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VIP Sliding Window Demand Module Calculation is Incorrect

Goals and Symptoms

Summary


  • The VIP Sliding Window Demand module does not calculate the SWinDemand output correctly. If a single sub interval is used, instead of averaging the samples, the output value simply reflects the input value at the time the output updates.


    Keywords

    VIP Sliding Window Demand

    Output

    Incorrect


    Symptoms

    The SWinDemand output register of the VIP Sliding Window Demand module is incorrect. Instead of averaging the samples over the sub interval, the output value simply reflects the input value at the time the sub interval expires and the output is updated. This can be most clearly seen if only a single sub interval is used.


    More Information

    This problem has existed ever since the VIP Sliding Window Demand module was introduced for Pegasys 2.1.

Facts and Changes

Cause
Coding error.


Workaround

There is no workaround for this problem.

Causes and Fixes

Resolution
This issue will be resolved for ION Enterprise 5.5 Service Pack 1.


Document Change History

Date and Initials Comments
2009-10-27 DRM * Corrected incorrect association to "protection relay PRODUCTS\VIP"
* Re-published to Public security level
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