IEC 62568-2015 pdf free download.Overhead lines – Method for fatigue testing of conductors.
51.6 ExcitatIon fr.qu.ncy
The frequency of excitation shall be ire the range of (10 to 60) Hz
5.2 Test parameters for resonance type benches The following parameters shall be monitored:
– bending amplitude
— antinode amplitude
– frequencyf
— conductor mechanical tension 7’
— number of cycles
— each occurrence of wire failure and the correspondIng number of cycles .S,
5.3 T.rminallen of a t.st
The test shall be terminated when a predetermined number of wire failures j ii recorded or when the test has reached N = 500 Mc.
At the end of each test, the clamp region of the conductor shall be dissected and the number of wire failures found shall correspond to the number of failures recorded by the wire failure detector. If the results cannot be reconciled, the test shall be diScarded.
5.4 Number of tests
A malmum of 12 tests shall be performed to determine the endurance limit Of I conductorlclamp system. Three of these tests shall be at an amplitude that shall produce no wire failure up to 500 Mc The vibration amplitude of the other nine tests shall be determined in order to distribute, as evenly as possible, the wire failures between (0,8 and 500) Mc
IEC 62568 2C1 50 IEC 2015
6 Test results
The following information shaM provided in port for ench teat
— the failure criterion used
– number of cycles corresponding to wire failure(s) N1
– number of cycles N completed th.r. was no failure
— mapping of the wire failure locations in the transverse and the longitudinal planes with respect to the support clamp
— frequency f. antinode amplitude ‘max and, the resulting fatigue Indicator bending amplitude l
— conductor mechanical tension 7’
— SIN diagram of the Idealized bendIng stress t7gObI using the Potfenberger.Swart relatjonship (see A72)
— S/N diagram of the idealized dynamic stress (see A,7.2)
– Th. dnduranca limits n5g15) and correspond to lli• maximum vibration amplitude under which the conductor has experienced no fatigue damage up to 500 Mc.IEC 62568 pdf download.