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Automatic electrical controls for heating test analysis of test methods


Connected to the electrical requirements of the electrical load to the specimen; ⑤ above, this is no longer described. Based on the above two methods, the ambient temperature in the constant adjustment determined, then the data results fever saved. The controller circuit heating test contacts, usually only with the current heat on, just to ensure that the circuit current is 1.06 times the rated current can be, this time the most severe electrical conditions, heat is the highest. Contact closed very small contact resistance is negligible, according to the heat equation Q =, 2Rt we can see that the process of continuous power to generate heat,[link widoczny dla zalogowanych], electricity and heat production-related parameters only current. Although the heat continue to produce, but to persist for some time, the heat will tend to reach a constant temperature, and then remain unchanged. Standard heating test requires stable power after 4 hours,[link widoczny dla zalogowanych], or temperature for 1 hour, followed by heating to obtain temperature data, print, read the temperature of the temperature curve, or directly, pursuant to Table 14.1 in the standard maximum limit temperature of the specific parts of the comparison, the eligibility determination, the actual measured temperature does not exceed the limit value table 14.1 to determine compliance. Such as hand-wound timer, electric fans or washing machines used in the timing system, by clockwork and gear drive to achieve the time delay, the cam and the combination of components to achieve reed making and breaking the circuit. Such control is only breaking the mechanical contact device is a heat source, the test only needs to adjust the temperature stable environment,[link widoczny dla zalogowanych], in carrying parts, terminals and operating axis Gabriel measurement points. Tests need to maintain contact without winding control, always-on. For measuring devices such as programmable as the course in a time cut off contacts will often also need to contact stays on. 3 heating power controller test winding are many ways to exist in household electric automatic control winding, such as solenoids, washing machine inlet valve, microwave oven timer micro motor and so on. Winding skeleton structure that is wound on the insulation and insulated copper wire impregnated, is characterized by high electrical resistance, the working current, the work is voltage sensitive circuit. For such structures need to consider only the heating test test voltage, typically 1.06 times rated voltage. Test methods for the winding method or direct thermocouple measurement. Winding method, that is, before and after winding through the measurement of heat resistance and record the ambient temperature before and after heating, temperature rise calculated using the formula method. △ t = (R2-R1) (234.5 + t1) / R1-(t2 a t1) ・ where: △ t for a temperature rise; scale resistance at the beginning of a trial;, one end of the trial resistance; t the beginning of a test ambient temperature (maximum temperature); t, one end of the experiment the ambient temperature. Then △ t with the initial ambient temperature to obtain the maximum temperature heating test. Fever during the test usually has little effect on the ambient temperature, that is the beginning and the end of the test ambient temperature is very small, in fact, there may still be changed. Maximum temperature obtained by the following formula: T = I + △ t = T + △ tR power is usually not the case in the ohmic range measuring multimeter, reading scale, the time for the same equipment is also used to maintain the same multimeter. R,[link widoczny dla zalogowanych], measured when the need for power, cut off the power after the fall of temperature causes the sample resistance is also declining, at this time should be recorded quickly over the same frequency resistance values, such as a second record, but also need to record the open circuit to record the first value of the time. The process can be completed with other people with. Although it is not recorded in the value of the highest temperature of the resistance, but can be described to establish plot points, the interval between each recorded value is the same, and there the first time a data record, you can get the process temperature decreases, the resistance The linear relationship between time and then create a formula by computer-aided software to get the corresponding zero resistance timeline ruler. . Winding heating test and then calculated the maximum temperature. Of course, if you can live with the equipment measurement of winding resistance, no need to use the above process was. Method of direct measurement of the thermocouple is arranged in the winding thermocouple directly measured the surface. The measured winding temperature than the maximum temperature is small, so the standards required to use direct measurement of winding temperature limit of measurement than the use of a small winding temperature limits law. Winding is usually closed in the enclosure,[link widoczny dla zalogowanych], the use of this method is simple measurements, but will destroy the sample structure, may affect the standard of other sections of the test, it is usually chosen winding method. 4 Conclusion The above is my heating test is a detailed description of testing methods and lessons learned to prepare and test or production industry colleagues to exchange. References GB14536. 1.2008 {for household and similar use automatic controller Part I: General requirements \ More articles related to topics：


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