session 2 – power quality and emc - cired 2/main... · session 2 – power quality and emc ......

Prague, 8-11 June 2009

1Jan Meyer – Germany Session 2 Paper 0677

Automated Test System for Accuracy Verification of Power Quality Measurement Instruments

Session 2 – Power Quality and EMC

Presentation of Paper 0677

J. Meyer, P. Schegner, M. DomagkTechnische Universitaet Dresden; Germany

R. KuntnerOMICRON electronics; Austria

F. Hillenbrandimc Messsysteme GmbH; Germany

Prague, 8-11 June 2009

2Jan Meyer – Germany Session 2 Paper 0677

Classification of voltage quality measurements

Response to customer complaints

Compliance with contractual limits

Assessment of average quality, Benchmarking

Equipment, analysis and instrument accuracy: problem-specific

Equipment, analysis and instrument accuracy:contract-specific

Equipment, analysis and instrument accuracy:

according to standard

Need for periodical verification of instrument accuracy

Few, mobile units Few, fix installed units Many, fix installed unitsMany, fix installed units

Virtually no verification up to now for Type C measurementsIncreasing number of installed units (esp. fix installed/long term)

Increasing importance of accuracy verification issues ?Growthing interest of regulatory authorities in monitoring campaigns

Requirements for accuracy verification in future ?

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3Jan Meyer – Germany Session 2 Paper 0677

Basic idea and advantages of a mobile test system

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4Jan Meyer – Germany Session 2 Paper 0677

IEC standard 61000-4-30

Much more tests are necessary to verify the correct implementation of the methods according to IEC 61000-4-30 completely (classes A and S).

Basic standard: IEC 61000 4-30 Ed.2 (2008-10)

Product standard required(IEC 62586 actual under development in TC85 WG20)

Normative for voltages onlyNo consideration of external measurement transformersDifferent instrument classes A, S, B A: highest requirements on accuracy and comparability S: standard requirements on accuracy and comparability

Specification of 3 testing states for steady-state performance verification

Prague, 8-11 June 2009

5Jan Meyer – Germany Session 2 Paper 0677

Considered Voltage quality parameters (Testing state 3)

power frequency

interharmonics

harmonics

unbalance(u2 = 4,95%)

0 10 20 30 40-150

-100

-50

0

50

100

150

time / ms

L1 L2 L3

supply voltage

flicker

fN = 51HzDetermined by

other parametersPst=4

r=110/min (d=2,9%)

UL1 = 76 Vrms

UL2 = 70 Vrms

UL3 = 64 Vrms

U(7) = 10%.Udin (180°)U(13) = 5%.Udin (0°)U(25) = 5%.Udin (0°)

1%.Udin bei 3,5fnomUdin = 50 Vrms

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6Jan Meyer – Germany Session 2 Paper 0677

Mandatory test procedure according to IEC 61000-4-30

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7Jan Meyer – Germany Session 2 Paper 0677

Requirements and principle method

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8Jan Meyer – Germany Session 2 Paper 0677

Waveform generation in detail

Com

man

d ou

tput

to t

est

gene

rato

r

sign

al g

e-ne

ration

1

activa

tion

of

voltag

e ou

tput

s

mul

tipl

icat

ion

of

sign

als

sign

al g

e-ne

ration

2

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9Jan Meyer – Germany Session 2 Paper 0677

Approach for synchronized output of test sequence

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10Jan Meyer – Germany Session 2 Paper 0677

Example of a test report (graph of 5th voltage harmonic)

0 5 10 15-1

-0.5

0

0.5

1

5th voltage harmonic / V

mea

sure

men

t un

cert

aint

y /

V

testing state 1

testing state 2

testing state 3

not allowed

not allowed

allowed range

Requirements acc. to IEC 61000-4-7 class I

Short test time of 3 minutes for 15 test points (45 measurement values)Simple identifi-cation of different testing states

TEST PASSED

Result for 5th harmonic

Prague, 8-11 June 2009

11Jan Meyer – Germany Session 2 Paper 0677

Conclusions and future work

Implementation of further testing procedures (e.g. for events, harmonic grouping, post-processing, ...) Development of a test database with a standardized interface to extend the system for different instrument types

Fast and easy way for accuracy verification according to the testing states of IEC 61000-4-30Fully automated and not limited to the specified testing states

Still to do:

Already achieved:

Prague, 8-11 June 2009

12Jan Meyer – Germany Session 2 Paper 0677

Thank you for your attention !

I E E HContact details:Jan MeyerTechnische Universität DresdenInstitute of Electrical Power Systems and High Voltage Engenieering01062 Dresden

Tel. 0351-463 35102Fax. 0351-463 37036

E-Mail: jan.meyer@tu-dresden.de