Wire Wye, 3-Element with 3 PTs and 3 CTs | Electro-Voice 250, 1252

0.25 A

INPUT

Figure 4.3: 4-Wire Wye, 3-Element with 3 PTs and 3 CTs

Electro Industries/GaugeTech Doc # E107706 V1.25

4-6

Image 52

Electro-Voice 250, 1252 operation manual Wire Wye, 3-Element with 3 PTs and 3 CTs

Contents

Nexus 1250 /1252 Electro Industries/GaugeTech Doc # E107706 Nexus 1250/1252 Revision Customer Service and Support Product WarrantyLimitation of Warranty Statement of Calibration About Electro Industries/GaugeTech ApplicationsFutura+ Series Products DM Series Products Electro Industries/GaugeTech Doc # E107706 Table of Contents Communication Wiring Using the Nexus External DisplaysTransformer Loss Compensation Nexus Time-of-Use Nexus External I/O Modules Nexus Monitor with INP2 Internal Modem OptionNexus Monitor with Internal Network Option Flicker Glossary of Terms Three-Phase System Configurations Chapter Three-Phase Power MeasurementWye 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 Nexus 1250/1252 Power Quality Monitoring DNP V3.00 Level 1 and LevelFlicker 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 Power Watts per phase Apparent Power VA per phaseReactive Power VAR per phase Power Watts Total Apparent Power VA Total Reactive Power VAR TotalPower Factor PF Phase Angles Total Harmonic Distortion %THDWatt hour Wh 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 RS-485 wiring with a Modem Manager. See section Remote Communication OverviewRemote Connection-RS-232 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 Selected Modem Strings Modem String/SettingHigh Speed Inputs Connection Five Modes of Time Synchronization Installation IRIG-B Connections Electro Industries/GaugeTech Doc # E107706 Mode Button LED Display Up/Down Arrows Nexus P40N Modes Connect Multiple DisplaysP41N Dynamic Readings Mode Electro Industries/GaugeTech Doc # E107706 Navigational Map of Dynamic Readings Mode Group 1 Device Time Nexus Information ModeGroup 4 External Display Units Navigational Map of Nexus Information Mode Readings Display Features Mode Group 1 Reset Max/MinGroup 2 Reset Energy Group 8 Display Scroll ON/OFF Navigational Map of Display Features Mode Nexus P60N Touch Screen External Display General Groups of Readings Reset Button View LimitsGeneral page Overview of Real Time Readings Volts Voltage Readings Details Volts Voltage Readings PH-NVolts Voltage Readings PH-PH Amps Current Readings Details Real Time Power Real Time Power Readings Details Demand Power Demand Power Readings DetailsAmps Current Readings A-B-C Energy Accumulated Energy Information TOU Register Demand TOU AccumulationsTouch Short Term or Long Term to view other Flicker screens Phasors Phasor Analysis Limits Limit StatusWaveform 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 Base Conversion Factors Meter/Installation DataLoad Loss at Transformer Normalize Losses to Meter Base Loss Watts Percentage Values Calculate Load Loss Values Chapter Nexus Time-of-Use Nexus TOU Calendar Updating, Retrieving and Replacing TOU Calendars TOU Prior Season and MonthDaylight 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 Instantaneous Flicker Evaluation Short Term Flicker EvaluationLong Term Flicker Evaluation Summary Measurement Procedure SetupData available Software User Interface Main screen Time StatusFrequency Flicker Monitoring Short Term Readings Pst Readings DisplayedLong Term Readings Plt Readings Displayed Polling LoggingLog 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