BS/EN 62631-3-3-2016 pdf download.Dielectric and resistive properties of solid insulating materials
Part 3-3: Determination of resistive properties (DC methods) — Insulation resistance (IEC 62631-3-3:2015).
The sheet materials shall measure 60 mm x 15 mm x sheet thickness (see Figure 1 and Figure 3).
5.5.2.2 Pipes, bars and rods
These shall comprise 60 mm long sections from the cross-section of the product (see
Figure 1).
In the case of pipes, at larger outer diameters than 110mm, subsections 60 mm x 15 mm x wall thickness may be cut from the pipe. In case of doubt, the measurement should be carried out on the complete pipe.
5.5.2.3 Any other shapes
Specimen shall be taken as appropriate.
5.5.3 Test specimen for insulating resistance between bar electrodes
5.5.3.1 Tapes, strips and thin rods
These shall comprise> 50 mm long sections. ≤ 25,5 mm in width, cut from the product.
5.5.3.2 Any other shapes
Specimen shall be taken as appropriate.
5.5.4 Manufacturing of test specimen
The removal, production and shape of the test specimen shall be determined by the relevant standards for the material. During removal and production of the specimen the condition of the material shall not be changed and the specimen removed shall not be damaged.
If the surface of the test specimen is machined at the contact areas of the electrodes, the type of machining shall be specified in the test report. The test specimen shall have a geometrically simple shape (plate with parallel measuring areas, cylinder etc.).
In case of insulating resistance between tapered pin electrodes, the necessary holes shall be drilled with a diameter of 5 mm of the driller. For reinforced materials a driller made from sintered metal may be useful.
Specimen from products shall be prepared with the product thickness, if possible
If not otherwise stipulated, no cleaning of the test specimen shall be done. Any additional contamination shall be avoided.
5.6 Electrode application
5.6.1 ApplicatIon of tapered pin electrodes
5.6.1.1 General
Two metal taper pins of Type A — 5 x 50 (diameter of 5 mm and taper 1:50). according to
Iso 2339. arranged in parallel, shall be used as plug electrodes.
Unless otherwise specified, two continuous holes with a diameter of 5 mm and (25 ± 1) mm between the centres shall be drilled in the test specimen at right angles to the surface to receive the plug electrodes.
If it is not ensured that the tapered pins fit tightly in the holes, two holes with a diameter of
5 mm and (25 ii) mm between the centres should be drilled at right angles to the surface to a
depth of about two-thirds of the thickness of the material, but at least to a depth of 10 mm.
These holes should be coated with graphite or conductive silver paint.
The holes can also be processed into moulded specimen. Both holes shall be reamed in the opposite direction with a taper pin reamer according to ISO 3465 with a nominal diameter of 5 mm and the pins inserted with a tight fit.
After conditioning or any other pretreatment the tapered pins shall be inserted with a tight fit in the holes.
5.6.1.2 Sheet materials
The holes shall be drilled on the longitudinal centre line of the specimen area, i.e. symmetrical with the centre of the longitudinal centre line (see Figure 1 and Figure 3).
5.6.1.3 Pipes, bars and rods
The holes shall be drilled on the longitudinal centre line on the sections. i.e. symmetrically with the longitudinal centre line (see Figure 1 and Figure 3, where appropriate).
5.6.1.4 Any other shapes
The holes shall be drilled at a point where the specified distance between the hole centres can be observed on a straight line.
5.6.2 Application of bar electrodes
5.6.2.1 General
The bar electrodes form like two clamps 10 mm x 10 mm x 50 mm, which are fixed by screws and nuts (see Figure 2). They are to be fixed in a distance of 25 mm between their inner edges on the test specimen.
It is recommended to use a guarded metal support for the electrodes. This support shall be connected to the electrodes by means of a insulating material with a volume resistance larger than 1012 flm. The guarding of the metal support shall provide that no current flowing in parallel to the test specimen will influence the measurement (see 5.3).
If no guarded metal support is used, the test specimen shall be placed on an insulating plate
with a volume resistance lager than 1015 1m.
NOTE Insulating materials such as polytetrafluoroethylene can be useful.
5.6.2.2 Tapes, strips and thin rods
A smooth contact shall be provided, comprising the complete surface area in touch with the bar electrodes. In the case of rigid specimen, a tin foil (see 5.2.2) shall be placed between the bar electrodes and the specimen’s surface. The tin foil, however, shall not protrude out of the bar electrodes.
After conditioning or any other pre-treatment of the specimen, it shalt be placed in between the bar electrode arrangement. The screws shall be tightened carefully in a diagonal sequence to avoid damage of the test specimen, but with sufficient torque to provide a proper contact. In case of doubt, comparison tests shall be carried out.BS/EN 62631-3-3-2016 pdf download.
BS/EN 62631-3-3-2016 pdf download
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