The invention belongs to the field of direct current detecting instruments, and particularly relates to a range-adjustable digital galvanometer capable of measuring a weak current signal based on STM32. The range-adjustable digital galvanometer comprises a range switching and input protection circuit, a signal conditioning circuit, an A/D conversion circuit, an STM32 control circuit, a TFT screendriving circuit and a power supply circuit. According to the digital galvanometer, by using a designed IIR low-pass filter, an output signal obtained through high-resolution bipolar analog-digital conversion is filtered, an analog-digital converter cooperates with the STM32 to complete digital acquisition, TFT screen pointer display and digital display are completed through the driving circuit, the weak current signal detection precision is improved, and it is convenient for a user to read data. Because of the switchable range and the digital pointer display, the risk that the galvanometer isdamaged due to over-high detected current is reduced, the capacity of resisting disturbance is high, the operation is simple, the cost is low, and the range-adjustable digital galvanometer is easy topopularize.

Range-adjustable digital galvanometer based on STM32

The invention discloses a strong-magnetism electricity stealing prevention method. The method comprises the following steps of: firstly, connecting a Rogowski coil in parallel to an electromagnetic current transformer in an electric energy metering device, and acquiring signals IkA of the Rogowski coil and signals IkB of the electromagnetic current transformer in real time; secondly, performing analog-digital conversion on the IkA signals and the IkB signals at the same time; thirdly finding a waveform phase zero point to adjust a waveform of the Rogowski coil and a waveform of the electromagnetic current transformer so as to compare data of the two waveforms at the same time, thereby determining whether strong-magnetism electricity stealing exists; and alarming when the strong-magnetism electricity stealing is detected. The strong-magnetism electricity stealing prevention method accurately determines behavior of the strong-magnetism electricity stealing by using the Rogowski coil withlow detection precision, and has the advantages of simple operation, low cost and high efficiency or the like.

Strong-magnetism electricity stealing prevention method

The invention relates to the technical field of electric energy meters, in particular to an automatic compensation method for an electric energy meter. The automatic compensation method comprises thefollowing steps that 1, a sensor detects a magnetic field signal, and a metering chip calculates a power value; 2, a processor acquires the magnetic field signal and the power value which are obtainedin the step 1 simultaneously every once in a while and judges whether or not the magnetic field signal exceeds a set first threshold, if the magnetic field signal does not exceed the set first threshold, the processor continues to conduct acquisition, and if the magnetic field signal exceeds the set first threshold, the magnetic field signal is set as a threshold exceeding magnetic field signal,the total acquired power value is set as threshold exceeding power, and then operation skips to the next step; and 3, the processor judges whether or not the change rate between the threshold exceeding power and a previous acquired power value exceeds a set second threshold, if the change rate does not exceed the second threshold, operation returns to the step 2 to continue to conduct acquisition,and if the change rate exceeds the second threshold, the threshold exceeding power is calibrated. According to the method, a deviation generated by a power frequency magnetic field can be compensated.

Automatic compensation method for electric energy meter

Embodiments of the invention disclose a strong magnetic electricity stealing monitor method and device and related equipment. The method comprises the steps of acquiring a sampling signal at the secondary side of a current transformer to carry out low-pass filtration; extracting a period midpoint of output waveforms of the current transformer; acquiring a first waveform data set of the first halfperiod and a second waveform data set of the second half period; comparing the data in the first waveform data set and the second waveform data set one by one, when the difference between the data isgreater than a preset value, considering that a strong magnetic electricity stealing condition exists, and calculating the stolen electricity through detecting the output current of the current transformer. According to the method, the waveforms of the first half period and the second half period are compared, judgement is carried out to determine whether the waveforms distort or not so as to judge whether strong magnetic electricity stealing behaviors exist or not, and when the electricity stealing behaviors exist, the stolen electricity is calculated, so that the problems that the strong magnetic electricity stealing cannot be efficiently judged and the stolen electricity cannot be calculated in the prior art are solved.

Strong magnetic electricity stealing monitor method and device and related equipment

The invention discloses a circuit design method for constant magnetic field detection of a transformer. The method S1, a magnetic detection circuit is utilized to detect whether a constant magnetic field outside the transformer exceeds a standard value, if yes, a detected event is recorded and uploaded to a single-chip microcomputer control system; and S2, the event uploaded by the magnetic detection circuit is stored by the single-chip microcomputer control system and reported to background control software through an RS485 communication circuit. The method is advantaged in that based on a low-voltage through-core current transformer, change of the constant magnetic field outside the low-voltage through-current current transformer is detected based on the electromagnetic induction principle, and active reporting and real-time communication functions are realized.

Circuit design method for constant magnetic field detection of transformer

The invention discloses a method for preventing external constant magnetic field interference to an intelligent electric meter. The method is used for compensating electricity in case that the external constant magnetic field interference causes inaccurate measurement of the electric energy meter. The method, when the electric energy meter is subjected to external constant magnetic field interference, detects the magnetic flux density of the external constant magnetic field by virtue of a constant magnetic field detection unit installed adjacent to a current transformer in the electric energy meter, and calculates, by a DSP, electricity loss due to external constant magnetic field according to a load current effective value detected by the current transformer in the electric energy meter and according to a relationship table stored in the storage unit in the electric energy meter, so as to compensate electricity. The method overcomes a problem that a traditional method leads to an increase in the production cost of the electric energy meter and difficulty in electricity compensation caused by magnetic field interference.

Method for preventing external constant magnetic field interference to intelligent electric meter

The invention provides an automatic load matching device used for the electric energy meter direct current and even-order harmonic influence test. The automatic load matching device comprises an electronic load cell, a driving circuit, a phase inverter, a feedback circuit, a resistance (R11), a resistance (R12) and a resistance (R13). The automatic load matching device through the adoption of the feedback method regulates the guide pass resistance of the field effect tube to achieve the match of the voltage of the support road end II and the automatic match of the checked meter resistance, and the matched information is converted into feedback signals and outputted to the drive circuit; the drive circuit regulates the outputted voltage value according to the output signal size of the anti-phase device and the feedback circuit unit; the electronic load unit regulates the guide pass impedance of the internal MOSFET tube according to the output voltage value of the drive circuit to change its own impedance, so as to achieve the automatic match of the load. The automatic load matching device achieves the automatic load matching, and has the advantages of being high in precision, fast in speed and easy to operate, the generated direct current and even-order harmonic waveforms meet the standard requirements and ensure accurate test results.

Automatic load matching device used for electric energy meter direct current and even-order harmonic influence test

The utility model provides an on - -spot parameter record appearance of electric energy meter, includes that voltage sample module, current sample module, AD analog -to -digital conversion module, AD sampling method select module, data receiver module and data processing module. AD analog -to -digital conversion module is connected respectively to voltage sample module and current sample module to connect data receiver module through AD analog -to -digital conversion module, data receiver module and data processing module interconnection, AD sampling method selects the module to connect AD analog -to -digital conversion module, data receiver module and data processing module respectively. The utility model provides a pair of on - -spot parameter record appearance of electric energy meter can realize voltage, the electric current switching measuring range of complete machine, and realizes selecting to decide sampling method and doubling of frequency sampling method frequently, is an on -the -spot parameter record appearance that possesses big switching measuring range, wide sampling frequency, high sampling precision, can be used to the electric energy meter scene parameter record under the complex environments such as impact, nonlinearity.

On --spot parameter record appearance of electric energy meter

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Method for preventing external constant magnetic field interference to intelligent electric meter

Automatic load matching device used for electric energy meter direct current and even-order harmonic influence test

On --spot parameter record appearance of electric energy meter