Metering Insights

Energy Saving with Little Helpers?

I recently stumbled over some advertisements related to plug-in or paste devices which are claimed to reduce the electricity bill by an average of 10%.

User Interface Unit Simulator

By now the UIU/CIU short-codes are not unified. We have collected and merged all recent requests.

How Mean is the Value?

CLOU energy meters and test equipment is measuring the true RMS value by waveform sampling. There are other methods, but they are less accurate.

Power Grid Stability and Renewable Energy

With increasing percentage of renewable energy on power generation we will see more disturbances in the grid.

Waveform Sampling for Electrical Measurements

The interactive graphics below shows the impact on sampling rates on different waveforms. The error calculation is based on true-rms for a wave with 360 samples and for training purpose...

The Over- and Under Voltage Disconnection

The phase to neutral supply voltage is controlled by the power generation companies and utilities by using transformers with on-load tap changers. Depending on the region you can find different...

The Over-Current Disconnect Function

Electronic meters with build-in relays can serve for various functionalities. By IEC62052-11 Ed.2 the name for this sort of relays is Supply Control Switch (SCS).

Who pays for the Beep?

Electronic energy meters, especially those with STS payment functions have the ability to give an alarm. Low credit is a typical example.

Load Limiting for Energy Meters

Electronic energy meters with a load switch can be programmed for a maximum load. If a consumer exceeds the limit, he will be disconnected

Selection of Voltage Transformers

Voltage instrument transformers (VT, sometimes also abbreviated with PT) are used on the primary side of medium- and high voltage distribution transformers.

Selection of Current Instrument Transformers

Transformer operated energy meters need instrument transformers to reduce high voltage- and current values to lower quantities for measurement purpose.

Cross-sections for electricity wiring

Each conductor wire has a resistance. Resistance means heat development inside the wire. Technically it's a loss.