CN208707304U - A kind of quick de-excitation device - Google Patents
A kind of quick de-excitation device Download PDFInfo
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- CN208707304U CN208707304U CN201821691305.1U CN201821691305U CN208707304U CN 208707304 U CN208707304 U CN 208707304U CN 201821691305 U CN201821691305 U CN 201821691305U CN 208707304 U CN208707304 U CN 208707304U
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- varistor
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Abstract
The utility model embodiment discloses a kind of quick de-excitation device, which includes: the first varistor and multiple switch tube module and controller；Switching tube module includes: switching tube, diode and the second varistor, and first end, the second end of switching tube are connect with the two poles of the earth of diode respectively, and the third end of the second varistor and diodes in parallel, switching tube is connect with controller；Multiple switch tube module is followed in series to form switch module, after switch module and current limiter windings in series, then it is in parallel with the first varistor, the output end of the rectifier bridge at the both ends and source side of the first varistor connects.In the present invention, when needing quick de-excitation, controller can simultaneously turn off all switching tubes, and current limiter winding can then induce voltage, after the voltage enables the first varistor and the second varistor be connected, the quick release on resistance of the energy on winding can be made to carry out quick de-excitation.
Description
Technical field
The utility model relates to power grid demagnetizing technology field more particularly to a kind of quick de-excitation devices.
Background technique
With the expansion of power grid capacity, defeated, distribution system short-circuit current value is continuously improved, in order to reduce short circuit current
To switchgear maximum drop-out current hereinafter, needing to take certain methods to carry out current limliting.Superconductive failure current limiter is a kind of new
The Fault Current Limiting Device of type, when system operates normally, it appear that Low ESR, when short circuit occurs for system, by superconduction event
The magnet exciting coil demagnetization of barrier current limiter can produce high impedance to limit the rising of system short-circuit electric current, due to system short-circuit with moment
The electric current rate of climb is exceedingly fast, in order to make short circuit current be reduced to switchgear maximum drop-out current or less, it usually needs in 100ms
It is interior that exciting current is reduced by 90% or more.
The prior art is to the de-excitation method of current limiter as shown in Figure 1, degaussing switch time contact K2 closure, the main touching of degaussing switch
Head K1 is disconnected, and the degaussing switch both ends main contact K1 generate higher arc voltage, when arc voltage is higher than the conducting voltage of de-excitation resistance R
When with the sum of rectifier bridge output voltage, de-excitation resistance R conducting, coil energy passes through de-excitation resistance quick release.Demagnetization speed takes
Certainly in the conducting voltage of de-excitation resistance R, but the excessively high meeting of conducting voltage leads to that degaussing switch K1's is resistance to so that arc voltage is excessively high
Pressure and insulating requirements greatly improve, and existing degaussing switch is unable to satisfy excessively high voltage at present, leads to not quick de-excitation, and
Since the contact action time of degaussing switch is longer, the quick de-excitation time can not be met using mechanical switch.
Accordingly, it is desirable to provide a kind of field suppression equipment is to solve lacking due to degaussing switch structural behaviour itself in the prior art
Fall into caused by can not quick de-excitation the technical issues of.
Utility model content
The utility model discloses a kind of quick de-excitation device, solve in the prior art due to this body structure of degaussing switch
Caused by the defect of performance can not quick de-excitation the technical issues of.
The utility model provides a kind of quick de-excitation device, comprising: the first varistor and multiple switch tube module and
Controller；
The switch tube module includes: switching tube, diode and the second varistor, the first end of the switching tube,
Two ends are connect with the two poles of the earth of the diode respectively, second varistor and the diodes in parallel, the switching tube
Third end is connect with the controller；
Multiple switch tube modules are followed in series to form switch module, the switch module and current limiter windings in series
Afterwards, then in parallel with first varistor, the output end of the rectifier bridge at the both ends and source side of first varistor connects
It connects.
Preferably, a kind of quick de-excitation device provided by the invention further include: degaussing switch；
The first end of first varistor is just defeated by the main contacts of the degaussing switch and source side rectifier bridge
Outlet connection；
The secondary contact of the degaussing switch is in parallel with first varistor.
Preferably, the main contacts is normally off, and the secondary contact is normally off state.
Preferably, the switching tube is IGBT.
Preferably, first varistor and second varistor are zinc oxide.
As can be seen from the above technical solutions, the utility model embodiment has the advantage that
The utility model provides a kind of quick de-excitation device, which includes: the first varistor and multiple switch pipe
Module and controller；Switching tube module includes: switching tube, diode and the second varistor, first end, the second end of switching tube
It is connect respectively with the two poles of the earth of diode, the second varistor and diodes in parallel, the third end of switching tube is connect with controller；It is more
A switch tube module is followed in series to form switch module, after switch module and current limiter windings in series, then with the first varistor
Parallel connection, the output end connection of the rectifier bridge at the both ends and source side of the first varistor.In the present invention, when needing quick de-excitation
When, controller can simultaneously turn off all switching tubes, and current limiter winding can then induce voltage, which enables the first varistor
After the conducting of the second varistor, the quick release on resistance of the energy on winding can be made to carry out quick de-excitation, due to this
Switch in invention is electronic switch, actuation time it is small and due to switching tube and the second varistor it is in parallel after multiple groups string again
Connection, the conducting voltage that can be improved de-excitation resistance further realize quick de-excitation.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is de-excitation system schematic illustration in the prior art；
Fig. 2 is a kind of structural schematic diagram of one embodiment of quick de-excitation device provided by the invention.
Specific embodiment
The utility model embodiment discloses a kind of quick de-excitation device, solves in the prior art due to degaussing switch sheet
Caused by the defect of body structure performance can not quick de-excitation the technical issues of.
Referring to Fig. 1, a kind of one embodiment of the quick de-excitation device provided in the utility model embodiment includes:
First varistor 1 and multiple switch tube module and controller 3；
Switch tube module includes: switching tube 21, diode 22 and the second varistor 23, the first end of switching tube 21, the
Two ends are connect with the two poles of the earth of diode 22 respectively, and the second varistor 23 and diode 22 are in parallel, the third end of switching tube 21 with
Controller 3 connects；
Multiple switch tube module is followed in series to form switch module 2, after switch module 2 is connected with current limiter winding 4, then with
First varistor 1 is in parallel, the output end connection of the rectifier bridge 5 at the both ends and source side of the first varistor 1.
Further, a kind of quick de-excitation device provided by the invention further include: degaussing switch；
The positive output end that the first end of first varistor 1 passes through the main contacts 6 of degaussing switch and the rectifier bridge 5 of source side
Connection, the secondary contact 7 of degaussing switch are in parallel with the first varistor 1.
Further, when the whole system of Fig. 2 works normally, normally off, secondary touching usually are set by main contacts 6
Point 7 is set as normally off state, and each switching tube 21 is on state at this time.
Further, all switching tubes 21 in the present embodiment are ordinarily selected to IGBT.
Further, in order to realize optimal voltage clamping function, the first varistor 1 and the second varistor 23 are
It can be zinc oxide.
A kind of course of work of quick de-excitation device provided by the invention will be introduced below, it should be noted that
The quick de-excitation device of the embodiment of the present invention has the demagnetization function under Three models:
As shown in Fig. 2, under the control of the field regulator 8 of source side, main contacts 6 is set when whole system works normally
It is set to closed state, secondary contact 7 is set as off-state, and each switching tube 21 is on state at this time.
It (1), then can be to excitation after the monitor terminal of 4 side of current limiter winding monitors that short trouble occurs on current limiter
Adjuster 8 sends quick de-excitation instruction, and when quick de-excitation device enters quick de-excitation mode at this time, the control of field regulator 8 is gone out
Magnetic switch keeps normal operating conditions, and sends switching tube shutdown instruction to controller 3, so that the adjustment output pulse of controller 3
Simultaneously turn off all switching tubes 21.
After each pipe 21 that opens the light turns off, then current limiter winding 4 can induce backward voltage, which can enable the first pressure-sensitive electricity
Resistance 1 and the second varistor 23 are connected, and winding is made to generate the exciting current decline that higher reversed di/dt accelerates winding,
Energy on another winding carries out quick release on resistance, and exciting current rapid decrease is zero.Resistance will do it pressure limiting, energy simultaneously
Enough protect the component in circuit.
(2) after field regulator 8 receives the excitation halt instruction of monitor terminal transmission, then quick de-excitation device enters
Normal demagnetization mode.The case where degaussing switch and controller 3 keep normal operating conditions under the control of field regulator 8
Under, Trigger Angle is adjusted to inverse envelope by field regulator 8, so that the energy back of current limiter winding 4 is to source side, wherein control
The normal operating conditions of device 3 processed is the state that all switching tubes 21 of control are connected.
(3) (i.e. event occurs for source side at this time after field regulator 8 receives the excitation trip command of monitor terminal transmission
Barrier), then quick de-excitation device enters accident demagnetization mode.Controller 3 keeps working normally shape under the control of field regulator 8
State, degaussing switch disconnect main contacts 6 under the control of field regulator 8 and are closed time contact 7 so that current limiter winding 4 and time
Contact 7 constitutes continuous current circuit, and winding energy is consumed in the circuit.
A kind of quick de-excitation device provided by the invention has following advantages:
1, mechanical switch is replaced as electronic switch using IGBT element, reduces the switch motion time.
2, using the first multiple groups in parallel of connecting again of IGBT element and ZnO resistors, both pass through the electric conduction of raising de-excitation resistance
Pressure realizes quick de-excitation, and does not influence pressure resistance and the dielectric level of the devices such as major loop thyristor.
3, ZnO resistors can prevent overvoltage to protect IGBT element and winding in demagnetization.
A kind of quick de-excitation device provided by the utility model is described in detail above, for the one of this field
As technical staff have change in specific embodiments and applications based on the idea of the embodiment of the present invention
Place, in conclusion the content of the present specification should not be construed as a limitation of the present invention.
Claims (5)
1. a kind of quick de-excitation device characterized by comprising the first varistor and multiple switch tube module and controller；
The switch tube module includes: switching tube, diode and the second varistor, first end, the second end of the switching tube
It is connect respectively with the two poles of the earth of the diode, second varistor and the diodes in parallel, the third of the switching tube
End is connect with the controller；
Multiple switch tube modules are followed in series to form switch module, after the switch module and current limiter windings in series, then
It is in parallel with first varistor, the output end connection of the rectifier bridge at the both ends and source side of first varistor.
2. quick de-excitation device according to claim 1, which is characterized in that further include: degaussing switch；
The first end of first varistor passes through the main contacts of the degaussing switch and the positive output end of source side rectifier bridge
Connection；
The secondary contact of the degaussing switch is in parallel with first varistor.
3. quick de-excitation device according to claim 2, which is characterized in that the main contacts is normally off, described secondary
Contact is normally off state.
4. according to claim 1 to quick de-excitation device described in 3 any one, which is characterized in that the switching tube is IGBT.
5. according to claim 1 to quick de-excitation device described in 3 any one, which is characterized in that first varistor
It is zinc oxide with second varistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821691305.1U CN208707304U (en) | 2018-10-18 | 2018-10-18 | A kind of quick de-excitation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821691305.1U CN208707304U (en) | 2018-10-18 | 2018-10-18 | A kind of quick de-excitation device |
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| Publication Number | Publication Date |
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| CN208707304U true CN208707304U (en) | 2019-04-05 |
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| CN201821691305.1U Active CN208707304U (en) | 2018-10-18 | 2018-10-18 | A kind of quick de-excitation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066632A (en) * | 2018-10-18 | 2018-12-21 | 广东电网有限责任公司 | A kind of quick de-excitation device and method |
-
2018
- 2018-10-18 CN CN201821691305.1U patent/CN208707304U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066632A (en) * | 2018-10-18 | 2018-12-21 | 广东电网有限责任公司 | A kind of quick de-excitation device and method |
| CN109066632B (en) * | 2018-10-18 | 2024-01-23 | 广东电网有限责任公司 | Rapid de-excitation method |
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