CN201213224Y - Over-current protecting equipment for voltage mutual inductor - Google Patents
Over-current protecting equipment for voltage mutual inductor Download PDFInfo
- Publication number
- CN201213224Y CN201213224Y CNU2008200407840U CN200820040784U CN201213224Y CN 201213224 Y CN201213224 Y CN 201213224Y CN U2008200407840 U CNU2008200407840 U CN U2008200407840U CN 200820040784 U CN200820040784 U CN 200820040784U CN 201213224 Y CN201213224 Y CN 201213224Y
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- voltage
- protection switch
- ptk
- primary side
- arc
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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 electrically connected with an auxiliary normally opened contact of a high voltage AC contactor of a spark absorber or the output end of a controller of the spark absorber 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 protective device, especially a kind of voltage transformer overcurrent protective device.
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; people are in order to eliminate the superpotential harm that single-phase arc grounding fault causes; arc-extinction device often is installed, as a kind of " Three-phase Electric Power Network Non-direct Ground System Arc Earthing over-Voltage Protection " that in the Chinese utility model patent specification CN 2456351Y of bulletin on October 24 calendar year 2001, discloses in system.It adopts the primary side of voltage transformer to be electrically connected with the input of controller with each bus electrical connection mutually, the secondary side of three-phase power electrical network with high voltage isolator through fuse, the output of controller is electrically connected with the actuating coil of high-voltage alternating contactor, the normally open contact of high-voltage alternating contactor is connected in series the back cross-over connection in the contact of fuse and high voltage isolator and the structure between the ground with high-voltage and current-limitation fuse, the neutral ground of voltage transformer primary side wherein, high-voltage alternating contactor are phase-splitting control and mutual locking three.When the three-phase power operation of power networks of the isolated neutral that this arc-extinction device is installed, as long as arc grounding takes place, its overvoltage will be detected by the secondary side of the controller in the arc-extinction device by voltage transformer, and judge out of order separate by it, thereby send control signal and go to drive the action of high-voltage alternating contactor, finish the closure of its corresponding normally opened contact, transfer stable direct ground state to through the respective contacts of high-voltage and current-limitation fuse and high-voltage alternating contactor with the unstable ground state of this phase that will cause by arc grounding.But, though this arc-extinction device can be eliminated the harm that arc grounding causes effectively, exist following defective also: 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 voltage transformer overcurrent protective device 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: the voltage transformer overcurrent protective device is made of protection switch; the contact of described protection switch is a normally closed interlock; the output of the auxiliary normal opened contact of the actuating coil of described protection switch and the high-voltage alternating contactor of arc-extinction device or the controller of arc-extinction device is electrically connected; 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 voltage transformer overcurrent protective device, described protection switch is a relay, or contactor, or circuit breaker.
Beneficial effect with respect to prior art is, one, it is normally closed interlock, actuating coil and the structure that is electrically connected with the output of the controller of the auxiliary normal opened contact of the high-voltage alternating contactor of arc-extinction device or arc-extinction device that protective device adopts contact, in use it is serially connected with between the neutral point and ground of voltage transformer primary side, when earth fault appears in system, the action of arc-extinction device vacuum contactor is closed, simultaneously normally closed protection switch is disconnected; When recover just often the fault point, be after single-phase arc grounding ceases arc because of arc-extinction device moves, for making system restoration normal, arc-extinction device need disconnect the normally open contact of closed high-voltage alternating contactor artificially, and arc-extinction device is with the normally closed interlock timing closing of protection switch at this moment; This is because the normally open contact of high-voltage alternating contactor in arc-extinction device is the output of the controller of extinguishing arc and closure or arc-extinction device when sending control signal, the actuating coil of the protection switch that is electrically connected with the output of the controller of the auxiliary normal opened contact of this high-voltage alternating contactor or arc-extinction device has also moved, the normally closed interlock that is about to protection switch has disconnected, disappearance along with the control signal of the output of the controller of the disconnection of the normally open contact of the high-voltage alternating contactor in the arc-extinction device or arc-extinction device, this actuating coil also quits work because of dead electricity, thereby the normally closed interlock that is in the state of cut-offfing that makes protection switch lags behind the normally open contact about 30ms of disconnection of the high-voltage alternating contactor in the arc-extinction device and returns to normal, promptly closed again, 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, protective device 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 the output of the auxiliary normal opened contact of its actuating coil XQ and the high-voltage alternating contactor of arc-extinction device or the controller of arc-extinction device is electrically connected; Wherein, protection switch PTK selects relay for use.
During use, recover normal moment in the fault point, the normally open contact that is in closure state of high-voltage alternating contactor that is arc-extinction device is when disconnecting artificially, the utility model still can will keep the off-state of a period of time between the primary side of voltage transformer TV and the ground, again it is connected reliably subsequently, 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 voltage transformer overcurrent protective device 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 voltage transformer overcurrent protective device; it is characterized in that: described protective device 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 electrically connected with the output of the controller of the auxiliary normal opened contact of the high-voltage alternating contactor of arc-extinction device or arc-extinction device; 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, voltage transformer overcurrent protective device 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 |
|---|---|---|---|
| CNU2008200407840U CN201213224Y (en) | 2008-07-09 | 2008-07-09 | Over-current protecting equipment for voltage mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200407840U CN201213224Y (en) | 2008-07-09 | 2008-07-09 | Over-current protecting equipment for voltage mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201213224Y true CN201213224Y (en) | 2009-03-25 |
Family
ID=40497402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200407840U Expired - Fee Related CN201213224Y (en) | 2008-07-09 | 2008-07-09 | Over-current protecting equipment for voltage mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201213224Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103081268A (en) * | 2010-08-20 | 2013-05-01 | 东芝三菱电机产业系统株式会社 | Grounding device |
-
2008
- 2008-07-09 CN CNU2008200407840U patent/CN201213224Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103081268A (en) * | 2010-08-20 | 2013-05-01 | 东芝三菱电机产业系统株式会社 | Grounding device |
| CN103081268B (en) * | 2010-08-20 | 2016-01-20 | 东芝三菱电机产业系统株式会社 | Earthing device |
| US9257829B2 (en) | 2010-08-20 | 2016-02-09 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Grounding apparatus |
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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 protecting equipment for voltage mutual inductor 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 |