Transmission Availability Data System (tads) Data Reporting Instruction Manual August 1, 2014 For Calendar Year 2015
Additional Common Inventory Changes
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- Appendix 9 – Detailed Automatic Outage Data Examples
30.Additional Common Inventory ChangesSituation 1The addition of a TADS Element on a common structure with a non-new reportable TADS Element – Based on new NERC definition for BES to include all elements 100 kV and above 
In this situation, AC Circuit CF was placed on a common structure with an existing 138 69 kV circuit. For TADS, this common structure situation shall not be included in the Multi-Circuit Structure Mile calculation. For TADS, you are only to report those Multi-Circuit Structure Miles where two or more TADS Elements share a common structure. The calculations for AC Circuit CF are the same as in the Base Model. Base Case and Situation 1 Multi-Circuit Structure Miles Data, Form 3.5 
Appendix 9 – Detailed Automatic Outage Data ExamplesThe following examples illustrate several AC Circuit Automatic Outages scenarios accompanied by (in most cases) a Transformer Automatic Outage scenario. Data entries for each scenario are shown in tables along with each scenario. Finally, illustrations of the applicable sections of Form 4.1, Form 4.2 and Form 5 with the appropriate data entries for all outages are shown. While not all possible situations could be covered, the examples are complete enough to help with outage interpretation. Example 1: Three-terminal AC Circuit with a new reportable TADS Element – Based on the new NERC definition of all facilities 100 kV and above are TADS elements. This is a three terminal AC Circuit with a new TADS Element attached to one of the segments. The new TADS Element, based on the new BES element definitions of 100 kV and above, is the 345/138 kV Transformer. Since the Transformer is now considered a TADS Element, outages to the transformer are now reportable. It is important to note in this example the application of the TADS In-Service State definition. There is only one exception, the multi-terminal transformer exception, that an Element be “connected at all its terminals” to be considered in an In-Service State. This exception applies only to a multi-terminal AC Circuit with a Transformer on one terminal sharing a breaker with the circuit. Figure A9-1 Figure A9-2  
All circuits are 230 kV In both figures, the AC Circuit is bounded by AC Substations “A,” “B,” and “C” as indicated by the red arcs. Each Transformer’s boundaries are the red disconnect switch and the red arc before the breaker. Note, that the Transformer in either figure may or may not be a reportable Element (i.e., one with a low-side voltage ≥ 100 kV). Assume that each Transformer is out of service because of the operation of its associated breaker (indicated in green). In Figure A9-1, the AC Circuit would normally be considered out of service since the breaker at AC Substation C, which is shared by the AC Circuit and the Transformer, is open. Nevertheless, if all other portions of the AC Circuit are in service, the entire AC Circuit is considered to be in an In-Service State even if the Transformer is out of service. Because TADS does not recognize partial outage states, the multi-terminal exception above was developed. This avoids overstating the outage contribution of this multi-terminal configuration type. In Figure A9-2, the open breaker is not shared by the AC Circuit, and the AC Circuit remains connected. Thus, the exception does not apply in this case since the AC Circuit is connected at all its terminals even though the Transformer is out of service.
Example 2: Three-terminal AC Circuit with a TADS Element This is a three-terminal AC Circuit with a TADS Transformer attached to one of the segments. Since the Transformer is a TADS Element, its outage is reportable. See Outage reporting table below:
Example 3: Bus fault that interrupts TADS Elements 
This is an outage of a 345 kV bus caused by contamination. No damage resulted, and all the AC Circuits connected to the bus are reportable. See Outage reporting table below:
Example 4: AC Circuit that is directly connected to a TADS Transformer 
The AC Circuit structure was damaged by the tornado and required replacement. See Outage reporting table below:
Example 5: Three-terminal AC Circuit 
Example 6: Outage to two AC Circuits with common cause 
Note: The outages would have been characterized as a Common Mode Outage even if the AC Circuits had not been on common structures. Example 7: Transformer outage 
Only the Transformer was outaged because of the relay misoperation. See Outage reporting table below:
Example 8: AC Circuit outage with a breaker failure 
Form 4.1 AC Circuit Detailed Automatic Outage Data 
Continued… Form 4.3 Transformer Detailed Automatic Outage Data 
Form 5 Event ID Code
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