High voltage Polymer fuses tests

High voltage Polymer fuses tests can be divided into electrical tests and mechanical tests, such as Low Frequency Flashover Test, mechanical strength test and water penetration and so on.

Low Frequency Flashover Test
• A low-frequency dry flashover test was performed on one new sample and any boiled samples that passed the steep-front test in accordance with Clause of ANSI C29.11.
• The average flashover voltage for each test sample must be at least 90 % of the value of the reference insulator (the new sample) to pass this test.

Low Frequency Withstand Test
• An elevated low-frequency dry withstand test was performed at 80 % of the average flashover value of the reference insulator for 30 minutes on the samples.
• The samples pass this test if no puncture occurs and if the temperature rise of the shank of the insulator is no more than 20 ºC above ambient.

UV Aging
Two samples of each insulator design were placed in an environmental aging chamber and aged for 1,000 hours using UVA-340 bulbs and the following cycle:
• 8 h UV at 60 (± 3) °C Black Panel Temperature;
• 0.25 h water spray (no light), temperature not controlled; and
• 3.75 h condensation at 50 (± 3) °C Black Panel Temperature.
• All samples successfully completed the test with only one manufacturer showing some slight discoloration at the end of the aging period.

Tracking & Erosion
• Each sample must complete 30,000 cycles lasting 200 seconds ± 25 seconds each with the samples stationary no less than 80 % of the cycle time.
• Each cycle consists of the sample going through the four positions with approximately an equal period of time at each position.
• The saline solution in the tank consisted of de-ionized water with 1.40 ± 0.06 g/l of NaCl.
• After every four days of testing, the samples were given a 24 hour recovery period. During this period, the test procedure was the same except the dip tank was empty.

Mechanical / Pre-conditioning
• Cap was engaged in the first thread to simulate a cross threaded condition.
• Distance from the top of the cap to the top of the pivot contact on the lower barrel was measured on all of the units. The distance ranged from 11.930 to 12.002 inches.
• Fuse barrels were then installed in each cutout and the units were placed in an environmental chamber and exposed to the thermal cycle from ANSI C29.13-2000, Figure 4, 96 hours, time at each temperature 8 hours.
• The temperature range was reduced to -30 °C to +40 °C to comply with the service conditions in ANSI/IEEE C37.40 as requested by the manufacturers.

Mechanical / Interruption Tests

High voltage Polymer fuses tests

Recommendations for IEEE C37.41
• Add requirements for Water Penetration Test
• Add requirements for UV Weathering and Tracking and Erosion
• Consider Mechanical Pre-conditioning prior to performance of the Interruption tests.

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