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Protection and Control of Network Transformers Standard R246242 Version 3.0, May 2018

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Protection and Control of Network Transformers Standard R246242 Version 3.0, May 2018 Standard Protection and Control of Network Transformers Standard R246242 Version 3.0, May 2018 Tasmanian Networks Pty Ltd (ABN 24 167 357 299) Authorisations Action Name and title Date Prepared by Anthony Januba, Senior Asset Strategy Engineer 17/05/2018 Reviewed by Stewart Collins, Senior Asset Strategy Engineer 18/5/2018 Authorised by Robert Smith, Secondary Asset Strategy Team Leader 24/05/2018 Review cycle 30 months Responsibilities This document is the responsibility of the Asset Strategy Team, Tasmanian Networks Pty Ltd, ABN 24 167 357 299 (hereafter referred to as "TasNetworks"). Please contact the Asset Strategy Leader with any queries or suggestions. • Implementation All TasNetworks staff and contractors. • Compliance All group managers. Minimum Requirements The requirements set out in TasNetworks’ documents are minimum requirements that must be complied with by all TasNetworks team members, contractors, and other consultants. The end user is expected to implement any practices which may not be stated but which can be reasonably regarded as good practices relevant to the objective of this document. © Tasmanian Networks Pty Ltd 2014 Tasmanian Networks Pty Ltd (ABN 24 167 357 299) Protection and Control of Network Transformers Standard Record of revisions Section number Details Document transferred to new TasNetworks template 1.4 Section modified for precedence of project specification over this standard 3.1 499A and 499B protection relays functional requirements 5.6 Table 1 for Network transformer thermal limits removed Page 3 of 18 Protection and Control of Network Transformers Standard Table of contents Authorisations...............................................................................................................................................2 Responsibilities............................................................................................................................................. 2 Minimum Requirements...............................................................................................................................2 1.....................................................................................................................................................General 7 1.1..................................................................................................................................Purpose 7 1.2..........................................................................................................................................Scope 7 1.3................................................................................................................................Objective 7 1.4............................................................................................................................ Precedence 7 1.5.........................................................................................................................Abbreviations 8 1.6.............................................................................................................................References 8 1.7..........................................................................................................TasNetworks standards 8 1.8...........................................................................................................TasNetworks drawings 8 2................................................................................................................................................Philosophy 9 2.1..................................................................................................................Design philosophy 9 3..........................................................................................................................Functional requirements 9 3.1........................................................................Protection and control scheme arrangement 9 3.1.1..........................................................................................................499A Protection relay 10 3.1.2..........................................................................................................499B Protection relay 11 3.1.3...................................................................................................................590 AVR Device 11 3.2..........................................................................................Transformer protection functions 12 4..............................................................................................................................Protection application 13 Page 4 of 18 Protection and Control of Network Transformers Standard 4.1......................................................................................... General application requirements 13 4.2............................................................... Tertiary winding earth fault protection application 13 4.2.1..........................................................................................Distance protection application 13 4.2.2.......................................................Biased transformer differential protection application 14 4.2.3.....................................................................................Over-fluxing protection application 14 4.2.4.............................................Low impedance restricted earth fault protection application 14 4.2.5............................................................................................................Buchholz protection 14 4.2.6........................................................................................................Check Synchronisation 15 4.2.7..............................................................................................Over temperature protection 15 4.3...............................................................Circuit breaker failure (CBF) protection application 15 4.4......................................................................Automatic voltage regulator (AVR) application 15 4.5.............................................................................Blocking of CB open and close commands 15 5................................................................................................................Protection and control settings 16 5.1..............................................................................Delta tertiary winding protection settings 16 5.2.................................................................................................. Distance protection settings 16 5.3...................................................................................Biased differential protection settings 16 5.4....................................................................Circuit breaker failure (CBF) protection settings 17 5.5.............................................................................................Over-fluxing protection settings 17 5.6....................................................................................Thermal overload protection settings 17 5.7..............................................................................Restricted earth fault protection settings 17 5.8..............................................................................................Check Synchronisation settings 17 5.9...................................................................................Over temperature protection settings 17 Page 5 of 18 Protection and Control of Network Transformers Standard 5.10.........................................................................Automatic voltage regulator (AVR) settings 17 Appendix 1 – Standard secondary equipment...........................................................................................19 Page 6 of 18 Protection and Control of Network Transformers Standard 1 General 1.1 Purpose The purpose of this document is to define the requirements, philosophy and the application of protection and control schemes for network transformers in the Tasmanian interconnected power system under the responsibility of Tasmanian Networks Pty Ltd (hereafter referred to as “TasNetworks”). 1.2 Scope This standard applies to all network transformer protection and control schemes under the responsibility of TasNetworks where the network transformer is connected to the following busbar configurations: (a) Single busbar. (b) Double or triple busbar. (c) Double breaker in the diameter between two main busbars. (d) Circuit breaker and a half in the diameter between two main busbar. This standard contains requirements for design and is to be applied on new installations as well as redevelopment of part or all existing installations where the busbar arrangement may consist of a combination of the above mentioned configurations. 1.1 Objective TasNetworks requires designs as covered in this standard to ensure: (a) personnel and public safety; (b) safety of TasNetworks’ assets; (c) reliability and continuity of power supply to the power transmission network; (d) that relevant Australian legal requirements are met; (e) that the requirements of the National Electricity Rules are met; (f) ease in operation and maintenance; (g) minimum disruption to the EHV supply system following a fault; (h) that the requirements of TasNetworks’ corporate plan are met; and (i) that the exposure of TasNetworks’ business to risk is minimised. 1.1 Precedence Any apparent conflict between the requirements of this standard and the law, mandatory requirements,
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