LPW-305-7 Power quality analyzer

Power quality analyzer
  • Mass production, always abailable 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. 

The device is an edition of LPW-305 designed for installation in places where visual reading of information is impossible or impractical. The obtained information is transmitted over the Ethernet network (Fast Ethernet 100 Mbps, MODBUS) to the top-level system. It is supplied with PQ monitor-recorder software LPW-Studio for Windows and Linux.

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

The delivery set includes current-collecting clamps for 500 A.


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 Fast Ethernet (100 Mbps).
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.
Access to PQ parameters via Internet The received information is transmitted over the Ethernet network to the top-level system and can be displayed on the computer screen, tablet, smartphone or other device.
Common parameter
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 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 5 W
Dimensions Not more than 205x10x65 mm
Weight 0,7±0,2 kg
Life time Not less than 10 years
Real-time clock Built-in
GPS-receiver for synchronization with external antenna (option) Built-in


LPW-305-7 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-305-7.
  • From 57 V to 0.4 kV for VTs, depending on the connection scheme of VT to LPW-305-7 and the selection of the voltage measurement range in LPW-305-7.

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.

  • LPW-305-7
    Ethernet interface, current-collecting clamps for 500 A


  • 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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