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Asset replacement and new connections on the electricity transmission system require Overhead Line (OHL) reconfiguration and/or re-conductoring. System reconfiguration and new generation connections result in changes to system fault levels which warrant protection setting review. The paper describes the approach adopted by National Grid to determine the requirement for protection setting re-calculation...
This paper investigates a number of design, operation and lifetime management experiences of feeder unit protection systems installed on National Grid Electricity Transmission (NGET) UK networks. The paper will consider the policy, application design and operational experiences under the following categories in particular since the move to numeric protection: Policy and application design SDH communication...
This paper investigates a number of design, operation and lifetime management experiences of transformer protection systems installed on National Grid Electricity Transmission (NGET) networks. The paper will consider the policy, application design and operational experiences under the following categories particularly since the move to numeric protection: Policy and application design Operational...
The project to install new cables in the Woodhead Tunnel forming part of National Grid's (NGET) 400kV transmission system running across the Pennines, requires a state of the art cable monitoring and protection system. The availability of IEC61850 offers the opportunity to provide a simple but effective system in an early long haul application.
National Grid has been installing Numerical Busbar Protection (BBP) systems at its 400kV, 275kV and 132kV double busbar substations for approximately ten years. This Paper investigates the design, operational and lifetime management experiences/challenges associated with moving to these solutions. The paper will consider these challenges under the following five categories:- ▪ Policy and application...
Historically, the application of delayed auto-reclose and synchronising at mesh design substations has proven technically challenging, necessitating a bespoke and complex solution to providing this functionality. Coincident with the emergence of multifunctional relay- based solutions, circa 2000, National Grid recognised that both its asset replacement programme, and the expansion of the transmission...
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