If you work for a utility or large manufacturer, your company likely has a subscription to or a national body (e.g., ANSI in the US, BSI in the UK, DIN in Germany). Check your internal library server first.
This standard, which must be used in conjunction with IEC 61869-1, replaced older standards such as IEC 60044-5. Accessing the Standard
It outlines crucial technical criteria, including transient response classes (T1, T2, T3) for ensuring accuracy during faults and strict procedures for mitigating ferroresonance.
This is the most read section by protection engineers. It explains how a CVT behaves during a short circuit. Unlike a voltage transformer (VT), a CVT has a "transient response" that can cause relay overreach if not calibrated correctly. IEC 61869-5 defines the "F" factor (remaining voltage after 1 second).
IEC 61869 is a multi-part standard that defines general requirements for instrument transformers. While Part 1 covers the general rules, specifically addresses Capacitor Voltage Transformers (CVTs) .
It is important to note that searching for "free downloads" of such technical standards often leads to unverified or outdated documents, rather than the official, authorized versions. IEC 61869-5:2011 - Instrument transformers - iTeh Standards
It mandates comprehensive type, routine, and special tests to ensure long-term operational reliability and safety. Evolution:
