IEC 62499:2008 pdf free download

IEC 62499:2008 pdf free download Railway applications – Current collection systems – Pantographs, testing methods for carbon contact strips
1 Scope
This International Standard gives rules for testing methods for carbon contact strips. Thepurpose of this standard is to demonstrate that the carbon contact strip construction, byattachment to integral supporting structure (carrier) but excluding bolted assembly,is fit forpurpose.Not all tests may be relevant to some designs.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
None.
3Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
carbon contact strip
strip of carbon material,permanently attached to an integral supporting structure (carrier) butexcluding bolted assembiies
3.2
shear strength
stress at failure of the adhesion between carbon and the support structure
3.3
autodrop detection sensor
mechanism incorporated in the carbon contact strip to provide the indication for thepantograph automatic dropping device(ADD)
3.4
flow continuity
uninterrupted flow of air or other fluid
3.5
rated current loading
current value defined by the manufacturer that the carbon strip is designed to sustain withoutdegradation under the specified operating conditions
4symbols and abbreviationsAdesigned area of adhesion (mm2)
Fsshear force (N)
R resistance (Ω)
Τ s shear strength (N/mm 2 )
5 Tests
5.1 General
There are two categories of tests:
– type tests,
– routine tests.
The above tests are described in 5.1 .1 to 5.1 .2.
Supplementary tests may be required if they have been specified in the customer specification and after agreement with the supplier.
Annex A summarises the tests which shall be performed.
5.1.1 Type tests
Type tests shall be performed on a single piece of product of a given design.
Equipment in current manufacture shall be considered to have satisfied the type tests; if the manufacturer can provide certified reports of type tests already conducted on identical components, the type tests shall be considered to be complied with.
5.1.2 Routine tests
Routine tests shall be carried out to verify that the properties of a product correspond to those measured during the type test. Routine tests shall be performed by the supplier on each equipment.
5.2 Test procedures
5.2.1 Tests for the temperature characteristic of the carbon contact strip under rated current loading
5.2.1 .1 General
The test aims to determine the temperature characteristic to stability of the carbon contact strip at the maximum designed current loading.
5.2.1 .2 Test method
The carbon contact strip shall be fixed at one end and freely supported at the other end (see Figure 1 ). The current supply connection shall be made by clamping suitable interfaces to the vertical faces of the carbon, but not in contact with the carrier material (see Figure 2). The current take off shall be made at the normal design interface(s) between the carrier and the pantograph.