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APPENDIX
Power Quality Survey Procedures
Power quality survey procedures
Step 1:
Step 2:
Step 3:
Step 4:
Purpose
Location of problem (measurement target)
Advanced confirmation at site (collecting the site information)
Measure using a power quality analyzer
4-1.
4-2.
4-3.
4-4.
Normal condition measurement
Time plot recording for a certain period
Selecting the event parameters and thresholds
Long period measurement
Step 1: Purpose
Clearly confirm the purpose of the investigation: Purpose 1 or Purpose 2?
1. Researching the condition of the power quality
There is no specific problem with the power supply, but the condition of the power
quality at the site needs to be known.
Periodical power quality statistic research
$
Research before installing electric equipment
$
Step 2: Location of problem
Specify where the problem is occurring (identify the measurement site)
If measurement at multiple sites is possible, detecting the cause of the problem can be
easier and faster.
1.
Network circuit inside a substation
(Power companies only)
2. Receptacle point (high/low voltage)
3. Transformer panel, Distribution panel
4.
Power supply for electric equipment
(Outlet, etc.)
1.
Frequency:
50/60Hz
2.
Wiring:
1P2W/1P3W/3P3W2M/3P3W3M/3P4W
3.
Neutral line measurement:
ON/OFF (CH4)
4.
Nominal voltage:
100V to 600V
Points to confirm
2. Investigating the cause of a power abnormality
A quick solution needs to be found to counteract a problem with the power supply.
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