NG UKBP/TP 107 PDF

PURPOSE AND SCOPE

The health of the Transmission System is critically dependent upon correct relay settings. It is therefore essential that this process is adhered to both rigorously and diligently.

The purpose of this procedure is to define the management process for the preparation, application, verification, dissemination, recording and auditing of protection and control relay settings. This procedure defines both the Client side (i.e. National Grid) tasks, responsibilities and levels of surveillance, and the Contractor side tasks and responsibilities.

The procedure applies to all protection and control relays owned by National Grid, or for which National Grid has entered into an arrangement to carry out and hold the settings. The procedure is formatted on the basis that relay settings calculations will be carried out by UKBP/TP141 authorised Contractor engineers either as part of a capital scheme, or as part of ongoing support through a Post Delivery Support Agreement (PDSA).

It is recognised that for investments of medium and low complexity the full application of this Transmission Procedure (TP) may not provide the most cost efficient means of delivering that investment and hence TP governance options as per UKBP/TP500 Appendix A - Attachment A3 can be applied to this procedure.

TP governance options defined in UKBP/TP500 Appendix A - Attachment A3 include those that are already detailed in this Transmission Procedure and those that are additional and not detailed in this Transmission Procedure.

Amendments to this procedure shall be reflected in UKBP/TP500 Appendix A – Attachment A3 (if required) and may result in re-issue of UKBP/TP500 within the same period.

The scope of this procedure covers all protection and control equipment which require a setting, including associated equipment such as current transformers and facility selection functions. It covers the settings process associated with

• the capital programme

• maintenance & operations

• following equipment failure

• third party interfaces as required by the Grid Code

• setting changes requested by Market Operation