CN201489999U

CN201489999U - High-linearity precise current transformer with fixing device

Info

Publication number: CN201489999U
Application number: CN200920132646XU
Authority: CN
Inventors: 巩小明; 周平江
Original assignee: SHENZHEN CITY CHUANGYIN INDUSTRY Co Ltd
Current assignee: SHENZHEN CITY CHUANGYIN INDUSTRY Co Ltd
Priority date: 2009-06-09
Filing date: 2009-06-09
Publication date: 2010-05-26
Anticipated expiration: 2019-06-09

Abstract

The utility model discloses a high-linearity precise current transformer with a fixing device, which comprises an annular iron core and a secondary winding wound on the annular iron core. The iron core and the secondary winding are both casted inside an epoxy resin layer, and a busbar or a wire to be tested passes through the ring core hole of the transformer. The high-linearity precise current transformer is characterized in that the current transformer also comprises a fixed current transformer arranged on the outer surface of the epoxy resin layer, and a fixing device arranged in the position corresponding to the busbar or wire to be tested. Meanwhile, the iron core adopts high-quality nanometer crystalline alloy with high magnetic conductivity and low saturation induction density. The high-linearity precise current transformer has the obvious advantages of good linearity and high precision.

Description

The high linearity precision current instrument transformer of band fixture

Technical field

The utility model relates to current measurement instrument, relates in particular to a kind of high linearity precision current instrument transformer of band fixture of measurement circuitry size of current.

Background technology

Current transformer is applied to line current widely and is measured, present current transformer adopts circulus, and test line passes the through hole in the ring, because through-hole wall is smooth smooth, the relative position of current transformer and test line is difficult for fixing, influences certainty of measurement easily.

The utility model content

The utility model is the defective that will solve above-mentioned prior art, designs the high linearity precision current instrument transformer of a kind of energy fixed current instrument transformer and test line relative position.

For solveing the technical problem, the technical scheme that the utility model proposes is a kind of high linearity precision current instrument transformer with fixture of design, comprise: a kind of high linearity precision current instrument transformer with fixture, comprise annular core, be wrapped in the secondary winding on the annular core; Described iron core and secondary winding all are cast in the epoxy resin layer, and tested busbar or lead pass the instrument transformer core opening; Current transformer also comprises: the fixture that is arranged on the fixed current instrument transformer and the tested busbar relative position of epoxy resin layer outer surface.

Fixture comprises in one embodiment: what place the instrument transformer end face is the circular top cover of thin slice, and what place the instrument transformer bottom surface is the circular drain pan of thin slice, places the connection top cover of described core opening and the tube connector in a tubular form of drain pan; Stretch out a pair of jut to described core opening center is parallel respectively on the half of sidewall of described tube connector correspondence, this is the thickness of tested busbar to the distance between the jut outer wall.Described tube connector is provided with a groove on the sidewall away from described jut.

Extend the shape portion 5 of colluding of a fixing tested busbar to described core opening at drain pan described in the preferred embodiment 2.

The connecting line of described secondary winding extends described epoxy resin layer.

Described iron core adopts the high-quality nanometer crystal alloy of high magnetic permeability, low saturation induction density.

Compared with prior art, the utility model is provided with the fixture of fixed current instrument transformer and test line relative position, and iron core adopts the high-quality nanometer crystal alloy of high magnetic permeability, low saturation induction density.The monomer that is applicable to little electric current is measured.Have that good linearity, precision height, insulation property are strong, protection against the tide is shockproof, volume is little, in light weight, be easy to advantage such as integrated installation.

Description of drawings

Below in conjunction with drawings and Examples the utility model is made detailed explanation, wherein:

Fig. 1 is the front view of the utility model preferred embodiment;

Fig. 2 is the left view of the utility model preferred embodiment;

Fig. 3 is the rearview of the utility model preferred embodiment.

Embodiment

Fig. 1 to Fig. 3 shows the appearance structure of the utility model preferred embodiment, the utility model comprises: annular core, twine the secondary winding on the annular core, seal the epoxy resin layer of iron core and secondary winding, be arranged on the fixture of the fixed current instrument transformer and the tested busbar relative position of epoxy resin layer outer surface.Tested busbar or lead pass the instrument transformer core opening.The connecting line 6 of secondary winding extends described epoxy resin layer.

Fixture comprises: what place the instrument transformer end face is the circular top cover of thin slice 1, and what place the instrument transformer bottom surface is the circular drain pan of thin slice 2, places the connection top cover 1 of core opening and the tube connector in a tubular form 3 of drain pan 2.Stretch out a pair of jut 4 to the looping pit center is parallel respectively on the half of sidewall of tube connector 3 correspondences, this is the thickness of tested busbar to the distance between jut 4 outer walls.Tested busbar places between 4 juts during installation, and the relative position of instrument transformer and busbar is fixed.

Tube connector 3 is provided with a groove 7 on the sidewall away from jut 4, its effect is at erection stage, and instrument transformer increases activity space when wearing busbar and running into the busbar corner, so that pass smoothly.In preferred embodiment, also be provided with a shape portion 5 of colluding on the drain pan 2 to the extended fixing tested busbar of core opening.Tested busbar has a protrusion, colludes shape portion 5 and blocks this protrusion, plays the fixedly effect of busbar.The position of colluding shape portion 5 can not occupy the installing space of busbar.

Iron core adopts the high-quality nanometer crystal alloy of high magnetic permeability, low saturation induction density, and through special magnetic field treated.

The utlity model has the measuring accuracy height, the linearity is good, operating frequency range is wide, plurality of advantages such as stable and reliable for performance, response is rapid can be applicable in the equipment of instrument and meters such as electric energy meter, electric power meter verification, electrical energy meter calibration instrument, oscilloscope, digital multimeter, two jaw type earth resistance tester, two jaw type phase voltammetric meters.

Below in conjunction with specific embodiments the utility model is described, but the those of ordinary skill in the present technique field can be made numerous variations or modification to these execution modes, these variations and modification should fall within the scope of the utility model protection.

Claims

1. the high linearity precision current instrument transformer with fixture comprises annular core, is wrapped in the secondary winding on the annular core; Described iron core and secondary winding all are cast in the epoxy resin layer, and tested busbar or lead pass the instrument transformer core opening; It is characterized in that also comprising: the fixture that is arranged on the fixed current instrument transformer and the tested busbar relative position of epoxy resin layer outer surface.

2. current transformer as claimed in claim 1, it is characterized in that: described fixture comprises: what place the instrument transformer end face is the circular top cover of thin slice (1), what place the instrument transformer bottom surface is the circular drain pan of thin slice (2), places the connection top cover (1) of described core opening and the tube connector in a tubular form (3) of drain pan (2); Respectively to the parallel a pair of jut (4) that stretches out in described core opening center, this is the thickness of tested busbar to the distance between jut (4) outer wall on the half of sidewall of described tube connector (3) correspondence.

3. current transformer as claimed in claim 2 is characterized in that: described tube connector (3) is provided with a groove (7) on the sidewall away from described jut (4).

4. current transformer as claimed in claim 3 is characterized in that: described drain pan (2) extends the shape portion of colluding (5) of a fixing tested busbar to described core opening.

5. current transformer as claimed in claim 1 is characterized in that: the connecting line of described secondary winding (6) extends described epoxy resin layer.

6. as each described current transformer of claim 1 to 5, it is characterized in that: described iron core adopts the high-quality nanometer crystal alloy of high magnetic permeability, low saturation induction density.