Yahoo! is not affiliated with the authors of this page or responsible for its content.
Advanced Protection Methods on SCE�s Circuit of the Future Advanced Protection Methods on SCEs
Distribution
Circuit of the Future
George D. Rodriguez
Manager, Transmission and Substation Technologies
Southern California Edison
Southern California Edison is
one of the largest electrical
utilities with 4.67 million
customers in its 50,000 square
mile territory serving 430 cities
and communities. Nearly 14,000 Employees SCE adds 70,000 New
Customers each year. 5396 Transmission(1,196) and
Distribution circuits(4,200). 857 Total Substations
Southern California Edison
Rising customer expectations and the needs of
a technology driven economy demand superior
safety and reliability from electrical distribution
circuits.at no increase in cost. Advanced technology will make this possible. The Avanti Circuit is a research initiative to
explore technological advancements for future
distribution circuits.
Commitment to Technological
Advancement Advanced Protection Methods on Edisons
Circuit of the Future (CoF)
Objective:
Improve the Detection and Isolation of circuit faults on the
Distribution system to minimize customer interruptions in both
frequency and duration.
Design and test new protection methods with and without a
fault current limiter.
In addition, new fault sensing and prediction techniques will be
studied and tested on the SCE Distribution Circuit of the
Future
Team:
SCE, KEMA, Virginia Tech
DOE Advanced Protection Project DOE Advanced Protection Project
Three Major Tasks over 3 years:
1. Evaluation of new protection schemes on
CoF
2. Design and evaluation of protection
scheme with fault current limiter on CoF
3. Develop and test advanced fault sensing
and prediction methods on CoF
$1.6 M project with $0.6 M cost share Schedule
Protection�on�
Circuit�of�Future
Protection�w/�Fault�
Current�Limiter
Fault�Prediction
$0.48M
Total�Budget�
(w/cost�share�
included)
$0.51M
$0.62M
Deliverable
2006
2007
2008 DOE Advanced Protection Project
Status
Team meeting to discuss detailed scope held 12/05
Contract negotiations underway
Expect contract to be signed in June 2006
SCE will then issue Purchase Orders to subcontractors
(KEMA and VA Tech)
Detailed work will begin July 2006 (6 months behind
original schedule)
Protection work on Circuit of the Future already in
progress The SCE Circuit of the Future:
Status SCE has identified a need to come up
with new ideas to build more reliable and
efficient and easier to maintain
distribution circuits
Provide customers with better service
Improve safety
Reduce O/M costs
Why the Circuit of the Future? 4 Regional SCE Distribution Engineering Teams
SCE Subject Experts
T&D automation
Distributed generation
Communications
Outside Parties
DOE
Oak Ridge National Labs
EPRI
Intelligrid
Calif. Energy Commission
KEMA Consulting
Whos Involved? Location: San Bernadino, CA
New circuit: 12kV
Avanti Circuit
Approximately 23,000
amps fault duty
Will serve
approximately 2,000
customers
Overhead /
Underground facilities
New hardware and
protection schemes
High speed
communications with
fiber Hardware
Modular poles w/ molded cross arms
Vacuum fault interrupter (VFI) / automatic
recloser (AR) / remote controlled switch (RCS)
Duct bank /equipment sensors
Distributed generation/ VAR resource connect
point
Multi-stage capacitor/ transient-less switch
Fault current limiter
RFID tags with data
Active harmonic filter Communication Technologies NetComm 900 MHz
radio for critical switching
operations Fiber-optic cabling to
critical nodes for fast
communications and
high-speed data
transportation May test Broadband
Over Power lines (BPL)
for transport of data and
AMI/ demand response Advanced metering
Benefits of an Automation
Scheme with Fiber
communications:
The automation scheme will
limit the number of customers
affected by a fault. Fiber ckts
used for fast communications
can determine fault location
and send signals to
automatically open the proper
sectionalizing switches,
limiting outage time and
increase reliability for
customers Automation Schemes
FAULT
1
0000
RCI 1 Trips Opens (Fault)
2
0015
RCI 1 Requests RCS 1 to Open
3
0030
RCS 1 Opens
4
0045
RCI 1 Retests and Trips Open (Fault)
Crew Begins patrol.
RCI 1
RCS 1 Mid
Step
Time (sec) OPERATION
Substation
SCENARIO:
Fault After Interrupter
RCS 2 Tie
4
0070
RCS 2 Tie Evaluates Load Request and Closes If Acceptable
4
0060
RCI 1 Requests Load Transfer to RCS2 Tie Remote Controlled Vacuum Fault Interrupter
Combined effort between
Elastimold
VFI hardware
SEL
VFI trip control 351
SEL-2100 Logic Processor
CPI
Control cabinet, switch operator & Integrator
Next generation automated midpoint switch
Configure to sectionalize on loss of voltage or Fault
Potentially reduces customers affected by circuit fault
Data: currents, settings, detailed fault information Communications Assisted Sectionalizing Scheme
AR will utilize SEL 351 R
VFIs will utilize SEL 351 S
AR and VFIs communicate with SEL-2100 Logic
Processor via SELogic Mirrored Bits.
AR and VFIs will have same MT settings i.e. 600 amp
phase / 180 ground
SEL-2100 will trip closest device upstream of fault and
block tripping of other devices
Ground relays will coordinate with 80E fuse.
Phase relays will coordinate with 200E fuse
Sectionalizing Scheme SEL-2100
Logic Processor
AR
VFI
VFI
VFI
SUB
Use of SEL Mirrored Bits
Fiber Links
Serial to Fiber
Converters AR
VFI
VFI
VFI
Block Trip
Block Trip
Block Trip
Shandin
SUB
Typical
Time Overcurrent
Protection between
Sub and AR
Tie RCS
Tie RCS
Tie RCS
Sweetwater 12KV
Sweetwater 12KV
Northpark 12KV
Avanti 12KV
Trip Blocking Scheme VFIs will have directional sensing, will go solid if fed
from reverse direction
History data server will store load data from AR and
VFIs
After faulted section is isolated, computer system will
analyze peak loading for previous week and
recommend to operator the appropriate tie switch(s) to
close to restore the unfaulted line section(s)
Restoration after Fault Circuit of the Future Project Update
Continue work on protection scheme
Vacuum fault interrupters and smart relays
Working to get fault current limiter
EPRI solid state FCL or superconducting FCL
Investigate use of circuit as test bed for advanced
metering and load control
Potential SCE AMI test location in 2007
Potential BPL test site in 2007
Follow up to tests in Rosemead in 2005 - 2006 Schedule
Design & work order preparation in progress
Construction starts in mid 2006
Initial operation December 2006
Soliciting research funding/ partners to build
and test the circuit and to conduct demos Questions &
Answers