Schneider Electric PM5300 Calculating the number of required pulses, Calculating total power

Page 96

Chapter 12—Verifying accuracy

PowerLogic™ PM5300 series user guide

 

 

6.Depending on the method selected for counting the energy pulses, configure the meter’s alarm / energy LED or one of the digital outputs to perform energy pulsing. Set the meter’s energy pulse constant so it is in sync with the reference test equipment.

7.Perform accuracy verification on the test points. Run each test point for at least 30 seconds to allow the test bench equipment to read an adequate number of pulses. Allow 10 seconds of dwell time between test points.

Calculating the number of required pulses

The reference test equipment typically requires you to specify the number of pulses required for a test duration of “t” seconds.

Use the following formula to calculate the required number of pulses:

 

t

Number of pulses = Ptot × K ×

3600-----------

Where:

Ptot = total instantaneous power in kilowatts (kW)

K = the meter’s pulse constant setting, in pulses per kWh

t = test duration, in seconds (typically greater than 30 seconds)

Calculating total power

The test voltage and current source supplies the same test signals to both the energy reference/standard and the meter under test. Total power is calculated as follows:

For a balanced 3-phase Wye system:

1 kW Ptot = 3 × VLN × I × PF × ------------------

1000 W

NOTE: A balanced 3-phase system assumes the voltage, current and power factor values are the same for all phases.

For a single-phase system:

1 kW Ptot = VLN × I × PF × ------------------

1000 W

Where:

Ptot = total instantaneous power in kilowatts (kW)

VLN = test point line-to-neutral voltage in volts [V]

I = test point current in amps [A]

PF = power factor

The result of the calculation is rounded up to the nearest integer.

Percent error calculation

For every test point:

EM – ES

Energy Error = --------------------- × 100%

ES

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Contents PowerLogic PM5300 Series Power and Energy Meter Page Important Information Please notePage Introduction Chapter Safety Precau Tions EnceHardware Refer Chapter Alarms Chapter Multi-tariff featureChapter Power quality Chapter Input / OutputChapter Meter resets Chapter MaintenanceUpgrades Chapter Verifying accuraPowerLogic PM5300 series user guide Power and Energy Meter Hardware Parts and AccessoriesBox Contents IntroductionPowerLogic PM5300 user guide Safety Precautions Before You BeginPowerLogic PM5300 series user guide Models, Features and Options Functions and CharacteristicsPM5300 Series Models, Features and Options Functions and CharacteristicsPower Quality Measurements Energy ValuesDemand Values Other MeasurementsTechnical Specifications Electrical CharacteristicsMechanical Characteristics Environmental CharacteristicsSafety 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 Power system Symbol DescriptionCurrent Transformer Voltage disconnect switch Direct connect voltage limitsPower system setup parameters Power system description Meter settingSymbol 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 lengthEthernet configuration Ethernet wiring EthernetETHERNET SwitchSWITCH/ hub/ HUBDigital outputs Ethernet communicationsStatus inputs Relay outputsDigital output connections Status input connectionsRelay output connections Front panel display and meter setup LED indicatorsAlarm / energy pulsing LED modes Heartbeat / communications LEDNotification icons Meter screen menusRelated topics Menu tree PM5300 display screen menusFront panel meter setup Meter setup screen navigationConfiguring the basic setup parameters Basic setup screenBasic setup menu tree Basic setup parametersParameter Values Description Communications setup Setting up serial communicationsSerial communications setup menu tree Communication portsSetting up Ethernet communications Communications setup parametersEthernet communications setup menu tree HMI settings Setting up the displayEthernet port settings Display setup menu treeSetting up the screen passwords Setting up regional settingsDisplay setup parameters Regional settings menu treeLost password Password setup menu treePassword setup parameters Setting the clock Advanced setup Clock setup menu treeClock setup parameters Advanced setup menu treeSetting up the alarm / energy pulsing LED Advanced setup parametersAlarm / energy pulsing LED settings menu tree LED setup parameterInput / output setup Demand setup Demand setup menu treePower or current demand setup parameters Multi-tariff setup Alarms setupRemote Meter Setup Viewing Meter Data Viewing meter data from the front panelMeter data display screens Displaying data screensPower PQS Volts U-VHarm Energy EAlarm Hz FUnbal MnMxUsing ION Setup to view or modify configuration data Using software to view meter dataTimer MaintInput / Output Status input applicationsStatus Input, Digital Output Ports and Relay Output Ports Status input setup Configuring status inputs using ION SetupNavigate to I/O configuration I/O Setup Status input setup parameters available through ION SetupConfiguring status inputs using the front panel Status input setup menu treeDigital output setup Digital output wiring exampleDigital output applications 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 Configuring relay outputs using ION SetupRelay output setup parameters available through 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 Setup Unary AlarmsAlarm Priorities 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 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 exampleMulti-tariff feature Multi-tariff feature exampleMulti-tariff feature overview Command mode overview Time of day mode overviewTime format Front panel date and time formatExample tariff configurations for a four-tariff system Configuration 1 four tariffs with weekdays and weekendsTariff creation method Tariff Type Start date End date Start time End timeInput mode overview Configuration 1 2 tariff assignment using 2 digital inputs1Configuration 2 2 tariff assignment using 2 digital inputs Digital input requirements for required number of tariffsConfiguring tariffs using the front panel Configuring time of day mode tariffs using the front panelTariff setup menu tree Time of day mode tariff setupConfiguring input mode tariffs using the front panel Power 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 13th to 21st harmonics for line-to-neutral voltageRelated topics Testing overview Verifying accuracyAccuracy test requirements Reference device or energy standard Energy pulsingLocation of energy pulsing LED PM5300Verifying accuracy test Calculating total power Percent error calculationCalculating the number of required pulses 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 PM5300 series user guideChapter 13-Meter resets 102 Maintenance and Upgrades Password RecoveryPower Meter Memory Identifying the Firmware Version, Model, and Serial NumberControl Power Additional Meter Status InformationDownloading Firmware MeterTroubleshooting Heartbeat/Comms LED105 Troubleshooting Potential Problem Possible Cause Possible SolutionGetting Technical Support Register List 106Specifications relevant to MID MID ComplianceMID overview MID compliance for the meterInstallation and wiring MID ComplianceInstalling the terminal covers PM5331/PM5341 default screenDefault PM5331/PM5341 display screen Location of terminal coversMID-protected setup parameters Lock-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