# Our Power Quality Devices: Always ahead of its time!

News in the “Technical Rules for the Assessment of Network Disturbances”

In Germany, Austria, Switzerland and the Czech Republic, the D-A-CH-CZ guideline determines the rules of the connection of customer installations to the public grid regarding the evaluation of currents. The booklet “Technical Rules for the Assessment of Network Disturbances” is published by the international working group EMC & Power Quality (D-A-CH-CZ). In recent years, intensive work has been put to publish a new version. This version is a much more comprehensive guideline and has recently been published and provided with many innovations and detailed specifications.

What impact will the change have on users of A. Eberle’s power quality measurement technology?

While the old version only evaluated odd-numbered current harmonics up to atomic number 25, the new guideline includes the entire frequency range up to 9 kHz.

#### Devices must detect the range of superharmonics from 2 kHz to 9 kHz in conformity with the standard with 200 Hz bands according to EN 61000-4-7.

The maximum permissible supraharmonic currents of a system connected to the mains can be calculated using the following formula. Please note that the formula is to be used for a nominal mains voltage for Un = 400 V. For deviating voltages, linear conversion is possible.

I_{b zul}= \frac{1}{k_{b}}*\frac{3,3*b^{-0,52}*1 A}{(10,25-\frac{9kHz - b}{kHz})* (r+(1-r)*\frac{0,57MVA}{S_{k V}}}

Ibzul
kb
Skv

b
r

Permissible superharmonic current
Resonance factor for the superharmonic with centre frequency b

Short-circuit power
Centre frequency of the frequency band b
Allocation factor

#### The good news for our customers: Nothing will change for them!

As the innovation leader in the field of mobile power quality measuring devices, our measuring technology is always ahead of its time. The mobile PQ boxes, as well as the Power Quality System analyzers PQI-DE and PQI-DA smart, have been meeting these specifications for a long time.

Contact

### You might also be interested in

#### DAKKS Calibration Report: PQI-DE & PQI-DA smart with sensational results

In the DAKKS calibration according to VDE-AR 4110 Annex F, our power quality analyzers PQI-DE & PQI-DA smart have achieved sensational accuracy values.

Mehr erfahren

#### A. Eberle Quarter Highlights – 07/2022

Summer is finally here and before the vacation season begins, we would like to share with you some news from our product groups.

Mehr erfahren

#### PQ-Box Replacement Campaign: New standards require new PQ-Boxes

We at A. Eberle are constantly working to ensure that our Power Quality devices are ahead of their time. To enable all our customers to get access to the PQ-Boxes which fullfill the newest standards, we are offering a trade-in campaign for our PQ-Box 100 power analyzer.

Mehr erfahren

#### A. Eberle Quartal Highlights – 12/2021

Dear Ladies and Gentelemen, In autumn we hoped, that the pandemic would no longer be the dominant topic at the […]

Mehr erfahren

#### Measurement Supervision for PQI-DA smart & PQI-DE now available

Using the measurement supervision, we offer the user the possibility to measure exactly what he needs. Find more information in our blog!

Mehr erfahren

#### End-of-Year-Discount 2021: PQ-Boxes

As usual, we will offer our customers an End-of-Year-Discount for our Power Quality Boxes. Save up to 400€ buying a PQ-Box.

Mehr erfahren