Power quality measurement with the electricity meter model

Power quality measurement with the electricity meter, model LZQJ-XC Autor : Ing. František Horváth , Šp. Mlyn 18. 4. 2013

LZQJ-XC – Description Electricity meter versions Voltage Ranges: 3 x 58/100 V; 3 x 63/110 V Q-LED 3 x 230/400 V; 3 x 240/415 V 3 x 290/500 V; 3 x 400/690 V 3 x 100 V Aron (3 -wire versions) Broad range inputs Suitable for FVE (fotovoltaic power generation sources) from 58/100 V to 240/415 V Current Through MT x/1 A : 1 A; 1(2) ; 1(6)A; 5 II 1 A - universal; Through MT x/5 A: 5 A; 5(10)A; Direct measurement: 5(100)A; 5(60)A; 10(100)A; 10(60)A; Frequency: 50 Hz; 60 Hz; 16 2/3 Hz Parameterisation button P-LED Optical sensor Electric cell – reading in voltagefree state Communication module Variability of modules: PSTN GSM GPRS Ethernet 2 nd interface RS 485

Model LZQJ-XC – not only a four-quadrant device LZQJ-XC: a four-quadrant + Actual values in the servicing table TS per phases, measuring period 1 s: U, I, P, Q, S, P/S, f Work registers P+, P-, Q+, QQ 1 , Q 2, Q 3, Q 4 Profiles P. 01 /P 15/ P. 02 /P 10/ Monitoring of grid quality parameters – EN 50 160 Harmonic analysis U, I after 31 st Measurement of losses in distribution transformers /Rfe, Rcu/ Registration of Imax within overall measurement in transforming stations Registration of rapid voltage fluctuations with time resolution in ms Registers of events in logbooks – e. g. voltage dumps, tampering, . . .

Power quality measurement with the electricity meter LZQJ-XC Evaluation complies with the standard EN 50160 Source: measured values in P. 02 with MP 10 min /LP 10/ Model LZQJ XC meets the requirements for Q-meters of the Class B, the newest model NXT 4 meets the requirements of the Class S Evaluations in the electricity meter LZQJ-XC : Checks of non-exceeding of limit values Extended records in the electricity meter: Profile P. 130 , LP 1440 – register C. 88 - exceeding of limits for P. 02 : U, THD, Pst, f Visualisation on PC Evaluation of measured values by EMH software – focused on non-exceeding of limit values

Measured quantities in the profiles P. 01 and P. 02 basis for the grid quality measurement: exact values Measured values in P. 01 with the measuring period 15 min. /LP 15/ : P, Q, S, D up to 32 channels Measured values in P. 02 with the measuring period 10 min. /LP 10/ : P, Q Uavg (L 1, L 2, L 3) Umax (L 1, L 2, L 3) Umin (L 1, L 2, L 3) Iavg (L 1, L 2, L 3) Imax (L 1, L 2, L 3) Total Harmonic Distortion THD U (L 1, L 2, L 3) THD I (L 1, L 2, L 3): It exceeds even the requirements of EN 50 160 ! Flicker (L 1, L 2, L 3) Frequency Other channels: - Register for checks of installation C. 86. 0 /up to 60/ - Register for checks of voltage C. 86. 1 - Channels for the registration of individual harmonics in the grid

Configuration for grid quality monitoring Register checks of voltage C. 86. 1 Optional setting of parameters for quality monitoring: 2 independent bands for U, f and limits of THD U, Pst Register C. 86. 1

Power quality measurement with the electricity meter LZQJ-XC Register C. 86. 1() = register for voltage monitoring (EN 50160) Monitoring of two frequency bands (10 s average values) Monitoring of two voltage bands (10 min average values P. 02) THD U (10 min average values P. 02) Short-term flicker Pst (10 min average values P. 02) Record of exceeded limit value in P. 211, with time stamp Register C. 88. xx = Register of events – total of exceeding cases / decrease of monitored U, THD, f, Pavg - for a long-term monitoring C. 88. 96() registers completely checked 10 -second average values C. 88. 97() registers completely checked 10 -minute average values C. 88. 98() time stamp for start time

Evaluation of quality measurement data Evaluation of long-term monitoring of U, f, Pst and THD from P. 02 Register C. 88. XX – Number of over- / under- passing of defined limit values - % of measured values which did not exceed a set limit Profile P. 130, LP 1440 – Register C. 88

Power quality measurement with the electricity meter LZQJ-XC EN 50160 IEC 61000 -4 -xx (EMC) register kvality napätia (C. 86. 1) Vyhodnotenie nameraných hodnôt s hranicami podľa EN 50160 v elektromere Počty prekročení nastavených hraníc (C. 88. xx) • Presné merané hodnoty Zaznamenávanie prekročení • Vyhodnotenie cez SW hraníc s časovou pečiatkou (P. 211) Dlhodobé zaznamenávanie Denný profil (P. 130) Užívateľský profil (P. 02)

Principles of harmonic analysis Harmonic voltages 95% of 10 -min average effective values of voltage of each harmonics must not exceed specified values in any weekly period – the standard stipulates after 25 th , in LZQJ XC until 31 st Total harmonic distortion THD must not be greater than 8%

Evaluation of harmonics in LZQJ – XC Example of representation of harmonics with evaluation of limit values: LZQJ XC evaluates even harmonics in current

History of phase voltages – Record in LZQJ – XC Fast voltage fluctuations Raster in ms , Window -0. 3 to +1 sec from the event Optional analysis of short-term dumps on the level of ms

Measurement of actual values in LZQJ-XC Measured values in the service table of TS – period of measurement 1 s: P per phases and the sum Q per phases and the sum S per phases and the sum P/S (PF) per phases and the sum I (L 1, L 2, L 3) U (L 1, L 2, L 3) f - Frequency In combination with “Loger XC” it is possible to read and store actual values in a 6 -sec raster on SD card

Accurate measuring system – essential element of the electricity meter LZQJ-XC Due to an accurate compensated current converter at the input and due to a strong measurement processor: LZQJ-XC works in the Accuracy class 0. 2 S U 8 k. V 6 k. V t LZQJ-XC is protected by robust input circuits - it is suitable for FVE

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THANK YOU FOR YOUR ATTENTION M +421 905 488 042 E f. horvath@schrack. sk