PLA34 power quality analyser cl. S
Power quality analysers is designed according to the norm IEC 61000-4-30 cl. S ed. 3 for continuous measurement of electrical parameters in LV and MV systems for further power quality investigation. The PLA34 is built with a powerful RISC processor that provides sufficient processing capabilities for real-time measurement and calculation of all parameters and values.
- sampling frequency 40 kHz
- U and I accuracy 0.2
- communication interfaces Ethernet, USB, RS485
- communication protocols Modbus RTU, Modbus TCP, SNTP, SMTP, FTP, HTTP, MTP, MQTT
- RS485 Modbus gateway
- 2 x digital I/O
- 3 voltage and 4 current inputs
- measuring according IEC 61000-4-30 ed.3 cl. S
- harmonics, inter-harmonics EN 61000-4-7 up to 64th
- flicker measurement according EN 61000-4-15
- suitable for PQ reports EN 50160
- transient detection > 25 μs
- events detection > 10 ms
- avg, max, min recorded value
- EN50160, PGC PQ logging
- on board logging Flash memory 1GB
- WWW-server and email notification
- DIN rail mounting design
- PMS SW for configuration, monitoring and evaluation
- universal auxiliary supply voltage
- MQTT support
- PQDIF export
Function
Voltage and current signals are digitalized by high class A/D converter and computing with RISC microprocessor. Effective values are computed continuously in 200 ms (10 periods) windows. Independently on this computing is for events detection each 10ms counted efective value of U and I. Another absolutely independent part is transient detection that are directly detected from samples of digitalized U and I.
IEC 61000-4-30 ed.3 cl. S
PQ analyzer PLA34 measures according the standard IEC 61000-4-30 ed. 3 class S. Such type of analyzers are used in applications where there is necessary precise measurement for power quality evaluation according norms EN 50160, EN 61000-4-7 and EN 61000-4-15.
Events
Events are unexpected signal changes with duration from 10ms up to days. In some installations these events can cause material damages and economical lost. Norm EN 50160 defines limits of events and its quantity that can appear in electrical grid during a year. PQA PLA34 evaluates following type of events DIP, INT, SWELL, RVC and I_MAX
Transients
Transients are very short events with duration of us, that can cause instruments failure or even their damage. For detection of transients are used samples of signal that depends on sampling frequency of PQA. As high sampling as shorter transients can be detected. Power quality analyser PLA34 use sampling rate 40 kHz that allows to detect transients longer that 25 μs.
MQTT
integration of this protocol into PLA34 allows implementation of instrument into any SW. Measured data are divided into several topics in which user can chose which one want to receive. Measured data are transferred in file format JSON.
Measured parameters
| Parameter | L1 | L2 | L3 | L4 | L1-2 | L2-3 | L3-1 | ∑L1-L3 | Max | Min | Avg | Range | Display | Accuracy |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| phase voltage |  |
|
|
|
|
|
10...600 V | 1 V...1 MV | 0.2% | |||||
| line-line voltage | |
|
|
|
|
|
18...1000 V | 0...1 MV | 0.2% | |||||
| system frequency | |
|
|
|
40..70 Hz | 40...70 Hz | 10 mHz | |||||||
| current |
|
|
|
|
|
|
|
0.001...8.5 A | 1 mA...1 MA | 0.2% | ||||
| cosΦ | |
|
|
|
0.01L...0.01C | 0.01L...0.01C | 1% | |||||||
| power factor | |
|
|
|
|
0.01L...0.01C | 0.01L...0.01C | 1% | ||||||
| THDU L-N | |
|
|
|
|
|
0...999% | 0...999% | 5% | |||||
| THDU L-L | |
|
|
|
|
|
0...999% | 0...999% | 5% | |||||
| THDI | |
|
|
|
|
|
|
0...999% | 0...999% | 5% | ||||
| U harmonics | |
|
|
0...999% | 0...999% | class 1 | ||||||||
| group of U interharmonics | |
|
|
0...999% | 0...999% | class 1 | ||||||||
| group of U harmonics | |
|
|
0...999% | 0...999% | class 1 | ||||||||
| P harmonics | |
|
|
0...999% | 0...999% | class 1 | ||||||||
| Q harmonics | |
|
|
0...999% | 0...999% | class 1 | ||||||||
| I harmonics | |
|
|
|
0...999% | 0...999% | class 1 | |||||||
| group of I interharmonics | |
|
|
|
0...999% | 0...999% | class 1 | |||||||
| group of I harmonics | |
|
|
|
0...999% | 0...999% | class 1 | |||||||
| short-term flicker | |
|
|
|
0.4...10.0 | 0.4...10.0 | class A | |||||||
| long-term flicker | |
|
|
|
0.4...10.0 | 0.4...10.0 | class A | |||||||
| under-voltage | |
|
|
|
|
|
|
|
|
0...100% | 0...100% | 0.4% | ||
| over-voltage | |
|
|
|
|
|
|
|
|
0...100% | 0...100% | 0.4% | ||
| asymmetry of voltage | |
|
|
0...100% | 0...100% | 0.3% | ||||||||
| N wire voltage | |
|
|
10...600 V | 0...1 MV | 0.2% | ||||||||
| K-factor | |
|
|
|||||||||||
| asymmetry of current | |
|
|
0.5% | ||||||||||
| PQ transients | |
|
|
25 μs | ||||||||||
| PQ events | |
|
|
|
10 ms | |||||||||
| ripple control | |
|
|
|
|
|
|
|
|
|||||
| active power | |
|
|
|
|
|
0...15.3 kW | 0...9999 GW | 0.4% | |||||
| reactive power | |
|
|
|
|
|
0...15.3 kvar | 0...9999 Gvar | 0.4% | |||||
| apparent power | |
|
|
|
|
|
0...15.3 kVA | 0...9999 GVA | 0.4% | |||||
| distortion power | |
|
|
|
|
|
0.5% | |||||||
| active energy +/- | |
|
|
|
0...9999 GWh | 0...9999 GWh | class 1 | |||||||
| reactive L energy +/- | |
|
|
|
0...9999 Gvarh | 0...9999 Gvarh | class 2 | |||||||
| reactive C energy +/- | |
|
|
|
0...9999 Gvarh | 0...9999 Gvarh | class 2 |
Technical features
| Parameter | Value |
|---|---|
| auxiliary supply voltage | 85 ... 250 VAC/DC (±10%) or 24 ... 60 VAC/DC (±10%) |
| self consumption | < 5 VA |
| time uncertinity | < 1 s a day |
| number of I/O | 2 |
| VT and CT ratio | 1...750 000 |
| sampling rate | 40 kHz |
| event detection | > 10 ms |
| transient detection | > 25 μs |
| logger memory | 1 GB flash |
| display | LCD |
| communication interfaces | RS485 / LAN / USB |
| communication protocols | Modbus RTU, Modbus TCP, SNTP, SMTP, HTTP, FTP, MTP, MQTT |
| ambient temperature | -25°C...+70°C |
| dimensions | 96 x 96 x 60 mm |
| weight | 300 g |
| protection degree | IP20 rear side / IP54 front panel |
| related standards | EN 61000-4-30 class A / EN 61000-4-7 / EN 61000-4-15 class A / EN 61557-12 |
