Instrument capable of automatically identifying specifications of current transformers and setting transformation ratio

Abstract

The invention discloses an instrument capable of automatically identifying specifications of current transformers and setting a transformation ratio. The instrument comprises an instrument body, a connecting line and N current transformers with the same specification, wherein the instrument body is provided with a current transformer interface, the current transformer interface is a (2N + 2) core interface, two cores are resistance identification ends, the first-end wiring terminal of the connecting line is a wiring terminal corresponding to the core wire of the current transformer interface, the connecting line is connected with the current transformer interface through the first-end wiring terminal, the second-end wiring terminal of the connecting line is divided into N wiring terminals in one-to-one correspondence with the current transformers, each current transformer is internally provided with a circuit board, an interface on the circuit board is connected with the corresponding wiring terminal in the second-second wiring terminal, the circuit board is provided with a resistance position for installing a resistor, the circuit boards of the current transformers with different specifications are provided with resistors with different resistance values, the resistance value of the resistor of one current transformer is identified through the resistance identification ends of the two cores, and the transformation ratio is automatically set according to the identified resistance value of the resistor.

Description

technical field [0001] The invention relates to an instrument, in particular to an instrument which can automatically identify the specification of a current transformer and set the transformation ratio. Background technique [0002] The instrument needs to be connected with an external current transformer when measuring a large current. Current transformers of different specifications have different transformation ratios. When the instrument is configured with current transformers of different specifications, different transformation ratios need to be set. Manual settings are required during production, which affects production. efficiency, and it is prone to setting errors caused by human negligence; when the instrument is installed on site and needs to change the current transformer specification, the instrument transformation ratio needs to be reset, which needs to be manually set by professionals, and often requires external equipment to set, and the steps are cumbersome...

AI Technical Summary

Problems solved by technology

[0002] The instrument needs to be connected with an external current transformer when measuring a large current. Current transformers of different specifications have different transformation ratios. When the instrument is configured with current transformers of different specifications, different transformation ratios need to be set. Manual settings are required during production, which affects production. efficiency, and it is prone to setting errors caused by human negligence; when the instrument is installed on site and needs to change the current transformer specification, the instrument transformation ratio needs to be reset, which needs to be manually set by professionals, and often requires external equipment to set, and the steps are cumbersome

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