CN103208352B - There is the power transformer of D.C. magnetic biasing suppression function based on magnetic temp compensating - Google Patents
There is the power transformer of D.C. magnetic biasing suppression function based on magnetic temp compensating Download PDFInfo
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- CN103208352B CN103208352B CN201310083730.8A CN201310083730A CN103208352B CN 103208352 B CN103208352 B CN 103208352B CN 201310083730 A CN201310083730 A CN 201310083730A CN 103208352 B CN103208352 B CN 103208352B
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Abstract
The present invention relates to a kind of power transformer based on magnetic temp compensating with D.C. magnetic biasing suppression function, including iron core and winding, iron core is made up of common electrical steel disc and magnetic temp compensating material；Winding is made up of first side winding, secondary side winding.By the magnetic resistance of variations in temperature regulation magnetic temp compensating material unshakable in one's determination, complete the effective suppression to transformer DC magnetic bias phenomenon.There is the ability of transformator self-compensation situation D.C. magnetic biasing, reduce transformer loss, energy-saving effect and economic benefit obvious, be suitable to apply in whole power system.
Description
Technical field
The present invention relates to electrical engineering field, refer specifically to a kind of can have the power transformer of intelligent characteristic with the device of Adaptive Suppression transformer neutral point DC magnetic biasing.
Background technology
Mainly there are two kinds of reasons can cause the earth DC potential difference, and then at AC transformer neutral point introducing DC current: first the earth " magnetic storm " phenomenon, the low frequency circulation in the electrical network that can cause；It two is DC transmission system monopole operating mode, if the transformator distance current conversion station of the AC transmission system transformer station neutral ground of operation in parallel is not far, the grounded neutral wire that will make AC transformer produces DC component in the exciting current of transformator, forms loop by the transformer neutral point of transmission line of electricity and the other end.It should be noted that in China's " transferring electricity from the west to the east, north and south confession mutually, national network " power network construction and have employed remote high power DC power transmission mode (HVDC).
The unidirectional current that transformer neutral point introduces forms D.C. magnetic biasing in inside transformer, magnetic flux unshakable in one's determination can be made the most saturated, exciting current high distortion, producing a large amount of harmonic wave, noise significantly increases, and hardware loss increases, reactive loss increases, may result in hot-spot phenomenon time serious, destroy insulation, so that damaging transformator or reducing the life-span.On March 13rd, 1989; DC magnetic bias phenomena causes Quebec, CAN hydroelectric generation to interrupt; the large-sized booster transformer of electric station, east coast of the United States is ruined; the copper lug wherein connecting two low pressure winding conducting wires burns; the protective relaying maloperation of electrical network SVC device is made, and a large amount of capacitors are out of service, and system voltage collapses; finally lose 9500MW load, grid disconnection nearly 9 hours.
At present, power network safe operation is paid much attention to power transformer safe operation problem under D.C. magnetic biasing effect.And the suppressing method causing D.C. magnetic biasing to take corresponding to the earth DC potential mainly has four kinds: neutral point string small resistor method, electric capacity are every straight method, potential compensation method and DC current inverse injection method.
1992; US Experts is with power station, Quebec Radisson/LG2 association as object; propose the scheme of several suppression DC current; its method is the less capacitor of power frequency impedance of being connected by the neutral conductor; with gap, triggered gap and MOV etc. can realize the quick overvoltage protection of neutral point capacitor, scheme is further equipped with mechanical bypass switch.4 set transformators are developed every straight device at the beginning of DEI company of the U.S. 1996；The parameter development 10 set transformators provided according to SIMENS company again for 2003 are every straight device, and for the transformator in HVDC terminal station near India.This device is by 1 4000uF(50Hz) form every straight/logical alternating current container and 2 groups of antiparallel big current bypass passages and mechanical switch bypass.In recent years people utilize the transformer neutral point of Power Electronic Technique exploitation " capacitor+IGCT bypass " mode every straight device.The multiple countries in Europe also put into a large amount of human and material resources and have developed all kinds of transformer DC magnetic bias restraining device.
There is D.C. magnetic biasing problem in China's power network.On the 500kV of Jiangsu, in the two groups of 500kVA main transformers of Changzhou Wu Nan transformer station in river main transformer, Three Gorges dragon's fountain one Jiangsu political affairs flat 500kV DC transmission system, expensive wide DC line, spring city station owner's transformator is all affected by D.C. magnetic biasing.The research that applicant proceeded by about D.C. magnetic biasing problem from 1996, once analyzed D.C. magnetic biasing problem that Fushun power office in 2007 triumph 220,000 volts of 180,000 kilovolt-amperes of power transformers of primary station occur (2-11 ampere bias current detected, cause the noise of up to 90 decibels).D.C. magnetic biasing problem increasingly obtains the extensive concern of Chinese scholar, and D.C. magnetic biasing problem is the most also conducted a research and develops compensation device by many scholars.Tsing-Hua University proposes the suppression for transformer neutral point DC magnetic biasing of a kind of small resistor device.This device was mainly made up of a noninductive resistance and gap, and had carried out installation and checkout at the scene in 2005, and suppression Transformer's Neutral Line Direct Current is had positive effect.Having scholar to describe the method that transformer neutral point injects reverse dc, its cardinal principle is that power supply injects reverse dc through auxiliary earth pole and transformer neutral point loop to transformer neutral point through silicon rectifier after pressure regulator again.Scholar within 2007, is had to propose the new method of a kind of school based on potential compensation principle inspection transformer neutral point DC current, its principle is one small resistor of series connection in the middle of the transformator neutral conductor, on this resistance, form a dc point position by external power source, reach to reduce the purpose of inflow transformer direct current electric current with this dc point position regulating transformer neutral point.Domestic also carried out electric capacity every straight device research and development work.The colleges and universities such as North China Electric Power University, Xi'an Communications University, Zhejiang University the most all do a lot of work, and restrained effectively the impact of transformer DC magnetic bias.
But, all there is certain problem in various methods.Small resistor current limliting method cannot be completely eliminated neutral point direct current, the resistance using bigger resistance of sometimes having to, it is possible to affect main transformer neutral point dielectric strength；Although electric capacity can preferably eliminate neutral point direct current every straight method, but affects the effective grounding of transformator, requiring higher to main transformer neutral point dielectric strength, reply short circuit malfunction ability is poor；Neutral point is injected reverse current lambda limiting process and is needed additionally to build compensation of ground pole, compensates choosing of earth polar extremely difficult.And in long distance power transmission system, the efficiency compensating electric current will reduce, and the power of DC generator will double, and big electric current has also increased the weight of earth mat burden with entering, and accelerate ground net corrosion, and application cost is high；Potential compensation method power consumption is big, and device costly, compensates choosing of earth polar the most difficult.
At present for the suppression of transformer DC magnetic bias, it is substantially and realizes in the suppression of transformator external circuit additional D.C. magnetic biasing and compensation device, have impact on neutral point good earth and the ability of transformator reply suddenly-applied short circuit in some way, add power network safe operation hidden danger in various degree.Currently there is not yet the angle from transformator self design, set up effective structural system in inside transformer, it is achieved the effective ways of suppression transformer DC magnetic bias.If providing the ability of suppression D.C. magnetic biasing impact on transformator electromagnetism operation mechanism, and do not change the connection of power transformer external circuit (particularly neutral point), it would be possible to fundamentally solve D.C. magnetic biasing problem, and ensure that transformer safety is run.
Summary of the invention
Goal of the invention:
The invention provides a kind of power transformer based on magnetic temp compensating with D.C. magnetic biasing suppression function, have employed a kind of magnetic temp compensating material, form new transformer iron core structure, its object is to: by magnetic temp compensating material when the transformer core variations in temperature caused by DC magnetic bias phenomena, realize the regulation to transformer magnetic circuit magnetic resistance, complete the effective suppression to transformer DC magnetic bias phenomenon.
Technical scheme: the present invention implements by the following technical programs:
Have the power transformer of D.C. magnetic biasing suppression function based on magnetic temp compensating, described transformator includes iron core and winding, it is characterised in that:
Iron core is made up of common electrical steel disc and magnetic temp compensating material, and magnetic temp compensating material is arranged on the inside of common electrical steel disc, common electrical steel disc and magnetic temp compensating material composition main magnetic circuit, and the both sides of main magnetic circuit are the first other post and the second other post；Winding is made up of first side winding, secondary side winding.
Advantage and effect:
The present invention is different from traditional power transformer D.C. magnetic biasing Restrain measurement.First, transformer neutral point will not be produced any impact, secondly, it is not necessary to selecting to compensate earth polar, to earth mat without any corrosion, particularly in long distance power transmission system, compensation efficiency is higher.Therefore, power network safe operation hidden danger will not be increased because of the compensation of bias current.The present invention sets up effective structural system in inside transformer, it is achieved the effective ways of suppression transformer DC magnetic bias.Transformator electromagnetism operation mechanism provides the ability of suppression D.C. magnetic biasing impact, and does not change the connection of power transformer external circuit (particularly neutral point), it is only necessary to the least direct current, it becomes possible to produce stronger compensation magnetic flux, and power-off compensation can be realized.Fundamentally solve D.C. magnetic biasing problem, and ensure that transformer safety is run.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the present invention.
Description of reference numerals:
1, common electrical steel disc, 2, magnetic temp compensating material, 3, main magnetic circuit, the 4, first other post, the 5, second other post, 6, first side winding, 7, secondary side winding, 8, transformator.
Detailed description of the invention:
Below in conjunction with the accompanying drawings the present invention is specifically described:
The present invention provides a kind of intelligent electric power transformator, is implanted among traditional transformer by magnetic temp compensating material, forms a kind of power transformer with D.C. magnetic biasing suppression function based on magnetic temp compensating,
Using magnetic temp compensating material, form new transformer iron core structure, the temperature unshakable in one's determination caused by DC magnetic bias phenomena is raised, and is automatically adjusted the magnetic resistance of magnetic temp compensating material, completes the suppression to transformer DC magnetic bias phenomenon.This novel transformator has fully phased out the D.C. magnetic biasing that original transformator introduces at external circuit and has compensated and cancellation element, avoid any change to power transformer neutral ground connected mode, it is ensured that the safety ground of transformer neutral point.When D.C. magnetic biasing problem occurring for transformator, there is AC excitation and DC excitation coupled in common magnetization in iron core, the power transformer with D.C. magnetic biasing suppression function based on magnetic temp compensating has the ability setting up transformator self-compensation situation D.C. magnetic biasing, reduce transformer loss, and then ensure safe operation of power system.
This power transformer based on magnetic temp compensating with D.C. magnetic biasing suppression function of the present invention, as shown in fig. 1, described transformator includes iron core and winding, it is characterized in that: iron core is made up of common electrical steel disc 1 and magnetic temp compensating material 2, magnetic temp compensating material 2 is arranged on the inside of common electrical steel disc 1, common electrical steel disc 1 and magnetic temp compensating material 2 form main magnetic circuit 3, and the both sides of main magnetic circuit 3 are the first other post 4 and the second other post 5；Winding is made up of first side winding 6, secondary side winding 7.
Described iron core is collectively constituted by common electrical steel disc 1 and magnetic temp compensating material 2.
The operation principle of the above-mentioned power transformer based on magnetic temp compensating with D.C. magnetic biasing suppression function:
When there is DC magnetic bias phenomena in transformator 8, iron core 3 temperature caused by DC magnetic bias phenomena raises, and makes the magnetic resistance of magnetic temp compensating material 2 increase, and then makes transformator operating point offset up, make transformator be less susceptible to reach saturated, reach to suppress the purpose of D.C. magnetic biasing；When DC magnetic bias phenomena disappears, the temperature of unshakable in one's determination 3 is gradually reduced, and makes the magnetic resistance of magnetic temp compensating material 2 diminish, and magnetic property strengthens.Transformator is made to be operated in normal condition.
This power transformer based on magnetic temp compensating with D.C. magnetic biasing suppression function of the present invention, by the magnetic resistance of variations in temperature regulation magnetic temp compensating material unshakable in one's determination, completes the effective suppression to transformer DC magnetic bias phenomenon.Having the ability of transformator self-compensation situation D.C. magnetic biasing, reduce transformer loss, energy-saving effect is obvious, obtains certain economic benefit, whole power system is had great practical significance.
Claims (1)
1. there is the power transformer of D.C. magnetic biasing suppression function based on magnetic temp compensating, described transformator includes iron core and winding, it is characterized in that: iron core is made up of common electrical steel disc (1) and magnetic temp compensating material (2), magnetic temp compensating material (2) is arranged on the inside of common electrical steel disc (1), common electrical steel disc (1) and magnetic temp compensating material (2) composition main magnetic circuit (3), the both sides of main magnetic circuit (3) are the first other post (4) and the second other post (5)；Winding is made up of first side winding (6), secondary side winding (7)；When transformator (8) occurs DC magnetic bias phenomena, DC magnetic bias phenomena iron core (3) temperature caused raises, makes the magnetic resistance of magnetic temp compensating material (2) increase；When DC magnetic bias phenomena disappears, the temperature of (3) unshakable in one's determination is gradually reduced, and makes the magnetic resistance of magnetic temp compensating material (2) diminish, and magnetic property strengthens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310083730.8A CN103208352B (en) | 2013-03-15 | 2013-03-15 | There is the power transformer of D.C. magnetic biasing suppression function based on magnetic temp compensating |
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| CN201310083730.8A CN103208352B (en) | 2013-03-15 | 2013-03-15 | There is the power transformer of D.C. magnetic biasing suppression function based on magnetic temp compensating |
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| CN103208352B true CN103208352B (en) | 2016-08-10 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1359115A (en) * | 2000-11-29 | 2002-07-17 | 株式会社东金 | Magnetic core with magnetic offset composite magnet and inductive element using said magnet core |
| CN203134515U (en) * | 2013-03-15 | 2013-08-14 | 沈阳工业大学 | Novel power transformer based on magnetic temperature compensation and having function of direct-current magnetic bias suppression |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61294805A (en) * | 1985-06-24 | 1986-12-25 | Tohoku Metal Ind Ltd | External temperature compensation type inductor |
| JP2003100509A (en) * | 2001-09-27 | 2003-04-04 | Nec Tokin Corp | Magnetic core and inductance part using the same |
| JP2004063885A (en) * | 2002-07-30 | 2004-02-26 | Nec Tokin Corp | Magnetic core and inductance components using the same |
| JP4524751B2 (en) * | 2004-11-25 | 2010-08-18 | 日立金属株式会社 | Magnetic core and electronic component using the same |
| JP5158829B2 (en) * | 2005-03-28 | 2013-03-06 | 日立金属株式会社 | Electronic components |
| CN201532823U (en) * | 2009-11-13 | 2010-07-21 | 宁波盛事达磁业有限公司 | Built-up magnet |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1359115A (en) * | 2000-11-29 | 2002-07-17 | 株式会社东金 | Magnetic core with magnetic offset composite magnet and inductive element using said magnet core |
| CN203134515U (en) * | 2013-03-15 | 2013-08-14 | 沈阳工业大学 | Novel power transformer based on magnetic temperature compensation and having function of direct-current magnetic bias suppression |
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