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Quality Flagging

Quality flags are critical for determining the state, age, and availability of data. Some quality flag parameters include:

·       Valid

·       Invalid

·       Older than normal

·       Questionable

·       Overflow of an analog value

·       Out of range

·       Bad reference

·       Oscillating too rapidly

·       Failure

·       Inconsistent

·       Inaccurate

·       Substituted for another value

·       Provided by a source that does not provide quality flags

·       Calculated value

·       Manually entered value

·       Under test or in maintenance

·       Blocked so that the value is not updated

·       Tagged to prevent different types of control actions

Keywords:            Quality, flag, tag, block, validation

IntelliGrid Architecture
Copyright E2I and EPRI 2004