PLA34RG power quality analyser cl. S
A power quality analyser designed according the norm EN 61000-4-30 class S with three voltage and four current inputs for measurement of electrical parameters in LV and MV systems. PLA34RG is built on a 32 bit RISC processor that provides sufficient processing capabilities for real-time measurement and calculation of all parameters and values. Continuous sampling of the voltage and current inputs at 40 kHz guarantees the highest accuracy. The PLA34RG is an instrument for power quality monitoring according to the norm EN 50160.
- sampling frequency 40 kHz
- current sensing via Rogowski coils
- U 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, interharmonics EN 61000-4-7 up to 64th
- filcker measurement according EN 61000-4-1
- suitable for PQ reports EN 50160
- transient detection > 25 μs events detection > 10 ms
- avg, max, min recorded value
- EN 50160, 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
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.
Digital integrator
Digital integrator for current range change is integrated inside the instrument PLA34RG. Internal digital integraters offers the following measuring current ranges 10 A, 30 A, 100 A, 300 A, 1 kA, 3 kA, 10 kA.
Modbus gateway
Thanks to the built-in Modbus TCP/IP converter it is possible use the PLA34RG as an Ethernet - Modbus gateway for the connection of instruments with RS485 interfaces and Modbus RTU protocols.
Events
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.
Software
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 transfered 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 |  |
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10...600 V | 1 V...1 MV | 0.2% | |||||
| line-line voltage | |
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18...1000 V | 0...1 MV | 0.2% | |||||
| system frequency | |
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40...70 Hz | 40...70 Hz | 10 mHz | |||||||
| current | |
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0.001...8.5 A | 1 mA...1 MA | 1% | ||||
| CosΦ | |
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0.01L...0.01C | 0.01L...0.01C | 1% | |||||||
| Power factor | |
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0.01L...0.01C | 0.01L...0.01C | 1% | ||||||
| THDU L-N | |
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0...999% | 0...999% | 5% | |||||
| THDU L-L | |
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0...999% | 0...999% | 5% | |||||
| THDI | |
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0...999% | 0...999% | 5% | ||||
| U harmonics | |
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0...999% | 0...999% | class 1 | ||||||||
| group of U interharmonics | |
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0...999% | 0...999% | class 1 | ||||||||
| group of U harmonics | |
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0...999% | 0...999% | class 1 | ||||||||
| P harmonics | |
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0...999% | 0...999% | class 1 | ||||||||
| Q harmonics | |
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0...999% | 0...999% | class 1 | ||||||||
| I harmonics | |
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0...999% | 0...999% | class 1 | |||||||
| group of I interharmonics | |
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0...999% | 0...999% | class 1 | |||||||
| group of I harmonics | |
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0...999% | 0...999% | class 1 | |||||||
| short-term flicker | |
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0.4...10.0 | 0.4...10.0 | class A | |||||||
| long-term flicker | |
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0.4...10.0 | 0.4...10.0 | class A | |||||||
| under-voltage | |
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0...100% | 0...100% | 0.4% | ||
| over-voltage | |
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0...100% | 0...100% | 0.4% | ||
| asymmetry of voltage | |
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0...100% | 0...100% | 0.3% | ||||||||
| N wire voltage | |
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10...600 V | 0...1 MV | 0.2% | ||||||||
| K-factor | |
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| asymmetry of current | |
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0.5% | ||||||||||
| PQ transients | |
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25 μs | ||||||||||
| PQ events | |
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10 ms | |||||||||
| ripple control | |
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| active power | |
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0...15.3 kW | 0...9999 GW | 1% | |||||
| reactive power | |
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0...15.3 kvar | 0...9999 Gvar | 1% | |||||
| apparent power | |
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0...15.3 kVA | 0...9999 GVA | 1% | |||||
| distortion power | |
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1% | |||||||
| active energy +/- | |
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0...9999 GWh | 0...9999 GWh | class 1 | |||||||
| reactive L energy +/- | |
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0...9999 Gvarh | 0...9999 Gvarh | class 2 | |||||||
| reactive C energy +/- | |
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0...9999 Gvarh | 0...9999 Gvarh | class 2 |
Technical features
| Parameetr | 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 |
| event detection | 40 kHz |
| Detekce událostí | > 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 |
