Finned Tubular Heater Hi-Pot Dielectric Withstand Test & Production Batch Screening

Finned tubular heater hi-pot test (dielectric withstand test) applies high AC voltage between live conductor and metal sheath to verify dielectric integrity of MgO insulation. Finned tubular heater standard production hi-pot parameter: 2× rated voltage +1000V AC, 50/60Hz, hold time 60 seconds, no flashover or breakdown. Finned tubular heater hi-pot test detects gross defects: insulation contamination, pinhole in sheath, improper crimping and foreign inclusion inside element. Finned tubular heater caution: repeated hi-pot over-testing will degrade MgO insulation and reduce residual service life. Chuanli Cold Storage Electric Defrosting Tubes uses automated hi-pot tester with current trip alarm for 100% inline factory inspection. Finned tubular heater hi-pot test cannot capture slow micro-leakage; it must be combined with insulation resistance test and helium leak test for critical units. Finned tubular heater safety rule: all test terminals must be fully discharged after hi-pot test to prevent residual electric shock hazard. Finned tubular heater acceptance criteria: no breakdown, no flashover, leakage current below preset trip threshold during holding period. Finned tubular heater field hi-pot test after long service: derate test voltage by 20% compared to factory specification to avoid damaging aged insulation. Finned tubular heater hi-pot dielectric withstand is the primary mass-production screening test for electrical safety of tubular heating elements.

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FAQs Q: What is factory hi-pot test voltage formula? A: 2× rated voltage +1000V AC, hold 60 seconds. Q: What failures can hi-pot detect? A: Insulation contamination, sheath pinholes, bad crimping, internal foreign inclusion. Q: What is the limitation of hi-pot test? A: Cannot identify slow micro-leakage defects. Q: Why repeated hi-pot test is not recommended? A: It degrades MgO insulation and shortens service life. Q: What safety operation requirement after hi-pot? A: Fully discharge all terminals. Q: How to adjust hi-pot voltage for old heaters on site? A: Derate voltage by 20% relative to factory spec. Q: What is the pass condition? A: No breakdown, no flashover, leakage below trip limit.