METHOD FOR NONCONTACT REMOTE DIAGNOSTICS OF HIGH-VOLTAGE POLYMER INSULATORS Russian patent published in 2015 - IPC G01R31/12 

FIELD: electricity.

SUBSTANCE: simultaneously with passive receipt by electromagnet receiver of electromagnetic emission from partial discharges passive receipt by infrared receiver of infrared radiation from partial discharges, indication and joint computer processing of electromagnetic and infrared signals with high-voltage phase, their accumulation through narrow phase ranges is carried out. Calculation of actual charge is made and average number of pulses in partial discharges is defined for each discrete range of phase voltage. Electromagnetic and infrared signals with high-voltage phase are registered by two sources reference source of internal and surface partial discharges and polymer insulator with internal and surface defects. Signals from internal partial discharges are registered by the electromagnetic receiver, while signals from surface partial discharges are registered by the infrared receiver. Status of high-voltage polymer insulator is assessed against three diagnostic properties differentiating operational polymer insulators from defective ones: occurrence of single partial discharges and step-by-step increase in quantity of pulses in partial discharges for discrete phase voltage range with average value of actual charge of 100 pCb is specific for internal defects and commencement of internal damage of a polymer insulator; occurrence of one-by-one series partial discharges with average value of actual charge of 100 pCb is specific for pre-breakdown condition stipulated by internal defects of a polymer insulator; increase in quantity of pluses of high-power surface partial discharges for discrete phase voltage range with average value of actual charge of 2000 pCb is specific for pre-breakdown condition stipulated by surface destruction of a polymer insulator.

EFFECT: simultaneous measurement of internal and surface partial discharges for certain discrete phase voltage ranges.

2 cl, 1 dwg