Temperature measuring device for high-voltage electrical equipment
A technology of high-voltage electrical appliances and temperature measuring devices, which is applied in the field of electric power and high-voltage electrical equipment, can solve problems such as interference and inaccurate sensor temperature signals, and achieve the effect of improving accuracy
Inactive Publication Date: 2022-01-21
河南亚诺电气设备有限公司
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[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a temperature measuring device for high-voltage electrical equipment, which effectively solves the problem of inaccurate temperature signals detected by sensors in strong electromagnetic interference environments
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[0009] The technical solutions of the various embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.
[0010] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0011] A temperature measuring device for high-voltage electrical equipment, including a temperature detection circuit, an interference filtering device, and a push-pull output circuit. The temperature detection circuit uses a positive temperature coefficient thermistor RT1 and a negative temperature coefficient thermistor RT2 to detect the temperature of the high-voltage electrical equipment , output after mean value calculation by the mean value circuit, two methods of detection and then mean value processing are used to reduce the ...
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The invention provides a temperature measuring device for high-voltage electrical equipment. The temperature detection circuit adopts positive and negative temperature coefficient thermistors to detect the temperature of the high-voltage electrical equipment, and outputs the temperature after mean value calculation, peak suppression and abnormal value processing; the interference filtering device adopts a subtractor to calculate a positive temperature coefficient thermistor and process a signal after an abnormal value; when the difference value is small, the signal and the temperature threshold value of the high-voltage electrical equipment enter a first comparator to calculate the difference value voltage after the abnormal value is processed through change rate coupling; when the difference value is large, the second comparator calculates the difference value; when the output voltages of the first comparator and the second comparator are both small, the conduction time of the thyristor VT1 is changed; when the output voltage of the second comparator is smaller than the output voltage of the subtracter, an abnormal value is processed and discharged to the ground, a push-pull output circuit amplifies a temperature signal through a push-pull circuit and then outputs the temperature signal, a triode Q5 is arranged for pre-amplification and is fed back to a mean value circuit through a resistor R28 to adjust the amplitude of the signal, and a temperature compensation circuit compensates the output signal of the mean value circuit.
Description
technical field [0001] The invention belongs to the technical field of electric power and high-voltage electrical equipment, and in particular relates to a temperature measuring device for high-voltage electrical equipment. Background technique [0002] For high-voltage electrical equipment in power plants, substations and other high-voltage distribution rooms, heating or discharge flashover occurs due to poor contact, overload, short circuit, etc., and serious heating will affect the normal operation of the equipment. Accurate monitoring of the temperature of high-voltage electrical equipment appears to be particularly important. [0003] In order to reduce the interference of high-voltage electromagnetic and ambient temperature, contact sensors are commonly used in high-voltage electrical equipment to detect temperature. However, in the environment of strong electromagnetic interference, the sensor has serious interference and self-heating phenomenon, resulting in inaccura...
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IPC IPC(8): G01K7/24
CPCG01K7/24
Inventor 赵斌杨运平罗强
Owner 河南亚诺电气设备有限公司