CN204947951U - A kind of generator linear resistance and nonlinear resistance mixing demagnetization circuit - Google Patents
A kind of generator linear resistance and nonlinear resistance mixing demagnetization circuit Download PDFInfo
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- CN204947951U CN204947951U CN201520636989.5U CN201520636989U CN204947951U CN 204947951 U CN204947951 U CN 204947951U CN 201520636989 U CN201520636989 U CN 201520636989U CN 204947951 U CN204947951 U CN 204947951U
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Abstract
The utility model discloses a kind of generator linear resistance and nonlinear resistance mixing demagnetization circuit, relate to eliminating magnetism of generator technical field, be intended to make full use of linear resistance, nonlinear resistance advantage separately, improve reliability and the demagnetization speed of magnetism elimination circuit.The utility model comprises the first switch and demagnetization branch road; Described demagnetization branch road comprises second switch, linear resistance and nonlinear resistance.One end of described first switch is connected with the first output of thyristor rectifier bridge, and the other end of the first switch is connected with one end of load, one end of demagnetization branch road simultaneously; The other end of load, the other end of demagnetization branch road are connected with another output of thyristor rectifier bridge simultaneously.In demagnetization branch road, connect with second switch after linear resistance and nonlinear resistance parallel connection.Described second switch is used for turning off when the first switch conduction, conducting in certain hour when the first switch OFF or before the first switch OFF.
Description
Technical field
The utility model relates to eliminating magnetism of generator technical field, especially linear resistance and nonlinear resistance mixing demagnetization circuit.
Background technology
In synchronous generator excited system, excitation system Main Function is that alternating current is transformed into controlled direct current, the method of conversion generally adopts thyristor rectifier bridge, rectifier bridge be input as three-phase alternating-current supply voltage, export as pulsating dc voltage, be linked in Generator's Rotor Circuit by field suppression switch.Due to field suppression switch connection is inductive load, and inductive current cannot suddenly change, otherwise can respond to higher voltage, must provide field suppression equipment.When wherein the major function of field suppression equipment is generator emergency shutdown, disconnects DC power supply, connect magnetism elimination circuit rapidly, make the field supply of generator import on de-excitation resistance, the magnetic field energy of generator amature winding is consumed rapidly on de-excitation resistance.
In prior art, usually alone nonlinear resistance or alone linear resistance carry out demagnetization, and linear resistance can be electric resistance of stainless or cast iron resistance or ceramic wire-wound resistor, and described nonlinear resistance can be carborundum resistance or ZnO resistors.But all there are some problems when alone nonlinear resistance demagnetization and alone linear resistance demagnetization.During as used znr, when this resistance characteristic determines demagnetization, voltage is higher, higher to the arc voltage on field suppression switch, be easy to damage field suppression switch, when and for example using linear resistance demagnetization, when magnetism elimination circuit electric current is excessive, the voltage on linear resistance also can be very large, be easy to damage resistance, cause insulation fault.
Utility model content
Goal of the invention of the present utility model is: for above-mentioned Problems existing, a kind of linear resistance and nonlinear resistance mixing demagnetization circuit are provided, the resistance simultaneously giving two kinds of resistance matches well, to make full use of linear resistance, nonlinear resistance advantage separately, improve reliability and the demagnetization speed of magnetism elimination circuit.
The utility model comprises the first switch and demagnetization branch road; Described demagnetization branch road comprises second switch, linear resistance and nonlinear resistance.
One end of described first switch is connected with the first output of thyristor rectifier bridge, and the other end of the first switch is connected with one end of load, one end of demagnetization branch road simultaneously; The other end of load, the other end of demagnetization branch road are connected with another output of thyristor rectifier bridge simultaneously.
In demagnetization branch road, connect with second switch after linear resistance is in parallel with nonlinear resistance.
Described second switch is used for turning off when the first switch conduction, conducting in certain hour when the first switch OFF or before the first switch OFF.
Preferably, linear resistance be the 3-6 of excitation winding resistance doubly, nonlinear resistance individually by its resistance during rated exciting current be the 2-4 of excitation winding doubly.
Preferably, nonlinear resistance is being less than the 3-5 of rated excitation voltage doubly by its voltage during 3 times of rated exciting currents.
Preferably, described linear resistance is electric resistance of stainless or cast iron resistance or ceramic wire-wound resistor.
Preferably, described nonlinear resistance is carborundum resistance or ZnO resistors.
In sum, the beneficial effects of the utility model are:
The utility model provides the circuit structure of a kind of linear resistance and nonlinear resistance mixing demagnetization; give both resistance proportionings simultaneously; give full play to two kinds of resistance respective advantage when demagnetization; protect the components and parts in demagnetization circuit simultaneously, improve reliability and the demagnetization speed of demagnetization circuit.
Accompanying drawing explanation
Fig. 1 is the utility model circuit structure diagram;
Fig. 2 emulates to the demagnetization under generator nominal operating conditions the simulation result figure obtained;
Fig. 3 emulates to demagnetization under generator three-phase short-circuit of machine's port operating mode the simulation result figure obtained;
Fig. 4 misses the demagnetization of encouraging by force under operating mode to generator zero load to emulate the simulation result figure obtained.
Mark in figure:
1 is transformer; 2 is thyristor rectifier bridge; 3 is the first switch; 4 is load; 5 is second switch; 6 is total demagnetization energy; 7 is the demagnetization energy of linear resistance; 8 is the demagnetization energy of nonlinear resistance.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, transformer 1 exports three-phase alternating voltage, AC conversion is direct current by thyristor rectifier bridge 2, thyristor rectifier bridge 2 has two outputs, its first output is connected with one end of the first switch 3, the other end of the first switch 3 is connected with one end of load 4 and one end of second switch 5 simultaneously, the other end of second switch 5 is connected with one end of linear resistance R1, the other end of linear resistance R1, the other end of load 4 are connected with the second output of thyristor rectifier bridge 2 simultaneously, and nonlinear resistance R is in parallel with linear resistance R1.
Operation principle of the present utility model is, when the first switch 3 conducting, load obtains electric, when the first switch 3 disconnects, because load 4 is inductance, it has a large amount of induced field energy, need rapid demagnetization, therefore when the first switch disconnects, or second switch 5 needs conducting when the first switch is about to disconnect, and magnetic field energy absorbs by linear resistance R1 and nonlinear resistance R fast.
In the present embodiment, second switch 5 can be jumper, gathers the induced voltage in load, outputs on the trigger end of jumper by the induced voltage collected, and when induced voltage is greater than certain value, jumper is triggered conducting.Also control circuit can be used to produce control impuls, disconnect in front certain hour at the first switch 3, control circuit produces control impuls control second switch 5 and closes.
In other embodiments, first switch 3 and second switch 5 are two mechanical contacts of same circuit breaker, first switch 3 is normally opened contact, second switch 5 is normally-closed contact, and when the controlled coils of circuit breaker obtains electric, the first switch 3 closes, second switch 5 disconnects, when the controlled coils dead electricity of circuit breaker, the first switch 3 disconnects, and second switch 5 closes.
In a preferred embodiment, give the resistance proportioning of linear resistance R1 and nonlinear resistance R, concrete, linear resistance be the 3-6 of excitation winding resistance doubly, nonlinear resistance individually by its resistance during rated exciting current be the 2-4 of excitation winding doubly.Nonlinear resistance is being less than the 3-5 of rated excitation voltage doubly by its voltage during 3 times of rated exciting currents.Wherein excitation winding resistance is determined by rated excitation voltage and rated exciting current, once generator is determined, its rated excitation voltage and rated exciting current are known parameters.
Fig. 2 ~ 4 illustrate the demagnetization energy of this preferred embodiment under different demagnetization operating mode, wherein abscissa representing time, and ordinate is demagnetization energy, and unit is J(joule).
See Fig. 2, when generator is under rated condition during demagnetization, linear resistance about bears 3/5 of whole demagnetization energy, and nonlinear resistance about bears 2/5 of whole demagnetization energy; See Fig. 3, generator is under generator three-phase short-circuit of machine's port operating mode during demagnetization, and linear resistance about bears 2/5 of whole demagnetization energy, and nonlinear resistance about bears 3/5 of whole demagnetization energy; Generator occurs unloaded when encouraging by force demagnetization under operating mode by mistake, and the demagnetization energy that linear resistance and nonlinear resistance are born is substantially identical.
Visible the utility model has given full play to the demagnetization advantage of linear resistance and nonlinear resistance, and when exciting current is less, linear resistance absorbs most magnetic field energy, i.e. Fig. 2.When exciting current is larger, nonlinear resistance absorbs most of magnetic field energy, i.e. Fig. 3.Simultaneously because the voltage of nonlinear resistance linearly can't increase with electric current increase, effectively limit the drop-out voltage on de-excitation resistance, protect circuit element.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. generator linear resistance and a nonlinear resistance mixing demagnetization circuit, is characterized in that, comprise the first switch and demagnetization branch road; Described demagnetization branch road comprises second switch, linear resistance and nonlinear resistance;
One end of described first switch is connected with the first output of thyristor rectifier bridge, and the other end of the first switch is connected with one end of load, one end of demagnetization branch road simultaneously; The other end of load, the other end of demagnetization branch road are connected with another output of thyristor rectifier bridge simultaneously;
In demagnetization branch road, connect with second switch after linear resistance and nonlinear resistance parallel connection;
Described second switch is used for turning off when the first switch conduction, conducting in certain hour when the first switch OFF or before the first switch OFF.
2. a kind of generator linear resistance according to claim 1 and nonlinear resistance mixing demagnetization circuit, it is characterized in that, linear resistance be the 3-6 of excitation winding resistance doubly, nonlinear resistance individually by its resistance during rated exciting current be the 2-4 of excitation winding doubly.
3. a kind of generator linear resistance according to claim 2 and nonlinear resistance mixing demagnetization circuit, is characterized in that, nonlinear resistance is being less than the 3-5 of rated excitation voltage doubly by its voltage during 3 times of rated exciting currents.
4. a kind of generator linear resistance according to claim 1 and nonlinear resistance mixing demagnetization circuit, is characterized in that, described linear resistance is electric resistance of stainless or cast iron resistance or ceramic wire-wound resistor.
5. a kind of generator linear resistance according to claim 1 and nonlinear resistance mixing demagnetization circuit, it is characterized in that, described nonlinear resistance is carborundum resistance or ZnO resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520636989.5U CN204947951U (en) | 2015-08-24 | 2015-08-24 | A kind of generator linear resistance and nonlinear resistance mixing demagnetization circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520636989.5U CN204947951U (en) | 2015-08-24 | 2015-08-24 | A kind of generator linear resistance and nonlinear resistance mixing demagnetization circuit |
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| CN204947951U true CN204947951U (en) | 2016-01-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771560A (en) * | 2016-12-06 | 2017-05-31 | 上海纳信实业有限公司 | A kind of eliminating magnetism of generator resistance energy absorption measurement apparatus |
| CN113992082A (en) * | 2021-10-11 | 2022-01-28 | 南京南瑞继保电气有限公司 | Combined de-excitation resistor circuit |
-
2015
- 2015-08-24 CN CN201520636989.5U patent/CN204947951U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771560A (en) * | 2016-12-06 | 2017-05-31 | 上海纳信实业有限公司 | A kind of eliminating magnetism of generator resistance energy absorption measurement apparatus |
| CN113992082A (en) * | 2021-10-11 | 2022-01-28 | 南京南瑞继保电气有限公司 | Combined de-excitation resistor circuit |
| CN113992082B (en) * | 2021-10-11 | 2024-04-05 | 南京南瑞继保电气有限公司 | Combined de-excitation resistor circuit |
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| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20181122 Address after: 618000 No. 18, Third Section of Lushan South Road, Deyang City, Sichuan Province Co-patentee after: Dongfang Electric Group Dongfang Motor Co., Ltd. Patentee after: Dongfang Electric Automatic Control Engineering Co., Ltd. Address before: 618000 No. 138 Jialing Jiangxi Road, Deyang City, Sichuan Province Co-patentee before: Dongfang Electric Group Dongfang Motor Co., Ltd. Patentee before: DFEM Control Equipment Co., Ltd. |