IEC 60851-5:1998 pdf download – Winding wires -Test methods -Part 5: Electrical properties

IEC 60851-5:1998 pdf download – Winding wires -Test methods -Part 5: Electrical properties.
This part of IEC 60851 specifies the following tests:
— Test 5: Electrical resistance;
— Test 13: Breakdown voltage;
— Test 14: ContinuIty of insulation;
— Test 19: DielectrIc dissipation factor;
— Test 23: Pin hole.
For definitions, general notes on methods of test and the complete series of methods of test for winding wires, see IEC 60851-1.
2 Normative 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 edition of the referenced document (including any amendments) applies.
IEC 60851-1. Winding wires — Test methods — Part 1: General
3 Test 5: ElectrIcal resistance
Electrical resistance is the d.c. resistance at 20 C of 1 m of wire.
The method used shall provide a precision of 0,5 %
For bunched wires a length of up to 10 m shall be used and the ends shall be soldered before the measurement. When measuring the resistance to check for an excessive number of broken wires, a length of 10 m of bunched wire shall be used.
If the resistance R1 is measured at a temperature I other than 20 C, the resistance R20 at 20 C shall be calculated by means of the following formula:
4.5.2 Test at elevated temperature
A specimen prepared according to 4.5.1 shall be placed in the oven preheated to the specified test temperature ±3 °C. The shot and container shall be preheated within the oven at the test temperature and kept there during the loading of the test specimen The loading operation of the test specimen shall be performed very gently In order to avoid damage to the specimen.
The test voltage shall be applied according to 4.1 between the conductor and the shot in not less than 15 mAn after placing the specimen in the oven. The test shall be completed within 30 mm.
The temperature shall be kept within ±3 °C.
Five specimens shall be tested. The five single values shall be reported.
4.6 Fibre wound round wire
4.6.1 Test at room temperature
A straight piece of wire of sufficient length with the insulation removed at one end shall be bent 10 turns around a mandrel as shown in Figure 4. The diameter of the mandrel shall be
— 25 mm ± 1 mm for nominal diameter up to and Including 2,500 mm;
— 50 mm ± 2 mm for nominal diameter over 2500 mm.
The specimen shall be placed in the container as shown in Figure 4 and shall be surrounded by shot at least 5 mm between the specimen and the inner walls of the container. There shall be a minimum distance of 2,5 mm between adjacent turns. The ends of the specimen shall be sufficiently long to avoid flashover.
The shot shall be poured gently into the container until the specimen is covered by shot at a depth of 90 mm. The metal shot shall not be more than 2 mm in diameter; balls of stainless steel, nickel or nickel-plated iron have been found suitable. The shot shall be cleaned once per year.
The test voltage shall be applied according to 4.1 between the conductor of the wire and the shot.
NOTE By agreement between the purchaser and the supplier, the test may be carried out with the specimen
under oil. Oil should be in accordance with IEC 60296 or as agreed upon between customer and supplier.
Five specimens shall be tested. The five single values shall be reported.