Gas Insulated Substations Conference

•  GIS Overview and Applications: Highlights GIS as a compact, reliable alternative to AIS, ideal for high-voltage urban and extreme environments.
• Key Specifications: Includes critical systems like Disconnecting Switch Cameras, Gas Density Monitoring with Partial Discharge Detection, and gas zone weight limits to ensure safety and operational efficiency.
• Technical Design Features: Covers Interlocking, Gas Tripping, Breaker Fail systems, and Local Control Cabinet (LCC) panels for enhanced control, monitoring, and safety.
• Installation & Commissioning Essentials: Emphasizes PD & HI-POT testing, transition systems for overhead and underground cables, and safety protocols to ensure seamless integration and operation.
• Operational Best Practices and Insights: Focuses on reliable maintenance, HI-Pot testing of connected cables, easy GIS component access, and environmental safeguards for long-term sustainability.

This presentation will review Dominion Energy’s medium voltage GIS projects covering multiple projects in different phases with details on some challenges along with solutions learned on implementing them successfully. Relatable differences and similarities between medium voltage GIS and high voltage GIS will be reviewed as well.

What are the steps for utility staff to take when engaging in GIS projects for the first time? This discussion will review what was learned by CenterPoint Energy when doing just that.  They had not done GIS for over 10 years and with most people involved in that project no longer with the company, that experience was gone. This presentation will give an overview of what was learned during this experience.

This overview will discuss two types of transitions involving GIS. First, the process and steps involved with transitioning from AIS to GIS will be discussed with a case study for increased resiliency and reliability. That transition will be followed by one for converting existing SF₆ GIS to SF₆ free options.

SF₆ has been an essential dielectric fluid for Transmission and Distribution switching equipment and high voltage switchgear for decades.  Despite all the technical advantages of SF₆ there is one shortcoming, that being environmental impact.  This presentation will provide an update on the status of ongoing research and development of new gases, gas mixtures and vacuum interrupter technologies, that have similar electrical properties and functionality to SF₆-filled equipment.  This presentation will also provide strategy considerations and impacts that SF₆ equipment users should understand, and it will discuss the application of these alternative technologies on the electric system.

In this presentation, we will talk about Clean Air GIS. As a very compact 72.5kV-50kA solution, the benefits of Clean Air GIS will be reviewed and compared to other GIS options.

In this insightful presentation, we will discuss implementing an urban located non-SF₆, 145kV, 63kA GIS. An overview of Clean Air High Voltage GIS developments and a comprehensive refresh about the solution will also be demonstrated by the speakers.

This session will review construction of the Mt. Vernon 230kV GIS substation and in-servicing as part of Pepco’s 10 miles of underground transmission network through the District of Columbia.

• Beginning the last phase of the Capital Grid with the start of construction at Champlain substation, which will have both 230kV and 69kV GIS.
• Capital Grid consists of one greenfield substation, rebuilding two existing substations, and converting an existing substation from 138kV to 230kV. All four substations utilize gas insulated switchgear and set up the framework for rebuilding our transmission system in the city.