Fluke 1773/BASIC Product Manual - Page 59
Transients., Table 14. Transient Voltages, Parameters to con
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1773/1775/1777 Users Manual 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 14. Table 14. Transient Voltages CAT II CAT III CAT IV Voltage Line-to-Neutral and Line-to-Ground >100 ≤150V 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 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 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 4000 V drop from pole to building, run between meter and panel • Overhead line to detached building, underground line to well pump >150V ≤300V >300V ≤600V 2500 V 4000 V 4000 V 6000 V 6000 V 8000 V >600V ≤1000V 6000 V 8000 V 12 000 V (not supported) 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. 54 MyFlukeStore Shop for Fluke products online at: www. .com 1.888.610.7664