Measuring device for high-voltage power-frequency electric field
A technology of measuring device and power frequency electric field, which is applied in the field of distribution network, can solve the problems of many interference signals and the influence of measurement accuracy, and achieve the effect of improving measurement accuracy and accurate and reliable measurement results
Pending Publication Date: 2017-09-22
HANGZHOU POWER SUPPLY COMPANY OF STATE GRID ZHENGJIANG ELECTRIC POWER
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Problems solved by technology
[0003] At present, in substations with very strong electromagnetic interference, there are too many interference signals when measuring the electric field, which will have a great impact on the measurement accuracy
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Embodiment 1
[0025] The present invention provides a measuring device for high-voltage power frequency electric field, comprising a microcontroller 1, the output end of the microcontroller 1 is connected with an indicator light module 2, the microcontroller 1 and the indicator light module 2 The input end is also connected to a power supply module 3, and the measuring device also includes at least one sensor signal processing module 4 connected to the input end of the microcontroller 1;
[0026] Wherein, the sensor signal processing module 4 includes a signal differential amplifier circuit 42, and the signal differential amplifier circuit 42 includes an input resistor R7, one end of the input resistor R7 is used as an input terminal, and the other end of the input resistor R7 is connected to an operation The inverting input terminal of the amplifier U1, the op-amp resistor R2 is connected in series between the inverting input terminal and the output terminal of the operational amplifier U1,...
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The invention provides a measuring device for a high-voltage power-frequency electric field, and belongs to the field of power distribution networks. The measuring device comprises a microcontroller, the output end of the microcontroller is connected with an indicating lamp module, the input ends of the microcontroller and the indicating lamp module are connected with a power supply module, and the measuring device further comprises at least one sensor signal processing module connected to the input end of the microcontroller; and the sensor signal processing module comprises a signal difference amplification circuit. In the signal measuring process of the power-frequency electric field, the sensor signal processing module extracts useful signals, amplifies the useful signals and inhibits common-mode interference signals mainly via the signal difference amplification circuit, so that a measuring result is accurate and reliable, and the measuring precision is improved.
Description
technical field [0001] The invention belongs to the field of distribution network, in particular to a measuring device for high-voltage power frequency electric field. Background technique [0002] Electric field measurement is widely used in electric power, aerospace, medical and other industries. In recent years, with the gradual expansion of the coverage of ultra-high voltage power grids across the country, people have paid more and more attention to it. According to the "State Grid Corporation Electric Power Safety Work Regulations", the safety distance of various voltage levels and the corresponding sound and light alarm system are stipulated, and the alarm threshold can be adjusted according to specific requirements. [0003] At present, in substations with very strong electromagnetic interference, there are too many interference signals when measuring the electric field, which will have a great impact on the measurement accuracy. Contents of the invention [0004]...
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Login to View More IPC IPC(8): G01R29/12
CPCG01R29/12
Inventor 沈正阳李旭东陈晨徐建文马涛贾建良王建强杨中彪陈悦胡坚许杰王海荣孙琳陈致远沈萍王开芳宋文泳韩青鲍巧敏陈豪余丰
Owner HANGZHOU POWER SUPPLY COMPANY OF STATE GRID ZHENGJIANG ELECTRIC POWER