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Are there any limitations for the distance between electronics unit installed in the substation control building, and a sensing optical element installed on the switchyard?
What is the calibration interval for electronic instrument current and voltage transformers? Is there any equipment for calibration of sensors with the interface conforming to IEC 61850-9-2LE standard?
Are PROFOTECH transformers with digital interface, conforming to IEC 61850-9-2 LE standard, included in the National register of metering devices? What accuracy class do they have?
What is the operating life of the fiber optical current transformer? Is optical fiber exposed to aging?
What kinds of service maintenance does PROFOTECH provide?