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Měřící Energetické Aparáty, a.s.

Měřící Energetické Aparáty, a.s. Joint measurement of energy quantity and energy quality in distribution substations. www.e-mega.cz. Měřící Energetické Aparáty, a.s. Measurement of voltage quality in electricity meter Technicaly possible Price of realisation ?

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Měřící Energetické Aparáty, a.s.

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  1. Měřící Energetické Aparáty, a.s. Joint measurement ofenergyquantityandenergyquality in distributionsubstations www.e-mega.cz

  2. Měřící Energetické Aparáty, a.s. • Measurementofvoltagequality • in electricity meter • Technicalypossible • Priceofrealisation? • Interrestofcustommers? • Feasibilityistimeandfinancialydemanding • Contributionfordistributioncompanies? • Contributionfor society? www.e-mega.cz

  3. Měřící Energetické Aparáty, a.s. • Measurementofenergyquantityandquality • Energy meters are set gauges, measuring functions are stable and consistent • The meter is perceived by society as an unchanging, certified deviceandeven technically well-meaning development can lead to discussion and consequently to distrust • Power Quality Measurement currently goes through a dynamic development • Implementation in the new networks and • in already constructed and operated networks • Unificationofstandards • Timefactor: price + performance ↔ time www.e-mega.cz

  4. Měřící Energetické Aparáty, a.s. www.e-mega.cz

  5. Měřící Energetické Aparáty, a.s. • Questionsfordecisionabout joint measurement • ofelectricenergyquantityandquality • Delivery point formeasurementofqualityofelectricenergyis point • in public distribution network, whereenergyisexchangedbetweencontractingparties. • This point may vary from point ofmeasurementofelectricenergyquantity • Class A – forcontractingrelationships • ClassS – forstatisticalevaluation (twotendenciesofmeasuringmethods) www.e-mega.cz

  6. Měřící Energetické Aparáty, a.s. • Linearity rangeofvoltagemeasurementcircuits: 1.75 UNOM • classS – 3rdtestingstate1.52UNOM, 20% harmonics, 0.723% flicker, 1% interharmonics • Evaluation period: • energyquantity/15min • quality/10minaggregation • Data transfer security: • energyquantity/billing • quality/informative www.e-mega.cz

  7. Měřící Energetické Aparáty, a.s. • Continuousphenomena • (flagged 10 minuteevaluations) • Frequencyevaluation, 10s averagevalueofharmonics basic component • Flickerevaluation, forchanges ∆U/U from 1change/min.upto 4000 ch./min. • Voltageunbalance • Harmonicanalysis, frequencyofcalculation (10 periods/1s, withoutgaps) • Voltagephenomena • (URMS1or URMS1/2, hysteresis, clusteringalgorithms) • Forflagging • Securedpowersupply (measurementuncertainity 1% Unomand 20ms during 1 minute) www.e-mega.cz

  8. Měřící Energetické Aparáty, a.s. • Expecteddevelopment in votagequalitymeasurement • Changesofindicativevalues ​​forvoltageandcontinuousphenomena • Rapid voltagechanges • Recordof RMS values • Oscilographicrecord • Phaseangleduringinceptionof rapid change • Shortchangeofvoltageunbalance • Phaseshiftcaused by rapid change • Measurementofharmonicsandinterharmonics (40. H, 50.H, 100.H) • Transientvoltage www.e-mega.cz

  9. Měřící Energetické Aparáty, a.s. • Conclusions • Intended association of operational measurements and the measurement • of quantity and quality of el. energy is in place • The solution can only be assessed on the basis of operational experience • Verification of measurement in substations which is easily accessible is offering • It is needed to respect different meanings of measurement in substation • and on interface between distribution and custommer • Other solutions in case of already constructed and operated networks • and another in new networks or in networks with a refurbished power equipment www.e-mega.cz

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