See Also
Each contingency element has an associated Status. This determines if the action will be implemented at all, and if Model Criteria is defined, when that will be evaluated.
Some of the status options are available with Arming Status that can be specified with Remedial Actions and Remedial Action Elements. The options that are applicable to Arming Status will be described with that option.
Status Field Options
Check
The action will only be executed if the Model Criteria is true or if no Model Criteria is specified. Check is the default status setting.
This action is available for the Arming Status used with Remedial Actions and Remedial Action Elements. A Remedial Action or Remedial Action Element will only be armed if its Arming Criteria is true or no Arming Criteria is specified.
Always
The action will always be executed, regardless of the Model Criteria.
This action is available for the Arming Status used with Remedial Actions and Remedial Action Elements. A Remedial Action or Remedial Action Element will always be armed regardless of its Arming Criteria.
Never
The action will never be executed, regardless of the Model Criteria. This allows you to disable a particular contingency action without deleting it.
This action is available for the Arming Status used with Remedial Actions and Remedial Action Elements. A Remedial Action or Remedial Action Element will never be armed, which means that it will never be executed regardless of its Arming Criteria. This allows you to disable a Remedial Action or Remedial Action Element without deleting it.
TopologyCheck
The Model Criteria for this action will be evaluated after Check and unconditional actions are applied but before the power flow is solved. This action will only be executed if the Model Criteria is true or if no Model Criteria is specified. If no Model Criteria is specified, this action will be applied when the Check actions are evaluated. When evaluated before the power flow is solved, this type of action is only useful with topology changes because line flow and bus voltage changes will not take affect until after the power flow is solved.
Additionally, any TopologyCheck actions that have not been applied will be evaluated again AFTER the power flow is solved. TopologyCheck actions will be treated the same as PostCheck actions when they are evaluated after the power flow is solved. This will allow evaluation of any Model Criteria that might depend on other TopologyCheck actions being applied. If any actions, either TopologyCheck or PostCheck, are applied, any remaining TopologyCheck actions will again be evaluated BEFORE the power flow is solved again and after the topology update has been performed. This process will continue until no additional TopologyCheck or PostCheck actions are applied.
This behavior only occurs when the Calculation Method for the analysis is set to Full Power Flow and solving the ac power flow or using Iterated Linear Analysis. Otherwise, the TopologyCheck status instead acts as a Check status.
PostCheck
This action will be considered AFTER all Check, Always, and TopologyCheck actions have been performed and the power flow solution solved. If no Model Criteria is specified, this action will be applied when the Check actions are evaluated, i.e. before the power flow is solved. If the Model Criteria specified for the PostCheck action is met in the solved power flow solution, this action is taken and the power flow is solved again. If the model conditions are not met, the action is skipped. This process repeats recursively for all Postcheck actions until complete.
Additionally, any TopologyCheck actions that have not been applied will be evaluated along with the PostCheck actions AFTER the power flow is solved. See the TopologyCheck section above about more information on how the TopologyCheck actions are evaluated before and after the power flow is solved.
This behavior only occurs when the Calculation Method for the analysis is set to Full Power Flow and solving the ac power flow or using Iterated Linear Analysis. Otherwise, the PostCheck status instead acts as a Check status.
SolutionFail
Added in Version 19
This action is considered immediately after a power flow solution is attempted during the process of running a contingency. If a solution failure is encountered the power flow solution state will be restored to what existed before the failed solution. Then if this action's Model Criteria is met (or none is defined) the action will be applied and another power flow solution will be attempted.
See the topic Running the Contingency Analysis for more information on how contingency actions are processed based on Status and other settings. Additionally, Transient Models can be included in a steady-state contingency run. This topic will describe where they are included in the process.