Typical Application: Instrument Transformer
Switzerland is also home to Pfiffner Messwandler AG, in Hirschthal. This mid-sized company is a reputable maker of voltage and current converters for all voltage levels used in power transmission and distribution. These devices – small, specialty transformers – are capable of converting high voltages or currents to a measurable level so that they can be automatically further processed by electronic control devices.
This is necessary for two reasons. First, every power producer, every grid operator and every energy provider wants to know exactly how much electrical energy has been transported – even if it is only for billing purposes. The transformers employed for this must meet high accuracy specifications. Second, transformers are essential for protecting the grids. They are designed to detect any over-voltages or short-circuit currents, and the evaluation electronics are programmed to issue a signal to shut down the affected grid section as necessary. Instrument transformers are therefore vital elements of power transmission and distribution, and hundreds of thousands of them are used around the world – they can be found in the terminals of every cable, from power plants through to substations.