Table 484: CMHAI Input signals
Table 485: CMHAI Output signals
Name
Type
Default
Description
I_A
Signal
0
Phase A current
I_B
Signal
0
Phase B current
I_C
Signal
0
Phase C current
BLOCK
BOOLEAN
0=False
Block signal for all binary outputs
Name
Type
Description
ALARM
BOOLEAN
Alarm signal for TDD
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