Table of Contents

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

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Electro-Voice 1252, 250 operation manual Table of Contents