CN209328700U - A kind of current transformer - Google Patents

Abstract

A kind of current transformer, including current transformer, the current transformer is by protection cap, circuit box and mutual-inductance apparatus are constituted, mutual-inductance apparatus is provided between the protection cap and circuit box, the circuit box surface offers line interface, binding post one is welded with below the circuit box, binding post two, binding post three and binding post four, limit fastener is provided between the binding post two and binding post three, in the utility model, since volume reduces, so using multiple fixed card buckles and limit fastener to ensure that current transformer position will not cause the current transformer position fixed to change because of the reasons such as vibration or impact, interface has been opened up on circuit box, junction is arranged inside equipment, it newly added fusible link at top, and fusible link is connected at the first siding ring connecting for a long time with route, it keeps away Exempt to cause mutual inductance current variation to burn household electrical appliance since electric current is excessive in primary side route.

Description

A kind of current transformer

Technical field

The utility model belongs to current transformer technical field, specially a kind of current transformer.

Background technique

Primary side high current is converted into secondary side low current to measure according to electromagnetic induction principle by current transformer Instrument.Current transformer is made of the iron core and winding being closed.Her first side winding the number of turns is seldom, is connected on and needs to measure Electric current route in, therefore he often has whole electric currents of route to flow through, and secondary side winding turn ratio is more, is serially connected in measurement In instrument and protective loop, current transformer at work, its secondary side circuit always be closure, therefore measuring instrumentss and The impedance very little of protective loop series coil, for the working condition of current transformer close to short circuit, current transformer is primary side High current is converted into secondary side low current to measure, and secondary side can not open a way.The effect of current transformer is usually current transformation And electrical isolation.

Estimated current mutual inductor is for measuring route, reconciling electric current etc., but at present due to current transformer mostly Most volume is larger, it has not been convenient to be set up directly on inside equipment to reconcile electric current, so being utilized in equipment and power supply company mostly Current transformer is set between connecing, although this mode directly effective can adjust as needed size of current, due to The electric current of power supply, voltage are in metastable state at present, and equipment using electric current and be also in fixation using voltage Range, thus do not need to change the adjustable range of current transformer, therefore increase current transformer outside equipment to change The way of size of current just seems more troublesome, at present with greater need for be the Current Mutual Inductance that can be directly applied to inside equipment Device.

Utility model content

The purpose of this utility model is that: it is more troublesome to solve external connection current transformer, also must not do If necessary, the problem of current transformer is arranged then inside equipment, provides a kind of current transformer.

The technical solution adopted in the utility model is as follows:

A kind of current transformer, including current transformer, the current transformer is by protection cap, circuit box and mutual-inductance apparatus It constitutes, mutual-inductance apparatus is provided between the protection cap and circuit box, the circuit box surface offers line interface, the line It is welded with binding post one, binding post two, binding post three and binding post four below the box of road, between the binding post two and binding post three It is provided with limit fastener, four side of binding post is provided with side fixing buckle, and three side of binding post is provided with buckle one, The binding post two side faces are provided with buckle two, and the mutual-inductance apparatus is internally provided with iron core and coil.

Wherein, the binding post one, binding post two, binding post three and binding post four are separately positioned on circuit box bottom four corners Place.

Wherein, there are four the line interface is arranged altogether, and four line interfaces respectively at binding post one, binding post two, Binding post three and binding post four connect inside circuit box.

Wherein, the protection cap is internally provided with fusible link, and the binding post one and binding post two of fusible link and primary side And coil series connection.

Wherein, between the gap between the binding post one and binding post two is less than between binding post three and binding post four Gap.

In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are:

In the utility model, which is placed it in inside household electrical appliance by reducing volume, due to volume Reduce, so using multiple fixed card buckles and limit fastener to ensure that current transformer position will not be because of vibration or impact Etc. reasons cause the current transformer position fixed to change, interface has been opened up on circuit box, junction has been set It sets inside equipment, newly added fusible link at top, and fusible link is connected to a side line connecting for a long time with route At circle, avoid causing mutual inductance current variation to burn household electrical appliance since electric current is excessive in primary side route.

Detailed description of the invention

Fig. 1 is the main view of the current transformer of the utility model；

Fig. 2 is the left view of the current transformer of the utility model；

Fig. 3 is the bottom view of the current transformer of the utility model；

Fig. 4 is the schematic illustration of the mutual-inductance apparatus of the utility model；

Fig. 5 is the positional structure schematic diagram of the fusible link inside the protection cap of the utility model.

Marked in the figure: 1, current transformer；2, protection cap；3, circuit box；4, line interface；5, side fixing buckle；6, it limits Position buckle；7, one is buckled；8, two are buckled；9, mutual-inductance apparatus；10, binding post one；11, binding post two；12, binding post three；13, it connects Terminal four；14, iron core；15, coil；16, fusible link.

Specific embodiment

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this Utility model is not used to limit the utility model.

Referring to Fig.1-5, a kind of current transformer, including current transformer 1, current transformer 1 is by protection cap 2, circuit box 3 It is constituted with mutual-inductance apparatus 9, mutual-inductance apparatus 9 is provided between protection cap 2 and circuit box 3,3 surface of circuit box offers line interface 4, binding post 1, binding post 2 11, binding post 3 12 and binding post 4 13,2 11 He of binding post are welded with below circuit box 3 Limit fastener 6 is provided between binding post 3 12,4 13 side of binding post is provided with side fixing buckle 5,3 12 side of binding post It is provided with buckle 1,2 11 side of binding post is provided with buckle 28, and mutual-inductance apparatus 9 is internally provided with iron core 14 and coil 15.

Binding post 1, binding post 2 11, binding post 3 12 and binding post 4 13 are separately positioned on 3 bottom four of circuit box At angle, there are four the total settings of line interface 4, and four line interfaces 4 are respectively at binding post 1, binding post 2 11, binding post 3 12 and binding post 4 13 connected inside circuit box 3, protection cap 2 is internally provided with fusible link 16, and fusible link 16 and primary The binding post 1 and binding post 2 11 and coil 15 of side are connected, and the gap between binding post 1 and binding post 2 11 is less than Gap between binding post 3 12 and binding post 4 13.

The utility model is to improve diminutions based on original technology, in order to apply with inside household electrical appliance, and will be connect Fusible link 16 is added in connecting with coil 15 in terminal 3 12 and binding post 4 13, guarantees primary side route when there is curent change It can guarantee the safety of household electrical appliance.

Working principle: the current transformer 1 setting in use, be fixed in household electrical appliance by the current transformer first The circuit interface 4 in portion, primary side accesses external power supply, is connect respectively in binding post 3 12 and is connect by the circuit interface 4 of primary side It on terminal 4 13, and connects with coil 15 and fusible link 16, by the iron core 14 inside mutual-inductance apparatus 9 secondary side is produced at this time Raw mutual inducing current, is flowed out by binding post 1 and binding post 2 11, is transmitted on household electrical appliance, when foreign current changes When causing electric current excessive, fusible link 16 is burnt, and is avoided generating biggish mutual inducing current and is burnt out household electrical appliance.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model Protection scope within.

Claims (5)

1. a kind of current transformer, including current transformer (1), it is characterised in that: the current transformer (1) is by protection cap (2), circuit box (3) and mutual-inductance apparatus (9) are constituted, and are provided with mutual-inductance apparatus (9) between the protection cap (2) and circuit box (3), Circuit box (3) surface offers line interface (4), is welded with binding post one (10), binding post below the circuit box (3) Two (11), binding post three (12) and binding post four (13) are arranged limited between the binding post two (11) and binding post three (12) Position buckle (6), binding post four (13) side are provided with side fixing buckle (5), and binding post three (12) side is provided with One (7) are buckled, binding post two (11) side is provided with buckle two (8), and the mutual-inductance apparatus (9) is internally provided with iron core (14) and coil (15).

2. a kind of current transformer as described in claim 1, it is characterised in that: the binding post one (10), binding post two (11), binding post three (12) and binding post four (13) are separately positioned at circuit box (3) bottom four corners.

3. a kind of current transformer as described in claim 1, it is characterised in that: there are four the line interface (4) is arranged altogether, And four line interfaces (4) exist respectively at binding post one (10), binding post two (11), binding post three (12) and binding post four (13) Connection inside circuit box (3).

4. a kind of current transformer as described in claim 1, it is characterised in that: the protection cap (2) is internally provided with fusing Silk (16), and fusible link (16) is connected with the binding post one (10) of primary side and binding post two (11) and coil (15).

5. a kind of current transformer as described in claim 1, it is characterised in that: the binding post one (10) and binding post two (11) gap between is less than the gap between binding post three (12) and binding post four (13).