CN201741564U

CN201741564U - Epoxy-resin vacuum-pouring dry-type current transformer

Info

Publication number: CN201741564U
Application number: CN2010202639996U
Authority: CN
Inventors: 江元科; 董国鹏; 王峰; 王维贤; 邹德帅
Original assignee: Hubei Dalian No2 Instrument Technology Co Ltd
Current assignee: Hubei Dalian No2 Instrument Technology Co Ltd
Priority date: 2010-07-20
Filing date: 2010-07-20
Publication date: 2011-02-09
Anticipated expiration: 2020-07-20

Abstract

The utility model relates to an epoxy-resin vacuum-pouring dry-type current transformer, which includes an iron core, a primary coil, a secondary coil and an insulation casing, wherein the iron core includes a first iron core and a second iron core; the primary coil is manufactured through winding copper strips; the secondary coil includes a first coil and a second coil; and both the first coil and the second coil are manufactured through the independent winding of enamelled wires. The first coil and the second coil are mounted on the iron core after insulated, the first coil corresponds to the first iron core, the second coil corresponds to the second iron core, and the iron core, the primary coil and the secondary coil are all poured in an insulated casing in the vacuum state. The current transformer has the advantages as follows: a totally-closed wall structure is adopted; all coils of the transformer are poured in the vacuum state; the quantity of partial discharge is low, the electrical strength is high, the insulating property is good, the volume is small, the material is saved, the service life is long and the oil-free environmental protection is realized.

Description

A kind of epoxide resin vacuum cast dry-type current transformer

Technical field

The utility model relates to the current transformer field, particularly a kind of epoxide resin vacuum cast dry-type current transformer.

Background technology

Current transformer is to convert big electric current to standard little electric current by fixed proportion, and it is carried out the device of electric energy metrical and measurement.But existing current transformer volume is bigger than normal, and the bad partial discharge value that causes of insulation property is higher, and useful life is short.

The utility model content

The purpose of this utility model is a kind of epoxide resin vacuum cast dry-type current transformer that provides at above-mentioned deficiency.

The technical scheme that adopts is: a kind of epoxide resin vacuum cast dry-type current transformer comprises iron core, primary winding, secondary coil and insulation shell.

Its technical essential is: iron core is made up of first iron core and second iron core.First iron core is a measurement level iron core; Second iron core is the protected level iron core, and first iron core and second iron core are staggered relatively, wraps up twill strap, silicone band and electrician's adhesive plaster successively as inner insulating layer outside first iron core and second iron core.

Secondary coil is made up of first coil and second coil, and two coils form by the coiling of enamelled wire independence.Polyester film is wrapped on first coil as first external insulation layer, again semiconductive crimped paper is wrapped on first external insulation layer as the secondary shielding layer; Again polyester film is wrapped on second coil as second external insulation layer, again semiconductive crimped paper is wrapped on second external insulation layer as the 3rd screen.First coil and second coil is staggered relatively, because having the ability of conduction, semiconductive crimped paper secondary shielding layer and the 3rd screen can be connected, form the integral body that current potential is identical, secondary shielding layer and the 3rd screen are by secondary support ground connection.The space that forms between inner insulating layer, secondary shielding layer and the 3rd screen is a wire winding layer, and first coil and second coil are installed on the iron core, and enamelled wire is positioned at wire winding layer.First coil is for measuring a level coil, and second coil is as the protected level coil, corresponding first iron core of first coil, corresponding second iron core of second coil.The leading-out terminal of first coil is drawn from first binding post and second binding post of insulation shell respectively, and the leading-out terminal of second coil is drawn from the 3rd binding post and the 4th binding post of insulation shell respectively.Insulation shell is provided with installing hole, and installing hole and support are integrative-structures.

Primary winding is formed by the copper strips coiling, is wound on the iron core.Primary winding is outer with respect to secondary coil,, semiconductive crimped paper is wrapped on the resilient coating as first screen as resilient coating at primary winding outer wrapping crimped paper again.Primary winding is connected with copper circle terminal block with conducting copper respectively.

Insulation shell is 1: 0.75: 0.25 by epoxy resin, acid anhydrides, flexibilizer and silicon powder according to proportioning: 2.6 make.Iron core, primary winding and secondary coil all are cast in the insulation shell under vacuum state.

When a kind of epoxide resin vacuum cast dry-type current transformer moves, primary winding is shielded in high pressure one side by first screen, secondary coil is shielded at earth potential by secondary shielding layer and the 3rd screen, the partial discharge value reduces by 70% than single winding shielding in the past, satisfies the requirement of relevant criterion to local discharging level fully.

Technical parameter: model: LFZB-10

Electric pressure: 10kV

Current ratio: 5～1500A/5

Level is inferior: (0.2S) 0.5/10P

Capacity: 10/15VA

Frequency: 50HZ

Device classification: indoor

Its advantage is: the utility model is totally-enclosed wall-penetrating type structure, is applicable to that indoor 50HZ, rated voltage are in 10KV and the following power circuit and equipment thereof, play the measurement of electric current, electric energy and the effect of relaying protection.All coils is all poured into a mould under vacuum state, and local discharging level is low, electrical strength is high, good insulation preformance, with original same parameter current transformer mutually specific volume little, save material, the life-span is long and do not have oil ring and protect.All material is H level heat proof material, satisfies the fire protection requirement of fire department.

Description of drawings

Fig. 1 is a kind of epoxide resin vacuum cast dry-type current transformer internal structure schematic diagram.

Fig. 2 is that a kind of epoxide resin vacuum cast dry-type current transformer K is to view.

Fig. 3 is a kind of front view of epoxide resin vacuum cast dry-type current transformer.

Embodiment:

A kind of epoxide resin vacuum cast dry-type current transformer comprises primary winding 2, secondary coil 3 and insulation shell 4.

Iron core 1 is made up of first iron core 5 and second iron core 6.First iron core 5 adopts the ultracrystallite iron core for measuring the level iron core, realizes high sensitivity thereby initial magnetic permeability is not less than 65000Gs/Oe, improves certainty of measurement, reduces the loss of power department; Second iron core 6 is the protected level iron core; the silicon steel sheet that adopts high saturation magnetic flux density is after 780 ℃ of annealing of vacuum; the silicon steel sheet magnetic property is returned to optimum state; make silicon steel sheet unlikely too early appearance saturated phenomenon under overcurrent situations; and parameter changes in the reflection system that can be correct; guarantee that protective device can reliably start, the design magnetic flux density is 1.5T.First iron core 5 and second iron core 6 are staggered relatively, wrap up twill strap, silicone band and electrician's adhesive plaster successively as inner insulating layer 7 outside first iron core 5 and second iron core 6.

Secondary coil 3 is made up of first coil 8 and second coil 9, and two coils form by the coiling of enamelled wire independence.Polyester film is wrapped on first coil 8 as first external insulation layer 10, again semiconductive crimped paper is wrapped on first external insulation layer 10 as secondary shielding layer 24; Again polyester film is wrapped on second coil 9 as second external insulation layer 11, semiconductive crimped paper is wrapped on second external insulation layer 11 as the 3rd screen 12 again.First coil 8 and second coil 9 is staggered relatively, because having the ability of conduction, semiconductive crimped paper secondary shielding layer and the 3rd screen can be connected, form the integral body that current potential is identical, secondary shielding layer 24 and the 3rd screen 12 are by secondary support 13 ground connection.The space that forms between inner insulating layer 7, secondary shielding layer 24 and the 3rd screen 12 is that wire winding layer 23, the first coils 8 and second coil 9 are installed on the iron core 1, and enamelled wire is positioned at wire winding layer 23.First coil 8 is for measuring the level coil, and second coil 9 is as the protected level coil, and first coil 8 and second coil 9 is staggered relatively, first coil, 8 corresponding first iron core, 5, the second coils, 9 corresponding second iron cores 6.Insulation shell 4 is provided with installing hole 14, and installing hole 14 is integrative-structures with support 13.The leading-out terminal of first coil 8 is drawn from first binding post 19 and second binding post 20 of insulation shell 4 respectively, and second coil, 9 leading-out terminals are drawn from the 3rd binding post 21 and the 4th binding post 22 of insulation shell 4 respectively.

Primary winding 2 is formed by copper strips 25 coilings, is wound on the iron core 1.Primary winding 2 is outer with respect to secondary coil 3,, semiconductive crimped paper is wrapped on the resilient coating 15 as first screen 16 as resilient coating 15 at primary winding 2 outer wrapping crimped papers again.Primary winding 2 is connected with copper circle terminal block 18 with conducting copper 17 respectively.

Insulation shell 4 is 1: 0.75: 0.25 by epoxy resin, acid anhydrides, flexibilizer and silicon powder according to proportioning: 2.6 vacuum pourings form.Iron core 1, primary winding 2 and secondary coil 3 all are cast in the insulation shell 4 under vacuum state.

Claims

1. an epoxide resin vacuum cast dry-type current transformer comprises iron core (1), primary winding (2), secondary coil (3) and insulation shell (4), it is characterized in that:

Iron core (1) is made up of first iron core (5) and second iron core (6), and first iron core (5) and second iron core (6) are staggered relatively, wraps up twill strap, silicone band and electrician's adhesive plaster successively as inner insulating layer (7) outside first iron core (5) and second iron core (6);

Secondary coil (3) is made up of first coil (8) and second coil (9), and two coils form by the coiling of enamelled wire independence; Polyester film is wrapped in first coil (8) goes up, again semiconductive crimped paper is wrapped in first external insulation layer (10) and goes up as secondary shielding layer (24) as first external insulation layer (10); Again polyester film is wrapped in second coil (9) and goes up, again semiconductive crimped paper is wrapped in second external insulation layer (11) and goes up as the 3rd screen (12) as second external insulation layer (11); First coil (8) and second coil (9) is staggered relatively, and secondary shielding layer (24) and the 3rd screen (12) are by secondary support (13) ground connection; The space that forms between inner insulating layer (7), secondary shielding layer (24) and the 3rd screen (12) is wire winding layer (23), and first coil (8) and second coil (9) are installed on the iron core (1), and enamelled wire is positioned at wire winding layer (23); First coil (8) and second coil (9) are staggered relatively, corresponding first iron core of first coil (8) (5), corresponding second iron core of second coil (9) (6), the leading-out terminal of first coil (8) is drawn from first binding post (19) and second binding post (20) of insulation shell (4) respectively, and the leading-out terminal of second coil (9) is drawn from the 3rd binding post (21) and the 4th binding post (22) of insulation shell (4) respectively;

Primary winding (2) is formed by copper strips (25) coiling, is wound on the iron core (1); Primary winding (2) is outer with respect to secondary coil (3),, semiconductive crimped paper is wrapped in resilient coating (15) again and goes up as first screen (16) as resilient coating (15) at primary winding (2) outer wrapping crimped paper; Primary winding (2) is connected with copper circle terminal block (18) with conducting copper (17) respectively.

2. a kind of epoxide resin vacuum cast dry-type current transformer according to claim 1, it is characterized in that: insulation shell (4) is provided with installing hole (14), and installing hole (14) is an integrative-structure with support (13).