Dr. Gobmaier GmbH

Precision measuring technology for power engineering

Logo von www.gobmaier.de Logo von www.gobmaier.deMeasurement device for the mainsfrequency micromax-f

Measurement range 45 Hz bis 65 Hz / accuracy ± 1 mHz / resolution 0,1 mHz

Messgeraet zur Netzfrequenzmessung Messgeraet zur Netzfrequenzmessung The measurement device micromax-f enables fast and precise detection of the mains frequency. It is therefore suitable for the provision of primary reserve, for detection of islanded networks, and for the rapid disconnection of consumers (FFR - Firm Frequency Response) as a frequency relay. A high measurement accuracy of ± 1 mHz is achieved by means of a periodic calibration of the time base with a reference time source (temperature-compensated quartz at the micromax-f, GPS time at the micromax-fgps).

The device offers:

  • Measured one second mean values of the mains frequency (synchronous to the GPS time with -fgps) updated each second
  • Moving average of the mains frequency over one second (1000 ms) updated every 10 ms
  • High time resolution measurement with a moving average, where the measurement period equals the update-rate (100 ms, 150 ms and 200 ms). Precision ± 5 mHz.
  • Web server for querying the data via xml, as well as for configuring the device
  • Web-Client for sending the measured values via UDP to another system
  • Modbus / TCP slave for integration into Modbus systems
  • Modbus / RTU via RS485 (only version -f485)
  • Housing for DIN rail mounting

For measurement of the mains frequency with max. ±1 mHz deviation the micromax-f with temperature-compensated resonant circuit is recommended. The micromax-fgps with GPS is synchronized to UTC, which means that the exact time of each measurement is known. Thus, a comparison of the phasor angle at different locations is possible (e.G. Phasor measurement unit, PMU).

The following versions of the measuring instrument are available:

Case and power supply for DIN rail mounting-f-fgps-f485

More information can be found in the datasheet for the micromax-f
(Datenblatt micromax-f deutsch)

Inquiries and orders can be made directly via our contact form.

Recorded frequency data of the mainsfrequency

Recorded and validated readings in one second resolution since July 2011

Design and operation of a multi-year continuous recording of frequency data is cost- and time-intensive. We can significantly reduce the costs of metering stations for the individual thru selling the data to several customers. This way, you get the data you need more conveniently and more quickly than with your own measurement.

For this purpose, four measuring devices in three locations are installed since July 2011 to record the freuquency. So a continuous recording is ensured in the event of power failure at one location or the defect of a power supply unit. The mains frequency is equal in the whole European network (with the exception of slow beat frequencies).

You can download the frequency data of one week to get a impression of the recordings (09.09.2012 to 15.09.2012):

Inquiries and orders can be made directly via our contact form.

Online frequency service

We offer the retrieval of the current mais frequency from our server. To ensure high availability the measurement data from three measuring devices at two locations are used. The data consists of the current mains frequency and the phasor (angle of the voltage at the measuring location compared to an ideal 50 Hz machine).

Measuring and storage unit

The measuring and storage unit consists of a measuring device and a small computer. The computer establishes a network for the measuring device on one of its two network connections. The other network connection is used for the connection to the customer's network. With that the storage of the mesured values gets independent from the customer's network or other servers.

  • Retrieval of the saved measurement data via SFTP
  • Integration of further measurement points possible
  • Forwarding of the measurement data to several receivers via UDP possible
  • DIN rail mounting

Online-Messung der Netzfrequenz Impressum General Data Protection Regulation Deutsch HTML5 by Silvan Zurbrügg / CC BY 1.0