Multifunctional electronic transformer calibrator

Abstract

A multifunctional electronic transformer calibrator comprises an analog signal conditioning module, a high-precision data acquisition module, a network interface module, a synchronous clock module, a FPGA module, a digital signal processing and storage module, a display and keyboard module and a general standard interface module. The FPGA module comprises an AD control and storage module, a synchronization control module, a net port control and storage module and a data control center module. The multifunctional electronic transformer calibrator of the invention adopts a DSP+FPGA framework. Electronic transformer calibration equipment possessing a power factor angle measurement function and an error code detection function is realized. According to the equipment, an electromagnetic transformer can be taken as a standard transformer or the electronic transformer can be taken as the standard transformer. An analog electronic transformer can be verified and a digital electronic transformer can be verified too. The size is small. Operation is easy and on-site verification is convenient.

Description

Technical field: [0001] The invention relates to the technical field of electronic transformer calibration in power systems, in particular to a multifunctional electronic transformer calibrator in digital substations, which is suitable for calibrating the measurement accuracy of transformers in substations. As well as the measurement of the power factor angle, it can also detect whether there is an error in the communication channel. Background technique: [0002] The importance of electricity to a country is self-evident, as the carrier of electricity, the stable operation of the power system must be guaranteed. Power transformers play the role of energy metering and relay protection in the power grid, which is crucial to ensure the normal operation of the power grid. The transformer calibrator is a special precision instrument used to test the error of the transformer, so the development of a high-precision transformer calibrator is particularly important. [0003] Drive...

AI Technical Summary

Problems solved by technology

Their output mainly differs in the following three aspects: 1) Electromagnetic power transformers can be divided into electromagnetic voltage transformers and electromagnetic current transformers according to different test objects, and the effective values ​​of their secondary side outputs are respectively 57.7V and 1A / 5A, electronic transformers can also be divided into electronic current transformers and electronic voltage transformers, but their output standard values ​​are 1.625V~6.5V and 22.5mV~4V respectively, which can be It can be seen that the output signals of the two transformers are very different

2) Electronic transformers can have digital signal output interfaces, while traditional electromagnetic power transformers do not have digital interfaces

3) The testing principles of electromagnetic transformers and electronic transformers are different. Electromagnetic transformers are manufactured based on the principle of electromagnetic induction, but there are some fatal shortcomings, such as bulky and bulky, magnetic saturation, small dynamic range and difficulty in insulation design. Based on modern sensing technology and optoelectronic technology, the electronic transformer is small in size, high in testing accuracy, and convenient for digital networking and installation

[0006] Although there are many types of transformer calibrators on the market and the technology is mature, looking at the market, it is compatible with analog electronic transformers and digital electronic transformers for calibration, and can use electronic transformers as standard multi-functional small Calibration systems are still rare

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