IEC 60051-5-2017 pdf free

IEC 60051-5-2017 pdf free.Direct acting indicating analogue electrical measuring instruments and their accessories – Part 5: Special requirements for phase meters, power factor meters and synchroscopes.
This part of lEG 60051 applies to direct acting indicating phase meters, power factor meters and synchroscopes having an analogue display.
This document also applies to non-interchangeable accessories (as defined in 3.1.23 of lEG 60051-1:2016) used with phase meters, power factor meters and synchroscopes.
This document also applies to a phase meter or power factor meter whose scale marks do not correspond directly to its electrical input quantity, provided that the relationship between them is known.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
lEG 60051-1 :20 16, Direct acting indicating analogue electrical measuring instruments and their accessories — Part 1: Definitions and general requirements common to all parts
3 Terms and definitions See IEC 60051-1:2016.
5 Requirements
5.1 Reference conditions
See IEC 60051-1 :2016. The reference value of the influence quantities should be as given in Table 2 of EC 60051-1:2016 and Table 1.
5.2 Limits of intrinsic uncertainty, fiducial value
5.2.1 LImits of Intrinsic uncertainty See lEC 60051-1:2016.
For a synchroscope, the accuracy requirements apply only at the synchronizing mark.
5.2.2 Correspondence between intrinsic uncertainty and accuracy class See lEG 60051-1:2016.
5.2.3 Fiducial value
The fiducial value corresponds to a phase angle of 90°.The class index is marked using symbol E-1 given in Table 6 of IEC 60051-1:2016 (see Clause 6 of IEC 60051-1:2016).
5.3 Nominal range of use and variations
5.3.1 Nominal range of use
See lEG 60051-1:2016. The limits of the nominal range of use for influence quantities shall be as given in Table 3 of IEC 60051-1:2016 and Table 2.
5.3.2 Limits of variations See IEC 60051-1:2016 and Table 2.
5.3.3 CondItions for the determination of variations See lEG 60051-1:2016.
5.4 Operating uncertainty, overall system uncertainty and variations See IEC 60051-1:2016.
5.5 Electrical requirements
5.5.1 Electrical safety requirements See lEG 60051-1:2016,
5.5.2 Self-heating
See lEG 60051-1:2016.
However, the requirements of IEC 60051-1:2016 do not apply to synchroscopes.
5.5.3 Permissible overloads
5.5.3.1 Continuous overload
For the recommended test, see IEC 60051 -9.
All phase meters and power factor meters, together with their non-interchangeable accessory(ies), if any, except for instruments fitted with a non-locking switch, shall be subjected to a continuous overload of 120 % of the rated value for all current circuits simultaneously for a period of 2 h.
After having cooled to the reference temperature, the instrument, together with its non-interchangeable accessory(ies), if any, shall comply with its accuracy requirements but without repeating the overload.
The continuous overload test shall be carried out under reference conditions except for current.
The requirements for continuous overload do not apply to synchroscopes.IEC 60051-5 pdf free download.