Schneider Electric PM5300 Displaying harmonics data, Viewing harmonics using the front panel

Page 90

Chapter 11—Power quality	PowerLogic™ PM5300 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 3-11,13-21, or 23-31to view the graphs for the 3rd to 11th, 13th to 21st, or
	23rd to 31st harmonics, respectively. For example, to display the 13th to 21st
	harmonics screen, press 13-21.

90	© 2014 Schneider Electric All Rights Reserved

Image 90

Contents PowerLogic PM5300 Series Power and Energy Meter Page Important Information Please notePage Introduction Chapter Safety Precau Tions EnceHardware Refer Chapter Power quality Chapter AlarmsChapter Multi-tariff feature Chapter Input / OutputUpgrades Chapter Meter resetsChapter Maintenance Chapter Verifying accuraPowerLogic PM5300 series user guide Box Contents Power and Energy Meter HardwareParts and Accessories IntroductionPowerLogic PM5300 user guide Safety Precautions Before You BeginPowerLogic PM5300 series user guide PM5300 Series Models, Features and Options Models, Features and OptionsFunctions and Characteristics Functions and CharacteristicsDemand Values Power Quality MeasurementsEnergy Values Other MeasurementsTechnical Specifications Electrical CharacteristicsSafety Mechanical CharacteristicsEnvironmental Characteristics Electromagnetic CompatibilitySafety precautions DimensionHuman Machine Interface Meter mounting Mounting the PM5300Meter wiring Serial No Description Specification Screw driver type M3Recommended cables Make Part code DescriptionWiring Diagrams Current Transformer Voltage disconnect switch Power systemSymbol Description Direct connect voltage limitsPower system setup parameters Power system description Meter settingSymbol Current input protection Voltage and current input wiringVoltage input protection Direct connect maximumBalanced system considerations Control power wiringCommunications Serial communicationsRS-485 cable RS-485 wiringRS-485 network configuration RS-485 maximum cable lengthDigital outputs Ethernet configurationEthernet wiring EthernetETHERNET SwitchSWITCH/ hub/ HUB Ethernet communicationsDigital output connections Status inputsRelay outputs Status input connectionsRelay output connections Alarm / energy pulsing LED modes Front panel display and meter setupLED indicators Heartbeat / communications LEDNotification icons Meter screen menusRelated topics Menu tree PM5300 display screen menusConfiguring the basic setup parameters Front panel meter setupMeter setup screen navigation Basic setup screenBasic setup menu tree Basic setup parametersParameter Values Description Serial communications setup menu tree Communications setupSetting up serial communications Communication portsSetting up Ethernet communications Communications setup parametersEthernet communications setup menu tree Ethernet port settings HMI settingsSetting up the display Display setup menu treeDisplay setup parameters Setting up the screen passwordsSetting up regional settings Regional settings menu treeLost password Password setup menu treePassword setup parameters Clock setup parameters Setting the clock Advanced setupClock setup menu tree Advanced setup menu treeAlarm / energy pulsing LED settings menu tree Setting up the alarm / energy pulsing LEDAdvanced setup parameters LED setup parameterInput / output setup Demand setup Demand setup menu treePower or current demand setup parameters Multi-tariff setup Alarms setupRemote Meter Setup Meter data display screens Viewing Meter DataViewing meter data from the front panel Displaying data screensHarm Power PQSVolts U-V Energy EUnbal AlarmHz F MnMxTimer Using ION Setup to view or modify configuration dataUsing software to view meter data MaintInput / Output Status input applicationsStatus Input, Digital Output Ports and Relay Output Ports Navigate to I/O configuration I/O Setup Status input setupConfiguring status inputs using ION Setup Status input setup parameters available through ION SetupConfiguring status inputs using the front panel Status input setup menu treeDigital output applications Digital output setupDigital output wiring example Digital output application exampleConfiguring digital outputs using ION Setup Digital output setup parameters available through ION SetupConfiguring digital outputs using the front panel Digital output setup menu treeOn Time s This defines the pulse width on time in seconds Parameter Values Description Relay output setup parameters available through ION Setup Relay output setupConfiguring relay outputs using ION Setup Relay output applicationsSet to External or Alarm. The relay output Configuring relay outputs using the front panel Relay output setup menu treeAlarm / energy pulsing LED setup Navigate to I/O configuration Energy Pulsing Disabled turns off the LED completely Alarms About AlarmsSecond Alarms List of Standard 1-Second Over/Under Alarms AlarmDigital Alarms How the power meter handles setpoint-driven alarmsAlarm Priorities Alarm SetupUnary Alarms Using an Alarm to Control a Relay and Digital OutputSetting Up 1-Second Alarms Setting Up 1-Second Alarms Setting Up Unary Alarms Setting Up Digital Alarms Setting Up Digital Alarms Viewing Alarm Activity and History Viewing Active Alarms and Alarm CountersViewing Unacknowledged Alarms and the Alarm History Log PowerLogic PM5300 series user guide Alarms Data Logs Data LogsDescription Number of Registers Data Type Register Number Alarm Log Alarm Log StorageMemory Allocation for Log Files Real-time readings Power factorMeasurements and calculations EnergyIEC mode Power factor min/max conventionPower factor sign convention Power factor minimum and maximumDemand Power demand calculation methodsIeee mode Block interval demandSynchronized demand Block interval demand exampleThermal demand Current demandPredicted demand Thermal demand examplePeak demand Predicted demand exampleMulti-tariff feature Multi-tariff feature exampleMulti-tariff feature overview Time format Command mode overviewTime of day mode overview Front panel date and time formatTariff creation method Example tariff configurations for a four-tariff systemConfiguration 1 four tariffs with weekdays and weekends Tariff Type Start date End date Start time End timeConfiguration 2 2 tariff assignment using 2 digital inputs Input mode overviewConfiguration 1 2 tariff assignment using 2 digital inputs1 Digital input requirements for required number of tariffs Tariff setup menu tree Configuring tariffs using the front panel Configuring time of day mode tariffs using the front panel Time of day mode tariff setupConfiguring input mode tariffs using the front panel Harmonics overview Power qualityHarmonic content calculations Total Harmonic Distortion and Total Demand DistortionTHD and thd calculations Viewing harmonics using the front panelDisplaying harmonics data TDD calculationViewing TDD Viewing THD/thd using the front panelPower Quality display screen Example 13th to 21st harmonics for line-to-neutral voltageRelated topics Testing overview Verifying accuracyAccuracy test requirements Location of energy pulsing LED Reference device or energy standardEnergy pulsing PM5300Verifying accuracy test Calculating total power Percent error calculationCalculating the number of required pulses Energy pulsing considerations Total power limit for alarm / energy LEDTotal power limit for digital output VT and CT considerationsWatt-hour test points example Typical sources of test errorsTest points Var-hour test points exampleGlobal resets Meter resetsFront panel meter reset screens Reset menu treeAlarm counter options Single resetsSingle reset options Alarm counter Option DescriptionPowerLogic PM5300 series user guideChapter 13-Meter resets 102 Power Meter Memory Maintenance and UpgradesPassword Recovery Identifying the Firmware Version, Model, and Serial NumberDownloading Firmware Control PowerAdditional Meter Status Information MeterTroubleshooting Heartbeat/Comms LED105 Getting Technical Support Register List TroubleshootingPotential Problem Possible Cause Possible Solution 106MID overview Specifications relevant to MIDMID Compliance MID compliance for the meterInstallation and wiring MID ComplianceDefault PM5331/PM5341 display screen Installing the terminal coversPM5331/PM5341 default screen Location of terminal coversLock-protected setup parameters MID-protected setup parametersLock-protected setup parameters Meter firmware versionSetting up the PM5331/PM5341 Initializing the meterSetting up lock password Navigate to Maint Setup Meter LockLocking or unlocking the meter Glossary Terms113 114 Abbreviations 115116 117 118 Page Schneider Electric 35, rue Joseph Monier CS