CN101777465A - Over-current protector of voltage transformer - Google Patents
Over-current protector of voltage transformer Download PDFInfo
- Publication number
- CN101777465A CN101777465A CN200910116066A CN200910116066A CN101777465A CN 101777465 A CN101777465 A CN 101777465A CN 200910116066 A CN200910116066 A CN 200910116066A CN 200910116066 A CN200910116066 A CN 200910116066A CN 101777465 A CN101777465 A CN 101777465A
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- Prior art keywords
- voltage transformer
- protection switch
- ptk
- primary side
- current
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Abstract
The invention discloses an over-current protector of a voltage transformer, comprising a protection switch (PTK). A contact of the protection switch (PTK) is a normally closed contact (ZJ); an operating coil (XQ) of the protection switch (PTK) is connected with the normally closed contact (ZJ) in series and connected in series between a ground and a neutral point at the primary side of the voltage transformer (TV) to prevent impact of fault point grounding current on the primary side of the voltage transformer (TV); and the protection switch (PTK) is a relay, a contactor or a circuit breaker. The over-current protector can avoid the impact of the fault point grounding current and completely prevent the impact of fault point grounding current at the primary side of the voltage transformer and the damage of the voltage transformer or the fusing of a high-voltage fuse at the primary side of the voltage transformer, and has the advantages of simple structure and convenient installation and use.
Description
Technical field
The present invention 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.
Summary of the invention
The technical problem to be solved in the present invention 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 invention; 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 invention.
Description of drawings
Below in conjunction with accompanying drawing optimal way of the present invention is described in further detail.
Fig. 1 is the enforcement schematic diagram of a kind of basic structure of the present invention.
Embodiment
Referring to Fig. 1, the primary side of voltage transformer TV is serially connected with the present invention 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 present invention 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 invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (2)
1. 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 |
|---|---|---|---|
| CN200910116066A CN101777465A (en) | 2009-01-13 | 2009-01-13 | Over-current protector of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910116066A CN101777465A (en) | 2009-01-13 | 2009-01-13 | Over-current protector of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101777465A true CN101777465A (en) | 2010-07-14 |
Family
ID=42513873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910116066A Pending CN101777465A (en) | 2009-01-13 | 2009-01-13 | Over-current protector of voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101777465A (en) |
-
2009
- 2009-01-13 CN CN200910116066A patent/CN101777465A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100714 |