METHOD FOR DETERMINING CAUSES OF INSTABILITY OF OPERATING THERMAL RELAYS

摘要

FIELD: electrical engineering.;SUBSTANCE: invention relates to electrical engineering and can be used, in particular, to determine the causes of instability of the operation of thermal relays. Method of determining the causes of the instability of the thermal relays includes the selection of five thermal relays of the same type with the same nominal data, the transmission of a certain amount of overload current, the imposition of temperature sensors on each bimetallic plate, which are connected to the temperature recorder, and connected to a personal computer, then connecting the bimetallic plates of the thermal relays in series and connected to the current source, passing a current equal to 1.5 nominal current of the relay, measuring the temperature of each bimetallic plate at the maximum heated point until reaching the response temperature, determining the temperature deviation of the bimetallic plates from its average value.;EFFECT: possibility of increasing the stability of the thermal relay operation during the flow of overload currents.;1 cl, 2 dwg