Transmission Availability Data System (tads) Data Reporting Instruction Manual August 1, 2014 For Calendar Year 2015

Introduction

Effective July 1, 2014, the definitions for the Bulk Electric System (BES) for the TADS data reporting were revised to reflect the new FERC definitions for the BES. The new FERC BES definitions will include all Elements and Facilities, 100 kV and above, necessary for the reliable operation and planning of the interconnected system as BES elements. Users may find Aadditional information on the revised BES definitions iscan be found at:

1. 
   The Transmission Availability Data System Revised Final Report (“Phase I Report”) that was approved by the NERC Planning Committee on September 26, 2007 and by the NERC Board of Trustees on October 23, 2007. Phase I addresses the collection of Automatic Outage data beginning in calendar year 2008. The Phase I Report can be found at:
   

2. 
   The Transmission Availability Data System Phase II Final Report (“Phase II Report”) approved
   by the NERC Planning Committee on September 11, 2008 and by the NERC Board of Trustees on October 29, 2008. Phase II addresses the collection of Non-Automatic Outage data beginning in
   calendar year 2010. The Phase II Report can be found at:
   

Section 5.1 of the Phase II Report allows NERC to conduct data validation reviews with the submitting Transmission Owners (TO’s) of TADS data submissions for Automatic and Non-Automatic Outages. To the extent that a review indicates systematic data entry errors, data entries for previous years may need to be revised. To facilitate the correction of potential data entry errors, TO’s are required to maintain historical supporting information used to develop its TADS data for a five-year period. This requirement began with the collection of Automatic Outage Data for calendar year 2009 and is discussed in Section 1.7.1.

3. 
   Changes to include detailed inventory collection and quarterly reporting were approved by the NERC Planning Committee and the NERC Board of Trustees on December 19, 2012. The document detailing these changes is located at:
   

4. 
   Also approved on December 19, 2012 was a request to align TADS data collection with the new Bulk Electric System definition. However, due to a delay in implementing this new definition, the implementation date for these changes was changed to start on outages starting in the 2015 TADS reporting year.The document detailing these changes is located at:
   

AC Circuits ≥ 100 kV phase to phase (Overhead and Underground Circuits) included in the Bulk Electric System. All Elements currently in TADS that are no longer considered in the Bulk Electric System should be retired with a retirement date of January 1, 2015. Radial circuits are included.

DC Circuits with ≥ +/-100 kV DC phase to ground (Overhead and Underground Circuits) voltage

Transmission Transformers with ≥ 100 kV low-side voltage that are included within the Bulk Electric System

AC/DC Back-to-Back Converters with ≥ 100 kV AC voltage, both sides

1.1.1 Manual Suggestions

NERC encourages suggestions for improvements to this Manual to tads@nerc.net. This includes everything from typographic mistakess to unclear instructions. Changes will be noted in subsequent updated versions of the Manual.

2.1.2 TADS Definitions

The TADS Definitions document is a stand-alone definitions document in Appendix 7. Most of the terms in the forms have specific definitions that may differ from the common usage of the same term. For example, the term “AC Circuit” is specifically defined and includes both two and three-terminal circuits. Therefore, it is important that the TO refer to the definitions when completing the forms.

1.2.1 AC and DC Voltage Classes

Appendix 7 defines six seven Voltage Classes. Voltages are operating voltages. These cover the range of possible AC and DC voltages. For reporting, however, we have defined sixfive AC Voltage Classes by combining two voltage ranges, 400-499 kV and 500-599 kV, into one 400-599 kV class since there are no North American, AC Elements in the 400-499 kV range in North America. However, all sevenfive Voltage Classes are available for DC Elements.

Table 1.2: Element Voltage Classes
AC Voltage Classes	DC Voltage Classes
Less than 100 kV (Bulk Electric System Only)1	Less than 100 kV (Bulk Electric System Only1
100-199 kV	100-199 kV
200-299 kV	200-299 kV
300-399 kV	300-399 kV
400-599 kV	400-499 kV
600-799 kV	500-599 kV
	600-799 kV

1.2.2 What ElementsOutages Should be Reported in the Less than 100 kV and 100 -199 kV Voltage Classes?

You must make two major distinctions before you report Outages for Elements in these two Voltage Classes:

1. 
   Is this Element part of the Bulk Electric System?
   
2. 
   Is the Outage a Sustained , Automatic Outage?
   

For the Less than 100 kV and 100-199 kV Voltage Classes, oall Voltage Classes, only Elements that are part of the Bulk Electric System should be reported forare reported within the TADS program. There are several, important reasons that an Element would not be reported (including belonging to a local network meeting certain conditions and radial lines), and the Bulk Electric System definition should be consulted before reporting an Element within TADS.

This is especially true for Elements in the Less than 100 kV Voltage Class. Elements in this Voltage Class must be specifically included in the Bulk Electric System by a request for Bulk Electric System Exception request for inclusion. A TO’s should have very few, if any, Elements that fitting this definitioncriterion.
TO’s are encouraged to carefully peruse the Bulk Electric System definitions, available at http://www.nerc.com/pa/RAPA/Pages/BES.aspx. AlsoIn addition, Regional Entity contacts are available on that web page that you may ask about specific Elements and their applicability to the Bulk Electric System.
Once you have determined that the Element in question is TADS-reportable, you must determine whether the Outage is a proper Outage to report within TADS. For Elements in the Less than 100 kV and 100-199 kV Voltage Classes, only Sustained Outages should be reported. These are Automatic Outages with a durationduration oflasting 1 minute or longer. No Planned or Operational Outages should be reported for Elements in these Voltage Classes iin 2015.

1.2.3 How dDoes the Nnew Bulk Electric System Definition Affect 200 kV+ TADS Elements?

Effective January 1, 2015, TADS reporting will align with the Bulk Electric System definition. This change will result in some 200 kV+ Voltage Class TADS Elements no longer being reportable withed in TADS. This change mainly will affect AC Circuits in the 200-299 kV Voltage Class. Primarily, they would no longer be reportable if they are radial circuits and not specifically included in the Bulk Electric System or by a specific inclusion in the definition.

If your company has a TADS-reportable Element in 2014 reporting that is no longer reportable in 2015 due to being Bulk Electric System exempted, the Form 3.x series has a field called “BES Exempted”. By setting this field to the Boolean value of TRUE and changing the Retirement Date of the Element to January 1, 2015, the Element accounted for properly within TADS.
If you have a question about whether a specific Element is part of the Bulk Electric System, you should refer to the Regional Entity contacts available at: http://www.nerc.com/pa/RAPA/Pages/BES.aspx for clarification.

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