Hioki PW3198 User Manual

Appendix 1 Procedure for Investigating Power Supply Quality
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Collect information (site data) from as many locations as possible to prepare for the investigation. Check
the following:
1. Connection (1P2W/1P3W/3P3W2M/3P3W3M/3P4W/3P4W2.5E)
2. Nominal input voltage (100 to 600 V)
3. Frequency (50/60 Hz)
4. Need for neutral wire measurement and DC voltage measurement
5. Current capacity (necessary in order to select clamp sensor to use for measurement)
6. Other items related to the facility as a whole (check for presence of other systems with malfunctioning
power supplies, principal electrical system operating cycle, additions or changes to facility equipment,
facility distribution circuitry)
Measurements are performed using the following procedure:
1. Perform quick setup and adjust the relevant settings.
• Connect the measurement line and select the quick setup according to your objective.(When using the
instrument to identify a power supply malfunction whose cause is unknown, it is recommended to
select the voltage abnormality detection pattern.)
• Verify that the proper connection has been selected on the [SYSTEM] screen and that the settings
have been configured appropriately (nominal input voltage, frequency, range, interval time, etc.). Verify
that events are not being generated too frequently.
• If, based on the information obtained in Steps 2 and 3 above, you find that some necessary settings have
not been configured by the quick setup process, reconfigure them on the [SYSTEM] screen.
• Check instantaneous values (voltage level, voltage waveform, current waveform, voltage waveform
distortion [THD]) on the [VIEW] screen.
2. Start recording.
•Press the START/STOP button to start recording. (Thresholds will have already been set during the
quick setup process.)
• Check the event detection state on the [EVENT] screen. If necessary, cancel recording and change
the settings or thresholds. (If too many events are occurring, you can increase the thresholds based on
measurement results.)
• Continue recording for the necessary period, check the state of the power supply malfunction based on
the detected events, and take corrective action as appropriate. (The PW3198 can be used not only for
the investigation phase, but also to verify the effectiveness of corrective action taken.)
What type of investigation (measurement) should be performed to find the cause?
(It is recommended to measure voltage, current, and possibly power continuously. By analyzing voltage and
current trends when the issue occurs, it will be easier to pinpoint the cause of the problem. Additionally,
simultaneously measuring multiple locations is an effective way to quickly identify the cause.)
• Electrical substation internal lines (power companies only)
• High or low voltage at a service line entrance
• Distribution boards and switchboards
• Outlets and other points of power supply for electric and electronic equipment
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What is the expected cause?
• Voltage abnormalities (RMS value fluctuations, waveform distortion, transient voltages, high-order har-
monics [noise at frequencies of several kilohertz and above])
• Current abnormalities (leak current, inrush current)
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Step 3: Checking investigation (measurement) locations (collecting site data)
Step 4: Making measurements with the power supply quality analyzer

Hioki PW3198 Specifications

General

Brand	Hioki
Model	PW3198
Category	Measuring Instruments
Language	English