In the industrial sector, the choice of current transformer is crucial when it comes to guaranteeing the reliability of current measurements. Current sensors and transformers play an essential role in the measurement, protection and control of electrical installations by enabling high currents to be converted into safe, measurable values.
At Socomec, we provide our customers not only with solutions, but also with advice and expertise, in addition to technology. To help our customers choose the right current transformers or sensors, we have compiled this article which outlines the basic criteria to consider when making your selection, as well as some expert advice.
Why choose a custom-made current transformer?
Custom-made current transformers are perfect for new builds, but especially for retrofit projects. They are particularly useful for existing installations where they can be integrated to improve performance and efficiency without the need for major modifications. They offer unrivalled flexibility and ensure optimum compatibility with existing equipment. This customization is particularly advantageous for OEMs, as it allows them to meet their exact technical and performance requirements while optimising costs.
In summary, customized current transformers are a strategic solution for OEMs, providing them with tailor-made, high performance devices capable of meeting the current and future challenges of industrial applications.
3 basic criteria to consider
1- Select a suitable measurement range
It's important to choose a measurement range that covers all the potential currents within your installation, without sacrificing accuracy or reliability. An appropriate measuring range allows the transformer to operate efficiently under a variety of conditions, without the risk of saturation or failure. Check that the transformer can handle both low and high currents in order to ensure accurate measurements across all applications.
2- Choose the accuracy level that meets your needs
Accuracy class is essential in order to ensure accurate measurements. As customers' needs vary, it is crucial to choose a transformer that offers the accuracy required for your specific applications, not just the highest. Choose a product that offers a wide range of accuracy levels and can meet a variety of applications..
3- Ease of installation for current transformers (CTs)
For existing applications, the compactness of current transformers can make for a greatly simplified installation process, without interrupting operation. Also, check whether your manufacturer offers fixing and wiring options that will save you time. For example, ACCUline current transformers are ultra-compact and can be easily installed in any existing electrical configuration..
Before finalizing your choice, it's also important to consider the possibility of prototyping and testing your concept. This preliminary development phase enables the design to be refined and validated before mass production, guaranteeing perfect integration and optimum performance in your installations.
From prototyping to customizing
A prototype enables you to test quickly and cost-effectively whether the sensor or current transformer meets expectations in terms of accuracy, size and performance.
"The initial design can always be optimized. By making a prototype, the teams can identify aspects of the design that can be improved, such as dimensions, number of turns, cable length, and so on," explains Loïc Reitter.
Prototyping is also a way of iterating quickly on improved versions while speeding up the development process. Testing before mass production is crucial, because discovering errors during the prototyping phase is significantly less costly than correcting these problems after mass production, saving time and money in the long term.
Our expert advice for making the best choice of CT
Understand your needs
Understanding the intended use of the transformer and sensor will help you determine the features you need, such as the current range to be measured, the accuracy required and the environment in which it will be used.
Take accuracy into account
The ability of the transformer and sensor to measure current accurately is essential, especially in billing applications where precise measurements are required.
"Make sure that the accuracy of the transformer matches your measurement requirements," advises Loïc Reitter.
Check compatibility with the internal and external environment
"Make sure that the transformer is compatible with the rest of your system and that it fits properly into your installation, whether by way of plate mounting, Din rail or busbar. Check that the nominal voltage and other electrical characteristics of the transformer are compatible with those of the system into which it will be integrated," recommends Loïc Reitter.
By following these basic criteria, you can select the current transformer best suited to your specific needs, ensuring the reliability, precision and efficiency of your electrical installations. At Socomec, we're here to support you every step of the way.
