Jan 2014
Electricity Transmission
EPRI Research Collaboration on Substations
NIA_NGET0157
Complete
Jan 2014
Jul 2015
National Grid Electricity System Operator and National Grid Electricity Transmission
Iliana Portugues
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Network Innovation Allowance
None
Asset Management, Transformers, Substations and Electricity Transmission Networks
£2,100,000.00

Transformer Life Management

(a) Maximising the diagnostic value of DGA through new gases

(b) Novel Sensor for Transformer Diagnostics

(c) The Copper Book (EPRI Power Transformer Guidebook)

(d) Transformer Remaining Life Research – New Markers

(e) Dissolved Gas Analysis Guide

(f) Transformer Forensics Database

Protection and Control

(a) Using Protective Relays for Condition Assessment: Catalogue the Enabling Technologies.

(b) Industry-wide Relay Performance Database: Data Format and Relay Performance Analysis.

(c) Standard-based Configuration Management for Protection & Control Systems.

SF6 Management and Gas Insulated Substations

Research on Sulphur hexafluoride (SF6) for breakers and Gas Insulated Substations / Gas Insulated Lines is focused on improving handling, enhanced diagnostics and reducing leaks. This project looks at the following areas:

1) Leak reduction technologies (both for sealing and for high sensitivity leak detection) are thus important to understand and effectively apply.

2) Research on diagnostics focuses on both gas analysis techniques and on partial discharge techniques (especially for GIS/GIL). Improved diagnostics remain vital since failure prevention of this highly critical equipment can significantly improve the reliability of electricity supply.

3) Research on handling issues such as live filling play an important role in increased worker safety.

Transformer Life Management 

(a)     Maximising the diagnostic value of DGA through new gases:

Develop new markers to better assess transformer risk of failure.  Deliver a methodology to guide National Grid to apply these new markers.  In addition, gather data on on-line DGA technologies and deliver data sets to allow for effective specification of DGA technologies to match the various situations and requirements.

(b)     Novel Sensor for Transformer Diagnostics

The objective is to deliver optical technologies to provide non-contact diagnosis of energized bushings.  Bushing failures can result in destruction of the associated transformer.  Failures can also pose a health and safety risk.  The objective is to assess bushing condition from a safe distance.

(c)     The Copper Book (EPRI Power Transformer Guidebook)

The objective is to provide a regularly updated comprehensive guidebook on transformer life managementt.

(d)     Transformer Remaining Life Research – New Markers

The objective is to provide a methodology on how better to assess transformer remaining life.  It will also produce guidelines to help National Grid request a set of specific analyses from laboratories and effectively interpret the results.

(e)     Dissolved Gas Analysis Guide

The objective is to provide a stand-alone, comprehensive guide on DGA (dissolved gas analysis) for power transformers – including guidance on specification of on-line analysis.

(f)      Transformer Forensics Database

The objective is to deliver a database on forensic teardowns and the diagnostic results – allowing analysis on how diagnostic predictions aligned with actual conditions.

Protection & Control

Relay mal-operations can adversely impact system operation and disrupt electric service. This project aims to develop new methodologies, processes, and tools to assist utilities in the efforts of reducing complexity, human error and cost in protection system maintenance and asset management, prevention of relay miss-operations through effective configuration management processes, improving reliability and sustainability of utility industry's mission-critical protection and control infrastructure.

SF6 Management and Gas Insulated Substations

Research on Sulphur hexafluoride (SF6) for breakers and GIS/GIL is focused on improving handling, enhanced diagnostics and reducing leaks. It does so delivering the following objectives:

  • Leak reduction technologies (both for sealing and for high sensitivity leak detection)
  • Research on diagnostics focusing on both gas analysis techniques and on partial discharge techniques (especially for GIS/GIL).
  • Improved diagnostics to significantly improve the reliability of electricity supply.
  • Research on handling issues such as live filling for increased worker safety.
Specific outputs for 2014, Transformer Life Management include:

  • Report reviewing how diagnostic value of DGA through new gases may be maximised.

  • Latest technology developments updated in the 2014 version of the Copper Book, a power transformer guidebook.

  • Report reviewing new markers for the determination of transformer remaining life.

  • Guidance on how to best to use dissolved gas analysis in transformers.

  • Report detailing the output from the development and testing of novel sensors for transformer diagnostics.

  • Software database with all transformer forensic studies done to-date and new data fields.

Specific outputs for 2014, Protection and Control include:

  • Industry wide Performance Database for Protective Relays.

  • Application Guidelines of Configuration Management for Protection and Control Systems.

  • Technologies and Application Guidelines for Condition Based Protection System Maintenance.

Specific outputs for 2014, SF6 Management and Gas Insulated Substations include:

  • Technical report detailing output of trials of SF6 Capture Technologies at Littlebrook substations.

  • Technical report describing Alternatives to SF6 Technology in Power Delivery: Status of Research

  • Gas Insulated Substations and Lines Guidebook detailing the whole life-cycle of SF6, GIS and GIL and specifically determining the following areas:
    • Top 4 Degradation Mechanisms and Potential Failure Modes

    • Aging, Corrosion, or Improperly Maintained Components of Switching Device Mechanism

    • Deterioration (Corrosion) of Flanges and O-rings

    • Tracking on the Surface of Spacers

    • Excessive Thermal Overload Operation of GIS Equipment