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Identifying
the Source of Voltage Sags Is Key
Traditionally
one of the most common power quality problems, voltage sags
are capable of causing hours of downtime. For today’s
computer-dependent businesses, even the smallest sags can
produce substantial problems, from loss of data to disruption
of the production line. Because voltage sags can be caused
by multiple factors, both by internal events such as the start-up
of a large load or by a fault on the power system itself,
they have been difficult to address. Key to resolving the
problem is identifying the source of the problem — and
whether that problem is inside the facility or in the distribution
network of the supplier. Within the facility, the sag directivity
AnswerModule can determine where the sag occurred in relation
to the monitoring location.
Voltage
Sags Are Identified and the Fault is Located
The
RMS Voltage Sag Directivity AnswerModule detects a voltage
sag event, identifies its characteristics and determines the
direction of its location relative to the monitoring point.
The AnswerModule is invoked when both waveform and RMS records
of the event are present. Using proprietary techniques, the
AnswerModule compares RMS magnitudes computed from both current
and voltage waveforms, tracking positive sequence phase angle
changes from pre-fault to post-fault. Based on this data,
thedirection of the fault is determined with a high degree
of accuracy, enabling power customers to determine whether
the fault occurred upstream or downstream of the monitoring
point.
Details
Available in Real Time from any Web Browser
The
details of each RMS voltage sag are added to the details of
the event and are available in real time by using an Internet
browser. Just as important, the information can be shared
with colleagues and customers who have access to the Internet.
The RMS Voltage Sag Directivity does not require users to
enter specific setup information, allowing for fast-track
startup, and can be installed remotely.
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