If you have landed on this page, chances are you typed into your search engine. You might be trying to find the latest version of the international standard for Instrument Transformers (ITs).
However, on a shady "free PDF" download site.
A: Yes. The standard currently extends up to 800kV AC. For >800kV, you use additional guidelines.
First, a quick clarification: The correct standard is . The search term "618691" is a common transposition error. However, the fact that you are looking for a "hot" (meaning new, trending, or urgently needed) PDF tells us everything we need to know about the current state of the power industry.
Grid modernization, digital substations, and non-conventional instrument transformers (NCITs) are red-hot topics right now. Engineers, procurement managers, and compliance officers are scrambling for the latest , -3 (VTs) , and -9 (Digital Interface) PDFs.
