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Gas Insulated Substations Best Practices

Event Description and Agenda:

Featuring a tour of a GIS substation, this technical symposium will review GIS technology and detail current design trends and maintenance solutions for gas insulated substations. Utilizing both technical presentations and case studies from leading utilities, attendees will be provided with a sound understanding of GIS capabilities as well as real-world examples of the regulatory, business, and aesthetic considerations involved in selecting and constructing GIS substations. In addition, experts will cover technical and commercial capabilities, review greenhouse gas issues, illustrate how to replace aging infrastructure with GIS, review considerations for selecting indoor and outdoor GIS, commissioning, constraints and challenges from an engineer's perspective, assessments of AIS and GIS alternatives, and the utilization of GIS in other countries. Gas insulated substations (GIS) offer many advantages over traditional substation designs. Utilizing Sulphur Hexaflouride or SF6 to insulate between the active and non-active components of a substation can dramatically reduce the clearance distances and provide greater design flexibility in congested urban areas where space is at a premium. The flexibility of GIS substations provides the ability to design and build high-capacity substations underground in existing buildings as well as in other untraditional substation locations. Further, GIS technology allows greater flexibility in substation design, permitting expansion and modification of existing air insulated substation (AIS) through the integration of GIS components. GIS substations require less maintenance and repair than traditional substations and are less subject to environmental harms such as inclement weather, snow, pollution, dust, and wind. By enclosing gas insulated substations, utilities can reduce noise and safety concerns, while improving community aesthetics.


Monday, January 26, 2015

8:00 - 8:30 a.m. :: Registration and Continental Breakfast

8:30 - 8:45 a.m :: Introduction

8:45 - 9:30 a.m :: Gas Insulated Substation Evolution

Since the first gas insulated substation (GIS) was introduced in 1967, the technology has driven other advances. For example, substation equipment and clearances have been made smaller since SF6 gas is a better insulator, components within the substation have become more compact allowing for considerably reduced substation footprints and esthetically pleasing designs. Since 1967, GIS technology has developed, grown and matured to where it is now being accepted and embraced by the industry. Public Service Electric & Gas Company (PSE&G) had no gas insulated substations in service until 2011. Some of the reluctance to deploy this technology was based on cost, the ability to adapt to new work practices, new operating procedures and fear of the unknown. This presentation will focus on PSE&G's GIS evolution, technical, financial and practical drivers for the implementation of GIS, lessons learned related to new operating procedures, testing programs, specifications, timing, problems etc.

Larry Johnson, Substation Equipment Expert, PSE&G

9:30 - 10:15 a.m. :: SF6 Emission Reductions, Management, and Mandatory Reporting Program

As of 2011, mandatory emissions reporting is required for users of electrical transmission and distribution (T&D) equipment with nameplate capacity over 17,820 lbs. The SF6 Emission Reduction Partnership for Electric Power Systems is a collaborative effort between EPA and the electric power industry to identify and implement cost-effective solutions to reduce sulfur hexafluoride (SF6) emissions. SF6 is a highly potent greenhouse gas used in the industry for insulation and current interruption in electric transmission and distribution equipment. This presentation will provide an overview of US climate protection activities and an update on policies and programs specific to SF6 including the EPA SF6 Emission Reduction Partnership and the mandatory Greenhouse Gas Reporting Program.

Sally Rand, Climate Change Division, Environmental Protection Agency

10:15 - 10:45 a.m. :: Networking Break

10:45 - 11:30 a.m. :: Utility Case Study: Rancho Vista 500/220kV GIS - Southern California Edison

This presentation will provide the engineering and design process of a 500/220 kV gas insulated substation in Southern California Edison System. Topics include:

  • GIS vs AIS evaluation
  • Design considerations for SCE's Rancho Vista 500/220kV gas insulated substation
  • Engineering challenges and solutions

Hua Ying Liu, Senior Engineer, Substation Apparatus Engineering, Southern California Edison

11:30 a.m. - 12:30 p.m. :: Group Luncheon

12:30 - 1:15 p.m. :: GIS Commissioning

Due to the complexity of gas insulated substation (GIS) equipment, the testing/commissioning of this equipment is different from the testing/commissioning of the traditional air insulated substation (AIS) equipment. This presentation will describe the similar testing of the AIS and GIS equipment as well as the additional testing that is performed to test/commission a gas insulated substation.

Daniel Sleezer, Senior Engineer, Sargent & Lundy

1:15 - 2:00 p.m. :: Utility Case Study: ComEd's Urban GIS

After numerous outages and failures of their distribution system in the late 1990s, ComEd began to overhaul their distribution system in downtown Chicago. Multiple GIS substations were installed to provide a robust and reliable electric supply to the downtown area. This session will provide information surrounding ComEd's previous, current, and future plans with this type of substation.

Gregory Hitzke, Equipment Specialist, Circuit Breakers, GIS, ComEd

2:00 - 2:45 p.m. :: Utility Case Study: Anaheim Public Utilities

This presentation will feature why the City of Anaheim uses EPC contracts (Design-Build) for its large projects and highlights of the 4 GIS projects it has built:

  • Why EPC and its advantages
  • Park Substation - totally underground distribution substation with a Park area on top of facility
  • Lewis/Vermont Substation - upgrades to existing facility and backup 230/69kV Substation
  • Anaheim Substation - distribution substation with a fašade of an old power plant in the downtown area
  • Canyon Substation - 69kV Switchyard for 200MW generation facility

Larry Davis, Capital Projects Manager, Anaheim Public Utilities

2:45 - 3:15 p.m. :: Networking Break - SPONSORED BY HITACHI

3:15 - 4:00 p.m. :: Utility Case Study: Replacing Aging Infrastructure with GIS at PG&E

PG&E is an investor owned utility serving nearly 5 million electric customers in its 70,000 square mile service territory in Northern and Central California. PG&E is in the midst of a major capital expenditure program to replace aging infrastructure and increase the reliability of their service territory. This presentation will discuss the role that GIS is playing in PG&E's program and the means by which their multi-departmental GIS Core Team is incorporating GIS technology into their engineering, procurement, construction and commissioning processes and standards.

Godwin Duru, Senior Consulting Engineer, GIS Core Team Lead, Pacific Gas & Electric

4:00 - 4:45 p.m. :: Case Study: GIS Installations in Tokyo, Japan

Due to the space limitations in a very dense urban area, electric utility companies in Tokyo planned to construct underground substations. Many underground substations have been completed and have been in operation using gas insulated transformer technology. This presentation will highlight the advantages of utilizing GIS in this setting, including discussions of projects installed both indoors and outdoors. Additionally, GIS substations can replace existing AIS substations while minimizing outage periods during construction.

Taikichiro Kyoto, T&D Division, Toshiba International Corporation

4:45 - 5:00 p.m. :: Q&A

Tuesday, January 27, 2015

8:00 - 8:30 a.m. :: Continental Breakfast

8:30 - 9:15 a.m. :: GIS Substation Design Optimization and Evaluations of AIS and GIS Alternatives

This presentation will address the means by which comprehensive assessments of AIS and GIS alternatives are performed.

  • Overview of the AIS, GIS assessment process
  • Creating optimal AIS designs
  • Creating optimal GIS designs
  • Creating optimal interfaces between the GIS and AIS portions of the substation
  • Including life-cycle costs (LCC) in AIS, GIS analyses
  • Case studies of AIS, GIS assessments
  • Myth Busters: addressing common perceptions about GIS

Bob Reymers, Key Account Manager, ABB

9:15 - 10:00 a.m. :: Design Considerations for Indoor GIS Substations

GIS substations have grounded metal enclosures that permits closer spacing of components than what is possible for a conventional air insulated substation (AIS). Due to reduced electrical clearances, gas insulated substaions permit a reduction in the footprint required for a GIS to about 25% of what's needed for a conventional substation. These factors make it possible to locate GIS substations inside of buildings, etc. This presentation covers the design considerations for indoor GIS substations and will also review two indoor GIS substation projects: one project is a 345kV GIS located in a commercial metropolitan area, and the second project is a 138kV GIS, located in a metropolitan downtown area.

Frank Shainauskas, Director of Engineering(Retired) - Power Delivery Services, Sargent & Lundy, LLC

10:00 - 10:15 a.m. :: Morning Break

10:15 - 11:00 a.m. :: Experience and Consideration for Selecting Outdoor GIS

Gas insulated substations are used where there is limited space, environmental concerns, or aesthetics. Due to the large clearances required for air insulated substations(AIS), their footprint is very large compared to SF6 insulated ones. Outdoor GIS can further reduce the space and cost of the installation. Locations where gas insulated substations are preferred include:

  • Large cities and towns
  • Underground stations
  • Substations and power stations located Offshore
  • Mountains and valley regions In this session, the considerations when selecting outdoor gas insulated substations will be discussed and evaluated.

J. Michael Hayden, National Sales Manager-Projects and International, Hitachi HVB, Inc.

11:00 a.m. - 12:30 p.m. :: Educational Tour: Anaheim GIS Substation

During this educational tour, attendees will have the opportunity to learn about the design, construction and operation of an urban GIS substation. Designed to build upon the morning classroom sessions, this working tour will provide for more in-depth discussion with the manufacturer, utility, and construction and engineering firms involved in the station's development. Attendees will examine:

  • Safety considerations for GIS substations
  • Urban construction considerations
  • Meeting city and local community requirements
  • Aesthetics and architectural design

Larry Davis, Capital Projects Manager, Anaheim Public Utilities

Joseph Wei, Electric System Planning Manager, Anaheim Public Utilities

12:30 - 1:00 p.m. :: Return to Hotel via Bus/Conference Adjourns

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