MGM/an/SC-7/Apr.’95 ESKOM SPECIFICATION REFERENCE REV ESKSCAAD0 4 PAGE 1 OF 14 TITLE: SPECIFICATION FOR CONTINOUS ANALOGUE DATE: JUNE 1995 INDICATING INSTRUMENTS FOR ELECTRICAL REVISION DATE: QUANTITIES JUNE 1998 ------------------------------------------------------------------------------------------------------------------------COMPILED BY FUNCTIONAL RESP. AUTHORIZED BY ......................... ............................................ ............................. J Belgrove T N Carolin R Dabengwa Measurement Stds WG N M & C Man ED (E) ----------------------------------------------------------------------------------------------------------------------This document has been seen and accepted by B T Crookes J A de Beer P A Faling Executive Director (Generation) Executive Director (Technology) Executive Director (Transmission) CONTENTS PAGE 1 Scope ................................................................................................. 2 2 Normative references ......................................................................... 2 3 Definitions ........................................................................................... 2 4 Requirements ..................................................................................... 2 4.1 4.2 4.3 4.4 4.5 General ........................................................................................ Instruments .................................................................................. Standard information ................................................................... Drawings ...................................................................................... Instruction manuals ...................................................................... 2 2 3 3 3 Tests .................................................................................................. 4 5 Annexes A Schedules A and B ............................................................................. 5 B Deviation schedule ............................................................................. 12 C Revision information ........................................................................... 13 SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 2 OF 14 ------------------------------------------------------------------------------------------------------------------------- 1 Scope This specification details Eskom’s requirements for all a.c. and d.c. indicating instruments. 2 Normative references The following documents shall be read in conjunction with this specification. However, in cases of conflict, the provisions of this specification shall take precedence. IEC 51-1: 1984, Direct acting indicating analogue electrical measuring-instruments and their accessories. Part 1: Definitions and general requirements common to all parts. IEC 51-2: 1984, Direct acting indication analogue electrical measuring-instruments and their accessories. Part 2: special requirements for ammeters and voltmeters. IEC 51-8: 1984, Direct acting indication analogue electrical measuring-instruments and their accessories. Part 8: special requirements for accessories. IEC 51-9: 1988, Direct acting indication analogue electrical measuring-instruments and their accessories. Part 9: recommended tests methods. DIN 43700, Measurement and control instruments for panel mounting. DIN 43802-2: 1991, Line scales and pointers for indicating electrical measuring instruments; general requirements. DIN 43802-3: 1991, Line scales and pointers for indicting electrical measuring instruments; designs and dimensions. DIN 43802-4: 1991, Line scales and pointers for indication electrical measuring instruments; scale graduation and numbering. ESKASAAN7, Environmental requirements and tests for electronic measuring equipment. 3 Definitions Not applicable 4 Requirements 4.1 General 4.1.1 Nothing in this specification shall lessen the contractor’s obligations detailed in any other documents forming part of a contract. 4.2 Instruments 4.2.1 Indicating instruments are required for the continuous indication of electrical quantities. 4.2.2 Indicating instruments will be mounted on various panels and mimic boards to be supplied by Eskom. SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 3 OF 14 ------------------------------------------------------------------------------------------------------------------------- 4.2.3 Instruments shall be contained in dustproof cases. 4.2.4 The glass front of the instrument shall be resistant to electrostatic build up. 4.2.5 Instruments shall be provided with an accessible zero adjustment screw where applicable. 4.2.6 The instrument movement and its integral mounted dial shall be easily removable from the instrument case for maintenance purposes. 4.2.7 The dial shall be firmly secured. 4.2.8 The step input response of the instruments shall be critically damped. 4.2.9 The calibration shall not be affected by stray magnetic fields. 4.2.10 Where blank dials are required, they shall be supplied with a matt-white finish. 4.2.11 If scaled dials are required, scaling shall be in accordance with DIN 43 802 for coarse scales. 4.2.12 The instrument shall be checked, calibrated and, if required, scaled by the Engineering Department of the Distributor concerned. 4.3 Standard information The following information shall be imprinted, in standard IEC symbols but positioned as specified in DIN 43 802, on all instrument scales: — — — — — type mounting angle accuracy class test voltage alternating current or direct current. 4.4 Drawings Three copies of all manufacturer’s drawings shall be supplied. On approval, one complete set of transparencies or microfilm of the drawings shall be supplied to Eskom. 4.5 Instruction manuals Copies of spare parts lists and instruction manuals, in quanitities specified in schedule A, of the enquiry document, in English giving sufficient calibrating details to enable Eskom staff to maintain and check the instruments, shall be supplied before delivery of the equipment. One additional set of the above shall be supplied with the equipment on delivery. 5 Tests SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 4 OF 14 ------------------------------------------------------------------------------------------------------------------------- 5.1 The instruments shall be type tested in accordance with the specification relevant to that instrument type. 5.2 The manufacturer shall, at his works, perform routine tests. 5.3 Three copies of certificates, detailing the results of all type tests, shall be provided by the manufacturer prior to delivery of the equipment. Annex A SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 5 OF 14 ------------------------------------------------------------------------------------------------------------------------- (informative) Schedules A and B The schedules A and B in this annex are included in this document for information only: they are intended to be guides to purchasers, in the areas of format and Eskom’s specific technical requirements, to help them to prepare schedules which are applicable to a particular enquiry or tender. Annex A SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 6 OF 14 ------------------------------------------------------------------------------------------------------------------------- (informative) Schedule A: Eskom’s particular requirements Schedule B: Guaranteees and technical particulars of equipment offered ITEM DESRIPTION 1 Direct and CT operated moving iron ammeters SCHEDULE A 1.1 Required for measuring 1.2 Manufacturer — 1.3 Manufacturer’s type reference — 1.4 Full scale deflection specify 1.5 — 1,5 A — 7,5 A — other Movement deflection specify 1.6 — 90°/240° [60 % of rated value at half scale] Instrument zero on the left 1.7 Deflection direction 1.8 Case size-square pattern — — — — — amperes at 50 Hz clockwise 48 mm 72 mm 96 mm 144 mm other 1.9 Accuracy class 1.10 Scales 1,5 — blank — DIN 43 802 (coarse) 1.11 Suspension type pivot & jewel taut band Annex A (continued) SCHEDULE B SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 7 OF 14 ------------------------------------------------------------------------------------------------------------------------- Schedule A: Eskom’s particular requirements Schedule B: Guaranteees and technical particulars of equipment offered ITEM DESRIPTION 1.12 Mounting angle with respect to horizontal SCHEDULE A specify — 90° — 0° — other 1.13 Terminal to case withstand voltage 2 kv for 1 minute 1.14 Burden to be less than 1 VA 1.15 Continuous maximum rating not less than 2 x FSD 1.16 Short term overload 10 times rated current for 3 seconds 1.17 Special scaling requirements specify 1.18 Instrument glass 2 — non-reflective — other Moving coil ammeters 2.1 Required for measuring 2.2 Manufacturer — 2.3 Manufacturer’s type reference — 2.4 Scale deflection D.C. amperes specify — 0 mA to 1mA — 1 mA to 0 mA to 1 mA — other Annex A (continued) Schedule A: Eskom’s particular requirements SCHEDULE B SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 8 OF 14 ------------------------------------------------------------------------------------------------------------------------- Schedule B: Guaranteees and technical particulars of equipment offered ITEM 2.5 DESRIPTION Movement deflection SCHEDULE A SCHEDULE B specify — 90° — 240° 2.6 Instrument zero — on the left — centre scale 2.7 Deflection direction for positive current clockwise 2.8 Case size-square pattern — — — — — 48 mm 72 mm 96 mm 144 mm other 2.9 Accuracy class 1,5 2.10 Deflection linear 2.11 Scales — blank — DIN 43 802 (coarse) 2.12 Suspension type pivot & jewel taut band 2.13 Mounting angle with respect to horizontal specify — 90° — 0° — other 2.14 Terminal to case withstand voltage. 2 kV for 1 minute 2.15 Continuous maximum rating not less than 2 x FSD 2.16 Short term overload 10 x rated current for 3 seconds Annex A (continued) Schedule A: Eskom’s particular requirements Schedule B: Guaranteees and technical particulars of equipment offered SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 9 OF 14 ------------------------------------------------------------------------------------------------------------------------- ITEM DESRIPTION 2.17 Instrument internal resistance 2.18 Instrument glass SCHEDULE A SCHEDULE B specify — non-reflective — other 3 Direct and VT operated moving iron voltmeters 3.1 Required for indicating volts at 50 Hz 3.2 Manufacturer — 3.3 Manufacturer’s type reference — 3.4 Full scale deflection specify 3.5 — 150 volt — other Movement deflection angle specify — 90°/240° [60 % of rated value at half scale] 3.6 Instrument zero on the left 3.7 Deflection direction clockwise 3.8 Case size-square pattern — — — — — 48 mm 72 mm 96 mm 144 mm other 3.9 Accuracy class 1,5 3.10 Scales specify — blank — DIN 43 802 (coarse) Annex A (continued) Schedule A: Eskom’s particular requirements Schedule B: Guaranteees and technical particulars of equipment offered SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 10 OF 14 ------------------------------------------------------------------------------------------------------------------------- ITEM DESRIPTION SCHEDULE A 3.11 Suspension type pivot & jewel taut band 3.12 Mounting angle with respect to horizontal specify SCHEDULE B — 90° — 0° — other 3.13 Terminal to case withstand voltage 0V to 500 V 2kV Over 500 V 2 x rated voltage + 1000 V for 1 minute 3.14 Short term overload 2 x rated voltage for 10 seconds 3.15 Burden to be less than 5 VA 3.16 Continuous maximum rating not less 1,2 x FSD than Instrument glass 3.17 — non-reflective — other 4 Moving coil voltmeters 4.1 Required for measuring 4.2 Manufacturer — 4.3 Manufacturer’s type reference — 4.4 Basic movement ohms per volts a.c./d.c. volts specify — 1 000 Ω — other Annex A (continued) Schedule A: Eskom’s particular requirements Schedule B: Guaranteees and technical particulars of equipment offered SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 11 OF 14 ------------------------------------------------------------------------------------------------------------------------- ITEM DESRIPTION 4.5 Nominal input 4.6 — 50 V — 110 V — 220 V — other Movement deflection SCHEDULE A SCHEDULE B specify — 90° — 240° 4.7 Instrument zero on the left 4.8 Deflection direction clockwise 4.9 Case size-square pattern — — — — — 48 mm 72 mm 96 mm 144 mm other 4.10 Accuracy class 1,5 4.11 Scales 4.12 — blank — DIN 43 802 (coarse) Suspension type 4.13 Mounting angle with respect to horizontal pivot & jewel taut band specify — 90° — 0° — other 4.14 Terminal to case withstand voltage 0V to 500 V Over 500 V 2 x rated voltage + 1000 V for 1 minute Annex A (concluded) Schedule A: Eskom’s particular requirements Schedule B: Guaranteees and technical particulars of equipment offered SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 12 OF 14 ------------------------------------------------------------------------------------------------------------------------- ITEM 4.15 DESRIPTION SCHEDULE A Instrument glass — non-reflective — other 4.16 Continuous maximum rating 1,2 x FSD 4.17 Short term overload 2 x rated voltage for 10 seconds Annex B (informative) DEVIATION SCHEDULE SCHEDULE B SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 13 OF 14 ------------------------------------------------------------------------------------------------------------------------1 Any deviations/modifications/alternatives offered to standard specification ESKSCAAD0 shall be listed below with reasons for the departures. 2 No deviations/modifications/alternatives offered to the specification will be recognized unless on this schedule. 3 If no deviations/modifications/alternatives are offered, this schedule must be marked N/A SPECIFICATION/ SCHEDULE PAGE NUMBER SPECIFICATION/ SCHEDULE CLAUSE NUMBER PROPOSED DEVIATION/MODIFICATION/ALTERNATIVE Annex C Revision information SPECIFICATION FOR CONTINUOUS ANALOGUE INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES REFERENCE REV ESKSCAAD0 4 PAGE 14 OF 14 ------------------------------------------------------------------------------------------------------------------------DATE REV NO NOTES Mar.’87 4 Document NWS 1307 Rev 4 issued. Apr.’95 4 NWS 1307 re-numbered and re-formatted in accordance with the Eskom documentation system. No changes. Revision remains Rev 4.