See Also
Simulator allows you to automatically generate a transient contingency list containing branch faults, bus faults, or generator opens. To accomplish this, click the Auto Insert button along the bottom of the Transient Stability Dialog. This opens the Auto Insertion of Contingencies Dialog.
When automatically inserting contingencies, you must specify the type, options and naming conventions you want for the new contingencies. You must also specify whether to delete or retain existing contingencies.
The options for auto inserting transient stability contingencies work identically to the options for auto inserting power flow contingencies. These are describe in detail in the Auto Insert Contingencies help topic, so please see that topic for details on the many options for choosing which devices to auto insert contingencies for. The only differences with the transient stability contingency auto insertion is that additional fields must be specified as follows.
Event Time
This is the time in seconds at which the first contingency events will occur (typically a fault).
Event Duration
This is the time delay (after Event Time) in seconds at which subsequent contingency events will occur (typically opening devices).
Location %
For branch faults, this is the percent distance along the line at which the fault occurs. Values must be specified between 0 and 50%.
Self Clearing Fault Added in Version 20, build on May 14, 2018
Check this box for Lines, Transformer and Buses so that the fault applied will be marked as a Self Clearing Fault. This means that once the fault location is isolated then the fault will automatically clear itself. See Transient Stability Contingency Element Dialog for more information on self clearing faults.
Self Clear Open Devices Added in Version 20, build on May 14, 2018
When choosing to auto-insert self clearing faults, if this box is not checked then the additional actions to open devices to isolate the fault will not be used. Check this box to also force the opening device actions to be inserted after the Event Duration as well.
Depending on the type of contingency being automatically inserted, contingencies will be created with appropriate contingency events as follows.
Single Transmission Line
Simulator automatically creates two contingencies that each have three events. A fault occurs at the Event Time, and then two events of OpenFrom and OpenTo are applied after the Event Duration. The two contingencies only differ by the Fault Location. The user specifies a Fault Location in percentage (value between 0 and 50) and then two contingencies are created with Fault Location and "100 – Fault Location". If a Fault Location of 49.5 or higher is specified, then only one contingency with a Fault Location of 50% is created.
Single Transformer
Simulator automatically creates two contingencies which each have three events similar to what is done for a Single Transmission Line. The Fault Location however is always at the two terminals of the transformer.
Single Bus
Simulator automatically creates one contingency which has two events. A fault occurs at the bus at the Event Time and then the bus is opened (all lines attached to the bus are opened) after the Event Duration.
Single Generator
Simulator automatically creates one contingency which has one event. The generator is opened at the Event Time.