CN202363880U - Transformer protective circuit - Google Patents
Transformer protective circuit Download PDFInfo
- Publication number
- CN202363880U CN202363880U CN2011204748780U CN201120474878U CN202363880U CN 202363880 U CN202363880 U CN 202363880U CN 2011204748780 U CN2011204748780 U CN 2011204748780U CN 201120474878 U CN201120474878 U CN 201120474878U CN 202363880 U CN202363880 U CN 202363880U
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- Prior art keywords
- fuse
- transformer
- winding
- resistance
- piezo
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Abstract
The utility model relates to a protective circuit, particularly to a transformer protective circuit. The transformer protective circuit comprises a first winding (1) of the transformer, and a fuse (2), wherein one end of the first winding (1) is connected with one end of the fuse (2); the other end of the first winding (1) is connected with a zero line; and the other end of the fuse (2) is connected with a live wire. The transformer protective circuit is characterized by further comprising a piezoresistor (3), wherein one end of the piezoresistor (3) is connected with the other end of the fuse (2) while the other end of the piezoresistor (3) is connected with the other end of the first winding (1). The protective circuit of the utility model is provided with both an over-current protection function and an overvoltage protection function.
Description
Technical field
The utility model relates to a kind of protective circuit, relates in particular to a kind of transformer electric protection circuit.
Background technology
Transformer in the electric energy meter is to link to each other with the zero line live wire of external electrical network; The tranformer protection circuit of the prior art fuse of just between transformer and external electrical network, connect, and fuse only plays overcurrent protection is so perhaps receive ectocine when voltage ripple of power network; Such as lightning, power supply access suddenly etc.; Can cause that voltage instantaneous increases sharply, and fuse can't break off and playing a protective role this moment, can cause the transformer internal circuit to damage because of voltage jump.
Summary of the invention
The utility model technical problem to be solved is: a kind of tranformer protection circuit that overcurrent protection also has over-voltage protecting function that promptly has is provided.
The technical scheme that the utility model adopted is: a kind of tranformer protection circuit; Comprise transformer first winding and fuse, an end of said transformer first winding connects an end of fuse, and the other end of said transformer first winding connects zero line; The other end of said fuse connects live wire; It also comprises a piezo-resistance, and an end of described piezo-resistance connects the other end of fuse, and the other end of said piezo-resistance connects the other end of transformer first winding.
As preferably, described piezo-resistance model is MYN23.
Adopt above structure compared with prior art; The utlity model has following advantage, a parallelly connected piezo-resistance on fuse and transformer first winding makes that like this circuit has over-voltage protecting function; Promptly the piezo-resistance resistance can be very little when voltage ripple of power network; Make loop current excessive, the transformer internal circuit has been protected in the fuse automatic disconnection.
As preferably, described fuse is that model is the resettable fuse of RF60-375.Adopt resettable fuse, so just can use this fuse repeatedly and need not change it, made things convenient for people and practiced thrift cost.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model tranformer protection circuit.
As shown in the figure: 1, transformer first winding; 2, fuse; 3, piezo-resistance.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done to further describe, but the utility model is not limited only to following embodiment.
Shown in accompanying drawing, a kind of tranformer protection circuit comprises transformer first winding 1 and fuse 2; One end of said transformer first winding 1 connects an end of fuse 2; The other end of said transformer first winding 1 connects zero line, and the other end of said fuse 2 connects live wire, and it also comprises a piezo-resistance 3; One end of described piezo-resistance 3 connects the other end of fuse 2, and the other end of said piezo-resistance 3 connects the other end of transformer first winding 1.Described piezo-resistance 3 models are MYN23.
The operation principle of said piezo-resistance 3 is: when line voltage is that the alternating current voltage fluctuation perhaps receives ectocine (like lightning, the unexpected access of power supply etc.) and causes the voltage instantaneous surge; It is very little that the resistance of piezo-resistance can become; So cause the electric current in the loop that piezo-resistance, fuse and transformer first winding form very big; The effect of protection transformer internal circuit has so just been played in fuse automatic disconnection because of overcurrent.
Described fuse 2 is that model is the resettable fuse of RF60-375.
The operation principle of resettable fuse is: it is to be processed into through special process by high-tech polymer resin and conductive nano crystal grain, and under the normal condition, the conductive nano crystal forms chain conductive path, fuse operate as normal with the resin-based link; When circuit was short-circuited or transships, the big electric current of the fuse of flowing through made its collection temperature rise, and when reaching Curie temperature, its density of states reduces rapidly; Phase transformation increases, and inner electrically conductive links is change of snowslide attitude or fracture, and fuse is phase step type and adjourns high-impedance state, and the electric current quilt is pinch off rapidly; Thereby circuit is carried out fast, limit accurately and protect, its small electric current makes fuse be in guard mode always, after outage and fault eliminating; Its collection temperature drop is low, and the density of states increases, and phase transformation is restored; Nanocrystal is reduced into the chain conductive path, and resettable fuse reverts to normal condition, need not artificial the replacing.
Claims (3)
1. tranformer protection circuit; Comprise transformer first winding (1) and fuse (2); One end of said transformer first winding (1) connects an end of fuse (2); The other end of said transformer first winding (1) connects zero line, and the other end of said fuse (2) connects live wire, and it is characterized in that: it also comprises a piezo-resistance (3); One end of described piezo-resistance (3) connects the other end of fuse (2), and the other end of said piezo-resistance (3) connects the other end of transformer first winding (1).
2. tranformer protection circuit according to claim 1 is characterized in that: described piezo-resistance (3) model is MYN23.
3. tranformer protection circuit according to claim 1 is characterized in that: described fuse (2) is that model is the resettable fuse of RF60-375.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204748780U CN202363880U (en) | 2011-11-25 | 2011-11-25 | Transformer protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204748780U CN202363880U (en) | 2011-11-25 | 2011-11-25 | Transformer protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202363880U true CN202363880U (en) | 2012-08-01 |
Family
ID=46575036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204748780U Expired - Lifetime CN202363880U (en) | 2011-11-25 | 2011-11-25 | Transformer protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202363880U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904611A (en) * | 2012-12-26 | 2014-07-02 | 苏州工业园区新宏博通讯科技有限公司 | Multi-channel watt-hour meter and overcurrent protection circuit thereof |
| CN106024342A (en) * | 2016-07-06 | 2016-10-12 | 江苏科兴电器有限公司 | 3-35kV self-recovery and short circuit preventing voltage transformer |
-
2011
- 2011-11-25 CN CN2011204748780U patent/CN202363880U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904611A (en) * | 2012-12-26 | 2014-07-02 | 苏州工业园区新宏博通讯科技有限公司 | Multi-channel watt-hour meter and overcurrent protection circuit thereof |
| CN106024342A (en) * | 2016-07-06 | 2016-10-12 | 江苏科兴电器有限公司 | 3-35kV self-recovery and short circuit preventing voltage transformer |
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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 | ||
| CP03 | Change of name, title or address |
Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo Patentee after: NINGBO SANXING MEDICAL ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo Sanxing Electric Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20120801 |
|
| CX01 | Expiry of patent term |