Metering Insights

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.

Electrical Power Supply Systems

Usually the power supply systems are named with single phase, three-phase three wire or three-phase four-wire. The German VDE and the IEC60364-1 have unified the supply systems based on grounding.

Maximum Current for Energy Meters

Energy meters have certain characteristics, including maximum current. It is the basis for all types of meter tests.

The TID Clock is ticking – Historical Context Before the 2024 Rollover

If you are using STS prepayment energy meters you might remember that updates are required for the key management centre (KMC), the security modules and the vending software.

Markings on the Case of Energy Meters

The IEC 62052-11 Edition 2 has introduced some changes for the meter marking and documentation. Today we cover the mandatory content of the nameplate for IEC meters.

Pairing of a User Interface Unit with a Meter

A user interface unit (UIU) is a remote access terminal for STS prepayment meters. The device is placed inside the users premisses while the energy meter is mounted outside and...

Swapping Phase and Neutral

Will an electronic energy meter measure accurate when I invert phase and neutral during installation? This question came up recently.

Ring Wave Immunity Test

The IEC 62052-11 Ed.2 comes with a lot of changes for meter type testing. Another new introduced test for electromagnetic compatibility (EMC) is the ring wave immunity test.