CN204167890U - A kind of single-phase transformer inrush current suppression apparatus - Google Patents
A kind of single-phase transformer inrush current suppression apparatus Download PDFInfo
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- CN204167890U CN204167890U CN201420652285.2U CN201420652285U CN204167890U CN 204167890 U CN204167890 U CN 204167890U CN 201420652285 U CN201420652285 U CN 201420652285U CN 204167890 U CN204167890 U CN 204167890U
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- 230000001629 suppression Effects 0.000 title claims abstract description 12
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 230000000630 rising effect Effects 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000005284 excitation Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002889 sympathetic effect Effects 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
A kind of single-phase transformer inrush current suppression apparatus, comprise DC power supply (1), resistance (2), first push switch (3) and the second push switch (4), electric capacity (6), transformer (7), load (8), AC power (10), relay (9), relay drive circuit (15), voltage isolation sampler (11), photoelectrical coupler (12), and control circuit (13); Wherein DC power supply 1 is small-power power; Wherein voltage isolation sampler (11) is sampled to the ac signal that AC power (10) exports, voltage is isolated the voltage signal that sampler (11) gathers and is become positive half cycle square-wave signal by photoelectrical coupler (12), wherein defining rising edge is positive half cycle zero cross signal, and trailing edge is negative half period zero cross signal.
Description
Technical field
The utility model relates to a kind of device suppressing transformer excitation flow, belongs to power electronic device field.
Background technology
Transformer is the vitals in electric power system, and its operation of safety and stability to whole electric power system is most important.The transient current produced in its winding during the charging of transformer full voltage.When the flow direction that when residual flux before transformer drops in iron core drops into transformer, operating voltage produces is identical, its total magnetic flux is considerably beyond the saturation flux amount of iron core, therefore produce and shove greatly, wherein peak-peak can reach the 6-8 of transformer rated current doubly.The phase angle of system voltage when magnetizing inrush current drops into transformer, the residual flux of transformer core and power-supply system factor such as ground impedance etc. and change, if do not have remanent magnetism, peak inrush current to appear at when transformer drops into voltage through zero crossing moment (this time magnetic flux be peak value).Containing DC component and higher harmonic components in inrush current of transformer, decay in time, its die-away time depends on loop resistance and reactance, and general high-power transformer is about 5-10 second, and small capacity transformer is about about 0.2 second.
When charging to transformer; alternating flux is produced in iron core; this alternating flux is called iron core excitation from zero to maximum; core sataration will produce overcurrent; we are called transformer excitation flow the electric current that this process produces; this electric current is higher than the rated current of transformer, all will adjust for escaping magnetizing inrush current from the mechanical force of transformer, electric power to protection seting.Magnetizing inrush current bring harmfulness comprise: cause the protective relaying device malfunction of transformer, make the failure again and again that puts into operation of transformer; The voltage spikes produced when transformer occurs that short trouble excises, brings out malfunction for tranformer protection, and transformer each side load is all had a power failure; The magnetizing inrush current that one, power station no-load transformer access power supply produces, brings out transformer generation " sympathetic inrush " (sympathetic inrush) and mistrip of running in other power stations contiguous etc., causes large-area power-cuts; The magnetizing inrush current that numerical value is very large can cause transformer and circuit breaker because of electric power excessive impaired; Bring out switching overvoltage, damage electric equipment; DC component in magnetizing inrush current causes current transformer magnetic circuit significantly to be reduced the performance factor of certainty of measurement and protective relaying device by excessively magnetizing; A large amount of harmonic waves in magnetizing inrush current cause serious pollution to the electrical network quality of power supply.Cause line voltage to rise sharply or rapid drawdown, affect other electric equipments and normally work.
Fig. 1 shows the supply network comprising transformer of the prior art, and wherein A represents mains supply, and B represents circuit breaker, and C indication transformer, D represents load.This supply network is when starting to power on, there will be magnetic core of transformer saturated phenomenon, the elementary of transformer can be caused to flow through very large magnetizing inrush current, circuit breaker can be caused like this to throw off, and the mechanical switch at combined floodgate place can be caused to strike sparks, so, phenomenon is thrown off through having repeatedly to close a floodgate, infringement can be brought like this to circuit components, in order to solve this problem, existing technology proposes a kind of floating voltage phase place and eliminates magnetizing inrush current from sinusoidal wave an angle of 90 degrees degree combined floodgate, but, this technology also also exists certain defect, be specially: if do not know the moment of power-off last time, the remanence direction in magnetic field in transformer will be determined, which cannot judge angle to close a floodgate most suitable from.And in this case, also may produce magnetizing inrush current from an angle of 90 degrees degree combined floodgate.
Utility model content
The utility model is for problem above, propose a kind of device of suppression transformer excitation flow newly, it is without the need to judging phase angle during power-off last time, adopt a kind of simple capacitive discharge unit, transformer magnetic field is offset to a Direction saturation, thus artificial given remanence direction, and then after selecting zero crossing, 1-3ms trigger relay just can eliminate magnetizing inrush current.
The utility model provides a kind of single-phase transformer inrush current suppression apparatus, comprise DC power supply (1), resistance (2), first push switch (3) and the second push switch (4), electric capacity (6), transformer (7), load (8), AC power (10), relay (9), relay drive circuit (15), voltage isolation sampler (11), photoelectrical coupler (12), and control circuit (13); it is characterized in that: one end of a contact resistance (2) in two outputs of DC power supply (1), other one end of resistance (2) connects one end of the first push switch (3), other one end of first push switch (3) is connected to one end of electric capacity (6) and one end of the second push switch (4) respectively, one end of the primary coil of transformer (7) is connected to the one end in two switch terminals of the other one end of the second push switch (4) and relay (9) respectively, other one end of the primary coil of transformer (7) is connected to the another one in two outputs of DC power supply (1) respectively, other one end of electric capacity (6) and one end of AC power (10), two outputs of the secondary coil of transformer (7) connect load (8), the other end in two switch terminals of relay (9) is connected to the other end of AC power (10), simultaneously, two outputs of AC power (10) are also connected to two inputs of voltage isolation sampler (11), two outputs of voltage isolation sampler (11) are connected to two inputs of photoelectrical coupler (12), the output connection control circuit (13) of photoelectrical coupler (12), the output of control circuit (13) is connected to the control end of relay (9) by relay drive circuit (15), wherein DC power supply 1 is small-power power, wherein voltage isolation sampler (11) is sampled to the ac signal that AC power (10) exports, voltage is isolated the voltage signal that sampler (11) gathers and is become positive half cycle square-wave signal by photoelectrical coupler (12), wherein defining rising edge is positive half cycle zero cross signal, trailing edge is negative half period zero cross signal, control circuit (13) gathers square-wave signal, pass through the control end of relay drive circuit (15) trigger relay after selecting negative half period zero crossing after 1-3ms, AC power (10) can be connected on transformer (7).
According to an embodiment of the present utility model, the power of described DC power supply (1) is less than or equal to 10W.
According to an other embodiment of the present utility model, the operating current of described photoelectrical coupler (12) connects supply voltage positive pole by collector electrode, and emitter is realized by the second resistance (14) ground connection coming.
Accompanying drawing explanation
Fig. 1 is the distribution network schematic diagram including transformer of the prior art;
Fig. 2 is the structural representation of single-phase transformer inrush current suppression apparatus of the present utility model;
Fig. 3 shows the square-wave signal of the positive half cycle that photoelectrical coupler of the present utility model gathers;
Embodiment
On basis by reference to the accompanying drawings, content of the present utility model is further described in more detail below.
Fig. 1 illustrates the supply network including transformer of the prior art in schematic form; comprising mains supply A; mains supply A is connected by the primary coil of wire with transformer C; circuit breaker B is provided with between mains supply A and transformer C; go out to protect for supply network now for taking notice of, load D is connected by the secondary coil of wire with transformer C.For such supply network, just as mentioned in the background art, this supply network is when starting to power on, there will be magnetic core of transformer saturated phenomenon, the elementary of transformer can be caused to flow through very large magnetizing inrush current, circuit breaker can be caused like this to throw off, and the mechanical switch at combined floodgate place can be caused to strike sparks, so, phenomenon is thrown off through having repeatedly to close a floodgate, infringement can be brought like this to circuit components, in order to solve this problem, existing technology proposes a kind of floating voltage phase place and eliminates magnetizing inrush current from sinusoidal wave an angle of 90 degrees degree combined floodgate, but, this technology also also exists certain defect, be specially: if do not know the moment of power-off last time, the remanence direction in magnetic field in transformer will be determined, which cannot judge angle to close a floodgate most suitable from.And in this case, also may produce magnetizing inrush current from an angle of 90 degrees degree combined floodgate.In order to solve these technical problems, the utility model spy proposes a kind of device of novel suppression transformer excitation flow, is described in detail below on the basis of composition graphs 2 and Fig. 3 to the embodiment of this practicality.
As shown in Figure 2, single-phase transformer inrush current suppression apparatus of the present utility model comprises a DC power supply 1, two resistance 2 and 14, two push switches 3 and 4,7, the load 8 of an electric capacity 6, transformer, an AC power 10, a relay 9, relay drive circuit 15, voltage isolation sampler 11, a photoelectrical coupler 12, and a control circuit 13, one in two outputs of wherein DC power supply 1 one end connecting the first resistance 2, other one end of first resistance 2 connects one end of the first push switch 3, other one end of first push switch 3 is connected to one end of electric capacity 6 and one end of the second push switch 4 respectively, one end of the primary coil of transformer 7 is connected to the one end in other one end of the second push switch 4 and two switch terminals of relay 9 respectively, other one end of the primary coil of transformer 7 is connected to the another one in two outputs of DC power supply 1 respectively, other one end of electric capacity 6 and one end of AC power 10, two outputs of the secondary coil of transformer 7 connect load 8, the other end in two switch terminals of relay is connected to the other end of AC power 10, simultaneously, two outputs of AC power 10 are connected to two inputs of voltage isolation sampler 11, two outputs of voltage isolation sampler 11 are connected to two inputs of photoelectrical coupler 12, the output connection control circuit 13 of photoelectrical coupler, the output of control circuit 13 is connected to the control end of relay 9 by relay drive circuit 15, wherein DC power supply 1 is small-power power, its power is less than 10W, wherein photoelectrical coupler 12 operating current connects supply voltage positive pole by collector electrode, emitter is realized by the second resistance 14 ground connection coming, this belongs to technology well known in the art, no longer repeat at this.
Describe operation principle and the process of the utility model transformer inrush current suppression apparatus below in detail.During work, first closed push switch 3, DC power supply 1 charges to electric capacity 6 by resistance 2, charging terminates rear disconnection push switch 3, then closed push switch 4, and electric capacity 6 is to the elementary electric discharge of transformer 7, the electricity that electric capacity 6 stores is enough to make transformer 7 saturated, because DC power supply 1 is small-power power, small-power power within 10w, simple and convenient.Push switch 3 disconnects, closed push switch 4, electric capacity 6 is only the process of a capacitor discharge to the process of transformer discharge, energy is very little, safe and reliable, push switch 4 is disconnected after transformer 7 is saturated, remanent magnetism is known, at this moment the phase angle that line voltage (being also AC power 10) is closed can just be selected, from 1-3ms after negative half period zero crossing, the mains voltage signal now gathered by voltage isolation sampler 11 becomes positive half cycle square-wave signal through photoelectrical coupler 12, wherein defining rising edge is positive half cycle zero cross signal, trailing edge is negative half period zero cross signal, control circuit 13 gathers square-wave signal, after selecting negative half period zero crossing, 1-3ms passes through the control end of relay drive circuit 15 trigger relay, civil power can be received on transformer 7.During civil power access, transformer exits saturated process, can not produce magnetizing inrush current.Wherein gathered mains voltage signal is become the square-wave signal of positive half cycle as shown in Figure 3, also namely only retain the positive half-cycle signal of civil power sine wave, and become square-wave signal.
All illustrate with specific embodiment about the explanation being originally utility model above, but this can not as the restriction to the utility model protection range, the predictable reasonable distortion of those skilled in the art is all within protection range of the present utility model.
Claims (3)
1. a single-phase transformer inrush current suppression apparatus, comprise DC power supply (1), resistance (2), first push switch (3) and the second push switch (4), electric capacity (6), transformer (7), load (8), AC power (10), relay (9), relay drive circuit (15), voltage isolation sampler (11), photoelectrical coupler (12), and control circuit (13); it is characterized in that: one end of a contact resistance (2) in two outputs of DC power supply (1), other one end of resistance (2) connects one end of the first push switch (3), other one end of first push switch (3) is connected to one end of electric capacity (6) and one end of the second push switch (4) respectively, one end of the primary coil of transformer (7) is connected to the one end in two switch terminals of the other one end of the second push switch (4) and relay (9) respectively, other one end of the primary coil of transformer (7) is connected to the another one in two outputs of DC power supply (1) respectively, other one end of electric capacity (6) and one end of AC power (10), two outputs of the secondary coil of transformer (7) connect load (8), the other end in two switch terminals of relay (9) is connected to the other end of AC power (10), simultaneously, two outputs of AC power (10) are also connected to two inputs of voltage isolation sampler (11), two outputs of voltage isolation sampler (11) are connected to two inputs of photoelectrical coupler (12), the output connection control circuit (13) of photoelectrical coupler (12), the output of control circuit (13) is connected to the control end of relay (9) by relay drive circuit (15), wherein DC power supply 1 is small-power power, wherein voltage isolation sampler (11) is sampled to the ac signal that AC power (10) exports, voltage is isolated the voltage signal that sampler (11) gathers and is become positive half cycle square-wave signal by photoelectrical coupler (12), wherein defining rising edge is positive half cycle zero cross signal, trailing edge is negative half period zero cross signal, control circuit (13) gathers square-wave signal, pass through the control end of relay drive circuit (15) trigger relay after selecting negative half period zero crossing after 1-3ms, AC power (10) can be connected on transformer (7).
2. single-phase transformer inrush current suppression apparatus according to claim 1, is characterized in that: the power of described DC power supply (1) is less than or equal to 10W.
3. single-phase transformer inrush current suppression apparatus according to claim 1, it is characterized in that: the operating current of described photoelectrical coupler (12) connects supply voltage positive pole by collector electrode, and emitter is realized by the second resistance (14) ground connection coming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420652285.2U CN204167890U (en) | 2014-11-05 | 2014-11-05 | A kind of single-phase transformer inrush current suppression apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420652285.2U CN204167890U (en) | 2014-11-05 | 2014-11-05 | A kind of single-phase transformer inrush current suppression apparatus |
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| CN204167890U true CN204167890U (en) | 2015-02-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870897A (en) * | 2016-06-02 | 2016-08-17 | 国网山东省电力公司莱芜供电公司 | Inrush transient current suppression device based on three-phase-trip circuit breaker |
| CN113325345A (en) * | 2021-06-02 | 2021-08-31 | 云南电网有限责任公司电力科学研究院 | Device and method for testing residual magnetism of transformer core |
-
2014
- 2014-11-05 CN CN201420652285.2U patent/CN204167890U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870897A (en) * | 2016-06-02 | 2016-08-17 | 国网山东省电力公司莱芜供电公司 | Inrush transient current suppression device based on three-phase-trip circuit breaker |
| CN105870897B (en) * | 2016-06-02 | 2018-04-10 | 国网山东省电力公司莱芜供电公司 | A kind of inrush phenomenon restraining device for jumping breaker altogether based on three-phase |
| CN113325345A (en) * | 2021-06-02 | 2021-08-31 | 云南电网有限责任公司电力科学研究院 | Device and method for testing residual magnetism of transformer core |
| CN113325345B (en) * | 2021-06-02 | 2024-04-09 | 云南电网有限责任公司电力科学研究院 | Device and method for testing residual magnetism of transformer core |
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