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 23 rd , 2019 Subcommittee: Educational
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High Pressure Fluid Filled (HPFF) Hydraulic System Data ......Line elevation profile from STA A pump plant to STA B At Station A pump plant with higher elevation point, typical pump
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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