CN205786940U - A kind of test circuit under transformer DC magnetic bias effect - Google Patents
A kind of test circuit under transformer DC magnetic bias effect Download PDFInfo
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- CN205786940U CN205786940U CN201620477493.2U CN201620477493U CN205786940U CN 205786940 U CN205786940 U CN 205786940U CN 201620477493 U CN201620477493 U CN 201620477493U CN 205786940 U CN205786940 U CN 205786940U
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Abstract
This utility model relates to transformer technology parameter field under D.C. magnetic biasing, particularly to the test circuit under a kind of transformer DC magnetic bias effect.Test circuit under this transformer DC magnetic bias effect, including the first tested transformator and the second tested transformator, it is characterized in that: the low pressure winding of described first tested transformator and the low pressure winding parallel connection of the second tested transformator are followed by intermediate transformer, two high pressure winding line ends link together, and the high pressure neutral point of the first tested transformator links together with the neutral point of the second tested transformator after penetrating controllable direct current power supply circuit.This utility model is simple to operate, practical, with a high credibility, solve transformator be designed without stalloy in Direct Current Bias under iron losses curve and an exciting power curve difficult problem, Exact Design and testing transformer technical parameter under different Direct Current Bias is had very important meaning.
Description
(1) technical field
This utility model relates to transformer technology parameter field under D.C. magnetic biasing, particularly to a kind of transformer DC magnetic bias
Test circuit under Zuo Yong.
(2) background technology
Present stage, along with the development of high voltage AC-HVDC, AC electric train electric power system, direct current transportation monopolar operation and
Geomagnetic storms etc. are all the power supplys producing DC current in the earth；When DC current flows through the neutrality of the transformator of neutral ground
During point, transformator will be carried out excitation and produce DC magnetic bias phenomena, if transformer device structure is single-phase zone return yoke or three-phase five-limb,
Owing to this structure is the iron circuit that direct current flux provides Guan Bi, magnetic resistance is less, under the effect of identical magnetic potential, magnetic
Logical relatively big, some technical parameter of transformator will be by large effect；For three-phase full-bridge converter or without the list of return yoke
For phase transformer, owing to not providing ferromagnetic circuit to direct current flux, so the magnetic flux flowing through iron core is relatively small, for this
From the point of view of planting the transformator of structure, its ability bearing D.C. magnetic biasing is the strongest.
From the point of view of current national grid demand, Large Copacity, the demand of high voltage single-phase transformer grow with each passing day, especially
In 500KV-1000KV self coupling current transformer in AC transmission system and DC transmission system ± 200KV-± 800KV changes
Convertor transformer, their structural shape typically uses single-phase zone return yoke formula structure, and high pressure neutral point is operationally direct
Ground connection, especially sensitive to D.C. magnetic biasing effect.
Effect for D.C. magnetic biasing, it is easy to a kind of misunderstanding of generation is: enter the direct current flux of transformator with original
Exchange flux superimposed, produce D.C. magnetic biasing effect, say, that under normal circumstances, the least exciting current (0.15%IN)
Can produce rated flux, if now there being a certain amount of DC current (10A-15A) to enter transformator, produced direct current flux will
Much larger than rated flux.If this two parts magnetic flux is the most superimposed, then main flux can be made significantly to offset to side, cause iron core
The most saturated, exciting current distortion is serious, open circuit loss, noise, vibration and leakage magnetic flux increase etc., and true really not so, because of
Excitation property for stalloy has non-linear, it is impossible to the skew of operating point is analyzed to utilize principle of stacking to be simply considered that.
But how to consider the size exciting current to transformator, open circuit loss, noise, vibration and the leakage magnetic flux of D.C. magnetic biasing
Impact, from the point of view of current open source information, so that some simple stalloy models make in scientific research institution, carry out alternating current-direct current excitation feelings
Research under condition, but disclosed in data less and time data use on the transformer and between measured value deviation the biggest；Two are
Utilize coupled field-circuit method to carry out transformator simulation analysis under Direct Current Bias, but do not consider stalloy in the process length emulated
Insulation between plates, seam and silicon steel structure and the anisotropy of material, some distortion of result；So at present can't be accurately
Quantifying the relation of D.C. magnetic biasing and these technical data, can only rule of thumb carry out rough estimation, reference value is relatively low, right
Exact Design transformator brings bigger difficulty.
(3) summary of the invention
This utility model is in order to make up the deficiencies in the prior art, it is provided that a kind of simple to operate, practical, with a high credibility
Transformer DC magnetic bias effect under test circuit.
This utility model is achieved by the following technical solution:
Test circuit under a kind of transformer DC magnetic bias effect, including the first tested transformator and the second tested transformation
Device, it is characterised in that: the low pressure winding of described first tested transformator and the low pressure winding parallel of the second tested transformator connect
Being followed by intermediate transformer, two high pressure winding line ends link together, and the high pressure neutral point of the first tested transformator penetrates controlled
After DC power supply circuit, the neutral point with the second tested transformator links together.
More excellent technical scheme of the present utility model is:
Described controllable direct current power supply circuit by adjustable resistance, DC source and direct current pacify after times table series connection again with standard capacitance
Device parallel connection is constituted；Controlled the size of DC source output electric current by regulation adjustable resistance, standard capacitor is alternating current
(asymmetric electric current) provides a bypass, is a protection device simultaneously, is used for preventing circulation from causing DC source and instrument instrument
Table damages.
Described first tested transformator and the second tested transformator are two completely identical in structure single-phase transformers；Run
In transformator be usually the three phase transformers that is made up of three single-phase transformers, as long as transformator producer produces, the most all
Possesses this condition.
Described intermediate transformer connects generator alternating current power supply, provides alternating current for it.
The test method using above-mentioned test circuit to carry out, comprises the steps:
(1) controlled the size of DC source output electric current by regulation adjustable resistance, standard capacitor is alternating current power supply
One bypass is provided, uses simultaneously as protection device；
(2) big according to the DC resistance being applied to the DC current in high-voltage parallel loop and two high pressure windings itself
Little, after regulation adjustable resistance, the low pressure of the first tested transformator and the second tested transformator is carried out rated excitation, utilizes instrument
Instrument accurately measures the parameter such as the exciting current of transformator, open circuit loss, noise and vibration under D.C. magnetic biasing.
This utility model is simple to operate, practical, with a high credibility, solves transformator and exists being designed without stalloy
Iron losses curve and an exciting power curve difficult problem under Direct Current Bias, to Exact Design and testing transformer in different D.C. magnetic biasings
Under the conditions of technical parameter have very important meaning, be conducive at 500KV-1000KV self coupling power transformer and HVDC
In transmission system use ± 200KV-± 800KV converter power transformer on apply.
(4) accompanying drawing explanation
Below in conjunction with the accompanying drawings this utility model is further described.
Fig. 1 is structural representation of the present utility model.
In figure, 1 first tested transformator, 2 second tested transformators, 3 intermediate transformers, 4 adjustable resistances, 5 DC sources,
6 direct current peace times tables, 7 standard capacitors.
(5) detailed description of the invention
Accompanying drawing is a kind of specific embodiment of the present utility model.This embodiment includes the first tested transformator 1 and the second quilt
After examination transformator 2, the low pressure winding of described first tested transformator 1 and the low pressure winding parallel of the second tested transformator 2 connect
Being connected to intermediate transformer 3, two high pressure winding line ends link together, and the high pressure neutral point of the first tested transformator 1 penetrates controlled
After DC power supply circuit, the neutral point with the second tested transformator 2 links together；Described controllable direct current power supply circuit is by adjustable
Resistance 4, DC source 5 and direct current peace times table 6 are in parallel with standard capacitor 7 again after connecting to be constituted；Described first tested transformator 1
It is two completely identical in structure single-phase transformers with the second tested transformator 2；Described intermediate transformer 3 connects generator alternating current
Power supply.
First have at the trial to find two completely identical in structure single-phase transformers (operating transformator be usually by
The three phase transformers of three single-phase transformer compositions, as long as transformator producer produces, the most all possesses this condition).Then
The low pressure winding parallel of these two tested transformators being connected and be followed by intermediate transformer, high pressure line end links together, the
The high pressure neutral point of one tested transformator 1 is connected with the neutral point of the second tested transformator 2 after penetrating controllable direct current power supply circuit
Together, wherein controllable direct current power supply circuit be connected by adjustable resistance 4, DC source 5, DC ammeter 6 after again with standard
Capacitor 7 composition in parallel, control DC source 5 by regulation adjustable resistance 4 and export the size of electric current, standard capacitor 7
There is provided a bypass for alternating current (asymmetric electric current), be a protection device simultaneously, be used for preventing circulation from causing unidirectional current
Source 5 is damaged with instrument and meter.Straight finally according to the DC current being applied in high-voltage parallel loop and two high pressure windings itself
Leakage resistance value size, after regulation adjustable resistance, carries out rated excitation to the low pressure of tested transformator, utilizes corresponding instrument and meter
Just can accurately measure the parameter such as the exciting current of transformator, open circuit loss, noise and vibration under D.C. magnetic biasing.
Can also utilize this set test circuit and instrument and meter, measuring transformer is encouraged in different DC, difference simultaneously
Relation between magnetoelectricity pressure and exciting current, open circuit loss, noise and vibration, and it is depicted as curve, for designer's reference,
DC current, excitation voltage especially can also be utilized to derive in this maker work with exciting current, open circuit loss relation curve
Iron losses curve unshakable in one's determination used by transformator under the conditions of skill and exciting power curve；When design of transformer engineer designs afterwards only
Need to look into curve just can the technical parameter such as the exciting current of Design of Transformer and open circuit loss accurately, and with the reality of transformator
Operational factor closely, has accomplished quantitative design.
Test circuit and method under transformer DC magnetic bias effect of the present utility model provide the benefit that: operation letter
Single, practical, with a high credibility, solve transformator be designed without stalloy in Direct Current Bias under iron losses curve and
An exciting power curve difficult problem, to Exact Design and testing transformer, technical parameter under different Direct Current Bias has the heaviest
The meaning wanted, beneficially use in 500kV-1000kV self coupling power transformer and HVDC transmission system ± 200kV-
Apply on ± 800kV converter power transformer.
Claims (4)
1. the test circuit under transformer DC magnetic bias effect, including the first tested transformator (1) and the second tested transformation
Device (2), it is characterised in that: the low pressure winding of described first tested transformator (1) and the low pressure winding of the second tested transformator (2)
Being connected in parallel and be followed by intermediate transformer (3), two high pressure winding line ends link together, the high pressure of the first tested transformator (1)
Neutral point links together with the neutral point of the second tested transformator (2) after penetrating controllable direct current power supply circuit.
Test circuit under transformer DC magnetic bias effect the most according to claim 1, it is characterised in that: described controlled directly
Stream power circuit is in parallel with standard capacitor (7) again after being pacified times table (6) series connection by adjustable resistance (4), DC source (5) and direct current
Constitute.
Test circuit under transformer DC magnetic bias effect the most according to claim 1, it is characterised in that: described first quilt
Examination transformator (1) and the second tested transformator (2) are two completely identical in structure single-phase transformers.
Test circuit under transformer DC magnetic bias effect the most according to claim 1, it is characterised in that: become in the middle of described
Depressor (3) connects generator alternating current power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620477493.2U CN205786940U (en) | 2016-05-24 | 2016-05-24 | A kind of test circuit under transformer DC magnetic bias effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620477493.2U CN205786940U (en) | 2016-05-24 | 2016-05-24 | A kind of test circuit under transformer DC magnetic bias effect |
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| CN205786940U true CN205786940U (en) | 2016-12-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019050A (en) * | 2016-05-24 | 2016-10-12 | 山东达驰电气有限公司 | Test circuit and method under DC bias effect of transformers |
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2016
- 2016-05-24 CN CN201620477493.2U patent/CN205786940U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019050A (en) * | 2016-05-24 | 2016-10-12 | 山东达驰电气有限公司 | Test circuit and method under DC bias effect of transformers |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20200806 Granted publication date: 20161207 |
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| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20200821 Granted publication date: 20161207 |