Dielectric test according to ASTM D149-09 2014
1. TEST OBJECT
Sample 1: GSL1 10,5 mm Sample 2: GSL 7mm
The sample material was provided by the client.
2. TASK
- Electrical strength (AC) according to ASTM D149-09:2014
Test Parameters
Environmental conditions
Table 1 Environmental conditions
T Min. | T Max. | r.H. Min. | r.H. Max. |
21 °C | 25 °C | 40 % | 60 % |
3. Electrical strength (AC)
The test is carried out in the non-accredited area.
Equipment: Dielectric tester DT 2 -50-20-SR-Pi-C, Sefelec Specimen:
Dimension: approx. 60 mm 60 mm thickness
Number: 3
Test parameters:
Range of measurement: max. 51 kV AC, 50 Hz
Electrodes: spherical Ø 20 mm – spherical Ø 20 mm Voltage slew rate: approx. 2000 V/s
Test medium: Shell Diala S2 ZU-I Dried insulating oil
according to DIN EN 60296:2012
4. Results
The test activities were successfully carried out in accordance with section 2.
Remark:
In case of test specimens no. 1 and 3 the electrical voltage caused a normal breakdown through the thickness. In addition, it flowed sideways through the test specimen until it reached the black string (see Figure 2).
Figure 2: Test specimen 2 of sample 2 after the test;
Left: upper side, blue circle: location of the electrode, blue arrow: burnt region sideways Right: lower side, blue arrow: burnt region in the area of the electrode
