449   LeapSecondsKnown meaning

Created: 01 Dec 2006

Status: In Force (green)

Part: Part 7-2 (2003)

Links:

Page: 25

Clause: 5.5.3.7.3.3

Paragraph:

Category: Issue for edition 2 of this part

Issue

The meaning of LeapSecondsKnown it is not clear.

Proposal

Clarify

Discussion Created Status
The Leap Seconds and the information that the leap seconds are known is closely related to UTC (Universal Time Coordinated). UTC is well known and used as time base for automation systems.

Excerpt from Wikipedia:

Coordinated Universal Time (UTC) is a high-precision atomic time standard. UTC has uniform seconds defined by International Atomic Time (TAI), with leap seconds announced at irregular intervals to compensate for the earth's slowing rotation and other discrepancies. Leap seconds allow UTC to closely track Universal Time (UT), a time standard based not on the uniform passage of seconds, but on Earth's angular rotation.

More details:
http://en.wikipedia.org/wiki/Coordinated_Universal_Time

I have added the link to the Bibliography at the end of part IEC 61850-7-2.
15 Apr 07 In Force (green)

 

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