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PQMII POWER QUALITY METER – INSTRUCTION MANUAL
CHAPTER 2: INSTALLATION
2.2.3
3-wire System using Two CTs
The figure below shows two methods for connecting CTs to the PQMII for a 3-wire system.
The top drawing shows the standard wiring configuration using three CTs. An alternate
wiring configuration uses only two CTs. With the two CT method, the third phase is
measured by connecting the commons from phase A and C to the phase B input on the
PQMII. This causes the phase A and phase C current to flow through the PQMII’s phase B CT
in the opposite direction, producing a current equal to the actual phase B current.
Ia + Ib + Ic = 0 for a three wire system.
Ib = – (Ia + Ic)
For the CT connections above, the
S2 SYSTEM SETUP
ÖØ
CURRENT/VOLTAGE CONFIGURATION
ÖØ
PHASE CT WIRING
ÖØ
PHASE CT PRIMARY
setpoint must be set to PHASE A, B, AND C.
FIGURE 2–9: Alternate CT Connections for 3-wire System
Содержание PQM II
Страница 8: ...TOC VI PQMII POWER QUALITY METER INSTRUCTION MANUAL TABLE OF CONTENTS ...
Страница 12: ...1 4 PQMII POWER QUALITY METER INSTRUCTION MANUAL CHAPTER 1 OVERVIEW FIGURE 1 2 Feature Highlights ...
Страница 19: ...CHAPTER 1 OVERVIEW PQMII POWER QUALITY METER INSTRUCTION MANUAL 1 11 FIGURE 1 9 Trace Memory Capture ...
Страница 58: ...3 10 PQMII POWER QUALITY METER INSTRUCTION MANUAL CHAPTER 3 OPERATION ...
Страница 78: ...4 20 PQMII POWER QUALITY METER INSTRUCTION MANUAL CHAPTER 4 SOFTWARE FIGURE 4 6 Voltage Disturbance Recorder ...
Страница 84: ...4 26 PQMII POWER QUALITY METER INSTRUCTION MANUAL CHAPTER 4 SOFTWARE ...
Страница 170: ...6 32 PQMII POWER QUALITY METER INSTRUCTION MANUAL CHAPTER 6 MONITORING ...
Страница 196: ...7 26 PQMII POWER QUALITY METER INSTRUCTION MANUAL CHAPTER 7 APPLICATIONS ...
Страница 198: ...8 2 PQMII POWER QUALITY METER INSTRUCTION MANUAL CHAPTER 8 WARRANTY ...
Страница 208: ...A 10 PQMII POWER QUALITY METER INSTRUCTION MANUAL APPENDIX A ...
Страница 216: ...B VIII PQM POWER QUALITY METER INSTRUCTION MANUAL CHAPTER B INDEX ...