Impatt kontromiżuri ta ' kulur doppju infra-aħmar termometri
Faults in electrical equipment, whether they are caused by current-effect heating faults (conductive circuit faults), the heating power is proportional to the square of the load current value. Voltage effect caused by heating faults (insulation medium failure), the heating power and operating voltage is proportional to the square. Therefore, the size of the operating voltage and load current of the equipment will directly affect the effectiveness of infrared detection and fault diagnosis. The increase in leakage current can cause uneven voltage in some parts of the high-voltage equipment. If there is no loaded operation or the load is very low, it will make the equipment fault heating is not obvious, even if there is a more serious fault, it is unlikely to be exposed by the characteristic thermal anomaly form. Only when the equipment is running at the rated voltage, and the higher the load, the more serious the heating and temperature rise, and the more obvious the characteristic thermal anomalies at the point of failure are exposed. Therefore, in infrared detection, in order to achieve reliable detection results, to try to ensure that the equipment in the rated voltage and full-load operation, even if it can not do continuous full-load operation, but also should be prepared for a running programme, so that in the detection process before and during the test, the equipment can be run at full load for a period of time (eg, 4 ~ 6h), so that the faulty parts of the equipment have enough time to heat up and ensure that the surface of the surface to achieve a stable Temperature rise.
Due to electrical equipment failure infrared diagnosis, fault judgement criteria is often based on the temperature rise of the equipment at rated current, so when the test when the actual operation current is less than rated current, the rated current, should be the site of the site of the actual measurement of the equipment failure point temperature rise converted the temperature rise of the temperature rise of the rated current.
