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Fluke 1775 Manual

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Users Manual
54
Transients. Transient overvoltages are either non-oscillatory (impulsive) or oscillatory signals
on mains caused by lightning strikes, switching of heavy loads, such as motors, welders, power
factor correction banks, or switching of overcurrent protection devices.
Transient overvoltage can cause damage to the insulation of motors, transformers, and
electronic equipment. Depending on the overvoltage category, peak values can occur, see
Table 1 4 .
Measurement modes:
PQ Meter
PQ Logger
Parameters to configure:
Trigger on/off
Sample rate 1 MS/s or 20 MS/s
On the Fluke 1777, use 1 MS/s if the subsequent waveform after the event up to 0.5 s is of
interest.
Note
The use of 1 MS/s impacts the accuracy of the peak measurement.
Table 14. Transient Voltages
Voltage Line-to-Neutral and Line-to-Ground >100
≤150V
>150V
≤300V
>300V
≤600V
>600V
≤1000V
CAT II Single-phase receptacle
connected loads
• Appliance, portable tools, and other
household and similar loads
• Outlet and long branch circuits
• Outlets at more than 10 meters
(30 feet) from CAT III source
• Outlets at more that 20 meters
(60 feet) from CAT IV source
1500 V 2500 V 4000 V 6000 V
CAT III
Three-phase distribution,
including single-phase
commercial lighting
• Equipment in fixed installations, such
as switchgear and polyphase motors
• Bus and feeder in industrial plants
• Feeders and short branch circuits,
distribution panel devices
• Lighting systems in larger buildings
• Appliance outlets with short
connections to service entrance
2500 V 4000 V 6000 V 8000 V
CAT IV
Three-phase at utility
connection, any outdoor
conductors
• Refers to the “origin of installation,”
for example, where low-voltage
connection is made to utility power
• Electricity meters, primary
overcurrent protection equipment
• Outside and service entrance, service
drop from pole to building, run
between meter and panel
• Overhead line to detached building,
underground line to well pump
4000 V 6000 V 8000 V
12 000 V
(not
supported)
… 60


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