CN201789267U - Harmonic wave elimination protector of three-phase electricity grid electromagnetic voltage transformator - Google Patents
Harmonic wave elimination protector of three-phase electricity grid electromagnetic voltage transformator Download PDFInfo
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- CN201789267U CN201789267U CN2010205052758U CN201020505275U CN201789267U CN 201789267 U CN201789267 U CN 201789267U CN 2010205052758 U CN2010205052758 U CN 2010205052758U CN 201020505275 U CN201020505275 U CN 201020505275U CN 201789267 U CN201789267 U CN 201789267U
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- harmonic wave
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- wave elimination
- elimination protector
- voltage transformer
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Abstract
The utility model relates to a harmonic wave elimination protector of a voltage transformator, and particularly discloses a harmonic wave elimination protector of a three-phase electricity grid electromagnetic voltage transformator, which comprises a capacitor. The capacitor is connected with a resettable fuse in parallel to form the harmonic wave elimination protector, and the harmonic wave elimination protector is connected between a neutral point and a ground point on the primary side of a three-phase electromagnetic voltage transformator, so as to prevent the occurrence of ferromagnetic resonance overvoltage. The harmonic wave elimination protector not only can effectively eliminate ferromagnetic resonance in an electric power system caused by the utilization of the electromagnetic voltage transformator, and further prevent the generated overvoltage from damaging various equipment in the system, but also can not influence the normal operation of other protectors in the system, and also has the advantages that the structure is simple, the harmonic wave elimination protector is convenient to use, and the manufacture cost and use cost are low; and the harmonic wave elimination protector can be widely applied to the electric power system of 3 to 35 kV three-phase electricity grid provided with the electromagnetic voltage transformator.
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, comprising: the voltage transformer that adopts low magnetic density or high permeability iron core; Between power supply neutral point and ground or in the instrument transformer open delta, seal in suitable resistance; Adjust, strengthen circuit bus ground capacitance, and between power supply neutral point and ground, insert arc suppression coil; Between winding of voltage transformer and earth point, insert harmonic elimination apparatus---suitable resistance or voltage transformer; Adopt capacitance type potential transformer or the like.Common method is to be 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 ground, and 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, existing three-phase electricity magnetic-type voltage transformer has also brought destabilizing factor to system when eliminating the electric power system ferro resonance, has buried hidden danger for the safe operation of system.
[utility model content]
Technical problem to be solved in the utility model is to overcome weak point of the prior art, and three-phase power supply network electromagnetic voltage transformer harmonic elimination protector a kind of simple in structure, easy to use is provided.
The utility model solves the problems of the technologies described above by the following technical programs: three-phase power supply network electromagnetic voltage transformer harmonic elimination protector; comprise electric capacity; described electric capacity and resettable fuse are connected in parallel and constitute the harmonic elimination protector; be used to be serially connected with between the neutral point and earth point of three-phase electricity magnetic-type voltage transformer primary side, to prevent to cause ferro-resonance over-voltage.
As the further improvement of such scheme, described electric capacity is the superhigh pressure ceramic disc capacitor.
Principle of the present utility model is: the beneficial effect with respect to prior art is, the performance that has based on the resettable fuse of making 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 electric capacity; and it is serially connected with between the neutral point and earth point of three-phase electricity magnetic-type voltage transformer primary side; it mainly acts on: 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.When induction reactance in the circuit equals capacitive reactance (XL=XC); system produces ferro resonance; voltage transformer is saturated, and impedance diminishes, thereby causes the electric current that flows through voltage transformer excessive; when electric current surpasses the operating current of resettable fuse in the harmonic elimination protector; resettable fuse quick fuse, thereby the capacitive reactance of adding electric capacity in resonant tank are with condition of resonance (XL=XC) in the destruction system; and then eliminated the ferro resonance of system, 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.
Advantage of the present utility model is: this device 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.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is circuit theory diagrams of the present utility model.
[embodiment]
Referring to Fig. 1, the primary side of three-phase electricity magnetic-type voltage transformer pt is serially connected with harmonic elimination protector PTC through fuse RD each bus A, B, C electrical connection mutually with the three-phase power electrical network between its primary side neutral point and earth point.Harmonic elimination protector PTC is in parallel by superhigh pressure ceramic disc capacitor C and resettable fuse PPTC and connects and composes; wherein; the capacitor C choice is bigger; most of electric capacity all can make the utility model realize its function; select excellent scheme to be adopted as the superhigh pressure ceramic disc capacitor; the advantage that it has high stability is suitable for utmost point long-term work under the high voltage.
Resettable fuse PPTC selects the REG-series of products of U.S. reychem (auspicious chatting about) company for use, not only is suitable for the electromagnetic potential transformer adapted of various electric pressures, and the characteristics of constant product quality, reliable operation are also arranged.
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
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.For the ordinary skill in the art, be appreciated that under the situation that does not break away from principle of the present utility model and spirit and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is limited by claims and equivalent thereof.
Claims (2)
1. three-phase power supply network electromagnetic voltage transformer harmonic elimination protector comprises electric capacity, it is characterized in that:
Described electric capacity and resettable fuse are connected in parallel and constitute the harmonic elimination protector, and described harmonic elimination protector is serially connected with between the neutral point and earth point of three-phase electricity magnetic-type voltage transformer primary side.
2. three-phase power supply network electromagnetic voltage transformer harmonic elimination protector according to claim 1 is characterized in that: described electric capacity is the superhigh pressure ceramic disc capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205052758U CN201789267U (en) | 2010-08-19 | 2010-08-19 | Harmonic wave elimination protector of three-phase electricity grid electromagnetic voltage transformator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205052758U CN201789267U (en) | 2010-08-19 | 2010-08-19 | Harmonic wave elimination protector of three-phase electricity grid electromagnetic voltage transformator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201789267U true CN201789267U (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205052758U Expired - Fee Related CN201789267U (en) | 2010-08-19 | 2010-08-19 | Harmonic wave elimination protector of three-phase electricity grid electromagnetic voltage transformator |
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| CN (1) | CN201789267U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931205A (en) * | 2010-08-19 | 2010-12-29 | 张致良 | Three-phase power supply network electromagnetic voltage transformer harmonic elimination protector |
| CN105243941A (en) * | 2015-11-24 | 2016-01-13 | 国网重庆市电力公司电力科学研究院 | Simulation model for inhibiting ferromagnetic resonance of voltage transformer |
-
2010
- 2010-08-19 CN CN2010205052758U patent/CN201789267U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931205A (en) * | 2010-08-19 | 2010-12-29 | 张致良 | Three-phase power supply network electromagnetic voltage transformer harmonic elimination protector |
| CN105243941A (en) * | 2015-11-24 | 2016-01-13 | 国网重庆市电力公司电力科学研究院 | Simulation model for inhibiting ferromagnetic resonance of voltage transformer |
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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 YITIAN ELECTRIC TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHANG ZHILIANG Effective date: 20140114 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140114 Address after: 230001 No. 99 Yonghe Road, Hefei hi tech Development Zone, Anhui Patentee after: Anhui Yitian Electrical Technology Co., Ltd. Address before: Jade Road in Shushan District of Hefei City, Anhui province 230001 No. 715 building A17 Room 606 Xuelin Yayuan Patentee before: Zhang Zhiliang |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110406 Termination date: 20140819 |
|
| EXPY | Termination of patent right or utility model |