Open-close current transformer provided with electromagnetic shielding layer and assembly method thereof

Abstract

The invention provides an open-close type current transformer provided with an electromagnetic shielding layer, comprising a first housing, a second housing, a winding and an iron core, wherein the first housing and the second housing are hinged with each other through a hinge arranged at one end; the other ends of the first housing and the second housing are connected in a stopper fitting manner;an electromagnetic shielding layer is arranged on each of the inner walls of the first housing and the second housing, and the first output line and the second output line of the winding are connected in parallel with a bidirectional diode through lead terminals. The invention also provides an assembly method of the current transformer. A current transformer winding lead is connected in parallelwith a diode, bidirectional diodes are integrated with current transformers as circuit protection elements, so that additional arrangement of a protection device is saved. A current transformer is used as a measuring element to realize two functions of measurement and protection. The housings of the current transformer are hinged after being clamped. The assembly method is simple and the current transformer can be disassembled and assembled repeatedly after being assembled wrong, which has wide practicability.

Description

technical field [0001] The invention relates to the technical field of electrical measurement, in particular to a split current transformer provided with an electromagnetic shielding layer and an assembly method thereof. Background technique [0002] Current transformer is a kind of current conversion equipment, which converts a large current into a secondary small current, and is used for measuring instruments, protection devices, etc. Under normal operating conditions, the output voltage of the current transformer is very low, and the secondary side is almost short-circuited. Once the secondary side is open, a high voltage will be generated at both ends of the open circuit, which often causes spark discharge sound and smoke. And the phenomenon of burning, too high voltage has caused a great threat to equipment and people. At the same time, the core loss will increase and generate heat, or even burn out the insulation. [0003] At present, the current transformer secondar...

AI Technical Summary

Problems solved by technology

However, there are very few protection devices on the secondary side of current transformers, and they are generally independent of the current transformer equipment. In addition, the protection devices are independent of the current transformer equipment, and there are connection points between the secondary output of the current transformer and the protection device. If the contact is poorly connected due to the operation of the on-site staff, it will not play a protective role.

Secondly, for split current transformers, the internal iron core generally needs to be movable, so it cannot be fixed by filling materials such as glue. The winding of the transformer is directly wound on the iron core and then led to the transformer shell without filler support. , the lead wire of the winding is easy to loosen or fall off under tension

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