Version:- 5.2 Date of Issue:- Apr 2011 Page 1 of 11 NPS/003/019 Technical Specification for Electrical Insulating Fluids for use in Plant & Switchgear. 1. Purpose This specification details the technical requirements for electrical insulating fluids for use in plant and switchgear on the Northern Powergrid electrical distribution networks. This document supersedes the following document, all copies of which shall be destroyed. Ref Version Title NPS/003/019 4 Technical Specification for Electrical Insulating Fluids for use in Plant and Switchgear 2. Scope This specification includes for unused and reclaimed electrical insulating oil, and other fluids, for use in ground mounted and pole mounted, plant and switchgear on the Northern Powergrid electrical distribution networks It will also be necessary to consider and include any project specific requirements as detailed in Appendix 4, Addendum to Supplier Requirements. The following appendices form part of this technical specification. Appendix 1 - Technical Specification Sheet & Self Certification/Conformance Declaration Appendix 2 - Addendum to Supplier Requirements Appendix 3 - Technical Information Check List This specification excludes insulating fluids for use in cables and insulating fluids for use in capacitors.
Version:- 5.2 Date of Issue:- Apr 2011 Page 2 of 11 2.1 Contents 1. Purpose... 1 2. Scope... 1 2.1 Contents... 2 3. Technical Requirements... 3 3.1 Compliance with other Specifications and Standards... 3 3.2 Electrical Insulating and Cooling Fluid.... 3 3.2.1 Unused oil... 3 3.2.2 Reclaimed Oil... 3 3.2.3 Fluids for Use in Non-standard Situations.... 3 4. References... 4 4.1 External Documentation... 4 4.2 Internal documentation... 4 4.3 Amendments from Previous Version... 4 5. Definitions... 4 6. Authority for issue... 5 Appendix 1a Reclaimed Oil: Self Certification Conformance Declaration to BS148:2009... 6 Appendix 1b Unused Oil: Self Certification Conformance Declaration to BS EN 60296... 8 Appendix 2 Addendum to Supplier Requirements... 10 Appendix 3 Technical Information Check List... 11
Version:- 5.2 Date of Issue:- Apr 2011 Page 3 of 11 3. Technical Requirements 3.1 Compliance with other Specifications and Standards Technical documents referenced within this specification refer to the latest versions of the relevant International Standards, British Standard Specifications and all relevant Energy Networks Association Technical Specifications (ENA TS) current at the time of supply. 3.2 Electrical Insulating and Cooling Fluid. Unused or reclaimed electrical insulating oil may be utilised; it shall be: naphthenic, uninhibited, unpassivated, mineral oil. 3.2.1 Unused oil Oil shall be naphthenic, uninhibited, unpassivated mineral oil. It shall be: Transformer Oil, U, -30 C in compliance with the requirements of BS EN 60296: 2004: Fluids for electrotechnical application -Unused mineral insulating oils for transformers and switchgear. 3.2.2 Reclaimed Oil Oil shall be Naphthenic, uninhibited, unpassivated mineral oil complying fully with the requirements of BS148:2009: Reclaimed mineral insulating oil for transformers and switchgear, with the additional requirement that PCB content shall be minimised as far as practicable, but in any case shall be less than 10ppm. 3.2.3 Fluids for Use in Non-standard Situations. Unused or reclaimed electrical insulating oil as specified in 3.1 above shall be used for standard applications. Other fluids will be considered for special applications, for example where there is: unacceptable fire risk, environmental sensitivity or environmental risk. Other fluids may include synthetic oil, or vegetable based esters in accordance with BS EN 61099 and/or BS EN 60836; for example Midel 7131, Envirotemp FR3, Dow Corning 561, etc. These fluids shall be segregated from mineral insulating oil or different insulating fluids. Before use on the Northern Powergrid distribution networks these fluids must be assessed and its acceptability confirmed by the Northern Powergrid Standards and Assessment Manager.
Version:- 5.2 Date of Issue:- Apr 2011 Page 4 of 11 4. References The products described within this specification shall comply with all current versions of the relevant International Standards, British Standard Specifications and all relevant Energy Networks Association Technical Specifications (ENATS) current at the time of supply. 4.1 External Documentation Reference Title BS148:2009 Reclaimed Mineral Insulating Oil For Transformers And Switchgear - Specification BS EN 60296:2004 Fluids For Electrotechnical Applications - Unused Mineral Insulating Oils For Transformers And Switchgear BS EN 61099:2010 Specifications For Unused Synthetic Organic Esters For Electrical Purposes BS EN 60836:2005 Specifications For Unused Silicone Insulating Liquids For Electrotechnical Purposes 4.2 Internal documentation Reference Title NONE 4.3 Amendments from Previous Version Section Amendments 2.0 Scope extended to include details about supporting appendix documents 3.1 This clause has been revised and renumbered to detail the relevance of referenced documents 3.1 & 3.2 The existing clause 3.1 & 3.2 has been renumbered 6 The authority for issue appendix has been edited to remove the policy sponser requirement Appendix 1A & 1B Text description changes in the test clause column Appendix 2 Addendum to suppliers requirements section created Appendix 3 Technical information checklist added 5. Definitions Term Definition NONE
Version:- 5.2 Date of Issue:- Apr 2011 Page 5 of 11 6. Authority for issue 6.1 Author I sign to confirm that I have completed and checked this document and I am satisfied with its content and submit it for approval and authorisation. D Blackledge Plant & Switchgear Standards Manager Sign Date D Blackledge 12/04/2011 6.2 Technical Assurance I sign to confirm that I am satisfied with all aspects of the content and preparation of this document and submit it for approval and authorisation. Sign Date G Hammel Overhead Standards Manager G Hammel 14/04/2011 6.3 DBD Assurance I sign to confirm that this document has been assured for issue on to the DBD system Sign Date S Johnson DBD Administrator S Johnson 14/04/2011 6.4 Approval Approval is given for the content of this document C Holdsworth Standards and Assessment Manager Sign Date C Holdsworth 12/04/211 6.5 Authorisation Authorisation is granted for publication of this document Sign Date M Nicholson Head of System Strategy M Nicholson 13/04/2011
Version:- 5.2 Date of Issue:- Apr 2011 Page 6 of 11 Appendix 1a Reclaimed Oil: Self Certification Conformance Declaration to BS148:2009 BS148:2009 Clause Requirement Conformance and Details 3.1 - additive List any additives and quantities/proportions 3.4 passivator Unpassivated 3.10 uninhibited oil Uninhibited 4.1 Tanker wagons and drums List vessels used and detail cleaning procedures for each 4.2 Marking of vessels List vessels used and detail vessel marking for each: Minimum a and b markings per BS148 2009 4.3 Accompanying documentation 4.4 - Health & Safety information 5 - Sampling (Procedure per BS5263:1975) 6 Properties of the oil Table 1 of BS148 2009) Appearance test Clause 7.1 Density at 20 C Clause 7.2 Kinematic viscosity test 40 C 15 C Clause 7.3 Flash point test Clause 7.4 Pour point test Clause 7.5 Neutralisation value test Clause 7.6 Corrosive sulphur test Clause 7.7 Passivator content test Clause 7.8 Water content test Bulk delivery Drum delivery Clause 7.9 Provide samples of documentation: Minimum a, b, c statements per BS148 2009 Provide COSHH data sheets, etc. Top AND bottom samples shall be taken and analysed and results supplied to CEEUK. Oil shall be additive-free uninhibited, unpassivated and within limiting values Clear, free from sediment and suspended matter. <= 0.895kg/dm 3 <= 13mm 2 /s <= 800 mm 2 /s >= 135 C <= -30 C <= 0.03 mg KOH per g of oil Non-corrosive Not detectable <= 20mg/kg <= 30mg/kg
Version:- 5.2 Date of Issue:- Apr 2011 Page 7 of 11 BS148:2009 Clause Requirement Conformance and Details Anti-oxidant additives test Not Detectable Clause 7.10 Oxidation stability test 164 hr Clause 7.11 Total acidity <= 1.2mg KOH per g of oil Sludge <= 0.8% by mass Breakdown voltage test as delivered >=30kV Clause 7.12 Dielectric dissipation factor Clause 7.13 Total PCB content test Clause 7.14 Total furans test Clause 7.15 Gassing Tendency at 50 Hz after 120 min,. Method A <= 0.005 at 90 C and 40 Hz to 62 Hz < 10mg/kg < 0.2 mg/kg <= 10 mm 3 /min
Version:- 5.2 Date of Issue:- Apr 2011 Page 8 of 11 Appendix 1b Unused Oil: Self Certification Conformance Declaration to BS EN 60296 IEC60296 Clause Requirement Conformance and Details 1 - Unused oil Confirm oil is Unused oil 3.3 - Additives Northern Powergrid require additive free oil. List any additives and quantities/proportions 5.1.1 Class Transformer oil 5.1.2 - Inhibitor content Uninhibited: U 5.1.3 Lowest cold start -30 C energising temperature (LCSET) 5.4 Identification and delivery a) vessels clean and suitable b) vessel marking a) List vessels used and detail cleaning procedures for each b) List vessels used and detail vessel marking for each c) accompanying c) Provide samples of documentation documentation 5.5 - Sampling Top AND bottom samples shall be taken (procedure per IEC 60475) and analysed and results supplied to Northern Powergrid. 6 Properties of the oil Oil shall be additive-free uninhibited, unpassivated and within limiting values per Tables 1 and 2 BS EN 60296: 2004 Viscosity test at 40 C Max. 12 mm 2 /s ISO 3104 Viscosity test at 30 C Max. 1 800 mm 2 /s ISO 3104 Pour point test Max. 40 C ISO 3016 Water content test =< 30 mg/kg (bulk supply) IEC 60814 =< 40 mg/kg (drums) Breakdown voltage test Min. 30 kv / 70 kv IEC60156 Density test at 20 C Max. 0,895 g/ml ISO 3675 or ISO12185
Version:- 5.2 Date of Issue:- Apr 2011 Page 9 of 11 IEC60296 Clause Requirement Conformance and Details DDF Test at 90 C Max. 0,005 ISO 60247 or IEC 61620 Appearance Clear, free from sediment and suspended matter Acidity test Max. 0,01 mgkoh/g IEC 62021-1 Interfacial tension test Min. 40mN/m ISO 6295 Total sulphur content test No general requirement BS 2000 part 373 or ISO 14596 Corrosive sulphur test DIN 51353 Non-corrosive per IEC 62535:2008 Antioxidant additive test IEC 60666 (U) uninhibited oil: not detectable 2-Furfural content test Max. 0,1 mg/kg IEC 61198 Oxidation stability test (U) Uninhibited oil: 164 h IEC 61125 (method C) Total acidity Max. 1,2 mg KOH/g Sludge Max. 0,8 % DDF at 90 C test Max. 0,500 IEC60247 Gassing test IEC 60628, A <= +5mm 3 /min at 50 Hz after 120 minutes Flash point test Min. 135 C ISO 2719 PCA content test Max. 3 % BS2000 part 346 PCB content test IEC 61619 Not detectable
Version:- 5.2 Date of Issue:- Apr 2011 Page 10 of 11 Appendix 2 Addendum to Supplier Requirements To be completed for each project requiring a non-standard insulating fluid
Version:- 5.2 Date of Issue:- Apr 2011 Page 11 of 11 Appendix 3 Technical Information Check List The following information shall be provided by the supplier for technical review by Northern Powergrid. Additional information shall be provided if requested. Requirement Full product descriptions and part number/reference Appendix 1a completed self certification conformance declaration for reclaimed oil Appendix 1b completed self certification conformance declaration for unused oil Technical data sheets COSHH Data sheets Type test evidence Routine sampling test plan Packaging/delivery information Provided (Y/N)