Schneider Electric PM5100 Displaying harmonics data, Viewing harmonics using the front panel

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Chapter 9—Power quality	PowerLogic™ PM5100 series user guide

THD and thd calculations

The meter supports two methods of calculating total harmonic distortion: THD and thd.

THD is a quick measure of the total distortion present in a waveform and is the ratio of harmonic content to the fundamental. The meter uses the following equation to calculate THD:

HC

THD = -------- × 100

H1

Where H1 is equal to the fundamental harmonic.

thd is an alternate method for calculating total harmonic distortion. It uses the RMS value for the total harmonic content rather than the fundamental content. The meter uses the following equation to calculate thd:

thd =	HC	× 100
	(H1)2 + (HC)2

TDD calculation

TDD (total demand distortion) evaluates the harmonic currents between an end user and a power source. The harmonic values are based on a point of common coupling (PCC), which is a common point where each user receives power from the power source. The meter uses the following equation to calculate TDD:

TDD = ( (HCIA)2 + (HCIB)2 + (HCIC)2 ) ⁄ (ILoad) × 100

Where ILoad is equal to the maximum demand load on the power system.

Displaying harmonics data

The meter displays the numeric magnitude and angle of the fundamental (first) harmonic.

Viewing harmonics using the front panel

You can view harmonics data using the front panel.

1.	Navigate to Harm. The Harmonics % screen displays, with the following menu
	options:
	Harmonics % display screens

		IEEE mode	IEC mode	Description

		V L-L	U	Line-to-line voltage harmonics data

		V L-N	V	Line-to-neutral voltage harmonics data

		Amps	I	Current harmonics data

		TDD	TDD	Total demand distortion

2.	Press the voltage or current harmonics you want to view. The fundamental (1st)
	harmonic’s numeric magnitudes and angles for all phases are displayed.
3.	Press 3-11or 7-15to view the graphs for the 3rd to 11th or 7th to 15th harmonics,
	respectively. For example, to display the 7th to 15th harmonics screen, press 7-15.

68	© 2014 Schneider Electric All Rights Reserved

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Contents PowerLogic PM5100 Series Power and Energy Meter Page Important Information Please notePage Hardware Refer Introduction Chapter Safety Precau TionsEnce Chapter Alarms Chapter MeasurementsCalculations Chapter MID ComplianceGlossary Table of Contents PowerLogic PM5100 series user guide Power and Energy Meter Hardware Parts and AccessoriesBox Contents IntroductionIntroduction Safety Precautions Before You BeginPowerLogic PM5100 series user guide Models, Features and Options Functions and CharacteristicsPM5100 Series Models, Features and Options Functions and CharacteristicsTechnical Specifications Mechanical Characteristics Environmental CharacteristicsSafety precautions SafetyElectromagnetic Compatibility CommunicationDimension Meter mountingMounting the PM5100 Meter wiring Serial No Description SpecificationRecommended cables Make Part code DescriptionWiring Diagrams 3CT 2CTPower system Symbol DescriptionDirect connect voltage limits Current TransformerSymbol Power system setup parameters Power system descriptionMeter setting Voltage and current input wiring Voltage input protectionCurrent input protection Direct connect maximumControl power wiring CommunicationsBalanced system considerations Serial communicationsRS-485 wiring RS-485 network configurationRS-485 cable RS-485 maximum cable lengthDigital outputs Digital output connectionsPowerLogic PM5100 series user guide Hardware Reference Front panel display and meter setup LED indicatorsAlarm / energy pulsing LED modes Heartbeat / communications LEDRelated topics Notification iconsMeter screen menus Menu tree PM5100 display screen menusFront panel meter setup Meter setup screen navigationConfiguring the basic setup parameters Basic setup screenParameter Values Description Basic setup menu treeBasic setup parameters Communications setup Setting up serial communicationsSerial communications setup menu tree Communications setup parametersHMI settings Setting up the displaySetting up regional settings Display setup menu treeRegional settings setup parameters Setting up the screen passwordsRegional settings menu tree Setting the clock Lost passwordPassword setup menu tree Password setup parametersAdvanced setup Clock setup parametersAdvanced setup menu tree Parameter Format DescriptionSetting up the alarm / energy pulsing LED Advanced setup parametersAlarm / energy pulsing LED settings menu tree LED setup parameterPower or current demand setup parameters Output setup Demand setupDemand setup menu tree Alarms setup Remote Meter SetupFront panel display and meter setup Viewing Meter Data Viewing meter data from the front panelMeter data display screens Displaying data screensPower PQS Volts U-VHarm Energy EAlarm TimerUnbal MnMxClock Using ION Setup to view or modify configuration dataUsing software to view meter data Digital output applications Digital output setupInput / Output Digital output setup menu tree Alarm / energy pulsing LED setupConfiguring digital outputs using the front panel Navigate to I/O configuration Energy Pulsing Input / OutputPowerLogic PM5100 series user guide Second Alarms AlarmsAbout Alarms List of Standard 1-Second Over/Under Alarms AlarmUnary Alarms Alarm PrioritiesAlarm Setup Setting Up 1-Second Alarms Setting Up 1-Second Alarms Viewing Alarm Activity and History Setting Up Unary AlarmsViewing Active Alarms and Alarm Counters Viewing Unacknowledged Alarms and the Alarm History Log PowerLogic PM5100 series user guide Alarms Power factor Measurements and calculationsReal-time readings EnergyPower factor min/max convention Power factor sign conventionIEC mode Power factor minimum and maximumPower demand calculation methods Ieee modeDemand Block interval demandSynchronized demand Block interval demand exampleCurrent demand Predicted demandThermal demand Thermal demand examplePeak demand Predicted demand examplePower quality Harmonic content calculationsHarmonics overview Total Harmonic Distortion and Total Demand DistortionViewing harmonics using the front panel Displaying harmonics dataTHD and thd calculations TDD calculationViewing THD/thd using the front panel Power Quality display screenViewing TDD Example 7th to 15th harmonics for line-to-neutral voltageRelated topics Accuracy test requirements Testing overviewVerifying accuracy Reference device or energy standard Energy pulsingLocation of energy pulsing LED PM5100Verifying accuracy test Calculating the number of required pulses Calculating total powerPercent error calculation Total power limit for alarm / energy LED Total power limit for digital outputEnergy pulsing considerations VT and CT considerationsTypical sources of test errors Test pointsWatt-hour test points example Var-hour test points exampleMeter resets Front panel meter reset screensGlobal resets Reset menu treeSingle resets Single reset optionsAlarm counter options Alarm counter Option DescriptionPowerLogic PM5100 series user guideChapter 11-Meter resets Meter resets Maintenance and Upgrades Password RecoveryPower Meter Memory Identifying the Firmware Version, Model, and Serial NumberControl Power Additional Meter Status InformationDownloading Firmware MeterTroubleshooting Heartbeat/Comms LEDGetting Technical Support Register List TroubleshootingPotential Problem Possible Cause Possible Solution Specifications relevant to MID MID ComplianceMID overview MID compliance for the meterInstallation and wiring MID ComplianceInstalling the terminal covers PM5111 default screenDefault PM5111 display screen Location of terminal coversMID-protected setup parameters Lock-protected setup parametersLock-protected setup parameters Meter firmware versionLocking or unlocking the meter Setting up the PM5111Initializing the meter Setting up lock password Irrecoverable PasswordGlossary TermsPowerLogic PM5100 series user guide Abbreviations PowerLogic PM5100 series user guide Page Schneider Electric 35, rue Joseph Monier CS