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
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
Q-LED
P-LED
Parameterisation button
Optical sensor
Electric cell –
reading in voltagefree state
Communication
module
Variability of modules:
PSTN
GSM
GPRS
Ethernet
2nd interface RS485
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+, QQ1 , 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 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 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
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 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- / underpassing 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 25th , in LZQJ XC until 31st
Total harmonic distortion THD must not be greater than 8%
Grenzwerte der Harmonischen nach DIN EN 50160
[%Un]
100
10
1
0,1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
[h]
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 (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
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
U
8 kV
6 kV
t
LZQJ-XC is protected by robust
input circuits - it is suitable for FVE
Blackout -Rozpad siete 4.11.2006
Vergleich der Netzfrequenz im Verbundnetz
Porovnanie
sieťovej frekvencie
50,5
50,4
Wittenburg
Slowakei
f in Hz
50,3
50,2
50,1
50
49,9
0:00:00
2:24:00
4:48:00
7:12:00
9:36:00
12:00:00
Uhrzeit
14:24:00
16:48:00
19:12:00
21:36:00
0:00:00
THANK YOU FOR YOUR ATTENTION
M +421 905 488 042
E f.horvath@schrack.sk