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High voltage Polymer fuses Cutout should be tested before shipping, the insulator test includes water penetration and low frequency flashover voltage in accordance with ANSI C29.13-2000, “American National Standard for Insulators – Composite Distribution Deadend Type”.
Water penetration for High voltage Polymer fuses Cutouts – ANSI C29.13, Clause 7.1
Test Description | Pass/Fail Criteria |
Hardness test – ASTM D2240 | N/A |
100 hour boiling water test - in water having 0.1% by weight of NaCl | N/A |
Hardness test – ASTM D2240 | Hardness must not change from the pre-boiled specimen by more than 20% |
Steep-front impulse voltage test (10 positive & 10 negative) | All impulses must cause external flashover. Punctures must not occur. |
Low-frequency flashover test | Shall equal or exceed 90% of baseline flashover value |
Elevated AC withstand test | No puncture shall occur. The temperature rise of the shank of each sample insulator shall be no more than 20 °C above ambient. |
Once the samples are removed from the boiling water, all remaining tests on each sample must be performed in a forty-eight hour period.
Hardness test – ASTM D2240 after 100 hour boiling
• Requirement – hardness must not change from the preboil specimen by more than 20%
• Maximum % change observed was +10.1% and -9.4%
• No visible signs of cracks, dissolving or crumbling were found upon visible inspection after the boil period.
• All units passed.
Steep-front Impulse Voltage Test after 100 hour boiling
• 10 positive and 10 negative impulse waves with a voltage steepness of at least 1000 kV/μs per IEEE Std 4-1995, Section 7.2.7.
• The test is considered successful if all impulse applications result in an external flashover of the insulator samples and NO PUNCTURES are observed.
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- E-mail: sales@orientinsulators.com
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