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Power quality measurement with the electricity meter, model LZQJ-XC

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: 3x58/100V; 3x63/110V 3x230/400V; 3x240/415V 3x290/500V; 3x400/690V

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Power quality measurement with the electricity meter, model LZQJ-XC

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  1. Power quality measurement with the electricity meter, model LZQJ-XC Autor : Ing. František Horváth , Šp. Mlyn 18.4.2013

  2. LZQJ-XC – Description Electricity meter versions • Voltage • Ranges: • 3x58/100V; 3x63/110V • 3x230/400V; 3x240/415V • 3x290/500V; 3x400/690V • 3 x 100V Aron (3-wire versions) • Broad range inputs • Suitable for FVE (fotovoltaic power generation sources) • from 58/100V to 240/415V • Current • Through MT x/1 A : 1A; 1(2) ; 1(6)A; 5II1A - 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 Q-LED P-LED Optical sensor Electric cell – reading in voltage-free state Communication module Variability of modules: PSTN GSM GPRS Ethernet 2nd interface RS485

  3. 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+, Q- Q1 , Q2, Q3, Q4 Profiles P.01 /P15/ P.02 /P10/ Monitoring of grid quality parameters – EN 50 160 Harmonic analysis U, I after 31st Measurement of losses in distri-bution transformers /Rfe, Rcu/ Registration of Imax within overall measurement in transforming stations Registers of events in logbooks – e.g. voltage dumps, tampering, ... Registration of rapid voltage fluctuations with time resolution in ms

  4. Power quality measurement with the electricity meter LZQJ-XC • Evaluation complies with the standard EN 50160 • Source: measured values in P.02 with MP 10min /LP10/ • 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

  5. 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. /LP15/ : P, Q, S, D up to 32 channels • Measured values in P.02 with the measuring period 10 min. /LP10/ : • P, Q • Uavg (L1, L2, L3) • Umax (L1, L2, L3) • Umin (L1, L2, L3) • Iavg(L1, L2, L3) • Imax (L1, L2, L3) • Total Harmonic Distortion THD U (L1, L2, L3) • THD I (L1, L2, L3): It exceeds even the requirements of EN 50 160 ! • Flicker (L1, L2, L3) • Frequency • Other channels: - Register for checks of installation C.86.0 • /up to 60/ - Register for checks of voltageC.86.1 • - Channels for the registration of individual harmonics in the grid

  6. Configuration for grid quality monitoring Registerchecks of voltageC.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

  7. 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

  8. 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

  9. 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 • Užívateľský profil • (P.02) • Presné merané hodnoty • Vyhodnotenie cez SW Počty prekročení nastavených hraníc (C.88.xx) Zaznamenávanie prekročení hraníc s časovou pečiatkou (P.211) Dlhodobé zaznamenávanie Denný profil(P.130)

  10. 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 25th , in LZQJ XC until 31st • Total harmonic distortion THD must not be greater than 8%

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

  12. 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

  13. 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 (L1, L2, L3) • U (L1, L2, L3) • f - Frequency In combination with “Loger XC” it is possible to read and store actual values in a 6-sec raster on SD card

  14. U 8 kV 6 kV t 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 0.2S LZQJ-XC is protected by robust input circuits -it is suitable for FVE

  15. Blackout -Rozpad siete 4.11.2006 Porovnanie sieťovej frekvencie

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

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