Current mutual inductor with shunt resistor

Abstract

The invention discloses a current instrument transformer provided with a shunt resistance and used on an electric energy meter, belonging to a device for measuring the current. The objective is to provide a current instrument transformer with strong capacity of resisting disturbance, small volume, low cost and separated input and output. The current instrument transformer comprises connecting conductors, the shunt resistance, the current instrument transformer, a primary conductor of the current instrument transformer; the two connecting conductors are fixedly interconnected as a whole through the shunt resistance; two ends of the primary conductor of the current instrument transformer are respectively connected with a connection conductor, the primary conductor of the current instrument transformer traverses the current instrument transformer; the current instrument transformer is composed of windings with iron cores or magnetic cores. The invention has the characteristics of reliable clamping, convenience in operation, safety in working, and meanwhile, the invention does not need much artificial intervention in the process of testing.

Description

technical field [0001] The invention relates to a current transformer with a shunt resistance used in an electric energy meter, which belongs to a device for measuring current. Background technique [0002] Existing technologies use two types of devices in current measurement: one type is a purely resistive shunt. The other type is a transformer with an iron core coil or an air core coil. The pure resistance measurement device has the problem that the current loop and the measurement unit cannot be electrically isolated, the safety is poor, and the anti-interference ability is weak. However, the one with a coil needs a large-volume current transformer for large current measurement, and the transformer has the problem of magnetic field saturation, which causes the problems of large product size and high product cost. Contents of the invention [0003] The object of the present invention is to overcome the disadvantages of the prior art, and provide a current transformer w...

AI Technical Summary

Problems solved by technology

The pure resistance measurement device has the problem that the current loop and the measurement unit cannot be electrically isolated, the safety is poor, and the anti-interference ability is weak

However, the one with a coil needs a large-volume current transformer due to the large current measurement, and the transformer has the problem of magnetic field saturation, which causes the problem of large product size and high product cost.

Images