WESTERN ELECTRICITY COORDINATING COUNCIL
TECHNICAL STUDIES SUBCOMMITTEE
7 May to 9 May 2014
Salt Lake City, UT
MEETING AGENDA #166
1:00 p.m. – 5:00 p.m.
Day 1: 7 May 2014
1. SRWG Report (P. Mclean)
2:00 p.m.– 3:00 p.m.
A. SRWG Topics
i. Base Case Status
 Four cases have been approved since the last meeting (2024 HS1-S, 2014-15
LW1-S, 2014-15 HW3-OP, 2014-15 LW2-OP). Three cases are currently being
complied (2014-15 LW2-OP, 2015 HSP1-OP, 2019-20 HW1). Next case is
2020HS due to WECC 2014-05-30
 Request for Overcurrent relay data included in the request letter for 19-20HW1.
Considerable discussion has been triggered among different utilities regarding
the scope of this request. An attempt at clarification has been provided by the
following wording:
The scope of the data request is as follows:
Submit data for any phase overcurrent protection devices that
1. protect transmission lines energized at 200kV or above or transformers
where any terminal is energized at 200kV or above, and
2. are not supervised by timers or other components that limit operation
operation of the device to a specific condition (such as loss-of-potential or
switch-onto-fault), and
3. are not used as part of a protection scheme where they supervise other
devices, and
4. are able to operate in less than sixty seconds.
This request applies whether the overcurrent protection is considered “Primary”,
“Secondary”, “A”, or “B”; however if the A and B protections have identical settings
and operating characteristics, only one need be submitted. This request does not
apply to ground, neutral or zero-sequence overcurrent relaying; or to generator
protections.
SRWG invites TSS members’ comments clarifying the scope of the overcurrent
relay data request
ii. Data Preparation Manual
 The DPM does not explicitly mention modeling requirements for distributed
generation; however it does require a generator model for all 10+MVA Units and
20+MVA aggregation. Interpretation is that this rule applies equally to
distribution-connected generators, and hence the Netted Generation Section of
the DPM does not require change at this time.
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
Removed temporary bus number assignment of bus numbers 91,000-91,999 as
internal bus number from the DPM
 SRWG received a presentation on GIC considerations, raising the question of
how to collect and manage GIC data. WECC regional criteria is a potential tool
for managing interconnection wide GIC modeling data. One of the most
important data items to collect as a starting point is Latitude and Longitude.
 Alternate (BCCS) DPM is under development, addressing the major differences
from the existing process:
 submitting PRJ files and approval process;
 case review and changes by additional PRJ files
 Need to change MDF manually;
 LR files.
 Removed all references to Master Tie-line File
iii. Representation Log
 No new items have been added to the replog, but counts have increased. SRWG
will focus on reducing the Long Load ID first. Secondary foci are unapproved
models, starting with “gewtg” records as a focus area, and “PSS Required”.
Model Implementation schedule is being developed by SRWG and will be
posted on the SRWG webpage.
iv. Annual Study Programme
 As reported at TSS 165, SRWG has adopted the Annual Study Programme
Statement of Work from the PCC taskforce, for the 2014 Annual Study
Programme. A set of Category C standard disturbances, one for each region, is
being compiled to be run on every case as it is compiled as a data-check on the
compiled case
 The Base Case compilation schedule for the 2015 Annual Study Programme is at

http://www.wecc.biz/committees/StandingCommittees/PCC/TSS/SRWG/20140423/List
s/Minutes/1/2015_Base_Case_Compilation_Schedule-Clean-v2.doc
Light load definition was discussed extensively, with a consensus emerging that
the goal is to define light load cases as a percentile on the total WECC curve,
while addressing the challenge of defining the point in time in the case
description since each area will have a different percentile point on the load
duration curve for their light load hour. This issue is too big to answer in the
timeframe required for publishing the 2015 schedule, so the Compliance SubGroup will develope a methodology to define light load cases using load duration
curves.
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