EUROLAB, with its state-of-the-art accredited laboratories and expert team, offers precise and rapid testing services within the scope of IEC EN 61869-4 testing. IEC EN 61869-4 is valid for newly manufactured combination transformers for use with electrical measuring equipment and electrical protective devices at frequencies between 15 Hz and 100 Hz.
The requirements and tests of this standard cover current and inductive voltage transformers required for combined instrument transformers, in addition to the requirements and tests of IEC EN 61869-1, IEC EN 61869-2 and IEC EN 61869-3.
When operating the current transformer between 5% of the rated current and the rated continuous thermal current, the voltage transformer must not exceed the voltage error and phase shift limits corresponding to its class within the specified load range and between 80% and 120%.
When operating the voltage transformer between 80% of the rated voltage and the rated voltage multiplied by the rated voltage factor, the current transformer must not exceed the limits of current error and phase shift within the current range corresponding to its class and within the specified limits.
Impulse voltage waves will be applied to the short-circuit primary winding of the current transformer connected to the terminal of the voltage transformer primary winding, which is at high voltage during operation. The same applies to disconnected and multi-disconnected impact tests.
EUROLAB assists manufacturers with IEC EN 61869-4 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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