Automatic conductor alternating current resistance testing device based on FPGA and current transformer electric bridge

Abstract

The invention relates to an automatic conductor alternating current resistance testing device based on an FPGA and a current transformer electric bridge, belongs to the technical field of cable operation and measurement, and aims to solve the problem that automatic measurement is completed under the conditions that the measurement precision is low, the repeatability is poor, the technical requirements for operators are high, and the precision cannot be guaranteed; according to the key technical points, the automatic conductor alternating current resistance testing device comprises an excitation power supply module, a voltage measurement module, a control module, a current comparison test module, a tested conductor, a current transformer and a conversion resistor, wherein one end of the excitation power supply module is connected with one end of the tested conductor, and the other end of the excitation power supply module is connected with the other end of the tested conductor through the current transformer; the two ends of the tested conductor are connected with the voltage measurement module separately; the other end of the voltage measurement module is connected with one end ofthe control module; and the other end of the control module is connected with the current comparison test module. The problems that the precision is low, the repeatability is poor, and the technical requirements for operators are high are solved; the full-automatic measurement of the alternating current resistance can be realized; and meanwhile, the full-automatic measurement of the inductance andthe quality factor can be realized.

Description

technical field [0001] The invention relates to the technical field of cable operation and measurement, in particular to an automatic conductor AC resistance test device based on an FPGA and a flow ratio bridge. Background technique [0002] The current carrying capacity of the AC transmission cable depends on the AC equivalent resistance and heat dissipation conditions of the conductor. The AC equivalent resistance is the effective resistance of the conductor to generate heat due to loss. The real part corresponds to the AC equivalent resistance. The AC equivalent resistance of the conductor is seriously increased due to the skin effect and the proximity effect. Today, the cable conductor cross section has reached 3500mm 2 , the magnitude of its resistance is roughly 10 -5 ~10 -6 (Ω / m), as an important parameter to evaluate cable performance and quantify power loss, the measurement technology of AC equivalent resistance is facing great challenges. At present, the acquisit...

AI Technical Summary

Problems solved by technology

Although it overcomes the manual operation of the bridge method and the technical requirements for operators, the acquisition of voltage signals and current signals is a direct measurement, and the measurement accuracy is very limited.

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