CN208849446U - A kind of capacitive blocking device of band auxiliary breaking circuit - Google Patents
A kind of capacitive blocking device of band auxiliary breaking circuit Download PDFInfo
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- CN208849446U CN208849446U CN201821854939.4U CN201821854939U CN208849446U CN 208849446 U CN208849446 U CN 208849446U CN 201821854939 U CN201821854939 U CN 201821854939U CN 208849446 U CN208849446 U CN 208849446U
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- thyristor
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Abstract
The utility model discloses a kind of capacitive blocking devices of band auxiliary breaking circuit, by installing auxiliary cutoff thyristor additional at the both ends of original anti-parallel thyristor and filling energy capacitor, so that when asymmetrical three-phase failure zero-sequence current and neutral point direct current occur simultaneously, since the neutral point direct current duration is longer, the neutral point direct current flowed continuously through in anti-parallel thyristor will lead to anti-parallel thyristor shutdown failure, trigger signal will to be connected with the auxiliary cutoff thyristor of anti-parallel thyristor parallel connection at this time, by fill can capacitor generate electric current by acting in opposition in circuit, so that the electric current of anti-parallel thyristor, which is less than it, maintains electric current, to realize the successful shutdown of anti-parallel thyristor, the anti-and thyristor for solving traditional capacitance blocking device can go out when asymmetrical three-phase failure occurs simultaneously with direct current transportation monopole the earth operation Now shutdown failure puts into the technical issues of failing so as to cause capacitor.
Description
Technical field
The utility model relates to the capacitive blockings of power electronics field more particularly to a kind of band auxiliary breaking circuit
Device.
Background technique
DC transmission system because debugging or failure use monopole operating mode when can using greatly as circuit, cause underground
There is big DC current to flow through for a long time, thus earth's surface electric current can be generated in certain area around its direct current grounding pole, so that away from
It is increased from the transformer neutral point current potential in the closer AC Substation of direct current grounding pole, it can be by if transformer neutral point ground connection
To interference, generate DC component in the exciting current of transformer and make core magnetic saturation, to generate harmonic wave, cause vibration and
The problems such as noise, overheat, the damage of transformer can be caused when serious；Harmonic wave is also possible to cause the resonance of capacity reactance device group to damage
It is bad, cause the problems such as false protection.These influences will finally injure the safe operation of electric system.
Capacitive blocking device is to can detecte transformer neutral conductor D.C. magnetic biasing electricity what transformer neutral point installed additional
When stream is more than limit value, capacitor is sealed in into the electrical equipment between transformer neutral point and earth mat, " blocking (stream) is logical using capacitor
Hand over (stream) " the characteristics of, effectively separate the DC current for flowing through the transformer neutral conductor.Capacitor blocking device is in detecting transformer
Property line DC magnetic bias current be more than limit value and while reaching prescribes a time limit, mechanical bypass switch can be automatically opened, capacitor is sealed in into transformation
Between device neutral point and earth mat, the characteristics of using capacitor " blocking (stream) logical hand over (stream) ", effectively separates and flow through the transformer neutral conductor
DC current.The capacitive blocking device side of a bidirectional thyristor branch as capacitor in parallel on capacitor branches
Road protection system simultaneously provides access for the zero-sequence current generated when asymmetrical three-phase failure.
The electrical schematic diagram of traditional capacitance type blocking device is as shown in figure 3, the device only considered DC transmission system list
Greatly the method for operation when neutral point direct current harm and asymmetrical three-phase failure neutral point flow through the feelings that zero-sequence current individually occurs
Condition.When zero-sequence current and neutral point direct current occur simultaneously, the logic control function of this capacitive blocking device considers
It is insufficient.On existing hardware and logic judgment, if a transformer neutral point equipped with capacitive blocking device first occurs three
Phase unbalanced fault zero-sequence current, the anti-parallel thyristor conducting of protective condenser, DC transmission system switch to list simultaneously at this time
There is DC current in the greatly method of operation, transformer neutral point, then anti-parallel thyristor can have always electric current to flow through in leading
Logical state, blocking switch motion failure, causes capacitor to put into the technical issues of failing.
Utility model content
The utility model provides a kind of capacitive blocking device of band auxiliary breaking circuit, solves traditional capacitance blocking
The anti-and thyristor of device will appear shutdown when asymmetrical three-phase failure and the earth operation of direct current transportation monopole occur simultaneously and lose
The technical issues of losing, putting into failure so as to cause capacitor.
The utility model provides a kind of capacitive blocking device of band auxiliary breaking circuit, comprising:
Assist breaking circuit and capacitive blocking device；
The auxiliary breaking circuit include first fill can capacitor, second fill can capacitor, first auxiliary cutoff thyristor
With the second auxiliary cutoff thyristor；
It include the first anti-parallel thyristor and the second anti-parallel thyristor in the capacitive blocking device；
The first end that the anode of the first auxiliary cutoff thyristor fills energy capacitor with described first is connect；
The cathode of the first auxiliary cutoff thyristor is connect with the cathode of first anti-parallel thyristor；
Described first second end for filling energy capacitor is connect with the anode of first anti-parallel thyristor；
The first end that the anode of the second auxiliary cutoff thyristor fills energy capacitor with described second is connect；
The cathode of the second auxiliary cutoff thyristor is connect with the cathode of second anti-parallel thyristor；
Described second second end for filling energy capacitor is connect with the anode of second anti-parallel thyristor.
Optionally, the auxiliary breaking circuit further includes first diode and the second diode；
The anode of the first diode is connect with the cathode of the first auxiliary cutoff thyristor；
The cathode of the first diode is connect with the anode of the first auxiliary cutoff thyristor；
The anode of second diode is connect with the cathode of the second auxiliary cutoff thyristor；
The cathode of second diode is connect with the anode of the second auxiliary cutoff thyristor.
Optionally, the auxiliary breaking circuit further includes the first inductance and the second inductance；
First inductance is series at the anode of the first auxiliary cutoff thyristor and described first and fills energy capacitor
Between first end；
Second inductance is series at the anode of the second auxiliary cutoff thyristor and described second and fills energy capacitor
Between first end.
As can be seen from the above technical solutions, the utility model has the advantage that
The utility model is by installing auxiliary cutoff thyristor additional at the both ends of original anti-parallel thyristor and filling energy capacitor
Device, so that when asymmetrical three-phase failure zero-sequence current and neutral point direct current occur simultaneously, due to the neutral point direct current duration
Longer, the neutral point direct current flowed continuously through in anti-parallel thyristor will lead to anti-parallel thyristor shutdown failure, at this time triggering letter
Number it will to be connected with the auxiliary cutoff thyristor of anti-parallel thyristor parallel connection, the electric current that You Chongneng capacitor generates will reversely be made
For in circuit, so that the electric current of anti-parallel thyristor, which is less than its, maintains electric current, to realize the successful pass of anti-parallel thyristor
Disconnected, the anti-and thyristor for solving traditional capacitance blocking device is run together in asymmetrical three-phase failure and direct current transportation monopole the earth
The technical issues of will appear shutdown failure when Shi Fasheng, putting into failure so as to cause capacitor.
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 the electric hookup for the capacitive blocking device that band provided by the utility model assists breaking circuit；
Fig. 2 is the electric hookup of auxiliary breaking circuit and anti-parallel thyristor provided by the utility model；
Fig. 3 is the electric hookup of traditional capacitive blocking device；
Fig. 4 is the simplification electric diagram of traditional capacitive blocking device；
Fig. 5 is the SCR waveform diagram of traditional capacitive blocking device；
Fig. 6 is the SCR waveform diagram for the capacitive blocking device that band provided by the utility model assists breaking circuit.
Specific embodiment
The utility model embodiment provides a kind of capacitive blocking device of band auxiliary breaking circuit, solves traditional electricity
The anti-and thyristor for holding blocking device will appear when asymmetrical three-phase failure occurs simultaneously with direct current transportation monopole the earth operation
Shutdown failure puts into the technical issues of failing so as to cause capacitor.
It, below will knot to enable the purpose of utility model, feature, advantage of the utility model more obvious and understandable
The attached drawing in the utility model embodiment is closed, the technical scheme in the utility model embodiment is clearly and completely described,
Obviously, the embodiments described below are only the utility model a part of the embodiment, and not all embodiment.Based on this reality
It is obtained by those of ordinary skill in the art without making creative efforts all other with the embodiment in novel
Embodiment is fallen within the protection scope of the utility model.
Fig. 1 and Fig. 2 are please referred to, the utility model provides a kind of capacitive blocking device of band auxiliary breaking circuit, packet
It includes:
Assist breaking circuit and capacitive blocking device；
Auxiliary breaking circuit include first fill can capacitor C1, second fill can capacitor C2, the first auxiliary cutoff thyristor
The auxiliary of SCR3 and second cutoff thyristor SCR4；
It include the first anti-parallel thyristor SCR1 and the second anti-parallel thyristor SCR2 in capacitive blocking device；
The first end that the anode of first auxiliary cutoff thyristor SCR3 fills energy capacitor C1 with first is connect；
The cathode of first auxiliary cutoff thyristor SCR3 is connect with the cathode of the first anti-parallel thyristor SCR1；
First second end for filling energy capacitor C1 is connect with the anode of the first anti-parallel thyristor SCR1；
The first end that the anode of second auxiliary cutoff thyristor SCR4 fills energy capacitor C2 with second is connect；
The cathode of second auxiliary cutoff thyristor SCR4 is connect with the cathode of the second anti-parallel thyristor SCR2；
Second second end for filling energy capacitor C2 is connect with the anode of the second anti-parallel thyristor SCR2；
It should be noted that real work logic is for positive group, as asymmetrical three-phase failure zero-sequence current I1And neutrality
Point direct current I2Simultaneously when occurring, because the neutral point direct current duration is longer, the I that is flowed continuously through in the second anti-parallel thyristor SCR22
It will lead to its shutdown failure.The second auxiliary cutoff thyristor SCR4 is connected in trigger signal at this time, and being filled by first can capacitor C1
Acting in opposition in just group circuit, is made the electric current of the second anti-parallel thyristor SCR2 be less than its and maintains electric current, make the by the I3 of generation
Two anti-parallel thyristor SCR2 are successfully turned off, and reverse group is similarly.The second anti-parallel thyristor SCR2 of original asymmetrical three-phase failure with
The current waveform figure that situation occurs simultaneously in neutral point direct current is as shown in Figure 5.
Assuming that in t0Moment flows through the zero-sequence current I of asymmetrical three-phase failure generation in the second anti-parallel thyristor SCR21,
And triggering and conducting.In t1Before the shutdown of moment the second anti-parallel thyristor SCR2, DC transmission system monopole the earth operation is generated
Neutral point direct current I2Flowing into the second anti-parallel thyristor SCR2 will lead to the electric current I for flowing through the second anti-parallel thyristor SCR2 in t1
It is permanent after moment to be greater than zero.Second anti-parallel thyristor SCR2 in conducting, when main circuit current be not reduced to close to
Zero obtains situation, then the second anti-parallel thyristor SCR2 shutdown failure.
Assist the improved second anti-parallel thyristor SCR2 of shutdown formula in event a situation arises simultaneously lower current waveform figure
As shown in Figure 6.
Assuming that in t0When, the zero-sequence current I of asymmetrical three-phase failure generation is flowed through in the second anti-parallel thyristor SCR21, and
Trigger its conducting.In t1When the neutral point direct current that moment DC transmission system monopole the earth operation generates flows into, auxiliary is turned off back
Second fills the reverse current I that energy capacitor C2 is generated in road3The neutral point direct current I generated when being run with direct current transportation monopole the earth2
Act on the I formed4In t2Maintenance electric current of the moment less than the second anti-parallel thyristor SCR2, to make the second anti-parallel thyristor
SCR2 is successfully turned off, and device successfully puts into capacitance.
The utility model is by installing auxiliary cutoff thyristor additional at the both ends of original anti-parallel thyristor and filling energy capacitor
Device, so that when asymmetrical three-phase failure zero-sequence current and neutral point direct current occur simultaneously, due to the neutral point direct current duration
Longer, the neutral point direct current flowed continuously through in anti-parallel thyristor will lead to anti-parallel thyristor shutdown failure, at this time triggering letter
Number it will to be connected with the auxiliary cutoff thyristor of anti-parallel thyristor parallel connection, the electric current that You Chongneng capacitor generates will reversely be made
For in circuit, so that the electric current of anti-parallel thyristor, which is less than its, maintains electric current, to realize the successful pass of anti-parallel thyristor
Disconnected, the anti-and thyristor for solving traditional capacitance blocking device is run together in asymmetrical three-phase failure and direct current transportation monopole the earth
The technical issues of will appear shutdown failure when Shi Fasheng, putting into failure so as to cause capacitor.
Further, auxiliary breaking circuit further includes first diode D1 and the second diode D2；
The anode of first diode D1 is connect with the cathode of the first auxiliary cutoff thyristor SCR3；
The cathode of first diode D1 is connect with the anode of the first auxiliary cutoff thyristor SCR3；
The anode of second diode D2 is connect with the cathode of the second auxiliary cutoff thyristor SCR4；
The cathode of second diode D2 is connect with the anode of the second auxiliary cutoff thyristor SCR4.
Further, auxiliary breaking circuit further includes the first inductance L1 and the second inductance L2；
First inductance L1 is series at the anode of the first auxiliary cutoff thyristor SCR3 and first and fills the first of energy capacitor C1
Between end；
Second inductance L2 is series at the anode of the second auxiliary cutoff thyristor SCR4 and second and fills the first of energy capacitor C2
Between end.
A kind of control model of the capacitive blocking device of band auxiliary breaking circuit provided by the utility model is as follows:
For the transformer of transformer neutral point ground connection operation, under capacitive blocking device by-pass switch normal operating mode
In "on" position；It is monitored on the alternating current and DC component, capacitor of the transformer neutral conductor by electric current, voltage sensor
DC voltage, according to preset strategy control capacitor blocking device by-pass switch switching on and off.
(1) normal condition: due to the ground fault and direct current system monopolar operation of AC system or asymmetric operation, it is
Abnormal operation condition, probability of happening is low, and the duration is short, for the sake of the safety run for grounding transformer and block capacitor,
The operation of capacitive blocking device is with control control strategy: thyristor bypass (is not turned on) in off state, and mechanical by-pass is opened
It closes and closes, transformer neutral point is directly grounded, and block capacitor is bypassed short circuit；Device is by-path running status, in transformer
Property point be directly grounded operating status.
(2) blocking device put into: when detect neutral point direct current be more than setting limit value and the time reach time limit, capacitor
The investment of type blocking device.
If the neutral point zero sequence alternating current detected at this time is less than setting limit value, control by-pass switch is opened, will be electric
Container accesses between transformer and earth mat, and device works in blocking state；
If detect that neutral point zero-sequence current is greater than setting limit value, it is believed that AC system has asymmetry short circuit fault, protects
It holds by-pass switch and is in closing position；
If detecting, neutral point zero-sequence current is greater than the set value and neutral point direct current while when being more than setting value, assists closing
Disconnected system trigger, turns off SCR, and by-pass switch is opened, and capacitance investment, device works in blocking state.
(3) blocking device exits.
Capacitive blocking device is in blocking state, if detecting that capacitor DC voltage is restored to setting limit value or less
And reaching delay time, control by-pass switch closes a floodgate, and exits blocking state；Otherwise, blocking state is kept；
When capacitor both ends, DC voltage is still greater than setting limit value, if detecting, neutral point zero-sequence current is more than setting limit value
Or condenser voltage is when reaching pre-set value, it is believed that AC system has asymmetry short circuit fault, the rapid triggering and conducting crystalline substance lock of device
Pipe bypasses and triggers closure mechanical bypass switch, exits blocking state.
The above, above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng
The utility model is described in detail according to previous embodiment, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (3)
1. a kind of capacitive blocking device of band auxiliary breaking circuit characterized by comprising
Assist breaking circuit and capacitive blocking device；
The auxiliary breaking circuit include first fill can capacitor, second fill can capacitor, the first auxiliary cutoff thyristor and the
Two auxiliary cutoff thyristors；
It include the first anti-parallel thyristor and the second anti-parallel thyristor in the capacitive blocking device；
The first end that the anode of the first auxiliary cutoff thyristor fills energy capacitor with described first is connect；
The cathode of the first auxiliary cutoff thyristor is connect with the cathode of first anti-parallel thyristor；
Described first second end for filling energy capacitor is connect with the anode of first anti-parallel thyristor；
The first end that the anode of the second auxiliary cutoff thyristor fills energy capacitor with described second is connect；
The cathode of the second auxiliary cutoff thyristor is connect with the cathode of second anti-parallel thyristor；
Described second second end for filling energy capacitor is connect with the anode of second anti-parallel thyristor.
2. the capacitive blocking device of band auxiliary breaking circuit according to claim 1, which is characterized in that the auxiliary is closed
Deenergizing further includes first diode and the second diode；
The anode of the first diode is connect with the cathode of the first auxiliary cutoff thyristor；
The cathode of the first diode is connect with the anode of the first auxiliary cutoff thyristor；
The anode of second diode is connect with the cathode of the second auxiliary cutoff thyristor；
The cathode of second diode is connect with the anode of the second auxiliary cutoff thyristor.
3. the capacitive blocking device of band auxiliary breaking circuit according to claim 2, which is characterized in that the auxiliary is closed
Deenergizing further includes the first inductance and the second inductance；
First inductance is series at the anode of the first auxiliary cutoff thyristor and described first and fills the first of energy capacitor
Between end；
Second inductance is series at the anode of the second auxiliary cutoff thyristor and described second and fills the first of energy capacitor
Between end.
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| CN201821854939.4U CN208849446U (en) | 2018-11-12 | 2018-11-12 | A kind of capacitive blocking device of band auxiliary breaking circuit |
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| CN201821854939.4U CN208849446U (en) | 2018-11-12 | 2018-11-12 | A kind of capacitive blocking device of band auxiliary breaking circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952846A (en) * | 2021-04-23 | 2021-06-11 | 哈尔滨易成电气有限公司 | Parallel high-speed switching type voltage sag treatment system |
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2018
- 2018-11-12 CN CN201821854939.4U patent/CN208849446U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952846A (en) * | 2021-04-23 | 2021-06-11 | 哈尔滨易成电气有限公司 | Parallel high-speed switching type voltage sag treatment system |
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