Test method for insulation heat shrinkable tube of parent row

Purpose of the experiment:

The mechanical and electrical properties of the parent-row insulated casing are tested and confirmed to meet the UVR-8019 test requirements.

The successful mechanical and electrical performance test of the parent row insulating casing can be applied to the application requirements of the mother row insulation, and the test includes AC, DC insulation crash test, impact voltage tolerance test, flammability test and Alenius aging test.

Material & amp; Sample preparation:

All test samples are parent-row insulated heat shrinkable casing 100/40, for mechanical testing, tert and insulating test samples are placed in the oven by the casing in a C, 15 minutes. For flammability tests, the insulating casing shall be thermally shrunk on the test shaft. The insulated heat shrinkable casing is installed on the mother row by heating the torch on the parent row of the electrical characteristic test product from the PII-51076 of the discharge inhibitor.

Test procedure:

Tensile force and ductility test:

5 ASTM-D412-compliant specimens were machined by the completed shrinkage casing material and carried out tensile force and ductility tests, carried out by INSTRON 5000R equipment, and the equipment used BlueHill software. The test was carried out at room temperature according to astm-d638, and the fixture began at a distance of 2 inches at a rate of 2 inches per minute.

AC Insulation Strength Test:

Three 0.11 "thick, 3" X 3 "test products, the Exchange crash test, the test product from contact electrode contact after immersion into the insulating oil, by the haefely AC insulation strength test equipment 750-10 at a rate of 750 volts per second for automatic boost, according to astm-d149 for aging and layer aging casing To carry out the test.

DC Insulation Strength Test:

Three 0.11 "thick, 3" X 3 "test products, through the impact of self-flow crash test, the test product from the impact contact electrode contact after immersion into the insulating oil, 1.2x50us impact test, impact voltage from 70KV, the increase rate of 5KV until the flashover. The average breakdown voltage is used for the calculation of insulation strength.

Electrical marks and electrical etching tests:

Electrical marks and electrical erosion test according to the ASTM-D2303 specification, three 2 "x 5" of the test products by isopropyl alcohol cleaning, and then clean by distilled water, with No. 400 silicon carbide sandpaper gently polished, and then clean with distilled water, the following contact electrode with silver conductive paint coating.

astm-d2303 requires a test thickness of 0.250 ", bptm-100/40 measured a shrinkage thickness of 0.11", so the actual thickness of the tert test is 0.11 "(tested with a thinner test).

The electrical marks and cavitation tests obtained different data from different voltage levels, and the flow rate of voltage and conductive solution in this experiment is a gradual super time test.