CN202059142U - Three-phase electric power electrical network electromagnetic voltage transformer harmonic eliminating protector - Google Patents
Three-phase electric power electrical network electromagnetic voltage transformer harmonic eliminating protector Download PDFInfo
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- CN202059142U CN202059142U CN2011201245489U CN201120124548U CN202059142U CN 202059142 U CN202059142 U CN 202059142U CN 2011201245489 U CN2011201245489 U CN 2011201245489U CN 201120124548 U CN201120124548 U CN 201120124548U CN 202059142 U CN202059142 U CN 202059142U
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Abstract
The present utility model discloses a three-phase electric power electrical network electromagnetic voltage transformer harmonic eliminating protector. The protector comprises a resistor, the resistor is connected with a self-recovery fuse (PPTC) in parallel to form the harmonic eliminating protector (PTK), and the harmonic eliminating protector (PTK) is connected in series between the neutral point of the primary side of a three-phase electromagnetic voltage transformer (PT) and the earth, thereby preventing ferroresonance overvoltage. The self-recovery fuse (PPTC) is the REG series product of American Reychem Company, and the resistor is a linear resistor (R) or a non-linear resistor (FR). By adopting the protector, the ferroresonance caused by using the electromagnetic voltage transformer in the electric power system can be eliminated effectively, various equipments in the system will not be harmed by the generated overvoltage, and the normal operation of other protection devices in the electric power system will not be influenced. Moreover, the protector is simple in structure and convenient for using, is low in manufacturing and using costs, and can be widely used in the electric power system of the 3-35kV three-phase electric power electrical network, which is provided with the electromagnetic voltage transformer.
Description
Technical field
The utility model relates to a kind of voltage transformer harmonic elimination protector, especially a kind of three-phase power supply network electromagnetic voltage transformer harmonic elimination protector.
Background technology
In China, based on economic reasons, what the 3～35kV system in the three-phase power electrical network adopted is the three-wire system of isolated neutral at present.In order to monitor the insulation status of this system, people all are connected with threephase potential transformer on power plant, transformer station, generator bus.During connection, the primary side of threephase potential transformer (high pressure) winding is connected to star, the neutral-point solid ground of star.For the consideration of cost, threephase potential transformer is all selected electromagnetic potential transformer basically for use.The electric power system of this use three-phase electricity magnetic-type voltage transformer exists the factor that some are changing over the ground during its operation of power networks: the one, and the direct-to-ground capacitance of power equipment and lead (bus), the 2nd, the magnetizing inductance of voltage transformer.When system normally moved, the excitation impedance of voltage transformer was very big, so the power system network earth impedance still presents capacitive; When three-phase was in a basic balance, the displacement voltage of neutral point of electric network was very little.But when system carried out some operation, as isolated neutral system non-Switching Synchronization, earth fault disappearance etc., the excitatory impedance of voltage transformer formed nonlinear resonance with the direct-to-ground capacitance of system, causes ferro resonance; Thereby produce the overcurrent of system's overvoltage and voltage transformer, make the weak insulator arrangement in the system that the high-voltage wire iron-melting fusing of flashover, voltage transformer over the ground take place, even burn voltage transformer.This overvoltage that produces because of the ferro resonance of voltage transformer, be occur in the distribution network the most frequent, maximum a kind of Past Voltage within Power System causes the accident.
In order to eliminate the electric power system ferro-resonance over-voltage, people have done some trials and effort, and as being connected in series the resistance that is referred to as a resonance eliminator between the primary side neutral point of three-phase electricity magnetic-type voltage transformer and the ground, this resistance can be linear resistance or nonlinear resistance.With when system's generation ferro resonance, utilize linear resistance or the nonlinear resistance damping action in network, the excitation impedance that makes voltage transformer is the zero sequence loop of participation system not, thereby solves the ferro resonance of voltage transformer, avoids superpotential generation.But, though this three-phase electricity magnetic-type voltage transformer that has a resonance eliminator can be eliminated the ferro resonance problem of system, exist weak point also, at first, because of the existence of resistance, make the not direct ground connection of neutral point of voltage transformer primary side, when system normally moves, this resistance causes the neutral point imbalance of voltage transformer, makes voltage transformer open delta winding produce residual voltage, thereby influences the operate as normal of the protective relaying device in the system; Secondly, when system's generation single phase ground fault, so the existence of resistance, will cause the neutrality of voltage transformer to press skew, the residual voltage of voltage transformer open delta winding induction is reduced, thereby influence the operate as normal of protective relaying device.In a word, it has also brought destabilizing factor to electric power system simultaneously, has brought hidden danger for the safe operation of electric power system.
The utility model content
The technical problems to be solved in the utility model provides three-phase power supply network electromagnetic voltage transformer harmonic elimination protector 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: three-phase power supply network electromagnetic voltage transformer harmonic elimination protector comprises resistance, particularly,
Described resistance and resettable fuse are connected in parallel and constitute the harmonic elimination protector, are used to be serially connected with between the neutral point and ground of three-phase electricity magnetic-type voltage transformer primary side, to prevent to cause ferro-resonance over-voltage.
As the further improvement of three-phase power supply network electromagnetic voltage transformer harmonic elimination protector, described resettable fuse is the REG-series of products of U.S. reychem (auspicious chatting about) company; Described resistance is linear resistance or nonlinear resistance.
Beneficial effect with respect to prior art is, the performance that has based on the resettable fuse of being made by polymer resin and conductive nano crystal grain: under the normal condition, the conductive nano crystal forms chain conductive path, fuse operate as normal with the resin-based link; When circuit is short-circuited or transships; the big electric current of fuse of flowing through makes its collection temperature rise; when reaching Curie temperature; its density of states reduces rapidly, and phase transformation increases, and inner electrically conductive links is variation of snowslide attitude or fracture; fuse is phase step type and transits to high-impedance state; electric current is by rapid pinch off, thereby circuit is carried out fast, limits accurately and protects; its small electric current makes fuse be in guard mode always; after down circuitry or fault eliminating, its collection temperature drop is low, and the density of states increases; phase transformation is restored; nanocrystal is reduced into the chain conductive path, and resettable fuse reverts to normal condition, need not artificial replacing.The be connected in parallel structure of resettable fuse of the two ends that the utility model is used in resistance; and it is serially connected with between the neutral point and ground of three-phase electricity magnetic-type voltage transformer primary side; its just can: when system normally moves; the voltage transformer neutral point is through harmonic elimination protector ground connection; because the resistance of the resettable fuse in the harmonic elimination protector is very little; thereby avoided the generation of voltage transformer open delta winding residual voltage; guaranteed the normal operation of system, also can not influence simultaneously in the electric power system protective device the judgement of system's metal earth fault.Behind system's generation resonance, voltage transformer is saturated, and impedance diminishes; thereby cause the electric current that flows through voltage transformer excessive; when electric current surpasses the operating current of resettable fuse in the harmonic elimination protector, the resettable fuse quick fuse, thus overcurrent is shifted to resistance.The excitation impedance that the damping action of resistance makes voltage transformer is the zero sequence loop of participation system not, and then has eliminated the ferro resonance of system, has avoided the generation of ferro-resonance over-voltage.After system resonance was eliminated, the electric current that flows through the harmonic elimination protector diminished, and it is normal that resettable fuse recovers voluntarily.In sum; the utility model can be eliminated the ferro resonance because of using electromagnetic potential transformer to cause in the electric power system effectively; and then the various device in the overvoltage injury system that avoids producing; can not influence the normal operation of other protective device in the electric power system again, also have advantage simple in structure, easy to use, that manufacturing cost and use cost is cheap.
Further embodiment as beneficial effect, the one, resettable fuse is preferably the REG-series of products of U.S. reychem (auspicious chatting about) company, not only be suitable for the electromagnetic potential transformer adapted of various electric pressures, the characteristics of constant product quality, reliable operation are also arranged; The 2nd, resistance is preferably linear resistance or nonlinear resistance, under the bigger situation in choice, all can make the utility model realize its function.
Description of drawings
Below in conjunction with accompanying drawing optimal way of the present utility model is described in further detail.
Fig. 1 is a kind of basic structure schematic diagram of the present utility model, and the resistance among the figure is linear resistance R;
Fig. 2 is an another kind of basic structure schematic diagram of the present utility model, and the resistance among the figure is non-linear resistance FR.
Embodiment
Referring to Fig. 1 and Fig. 2, the primary side of three-phase electricity magnetic-type voltage transformer pt is serially connected with harmonic elimination protector PTK through fuse RD each bus A, B, C electrical connection mutually with the three-phase power electrical network between the neutral point of its primary side and ground.Harmonic elimination protector PTK is in parallel by resistance and resettable fuse PPTC and connects and composes; wherein; resistance is linear resistance R (see Fig. 1, as select for use nonlinear resistance FR then to see Fig. 2), and resettable fuse PPTC selects the REG-series of products of U.S. reychem (auspicious chatting about) company for use.
During use; no matter electric power system is normal operation; still carry out some operation or single phase ground fault takes place; because existence of the present utility model; can guarantee that all electric power system can not cause ferro-resonance over-voltage because of using three-phase electricity magnetic-type voltage transformer pt, more can not influence the normal operation of other protective device in the electric power system.
Obviously, those skilled in the art can carry out various changes and modification to three-phase power supply network electromagnetic voltage transformer harmonic elimination protector 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 (3)
1. a three-phase power supply network electromagnetic voltage transformer harmonic elimination protector comprises resistance, it is characterized in that:
Described resistance and resettable fuse (PPTC) are connected in parallel and constitute harmonic elimination protector (PTK), are used to be serially connected with between the neutral point and ground of three-phase electricity magnetic-type voltage transformer (PT) primary side, to prevent to cause ferro-resonance over-voltage.
2. three-phase power supply network electromagnetic voltage transformer harmonic elimination protector according to claim 1 is characterized in that resettable fuse (PPTC) is the REG-series of products of U.S. reychem company.
3. three-phase power supply network electromagnetic voltage transformer harmonic elimination protector according to claim 1 is characterized in that resistance is linear resistance (R), or nonlinear resistance (FR).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201245489U CN202059142U (en) | 2011-04-22 | 2011-04-22 | Three-phase electric power electrical network electromagnetic voltage transformer harmonic eliminating protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201245489U CN202059142U (en) | 2011-04-22 | 2011-04-22 | Three-phase electric power electrical network electromagnetic voltage transformer harmonic eliminating protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202059142U true CN202059142U (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201245489U Expired - Fee Related CN202059142U (en) | 2011-04-22 | 2011-04-22 | Three-phase electric power electrical network electromagnetic voltage transformer harmonic eliminating protector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110829373A (en) * | 2019-11-14 | 2020-02-21 | 国网山东省电力公司潍坊市寒亭区供电公司 | Anti-excitation current electromagnetic voltage transformer |
| CN117728369A (en) * | 2024-02-18 | 2024-03-19 | 国网安徽省电力有限公司电力科学研究院 | Electromagnetic voltage transformer overvoltage suppression assembly based on PTC |
| CN117728369B (en) * | 2024-02-18 | 2024-05-10 | 国网安徽省电力有限公司电力科学研究院 | Electromagnetic voltage transformer overvoltage suppression assembly based on PTC |
-
2011
- 2011-04-22 CN CN2011201245489U patent/CN202059142U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110829373A (en) * | 2019-11-14 | 2020-02-21 | 国网山东省电力公司潍坊市寒亭区供电公司 | Anti-excitation current electromagnetic voltage transformer |
| CN117728369A (en) * | 2024-02-18 | 2024-03-19 | 国网安徽省电力有限公司电力科学研究院 | Electromagnetic voltage transformer overvoltage suppression assembly based on PTC |
| CN117728369B (en) * | 2024-02-18 | 2024-05-10 | 国网安徽省电力有限公司电力科学研究院 | Electromagnetic voltage transformer overvoltage suppression assembly based on PTC |
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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: 20120607 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 230031 HEFEI, ANHUI PROVINCE TO: 230088 HEFEI, ANHUI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120607 Address after: 230088 No. 99 Yonghe Road, hi tech Development Zone, Anhui, Hefei Patentee after: Anhui Yitian Electrical Technology Co., Ltd. Address before: Yonghe Road, high tech Development Zone, Hefei city of Anhui Province, No. 99 230031 Patentee before: Rui Jun |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20160422 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |