High voltage PCB contamination risks
High-voltage systems are especially sensitive to ionic contamination because electric fields magnify local currents and encourage partial discharge. Lower surface insulation resistance and tracking cause arcing and catastrophic failure at high voltages.
For these applications set conservative cleanliness thresholds and use robust conformal coatings, larger creepage distances, and intensive SIR testing. ZESTRON designs HV-specific cleaning and qualification programs for customers in power distribution, aerospace, and industrial sectors.
Risks associated with high voltage applications
Specific risks:
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surface tracking leading to progressive conductive paths
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partial discharge initiating at microscopic defects
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sudden dielectric breakdown and catastrophic arc damage
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accelerated corrosion of high-voltage terminations
Mitigation requires combination of cleanliness control, design allowances, and environmental protection.
Mitigation strategies for high voltage PCBs
Best practices:
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stricter ROSE and IC thresholds tailored to voltage and environment
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use of hydrophobic, low-ion conformal coatings
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rigorous SIR testing at anticipated operating voltages
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increased creepage, clearance, and guarded design features
ZESTRON’s technical centers assist with voltage-specific test plans and cleaning validation.