Multi-range and multi-station high-precision current signal source circuit

Abstract

The invention discloses a multi-range and multi-station high-precision current signal source circuit. Single-station current signals sent out by a high-precision three-phase standard source are processed by a current transformer isolation array, a range selection circuit and a current proportioning operational amplifier conditioning circuit. First, the current transformer isolation array divides a single-station current signal source into current signal sources of five stations (the number of stations configured depends on the maximum power sent out by a single phase of the three-phase standard source, and five stations in the actual application is taken as an example in the invention); then, the range is selected for the current signal sources of five stations through switching of a relay; and finally, through the modulation function of the current proportioning operational amplifier conditioning circuit, the consistency, high linearity and high accuracy of the current signal sources of five stations are ensured. The work efficiency of the detection device is increased five times. The efficiency of quality detection of tested products is ensured, and the production cost is lowered. The multi-range and multi-station high-precision current signal source circuit has practical use value.

Description

technical field [0001] The invention relates to a circuit in the field of detection technology, which is applied to the detection of intelligent switching electrical devices, specifically, it provides a multi-range and multi-position high-precision current signal source circuit for intelligent switching electrical devices to detect Whether the protection function of the intelligent switching appliance can work normally in practical applications. Background technique [0002] For the quality inspection of intelligent switching electrical products, such as CW series circuit breakers, CM series releases, etc., it is necessary to connect and break the power system functions and check the equipment for various faults such as overload, undervoltage, short circuit and ground fault. The protection control function is tested at the factory. The detection device needs to provide various analog voltage and current signals to be input into the intelligent switching electrical products ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the prior art that high-efficiency detection of multiple positions of intelligent switching electrical products cannot be realized at the same time, the present invention proposes and designs a multi-range and multi-position high-precision current signal source circuit, and applies it in practice Improved detection efficiency and accuracy

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