Voltage transformer calibration instrument with temperature measurement function
A voltage transformer and temperature measurement technology, applied in the measurement of electrical variables, measuring devices, instruments, etc., can solve the problems of inability to directly provide 5V power supply, instant temperature measurement without testing, etc., and achieve on-site test data science and accuracy and simple structure. , cost-saving effect
Active Publication Date: 2015-12-23
STATE GRID CORP OF CHINA +1
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Problems solved by technology
However, due to the limitations of the test conditions on site and the negligence of the staff, the instant temperature of the test is often not measured
[0003] The input voltage of an electronic thermometer is usually 5V, and it is usually impossible to directly provide a 5V power supply in field tests
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[0019] The invention is a voltage transformer calibrator with temperature measurement function, specifically a temperature measurement device connected in parallel in the secondary circuit of a standard voltage transformer, which can realize the real-time temperature reading on the spot while performing the on-site error inspection .
[0020] The calibrator of the present invention is mainly composed of a resistance-capacitance voltage divider circuit, a rectification filter circuit, a 7805 voltage stabilizing circuit and an electronic thermometer, and its simplified structure diagram is as follows figure 2 shown. The resistance-capacity voltage divider circuit, the rectification filter circuit and the electronic thermometer are connected in parallel, the connection line between the rectification filter circuit and the electronic thermometer is connected to a 7805 voltage stabilizing circuit, and the other end of the 7805 voltage stabilizing circuit is connected to a power su...
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The invention relates to the technical field of field measurement of the power voltage transformer, especially to a voltage transformer calibration instrument with a temperature measurement function. The voltage transformer calibration instrument comprises a resistance-capacitance voltage-dividing circuit, a rectifier filter circuit, a 7805 voltage-stabilizing circuit and an electronic thermometer. The resistance-capacitance voltage-dividing circuit, the rectifier filter circuit, and the electronic thermometer are connected in parallel; the 7805 voltage-stabilizing circuit is connected to the connecting wire between the rectifier filter circuit and the electronic thermometer; and the other end of the 7805 voltage-stabilizing circuit is connected with a power supply. According to the invention, when a tester carries out comparison value error and phase error testing of the transformer, a real-time temperature at field can be read, so that the field testing data of the voltage transformer becomes scientific and accurate. Meanwhile, the power of the temperature module is from the voltage transformer calibration instrument. The structure is simple and the costs are saved. The voltage transformer calibration instrument can be widely applied to the power system.
Description
technical field [0001] The invention relates to the technical field of on-site measurement of power voltage transformers, in particular to a voltage transformer calibrator with a temperature measurement function. Background technique [0002] According to the requirements of JJG314-2010 "Verification Regulations for Measuring Voltage Transformers", when conducting field tests on voltage transformers, it is necessary to measure the temperature conditions on site. However, due to the limitations of the test conditions on site and the negligence of the staff, the instant temperature of the test is often not measured. [0003] The input voltage of an electronic thermometer is usually 5V, and it is usually impossible to directly provide a 5V power supply in field tests. The secondary voltage of the three-phase four-wire voltage transformer is usually When conducting a field test on a voltage transformer, it is necessary to connect the secondary voltage of the voltage transform...
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IPC IPC(8): G01R35/02
Inventor 刘罡常源曾辉李永臣孙长河郝新
Owner STATE GRID CORP OF CHINA