High-precision mains frequency measurement for primary reserve and smart-grid applications

The FRQ310 is a device for measuring the power grid frequency in a number of different applications. It provides a resolution of +/1mHz which makes it particularly suitable for grid frequency measurements in the field of primary control reserve (FFR firm frequency response / dynamic containment). But it will suit perfectly as well in other smart grid and power applications such as substations, small and decentral generating units or virtual power plants.

With its compact dimensions, the frequency measurement card will fit even in smaller housings or control boxes. The device is connected to the grid with two terminals (phase and neutral). The integrated GPS module allows timestamping of the frequency data.

A LED scale at the front shows the deviation from the nominal frequency within a range of +/- 200mHz.

The FRQ310 comes in 2 versions:

Version 1 (extension card):
The frequency measurement is delivered as an extension or the @120 PLC automation system from OHP.

Version 2 (stand-alone, Modbus RTU):
The frequency measurement card comes as stand-alone device. It provides a serial port (Modbus RTU) to connect to any PLC or remote control system.

Further Information

Präzisions-Netzfrequenzmessung mit sicherer Datenübertragung für Primärregelleistung und Netzfrequenzüberwachung (GER)

März 16th, 2020|

Zum Artikel

Netzfrequenzmessgerät FRQ310
(Version 1)
Internal supply
5 VDC, max. 135mA, typ. 120mA
(Version 2)
External supply
24 VDC, max. 135mA, typ. 120mA
Measurement signal 90..230VAC
Range 45..65Hz
Adjustable nominal frequency 50Hz / 60 Hz
Precision +/- 1 mHz
Resolution 0,1mHz
Measurement period 100ms/1s
Timesync GPS
Fuse 100mA träge intern OHP Empfehlung – externe Sicherung 50mA flink
(Version 1)
Internal bus
Parallel I/O bus
(Version 2)
Serial port
Mechanical specifications
Dimensions 132x115x40mm (height x depth x width)
Weight ca. 240g
Versorgung 11-pole terminal 1/3 C30M
Anlagenbus TNC (f) on top
Environmental conditions
Norms VDE 0160, UL 508
Temperature -25..+85°C
Power consumption Typ. 800mW (600mW DC + 200mW AC)

Digital system solutions for infrastructure and industry

About OHP
OHP GmbH from Rodgau is a system supplier for automation, telecontrol and control technology. We offer our customers products and services for the fields of infrastructure, energy and industrial plants, relying on integrated system technology and open communication standards for safe and economical long-term operation.

Experience and quality since 1989
The employees of OHP combine the know-how of nearly 30 years. Emerging from an AEG development department, we are one of the few companies that can rely on an in-house developed product portfolio ranging from telecontrol/automation devices to open communication technology and control systems with additional packages.
OHP stands for investment protection and innovative system solutions as well as customized engineering and service for the benefit of our customers. OHP has been working according to recognized quality standards for years and is certified according to ISO 27001:2017, ISO 9001:2015, SCC occupational health and safety and other standards.

System solutions for a digital infrastructure

  • Control technology and station control technology for energy, water, wastewater, infrastructure and industry
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  • Telecontrol and automation technology
  • Communication technology from modem modules to protocol converters with powerful communication functions
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  • Railroad technology from stationary current monitoring to automation of rail vehicles
  • Turnkey systems from planning and execution to training and support
  • Electronics / software development / manufacturing for OEM assemblies

Are you interested in OHP’s high-precision power frequency meter?

Your contact person:

Dr.-Ing. Thorsten Fiedler

OHP Automation Systems GmbH
Gutenbergstr. 16
63110 Rodgau / Germany
Phone.: +49 6106-84955-0

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