Troubleshooting_Guide_for_Wiring_3_Phase_Meters__no_phasor_diagrams,_recommended_for_CM100-200_.pdf

Troubleshooting_Guide_for_Wiring_3_Phase_Meters__no_phasor_diagrams,_recommended_for_CM100-200_.pdf

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1 R Instrument Transformer Wiring Troubleshooting Guide Three Phase Meters Revision 0, Initial Issue, April 26, 1993 CONTENTS I. How to Use This Guide II. Common Problems for 3-Wire and 4-Wire Systems III. 3-Wire System Troubleshooting IV. 4-Wire System Troubleshooting V. Actual Field Examples I. HOW TO USE THIS GUIDE 1. Symptoms listed are "ideal"; some judgment must be exercised. For example, if KW reading is 25 but you know that it should be about 300 KW, go to where this guide lists "KW=0" as one of the symptoms. 2. Section II "Common Problems for 3-Wire and 4-Wire Systems" addresses symptoms and possible causes which occur regardless of system type; this section should be checked first. If the symptoms are more complicated, proceed to Section III for 3-wire systems or Section IV for 4-wire systems as appropriate. 3. Always assume that the problem is in the wiring to the Circuit Monitor; do not assume a defective Circuit Monitor. Experience has shown that this is almost always a good assumption. 4. This guide addresses mostly only a single wiring problem at a time. It is nearly impossible to address all combinations of multiple wiring mistakes or other problems which can occur such as blown PT fuses, missing PT neutral ground connection, etc. 5. When calling in for troubleshooting assistance, it is imperative that all instantaneous Circuit Monitor readings be provided. Specifically, this includes line-to-line voltages, line-to-neutral voltages, phase currents, phase power factors, KW, KVAR, and KVA. Printouts of logged readings or waveform capture data, if available, can be extremely useful as well. What is "Normal"? See the next page.
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