CN102024554A - Harmonic elimination protector for electromagnetic potential transformer (PT) of three-phase electric network - Google Patents
Harmonic elimination protector for electromagnetic potential transformer (PT) of three-phase electric network Download PDFInfo
- Publication number
- CN102024554A CN102024554A CN2009101450419A CN200910145041A CN102024554A CN 102024554 A CN102024554 A CN 102024554A CN 2009101450419 A CN2009101450419 A CN 2009101450419A CN 200910145041 A CN200910145041 A CN 200910145041A CN 102024554 A CN102024554 A CN 102024554A
- Authority
- CN
- China
- Prior art keywords
- harmonic elimination
- voltage transformer
- resistance
- electromagnetic
- elimination protector
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
- H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
- H01F27/425—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for voltage transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a harmonic elimination protector for an electromagnetic potential transformer (PT) of a three-phase electric network. The harmonic elimination protector comprises a resistor, particularly the resistor is connected in parallel with a resettable fuse (PPTC) to form the harmonic elimination protector (PTK) which is connected in series between a neutral point on the primary side of a three-phase electromagnetic PT and the ground so as to prevent ferromagnetic resonance overvoltage, wherein the PPTC is an REG-series product of American reychem Company; and the resistor is a linear resistor (R) or a nonlinear resistor (FR). The harmonic elimination protector can effectively eliminate ferromagnetic resonance caused by the use of the electromagnetic PT in an electric system, prevents generated overvoltage from damaging various types of equipment in the system, does not affect the normal operation of other protective devices in the electric system, has the advantages of simple structure, convenience of use and low manufacturing and using costs and can be widely applied to an electric system with the electromagnetic PT in a 3-35 kV three-phase electric network.
Description
Technical field
The present invention 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.
Summary of the invention
The technical problem to be solved in the present invention 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 invention, 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 present invention 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 present invention can eliminate 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 present invention realize its function.
Description of drawings
Below in conjunction with accompanying drawing optimal way of the present invention is described in further detail.
Fig. 1 is a kind of basic structure schematic diagram of the present invention, and the resistance among the figure is linear resistance R;
Fig. 2 is an another kind of basic structure schematic diagram of the present invention, 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 invention; 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 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 (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 |
|---|---|---|---|
| CN2009101450419A CN102024554A (en) | 2009-09-21 | 2009-09-21 | Harmonic elimination protector for electromagnetic potential transformer (PT) of three-phase electric network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101450419A CN102024554A (en) | 2009-09-21 | 2009-09-21 | Harmonic elimination protector for electromagnetic potential transformer (PT) of three-phase electric network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102024554A true CN102024554A (en) | 2011-04-20 |
Family
ID=43865738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101450419A Pending CN102024554A (en) | 2009-09-21 | 2009-09-21 | Harmonic elimination protector for electromagnetic potential transformer (PT) of three-phase electric network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102024554A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332685A (en) * | 2011-08-13 | 2012-01-25 | 陈劲游 | Self-powered three-phase four-wire electronic transformer high-voltage electric energy metering cabinet or metering box capable of preventing ferromagnetic resonance |
| CN102332684A (en) * | 2011-08-13 | 2012-01-25 | 陈劲游 | Ferromagnetic resonance-preventing self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box |
| CN102360899A (en) * | 2011-08-13 | 2012-02-22 | 陈劲游 | Ferroresonance-preventing self-power supply device of electronic combined transformer |
| CN102360880A (en) * | 2011-08-13 | 2012-02-22 | 陈劲游 | Ferroresonance-preventing self-power supply device of electronic voltage transformer |
| EP2620959A1 (en) * | 2012-01-26 | 2013-07-31 | Eaton Industries (Netherlands) B.V. | Voltage measuring transformer |
| CN106249100A (en) * | 2016-08-17 | 2016-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of high-tension fuse ferromagnetic resonance tolerance performance detecting system and method |
| CN108767815A (en) * | 2018-07-17 | 2018-11-06 | 云南电网有限责任公司红河供电局 | Electromagnetic potential transformer auto by pass harmonic elimination apparatus |
| CN110323731A (en) * | 2019-07-03 | 2019-10-11 | 张安斌 | Voltage transformer primary side neutral point controllable impedance harmonic elimination apparatus |
| CN110416987A (en) * | 2019-07-08 | 2019-11-05 | 国网天津市电力公司电力科学研究院 | Voltage transformer overvoltage inhibiting apparatus based on sensitive characteristic |
| CN110768222A (en) * | 2019-10-24 | 2020-02-07 | 深圳供电局有限公司 | Voltage transformer resonance elimination device and protection equipment |
| CN115792781A (en) * | 2022-12-28 | 2023-03-14 | Abb瑞士股份有限公司 | Monitoring device, power equipment and method for monitoring voltage transformer |
-
2009
- 2009-09-21 CN CN2009101450419A patent/CN102024554A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332685B (en) * | 2011-08-13 | 2014-12-10 | 陈劲游 | Self-powered three-phase four-wire electronic transformer high-voltage electric energy metering cabinet or metering box capable of preventing ferromagnetic resonance |
| CN102332684A (en) * | 2011-08-13 | 2012-01-25 | 陈劲游 | Ferromagnetic resonance-preventing self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box |
| CN102360899A (en) * | 2011-08-13 | 2012-02-22 | 陈劲游 | Ferroresonance-preventing self-power supply device of electronic combined transformer |
| CN102360880A (en) * | 2011-08-13 | 2012-02-22 | 陈劲游 | Ferroresonance-preventing self-power supply device of electronic voltage transformer |
| CN102332685A (en) * | 2011-08-13 | 2012-01-25 | 陈劲游 | Self-powered three-phase four-wire electronic transformer high-voltage electric energy metering cabinet or metering box capable of preventing ferromagnetic resonance |
| CN102360880B (en) * | 2011-08-13 | 2013-09-04 | 陈劲游 | Ferroresonance-preventing self-power supply device of electronic voltage transformer |
| CN102360899B (en) * | 2011-08-13 | 2013-09-04 | 陈劲游 | Ferroresonance-preventing self-power supply device of electronic combined transformer |
| CN102332684B (en) * | 2011-08-13 | 2014-12-03 | 陈劲游 | Ferromagnetic resonance-preventing self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box |
| EP2620959A1 (en) * | 2012-01-26 | 2013-07-31 | Eaton Industries (Netherlands) B.V. | Voltage measuring transformer |
| CN106249100A (en) * | 2016-08-17 | 2016-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of high-tension fuse ferromagnetic resonance tolerance performance detecting system and method |
| CN106249100B (en) * | 2016-08-17 | 2023-08-01 | 云南电网有限责任公司电力科学研究院 | Ferromagnetic resonance tolerance performance detection system and method for high-voltage fuse |
| CN108767815A (en) * | 2018-07-17 | 2018-11-06 | 云南电网有限责任公司红河供电局 | Electromagnetic potential transformer auto by pass harmonic elimination apparatus |
| CN108767815B (en) * | 2018-07-17 | 2024-02-02 | 云南电网有限责任公司红河供电局 | Automatic bypass resonance elimination device of electromagnetic voltage transformer |
| CN110323731A (en) * | 2019-07-03 | 2019-10-11 | 张安斌 | Voltage transformer primary side neutral point controllable impedance harmonic elimination apparatus |
| CN110323731B (en) * | 2019-07-03 | 2021-05-11 | 张安斌 | Voltage transformer primary side neutral point controllable impedance resonance elimination device |
| CN110416987A (en) * | 2019-07-08 | 2019-11-05 | 国网天津市电力公司电力科学研究院 | Voltage transformer overvoltage inhibiting apparatus based on sensitive characteristic |
| CN110768222A (en) * | 2019-10-24 | 2020-02-07 | 深圳供电局有限公司 | Voltage transformer resonance elimination device and protection equipment |
| CN115792781A (en) * | 2022-12-28 | 2023-03-14 | Abb瑞士股份有限公司 | Monitoring device, power equipment and method for monitoring voltage transformer |
| WO2024139914A1 (en) * | 2022-12-28 | 2024-07-04 | Abb瑞士股份有限公司 | Monitoring apparatus, power device, and method for monitoring voltage transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102024554A (en) | Harmonic elimination protector for electromagnetic potential transformer (PT) of three-phase electric network | |
| CN107505553A (en) | A kind of power frequency continued flow experimental rig and its application method | |
| CN204089187U (en) | A kind of Surge Protector | |
| CN105098748A (en) | Surge protector and method for enhancing temporary overvoltage endurance thereof | |
| CN101931205A (en) | Three-phase power supply network electromagnetic voltage transformer harmonic elimination protector | |
| CN203551726U (en) | Electric locomotive roof insulation detecting device | |
| CN202059142U (en) | Three-phase electric power electrical network electromagnetic voltage transformer harmonic eliminating protector | |
| CN104518506A (en) | Arc suppresser allowing distinguishing of intra-station arc grounding, extra-station grounding and motor stator arc grounding | |
| CN201789267U (en) | Harmonic wave elimination protector of three-phase electricity grid electromagnetic voltage transformator | |
| CN201576522U (en) | Compound needle type zinc oxide arrester | |
| CN201478821U (en) | Overvoltage protector for indirect neutral point-grounding power system in three-phase power grid | |
| CN102290805A (en) | Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system | |
| CN201887537U (en) | Arc extinguishing cabinet | |
| CN204967222U (en) | Overcurrent protection structure | |
| CN206628823U (en) | A kind of FSR high capacity and high speed switchgearses | |
| CN204333940U (en) | A kind of intelligence revises nonlinear resistance type resonance eliminator | |
| CN106921149A (en) | A kind of FSR high capacity and high speed switchgearses | |
| CN205303080U (en) | Resistant bar -shaped suspension type composite insulator of lightning impulse | |
| CN208299437U (en) | A kind of energy consumption molded line road composite lightning-protection device certainly | |
| CN202363880U (en) | Transformer protective circuit | |
| CN201388042Y (en) | Central high-voltage switch equal-height cabinet | |
| CN206850417U (en) | One kind is based on LC parallel resonance depth current-limiting apparatus | |
| CN205945048U (en) | Three -phase combined type over -voltage protector | |
| CN204517398U (en) | Low residual voltage zinc oxide arrester | |
| CN201387999Y (en) | Central high-low cabinet type intelligent arc extinction, harmonic elimination and route selection device |
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: 20110420 |