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Chapter 1: Three-Phase Power Measurement
1.1: Three-Phase System Configurations . . . . . . . . . . . . . . . . . . . . . 1-1
1.1.1: Wye Connnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1.2: Delta Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.1.3: Blondell’s Theorem and Three Phase Measurement . . . . . . . . . . . . . 1-4
1.2: Power, Energy and Demand . . . . . . . . . . . . . . . . . . . . . . . . 1-6
1.3: Reactive Energy and Power Factor . . . . . . . . . . . . . . . . . . . . . 1-8
1.4: Harmonic Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
1.5: Power Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Chapter 2: Nexus Overview
2.1: The Nexus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2: DNP V3.00 Level 1 and Level 2 . . . . . . . . . . . . . . . . . . . . . . 2-2
2.3: Flicker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.4: INP2 Internal Modem with Dial-In/Dial-Out Option . . . . . . . . . . . . . . 2-3
2.4.1: Hardware Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.4.2: Dial-In Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.4.3: Dial-Out Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.5: Total Web Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.5.1: Hardware Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.5.2: Hardware Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.6: Measurements and Calculations . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.7: Demand Integrators . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.8: Nexus External I/O Modules (Optional) . . . . . . . . . . . . . . . . . . . 2-12
2.9: Nexus 1250/1252 Meter Specifications . . . . . . . . . . . . . . . . . . . 2-13
2.10: Nexus P40N, P41N, P43N External Display Specifications . . . . . . . . . . 2-14
2.11: Nexus P60N Touch Screen Display Specifications . . . . . . . . . . . . . . 2-14
Chapter 3: Hardware Installation
3.1: Mounting the Nexus 1259/1252 Meter . . . . . . . . . . . . . . . . . . . . 3-1
3.2: Mounting the Nexus P40N, P41N, P43N External Displays . . . . . . . . . . . 3-3
3.3: Mounting the Nexus P60N Touch Screen External Display . . . . . . . . . . . 3-4
3.4: Mounting the Nexus External I/O Modules . . . . . . . . . . . . . . . . . . 3-6
Chapter 4: Electrical Installation
4.1: Wiring the Monitored Inputs and Voltages . . . . . . . . . . . . . . . . . . 4-1
4.2: Fusing the Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.3: Wiring the Monitored Inputs -VRef . . . . . . . . . . . . . . . . . . . . . 4-1
4.4: Wiring the Monitored Inputs - VAux . . . . . . . . . . . . . . . . . . . . . 4-1
4.5: Wiring the Monitored Inputs - Currents . . . . . . . . . . . . . . . . . . . 4-1
4.6: Isolating a CT Connection Reversal . . . . . . . . . . . . . . . . . . . . . 4-2
4.7: Instrument Power Connections . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.8: Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Electro Industries/GaugeTech
Doc # E107706 V1.25 v