CN208623323U - A kind of inrush current of transformer limiter and shipping shore power system for ship shore electric - Google Patents
A kind of inrush current of transformer limiter and shipping shore power system for ship shore electric Download PDFInfo
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- CN208623323U CN208623323U CN201821162148.5U CN201821162148U CN208623323U CN 208623323 U CN208623323 U CN 208623323U CN 201821162148 U CN201821162148 U CN 201821162148U CN 208623323 U CN208623323 U CN 208623323U
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- 230000005611 electricity Effects 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims description 7
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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Abstract
The utility model discloses a kind of inrush current of transformer limiters for ship shore electric, including iron core and three-phase coil, three-phase coil is wound on iron core, and the magnetic circuit mutual conduction generated, the flow direction that three-phase coil generates is identical, the input terminal of three-phase coil is separately connected the three-phase output end of bank electricity system frequency converter, and the output end of three-phase coil is separately connected the three-phase input end of ship transformer.The shipping shore power system including the inrush current of transformer limiter is also disclosed simultaneously.Excitation surge current caused by when the utility model can quickly and effectively inhibit transformer during no-load closing, can opposite bank electric system unsymmetrical short-circuit electric current have inhibiting effect, avoid short circuit current is excessive valve side is caused to be latched.
Description
Technical field
The utility model relates to a kind of inrush current of transformer limiters and shipping shore power system for ship shore electric, belong to electricity
Work technical field.
Background technique
Ship to, reach port during using oil-fired power generating subsidiary engine to load power, can generate great amount of fuel oil exhaust gas discharge, give
More serious air, water pollution problem are brought in harbour, and the pressure of environmental protection and sustainable development is larger.Bank electricity system refers to
Ship to port, reach port during substitution ship power generation subsidiary engine electric energy feed system, provide ship during port its pump group, ventilation,
Electric power needed for other loads such as illumination, communication.Ship reaches port to be energized using bank electricity, to reduction Regional Environmental Pollution, is reduced and is leaned on
Port ship energy cost and raising efficiency of energy utilization are of great significance, and are one of the effective ways of harbour energy-saving and emission-reduction.Mesh
Preceding abyssopelagic large ship mostly uses greatly the electricity system of 60Hz, therefore such ship is needed when stopping domestic harbour using bank electricity
50Hz electricity is converted by 60Hz electricity using frequency converter.During connection between ship and bank, it will appear when transformer during no-load closing on ship
Excitation surge current phenomenon, amplitude of shoving can reach several times to more than ten times of transformer rated current, the remote super-frequency-conversion device valve of size of current
The maximum current capacity of group, seriously affects bank electricity safe and stable operation.
Utility model content
The utility model provides a kind of inrush current of transformer limiter and shipping shore power system for ship shore electric, effectively
Excitation surge current caused by when inhibition transformer during no-load closing.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the utility model is
A kind of inrush current of transformer limiter for ship shore electric, including iron core and three-phase coil, three-phase coil are wound on iron
On core, and the magnetic circuit mutual conduction generated, the flow direction that three-phase coil generates is identical, and the input terminal of three-phase coil connects respectively
The three-phase output end of bank electricity system frequency converter is connect, the output end of three-phase coil is separately connected the three-phase input end of ship transformer.
Three-phase coil is wound on iron core by the same direction.
The number of turns of three-phase coil is identical.
The inrush current of transformer limiter, when not having excitation surge current, the sum of three-phase current vector is zero.
The inrush current of transformer limiter, when not having excitation surge current, iron core works in unsaturation linear zone.
The inrush current of transformer limiter, when not having excitation surge current, each phase coil reactance is less than threshold value A 1.
The inrush current of transformer limiter, when generating excitation surge current, the sum of three-phase current vector is not zero.
The inrush current of transformer limiter, when generating excitation surge current, each phase coil reactance is greater than threshold value B1.
The inrush current of transformer limiter is mounted on frequency converter side.
A kind of shipping shore power system, including frequency converter further include the inrush current of transformer limiter, inrush current of transformer limit
The three-phase output end connection ship of the three-phase output end of the three-phase input end connection frequency converter of device processed, inrush current of transformer limiter becomes
The three-phase input end of depressor.
The utility model it is achieved the utility model has the advantages that 1, when generating excitation surge current, for transformer, each phase magnetic circuit it is full
Different with the time, the sum of the current phasor on each route is not zero, and the sum of current phasor on the utility model three-phase coil is no
Be zero, each phase coil reactance is very big, when can quickly and effectively inhibit transformer during no-load closing caused by excitation surge current, can be right
Bank electricity system unsymmetrical short-circuit electric current has inhibiting effect, avoids short circuit current is excessive valve side is caused to be latched；2, the utility model exists
When not having excitation surge current, the sum of three-phase current vector is zero, and iron core works in unsaturation linear zone, each phase coil reactance very little,
Guarantee does not influence system operation when being serially accessed to the circuit；3, the utility model running wastage is low, fast response time, without additional measurement
Surge suppression can be realized in transformer during no-load closing moment in equipment.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of inrush current of transformer limiter；
Fig. 2 is the structure chart that inrush current of transformer limiter accesses existing system；
Fig. 3 is not use and use inrush current of transformer limiter, and three phase excitation is shoved comparison diagram when transformer during no-load closing.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating this
The technical solution of utility model, and cannot be used as a limitation the limitation protection scope of the utility model.
A kind of inrush current of transformer limiter for ship shore electric, including iron core and three-phase coil, three-phase coil are wound on iron
On core, and the magnetic circuit mutual conduction generated, three-phase coil are wound on iron core by the same direction, and the number of turns of three-phase coil is identical,
The flow direction that three-phase coil generates is identical.
Specific structure is as shown in Figure 1, the iron of other structures can also be used using common annulus shaped iron core in iron core certainly
Core, such as rectangle iron core, as long as guaranteeing the magnetic circuit mutual conduction generated；Three-phase coil (A, B, C phase i.e. in figure) presses phase
Equidirectional and identical the number of turns is wound on iron core.
As shown in Fig. 2, above-mentioned inrush current of transformer limiter is when in use, it is directly accessed bank electricity system frequency converter and ship becomes
Between depressor, the inrush current of transformer limiter is mounted on frequency converter side, i.e. the input terminal of three-phase coil is separately connected bank electricity system
The three-phase output end of system frequency converter, the output end of three-phase coil are separately connected the three-phase input end of ship transformer.
A, B, C phase real-time impedance Za、Zb、ZcIt can indicate are as follows:
In formula, Zoa、Zob、ZocAnd Zma、Zmb、ZmcRespectively A, B, C three-phase leakage inductance and mutual inductance, NA、NB、NCRespectively three-phase
Coil turn, f are frequency, and l is the length of magnetic path, and μ is magnetic conductivity, Ia、Ib、IcFor three-phase current, j represents reactance value.
When inrush current of transformer limiter operates normally (i.e. no excitation surge current), the sum of three-phase current vector is zero, i.e. Ia+
Ib+Ic=0, three-phase mutual inductance is zero, and leakage inductance can be the filter inductance of frequency converter net side by adjusting air-gap design, and iron core work exists
Unsaturation linear zone, each phase coil reactance are less than threshold value A 1, which is the value of very little, that is to say, that each phase coil reactance is very
Small, guarantee does not influence system operation when being serially accessed to the circuit.
Assuming that transformer terminal voltage u is indicated when transformer during no-load closing are as follows:
U=Umsin(ωt+α)
Wherein, UmFor voltage magnitude；ω is angular speed；α is voltage initial angle.
Then excitation surge current may be expressed as:
Wherein, R1、L1The resistance and inductance of indication transformer primary circuit；Rs、LsExpression system equivalent internal resistance and interior electricity
Sense；L ' indication transformer magnetizing inductance, magnetizing inductance is related with saturation of magnetic path, and magnetizing inductance is very big when magnetic circuit is saturated, magnetic
Magnetizing inductance very little when the unsaturation of road；C is constant, size and combined floodgate transient voltage
Phase angle is related,It without physical meaning, is indicated simplifying for i (t) expression formula intermediate cam function.
It can be seen that shove from excitation surge current i (t) expression formula and be made of decaying DC component and AC compounent, direct current point
The rate of decay of amount and the size of AC compounent are all related with saturation of magnetic path, and for three-phase transformer, each phase magnetic circuit is satisfied
Different with the time, the sum of the current phasor on each route is not zero, i.e., the sum of the current phasor on three-phase coil is not zero, Ia+Ib
+Ic≠ 0, each phase coil reactance is greater than threshold value B1, and threshold value B1 is very big value, that is to say, that and each phase coil reactance is very big, because
Excitation surge current caused by when transformer inrush current limiting device can quickly and effectively inhibit transformer during no-load closing when this this, additionally it is possible to
Opposite bank electric system unsymmetrical short-circuit electric current has inhibiting effect, avoids short circuit current is excessive valve side is caused to be latched, while running wastage
Low, surge suppression can be realized in transformer during no-load closing moment without additional measuring device in fast response time.
In order to further verify the effect of above-mentioned inrush current of transformer limiter, l-G simulation test is compared, simulation result is such as
Shown in Fig. 3.
From figure 3, it can be seen that when transformer during no-load closing, transformer A, B, C three phase excitation is shoved maximum amplitude difference
For 80A, 40A, 40A, when using above-mentioned inrush current of transformer limiter, transformer A, B, C three phase excitation is shoved maximum amplitude difference
For 45A, 20A, 22A.As it can be seen that above-mentioned inrush current of transformer limiter can effectively inhibit the excitation generated when transformer during no-load closing
It shoves.
A kind of shipping shore power system, including frequency converter and above-mentioned inrush current of transformer limiter, inrush current of transformer limiter
Three-phase input end connection frequency converter three-phase output end, the three-phase output end of inrush current of transformer limiter connects ship transformer
Three-phase input end.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change
It also should be regarded as the protection scope of the utility model into deformation.
Claims (10)
1. a kind of inrush current of transformer limiter for ship shore electric, it is characterised in that: including iron core and three-phase coil, triple line
Circle is wound on iron core, and the magnetic circuit mutual conduction generated, and the flow direction that three-phase coil generates is identical, the input of three-phase coil
End is separately connected the three-phase output end of bank electricity system frequency converter, and the output end of three-phase coil is separately connected the three-phase of ship transformer
Input terminal.
2. a kind of inrush current of transformer limiter for ship shore electric according to claim 1, it is characterised in that: triple line
Circle is wound on iron core by the same direction.
3. a kind of inrush current of transformer limiter for ship shore electric according to claim 1, it is characterised in that: triple line
The number of turns of circle is identical.
4. a kind of inrush current of transformer limiter for ship shore electric according to claim 1, it is characterised in that: the change
Depressor inrush current limiting device, when not having excitation surge current, the sum of three-phase current vector is zero.
5. a kind of inrush current of transformer limiter for ship shore electric according to claim 1, it is characterised in that: the change
Depressor inrush current limiting device, when not having excitation surge current, iron core works in unsaturation linear zone.
6. a kind of inrush current of transformer limiter for ship shore electric according to claim 1, it is characterised in that: the change
Depressor inrush current limiting device, when not having excitation surge current, each phase coil reactance is less than threshold value A 1.
7. a kind of inrush current of transformer limiter for ship shore electric according to claim 1, it is characterised in that: the change
Depressor inrush current limiting device, when generating excitation surge current, the sum of three-phase current vector is not zero.
8. a kind of inrush current of transformer limiter for ship shore electric according to claim 1, it is characterised in that: the change
Depressor inrush current limiting device, when generating excitation surge current, each phase coil reactance is greater than threshold value B1.
9. a kind of inrush current of transformer limiter for ship shore electric according to claim 1, it is characterised in that: the change
Depressor inrush current limiting device is mounted on frequency converter side.
10. a kind of shipping shore power system, including frequency converter, it is characterised in that: further include described in claim 1 ~ 9 any one
Inrush current of transformer limiter, the three-phase output end of the three-phase input end connection frequency converter of inrush current of transformer limiter, transformer gush
Flow the three-phase input end of the three-phase output end connection ship transformer of limiter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821162148.5U CN208623323U (en) | 2018-07-20 | 2018-07-20 | A kind of inrush current of transformer limiter and shipping shore power system for ship shore electric |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821162148.5U CN208623323U (en) | 2018-07-20 | 2018-07-20 | A kind of inrush current of transformer limiter and shipping shore power system for ship shore electric |
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| Publication Number | Publication Date |
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| CN208623323U true CN208623323U (en) | 2019-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767827A (en) * | 2018-07-20 | 2018-11-06 | 国电南瑞科技股份有限公司 | A kind of inrush current of transformer limiter and shipping shore power system for ship shore electric |
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2018
- 2018-07-20 CN CN201821162148.5U patent/CN208623323U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767827A (en) * | 2018-07-20 | 2018-11-06 | 国电南瑞科技股份有限公司 | A kind of inrush current of transformer limiter and shipping shore power system for ship shore electric |
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