Study on the Influence of Internal Heat Dissipation on External Insulation Flashover Characteristics for DCVT

Le résumé fourni par la source

To enhance the measurement reliability of resistive-capacitive DC voltage transformers (DCVTs), this study investigates how the thermal performance of internal resistive-capacitive components impacts external insulation flashover. Temperature field simulation models were built for two DCVTs with distinct heat dissipation structures; additionally, dry-wet zoning temperature criteria were proposed, and the formation mechanism of dry bands in external insulation flashover was analyzed. The key innovation and finding is that internal heat dissipation in resistive-capacitive DCVTs significantly reduces the axial temperature difference on the external surface, cutting the area of dry bands caused by external contamination by 40%—this substantially improves DCVT operational reliability and ensures accurate measurement performance.

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