Ring main unit insulation tube

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1. The outer surface is smooth, free of bubbles and cracks； 2. Pdwer frequency withstand voltage≥45kv/1min; 3. Lightning shock≥110kv/1min; 4. Appartial discharge14.4kV≤5pC; 5. Capacitance value25±5pF； 6. Gas tightness test using nitrogen mass spectrometer leak detector, leak rate＜5*10-8 Pa.m2/S；

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Ring main unit insulation tube

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