LPW-305 Power quality analyzer

Power quality analyzer
  • Mass production, always available in stock
  • Much more cheaper than analogues
  • Complies with IEC 61000-4-30:2008 (class A)
  • Energy audit reports according to ЕN 50160:2010

Power quality analyzer is designed for monitoring and control of electric power quality (PQ) parameters in accordance with IEC 61000-4-30:2008 (class A) and ЕN 50160:2010. 

It is supplied with PQ monitor-recorder software LPW-Studio for Windows and Linux.

All modifications of the device have three interfaces for integration into the automated systems of control and accounting of energy resources: Fast Ethernet (100 Mbit/s), RS-485, RS-232.

The power supply is from 85 V to 600 V, it is possible to work even in case of failures in the network.


Sphere of application:

  • Monitoring of power quality (PQ) parameters at industry and housing
  • Easy integration into SCADA systems
  • Continuous monitoring of PQ parameters at the enterprise as well as remote sites (substations, workshops, settlements, etc.)
  • Certification of electric energy, energy inspection, energy audit
  • Emergency replacement of electricity meters
  • Diagnostics of complex equipment failures
  • Protection of expensive equipment
  • Determination of the consumer responsible for PQ degradation
Measurement capabilities
Monitoring of power quality (PQ) parameters Real time measurement of all electric power quality parameters through three voltage channels and three current channels with transmission via Ethernet, RS-485 or RS-232 interfaces.
Energy audit Measurement with preservation in the non-volatile memory of all the main parameters of electrical energy through three voltage channels and three current channels. The device allows you to register all electric power quality parameters for the subsequent generation of a report in accordance with IEC 61000-4-30:2008 (class A) and ЕN 50160:2010 for up to 100 days in an autonomous mode, which makes it possible to use the devices for a 7-day energy audit.
Waveform registration Multiple saves of 20 periods in the nonvolatile memory of the device (2048 samples) of the fundamental frequency with a sampling rate of 200 μs both on request and on the occurrence of a given event with preservation of the prehistory.
Common parameters
Power supply

Rated voltage: ~220 V, 50 Hz
Remains operable in the range of:
- alternating voltage from 85 V to 600 V,
- constant voltage from 120 V to 600 V
It is possible to supply both from one of the phases of measured voltage, and from an individual line.
A wide range of permissible supply voltages ensures the operability of the device even in emergency situations in electric networks.

Electromagnetic compatibility National standarts Р 51522-99 (МЭК 61326-1-97), Р 51317.6.5
Interfaces RS-232, RS-485 and Fast Ethernet (100 Mbps), MODBUS software protocol
Compliance with IEC PQ parameters measurement in accordance with IEC 61000-4-30:2008 (class A)
Measurement of harmonics 50 harmonics via voltage and current measurement channels
Operating temperature range From -25 to +60 °С
Power consumption Not more than 20 W
Dimensions Not more than 170x155x82 mm
Weight Not more than 1 kg
Life time Not less than 10 years
Real-time clock Built-in
Modification Opto-isolator pulse output Resistive load of RS-485 communication interface line

Discrete opto-isolated input

2GB MicroSD memory card
LPW-305-4 No No No Yes
LPW-305-5 Yes Yes No Yes
LPW-305-6 Yes No Yes Yes


LPW-305 application assumes the use of external current transformers (CT), and when connected to a line with a voltage of more than 0.4 kV - the use of external voltage transformers (VT). From a technical point of view, you can use any certified CTs and VTs that are suitable for your task in the input nominal current range of CT, input nominal voltage range of VT, and having an output nominal range:

  • 1 A or 5 A for CTs with the appropriate selection of the current measuring range in LPW-305.
  • From 57 V to 0.4 kV for VTs, depending on the connection scheme of VT to LPW-305 and the selection of the voltage measurement range in LPW-305.

Typical cases are the use of CTs and VTs with an accuracy class of 0.5S or 0.2S.

As a current transformer it is possible to use current clamp (CC) with current output. In this case, all the specified requirements for CTs also apply to the CCs.

For further information about the application of LPW-305, see the Manual.

  • LPW-305-4
    with microSD, no relay and no discrete input
  • LPW-305-5
    with relay and microSD, no discrete input
  • LPW-305-6
    with relay, discrete input and microSD


  • re_lpw305_en.pdf (filesize: 2 261 921 bytes, date: 27.02.2018)

    LPW305. User manual.


Phone: +7 (495) 785-95-19
Fax: +7 (495) 785-95-14

Sales department: en@lcard.ru
Technical support: en@lcard.ru

5 Varshavskoye shosse, corp. 4, build. 2
Moscow 117105
Russian Federation

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