CN202996511U - Novel power transformer with direct-current magnetic bias compensation function - Google Patents
Novel power transformer with direct-current magnetic bias compensation function Download PDFInfo
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- CN202996511U CN202996511U CN 201220607350 CN201220607350U CN202996511U CN 202996511 U CN202996511 U CN 202996511U CN 201220607350 CN201220607350 CN 201220607350 CN 201220607350 U CN201220607350 U CN 201220607350U CN 202996511 U CN202996511 U CN 202996511U
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Abstract
The utility model relates to a novel power transformer with a direct-current magnetic bias compensation function. The novel power transformer comprises an iron core and a winding. The iron core is composed of a common electrical steel sheet, a two-phase magnetic material and air gaps. The winding is composed of a primary side winding, a secondary side winding and a compensation and control winding. Magnetic bias flux is detected through a hall current sensor; intelligent conversion of the two-phase magnetic material between a magnetic conduction function and a direct-current excitation function is achieved through a control device; detection, control and elimination for a direct-current magnetic bias phenomenon of the transformer are completed; direct-current magnetic bias self-compensation capacity of the transformer is achieved, loss of the transformer is reduced, energy-saving effects and economic benefits are obvious, and the power transformer is suitable for being used in the whole power system.
Description
Technical field
The utility model relates to the electrical engineering field, specifically refers to a kind of device that can the adaptive equalization transformer neutral point DC magnetic biasing, has the power transformer of intelligent characteristic.
Background technology
Mainly contain two kinds of reasons and can cause the earth DC potential difference, and then introduce direct current at the AC transformer neutral point: 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 modes, if not far apart from current conversion station with the transformer of the AC transmission system transformer station neutral ground of its parallel running, will make the grounded neutral wire of AC transformer produce DC component in the exciting current of transformer, by the transformer neutral point formation loop of transmission line and the other end.It should be noted that in China's " transferring electricity from the west to the east, north and south is confession mutually, national network " power network construction and adopted remote high power DC power transmission mode (HVDC).
The direct current that transformer neutral point is introduced is in the inner D.C. magnetic biasing that forms of transformer, can make magnetic flux unshakable in one's determination seriously saturated, the exciting current high distortion, produce a large amount of harmonic waves, noise obviously increases, and the hardware loss increases, reactive loss increases, may cause the local overheating phenomenon when serious, destroy insulation, so that damage transformer or reduce the life-span.On March 13rd, 1989; DC magnetic bias phenomena causes Quebec, CAN hydroelectric power generation interruption; the large-sized booster transformer in power station, east coast of the united states is ruined; the copper connector lug that wherein connects two low pressure winding conducting wires burns; the protective relaying maloperation of electrical network SVC device is done, and a large amount of capacitors are out of service, the system voltage collapse; finally lose 9500MW load, grid disconnection nearly 9 hours.
At present, pay much attention to the safe operation problem of power transformer under the D.C. magnetic biasing effect in the power network safe operation.And causing that corresponding to the earth DC potential inhibition method that D.C. magnetic biasing is taked mainly contains four kinds: neutral point string small resistor method, electric capacity are every straight method, potential compensation method and direct current inverse injection method.
1992; US Experts is take hydroelectric station, Quebec Radisson/LG2 association as object; the scheme of several inhibition direct currents has been proposed; its method is with the neutral line less capacitor of power frequency impedance of connecting; but realize the quick overvoltage protection of neutral point capacitor with gap triggered gap and MOV etc., scheme also is equipped with mechanical by-pass switch.4 cover transformers have been developed at the beginning of U.S. DEI company 1996 every straight device; The parameter development that provided according to SIMENS company again in 2003 10 cover transformers every straight device, and be used for transformer near a HVDC terminal station of India.This device is by 1 4000uF(50Hz) form every straight/logical alternating current container and 2 groups of antiparallel large current bypass passages and mechanical switch bypass.In recent years people utilize the transformer neutral point of power electronic technology exploitation " capacitor+thyristor bypass " mode every straight device.A plurality of countries in Europe also drop into a large amount of human and material resources and have developed all kinds of transformer DC magnetic bias restraining devices.
There is the D.C. magnetic biasing problem in China's power network.In two groups of 500kVA main transformers of Changzhou Wu Nan transformer station in the upper river of Jiangsu 500kV main transformer, the Three Gorges dragon's fountain one flat 500kV DC transmission system of Jiangsu political affairs, expensive wide DC line, spring city station owner's transformer all is subject to the impact of D.C. magnetic biasing.The applicant carried out the research of relevant D.C. magnetic biasing problem since 1996, had once analyzed the D.C. magnetic biasing problem (2-11 ampere bias current detected, cause the noise up to 90 decibels) of 220,000 volts of 180,000 kilovolt-amperes of power transformers appearance of Fushun power office's triumph primary station in 2007.The D.C. magnetic biasing problem more and more obtains the extensive concern of Chinese scholar, and many scholars also conduct a research and develop compensation arrangement the D.C. magnetic biasing problem for many years.Tsing-Hua University has proposed the inhibition that a kind of small resistor device is used for transformer neutral point DC magnetic biasing.This device mainly is comprised of a noninductive resistance and gap, and has carried out at the scene installation and checkout in 2005, to suppressing Transformer's Neutral Line Direct Current, positive effect is arranged.Have the scholar to introduce the method that transformer neutral point injects reverse dc, its cardinal principle is power supply through injecting reverse dc through the auxiliary earth utmost point and transformer neutral point loop to transformer neutral point through silicon rectifier again after voltage regulator.There was the scholar to propose a kind of new method of examining transformer neutral point DC current based on the school of potential compensation principle in 2007, its principle is small resistor of series connection in the middle of the transformer neutral line, form a dc point position by external power source on this resistance, reach with this dc point position of regulating transformer neutral point the purpose that reduces inflow transformer winding direct current.Domesticly also carried out the research and development work of electric capacity every straight device.The colleges and universities such as North China Electric Power University, Xi'an Communications University, Zhejiang University also all do a lot of work, and have effectively suppressed the impact of transformer DC magnetic bias.
But all there is certain problem in the whole bag of tricks.Small resistor current limliting method can't be eliminated neutral point direct current fully, sometimes has to adopt the resistance of larger resistance, might affect main transformer neutral point insulation intensity; Although electric capacity can be eliminated neutral point direct current preferably every straight method, affects the effective grounding of transformer, higher to main transformer neutral point insulation requirement of strength, reply short circuit malfunction ability is relatively poor; Neutral point injects the reverse current lambda limiting process need to build the compensation of ground utmost point in addition, compensates choosing of earth polar extremely difficult.And at the remote conveying electric system, the efficient of offset current will reduce, and the power of dc generator will double, and the earth mat burden has also been increased the weight of in large electric inflow place, accelerate ground net corrosion, and application cost is high; Potential compensation method power consumption is large, install more expensive, the compensation earth polar choose also more difficult.
Present inhibition for transformer DC magnetic bias, substantially all realize in the additional D.C. magnetic biasing inhibition of transformer external circuit and compensation arrangement, affect in some way the ability of neutral point good earth and transformer reply suddenly-applied short circuit, increased in various degree power network safe operation hidden danger.The current angle of not yet seeing from transformer self design is set up effective structural system in transformer inside, realizes suppressing the effective ways of transformer DC magnetic bias.If the ability that suppresses the D.C. magnetic biasing impact is provided, and do not change the connection of power transformer external circuit (particularly neutral point) on transformer electromagnetism operation mechanism, might fundamentally solve the D.C. magnetic biasing problem, and can guarantee the transformer safe operation.
Summary of the invention
Goal of the invention:
The utility model provides a kind of novel electric power transformer with D.C. magnetic biasing compensate function, adopted a kind of novel two-phase magnetic material, form new transformer iron core structure, its purpose is: by setting up detection system, controlling the winding realization to the intelligent conversion of this two-phase magnetic material between magnetic conduction function and DC excitation function, complete " detect, control and eliminate " to the DC magnetic bias phenomena of transformer.
Technical scheme: the utility model is implemented by the following technical programs:
Novel electric power transformer with D.C. magnetic biasing compensate function, described transformer comprises iron core and winding, it is characterized in that: unshakable in one's determination formed by electrical sheet and two-phase magnetic material and air gap, the two-phase magnetic material is arranged on a side of electrical sheet, the centre of electrical sheet is main magnetic circuit, and the both sides of electrical sheet are the first other post and the second other post; Winding is comprised of first side winding, secondary side winding and compensation, control winding, and first side winding and secondary side winding are wound on main magnetic circuit, and compensation, control winding technique are on the two-phase magnetic material; This transformer also is provided with the bias current checkout gear, and the bias current checkout gear is comprised of first side winding lead-out wire and Hall current sensor, and the first side winding lead-out wire passes Hall current sensor; Compensation, control winding are connected with control device.
Described air gap is divided into the first air gap, interstice, the 3rd air gap and the 4th air gap, and the first air gap is located at the bottom of the second other post, and interstice is located in the middle of the second other post, and the 3rd air gap is located at the top of the second other post, and the 4th air gap is located at the top of the first other post.
Compensation, control winding and be arranged on two-phase magnetic material both sides.
Advantage and effect:
The utility model is different from traditional power transformer D.C. magnetic biasing and suppresses scheme.At first, can not produce any impact to transformer neutral point, secondly, need not to select to compensate the earth polar, without any corrosion, in the remote conveying electric system, compensation efficiency is higher especially to earth mat.Therefore, the net safe operation hidden danger that can not increase electric power because of the compensation of bias current.The utility model is set up effective structural system in transformer inside, realizes suppressing the effective ways of transformer DC magnetic bias.The ability that suppresses the D.C. magnetic biasing impact is provided on transformer electromagnetism operation mechanism, and does not change the connection of power transformer external circuit (particularly neutral point), only need very little direct current, just can produce stronger compensation magnetic flux, and can realize the outage compensation.Fundamentally solve the D.C. magnetic biasing problem, and can guarantee the transformer safe operation.
Description of drawings:
Fig. 1 is structural representation of the present utility model.
Description of reference numerals:
1, electrical sheet, 2, the two-phase magnetic material, the 3, first air gap, 4, interstice, the 5, the 3rd air gap, the 6, the 4th air gap, 7, main magnetic circuit, 8, first side winding, 9, secondary side winding, 10, compensation, control winding, 11, the first side winding lead-out wire, 12, Hall current sensor, 13, control device, 14, transformer, the 15, first other post, the 16, second other post.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is specifically described:
The utility model provides a kind of intelligent electric power transformer, the two-phase magnetic material is implanted among traditional transformer, form a kind of intelligent electric power transformer that suppresses the D.C. magnetic biasing function that has, adopted a kind of novel two-phase magnetic material, form new transformer iron core structure, by setting up detection system, controlling the winding realization to the intelligent conversion of this two-phase magnetic material between magnetic conduction function and DC excitation function, complete " detect, control and eliminate " to the DC magnetic bias phenomena of transformer.This novel transformer has fully phased out D.C. magnetic biasing compensation and cancellation element that original transformer introduces at external circuit, has avoided any change to power transformer neutral ground connected mode, has guaranteed the safety ground of transformer neutral point.When the D.C. magnetic biasing problem occurring for transformer, there is AC excitation and the DC excitation magnetization that jointly is coupled in iron core, the novel electric power transformer that can realize flux regulator two-phase magnetic material has the ability of setting up transformer self-compensation situation D.C. magnetic biasing, reduce transformer loss, and then ensure safe operation of power system.
This novel electric power transformer with D.C. magnetic biasing compensate function of the utility model, as shown in fig. 1, described transformer comprises iron core and winding, it is characterized in that: unshakable in one's determination formed by electrical sheet 1 and two-phase magnetic material 2 and air gap, two-phase magnetic material 2 is arranged on a side of electrical sheet 1, the centre of electrical sheet 1 is main magnetic circuit 7, and the both sides of electrical sheet 1 are the first other post 15 and the second other post 16; Winding is comprised of first side winding 8, secondary side winding 9 and compensation, control winding 10, and first side winding 8 and secondary side winding 9 are wound on main magnetic circuit 7, and compensation, control winding 10 are wound on two-phase magnetic material 2; This transformer also is provided with the bias current checkout gear, and the bias current checkout gear is comprised of first side winding lead-out wire 11 and Hall current sensor 12, and first side winding lead-out wire 11 passes Hall current sensor 12; Compensation, control winding 10 are connected with control device 13.
Described air gap is divided into the first air gap 3, interstice 4, the 3rd air gap 5 and the 4th air gap 6, the first air gap 3 is located at the bottom of the second other post 16, interstice 4 is located in the middle of the second other post 16, and the 3rd air gap 5 is located at the top of the second other post 16, and the 4th air gap 6 is located at the top of the first other post 15.
Compensation, control winding 10 and be arranged on two-phase magnetic material 2 both sides, transformer primary Working winding first side winding 8 and secondary side winding 9 are constant.
Above-mentioned operation principle with novel electric power transformer of D.C. magnetic biasing compensate function: when DC magnetic bias phenomena occurs transformer 14, by Hall current sensor 12, the DC magnetic bias current signal is sent into control device 13, then control device 13 sends direct current to compensation, control winding 10, produce the compensation magnetic flux opposite with bias current and suppress D.C. magnetic biasing, existence due to interstice 4 and the 4th air gap 6, the compensation magnetic flux can not flowed in the first other post 15 and the second other post 16, compensation, process of inhibition are completed in main magnetic circuit 7; When transformer 14 D.C. magnetic biasings disappearances or non DC bias phenomenon, by Hall current sensor 12, detection signal is sent into control device 13, control device 13 produces single-phase sinusoidal voltages two-phase magnetic material 2 is demagnetized.Due to the existence of the 3rd air gap 5, the exchange flux that produces when making transformer 14 normal operation can not exert an influence to compensation magnetic.
This novel electric power transformer with D.C. magnetic biasing compensate function of the utility model, detect the magnetic bias magnetic flux by setting up Hall current sensor, then realize the intelligent conversion of this two-phase magnetic material between magnetic conduction function and DC excitation function by control device, complete " detect, control and eliminate " to the DC magnetic bias phenomena of transformer.Ability with transformer self-compensation situation D.C. magnetic biasing reduces transformer loss, and energy-saving effect is obvious, obtains certain economic benefit, and whole electric power system is had great practical significance.
Claims (3)
1. the novel electric power transformer that has the D.C. magnetic biasing compensate function, described transformer comprises iron core and winding, it is characterized in that: unshakable in one's determination formed by electrical sheet (1) and two-phase magnetic material (2) and air gap, two-phase magnetic material (2) is arranged on a side of electrical sheet (1), the centre of electrical sheet (1) is main magnetic circuit (7), and the both sides of electrical sheet (1) are the first other post (15) and the second other post (16); Winding is comprised of first side winding (8), secondary side winding (9) and compensation, control winding (10), first side winding (8) and secondary side winding (9) are wound on main magnetic circuit (7), and compensation, control winding (10) are wound on two-phase magnetic material (2); This transformer also is provided with the bias current checkout gear, and the bias current checkout gear is comprised of first side winding lead-out wire (11) and Hall current sensor (12), and first side winding lead-out wire (11) passes Hall current sensor (12); Compensation, control winding (10) are connected with control device (13).
2. the novel electric power transformer that has according to claim 1 the D.C. magnetic biasing compensate function, it is characterized in that: described air gap is divided into the first air gap (3), interstice (4), the 3rd air gap (5) and the 4th air gap (6), the first air gap (3) is located at the bottom of the second other post (16), interstice (4) is located in the middle of the second other post (16), the 3rd air gap (5) is located at the top of the second other post (16), and the 4th air gap (6) is located at the top of the first other post (15).
3. have according to claim 1 the novel electric power transformer of D.C. magnetic biasing compensate function, it is characterized in that: compensation, control winding (10) and be arranged on two-phase magnetic material (2) both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220607350 CN202996511U (en) | 2012-11-16 | 2012-11-16 | Novel power transformer with direct-current magnetic bias compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220607350 CN202996511U (en) | 2012-11-16 | 2012-11-16 | Novel power transformer with direct-current magnetic bias compensation function |
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| Publication Number | Publication Date |
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| CN202996511U true CN202996511U (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220607350 Withdrawn - After Issue CN202996511U (en) | 2012-11-16 | 2012-11-16 | Novel power transformer with direct-current magnetic bias compensation function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969126A (en) * | 2012-11-16 | 2013-03-13 | 沈阳工业大学 | Novel power transformer with direct-current magnetic bias compensation function |
| CN103576030A (en) * | 2013-11-12 | 2014-02-12 | 国家电网公司 | Transformer on-line monitoring sensor |
| CN104021926A (en) * | 2014-06-20 | 2014-09-03 | 沈阳工业大学 | Novel power transformer with functions of direct current magnetic bias and reactive compensation |
-
2012
- 2012-11-16 CN CN 201220607350 patent/CN202996511U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969126A (en) * | 2012-11-16 | 2013-03-13 | 沈阳工业大学 | Novel power transformer with direct-current magnetic bias compensation function |
| CN102969126B (en) * | 2012-11-16 | 2016-11-23 | 沈阳工业大学 | There is D.C. magnetic biasing and compensate the novel electric power transformator of function |
| CN103576030A (en) * | 2013-11-12 | 2014-02-12 | 国家电网公司 | Transformer on-line monitoring sensor |
| CN103576030B (en) * | 2013-11-12 | 2016-03-30 | 国家电网公司 | A kind of transformer online monitoring sensor |
| CN104021926A (en) * | 2014-06-20 | 2014-09-03 | 沈阳工业大学 | Novel power transformer with functions of direct current magnetic bias and reactive compensation |
| CN104021926B (en) * | 2014-06-20 | 2016-03-30 | 沈阳工业大学 | A kind of power transformer having D.C. magnetic biasing and no-power compensation function concurrently |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130612 Effective date of abandoning: 20161012 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |