Wire, 2-Element Open Delta with 2 PTs, 2 CTs | Electro-Voice 250

0.25 A

Figure 4.5: 3-Wire, 2-Element Open Delta with 2 PTs, 2 CTs.

Electro Industries/GaugeTech Doc # E107706 V1.25

4-8

Image 54

Electro-Voice 250, 1252 operation manual Wire, 2-Element Open Delta with 2 PTs, 2 CTs

Contents

Nexus 1250 /1252 Electro Industries/GaugeTech Doc # E107706 Nexus 1250/1252 Revision Limitation of Warranty Customer Service and SupportProduct Warranty Statement of Calibration Futura+ Series Products About Electro Industries/GaugeTechApplications DM Series Products Electro Industries/GaugeTech Doc # E107706 Table of Contents Transformer Loss Compensation Communication WiringUsing the Nexus External Displays Nexus Time-of-Use Nexus Monitor with Internal Network Option Nexus External I/O ModulesNexus Monitor with INP2 Internal Modem Option Flicker Glossary of Terms Chapter Three-Phase Power Measurement Three-Phase System ConfigurationsWye Connection Phase-to-Ground Voltage Phase-to-Phase Voltage Three-Phase Delta Winding Relationship Delta Connection Blondell’s Theorem and Three Phase Measurement Phase B Phase C Node n Phase a Power, Energy and Demand Power Use Over Time Time Interval Power kW Energy kWh Accumulated Minute Reactive Energy and Power Factor Energy Use and Demand Voltage and Complex Harmonic Distortion 10 Nondistorted Current Waveform 11 Distorted Current Wave Electro Industries/GaugeTech Doc # E107706 Power Quality Cause Disturbance Type Source Electro Industries/GaugeTech Doc # E107706 Chapter Nexus Overview Nexus System Flicker Nexus 1250/1252 Power Quality MonitoringDNP V3.00 Level 1 and Level Nexus 1250/1252 Revenue Metering Dial-In Function Dial-Out Function Total Web Solutions Hardware Connection Enter the Domain Name Server and Computer Name Measurements and Calculations Root Mean Square RMS of Currents n = number of samples Reactive Power VAR per phase Power Watts per phaseApparent Power VA per phase Power Watts Total Reactive Power VAR Total Apparent Power VA TotalPower Factor PF Watt hour Wh Phase AnglesTotal Harmonic Distortion %THD VAR hour VARh Demand Integrators Partial = ∑Value Other I/O Accessories Nexus External I/O Modules Optional Nexus 1250/1252 Meter Specifications Specification Nexus Meter Nexus P40N, P41N, P43N LED External Display Specifications Nexus P60N Touch Screen Display Specifications Chapter Hardware Installation Mounting the Nexus 1250/1252 Meter Nexus Meter Mounting Diagram, Side View Nexus P40N LED External Display Mounting Diagrams Mounting the Nexus LED External Displays Mounting the Nexus P60N Touch Screen External Display Connect to Nexus Cutout for Nexus P60N Touch Screen Display Mounting the Nexus External I/O Modules Nexus I/O Module Communication Ports Nexus I/O Modules Mounting Diagram, Front View Electro Industries/GaugeTech Doc # E107706 Chapter Electrical Installation Instrument Power Connections Isolating a CT Connection Reversal Wiring Diagrams Figure # Description 25 a 25A 4-Wire Wye, 3-Element with 3 PTs and 3 CTs 3-Wire, 2-Element Open Delta with 2 PTs and 3 CTs 3-Wire, 2-Element Open Delta with 2 PTs, 2 CTs 3-Wire, 2-Element Delta Direct Voltage with 3 CTs 3-Phase, 4-Wire Wye, 2.5 Element with 2 PTs, 3 CTs 4-Wire, 3-Element Grounded Delta with 4 CTs G Option Electro Industries/GaugeTech Doc # E107706 Chapter Communication Wiring Communication Overview RJ-11 Communication with Internal Modem Option MODBUS/TCP IRIG-B Nexus RS-485 Wiring Fundamentals with RT Explanation RS-232 Connection-Nexus Meter to a Computer Wire RS-485 Port For All RS-485 Connections Incorrect Connection T Incorrect Connection Star RS-485 Connection-Nexus Meter to a Computer or PLC Using the Unicom Unicom 2500 with Connections Nexus Meter Port Nexus Meter Port Communication Ports on the Nexus I/O Modules 12 Communication Ports on the Nexus I/O Modules 11 RS-485 Connection-Nexus Meter to Nexus I/O Modules 13 Nexus Meter Connected to Nexus I/O Module Steps to Determine Power Needed 13 I/O Modules’ Factory Settings and VA Ratings Linking Multiple Nexus Devices in Series 14 Linking Multiple Nexus Devices in Series Networking Groups of Nexus Meters 15 Networking Groups of Nexus Meters Remote Connection-RS-232 RS-485 wiring with a Modem Manager. See sectionRemote Communication Overview Remote Connection-RS-485 17 Remote Connections with Internal Modem Option RJ-45MODBUS/TCP over Ethernet Remote Communication-RS-232 Remote Communication-RS-485 Programming Modems for Remote Communication Modem String/Setting Selected Modem StringsHigh Speed Inputs Connection Five Modes of Time Synchronization Installation IRIG-B Connections Electro Industries/GaugeTech Doc # E107706 Mode Button LED Display Up/Down Arrows Connect Multiple Displays Nexus P40N ModesP41N Dynamic Readings Mode Electro Industries/GaugeTech Doc # E107706 Navigational Map of Dynamic Readings Mode Nexus Information Mode Group 1 Device TimeGroup 4 External Display Units Navigational Map of Nexus Information Mode Readings Group 2 Reset Energy Display Features ModeGroup 1 Reset Max/Min Group 8 Display Scroll ON/OFF Navigational Map of Display Features Mode General Groups of Readings Reset Button View Limits Nexus P60N Touch Screen External DisplayGeneral page Overview of Real Time Readings Volts Voltage Readings PH-PH Volts Voltage Readings DetailsVolts Voltage Readings PH-N Amps Current Readings Details Amps Current Readings A-B-C Real Time Power Real Time Power Readings DetailsDemand Power Demand Power Readings Details Energy Accumulated Energy Information TOU Accumulations TOU Register DemandTouch Short Term or Long Term to view other Flicker screens Limits Limit Status Phasors Phasor AnalysisWaveform Real Time Graph Real Time Trending Channel Selector Reset Meter Reset Commands LOG Status Logging Statistics Nexus Port Settings Navigational Map for P60N Touch Screen External Display Chapter Transformer Loss Compensation Introduction Electro Industries/GaugeTech Doc # E107706 Nexus 1250/1252 Transformer Loss Compensation Loss Compensation in Three Element Installations Three Element Loss Compensation Worksheet Transformer Data from Transformer Manufacturer’s Test Sheet Meter/Installation Data Base Conversion FactorsLoad Loss at Transformer Normalize Losses to Meter Base Loss Watts Percentage Values Calculate Load Loss Values Chapter Nexus Time-of-Use Nexus TOU Calendar TOU Prior Season and Month Updating, Retrieving and Replacing TOU CalendarsDaylight Savings and Demand Chapter Nexus External I/O Modules I/O Module Components Port Overview Installing Nexus External I/O Modules Nexus Meter Connected to I/O Module Power Source for I/O Modules Psio Power Source Side View Showing Male RS-485 Side Port Using Psio with Multiple I/O Modules Steps for Attaching Multiple I/O Modules Factory Settings and Reset Button Factory Settings Analog Transducer Signal Output Modules Overview Normal Mode Analog Input Modules Normal Mode Digital Dry Contact Relay Output Form C Module Communication Digital Solid State Pulse Output KYZ Module Communication Digital Status Input Module Specifications Chapter Nexus Monitor with Internal Modem Option Nexus with Internal Modem Option 10-2 Chapter Nexus Meter with Internal Network Option 11-1 11-2 11-3 11-4 Chapter Flicker Theory of Operation Long Term Flicker Evaluation Instantaneous Flicker EvaluationShort Term Flicker Evaluation Summary Setup Measurement ProcedureData available Software User Interface Main screen Frequency TimeStatus Flicker Monitoring Long Term Readings Short Term ReadingsPst Readings Displayed Plt Readings Displayed Logging PollingLog Viewer Performance Notes Calculating Values Excel Spreadsheet with Example Numbers Electro Industries/GaugeTech Doc # E107706 Electro Industries/GaugeTech Doc # E107706 Electro Industries/GaugeTech Doc # E107706 Electro Industries/GaugeTech Doc # E107706 Electro Industries/GaugeTech Doc # E107706 Glossary Electro Industries/Gauge Tech Doc # E107706 Glossary-2 Glossary-3 Glossary-4 Glossary-5 Glossary-6