Open-close type current and voltage transformer

Abstract

The invention discloses an open-close type current and voltage transformer which comprises a current transformer and a voltage sampler, wherein the voltage sampler is mounted on one side of the current transformer through a T-shaped bulge and a T-shaped groove on the side surface of the current transformer, and the relative positions of the current transformer and the voltage sampler can be determined through two fixing pieces and the bulge on the current transformer. As an upper housing and a lower housing of the current transformer comprise mounting holes which can be fastened by using nuts and screw rods, thereby being convenient to enable the upper housing and the lower housing to form a closed combined whole during the use. The whole current and voltage transformer can be combined by adopting the screw rods and the nuts, thereby simultaneously having the function of sampling voltage signals. A groove structure is adopted at the joint of two C-shaped iron cores and matched with a resin housing with orthogonal grooves, the connection is reliable, the good closing of a magnetic circuit is ensured and the requirements on the measurement precision can be met.

Description

technical field [0001] The invention relates to a current and voltage detection device of a power system, in particular to a split current and voltage transformer. Background technique [0002] Current transformers and voltage transformers are used for current and voltage detection in power systems. They have the functions of electrical isolation and voltage-current conversion, and have a wide range of applications. Chinese patent ZL 200810074348 discloses a feed-through current transformer that is convenient for taking voltage, and the method is to directly take the voltage signal by piercing the insulation layer of the wire. Chinese patent ZL 200820124089 discloses a split-type transformer, which has a split-type transformer core, and the joint of the iron core is in the shape of a tooth. Chinese patent ZL 200910222101 also discloses a magnetic circuit open-close current transformer, in which the joints of the iron cores of the open-close transformer have a single-row zig...

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Problems solved by technology

[0003] 1. It is inconvenient to install when the feed-through current transformer takes the voltage signal

[0004] 2. The open-close current transformer is easy to install, but it is necessary to add a voltage transformer when the voltage signal is used

[0005] 3. The contact of the iron core connection of the split-type transformer is unreliable, and it cannot be guaranteed that the connection meets the measurement accuracy requirements during installation.

[0006] 4. In the existing split-type transformer, only half of the iron core is provided with windings, which affects the accuracy of the measured current

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