Analytical equipment of frequency conversion electricity based on digital transmission

Abstract

The invention provides analytical equipment of frequency conversion electricity based on digital transmission. The analytical equipment contains a power unit, an analyzer and a communication unit. The power unit contains at least a power unit singleton which comprises a sampling part, a signal transformer, a signal conditioning part and an A / D converter which are successively connected in series. The analyzer contains a CPU module, an editable logic device, a high-speed buffer memory and a display screen. The CUP module is respectively connected with the display screen, the editable logic device and the high-speed buffer memory. A Discrete Fourier Transform (DFT) algorithm is arranged inside the CUP module. The editable logic device is connected with the A / D converter through the communication unit. The whole structure of the analytical equipment is simplified. As the power unit converts analog quantity to a digital signal for transmission, influence of transmission distance and electromagnetic environment is avoided, and precision of a system is raised. By integrating the CPU module, the editable logic device and the high-speed buffer memory, arithmetic speed and handling capacity are raised of the analytical equipment are raised, and the analytical equipment has high practicality.

Description

technical field [0001] The invention relates to the field of instruments, in particular to an analysis device for variable frequency electricity based on digital quantity transmission. Background technique [0002] The traditional power analyzer adopts the following method: the front-end sensor converts the voltage and current into a small signal (analog signal) acceptable to the secondary instrument, and the analog signal is transmitted to the secondary instrument through the cable for ratio conversion and display. So how to measure the measurement accuracy of the whole measurement system? According to the composition of the measurement system, the measurement accuracy of the system should be determined by the following three aspects: 1. The accuracy of the front-end sensor; 2. The interference and signal attenuation introduced by the transmission line; 3. The measurement accuracy of the secondary instrument. The sensor of this technology is connected with the secondary ca...

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Problems solved by technology

[0004] From a theoretical analysis, the existing frequency conversion instrument can adopt the following methods: see the attached figure 1 , part 1-2 of this structure is a whole, and part 1-2 is usually used as an independent instrument, and the digital transmission system is often realized by PCB, and the path is very short; part 1-1 and part 1-2 together constitute the analyzer system, The analog quantity transmission link between part 1-1 and part 1-2 uses cables, and the length of the cable is determined according to the needs of the test site, which is a link that is easy to introduce loss and interference; the structural part 1-1, part 1-2 and the analog Errors may be introduced in the quantity transmission link (mainly electromagnetic interference and signal attenuation and other factors), and the accuracy is not high; the system accuracy is determined by the voltage sensor, current sensor, transmission part, and secondary transmitter part, and many error links are introduced. Most of the equipment is suitable for the power frequency environment and is not suitable for the measurement of variable frequency power

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