Name: Power quality analyzer
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PQM-750

Index: WMGBPQM750AC1R1CT5

Power quality analyzer

Description

Technical specification

Standard accessories

Files

Description
Stationary, modular, comprehensive

Stationary meter designed to measure and record power supply parameters for compliance with standards and applicable laws, and with the ability to verify preset terms of a power sale/purchase contract.

Made in class A. Designed to be mounted on a DIN rail (with the possibility of mounting on a wall in a cabinet). Modular design allows adding new modules to expand the capabilities of the meter. The instrument allows measurements in 50 Hz, 60 Hz and 400 Hz* networks.

* coming soon
Features
Full class A according to IEC 61000-4-30, confirmed by a certificate from an accredited laboratory

Voltage inputs L1, L2, L3, N, E (5 terminals)

L1, L2, L3, N, E currents (5 current transformers)

Built-in current transformers 5 A (optional: 1 A*), possibility of indirect measurements with calculation results for the primary side (optional: version with external current transformers*)

Operation in 50 Hz, 60 Hz networks, operation in 400 Hz networks*

Recording of voltage and current events along with waveforms

Measurement of more than 4,000 parameters

24-bit analog-to-digital converter

Basic sampling rate of 80 kHz

Conducted emissions monitoring in the 2…150 kHz band

Two LAN ports, including one with the option of powering the meter with PoE (Power over Ethernet)

Power supply 85…264 V AC (120…300 V DC), built-in rechargeable battery

8 GB memory (microSD card)

USB port for meter updates and data exchange

Two binary inputs, two relay outputs, two RS-485 ports

Relay output to monitoring analyzer operation (Watchdog)

1-wire input for external temperature sensors

2.4” touch screen

DIN rail or wall mounting

Expansion bus allowing connection of various external modules (e.g. GPS, LTE)

Built-in web server for programming the meter, reading current data, viewing the list of recorded events with oscillogram/RMS display

Time synchronization with the reference via NTP servers, IRIG-B (via built-in RS-485)

Optional GPS module*

Measurement category CAT III 600 V (IV 300 V) for voltage inputs

Measurement category CAT III 300 V for current inputs

Possibility of sealing current and voltage inputs

* coming soon
Additional features
Standard transmission protocols

Modbus TCP/IP

Modbus RTU

IEC 61850

PQdif

Web interface (webserver)

Access to the interface from any web browser
Modularity
The instrument can be expanded with additional communication protocols and physical and software functionality.

Additional internal modules*

Transient module

SSR relay module

18…60 V DC power supply unit

Additional external modules*

LTE GSM module

GPS module with IRIG-B output

I/O module

LCD 7” touch panel for full operation of the analyzer at the mounting location

* coming soon
Measured parameters
Built-in software (web interface – webserver) allows you to configure the device and view actual data. It allows measurement of the following parameters.

Phase RMS voltage U for L1, L2, L3+N/PE

Phase-to-phase RMS voltages U for L12, L23, L31

RMS currents I of all phases + N + PE

Crest factor CF of voltages and currents

Network frequency f for L1

Active power P for L1, L2, L3

Active power P1 (separated 50 Hz) for L1, L2, L3

Reactive power Q for L1, L2, L3

Reactive power Q1 (separated 50 Hz) for L1, L2, L3

Apparent power S for L1, L2, L3

Apparent power S1 (separated 50 Hz) for L1, L2, L3

Three-phase total power P_3F, Q_3F, S_3F

Three-phase total power P1_3F, Q1_3F, S1_3F

cosφ for L1, L2, L3, cosφ_3F

Power factor PF for L1, L2, L3, PF_3F

tgφ for L1, L2, L3, tgφ_3F

Distortion power D for L1, L2, L3

Three-phase total distortion power D_3F

Distortion power factor DPF for L1, L2, L3

Shape of phase voltages and currents for events

Phase diagrams for currents and voltages

Active energy for L1, L2, L3 – taken E_P+ or given E_P-.

Three-phase active energy – drawn E_P3F+ or given E_P3F-

Inductive reactive energy for L1, L2, L3 for consumption – E_QL+

Capacitive reactive energy for L1, L2, L3 for consumption – E_QC+

Three-phase reactive energy for consumption – inductive E_QL3F+ and capacitive E_QC3F+

Apparent energy for L1, L2, L3 – E_S

Three-phase apparent energy E_S3F

Harmonics h_n to 256^th in current and voltage

Interharmonics up to 256th in current and voltage

Angles between current and voltage harmonics

Monitoring of 2…150 kHz bandwidth

U_DC phase voltage components

Shares of harmonic currents and voltages in relation to RMS value (%) – h_nR

Shares of harmonic currents and voltages in relation to the fundamental harmonic h1 (%) – h_nF

THD_R for voltages and currents calculated against RMS value (%)

THD_F for voltages and currents calculated relative to the fundamental harmonic (%)

TID_R for voltages and currents calculated against RMS value (%)

TID_F for voltages and currents calculated relative to the fundamental harmonic (%)

Active and reactive harmonic powers

K-factor for I₁, I₂, I₃, I_N

Factor K (Europe)

Symmetrical voltage components: zero U₀, direct U₁, inverse U₂

Voltage values (V, %) of harmonic components of the order compatible (1, 4, 7,…), opposite (2, 5, 8,…), zero (3, 6, 9,…)

Symmetrical components of current: zero I₀, direct I₁, inverse I₂

Values of currents (A, %) of harmonic components of the order direct (1, 4, 7,…), inverse (2, 5, 8,…), zero (3, 6, 9,…)

Short-term light flicker factor P_st

Long-term light flicker factor P_lt

Voltage unbalance

Current unbalance

Transients U up to 6000 V

Ripple control signals

Temperatures: Tw (analyzer internals), Tz1…Tz4 (1-wire)
Standards
Made in class A of the IEC 61000-4-30 standard, the instrument is compliant:

Product standards:

IEC 62586-1 – Power quality measurement in power supply systems – Part 1: Power quality instruments (PQI)

IEC 62586-2 – Power quality measurement in power supply systems – Part 2: Functional tests and uncertainty requirements

Standards for measuring network parameters:

IEC 61000-4-30 – Electromagnetic compatibility (EMC) – Testing and measurement techniques – Power quality measurement methods

IEC 61000-4-7 – Electromagnetic compatibility (EMC) – Testing and Measurement Techniques – General Guide on Harmonics and Interharmonics Measurements and Instrumentation for Power Supply Systems and Equipment Connected thereto

IEC 61000-4-15 – Electromagnetic compatibility (EMC) – Testing and Measurement Techniques – Flickermeter – Functional and Design Specifications

EN 50160 – Voltage characteristics of electricity supplied by public electricity networks

Safety standards:

IEC 61010-1 – Safety requirements for electrical equipment for measurement control and laboratory use. Part 1: General requirements

IEC 61010-2-030 – Safety requirements for electrical equipment for measurement, control, and laboratory use – Part 2-030: Particular requirements for equipment having testing or measuring circuits

Standards for electromagnetic compatibility:

EN 55032 – Electromagnetic compatibility of multimedia equipment – Emission Requirements

IEC 61000-6-5 – Electromagnetic compatibility (EMC) – Part 6-5: Generic standards – Immunity for equipment used in power station and substation environment

Technical specification

Parameters

Parameter	Measuring range	Max. resolution	Accuracy
Alternating voltage (TRMS) U_{L-L MAX} = 2000 V for U_{L-E MAX} = 1000 V	0.0…1000.0 V	4 significant digits	±0.1% U_din
Crest Factor
Voltage	1.0…6.5 (1.65 for voltage of 690 V)	0.01	±5%
Current	1.00…10.00	0.01	±5%
Alternating current (TRMS)	0…20 A	4 significant digits	±0.2%
Frequency	40.000…70.000 Hz	0.001 Hz	±0.01 Hz
Active power IEC 62053-22 class 0,2S	depending on voltage and current ratio	4 significant digits	±0.2%
Reactive power IEC 62053-24 class 0,5S	depending on voltage and current ratio	4 significant digits	±0.5%
Apparent power	depending on voltage and current ratio	4 significant digits	±0.2%
Active energy IEC 62053-22 class 0,2S	depending on voltage and current ratio	4 significant digits	±0.2%
Reactive energy IEC 62053-24 class 0,5S	depending on voltage and current ratio	4 significant digits	±0.5%
Apparent energy	depending on voltage and current ratio	4 significant digits	±0.2%
cosφ and power factor (PF)	-1.000…1.000	0.001	0.05
tanφ	-10.000…10.000	0.001	depends on error of active and reactive power
Harmonics and interharmonics
Voltage	DC, 0…256	4 significant digits	±0.05% U_din for m.v. < 1% U_din ±5% m.v. for m.v. ≥ 1% U_din
Current	0…256	4 significant digits	±0.15% I_rin for m.v. < 3% I_rin ±5% m.v. for m.v. ≥ 3% I_rin
THD-F
Voltage	0…20%	0.01%	±0.3% (absolute error)
Current	0…100%	0.01%	±0.3% (absolute error)
Active and reactive power of harmonics	depending on voltage and current ratio	4 significant digits	—
Angle between current and voltage harmonics	-180.0…+180.0°	0.1°	≤0.05° for n = 1 ≤1° for 2 ≤ n ≤ 60 at f_nom = 50 Hz ≤4° for 61 ≤ n ≤ 256 at f_nom = 50 Hz
K-Factor	1.0…50.0	0.01	±10%
Flicker index	0.20…10.00	0.01	±5%
Unbalance factor
Voltage and current	0.0…20.0%	0.1%	±0.15% (absolute error)
Measurement of control signals
Voltage	up to 15% U_din at f_R = 5…30000 Hz	4 significant digits	unspecified for <1% U_din ±0.15% for 1…3% U_din ±5% for 3…15% U_din
Emissions in band
2…9 kHz	a single frequency that is multiple of 200 Hz	0.01 V	±0.1% U_din for m.v. < 2% U_din ±5% m.v. for m.v. ≥ 2% U_din
8…150 kHz	a single frequency that is multiple of 2 kHz	0.01 V	±(5% + 0.1 V)

m.v. – measured value

Standard accessories
Seal for voltage and current terminals (set of 2 pcs.)WAPOZPLOKPL
Fork terminal for grounding terminalWAZACWID
Wall mounting kitWAPOZUCH17
LAN network cable, shielded, 1.5 mWAPRZRJ451X5EKR
Sonel pendriveWAPOZUSBSTICK
Factory calibration certificateWADOKCK

Files

Datasheet PQM-750 EN
Brief user manual PQM-750 PL+GB+ES+DE
User manual PQM-750 GB
User manual PQM-750 IEC 61850 GB
User manual PQM-750 MODBUS GB
User manual PQM-750 WEBSERVER GB
Declaration of Conformity PQM-750
PQM-750 certificate class A
Power quality - a guide GB

Firmware PQM-750

changelogcomments

Changes in 1.02 version:

Added support for transient module.
Added email notification functionality.
Added support for importing configurations via a USB flash drive.
Added support for 3-phase 3-wire networks with Aron current measurement to the meter.
Improved the process of changing the analyser configuration – recording is restarted only when required (e.g., when

changing measured parameters).
Improved webserver operation.
Improved log saving to USB flash drives.
Updated the bootloader to version 0.12.
Updated the IEC 61850 library to version 631.
Fixed an error where an event lasting several days was repeated every 24 hours in the web server's event table.
Fixed errors when exporting and importing configurations using the web server.
Fixed an error in the connection correctness indicators in 3-phase, 3-wire systems (voltage values and angles).
Improved translations in the webserver.
Improved analyzer stability.

Changes in 1.01 version:

Added feature to generate and upload to FTP server PQDIF files of aggregated data for user recording (max. 100 MB per day).
Added German language in the meter.
Improved meter update via USB flash drive by supporting files with .pqf extension with any name.
Fixed the error of blanking the screen and going to the main menu when updating the meter.
Fixed random bug of restoring part of factory settings after meter firmware update.
Changed Min/Max values for voltages and currents from 10/12-period to RMS1/2.
User data recording has been improved.
Fixed bug causing the meter to loop between two screens.
Fixed bug freezing communication when writing system logs to USB flash drive was in progress.
An error preventing the Slave address for Modbus RTU from being changed to something other than the factory address has been corrected.
Fixed bug with detecting false phase jumps events.
Improved meter stability.
Fixed error of not displaying graphs and not being able to download PQDIF file for phase jump and waveshape variation events.
Fixed bug with missing data in webserver.
A bug in memory circular mode handling causing the meter to hang randomly has been corrected.
Fixed bug in webserver preventing entry of frequency of monitored ripple control signals.
A bug in the web server preventing tan(fi) recording from being enabled has been corrected.
Fixed bug in the web server of missing TID-F coefficients of voltages in 3-phase 3-wire systems.
Improved handling of security certificates in the webserver (no need to log in again).
Translations in the webserver have been improved.
Improved handling of the webserver.

Devices with firmware 1.00 require that, when updating using a USB flash drive, the name of the update file be changed to ‘pqm750-update.pqf’. Other names are not recognised by the device.

PQM-750 Power quality analyzer