high pressure fluid filled (hpff) hydraulic system data ......line elevation profile from sta a pump...
TRANSCRIPT
Safety First and Always
High Pressure Fluid Filled (HPFF)
Hydraulic System Data Analytics
&
Transition Joint Application
Eversource Energy
Demetrios Sakellaris, Lead Engineer, Transmission Lines Engineering
ICC Conference
Scottsdale, Arizona
October 23rd, 2019
Subcommittee: Educational
Presentation Agenda
▪ Background
▪ Topic 1: HPFF hydraulic monitoring and data analytics
– Basics of the hydraulic system
– Examples of hydraulic events
– Potential opportunities for advanced data analytics
▪ Topic 2: Cable conversion – pilot project
– Project background and location
– Unique challenges
– Current status and next steps
▪ Closing / Questions
2
Background
▪ Over 3 million electric
customers across three states
▪ Approximately 300 circuit miles
of pressurized transmission
cable
– Heavily concentrated in the
Greater Boston area
▪ Ranging in voltage from 115kV
to 345kV
3
Background Cont.
▪ Growing amount of scrutiny surrounding HPFF systems
– Particularly from local authorities and environmental agencies
▪ Growing emphasis on reducing the impact of hydraulic events
– Proactive versus reactive
▪ Opportunities to collaborate with agencies to selectively migrate
towards a non-fluid based solution
– Display our environmental stewardship
4
Presentation Agenda
▪ Background
▪ Topic 1: HPFF hydraulic monitoring and data analytics
– Basics of the hydraulic system
– Examples of hydraulic events
– Potential opportunities for advanced data analytics
▪ Topic 2: Cable conversion – pilot project
– Project background and location
– Unique challenges
– Current status and next steps
▪ Closing / Questions
5
Basics of the Hydraulic System
» All three cable phases within the same steel pipe (filled
with dielectric fluid)
▪ Hydraulic system in EMA has pressure vessels at both remote end line
terminals
– Primary and secondary pressure sources
▪ Multiple lines can be hydraulically fed from the same manifold
– Dual headers: system and maintenance
▪ Pressure vessels have numerous data points that are recorded and
communicated back to the Supervisory Control And Data Acquisition
(SCADA) center
– Data is remotely accessible by users via process book
6
Basics of the Hydraulic System Cont.
7
PP A PP B
PP A
Basics of the Hydraulic System Cont.
▪ As with any pressurized system, outside elements can influence
system readings (ex temperature fluctuation – day versus night)
▪ Particularly when there is a very slow hydraulic event, it can be
very difficult to immediately identify and categorize the nature of
the anomaly
– Typical practice to conduct field investigation
▪ How can a loss of fluid event more easily be identified?
– Can we analyze historic patterns to better identify potential
loss of fluid events?
▪ Legacy systems can be prone to hydraulic events
8
Basics of the Hydraulic System Cont.
Typical Pump Operation
▪ Normal pump operation – triggered at low pressure setting
▪ Temperature influenced (i.e conductor)
9
200 psi @ 1:39AM 200 psi @ 6:55AM 200 psi @ 3:26PM
165 psi @ 1:29AM 165 psi @ 6:41AM 165 psi @ 3:20PM
Examples of Hydraulic Events
▪ Line elevation profile from STA A pump plant to STA B
▪ At Station A pump plant with higher elevation point, typical pump
operation line pressure of 180 psi once pressure drops to 130 psi
▪ At Station B pump plant with lower elevation point, typical pump
operation line pressure of 230 psi once pressure drops to 180 psi
10
STA B approx.
elevation ~ 26 ft
STA A PP approx.
elevation ~131ft
Event location approx.
elevation ~ 37ft
Examples of Hydraulic Events Cont.
▪ 1 week before event (summer)
– Line pressure readings at STA A pump plant
– Min 130 psi, Max 180 psi
11
Examples of Hydraulic Events Cont.
▪ 1 week before event
▪ Tank level readings at STA A pump plant
– Min tank level 2,133 gal, Max tank level 2,145 gal, Avg tank level 2,138 gal
*Note* tank capacity is 3,000 gal
12
Examples of Hydraulic Events Cont.
▪ During event, repair, and repressurization
– Line pressure readings at STA A pump plant
13
Excessive pump operation
Examples of Hydraulic Events Cont.
▪ Pump operated more than 30 times within 12 hour period
– Excessive pump operation alarm
14
Examples of Hydraulic Events Cont.
▪ During event, repair (line de-energized), and repressurization
15
Tanker of fluid injected
Examples of Hydraulic Events Cont.
▪ 1 week after re-energization
– Line pressure readings at STA A pump plant
– Min 130 psi, Max 180 psi
16
178 psi
Examples of Hydraulic Events Cont.
▪ 1 week after re-energization
▪ Tank level readings stabilized at STA A pump plant
– Min tank level 1,329 gal, Max tank level 1,335 gal, Avg tank level 1,334 gal
17
Examples of Hydraulic Events Cont.
▪ Line elevation profile from STA C pump plant to STA D pump
plant
▪ At Station C pump plant with higher elevation point, typical pump
operation line pressure of 190 psi once pressure drops to 130 psi
▪ At Station D pump plant with lower elevation point, typical pump
operation line pressure of 230 psi once pressure drops to 170 psi
18
STA D PP approx.
elevation ~ 26 ft
STA C PP approx.
elevation ~118ft
Event location approx.
elevation ~148ft
Examples of Hydraulic Events Cont.
▪ 1 week before event (summer)
– Line pressure readings at STA D pump plant
– Min 170 psi, Max 230 psi
19
Examples of Hydraulic Events Cont.
▪ 1 week before event
▪ Tank level readings at STA D pump plant
– Min Tank level 2,571 gal, Max Tank level 3,308 gal, Avg Tank level 2,769 gal
*Note* Tank Capacity is 10,000 gal
20
Examples of Hydraulic Events Cont.
▪ During event, repair, and repressurization
– Line pressure readings at STA D pump plant
21
Abnormal amount of pump operation
Examples of Hydraulic Events Cont.
▪ Pump operated more than 25 times within 1 week
22
Examples of Hydraulic Events Cont.
▪ During event, repair, and repressurization
▪ Tank level readings at STA D pump plant
23
Examples of Hydraulic Events Cont.
▪ 1 week after event
▪ Pump operation and line pressure stabilized at STA D pump plant
– Min 170 psi, Max 230 psi
24
Examples of Hydraulic Events Cont.
▪ 1 week after event
▪ Tank level readings stabilized at STA C pump plant
– Min tank level 3,717 gal, Max tank level 3,851 gal, Avg tank level 3,777 gal
25
Potential Opportunities for Advanced
Data Analytics ▪ Can we asses historic information to identify trends associated
with past occurrences to flag when these trends occur again?
▪ What data is critical to achieving a successful predictive model?
▪ Algorithm that can identify non-typical patterns and raise such
occurrences as anomalies to the system operator
26
Potential Opportunities for Advanced
Data Analytics Cont.
27
Potential Opportunities for Advanced
Data Analytics Cont.
28
Potential Opportunities for Advanced
Data Analytics Cont.
29
Potential Opportunities for Advanced
Data Analytics Cont.
30
Potential Opportunities for Advanced
Data Analytics Cont.
▪ Currently we are working to advance the hydraulic study
▪ Also pursuing a tracer injection of the hydraulic system
– Reduce time to locate
▪ Identification of critical input parameters
▪ Benefits of such a software
– Larger HPFF systems can be challenging to monitor,
opportunities to reduce cycle time are critical
– System will continue to age, need advanced solutions to help
better manage aging assets
31
Presentation Agenda
▪ Background
▪ Topic 1: HPFF hydraulic monitoring and data analytics
– Basics of the hydraulic system
– Examples of hydraulic events
– Potential opportunities for advanced data analytics
▪ Topic 2: Cable conversion – pilot project
– Project background and location
– Unique challenges
– Current status and next steps
▪ Closing / Questions
32
Project Background and Location
▪ Attachment to bridge crossing
▪ Investigated other crossing options during project review
33
Project Background and Location
34
Unique Challenges
• Design requirement entailed
need to stay within close
proximity of the existing HPFF
circuits
• Due to limited available space,
need to remove one HPFF
circuit during conduit installation
became apparent
• Restrictions on location of
ductbank as well as extent of
visual exposure
35
Unique Challenges
36
Unique Challenges
37
Unique Challenges
▪ Hydraulic loop has high speed circulation between stations
▪ Study completed to determine if high speed circulation loop can
be broken into two smaller loops and achieve the published
ratings
▪ Need for turnaround piping on either side of the bridge
▪ Avoid need for a hydraulic pipe across bridge
38
Unique Challenges
39
Current Status and Next Steps
▪ Completing design work for circuit alignment on easterly and
westerly bridge approaches
▪ Progress with street test pitting work, utility conflict identification,
obtain approvals from authorities having jurisdiction
▪ Vault placement – determine optimal locations for transition joint
vaults (i.e minimize extent of line pipe rerouting to be needed)
▪ Determine optimal outage schedule to support construction
schedule
40
Questions
41