CN107181245A - A kind of single-phase saturable core type fault current limiter - Google Patents
A kind of single-phase saturable core type fault current limiter Download PDFInfo
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- CN107181245A CN107181245A CN201710338887.9A CN201710338887A CN107181245A CN 107181245 A CN107181245 A CN 107181245A CN 201710338887 A CN201710338887 A CN 201710338887A CN 107181245 A CN107181245 A CN 107181245A
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- iron core
- coil windings
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- current limiter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of single-phase saturable core type fault current limiter, including port type iron core, one group of AC coil winding and two groups of DC coil windings；Wherein, two groups of DC coil windings are wound on the relative both sides iron core of port type iron core respectively, and two groups of direct current windings are accessed in DC excitation circuit in differential concatenation mode；The AC coil winding is wrapped on the outside of two groups of DC coil windings, and AC coil windings in series is between AC power and system load；Two groups of DC coil windings use differential concatenation connection, and the number of turn is identical.The present invention is simple in construction, occupies little space, stability and high efficiency can effectively limit short-circuit current, while reducing demand of the magnetic saturation switching mode reactor to DC excitation electric current, use cost is saved, with good economical and practical value.
Description
Technical field
The present invention relates to a kind of single-phase saturable core type fault current limiter, belong to field of power.
Background technology
Increasingly increase with people to electricity needs, the load of power system is constantly aggravated, and short trouble occurs for power network
When capacity of short circuit also more and more higher, therefore it is also increasingly severe to cause harm to power equipment etc., therefore to short trouble
The research of current limiter is also more and more important.
Magnetic saturation switching mode reactor is exactly one kind in a variety of reactors, in system worked well, because direct current is encouraged
The excitation effect of magnetic circuit, magnetic saturation switching mode reactor reaches magnetic saturation state, and now reactor is rendered as Low ESR, to electricity
The normal influence on system operation of Force system is very low；And when short trouble occurs for system, because the short circuit current flow uprushed of AC is same
The DC excitation of script is offseted so that magnetic saturation switching mode reactor exits magnetic saturation state, is rendered as high-impedance state, so as to reach
To the effect of limitation short-circuit current.
Small, the advantages of failure reacts fast when occurring is lost in traditional magnetic saturation switching mode reactor when having normal work,
But operational efficiency is low simultaneously, iron core service efficiency only has 50%, and the problems such as DC excitation current needs are big during normal work is all
Cause traditional magnetic saturation switching mode reactor can not adapt to actual motion state at this stage.In recent years, for these problems,
Various countries expert proposes many new magnetic saturation switching mode reactors, and core of reactor is reduced by the way of open loop iron core
Use, reduce core loss, but simultaneously as the demand of DC excitation electric current is increased when open loop approach causes normal work
Greatly, the design difficulty of DC excitation power is not only increased, while superconducting coil must be used to reach required current-carrying capacity.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of single-phase saturable core type event
Hinder current limiter, with it is simple in construction, occupy little space, stability and high efficiency the features such as, can effectively limit short-circuit current, simultaneously
Demand of the magnetic saturation switching mode reactor to DC excitation electric current is reduced, use cost is saved, it is economical and practical.
Technical scheme：To achieve the above object, the technical solution adopted by the present invention is：
A kind of single-phase saturable core type fault current limiter, including port type iron core, one group of AC coil winding and two groups are straight
Flow coil windings；
Wherein, two groups of DC coil windings are wound on the relative both sides iron core of port type iron core respectively, and two groups of direct currents
Winding is accessed in DC excitation circuit in differential concatenation mode；The AC coil winding is wrapped in outside two groups of DC coil windings
Side, and AC coil windings in series is between AC power and system load.
It is attached by using two groups of direct-flow magnet exciting coil differential concatenation modes, the DC magnetic that two groups of DC coils are produced
Lead to and loop is formed in port type iron core, so that under the conditions of identical DC excitation, the saturable core type event in the present invention
Barrier current limiter is easier to enter saturation state.
Further, the number of turn of two groups of DC coil windings is identical.Because two DC excitation windings are using reverse
Tandem-type connection, the number of turn is identical, therefore, and the harmonic wave that DC excitation is produced in AC coil is also cancelled, so as to reduce power damage
Consumption.
Further, the AC coil winding and DC coil winding are made of silk bag flat type copper wire, and hollow iron
Core is made of silicon steel sheet, and cost is relatively low and magnetic conduction ability is strong.
Further, the section of the port type iron core is circular, ellipse or rectangle.
Beneficial effect：A kind of single-phase saturable core type fault current limiter that the present invention is provided, relative to prior art, has
Advantages below：1st, as traditional single-phase magnetic switch type fault current limiter, when the systems are operating normally, current limiter is rendered as low
Impedance state, can be rendered as high impedance, the size of effective limiting short-circuit current rapidly when short trouble occurs in system；
2nd, compared to traditional single-phase magnetic switch type fault current limiter, structure proposed by the present invention can largely subtract
Core material required for few current limiter, reduces the manufacturing cost of reactor, while core loss when reducing actual motion, is carried
The high operational efficiency of reactor；
3rd, under the conditions of identical DC excitation, the saturable core type fault current limiter in the present invention is easier to enter saturation
State, therefore in system worked well, the present invention can reduce the design difficulty of DC excitation system, and DC excitation line
The manufacture difficulty of circle.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the embodiment of the present invention；
Fig. 2 is the structural representation of the embodiment of the present invention；
Magnetic strengths of the Fig. 3 for the present invention with traditional magnetic saturation switching mode reactor under the conditions of 0~100A of DC excitation electric current
Answer intensity；
Fig. 4 is the present invention and traditional magnetic saturation switching mode reactor when short trouble occurs and exciting current size is 0
Current limitation effect compare figure；
Figure includes：1-port type iron core, 2,4-DC coil winding, 3-AC coil winding.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
It is as shown in Figure 1, 2 a kind of single-phase saturable core type fault current limiter, including port type iron core 1, one group of AC line
Enclose winding 3 and two groups of DC coil windings 2,4；
Wherein, two groups of DC coil windings 2,4 are wound on the relative both sides iron core of port type iron core 1 respectively, and two groups
Direct current winding 2,4 is accessed between switch S2, DC excitation power DC and resistance R2 in differential concatenation mode, is constituted DC excitation and is returned
Road；The AC coil winding 3 is wound in two groups of outsides of DC coil winding 2,4 simultaneously, and AC coil winding 1 is connected on friendship
Flow between power supply AC, line impedance R1, switch S1 and load RL, constitute ac circuit.
In the present embodiment, the number of turn of two groups of DC coil windings 2,4 is identical, and differential concatenation；The AC coil
Winding 3 and DC coil winding 2,4 are made of silk bag flat type copper wire, and port type iron core 1 is made of DQ120-30 silicon steel sheets.
In the present invention, the section of the port type iron core can using circular, ellipse or rectangle, and the sectional area of iron core,
Gas length of coil turn and iron core etc. is determined by the capacity of short trouble and the reactance value of required reactor.
The operation principle of the present invention is as follows：
In system worked well, DC excitation circuit charges to reactor, and now the two of iron core 1 core limb is all
Saturation state is reached, now Low ESR is presented in iron core 1, for the influence very little of whole system；When switching S3 closures, equivalent to
System there occurs short trouble, now, because the alternating current in AC coil increases suddenly, exchange positive half cycle, iron core 1 is left
Increase alternating current magnetic linkage in the core limb of side and DC excitation electric current magnetic linkage is offset, it is impossible to so that iron core enters saturation state,
And exchange magnetic linkage and direct current magnetic linkage are superimposed in the core limb on the right side of iron core 1, saturation state is remained as, reactor now is overall
High impedance status is rendered as, so as to limit the short circuit current flow of increase.Increase in exchange negative half period, the core limb on the right side of iron core 1
Alternating current magnetic linkage and DC excitation electric current magnetic linkage are offset, it is impossible to so that iron core enters saturation state, and the iron core in the left side of iron core 1
Post exchanges magnetic linkage and direct current magnetic linkage is superimposed, remains as saturation state, reactor now is integrally rendered as high impedance status, according to
Secondary alternating, so as to realize the restriction effect to short circuit current flow electric current.
Current limitation effect of the present invention in short trouble is verified below by finite element emulation software, while and passing
DC excitation effect of the magnetic saturation switching mode reactor in normal operating conditions of uniting is compared.
It is illustrated in figure 3 under the conditions of DC excitation is 0~100A, the comparison curves of magnetic induction intensity in correspondence iron core,
Wherein solid line is iron of the new magnetic saturation switching mode reactor (structure proposed by the present invention) under the conditions of 0~100A exciting currents
Core degree of saturation curve, and dotted line is core sataration of traditional saturation switching mode reactor under the conditions of 0~100A exciting currents
Degree curve.From the figure not difficult to find, under the conditions of the DC excitation of very little, new magnetic saturation switching mode reactor has been able to
Saturation is reached, but traditional magnetic saturation switching mode reactor is still extremely difficult to saturation when exciting current reaches 100A, by
This is visible, and new magnetic saturation switching mode reactor can be greatly reduced directly compared to traditional magnetic saturation switching mode reactor
The demand of exciting current is flowed, the design difficulty of DC excitation part is reduced.
If Fig. 4 is that current limitation effect both when failure occurs and exciting current size is 0 compares, dotted line is does not install electricity additional
When occurring short trouble during anti-device, the short-circuit current curve flowed through in system, solid line is to install new magnetic saturation switching mode additional
Line current curve during reactor, the solid line with round dot is bent for line current when installing traditional magnetic saturation switching mode reactor additional
Line, is not difficult to find out by Fig. 4, when installing the present invention and conventional reactor additional, and the current limitation effect having is close, and the present invention is in solution
Needed for saturation state of having determined while DC current problems of too, the current limitation effect of traditional saturable reactor originally is also remained with.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of single-phase saturable core type fault current limiter, it is characterised in that including port type iron core, one group of AC coil winding
With two groups of DC coil windings；
Wherein, two groups of DC coil windings are wound on the relative both sides iron core of port type iron core respectively, and two groups of direct current windings
Accessed in differential concatenation mode in DC excitation circuit；The AC coil winding technique on the outside of two groups of DC coil windings,
And AC coil windings in series is in single phase alternating current circuit.
2. a kind of single-phase saturable core type fault current limiter according to claim 1, it is characterised in that two groups of direct currents
The number of turn of coil windings is identical.
3. a kind of single-phase saturable core type fault current limiter according to claim 1, it is characterised in that the AC coil
Winding and DC coil winding are made of silk bag flat type copper wire, and port type iron core is made of silicon steel sheet.
4. a kind of single-phase saturable core type fault current limiter according to claim 1, it is characterised in that the hollow iron
The section of core is circular, ellipse or rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710338887.9A CN107181245A (en) | 2017-05-15 | 2017-05-15 | A kind of single-phase saturable core type fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710338887.9A CN107181245A (en) | 2017-05-15 | 2017-05-15 | A kind of single-phase saturable core type fault current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107181245A true CN107181245A (en) | 2017-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710338887.9A Pending CN107181245A (en) | 2017-05-15 | 2017-05-15 | A kind of single-phase saturable core type fault current limiter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647264A (en) * | 2013-12-19 | 2014-03-19 | 特变电工沈阳变压器集团有限公司 | Strong coupled type power failure current limiter |
| CN104836216A (en) * | 2015-05-29 | 2015-08-12 | 东南大学 | Saturated iron core type fault current limiter |
| CN206992686U (en) * | 2017-05-15 | 2018-02-09 | 东南大学 | A kind of single-phase saturable core type fault current limiter |
-
2017
- 2017-05-15 CN CN201710338887.9A patent/CN107181245A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647264A (en) * | 2013-12-19 | 2014-03-19 | 特变电工沈阳变压器集团有限公司 | Strong coupled type power failure current limiter |
| CN104836216A (en) * | 2015-05-29 | 2015-08-12 | 东南大学 | Saturated iron core type fault current limiter |
| CN206992686U (en) * | 2017-05-15 | 2018-02-09 | 东南大学 | A kind of single-phase saturable core type fault current limiter |
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Application publication date: 20170919 |
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| RJ01 | Rejection of invention patent application after publication |