CN203481034U

CN203481034U - Open type current transformer

Info

Publication number: CN203481034U
Application number: CN201320546808.0U
Authority: CN
Inventors: 裘坚强; 杜根祖
Original assignee: NINGBO TONGHE TRANSFORMER CO Ltd
Current assignee: NINGBO TONGHE TRANSFORMER CO Ltd
Priority date: 2013-09-04
Filing date: 2013-09-04
Publication date: 2014-03-12
Anticipated expiration: 2023-09-04

Abstract

The utility model discloses an open type current transformer, and relates to the field of current transformers. The open type current transformer comprises an upper poured body, a lower poured body, an upper iron core and a lower iron core. The upper iron core and the lower iron core are respectively arranged in the upper poured body and the lower poured body, the upper iron core is butted to the lower iron core, an insulating layer is arranged on the upper iron core or the lower iron core, a secondary winding is wound in the upper iron core or the lower iron core, and binding posts are arranged on the upper poured body or the lower poured body and are connected with the upper iron core or the lower iron core. Compared with the prior art, the open type current transformer has the advantages that measured wires do not need to be cut off when the open type current transformer is mounted, the open type current transformer can work in a live manner, and accordingly current transformer mounting and maintenance can be greatly facilitated; currents of high-voltage lines can be measured by the aid of the open type current transformer, and voltages of the currents which can be measured by the aid of the open type current transformer can reach 10KV; the measured wires and the iron cores have equal potential, and shielding measures are adopted, so that the insulating strength and the partial discharge performance of the current transformer meet standard requirements, the safety performance of the current transformer can be improved, and the service life of the current transformer can be prolonged.

Description

Open Type Electric Current Mutual Inductor

Technical field

The utility model relates to a kind of current transformer, relates in particular to a kind of Open Type Electric Current Mutual Inductor.

Background technology

Current transformer is electric elements very important in electric power system.Current transformer principle is very similar to transformer, and current transformer effect is that conversion system high voltage appearance, large electric current are low-voltage, normalized current.Be widely used in current measurement, electric energy metrical, signal sampling and the Microcomputer Protection of AC electric power systems power consumption equipment.The occupation mode of current current transformer is a kind of is tested cable need to be blocked and could install, installing/dismounting is very inconvenient, another kind is straight-through current transformer, though do not need in use cable to block, but while installing, cable must be penetrated in transformer iron core hole, installing cables and instrument transformer must carry out simultaneously.

Summary of the invention

The utility model is for deficiency of the prior art, a kind of Open Type Electric Current Mutual Inductor is provided, not only make the performance of instrument transformer meet national standard and ICE standard, can also greatly facilitate the I&M of current transformer, improve the useful life of the security performance summation current transformer of current transformer.

In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals: Open Type Electric Current Mutual Inductor, comprise upper body, lower pour mass, be arranged on upper core and lower core in upper body and lower pour mass, described upper core docks with described lower core, on described upper core or described lower core, be provided with insulating barrier and be wound with secondary winding, on described upper body or described lower pour mass, be provided with binding post, described upper core or described lower core are connected with described binding post.Arrange like this, iron core is divided into upper core and lower core two parts, and upper core and lower core are placed on respectively in upper body and lower pour mass.Upper body and upper core are all epoxy resin one-time cast-formings, and lower pour mass and lower core are all epoxy resin one-time cast-formings.Upper body can be separated with lower pour mass, just very convenient when so tested wire being installed.After being provided with insulating barrier on iron core, be wound around secondary winding, the inside and outside all shielding iron cores of secondary winding reduce partial discharge again.Upper core or lower core are connected with the binding post being arranged on upper body or lower pour mass simultaneously, binding post and tested wire join, like this iron core just with tested wire equipotential, guarantee that insulating properties reaches standard-required, improved the useful life that fail safe has extended current transformer.

In technique scheme, preferred, on the lower core of stating, be provided with described insulating barrier, on described insulating barrier, be wound with described secondary winding.Arrange like this, be enclosed with insulating barrier on lower core, secondary winding is wrapped on lower core, guarantees like this insulating properties between iron core and secondary winding.

In technique scheme, preferably, described upper body both sides are provided with set bolt, on described lower pour mass, are provided with the bolt hole matching with described set bolt, set bolt described in one of them is connected with upper core by wire, plays the effect of described binding post.Arrange like this, between upper body and lower pour mass, can carry out the fixing of upper and lower pour mass with set bolt, one of them set bolt can be connected with iron core by wire simultaneously, plays the effect of binding post, so just binding post need to be set separately on upper body again.

In technique scheme, preferred, on described lower pour mass, be provided with some layers of insulation full skirt.Arrange like this, be provided with some layers of insulator umbrella, ensure enough creepage distances.

In technique scheme, preferred, described upper core can be in-line or semicircle or half rectangle.

In technique scheme, preferred, described lower core can be semicircle or half rectangle or U-shaped.

In technique scheme, preferred, described upper core and described lower core contact-making surface are smooth smooth.Arrange like this, the smooth smooth energy guaranteed performance of upper core and lower core contact-making surface, mentions precision.

Compared with prior art, the beneficial effects of the utility model are: while 1) installing, not only do not need to block tested wire, can also live line working, and greatly facilitate the I&M of current transformer.2) can realize the measurement to high voltage line current, the voltage that can survey electric current can reach 10KV.3) tested wire and iron core equipotential and take shielding measure to make the dielectric strength of current transformer and partial discharge reach standard-required, improved the useful life of the security performance summation current transformer of current transformer.

Accompanying drawing explanation

Fig. 1 is the utility model embodiment 1 front schematic view.

Fig. 2 is the utility model embodiment 1 schematic front perspective view.

Fig. 3 is the utility model Fig. 2 A place schematic diagram.

Fig. 4 is the utility model embodiment 2 perspective diagrams.

Fig. 5 is the utility model embodiment 3 perspective diagrams.

Embodiment

Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.

Embodiment 1:

Shown in Fig. 1, Fig. 2 and Fig. 3, Open Type Electric Current Mutual Inductor, comprises in upper body 1, lower pour mass 2, upper body 1 and is provided with upper core 6, in lower pour mass 2, is provided with lower core 7.In the middle of upper body 1 is rear with lower pour mass 2 combinations, there will be through hole 3, through hole 3 can allow tested wire pass.Upper core 6 presents semicircle, and lower core 7 presents half rectangle, is provided with resilient coating, screen and insulating barrier on lower core 7, and then secondary winding 11 is wrapped on lower core 7 again, guarantees insulation between secondary winding 11 and lower core 7.Upper body 1 and upper core 6 are all to use poured with epoxy resin moulding, and lower core 7, secondary winding 11 and lower pour mass 2 are also poured with epoxy resin moulding.First make compared to existing technology housing, then iron core with poured with epoxy resin in housing, the utility model adopts poured with epoxy resin moulding, has increased substantially the dielectric strength of current transformer.

On lower pour mass 2, be also provided with two connectors 5, secondary winding 11 is connected with two connectors 5.Upper body 1 both sides are provided with set bolt 8, on lower pour mass 2, be provided with the bolt hole 10 matching with set bolt 8, on the contact-making surface of one of them set bolt 8 and upper body 1, be provided with metallic gasket 12, metallic gasket 12 bottoms are connected with upper core 6 by wire 13.In the utility model, by external wire, be communicated with tested wire, then place external wire between set bolt 8 and metallic gasket 12, the bolt 8 that is tightened makes external wire be fixed on metallic gasket 12, upper core 6 is just connected to form equipotential with tested wire like this, solve electric discharge problem, improved the useful life of current transformer.Lower pour mass 2 is outside equipped with three-layer insulated full skirt 4, ensures enough creepage distances.Lower core 7 is smooth smooth with the contact-making surface of upper core 6, and after

upper body

1 and 2 combinations of lower pour mass, lower core 7 can form complete closed magnetic circuit with upper core 6.Lower core 7 is used cold rolled silicon steel with upper core 6 is general, but can in the instrument transformer of little current ratio, use microcrystallizing alloy material manufacture iron core 7 and upper core 6 to guarantee precision.

Embodiment 2: shown in Figure 4, and Open Type Electric Current Mutual Inductor, lower core 7 is U-shaped, and upper core 6 is half rectangle, and secondary winding 11 is wrapped on lower core 7.Other features are similar to embodiment 1.

Embodiment 3: shown in Figure 5, and Open Type Electric Current Mutual Inductor, lower core 7 is semicircle, and upper core 6 is in-line, and secondary winding 11 is wrapped on lower core 7.Other features are similar to embodiment 1.

Claims

1. Open Type Electric Current Mutual Inductor, comprise upper body (1), lower pour mass (2), be arranged on upper core (6) and lower core (7) in the lower pour mass (2) in upper body and (1), it is characterized by, described upper core (6) docks with described lower core (7), on described upper core (6) or described lower core (7), be provided with insulating barrier and be wound with secondary winding (11), on described upper body (6) or described lower pour mass (7), be provided with binding post, described upper core (6) or described lower core (7) are connected with described binding post.

2. Open Type Electric Current Mutual Inductor according to claim 1, is characterized by, and is provided with described insulating barrier on described lower core (7), is wound with described secondary winding (11) on described insulating barrier.

3. Open Type Electric Current Mutual Inductor according to claim 1, it is characterized by, described upper body (1) both sides are provided with set bolt (8), on described lower pour mass (2), be provided with the bolt hole (10) matching with described set bolt (8), set bolt described in one of them (8) is connected with upper core (6) by wire (13), plays the effect of described binding post.

4. Open Type Electric Current Mutual Inductor according to claim 3, is characterized by, and is provided with some layers of insulation full skirt (4) on described lower pour mass (2).

5. Open Type Electric Current Mutual Inductor according to claim 2, is characterized by, and described upper core (6) can be in-line or semicircle or half rectangle.

6. Open Type Electric Current Mutual Inductor according to claim 2, is characterized by, and described lower core (7) can be semicircle or half rectangle or U-shaped.

7. according to the Open Type Electric Current Mutual Inductor described in claim 2 or 5 or 6, it is characterized by, described upper core (6) and described lower core (7) contact-making surface are smooth smooth.