CN207765247U

CN207765247U - A kind of Rogowski coil current transformer

Info

Publication number: CN207765247U
Application number: CN201721746953.8U
Authority: CN
Inventors: 白陈均
Original assignee: FUJIAN CHUANGSIFANG ELECTRONICS Co Ltd
Current assignee: FUJIAN CHUANGSIFANG ELECTRONICS Co Ltd
Priority date: 2017-12-14
Filing date: 2017-12-14
Publication date: 2018-08-24
Anticipated expiration: 2027-12-14

Abstract

The utility model discloses a kind of Rogowski coil current transformers, including toroidal core, draw guide card, magnetic strength conducting wire, shell, the magnetic strength conducting wire is wrapped on the toroidal core, toroidal core is two, two toroidal cores are overlapped mutually, magnetic strength conducting wire is wrapped on two toroidal cores, two toroidal cores are coaxially set on the position-limiting tube inside housing hollow, the top of shell is equipped with the lead-out groove for drawing guide card, the inner surface of lead-out groove is equipped with the lead screw thread of magnetic strength conducting wire, extraction guide card is respectively welded in the head and the tail both ends of magnetic strength conducting wire, the fixed seat of housing bottom is equipped with spacing bayonet.The utility model can improve the voltage signal that Rogowski coil induces relative to cored current transformer, and mitigation is influenced by external environment stray magnetic field, and strong with anti-saturation ability, and precision is high, compact-sized, the simple feature of manufacture craft.

Description

A kind of Rogowski coil current transformer

Technical field

The utility model belongs to electronic component transformer technical field, and in particular to a kind of Rogowski coil current transformer.

Background technology

Current transformer, it is cored, usually the high current of primary side is transformed into the low current on secondary side, then passes through I/V Transformation is input to ADC samplings.Rogowski coil mutual inductor does not have iron core, Faraday's electromagnetic induction law is namely based on, directly in pair Side generates voltage signal.For current transformer, since Rogowski coil does not have iron core, core sataration phenomenon is not present, Prodigious electric current can directly be measured, but just because of it does not have an iron core, the voltage signal that Rogowski coil induces is relative to there is iron It is very faint for the current transformer of core, and it is highly susceptible to the influence of external environment stray magnetic field, therefore Roche line The requirement enclosed to technique for coiling is very high.In addition, the voltage signal that Rogowski coil induces, cannot be directly used as electric current letter Number, it is necessary to it differentiates to it, can just revert back the current signal that you want.Rogowski coil is only used for especially big electricity at present The occasion of stream, general measuring instrument are all to use current transformer.

Such as Chinese patent application（Notification number：CN204088029U）Disclose " a kind of resin support element of mutual inductor and The mutual inductor made of support element ", it is characterized in that including cylindrical tubular body, the left and right sides in main body is equipped with the mother of protrusion Wire casing；The mutual inductor that a kind of resin support element with above-mentioned mutual inductor makes, including annular core, be wound on iron core around Group, the ring of annular core is interior to be equipped with mutual inductor resin support element, and mutual inductor resin support element includes the tubular body of cylinder, main Internal left and right sides is equipped with the bus duct of protrusion, and the outer wall of bus duct is withstood on winding, annular core, winding and mutual inductor resin Support element poured with epoxy resin one, forms pour mass.The utility model mutual inductor resin support element is applied on mutual inductor, Winding bias and exposed can be prevented, good product consistency simplifies technique, improves product quality, has certain promotion price Value, but it is a lack of necessary fire-retardant part and magnetic wire output port.

Invention content

In order to solve prior art deficiency, the utility model provides a kind of Rogowski coil current transformer, including annular magnetic Core draws guide card, magnetic strength conducting wire, shell, and the magnetic strength conducting wire is wrapped on the toroidal core, the enclosure interior cavity Center is equipped with the position-limiting tube of the toroidal core, and the toroidal core is limited to the position-limiting tube inside the housing hollow On, the toroidal core is two, and two toroidal cores are overlapped mutually, and the magnetic strength conducting wire is wrapped in two annulars On magnetic core, two toroidal cores are coaxially set on the position-limiting tube inside the housing hollow, are set at the top of the shell There are the lead-out groove for drawing guide card, the inner surface of the lead-out groove to be equipped with the lead screw thread of the magnetic strength conducting wire, the magnetic strength The extraction guide card is respectively welded in the head and the tail both ends of conducting wire, and the fixed seat of the housing bottom is equipped with spacing bayonet.

Further, the spacing bayonet bottom is arcuate structure, and the spacing bayonet mouth width is 5mm, the limiting card Mouth depth 7.5mm.

Further, the slot inner width of the lead-out groove is 18 ~ 19mm, a length of 31 ~ 32mm in the slot of the lead-out groove, preferably Ground, the slot inner width of the lead-out groove are 18mm, a length of 31mm in the slot of the lead-out groove.

Further, ring is utilized after two toroidal cores are coaxially set on the position-limiting tube inside the housing hollow Epoxy resin embedding.

Further, the shell uses PVC fire-resistant engineering plastics or PBT fire-resistant engineering plastics, the fire-retardant works of preferably PVC Engineering plastics.

（2）Advantageous effect

The beneficial effects of the utility model：The toroidal core is overlapped mutually, and is coaxially set in the fire-retardant engineering plastics of PVC On the position-limiting tube of material shell body cavity inside, relative to cored current transformer, the electricity that Rogowski coil induces can be improved Signal, mitigation is pressed to be influenced by external environment stray magnetic field, the utility model has anti-saturation ability strong, and precision is high, structure Compact, manufacture craft is simple, and the more attractive remarkable advantage of layman compares and is suitble to use in industrial control system.

Description of the drawings

Fig. 1 is ring core structure schematic diagram；

Fig. 2 is the loop construction schematic diagram that coiling is completed；

Fig. 3 is the schematic diagram that Rogowski coil current transformer assembly is completed；

Fig. 4 is the schematic diagram of Rogowski coil current transformer shell.

Specific implementation mode

The utility model is further described with reference to embodiment.

Embodiment one

As shown in Figs 1-4, the implementation case provides a kind of Rogowski coil current transformer, including toroidal core 1, extraction Guide card 2, magnetic strength conducting wire 3, shell 4, the magnetic strength conducting wire 3 are wrapped on the toroidal core 1,4 internal cavities of the shell Center is equipped with the position-limiting tube of the toroidal core 1, and the toroidal core 1 is limited to the limit of 4 cavity inside of the shell Guan Shang, the toroidal core 1 are two, and two toroidal cores 1 are overlapped mutually, and the magnetic strength conducting wire 3 is wrapped in two institutes It states on toroidal core 1, two toroidal cores 1 are coaxially set on the position-limiting tube of 4 cavity inside of the shell, the shell 4 top is equipped with the lead-out groove 42 for drawing guide card 2, and the inner surface of the lead-out groove 42 is equipped with drawing for the magnetic strength conducting wire 3 Line screw thread, the head and the tail both ends of the magnetic strength conducting wire 3 are respectively welded the extraction guide card 2, in the fixed seat 41 of 4 bottom of the shell Equipped with spacing bayonet 43.

43 bottom of the spacing bayonet is arcuate structure, and 43 mouth width of the spacing bayonet is 5mm, and the spacing bayonet 43 is vertical Deep 7.5mm.The slot inner width of the lead-out groove 42 is 18mm, a length of 31mm in the slot of the lead-out groove 42, two annular magnetics Core 1 utilizes epoxy resin encapsulated after being coaxially set on the position-limiting tube of 4 cavity inside of the shell.The shell 4 is hindered using PVC Fire engineering plastics or PBT fire-resistant engineering plastics, preferably PVC fire-resistant engineering plastics.

Preferred embodiments of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field For technical staff, without departing from the concept of the premise utility, several deformations can also be made, improves and substitutes, this Belong to the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be with appended claims It is accurate.

Claims

1. a kind of Rogowski coil current transformer, including toroidal core（1）, draw guide card（2）, magnetic strength conducting wire（3）, shell（4）, The magnetic strength conducting wire（3）It is wrapped in the toroidal core（1）On, the shell（4）The center of internal cavities is equipped with described Toroidal core（1）Position-limiting tube, the toroidal core（1）It is limited to the shell（4）On the position-limiting tube of cavity inside, feature It is：The toroidal core（1）It is two, two toroidal cores（1）It is overlapped mutually, the magnetic strength conducting wire（3）It is wrapped in Two toroidal cores（1）On, two toroidal cores（1）Coaxially it is set in the shell（4）The limit of cavity inside Guan Shang, the shell（4）Top be equipped with the extraction guide card（2）Lead-out groove（42）, the lead-out groove（42）Inner surface Equipped with the magnetic strength conducting wire（3）Lead screw thread, the magnetic strength conducting wire（3）Head and the tail both ends the extraction guide card is respectively welded （2）, the shell（4）The fixed seat of bottom（41）It is equipped with spacing bayonet（43）.

2. a kind of Rogowski coil current transformer according to claim 1, it is characterised in that：The spacing bayonet（43）Bottom Portion is arcuate structure, the spacing bayonet（43）Mouth width is 5mm, the spacing bayonet（43）Depth 7.5mm.

3. a kind of Rogowski coil current transformer according to claim 1, it is characterised in that：The lead-out groove（42）Slot Inner width is 18 ~ 19mm, the lead-out groove（42）Slot in a length of 31 ~ 32mm.

4. a kind of Rogowski coil current transformer according to claim 1, it is characterised in that：Two toroidal cores （1）Coaxially it is set in the shell（4）Epoxy resin encapsulated is utilized after on the position-limiting tube of cavity inside.

5. a kind of Rogowski coil current transformer according to claim 1, it is characterised in that：The shell（4）Using PVC Fire-resistant engineering plastics or PBT fire-resistant engineering plastics.