Transcript Team BUSS - Senior Design

Team BUSS
Backup Storage Source
Team BUSS
Backup Storage Source
Project Title
Extra High Voltage (EHV) Station
Second DC Storage Source
Sponsor
Idaho Power Company
Team BUSS
Backup Storage Source
Team Members
Rob Butzer
Mitch Colburn
Brian Vandenburg
Team BUSS
Backup Storage Source
Project Background
EHV Substations:
Midpoint 500kV substation
AC power being run through a
transformer
DC power running the relays,
indication lamps and breakers
Team BUSS
Backup Storage Source
Project Background
DC System of a Substation:
DC power supplied by rectified AC
power under normal conditions
DC power also charges the battery for
the occurrence of an ac power outage
Team BUSS
Backup Storage Source
AC Power
Rectifier
Charger
Battery
Relays,Breakers
Team BUSS
Backup Storage Source
Project Background
DC Battery:
Bank of up to 60
batteries
Each battery rated
at about 2.3V
Team BUSS
Backup Storage Source
Project Background
When ac power is lost:
Battery backup activated to keep
relays online, up to 8 hours
Battery used to trip breakers, reenergize the system
This trip may occur up to 8 hours after
the loss of ac power
Team BUSS
Backup Storage Source
Importance
If loss of dc system:
 Can result in a blackout if loss of
protection elements
 Can damage equipment at substations
 Can lose information stored in relays
Team BUSS
Backup Storage Source
Project Deliverables
1. Reliability of DC battery system
2. Alternatives for backup dc storage
supply
3. Implementation of recommended
storage source on Model Power
System
Team BUSS
Backup Storage Source
Problems:
Presently, backup battery system is a
single point of failure within the power
system
On the east coast, it is required to
have duel battery backup system in
any substation over 230kV
Team BUSS
Backup Storage Source
Failures:
Idaho Power has always been able to
re-energize its system
A charger went off line, and voltage
levels fell, and charger was replaced
A cracked lid on a jar caused extensive
smoke to issue from battery bank, but
still able to trip the breakers
Team BUSS
Backup Storage Source
Reliability
Fault Tree Analysis
Each component of the dc system has a
failure rate associated with it
When reliability is calculated, take the
reliability found and multiply by the number of
components to find out how many failures will
occur per year
Team BUSS
Backup Storage Source
Reliability
Fault Tree Analysis
300 devices * 0.0212 = 6.36 failures/year
Team BUSS
Backup Storage Source
Midpoint Battery Specifications:
Continuous load after power is lost
draws 4.0 A. This must be held for 8
hours
Momentary load of 142.8 A to be
supplied at the end of the 8 hour
System voltage of 130V
Team BUSS
Backup Storage Source
Basis for Evaluation of Alternatives:
1. Reliability
2. Cost
-Initial cost, maintenance costs, etc.
Team BUSS
Backup Storage Source
Alternatives
Ultracapacitors
DC generator set
Fuel Cells
Duel Battery
Backup
Team BUSS
Backup Storage Source
Time Schedule
Evaluate Alternatives
Sponsor Presentation
O
b Order storage source for Model Power System
j
e
Lead time for ordered parts
c
t
Calculate Reliability of Current System
i
v
Evaluate Reliability of Alternatives
e
Implement Source into Model Power System
Produce Recommendation Report
4/6
4/26
5/16
6/5
6/25
7/15
8/4
Date
8/24
9/13
10/3
10/23
11/12
Team BUSS
Backup Storage Source
Questions?