CN205828127U - A kind of threephase current transformer - Google Patents

Abstract

nullA kind of threephase current transformer，It is characterized in that: by silicon steel core ring (1)、Insulating sheath (2)、Enamel-covered wire (3)、Screen layer (4)、Resistance (5)、Shell (6)、Four core lead-out wires (7)、Upper cover (8)、Base plate (9) and epoxy resin composition，Same number of turns enamel-covered wire is rotating around being formed on the silicon steel core ring of three additional insulating sheaths 2 three absolute coils of composition，Lead-out wires of coil is drawn with line feeder respectively，Resistance (5) is connected in parallel on lead-out wires of coil two ends，One layer of screen layer (4) of each coil outer wrapping，Screen layer welds lead-out wire on (4)，Three assemble coil and put in shell correspondence position，Respectively line lead-out wire in coil core is connect four core lead-out wires red、Green、Yellow、It is black that the core outside line of three coils connects four core lead-out wires，The shielded lead of three coils connects quad screen layer，Inside epoxy resin encapsulated，Cover upper cover (8)，Rear mounting bedplate (9) is cemented in shell (6) bottom with glue.

Description

A kind of threephase current transformer

Technical field

This utility model relates to a kind of three-phase transformer, relates more specifically to a kind of threephase current transformer, input signal Input for electric current, be output as the threephase current transformer of voltage output.Input overload capacity 10 times is specified, belongs to power electronics and sets Standby technical field.

Background technology

On market, threephase current transformer mostly is electric current input, and input current scope is little, anti-saturation ability, and mostly is electricity Stream output type, to take voltage signal, needs external sampling resistor to realize.Simultaneously because the special process of transformer, seldom have Increasing the current transformer product of screen layer, anti-electromagnetic interference capability is poor.

The present invention is primarily to solve the problems referred to above.

Utility model content

The purpose of this utility model is to provide a kind of threephase current transformer, and lead-in wire is drawn, had screen layer, simultaneously outside coil Built-in sampling resistor, is drawn by line quad, and its production technology is simple, and compact conformation is aesthetic in appearance.A kind of three-phase electricity Current transformer, is characterized in that: drawn by silicon steel core ring 1, insulating sheath 2, enamel-covered wire 3, screen layer 4, resistance 5, shell 6, four core Outlet 7, upper cover 8, base plate 9 and epoxy resin composition, same number of turns enamel-covered wire is rotating around the silicon being formed on three additional insulating sheaths 2 Constituting three absolute coils on steel core ring, lead-out wires of coil is drawn with line feeder respectively, and resistance 5 is connected in parallel on lead-out wires of coil two End, one layer of screen layer 4 of each coil outer wrapping, screen layer 4 welds lead-out wire, three assemble coil and put into shell correspondence position In putting, respectively line lead-out wire in coil core is connect the core outside line red, green, yellow, three coils of four core lead-out wires and connects four core lead-out wires Black, the shielded lead of three coils connects quad screen layer, inside epoxy resin encapsulated, covers upper cover 8, cements with glue Rear mounting bedplate 9 is bottom shell 6.

Accompanying drawing explanation

Fig. 1 is the substep figure of a coil winding

Fig. 2 is the installation diagram of coil and shell

Fig. 3 is the semi-finished product figure after lead-out wires of coil and the connection of four core shielding lines

Fig. 4 is the finished figure assembling upper cover after embedding

Fig. 5 is the product figure after assembling shell bottom plate

Fig. 6 is Disassembling Products explosive view

Detailed description of the invention

Technical problem of the present utility model can solve by taking following measure, illustrates below in conjunction with the accompanying drawings:

Insulating sheath 2 is molded, by insulating sheath symmetry two parts phase by symmetrical two parts PP fire-resistant engineering plastics Outer fixing around one layer of insulating tape being buckled on silicon steel core ring 1, silicon steel core ring 1 installs after insulating sheath at ring exterior paint The thousand of circle of envelope curve coiling, draws with line feeder and solid at coil external adhesive tape respectively by the tail head that rises of enamel-covered wire after coiling Fixed, welding kesistance 5, it is wound around one layer of screen layer 4 outside coil and draws with line feeder.Shell 6 is molded with fire-resistant engineering plastics, Being used for installing coil with three symmetrical punching cylinders in shell, enclosure bottom is with the card matched for mounting base 9 Groove, the overall dimensions of upper cover 8 matches with shell 6 and is molded by fire-resistant engineering plastics, and upper cover 8 has and shell 6 punching cylinder The through hole matched, the other correspondence of each through hole in outside of upper cover 8 indicates capitalization A, B, C, and base plate 9 is by fire-resistant engineering plastics Being molded, base plate matches with enclosure bottom draw-in groove.Each threephase current transformer needs above 3 identical coils, by 3 Individual coil is respectively put in shell 6, and now coil correspondence upper cover 8 indicates A, B, C.The four of band screen layer selected by four core lead-out wires 7 Core wire, four core colors are the most red, green, yellow, black, respectively by loop A, B, C core in line connect four core lead-out wires 7 red, green, Yellow, the core outside line of three coils connects that four core lead-out wires are black, and the shielded lead of three coils connects quad screen layer, uses epoxy material After embedding, cover upper cover 8 glue and cement rear mounting bedplate 9 bottom shell 6, make a totally enclosed device.

The beneficial effects of the utility model are: according to this utility model, this transformer compared with original transformer owing to adopting Design with built-in sampling resistor and screen layer, decrease the design of peripheral circuit during use, be provided with anti-electromagnetism simultaneously The advantages such as interference performance is strong, and precision is high, compact conformation, greatly facilitate the use of client, and layman are more attractive, easy for installation, It is particularly suitable in industrial control system using.

As a representative instance of the present utility model, it is for instance possible to use stalloy ring size is (31*37-20), ferrum Core protective case material is PP fire-resistant engineering plastics, and with the enamel-covered wire of 0.18mm at outer coiling 1850 circle of ring, load resistance selects 5.1 Ω/1W accuracy class is two parallel connections of 1 ‰, and screen layer selects the Copper Foil of a size of 140*5*0.05, and lead-out wire is 0.2mm²4 The a length of 305cm of core ribbon shielding line, can obtain most preferred embodiment of the present utility model.

Performance parameter is shown in Table one:

Table one

Product type	It is suitable for rated current	Parameter	Phase shift	Nonlinearity	Pressure (kV)
						STA3137-01	20A ＜ Ie≤80A	800A/1.1V	≤60’	≤ 0.5%	≥4

Claims (5)

1. a threephase current transformer, is characterized in that: by silicon steel core ring (1), insulating sheath (2), enamel-covered wire (3), shielding Layer (4), resistance (5), shell (6), four core lead-out wires (7), upper cover (8), base plate (9) and epoxy resin composition, same number of turns paint Envelope curve is rotating around being formed on the silicon steel core ring of three additional insulating sheaths 2 three absolute coils of composition, and lead-out wires of coil is respectively Drawing with line feeder, resistance (5) is connected in parallel on lead-out wires of coil two ends, one layer of screen layer (4) of each coil outer wrapping, screen layer (4) welding lead-out wire on, three assemble coil and put in shell correspondence position, respectively line lead-out wire in coil core connect four cores It is black that lead-out wire is red, green, yellow, the core outside line of three coils connects four core lead-out wires, and the shielded lead of three coils connects quad screen Cover layer, inside epoxy resin encapsulated, cover upper cover (8), cement rear mounting bedplate (9) in shell (6) bottom with glue.

A kind of threephase current transformer the most according to claim 1, is characterized in that: insulating sheath (2) is by symmetrical two parts It is molded with PP fire-resistant engineering plastics, insulating sheath symmetry two parts is buckled in relatively silicon steel core ring (1) upper outer around one layer Insulating tape is fixed.

A kind of threephase current transformer the most according to claim 1, is characterized in that: shell (6) is noted with fire-resistant engineering plastics Moulding and form, be used for installing coil with three symmetrical punching cylinders in shell, enclosure bottom is with for mounting base (9) phase The draw-in groove coordinated.

A kind of threephase current transformer the most according to claim 1, is characterized in that: the overall dimensions of upper cover (8) and shell 6 Matching and be molded by fire-resistant engineering plastics, upper cover (8) has the through hole matched with shell (6) punching cylinder, upper cover (8) The other correspondence of each through hole in outside indicates capitalization A, B, C.

A kind of threephase current transformer the most according to claim 1, is characterized in that: band shielding selected by four core lead-out wires (7) The quad material of layer.