Application Note

2 Fluke Corporation Troubleshooting commercial lighting loads
The Fluke 43B P
ower Quality Analyzer trends
voltage (top) and current (b
ottom) simultane-
ously. Current swells/ inrush caused voltage
sags, indicating that a load downstream from
the measurement point is the cause of the
disturbanc
e.
The Fluke 430 Series Power Quality Analyzers
trend all three phases and compares interac-
tion between the loads.
4. Voltage stability
The sags and swells mode of
power quality analyzers is
especially useful for recording
repetitive voltage sags which can
show up as flickering lights. Both
current and voltage are moni-
tored simultaneously. This helps
us tell if sags are downstream of
the measuring point (load-
related) or upstream (source-
related). For example, if voltage
sags while current swells, a
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etherlands
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ax (425) 446-5
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ax (9
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©2004 Fluke Corporation
. All rights reserved.
Printed in U.S.A. 10/2004 2403043 A-US-N Rev A
Fluke. K
e
eping your world
up and running.
Ø1
Ø2
Ø3
N
Lighting Panel
ABC
277 V Phase-to-Neutral
480 V Phase-to-Phase
Single phase analyzers measure each ballast separately, requiring manual calculations.
Three phase analyzers measure all three phases simultaneously and perform the calcula-
tions automatically.
downstream current inrush likely
caused the sag. If both voltage
and current sag, some event
upstream caused the sags
.
It c
ould b
e an upstream load
like a motor on a parallel branch
c
ircuit which drew dow
n the
feeder voltage. Or it c
ould be
source voltage-related, for
example, a lightning strike or
breaker trip/reclosure on the
utility distribution system.