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.

Zero-flux current sensor

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.

Community noise control method and device, terminal and computer readable storage medium

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.

Wide-frequency-range transient space electric field measuring system and method

The utility model relates to a multichannel noise remote wireless monitoring device The multichannel noise remote wireless monitoring device comprises a noise acquisition module, a data storage module, a data processing module, an automatic trigger module, a wireless transmitting module, a wired transmission module, a power supply module, a processor, a sensor interface and a shell, the noise acquisition module, the data storage module, the data processing module, the automatic triggering module, the wireless transmitting module and the wired transmission module are connected with the processor Wherein the data storage module is also connected with the data processing module, the power supply module supplies power to the whole monitoring device and is connected with the processor, the shell assembles all the modules inside, and one end of the shell is provided with a multi-channel sensor interface And the noise acquisition module is connected with the sensor interface The device provided by the utility model is simple in structure, reduces the number of equipment, reduces the difficulty of cable arrangement, is small in signal interference, is high in reliability of a measurement result, is small and exquisite in appearance, is convenient to install, and can achieve the synchronous triggering and synchronous measurement of a plurality of devices

Multichannel noise remote wireless monitoring device

The invention provides a low-frequency electric field multi-point synchronous measurement and wireless transmission method. The method comprises a multi-point synchronous measurement stage and an electric field data wireless transmission stage of low-frequency electric field data under a power line, wherein the multi-point synchronous measurement stage of the low-frequency electric field data under the power line is finished by adopting an electric field measurement system; the electric field measurement system consists of a plurality of lower computers and an upper computer; each lower computer is composed of a GPS module, an FPGA, an electric field sensor, a signal processing unit, a first STM32F407ZG microprocessor, a first wireless transmission unit and a first power supply unit; the upper computer is composed of a second wireless transmission unit, a second power supply unit, a second STM32F407ZG microprocessor, a liquid crystal display unit and a storage unit; and the upper computer obtains multi-point synchronous measurement data of the low-frequency electric field, and calculates a voltage of the power line according to a voltage inversion algorithm. According to the method, the non-contact type measurement of the line voltage can be realized, so that the safety and convenience of measurement are greatly improved.

Low-frequency electric field multi-point synchronous measurement and wireless transmission method

The invention relates to a direct-current combined field intensity and ion current density synchronization measurement system based on wireless communication. The system comprises at least 10 direct-current combined field intensity probes, 10 ion current density probes, one upper computer and one PC terminal. A built-in lithium battery is used to provide power for the direct-current combined field intensity probes, the ion current density probes and the upper computer so that long-time field measurement can be achieved. Each direct-current combined field intensity probe and each ion current density probe are communicated with the upper computer through using a wireless communication module. The upper computer and the PC terminal are connected through a USB connecting line. Measurement arrangement and a measuring point position can be conveniently adjusted so that operating efficiency is greatly increased and labor intensity is reduced. The system supports multiple devices, synchronously measures direct-current combined field intensity and ion current density in a high precision mode and really reflects a level and distribution of the direct-current combined field intensity and the ion current density so that an important basis is provided for extra/ultra-high-voltage direct current transmission project electromagnetic environment monitoring, evaluation and influence research.

Direct-current combined field intensity and ion current density synchronization measurement system based on wireless communication

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.

Radio interference computing method and radio interference computing system for alternating-current high-voltage multi-loop electric transmission line

The invention relates to a method for getting rid of radio jamming field measurement abnormal values. The method comprises a step (1) of obtaining a histogram of radio data and a distribution pattern of the histogram; a step (2) of preliminarily determining whether the radio data belongs to normal distribution according to the distribution pattern of the histogram; if the radio data belongs to normal distribution, executing a step (3), or else executing a step (5); the step (3) of adopting a single sample K-S inspection method to determine whether the radio data belongs to normal distribution; if the radio data belongs to normal distribution, executing a step (4), or else executing the step (5); the step (4) of adopting a Robust-Z inspection method to get rid of abnormal data of the radio data; and a step (5) of getting rid of the abnormal data of the radio data based on a normalization processing bounded beta(g,h) distribution function method. The pure statistical method is utilized to get rid of abnormal data values, and a more accurate radio jamming value generated by an electric transmission line can be obtained.

Method for getting rid of radio jamming field measurement abnormal values

The invention provides a paralleling-reactor sound-shield sound reduction measuring method and device. The method includes: measuring first sound intensity level located at the first default distance of a paralleling reactor and calculating sound power level of the paralleling reactor according to the measured first sound intensity level; mounting a sound shield on the paralleling reactor, measuring second sound intensity level at the first default distance of the sound shield and calculating sound power level according to the measured second sound intensity level; determining difference value of the calculated sound power level of the paralleling reactor and the sound power level of the sound shield to be sound reduction of the paralleling-reactor sound shield. The sound reduction is calculated through measurement of the sound intensity levels, sound intensity which is a vector and has directionality is less prone to interference of outer environment, the measured sound intensity is more accurate and reliable, and accuracy in calculation of the sound reduction is improved.

Paralleling-reactor sound-shield sound reduction measuring method and device

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.

Li Ni

Papers

Direct-current combined field intensity and ion current density synchronization measurement system based on wireless communication

Radio interference computing method and radio interference computing system for alternating-current high-voltage multi-loop electric transmission line

Method for getting rid of radio jamming field measurement abnormal values

Paralleling-reactor sound-shield sound reduction measuring method and device

Multi-channel audible noise synchronous measurement system and method