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  • 2015 TPL

    Short Circuit Scope

    Engineering TWG approved on 3/18/2015

  • 2015 TPL Short Circuit Scope 1

    Revision History

    Date or Version

    Number

    Author Change Description Comments

    12/30/2014 SPP Staff Initial Draft

    2/10/2015 SPP Staff Update based on the February

    TPLTF meetings

    3/6/2015 SPP Staff Update based on member

    feedback

    3/9/2015 SPP Staff Update based on the March 9th

    TPLTF meeting

  • 2015 TPL Short Circuit Scope 2

    Table of Contents Revision History ...........................................................................................................................................1

    Overview .......................................................................................................................................................3

    Data inputs ....................................................................................................................................................4

    Modeling data ..................................................................................................................................4

    Data required by the PC ...................................................................................................................5

    Initial Data request ................................................................................................................................... 5

    Subsequent Data request .......................................................................................................................... 5

    Short Circuit Simulation .............................................................................................................................6

    Analysis............................................................................................................................................6

    Software parameters.........................................................................................................................6

    Deliverables ..................................................................................................................................................7

    Assessment Distribution ..............................................................................................................................8

    Schedule ........................................................................................................................................................9

    Changes in Process and Assumptions ........................................................................................................11

  • 2015 TPL Short Circuit Scope 3

    Overview

    This document presents the scope and schedule of work for the NERC TPL-001-4 Short Circuit

    Assessment. This document will be reviewed by the Transmission Planning Task Force (TPLTF),

    Transmission Working Group (TWG), and the applicable functional entities as described in NERC

    TPL-001-4, A.4.1. SPP, as the Planning Coordinator (PC1), will coordinate with the Transmission

    Planners (TP) to exchange data. The assessment begins in January 2015 and is a 12-month study

    scheduled to be finalized by December 2015.

    1 In this document, SPP does not represent a TP.

  • 2015 TPL Short Circuit Scope 4

    Data inputs

    Modeling data

    Modeling data required in the TPL Steady State study is incorporated through the annual SPP

    MDWG model building process. The SPP MDWG model building process is performed in

    accordance with the applicable NERC Modeling, Data, and Analysis (MOD) Standards. In order to

    meet the R1 requirements, the models must represent the following:

     Existing Facilities

     Known outage(s) of generation or Transmission Facility(ies) with a duration of at least six months

     New planned Facilities and changes to existing Facilities

     Real and reactive Load forecasts

     Known commitments for Firm Transmission Service and Interchange

     Resources (supply or demand side) required for Load

    However, these requirements are not applicable in determining the interrupting capability of circuit

    breakers required for Faults for all system conditions. The System short circuit model with all

    planned generation and Transmission Facilities in service is represented with the following

    additional requirements:

     Place all available facilities in-service: o Generation o Transmission lines (Out for maintenance) o Transformers o Buses

     Flat – classical fault analysis conditions

    The model set in the table below establishes category P0 as the normal System condition in TPL-

    001-4 Table 1, and defines the models that will be used for the 2015 TPL short circuit analyses.

    These models were chosen to comply with requirement R2.3

    Requirement Description Study case

    R2.3 Year 1 Maximum Fault Short Circuit MDWG 2016S

  • 2015 TPL Short Circuit Scope 5

    Data required by the PC

    Initial Data request

    There is not an initial data request for ASCC results, because the PC will run a short circuit analysis

    on all buses in the short circuit model within the PC footprint.

    For TPs that require ANSI Fault Current calculation, each TP will provide to the PC the following

    ANSI Fault Current Calculation parameters to be used for each bus within the TP area:

     Divisors o For branches in positive sequence o For machines in positive sequence o For branches in zero sequence o For machines in zero sequence

     Fault multiplying factors o DC decrement only or AC and DC decrement

     Max operating voltage, in PU

     Contact parting times, in seconds

    Subsequent Data request

    Corrective Action Plans for instances where the short circuit current interrupting duty exceeds the

    equipment rating.2 Use of Activity ANSI requires a second step involving line-out cases if the full

    bus-fault current exceeds the interrupting capability of the breaker under review. The TP will

    provide a listing of each bus number for which a line-out analysis is required for Activity ANSI to be

    performed by the PC.

    2 R2.8

  • 2015 TPL Short Circuit Scope 6

    Short Circuit Simulation

    Analysis

    The PC will send out the total Bus fault current study results for SLG and 3 phase faults to the TPs.

     Full bus-fault current and line-out results using ASCC

     Full bus-fault current using ANSI o Line-out results for buses provided in subsequent request

    The TPs can perform their own short circuit analysis in lieu of the PC provided results. The TP will

    evaluate the results and respond to the PC with necessary Corrective Action Plans (CAPs) based

    upon TP analysis/feedback and subsequent data request for the required ANSI line-out results. The

    PC will verify the validity of the TP submitted CAPs.

    Software parameters

    PSS/E settings:

     Run activity FLAT o Set classical Short Circuit Assumptions (activity FLAT,CL)

     Set Tap Ratios to unity (1.0)  Set Charging to zero (0.0)  Set Shunts to zero (0.0) in all sequences3

     Use Automatic Sequence Fault Calculation (ASCC) function o Three phase fault o Line to Ground (LG) fault o Line Out (LOUT) fault o Impose flat conditions o I”k contributions to “N” levels away

     N=0

     Use ANSI Fault Current Calculation (with defaults below unless alternate provided by TP) o Divisors

     For branches in positive sequence = 40.0  For machines in positive sequence = 80.0  For branches in zero sequence = 40.0  For machines in zero sequence = 80.0

    o Fault multiplying factors = DC decrement only o Output Format = Summary output using ANSI R and X o Max operating voltage, in PU = 1.05 o Contact parting times, in seconds = 0.033

     Short Circuit Output = Physical

     Short Circuit Coordinates = Polar

     Short Circuit Parameters = 3 Phase

    3 Set line shunts to 0.0 in the positive (and hence negative) sequence, and fixed and switched shunts to 0.0 in all three

    sequence networks.

  • 2015 TPL Short Circuit Scope 7

    Deliverables

     Initial submittal of total Bus Fault Currents from PC to TPs in an Excel format o Full bus-fault current and line-out results using ASCC o Full bus-fault current using ANSI

     Subsequent submittal of line-out Bus Fault Currents using ANSI from PC to TPs in an Excel format

     Draft TPL-001-4 Short Circuit Assessment

     Final Comprehensive TPL-001-4 Assessment

  • 2015 TPL Short Circuit Scope 8

    Assessment Distribution

    Each Planning Coordinator and Transmission Planner shall distribute its Planning Assessment

    results to adjacent Planning Coordinators and adjacent Transmission Planners within 90 calendar

    days of completing its Planning Assessment, and to any functional entity that has a reliability related

    need and submits a written request for the information within 30 days of such a request. 4

    If a recipient of the Pla

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