CN201213223Y - Overcurrent protector for voltage mutual inductor - Google Patents
Overcurrent protector for voltage mutual inductor Download PDFInfo
- Publication number
- CN201213223Y CN201213223Y CNU2008200407751U CN200820040775U CN201213223Y CN 201213223 Y CN201213223 Y CN 201213223Y CN U2008200407751 U CNU2008200407751 U CN U2008200407751U CN 200820040775 U CN200820040775 U CN 200820040775U CN 201213223 Y CN201213223 Y CN 201213223Y
- Authority
- CN
- China
- Prior art keywords
- protection switch
- ptk
- primary side
- voltage transformer
- normally closed
- 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 - Fee Related
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Abstract
The utility model discloses an overcurrent protector of a voltage transformator. The overcurrent protector comprises a protection switch (PTK); the contact of the protection switch (PTK) is a normally closed contact (ZJ); an actuating coil (XQ) of the protection switch (PTK) is connected with the normally closed contact (ZJ) in series and is used for being connected in series between a nonslip point at the primary side of the voltage transformator (TV) and the ground so as to prevent the grounding current at a fault point from impacting the primary side of the voltage transformator (TV); and the protection switch (PTK) is a relay, or a contactor or a breaker. The utility model can prevent the impact of the grounding current at the fault point, completely stops the grounding current at the fault point from impacting the primary side of the voltage transformator, prevents the voltage transformator from being damaged or a high voltage fuse protector at the primary side of the voltage transformator from being fused, and has the advantages of simple structure and very convenient installation and use.
Description
Technical field
The utility model relates to a kind of overcurrent protector, especially a kind of over-current protector of voltage transformer.
Background technology
Based on economic reasons, what the 3～35kV system in China's three-phase power electrical network adopted is the three-wire system of isolated neutral.Though State Grid operating standard regulation, this system in the process of operation, when single-phase arc grounding fault takes place, still allow system's continuous service two hours; , the superpotential amplitude that single-phase arc grounding fault causes can be up to 3.15 times of normal operation phase voltage peak value, very easily cause the damage of insulation in the electric equipment and outer weak spot to puncture over the ground and cause other accident.At present, the superpotential harm that people cause for fear of single-phase arc grounding fault, the measure of reply have two kinds, and the one, at one's discretion single-phase arc grounding fault is run its course, and the 2nd, between the neutral point of transformer and ground, arc suppression coil is installed; Make the electric current cutout of line fault point or reduce, extinguish fully with electric arc with the fault point.But, no matter adopt which kind of measure, all exist following defective: promptly recover just often when the fault point, the earth current of fault point can be by a winding earth of the voltage transformer installed in the system, make the electric current that flows through in winding of voltage transformer surpass the normal running current that voltage transformer allows widely, directly cause the damage of voltage transformer or the fusing of voltage transformer primary side high-tension fuse.
The utility model content
The technical problems to be solved in the utility model provides over-current protector of voltage transformer a kind of simple in structure, easy to use for overcoming weak point of the prior art.
For solving technical problem of the present utility model; the technical scheme that is adopted is: over-current protector of voltage transformer is made of protection switch; the contact of described protection switch is a normally closed interlock; the actuating coil of described protection switch is connected in series mutually with described normally closed interlock; be used to be serially connected with between the neutral point and ground of voltage transformer primary side, to prevent of the impact of fault point earth current to the voltage transformer primary side.
As the further improvement of over-current protector of voltage transformer, described protection switch is a relay, or contactor, or circuit breaker.
Beneficial effect with respect to prior art is; one; the structure of protector the adopts contact protection switch that to be normally closed interlock, actuating coil be connected in series mutually with normally closed interlock; in use it is serially connected with between the neutral point and ground of voltage transformer primary side; it recovers just often automatically in the fault point; be that Single Phase Metal ground connection disconnects and single-phase arc grounding disconnects voluntarily or cease when disconnecting behind the arc because of the effect of arc suppression coil; can be automatically the normally closed interlock of protection switch be disconnected a period of time, to avoid the impact of fault point earth current.This is because in the process of the protection switch of flowing through much larger than the fault point earth current of the normal running current of voltage transformer; when it reaches the operating value of the actuating coil that is connected in series mutually with normally closed interlock; this actuating coil will make normally closed interlock disconnect; and the disconnection of normally closed interlock makes actuating coil quit work because of dead electricity; disconnect the closed again period at normally closed interlock, the fault point earth current is located to have dissipated by it.Thereby avoided the impact of fault point earth current, stopped of the impact of fault point earth current fully, prevented the damage of voltage transformer or the fusing of voltage transformer primary side high-tension fuse the voltage transformer primary side; Its two, protector simple in structure, it is very convenient to install and use.
Further embodiment as beneficial effect; protection switch is preferably relay or contactor or circuit breaker; not only all can guarantee the safety of voltage transformer and its primary side high-tension fuse, make that also the selectable leeway of protection switch is bigger, be easy to enforcement of the present utility model.
Description of drawings
Below in conjunction with accompanying drawing optimal way of the present utility model is described in further detail.
Fig. 1 is the enforcement schematic diagram of a kind of basic structure of the present utility model.
Embodiment
Referring to Fig. 1, the primary side of voltage transformer TV is serially connected with the utility model between the neutral point of its primary side and the ground, i.e. protection switch PTK through fuse RD each bus A, B, C electrical connection mutually with the three-phase power electrical network.The contact of protection switch PTK is normally closed interlock ZJ, and its actuating coil XQ is connected in series mutually with above-mentioned normally closed interlock ZJ; Wherein, protection switch PTK selects relay for use.
During use, recover normal moment in the fault point, the utility model can will it connect the state that keeps between the primary side of voltage transformer TV and the ground disconnecting subsequently reliably, the safe operation of having guaranteed voltage transformer TV with can not fuse with fuse RD that it is connected in series mutually.
Obviously, those skilled in the art can carry out various changes and modification to over-current protector of voltage transformer of the present utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (2)
1, a kind of over-current protector of voltage transformer; it is characterized in that: described protector is made of protection switch (PTK); the contact of described protection switch (PTK) is normally closed interlock (ZJ); the actuating coil (XQ) of described protection switch (PTK) is connected in series mutually with described normally closed interlock (ZJ); be used to be serially connected with between the neutral point and ground of voltage transformer (TV) primary side, to prevent of the impact of fault point earth current to voltage transformer (TV) primary side.
2, over-current protector of voltage transformer according to claim 1 is characterized in that protection switch (PTK) is a relay, or contactor, or circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200407751U CN201213223Y (en) | 2008-07-09 | 2008-07-09 | Overcurrent protector for voltage mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200407751U CN201213223Y (en) | 2008-07-09 | 2008-07-09 | Overcurrent protector for voltage mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201213223Y true CN201213223Y (en) | 2009-03-25 |
Family
ID=40497401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200407751U Expired - Fee Related CN201213223Y (en) | 2008-07-09 | 2008-07-09 | Overcurrent protector for voltage mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201213223Y (en) |
-
2008
- 2008-07-09 CN CNU2008200407751U patent/CN201213223Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ANHUI ONESKY ELECTRIC TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: RUI JUN Effective date: 20110317 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 230031 NO. 88, DAOXIANG ROAD, SHUSHAN NEW INDUSTRIAL PARK, HEFEI CITY, ANHUI PROVINCE TO: 230031 NO. 99, YONGHE ROAD, NEW AND HIGH TECHNOLOGY DEVELOPMENT AREA, HEFEI CITY, ANHUI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20110317 Address after: Yonghe Road, high tech Development Zone, Hefei city of Anhui Province, No. 99 230031 Patentee after: Anhui Yitian Electrical Technology Co., Ltd. Address before: Daoxiang road Hefei City, Anhui province 230031 Shushan New Industrial Park No. 88 Patentee before: Rui Jun |
|
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Anhui Golden Power Technology Co., Ltd. Assignor: Anhui Yitian Electrical Technology Co., Ltd. Contract record no.: 2011340000440 Denomination of utility model: Over-current protector of voltage transformer Granted publication date: 20090325 License type: Exclusive License Record date: 20111201 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090325 Termination date: 20140709 |
|
| EXPY | Termination of patent right or utility model |