FLA Considering Old Fault Current Measurement While Processing a New Fault

(Doc ID 2421814.1)

Last updated on JULY 12, 2018

Applies to:

Oracle Utilities Network Management System - Version 2.3.0.1.0 to 2.3.0.2.0 [Release 2.3]
Oracle Network Management for Utilities - DMS - Version 2.3.0.1.0 to 2.3.0.2.0 [Release 2.3]
Information in this document applies to any platform.

Symptoms

On : 2.3.0.2.0 version, Web DMS

Fault Location Analysis (FLA) considers old Fault Current measurements while processing a new fault

Customer has some scada reclosers where fault amps are not reset after the fault is cleared. Only fault targets are reset. In such cases, if a new fault occurs while the device still has old fault amps, FLA is considering the old fault amps in processing the new fault.
For example:
   An LG Phase A fault occurred on a recloser.
   After the fault is cleared, the target is reset.
   After some time, another fault occurred on the same device on Phase B.

FLA is processing it as a LL fault on phases AB which is incorrect.


The system should be smart enough to exclude old measurement values from its calculations.

The issue can be reproduced at will with the following steps:

  1. In the viewer, search for a breaker
  2. Bring up Scada summary and enter fault amps A as 2065 through manual entry and set Fault Target A to 1
  3. Observe a new fault event is triggered showing Phase A to ground fault
  4. Clear the fault target from Scada Summary and leave fault amps
  5. Trigger another fault event by entering Phase B fault amps as 2065 and set Phase B target to 1
  6. Observe another fault event is triggered showing  Phase B to ground fault


Cause

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