The invention discloses a method for detecting alternating current-direct current standard-based direct current resistance performance of a current transformer According to the method, the alternating current-direct current standard-based direct current resistance performance of the current transformer is detected by using an alternating current-direct current standard current transformer, a current booster, a voltage sampling circuit, diodes, four-terminal precision resistors, and a circuit formed by connecting the components; and the method comprises the following steps of detecting the ratio difference of the current transformer, and detecting phase difference By the method, when the transformation error of the current transformer under the half-wave current is detected, two diodes of which the forward breakover current is greater than the rated current of the current transformer are connected in series in positive and negative directions to form a positive half-wave current which flows through the current transformer TAx to be tested, and the other negative half-wave current directly returns to the current booster, so that an alternating current booster can work in the state of sine waves The problem that a technical means for detecting the direct current resistance performance of the current transformer is not provided at present can be solved effectively; and the method has the advantages of simplicity, scientificity, practicability and the like and is suitable for detecting the direct current resistance of the current transformer

Method for detecting alternating current-direct current standard-based direct current resistance performance of current transformer

Direct measuring method of magnetic saturation margin of current transformer based on scaling converter

The invention provides an online detection method of the error of a current transformer and belongs to the field of online detection of electrical equipment. The online detection method of the error of the current transformer is used for detecting the error of the current transformer on line. Construction of a smart power grid in China requires online detection of conditions of equipment in a continual or timing mode. At present, the technology of online detection of the insulation property of the current transformer is relatively mature, but a good method has not be found for online detection of the error characteristics. According to the online detection method of the error of the current transformer, in a current transformer box body, a standard winding is further sleeved outside a primary winding to be parallel to an existing measuring winding and an existing protective winding, current signal samplers are connected among all secondary windings and a public terminal box in an insulating mode, the multi-path samplers are fixed together to form a sampler set to be installed in the public terminal box, the output terminals of all the samplers are connected with an electronic transformer calibrator, and finally the error value of the measuring winding and the error value of the protective winding are obtained on line in real time.

Online detection method of error of current transformer

The invention discloses a current transformer checking system of alternating current-direct current double power supplies. The current transformer checking system comprises an alternating current-direct current power supplying unit, a man-machine interaction unit, a data processing unit, a testing signal output unit, a secondary signal collecting unit and a primary signal collecting unit, wherein the alternating current-direct current power supplying unit inputs a direct current power supply or an alternating current power supply, and outputs a direct current power supplying power supply, the man-machine interaction unit is connected with the data processing unit, the data processing unit is used for executing testing commands and processing testing data, the testing signal output unit exerts testing signals to a secondary winding of a current transformer, the secondary signal collecting unit is connected with the secondary winding of the current transformer for collecting secondary signals, and the primary signal collecting unit is connected with a primary winding of the current transformer for collecting primary signals. The current transformer checking system has the advantages that the portability is high, the work efficiency is high, the anti-jamming capability is high, the safety is good, and the testing on the transformation ratio, the errors and the relevant parameters of the current transformer can be effectively carried out.

Current transformer checking system of alternating current-direct current double power supplies

The present invention discloses a device of automatic zero setting and zero detection for verification of a current transformer on the basis of a current comparator The device of automatic zero setting and zero detection for verification of the current transformer on the basis of the current comparator comprises a voltage regulator, a current booster, a tested current transformer, an auxiliary transformer, a current comparator, a current transformer calibrator, an electronic zero setting box, a current load box and a computer The voltage regulator is connected with the current booster, and the of the current booster is connected with the tested current transformer and the auxiliary transformer; the current comparator is connected between the tested current transformer and the auxiliary transformer, and the auxiliary transformer, the current comparator and the tested current transformer are respectively connected with corresponding interfaces of the current transformer calibrator; the auxiliary transformer is connected with the electronic zero setting box, the tested current transformer is connected with the current load box, and the data communication terminal of the current transformer calibrator is connected with the communication terminal of the computer; and the first load regulation serial port of the current transformer calibrator is connected with the control terminal of the electronic zero setting box, the second load regulation serial port of the current transformer calibrator is connected with the control terminal of the current load box, and the control serial port of the voltage regulator of the current transformer calibrator is connected with the control terminal of the current transformer calibrator According to the invention, the automatic verification of a high precision current transformer is realized

Device and method of automatic zero setting and zero detection for verification of current transformer on the basis of current comparator

The invention relates to a circuit for checking on-site accuracy of a current transformer under the condition of underload operations, comprising a test power supply, a voltage regulator, a power current transformer, a current transformer to be tested, a standard current transformer, a comparison type current transformer checking meter, a current comparator, a load box and a null indicator. In the circuit for checking the on-site accuracy of the current transformer under the condition of the underload operations, the on-site accuracy of the current transformer under the condition of the underload operations is checked by utilizing a magnetic potential balance method, therefore, a measurement error of the current transformer which works below 1% of rated current can be accurately measured, and the defect of the traditional method is effectively compensated. The circuit provided by the invention has the advantages of simple structure and convenience for use, and the measurement error of the current transformer can be directly read through the comparison type current transformer checking meter.

Circuit for checking on-site accuracy of current transformer under condition of underload operations

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Circuit for checking on-site accuracy of current transformer under condition of underload operations