CN112038076A

CN112038076A - Open-type current transformer

Info

Publication number: CN112038076A
Application number: CN202011101974.0A
Authority: CN
Inventors: 吴兴燕; 杜桂芬; 卜炫帅
Original assignee: Jiangsu Jingjiang Transformer Co ltd
Current assignee: Jiangsu Jingjiang Transformer Co ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2020-12-04

Abstract

The invention discloses an open-type current transformer, which comprises a transformer body a and a transformer body b; an iron core a is arranged inside the mutual inductor body a, an iron core b is arranged inside the mutual inductor body b, and the mutual inductor body a and the mutual inductor body b are connected through a connecting piece; the iron core is characterized in that an elastic sheet is arranged between the iron core a and the shell a; the iron core a is popped up or retracted under the action of the elastic sheet; a secondary winding is arranged on the iron core b and is led out through a secondary terminal 9 of the shell b; the iron core b is fixedly arranged, and two end faces of the iron core b respectively exceed the end face of the shell b by 1 mm; the shell a and the shell b are symmetrically provided with fixing devices, each fixing device comprises an arched clamping plate, two ends of each clamping plate are arranged into rectangular planes, and an anti-slip strip is arranged on the arched inner surface in the middle of each clamping plate; the clamping plate is fixed on the fixed seats of the shell a and the shell b through fastening screws. The mutual inductor closing device has the advantages of simple structure, convenience in use and operation, time saving, higher precision in mutual inductor closing, and convenience in installation and fixation; the performance stability of the transformer is ensured.

Description

Open-type current transformer

Technical Field

The invention relates to the field of transformers, in particular to an open-type current transformer for automatic transformation of distribution networks and rural power networks.

Background

With the rapid development of economic construction in China and the improvement of the living standard of people, the requirements on the power quality and the power supply reliability of a power distribution network are higher and higher, so that the automation transformation of the urban and rural power distribution network is continuously and deeply developed. Many switchhouses, looped netowrk cabinet that have operated, current transformer need add in order to adapt to distribution network automation transformation demand not dispose current transformer originally. The work faces a plurality of problems of no position, difficult construction, difficult power failure and the like. A split open-type mutual inductor is produced by cutting a cable or a busbar from the middle, clamping the cable or the busbar from two sides, fixing and fastening the cable or the busbar by a steel belt without power failure, and is accepted by the market. However, in the actual installation process of the mutual inductor, the following disadvantages still exist: 1. the transformer has a split structure, two halves of the transformer are completely separated, and the precision of the transformer is greatly influenced if the two halves are not aligned during installation; 2. when an installer operates, two halves of the mutual inductor need to be aligned and leveled and are tightened by a steel belt, so that the operation is inconvenient and the efficiency is not high; 3. the iron core divided into two halves is fixed by the hose clamp, the contact surface of the iron core is influenced by temperature difference in four seasons and expansion and contraction, so that the precision stability of the mutual inductor is poor 4. when the mutual inductor is fixed on a cable or a copper bar, the inner rubber ring cannot be adjusted, and the fixing effect is not ideal.

Disclosure of Invention

The invention aims to provide an open-type current transformer which is simple in structure, convenient to use and operate, time-saving, high in precision of mutual inductor involution and convenient to install and fix; the technical problem is solved.

In order to achieve the technical purpose and achieve the technical requirements, the invention adopts the technical scheme that: an open-type current transformer comprises a transformer body a and a transformer body b; an iron core a is arranged inside the mutual inductor body a, an iron core b is arranged inside the mutual inductor body b, and the mutual inductor body a and the mutual inductor body b are connected through a connecting piece; the iron core is characterized in that an elastic sheet is arranged between the iron core a and the shell a; the iron core a is popped up or retracted under the action of the elastic sheet; a secondary winding is arranged on the iron core b and is led out through a secondary terminal 9 of the shell b; the iron core b is fixedly arranged, and two end faces of the iron core b respectively exceed the end face of the shell b by 1 mm; the shell a and the shell b are symmetrically provided with fixing devices, each fixing device comprises an arched clamping plate, two ends of each clamping plate are arranged into rectangular planes, and an anti-slip strip is arranged on the arched inner surface in the middle of each clamping plate; the clamping plate is fixed on the fixed seats of the shell a and the shell b through fastening screws.

Preferably: the connecting piece comprises a rotating pin shaft arranged at one connecting end of the mutual inductor body a and the mutual inductor body b; the other connecting end of the mutual inductor body a and the mutual inductor body b is provided with a locking device; the locking device is matched with the clamping grooves formed in one sides of the shells of the mutual inductor body a and the mutual inductor body b.

Preferably: the elastic sheet is arched, and the bending degree of the elastic sheet is greater than that of the iron core; ensuring smooth extension and contraction of the iron core.

Preferably: the end surface of the shell a is provided with a stepped spigot, and the end surface of the shell b is provided with a lug matched with the spigot; so that the joint of the joint surfaces is more consistent.

Preferably: the fixing seat comprises two side plates, two connecting plates are arranged between the two side plates, an adjusting nut is arranged in a gap between the two connecting plates, and a fastening screw penetrates through a limiting hole in the connecting plate to be connected with the clamping plate; can be adjusted independently and is convenient to use.

Preferably: the clamping grooves of the mutual inductor body a and the mutual inductor body b are symmetrically arranged, the two clamping grooves are combined to form a straight line shape, and the end parts of the clamping grooves are arranged to be round with the diameter larger than the width of the clamping grooves; the locking effect is good, and the falling-off is not easy.

Preferably: the locking device is arranged into a locking block which is arranged into a T shape; the end part of the locking block is matched with the step on the outer side of the clamping groove; not occupying space and being beautiful.

The invention has the beneficial effects; an open-type current transformer, compare with traditional structure: one side of the mutual inductor body a and one side of the mutual inductor body b are matched into a hinge type for connection, two halves of the mutual inductor are not completely separated, the iron cores are aligned and level, and the speed is high; an elastic sheet is arranged between the iron core a and the shell a; the iron core a can be popped up or retracted under the action of the elastic sheet; the iron core b is fixedly arranged, and two end faces of the iron core b respectively exceed the end face of the shell b by 1 mm; when the iron cores are combined, the exceeding part of the iron core b can apply pressure to the iron core a, so that the iron core combination accuracy is higher; two ends of a clamping plate of the fixing device arranged on the shell are arranged into rectangular planes, and an arched inner surface in the middle of the clamping plate is provided with an anti-slip strip; the function is comprehensive, and not only can the mutual inductor be firmly fixed on the cable, but also the mutual inductor can be firmly fixed on the busbar; the locking device is matched with the clamping grooves formed in one sides of the shells of the mutual inductor body a and the mutual inductor body b, so that the mutual inductor is better in structural stability, convenient to operate, capable of saving operation time and good in locking effect.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a second schematic structural diagram of the present invention;

in the figure: 1. rotating the pin shaft; 2. a mutual inductor body a; 2-1, a shell; 3. a fixed seat; 3-1, side plate; 3-2, connecting plates; 3-3, adjusting the nut; 3-4, fastening screws; 4. clamping a plate; 4-1. antislip strip; 5. a card slot; 6. a spring plate; 7-1, iron core a; 7-2. iron core b; 8. a locking device; 9. a secondary terminal; 10. a transformer body b; 10-1. a shell b; 11. stopping the opening; 12. and (4) a bump.

Detailed Description

In order to make the objects, technical solutions and advantageous technical effects of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments;

in the accompanying fig. 1-2: an open-type current transformer comprises a transformer body a2, a transformer body b 10; an iron core a7-1 is arranged inside the transformer body a2, an iron core b7-2 is arranged inside the transformer body b10, and the transformer body a2 is connected with the transformer body b10 through a connecting piece; the connecting piece comprises a rotating pin shaft 1 arranged at one connecting end of the mutual inductor body a and the mutual inductor body b; the other connecting ends of the transformer body a2 and the transformer body b10 are provided with a locking device 8; the locking block 8-1 of the locking device is arranged in a T shape; the locking device 8 is matched with a slot 5 arranged at one side of the shell of the mutual inductor body a2 and the mutual inductor body b 10; the end part of the locking block 8-1 is matched with the step 8-2 at the outer side of the clamping groove; stable in structure and saves space. An elastic sheet 6 is arranged between the iron core a7-1 and the shell a 2-1; the elastic sheet 6 is arranged to be arched, and the bending degree of the elastic sheet 6 is greater than that of the iron core a 7-1. The iron core a7-1 is ejected or retracted under the action of the elastic sheet 6, so that the iron core combination is better attached; the iron core b7-2 is provided with a secondary winding which is led out through a secondary terminal 9 of the shell b 10-1; the iron core b7-2 is fixedly arranged, and two end faces of the iron core b7-2 respectively exceed the end face of the shell b10-1 by 1 mm; the exceeding part forms a pressure on the iron core a, and the iron core a generates a reaction force under the action of the elastic sheet, so that the iron core a and the iron core b are attached more tightly; the shell a2-1 and the shell b10-1 are symmetrically provided with fixing devices, each fixing device comprises an arched clamping plate 4, two ends of each clamping plate are provided with rectangular planes, and an arched inner surface in the middle of each clamping plate 4 is provided with an anti-slip strip 4-1; the arched part is matched with the fixed seats at the two sides, and the mutual inductor can be firmly fixed on the cable by adjusting and pressing; the clamping plate 4 is fixed on the fixed seats 3 of the shell a2-1 and the shell b10-1 through fastening screws. The rectangular plane part of the clamping plate is matched with the fixing seats on the two sides, and the mutual inductor can be firmly fixed on the busbar by adjusting and pressing; the fixing seat 3 comprises two side plates 3-1, two connecting plates 3-2 are arranged between the two side plates 3-1, the adjusting nut 3-3 is arranged in a gap between the two connecting plates 3-2, and the fastening screw 3-4 penetrates through a limiting hole in the connecting plate 3-2 to be connected with the clamping plate 4. The method has the advantages of simple structure, reliable connection, convenient and reliable installation, and can realize the installation of the mutual inductor in various occasions.

The end face of the shell a2-1 is provided with a stepped spigot 11, and the end face of the shell b10-1 is provided with a lug 12 matched with the spigot. The iron core joint surface can effectively prevent dust, liquid and the like from entering the iron core joint surface, plays a role in protection and ensures the stable performance of the mutual inductor.

The clamping grooves 5 of the mutual inductor body a2 and the mutual inductor body b10 are symmetrically arranged, the two clamping grooves 5 are combined to form a straight line shape, and the end parts of the clamping grooves 5 are round pin holes with diameters larger than the widths of the clamping grooves. The locking effect is good, and the falling-off is not easy.

The foregoing examples are given solely for the purpose of illustrating the invention and are not to be construed as limiting the embodiments, and other variations and modifications in form thereof will be suggested to those skilled in the art upon reading the foregoing description, and it is not necessary or necessary to exhaustively enumerate all embodiments and all such obvious variations and modifications are deemed to be within the scope of the invention.

Claims

1. An open-type current transformer comprises a transformer body a (2) and a transformer body b (10); an iron core a (7-1) is arranged inside the mutual inductor body a (2), an iron core b (7-2) is arranged inside the mutual inductor body b (10), and the mutual inductor body a (2) is connected with the mutual inductor body b (10) through a connecting piece; the method is characterized in that: an elastic sheet (6) is arranged between the iron core a (7-1) and the shell a (2-1); the iron core a (7-1) is popped up or retracted under the action of the elastic sheet (6); a secondary winding is arranged on the iron core b (7-2) and is led out through a secondary terminal (9) of the shell b (10-1); the iron core b (7-2) is fixedly arranged, and two end faces of the iron core b (7-2) respectively exceed the end faces of the shell b (10-1) by 1 mm; the shell a (2-1) and the shell b (10-1) are symmetrically provided with fixing devices, each fixing device comprises an arched clamping plate (4), two ends of each clamping plate are arranged to be rectangular planes, and an anti-slip strip (4-1) is arranged on the arched inner surface in the middle of each clamping plate (4); the clamping plate (4) is fixed on the fixed seats (3) of the shell a (2-1) and the shell b (10-1) through fastening screws.

2. The open-type current transformer according to claim 1, wherein: the connecting piece comprises a rotating pin shaft (1) arranged at one connecting end of the mutual inductor body a and the mutual inductor body b; the other connecting end of the mutual inductor body a (2) and the mutual inductor body b (10) is provided with a locking device (8); the locking device (8) is matched with a clamping groove (5) arranged on one side of the shell of the mutual inductor body a (2) and the mutual inductor body b (10).

3. The open-type current transformer according to claim 1, wherein: the elastic sheet (6) is arched, and the bending degree of the elastic sheet (6) is greater than that of the iron core a (7-1).

4. The open-type current transformer according to claim 1, wherein: the end face of the shell a (2-1) is provided with a stepped spigot (11), and the end face of the shell b (10-1) is provided with a lug (12) matched with the spigot.

5. The open-type current transformer according to claim 1, wherein: the fixing seat (3) comprises two side plates (3-1), two connecting plates (3-2) are arranged between the two side plates (3-1), the adjusting nut (3-3) is arranged in a gap between the two connecting plates (3-2), and the fastening screw (3-4) penetrates through a limiting hole in the connecting plate (3-2) to be connected with the clamping plate (4).

6. The open-type current transformer according to claim 2, wherein: the mutual inductor comprises a mutual inductor body a (2) and a mutual inductor body b (10), wherein clamping grooves (5) of the mutual inductor body a (2) and the mutual inductor body b (10) are symmetrically arranged, the two clamping grooves (5) are combined to form a straight line shape, and the end parts of the clamping grooves (5) are round pin holes with diameters larger than the widths of the clamping grooves.

7. The open-type current transformer according to claim 2, wherein: the locking device (8) is arranged into a locking block (8-1), and the locking block (8-1) is arranged into a T shape; the end part of the locking block (8-1) is matched with the step (8-2) at the outer side of the clamping groove.