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Author

Zhao Jun

Bio: Zhao Jun is an academic researcher. The author has contributed to research in topics: Voltage & Electric field. The author has an hindex of 2, co-authored 35 publications receiving 30 citations.
Topics: Voltage, Electric field, Oscilloscope, Signal, Noise

Papers
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Patent
22 Feb 2017
TL;DR: In this paper, a radio interference computing method for computing radio interference to an alternating-current high-voltage multi-loop electric transmission line was proposed, which includes dividing a super-highvoltage and an extra-high-volatile multilayer EHV line into a first line group and a second line group.
Abstract: The invention discloses a radio interference computing method for computing radio interference to an alternating-current high-voltage multi-loop electric transmission line. The radio interference computing method includes: dividing a super-high-voltage and an extra-high-voltage multi-loop electric transmission line into a first line group and a second line group; computing radio interference values of the first line group by a CISPR (International Special Committee on Radio Interference) empirical equation method and a CISPR excitation function method; converting the radio interference value computed by the CISPR excitation function method into a value in good weather by the aid of a meteorological correction factor, and comparing the converted value with the result computed by the CISPR empirical equation method to obtain an excitation function correction factor; using CISPR excitation functions to establish a radio interference computation model, computing excitation functions of the first line group and the second line group under the condition of heavy rain respectively, and correcting the excitation function of the first line group under the condition of heavy rain according to the excitation function correction factor; computing the total radio interference value of the alternating-current high-voltage multi-loop electric transmission line under the condition of heavy rain according to the above data, and correcting the total radio inference value through the meteorological correction factor to obtain the total radio interference value of the alternating-current high-voltage multi-loop electric transmission line in good weather.

3 citations

Patent
18 May 2018
TL;DR: In this article, the utility model relates to a multichannel power frequency magnetic field intensity synchronous measurement system, the system includes: the next machine, its and upper computer connection for carryout communication and data transmission with the host computer, the host computers, it links to each other with the next machines for send to the next Machine according to sampling interval and read data command, and the measured data who sends the nextmachine gathers, demonstration, storage, assay and warning, a plurality of power frequency magnetometer measuring unit, it is used for measuring the powerfrequency magnetic field
Abstract: The utility model relates to a multichannel power frequency magnetic field intensity synchronous measurement system, the system includes: the next machine, its and upper computer connection for carryout communication and data transmission with the host computer, the host computer, it links to each other with the next machine for send to the next machine according to sampling interval and read data command, and the measured data who sends the next machine gathers, demonstration, storage, assay and warning, a plurality of power frequency magnetic field intensity measuring unit, it is used for measuring the power frequency magnetic field intensity of power frequency magnetic field intensity measuring unit present position to, power frequency magnetic field intensity value sends alarm signalwhen exceeding the value of setting. The system adopt wireless communication technique and multichannel measuring technique, but measurement power frequency magnetic field intensity's needs are arranged to the multiple spot fully provided transformer substation in, have practiced thrift the communication cost that lays wire, have improved work efficiency and security, have reduced intensity of labour.

2 citations

Patent
15 Dec 2017
TL;DR: In this paper, a multi-channel audible noise synchronous measurement system consisting of an audible noise measurement module, a host computer, a calculation module and an environment monitoring module is described.
Abstract: The invention discloses a multi-channel audible noise synchronous measurement system. The system comprises an audible noise measurement module, a host computer, a calculation module and an environment monitoring module, and is characterized in that the audible noise measurement module is used for measuring noise value data of an A-weighted sound level and different components, receiving a data uploading instruction of the host computer through a wireless communication module and transmitting the measured noise value data of the A-weighted sound level and the different components to the host computer; the host computer is used for receiving a data reading instruction, transmitting a data uploading instruction to the audible noise measurement module and transmitting the measured noise value data of the A-weighted sound level and the different components to the calculation module; the calculation module is used for transmitting a data reading instruction to the host computer according to a preset time interval threshold and receiving and displaying the measured noise value data of the A-weighted sound level and the different components and environment monitoring data; and the environment monitoring module is used for monitoring the environment of a substation to acquire environment monitoring data and transmitting the environment monitoring data to the calculation module.

2 citations

Patent
17 Apr 2018
TL;DR: In this paper, a wide-frequency-range transient space electric field measuring system and method is described, which consists of a dual-plate electrode sensor, a front-end signal processing unit, a signal collecting recording unit and a transmission unit.
Abstract: The invention discloses a wide-frequency-range transient space electric field measuring system and method. The system comprises a dual-plate electrode sensor, a front-end signal processing unit, a signal collecting recording unit and a transmission unit; the dual-plate electrode sensor is arranged in a transient space electric field for sensing, transient space electric field signals are convertedinto measurable voltage signals; the front-end signal processing unit is used for processing and controlling the measurable voltage signals input by the sensor and optimizing waveforms of the outputvoltage signals; the signal collecting recording unit is used for collecting and recording voltage signals output by the front-end signal processing unit, and obtaining transient electric field signals through calculation of the collected voltage signals; the transmission unit is used for transmitting the voltage signals converted by the front-end signal processing unit to the signal collecting recording unit to achieve remote measurement; according to the system and method, the differential operation function does not need to be enabled, and therefore the lower limit of the measurable electric field frequency is widened.

2 citations

Patent
06 Apr 2018
TL;DR: In this article, the authors proposed a method and system for measuring the intensity of a power frequency electric field, and the method comprises the steps: solving an electromagnetic equation of a quasi-static field through a finite element numerical method, and carrying out the simulation calculation of the dimension of uniform electric field regions of metal circular pole plates, which have different radiuses and are arranged horizontally in an up/down manner, at different intervals between the pole plates.
Abstract: The invention provides a method and system for measuring the intensity of a power frequency electric field, and the method comprises the steps: solving an electromagnetic equation of a quasi-static field through a finite element numerical method, and carrying out the simulation calculation of the dimension of uniform electric field regions of metal circular pole plates, which have different radiuses and are arranged horizontally in an up/down manner, at different intervals between the pole plates; manufacturing metal circular pole plates which completely meet the above simulation conditions, and carrying out the calibration test of an electric field probe; making a calibration curve between the proportion of the theoretical field intensity to the reading of the probe and the interval between the metal pole plates according to the combination of the test result and the simulation result; carrying out the simulation estimation of a detected electric field during actual measurement, and then obtaining the real electric field level according to the above calibration curve. The method can determine the size of the electric fields which are suitable for power frequency electric field probes in different sizes. The method can eliminate the distortion impact on the detected electric field from the introduction of the probe through the calibration, and the accurate intensity of the electric field in a region measured by the electric field probe is solved.

2 citations


Cited by
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Patent
17 Jul 2018
TL;DR: In this paper, a distributed transmission network power-frequency electromagnetic field analysis method is presented, which is applicable to the power frequency electromagnetic field simulation of complex distributed transmission networks, and fills the blank in relevant technology.
Abstract: The invention discloses a distributed transmission network power-frequency electromagnetic field analysis method and belongs to the technical field of electromagnetic fields. The method comprises constructing a distributed transmission network model according to the nodes, loops, and voltage and current on the loops of a real distributed transmission network; then constructing a simulation-domainmodel according to the environment where the real distributed transmission network is located; further simulating and calculating a power-frequency electromagnetic field generated by the distributed transmission network in space, revealing the law of the power-frequency electromagnetic field generated by the distributed power transmission network by the visualization of the power-frequency electromagnetic field simulation data, and further revealing the conduction law of the power-frequency electromagnetic field generated by the distributed power transmission network under different media by calculating the divergence and rotation of the electromagnetic field. The method is applicable to the power-frequency electromagnetic field simulation of a complex distributed transmission network, andfills the blank in relevant technology.

3 citations

Patent
30 Nov 2018
TL;DR: In this paper, the authors proposed a three-axis magnetic field sensor, which consists of an X/Y double-axis sensor and a Z-axis magnetometer, where two groups of Wheatstone bridge structures are formed by the sensors to realize the measurement of the magnetic field.
Abstract: The invention relates to a three-axis magnetic field sensor, which comprise an X/Y double-axis magnetic field sensor and a Z-axis magnetic field sensor, wherein the X/Y double-axis magnetic field sensor and the Z-axis magnetic field sensor are both arranged on a substrate and have adjacent positions; two groups of Wheatstone bridge structures of the X/Y double-axis magnetic field sensor form two outputs to realize X/Y-axis magnetic field measurement; under the function of a Z-axis magnetic field, the Z-axis magnetic field sensor generates two horizontal component leakage flux magnetic fields in different directions; and the horizontal component leakage flux magnetic fields are perceived and output through the bridge to realize Z-axis magnetic field measurement. By use of the three-axis magnetic field sensor, single-core integration can be realized, the three-axis magnetic field sensor can realize the integration of single-core technology levels, i.e., all magnetoresistance units can besimultaneously manufactured in the same technology, and therefore, the three-axis magnetic field sensor has the advantages of high integration degree, good stability and high anti-jamming capability.

2 citations

Patent
28 Sep 2018
TL;DR: In this paper, a zero-flux current sensor, consisting of a magnetic probe winding, a signal processing circuit, compensating current power driving circuit, an abnormity monitoring circuit, a regulating switch, and a negative feedback regulating circuit, is presented.
Abstract: The invention relates to a zero-flux current sensor, which comprises a magnetic probe winding, a signal processing circuit, a compensating current power driving circuit, an abnormity monitoring circuit, a regulating switch and a negative feedback regulating circuit. The signal processing circuit is in electrical connection with the magnetic probe winding; the compensating current power driving circuit is electrically connected with an output end of the signal processing circuit and the magnetic probe winding; the abnormity monitoring circuit is in electrical connection with the magnetic probewinding; the regulating switch is in electrical connection with the signal processing circuit; the negative feedback regulating circuit is electrically connected with an output end of the abnormity monitoring circuit and the regulating switch and is used for controlling on-off states of the regulating switch according to operating states, acquired by abnormity monitoring circuit in detection, of the magnetic probe winding to further control output signal reverse of the signal processing circuit to realize compensating current reverse, a magnetic core of the magnetic probe winding quits a saturated state when tested current recovers to a measuring range, a current measuring function is recovered, and the zero-flux current sensor recovers to a normal operating state.

2 citations

Patent
21 Jun 2019
TL;DR: In this article, a lead potential measurement method is described in which a first three-dimensional electric field sensor and a second 3D sensor are disposed in advance in a preset range around a to-be-tested lead.
Abstract: The invention discloses a lead potential measurement method. The lead potential measurement method is characterized in that a first three-dimensional electric field sensor and a second three-dimensional electric field sensor are disposed in advance in a preset range around a to-be-tested lead, that lines where the two-dimensional electric field sensors are located are not parallel to the to-be-tested lead is guaranteed, and a potential value of the to-be-tested lead is calculated based on the first electric field intensity measured by the first three-dimensional electric field sensor, the position information of the first three-dimensional electric field sensor, the second electric field intensity measured by the second three-dimensional electric field sensor and the position information of the second three-dimensional electric field sensor. The method is advantaged in that the two three-dimensional electric field sensors are utilized, compared with a voltage transformer, a measurementdevice is lighter, access with a tested line is not needed, influence of the tested line is reduced to the maximum degree, compared with one electric field sensor, requirements for the test positionare greatly reduced, measurement difficulty is reduced through utilizing two angles, and measurement accuracy is improved. The invention further provides a lead potential measurement device and system. The advantages are further achieved.

2 citations

Patent
28 Dec 2018
TL;DR: In this article, a community noise control method and device, a terminal and a computer readable storage medium are described, which comprises the steps of acquiring noise-related data of each predetermined area in a community, wherein the noise related data comprises a noise value, noise generation time and a noise generation position; judging whether the noise exceeds the standard or not according to at least one of the noise generating time and the noise generator position.
Abstract: The invention discloses a community noise control method and device, a terminal and a computer readable storage medium. The community noise control method comprises the steps of acquiring noise-related data of each predetermined area in a community, wherein the noise-related data comprises a noise value, noise generation time and a noise generation position; judging whether the noise exceeds the standard or not according to at least one of the noise generating time and the noise generation position, and the noise value; when the noise exceeds the standard, enabling noise reminding equipment tosend out a noise standard-exceeding reminder; and after a first predetermined time, if the noise still exceeds the standard, sending the noise-related data to property management equipment. Accordingto the community noise control method, the noise of each area in the community range can be automatically detected, and the noise generation area can be automatically reminded according to the noiserange. In addition, the noise generation area is subjected to noise control in different time periods.

2 citations