Photovoltaic systems, heat pumps, and electric vehicle charging stations generate high currents that standard measuring devices can't handle. This is where current transformer measurement comes into play, offering a practical solution for accurate high-current measurement. In this article, we’ll explore what current transformer measurement is and the products in the Krannich portfolio designed for this purpose.
Current transformer measurement, often referred to as CT measurement, is a method used in electrical systems to indirectly measure high currents that standard measuring devices cannot handle. This technique employs current transformers (CT) and voltage transformers (VT) to reduce high currents and voltages to a measurable level.
An electrically charged line generates a magnetic field. In current transformers, this magnetic field induces a "secondary current," which is significantly smaller than the primary current. This reduction is determined by a fixed multiple, known as the transformation ratio. The measuring device captures this smaller secondary current and, using the transformation ratio, calculates the original primary current.
An example:
This indirect measurement method allows for precise monitoring of high-current systems, ensuring safety and accuracy in various applications such as photovoltaic systems, heat pumps, and electric vehicle charging stations. The simplicity and reliability of current transformer measurement make it a widely used solution in managing electrical loads.
Accurate measurement using suitable transformers is important for several reasons:
In der Bezeichnung der CTs kann erkannt werden, für welche Stromstärke der Messwandler maximal zugelassen ist. Dieser Wert sollte nicht überschritten werden, da die Messergebnisse sonst ungenau werden.
Current transformer measurement is particularly useful for:
There are three types of current transformer meters that can be used for current transformer measurement:
Current transformer measurement is necessary when:
The costs for a current transformer measurement can vary widely based on several factors:
The total cost for a complete current transformer measurement setup and installation can amount to several thousand euros.
Permissible measurement deviations in current transformer measurements are defined by standards and regulations. Typically:
Accuracy depends on the class of the transformers and must meet application-specific requirements.
Various types of meters can be used for current transformer measurements, including:
In conclusion, current transformer measurement is essential for accurately monitoring and managing high-current electrical systems. By choosing the right products and understanding their application, businesses can ensure precise billing, effective load management, and enhanced safety.