CN2494552Y - Current transformer - Google Patents
Current transformer Download PDFInfo
- Publication number
- CN2494552Y CN2494552Y CN 01245588 CN01245588U CN2494552Y CN 2494552 Y CN2494552 Y CN 2494552Y CN 01245588 CN01245588 CN 01245588 CN 01245588 U CN01245588 U CN 01245588U CN 2494552 Y CN2494552 Y CN 2494552Y
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- CN
- China
- Prior art keywords
- current
- automatic switch
- intelligent automatic
- resistor
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
A current transformer is a part which is assembled on the copper nut row which is arranged in an intelligent automatic switch, acquires the energy when the current travels in the copper nut row and supplies the electricity to other circuits in the intelligent automatic switch. The current transformer consists of a shell, a ring-shaped iron core which is arranged in the shell, a mutual inductance coil which is sleeved and arranged on the ring-shaped iron core through a spool and a current limiting part; the current limiting part is a resistor and one end of the resistor is connected with one end of the mutual inductance coil; the other end of the resistor is connected with one input terminal of a control circuit of the intelligent automatic switch and the other end of the mutual inductance coil is connected with the other input terminal of the control circuit of the intelligent automatic switch. The utility model has the advantages that the utility model has small energy consumption, has simple structure, can be conveniently arranged, and has weak short current, can effectively control the electricity supply stability of the circuit and prevent the coil from emitting heat.
Description
The utility model relates to a kind of current transformer, particularly is assemblied on the copper bus-bar in the intelligent automatic switch, obtains energy when copper bus-bar flows through electric current, as the parts of other circuit supply in the intelligent automatic switch.
Common current transformer, it is to utilize input winding and the current ratio of output between winding on the iron core to be made with the principle of the inversely proportional relation of turn ratio, mainly is the electromagnetic device as the measurement electric current.The defective of its existence is: when current transformer can generate heat at big electric current coil of following time, influence the power supply stability of circuit, and because the difference of purposes, thereby make the common current instrument transformer be not suitable for being applied on the intelligent automatic switch.The Chinese patent patent No. is 99203287.3, a kind of " quick-magnetic saturated current transformer " that can be applied on the intelligent automatic switch disclosed, it is at magnetic shunt piece that changes with the permeability magnetic material thin slice of the other insertion of the output winding wire bag of annular core, the magnetic shunt piece is as the current-limiting components of circuit, effectively stop the increase of output current by its branch magnetic action, solved the power supply stability of intelligent automatic switch under big electric current and the difficult problem of heating.But also there is following defective: at first, when little electric current, because the magnetic shunt piece that installs additional always has certain branch magnetic action to magnetic field, thereby reduced the energy that current transformer offers other circuit; Secondly, because that the gap between magnetic shunt piece and the annular core requires is comparatively strict, therefore there is certain degree of difficulty installing; Once more, the electric current I 〉=1.2I that in copper bus-bar, flows through
nWhen (rated current), the short circuit current that installs the magnetic shunt piece additional is also enough not little.
The purpose of this utility model is will provide that a kind of energy consumption is little, simple in structure, easy for installation, short circuit current is little, can effectively draw the power supply stability of circuit and prevent the current transformer of coil heating.
The purpose of this utility model is achieved like this, a kind of current transformer, it by housing 6, be located at annular core 1 in the housing 6, the mutual inductor 3, the current-limiting components that are placed on the annular core 1 by bobbin 2 form, described current-limiting components is a resistor 4, one end of resistor 4 is connected with an end of mutual inductor 3, the other end of resistor 4 is connected with an input of the control circuit of intelligent automatic switch 9, and the other end of mutual inductor 3 is connected with another input of the control circuit of intelligent automatic switch 9.
Below in conjunction with accompanying drawing the utility model is further described below.
Fig. 1 is a structure diagram of the present utility model.
Fig. 2 is an equivalent circuit diagram of the present utility model.
The housing of the present utility model 6 general plastic mouldings that adopt form, and the bottom of housing 6 has a base 7, and the centre of base 7 is through holes, is copper bus-bar jack 8, the copper bus-bar of the intelligent automatic switch that is used to plant.Be equipped with an annular core 1 on base 7, annular core 1 is reeled by the sheet ferromagnetic material and is formed, and its cross section is less, and through special thermal treatment, makes its saturation point reach, to guarantee that control circuit 9 enters normal operating conditions in advance.Penetrating a mutual inductor 3 that is around in enamelled wire on the bobbin 2 on the annular core 1, one end of mutual inductor 3 is connected with an end of resistor 4, the other end of resistor 4 is connected to an input of the control circuit 9 of intelligent automatic switch, and the other end of mutual inductor 3 is connected with another input of control circuit 9., can be connected in the coupling 5 (as shown in Figure 1) simultaneously, again being connected by coupling 5 realizations and control circuit 9 with being connected to two outputs that draw circuit for the ease of operation.The above-mentioned current transformer that assembles again with resin or silicon rubber embedding, only makes coupling 5 be exposed to outside the housing 6 in the upper end of housing 6.
The utility model only needs current transformer is inserted on the copper bus-bar of intelligent switch by the copper bus-bar jack 8 on its base 7 when mounted, and coupling 5 is connected with the control circuit 9 of intelligent switch gets final product, and installs very convenient.Here copper bus-bar does not structurally connect together with instrument transformer as the primary winding of current transformer, belongs to the part of intelligent switch.
Be illustrated in figure 2 as the equivalent circuit diagram of current transformer, wherein E represents the induced electromotive force of generation on the mutual inductor 3, X
LThe induction reactance of expression mutual inductor 3, r represents the D.C. resistance of mutual inductor 3, and R represents the resistance of resistor 4, and in the ordinary course of things, the resistance of resistor 4 may be selected to be: R≤0.5r.The impedance of instrument transformer is: Z=X
L+ (r+R); Induced electromotive force E=4.44fBSN (f represents power frequency 50HZ, and B represents magnetic flux density, and S represents the sectional area of annular core 1, and N represents the wire circle of mutual inductor 3); Short circuit current i=E/Z.In when work, the power current value I that in copper bus-bar, flows through hour, the permeability on the annular core 1 is higher, at this moment the induction reactance X of mutual inductor 3
L＞＞R, then impedance Z is with X
LBe main, R can ignore, thereby has guaranteed that instrument transformer has enough energy output; And when the power current I that flows through in the copper bus-bar reached certain value, the magnetic induction density B of annular core 1 was in saturation condition, and this moment, the permeability of annular core 1 just reduced along with the increase of power current value I, caused induction reactance X
LReduce, make (R+r)) X
L, then impedance Z is based on (R+r), and short circuit current i=E/Z, the denominator value because numerator value is constant has diminished i numerical value, thereby has played metering function effectively owing to increased R.
The utility model is owing to after will installing the shunt magnetic piece additional and changing series resistor R into, make instrument transformer when little electric current, and the energy that offers control circuit is bigger, that is to say, makes control circuit shift to an earlier date reliably working; Simultaneously install quite convenient; Once more, the power current I 〉=1.2I that in copper bus-bar, flows through
nThe time, short circuit current of the present utility model is much smaller than the short circuit current that installs the shunt magnetic piece additional, thereby efficiently solve instrument transformer under big electric current to problems such as the power supply stability of intelligent automatic ON-OFF control circuit and heatings.
Claims (1)
1, a kind of current transformer, it by housing (6), be located at annular core (1) in the housing (6), the mutual inductor (3), the current-limiting components that are placed on the annular core (1) by bobbin (2) form, it is characterized in that described current-limiting components is resistor (4), one end of resistor (4) is connected with an end of mutual inductor (3), the other end of resistor (4) is connected with an input of the control circuit (9) of intelligent automatic switch, and the other end of mutual inductor (3) is connected with another input of the control circuit (9) of intelligent automatic switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01245588 CN2494552Y (en) | 2001-08-23 | 2001-08-23 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01245588 CN2494552Y (en) | 2001-08-23 | 2001-08-23 | Current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2494552Y true CN2494552Y (en) | 2002-06-05 |
Family
ID=33656816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01245588 Expired - Lifetime CN2494552Y (en) | 2001-08-23 | 2001-08-23 | Current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2494552Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360871A (en) * | 2011-08-23 | 2012-02-22 | 常熟开关制造有限公司(原常熟开关厂） | Mutual inductor packaging assembly |
| CN103376350A (en) * | 2013-07-07 | 2013-10-30 | 浙江大学 | Switch-type pulse-controlling current sensor of iron hoop coil |
| CN105575642A (en) * | 2016-02-29 | 2016-05-11 | 济南铂晶电子科技有限公司 | Three-phase integrated voltage transformer internally provided with resistors |
| CN110068722A (en) * | 2019-04-29 | 2019-07-30 | 烟台工程职业技术学院(烟台市技师学院) | A kind of dual coil current sensor |
-
2001
- 2001-08-23 CN CN 01245588 patent/CN2494552Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360871A (en) * | 2011-08-23 | 2012-02-22 | 常熟开关制造有限公司(原常熟开关厂） | Mutual inductor packaging assembly |
| CN102360871B (en) * | 2011-08-23 | 2012-11-21 | 常熟开关制造有限公司(原常熟开关厂） | Mutual inductor packaging assembly |
| CN103376350A (en) * | 2013-07-07 | 2013-10-30 | 浙江大学 | Switch-type pulse-controlling current sensor of iron hoop coil |
| CN105575642A (en) * | 2016-02-29 | 2016-05-11 | 济南铂晶电子科技有限公司 | Three-phase integrated voltage transformer internally provided with resistors |
| CN110068722A (en) * | 2019-04-29 | 2019-07-30 | 烟台工程职业技术学院(烟台市技师学院) | A kind of dual coil current sensor |
| CN110068722B (en) * | 2019-04-29 | 2021-03-23 | 烟台工程职业技术学院(烟台市技师学院) | Double-coil current sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHANGSHU SWITCH MANUFACTURING CO., LTD. ( CHANGSHU Free format text: FORMER NAME OR ADDRESS: CHANGSHU SWITCH FACTORY |
|
| CP03 | Change of name, title or address |
Address after: 215500 No. 8 Jianye Road, Jiangsu, Changshou City Patentee after: Changshu Switchgear Manufacturing Co., Ltd. (Former Changshu Switchgear Factory) Address before: 215532 No. 68 Li Gate Road, Jiangsu, Changshou City Patentee before: Changshu Switch Factory |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20110823 Granted publication date: 20020605 |