CN111181146A - Arc suppression system and method - Google Patents
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- CN111181146A CN111181146A CN202010121697.3A CN202010121697A CN111181146A CN 111181146 A CN111181146 A CN 111181146A CN 202010121697 A CN202010121697 A CN 202010121697A CN 111181146 A CN111181146 A CN 111181146A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001629 suppression Effects 0.000 title claims description 24
- 238000004804 winding Methods 0.000 claims abstract description 92
- 230000008033 biological extinction Effects 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims description 38
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000010891 electric arc Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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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
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/167—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass combined with other earth-fault protective arrangements
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Abstract
The invention discloses an arc extinction system and method. The system comprises: the vector transformer comprises a vector transformer and a vector voltage selection switch, wherein a first end of a primary winding of the vector transformer is connected with a power distribution network, a second end of the primary winding is connected with a first end of a secondary winding of the vector transformer through the vector voltage selection switch, a second end of the secondary winding is grounded, and the output voltage of the secondary winding and the voltage of the primary winding have a phase difference; the vector voltage selection switch is correspondingly closed in the event of an earth fault in the distribution network. The invention accesses vector voltage with proper phase and amplitude in the zero sequence loop to reduce the voltage of the earth fault point and eliminate the arc of the earth fault point.
Description
Technical Field
The embodiment of the invention relates to the field of power system protection, in particular to an arc extinction system and method.
Background
Most domestic 6 KV-35 KV power distribution networks are neutral point ungrounded systems. According to statistics, more than 70% of faults of the power distribution network system are single-phase earth faults. Under the condition of single-phase earth fault, electric arcs are difficult to extinguish, high-frequency overvoltage and power frequency overvoltage of high power are easy to generate, and normal operation of a system is damaged. If the arc is difficult to extinguish for a long time, an inter-phase short circuit accident may also occur, leading to more serious consequences.
In the related art, an arc-extinguishing coil is usually connected to a neutral point of a distribution network to compensate for a current of a ground fault point and extinguish an arc of the ground fault point. However, in recent years, with the increase in cabling ratio, capacitance current to ground of a power distribution grid system has been increasing, and absolute values of resistive current, high-frequency current, and harmonic current have also been increasing. The arc suppression coil can only compensate power frequency capacitive current flowing through a ground fault point, so that arc suppression is difficult to effectively perform.
In the related art, a transfer arc extinction technology is also adopted, namely, a grounding fault point is directly metal-grounded through a selection switch on a bus side of a power distribution network system so as to transfer the current of the grounding fault point and eliminate the electric arc of the grounding fault point. However, in the arc extinction process, due to inaccurate judgment of the grounding fault phase, the different phase may be grounded, so that the inter-phase short circuit is caused, and a more serious short circuit accident is caused.
Disclosure of Invention
In order to solve the above problems, the present invention provides an arc extinction system and method.
According to one aspect of the invention, an arc suppression system is provided. This arc extinguishing system includes: the vector transformer comprises a vector transformer and a vector voltage selection switch, wherein a first end of a primary winding of the vector transformer is connected with a power distribution network, a second end of the primary winding is connected with a first end of a secondary winding of the vector transformer through the vector voltage selection switch, a second end of the secondary winding is grounded, and the output voltage of the secondary winding and the voltage of the primary winding have a phase difference; the vector voltage selection switch is correspondingly closed in the event of an earth fault in the distribution network.
According to one aspect of the invention, an arc suppression system is also provided. This arc extinguishing system includes: the vector transformer and the vector voltage selection switch are arranged, wherein the first end of a primary winding of the vector transformer is connected with the first end of a II-section bus connection switch of the power distribution network; the first end of the secondary winding of the vector transformer is connected with the second end of the I-section bus connecting switch of the power distribution network through the vector voltage selection switch, the second end of the secondary winding is grounded, and the output voltage of the secondary winding and the voltage of the primary winding have phase difference; the vector voltage selection switch is correspondingly closed in the event of an earth fault in the distribution network.
According to an embodiment of the invention, the vector voltage selection switch is a split-phase operation switch.
According to an embodiment of the invention, the arc suppression system further comprises: the voltage sensor is connected with the power distribution network; and the measurement and control unit is respectively connected with the voltage sensor and the vector voltage selection switch, judges whether the power distribution network has ground fault according to the voltage signal of the power distribution network fed back by the voltage sensor and controls the vector voltage selection switch to be correspondingly closed under the condition of ground fault.
According to an embodiment of the invention, the arc suppression system further comprises: a current sensor, wherein a first end of the current sensor is connected with a second end of the secondary winding, and a second end of the current sensor is grounded; the measurement and control unit also judges whether the ground fault is an instantaneous ground fault or a permanent ground fault according to the current signal of the secondary winding fed back by the current sensor, and controls the vector voltage selection switch to be correspondingly closed or opened according to the ground fault.
According to the embodiment of the invention, in the case that the ground fault is a permanent ground fault, the measurement and control unit controls the vector voltage selection switch to be correspondingly opened.
According to another aspect of the present invention, there is provided an arc extinction method applied to any one of the arc extinction systems described above, wherein in case of a ground fault on a power distribution network, a vector voltage selection switch is closed accordingly, wherein a first end of the vector voltage selection switch is connected to a second end of a primary winding of a vector transformer, the second end of the vector voltage selection switch is connected to a first end of a secondary winding of the vector transformer, the first end of the primary winding of the vector transformer is connected to the power distribution network, the second end of the secondary winding of the vector transformer is grounded, and an output voltage of the secondary winding of the vector transformer is out of phase with a voltage of the primary winding of the vector transformer.
According to another aspect of the present invention, there is also provided an arc extinction method applied to any one of the arc extinction systems described above, wherein in case of an earth fault on the power distribution network, the vector voltage selection switch is closed accordingly, wherein a first end of the vector voltage selection switch is connected to a second end of the II-section bus bar connection switch of the power distribution network, a second end of the vector voltage selection switch is connected to a first end of the secondary winding of the vector transformer, the first end of the primary winding of the vector transformer is connected to the first end of the I-section bus bar connection switch of the power distribution network, the second end of the secondary winding of the vector transformer is grounded, and an output voltage of the secondary winding of the vector transformer is out of phase with a voltage of the primary winding of the vector transformer.
Before the vector voltage selection switch is closed correspondingly, the method further comprises the following steps: the vector voltage selection switch receives a first command; the vector voltage selection switch determines a first parameter corresponding to the first command; the vector voltage select switch is correspondingly closed according to the first parameter.
According to an embodiment of the present invention, before the vector voltage selection switch receives the first instruction, the method further includes: the measurement and control unit judges whether the power distribution network has a ground fault according to a voltage signal of the power distribution network fed back by the voltage sensor; and under the condition of ground fault, the measurement and control unit sends the first instruction to the vector transformer.
According to the embodiment of the invention, when one of the following three conditions exists in the voltage signal of the power distribution network, the measurement and control unit judges whether the power distribution network has a ground fault: any phase voltage in the three-phase voltage of the power distribution network is reduced, and the other two phase voltages are increased; any one of three-phase voltages of the power distribution network is increased, and the other two-phase voltage is reduced; the zero sequence of the power distribution network exceeds a threshold value.
According to an embodiment of the present invention, after the vector voltage selection switch is closed accordingly, further comprising: and under the condition that the ground fault is a permanent ground fault, the measurement and control unit controls the vector voltage selection switch to be correspondingly opened.
The embodiment of the invention accesses the vector voltage with proper phase and amplitude in the zero sequence circuit to reduce the voltage of the ground fault point and eliminate the electric arc of the ground fault point, thereby avoiding the grounding of the different-name phase caused by inaccurate judgment of the ground fault phase in the transfer arc extinction technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a first schematic structural diagram of an arc suppression system according to an embodiment of the invention;
fig. 2 is a second schematic structural diagram of an arc suppression system according to an embodiment of the invention;
FIG. 3 is a flow diagram of a method of arc extinction according to an embodiment of the invention; and
fig. 4 is a flowchart of a specific example of an arc extinguishing method according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
According to an embodiment of the present invention, an arc suppression system is provided. Fig. 1 is a first schematic structural diagram of an arc suppression system according to an embodiment of the present invention, as shown in fig. 1, the arc suppression system includes: the system comprises a vector transformer 1 and a vector voltage selection switch 2, wherein a first end of a primary winding of the vector transformer 1 is connected with a power distribution network, a second end of the primary winding is connected with a first end of a secondary winding of the vector transformer 1 through the vector voltage selection switch 2, a second end of the secondary winding is grounded, and the output voltage of the secondary winding has a phase difference with the voltage of the primary winding; the vector voltage selection switch 2 is correspondingly closed in the event of an earth fault in the distribution network.
According to an embodiment of the invention, an arc suppression system is also provided. Fig. 2 is a schematic structural diagram ii of an arc suppression system according to an embodiment of the present invention, and as shown in fig. 2, the arc suppression system includes: the system comprises a vector transformer 1 and a vector voltage selection switch 2, wherein the first end of a primary winding of the vector transformer 1 is connected with the first end of a II-section bus connection switch 6 of the power distribution network; a first end of a secondary winding of the vector transformer 1 is connected with a second end of an I-section bus connecting switch 6 of the power distribution network through the vector voltage selection switch 2, the second end of the secondary winding is grounded, and the output voltage of the secondary winding and the voltage of the primary winding have phase difference; the vector voltage selection switch 2 is correspondingly closed in the event of an earth fault in the distribution network.
In the embodiment of the present invention, the vector transformer 1 is different from the conventional transformer. In a conventional transformer, the neutral point of the transformer is connected to a crowbar coil for flowing a ground short-circuit current or a crowbar coil current. In the vector transformer, a voltage signal is connected to a neutral point of the transformer and used for providing vector voltage with proper phase and amplitude to the neutral point so as to reduce the voltage of a ground fault point and eliminate ground fault point electric arcs.
It should be noted that the transformation ratio of the primary winding and the secondary winding of the vector transformer 1 may be designed to be 1:1 (an optimal value, which is not limited to this value).
For convenience of description, the phase difference between the output voltage of the secondary winding and the voltage of the primary winding will be described by taking 180 degrees as an example. Meanwhile, the phase difference may also be 60 degrees or 120 degrees, optionally.
According to one embodiment of the invention, the vector voltage selection switch 2 is a split-phase operation switch. The vector voltage selector switches 2 are, for example, three-phase operating switches, each connected to a phase of the power distribution network for closing correspondingly in the event of an earth fault in the corresponding phase of the power distribution network.
According to the embodiment of the invention, the arc extinction system further comprises a voltage sensor 4 connected with the power distribution network and a measurement and control unit 3 respectively connected with the voltage sensor 4 and the vector voltage selection switch 2, wherein the measurement and control unit 3 is used for judging whether the power distribution network has a ground fault or not according to a voltage signal of the power distribution network fed back by the voltage sensor 4 and controlling the vector voltage selection switch 2 to be correspondingly closed under the condition that the ground fault occurs. In this embodiment, a voltage sensor 4 and a measurement and control unit 3 are added, wherein the voltage sensor 4 may adopt any sensor capable of detecting a voltage signal in the related art, and the measurement and control unit 3 may adopt a calculation unit capable of performing operation and judgment in the related art. Those skilled in the art know that the addition of the voltage sensor 4 and the measurement and control unit 3 is beneficial to more accurately judge whether the power distribution network has an earth fault or not and control the vector voltage selection switch 2 to be closed correspondingly under the condition of the earth fault.
According to an embodiment of the invention, the arc suppression system further comprises a current sensor 5, a first end of the current sensor 5 is connected with a second end of the secondary winding, and a second end of the current sensor 4 is grounded. Meanwhile, the measurement and control unit 3 also judges whether the ground fault is an instantaneous ground fault or a permanent ground fault according to a current signal of the secondary winding fed back by the current sensor 5, and the measurement and control unit 3 also controls the vector voltage selection switch 2 to be correspondingly closed or opened according to the ground fault.
In the present embodiment, a current sensor 5 is further added, wherein the current sensor 5 may adopt any sensor capable of detecting a current signal in the related art. Those skilled in the art will appreciate that the addition of the current sensor 5 facilitates further determination of whether the earth fault of the distribution network is a transient earth fault or a permanent earth fault, so as to control the vector voltage selection switch 2 to be closed or opened accordingly depending on the earth fault.
Specifically, if the ground fault is a permanent ground fault (for example, lasting for more than a predetermined time), the measurement and control unit 3 determines that the ground fault of the power distribution network is a permanent ground fault, and controls the vector voltage selection switch 2 to be turned on accordingly. It should be noted that the corresponding turning on of the vector voltage selection switch 2 does not represent a problem of abandoning the solution of the ground fault point, but on the contrary, because the ground fault of the power distribution network is a permanent ground fault, this is not a problem that the measurement and control unit 3 and the vector voltage selection switch 2 can solve, and therefore, the measurement and control unit 3 further triggers other electronic components to solve.
According to an embodiment of the present invention, there is provided an arc extinguishing method that can be applied to any of the arc extinguishing systems described above. The method comprises the following steps: in the case of a ground fault of the power distribution network, a vector voltage selection switch is correspondingly closed, wherein a first end of the vector voltage selection switch is connected with a second end of a primary winding of a vector transformer, a second end of the vector voltage selection switch is connected with a first end of a secondary winding of the vector transformer, the first end of the primary winding of the vector transformer is connected with the power distribution network, the second end of the secondary winding of the vector transformer is grounded, and an output voltage of the secondary winding of the vector transformer is out of phase with a voltage of the primary winding of the vector transformer.
According to an embodiment of the present invention, there is also provided an arc extinction method, which may be applied to any one of the arc extinction systems described above, in a case where an earth fault occurs in a power distribution network, a vector voltage selection switch is correspondingly closed, wherein a first end of the vector voltage selection switch is connected to a second end of a II-section bus tie switch of the power distribution network, the second end of the vector voltage selection switch is connected to a first end of a secondary winding of the vector transformer, the first end of the primary winding of the vector transformer is connected to a first end of an I-section bus tie switch of the power distribution network, the second end of the secondary winding of the vector transformer is grounded, and an output voltage of the secondary winding of the vector transformer is out of phase with a voltage of the primary winding of the vector transformer.
In the vector transformer of the embodiment of the invention, through the closing of the vector voltage selection switch, the neutral point of the transformer is connected with a voltage signal which is used for providing vector voltage with proper phase and amplitude for the neutral point so as to reduce the voltage of the ground fault point and eliminate the arc of the ground fault point.
Fig. 3 is a flowchart of an arc extinguishing method according to an embodiment of the present invention, as shown in fig. 3, further describing steps before the vector voltage selection switch is closed accordingly (step S308), including:
step S302: the vector voltage selection switch receives a first instruction, wherein the first instruction can be manually sent by a worker or automatically triggered by other electronic components;
step S304: the vector voltage selection switch determines a first parameter corresponding to the first command; and
step S306: the vector voltage select switch is determined to be correspondingly closed according to the first parameter.
The closing operation of the vector voltage selection switch is described in detail in this embodiment. By closing the vector voltage selection switch more accurately, the neutral point of the transformer is connected with a voltage signal for providing vector voltage with proper phase and amplitude to the neutral point so as to reduce the voltage of the ground fault point and eliminate the arc of the ground fault point.
According to an embodiment of the present invention, before the vector voltage selection switch receives the first instruction, the method further includes: the measurement and control unit judges whether the power distribution network has a ground fault according to a voltage signal of the power distribution network fed back by the voltage sensor; and under the condition of ground fault, the measurement and control unit sends the first instruction to the vector transformer. Specifically, when the voltage signal of the power distribution network has one of the following three conditions, the measurement and control unit judges whether the power distribution network has a ground fault: any phase voltage in the three-phase voltages of the power distribution network is reduced, and the other two phase voltages are increased; any one of three-phase voltages of the power distribution network is increased, and the other two-phase voltage is decreased; the zero sequence of the power distribution network exceeds a threshold value. In the embodiment of the invention, how the measurement and control unit determines whether the power distribution network has the ground fault by measuring the voltage signal of the power distribution network is described in detail, and particularly, the three situations represent the vast majority of the situations of the power distribution network having the ground fault.
According to an embodiment of the present invention, after the vector voltage selection switch is closed accordingly, the method further comprises: in case the ground fault is a permanent ground fault (e.g. lasting more than a predetermined time), the measurement and control unit controls the vector voltage selection switch to be opened accordingly. As has been described in detail above, if the measurement and control unit 3 also determines that the ground fault continues for more than a predetermined time according to the current signal of the secondary winding fed back by the current sensor 5, the ground fault of the power distribution network is a permanent ground fault, and thus controls the vector voltage selection switch 2 to be turned on accordingly. It should be noted that the corresponding turning on of the vector voltage selection switch 2 does not represent a problem of abandoning the solution of the ground fault point, but on the contrary, because the ground fault of the power distribution network is a permanent ground fault, this is not a problem that the measurement and control unit 3 and the vector voltage selection switch 2 can solve, and therefore, the measurement and control unit 3 further triggers other electronic components to solve.
In order to further explain the implementation process of the above embodiment, the invention also provides a specific example. Fig. 4 is a flowchart of a specific example of an arc extinguishing method according to an embodiment of the present invention, and includes steps S402 to S406 as follows, as shown in fig. 4.
Step S402: the measurement and control unit monitors the voltage state of the power distribution network in real time through the voltage sensor, judges whether the power distribution network has ground faults or not and judges the types of the ground faults.
Preferably, the measurement and control unit may monitor the voltage signal of the secondary winding of the vector transformer in real time through the voltage sensor, so as to monitor the voltage state of the power distribution network in real time, because when a single-phase grounding occurs in the power distribution network, a voltage of one phase decreases and a voltage of two phases increases, or a voltage of one phase increases and a voltage of two phases decreases slightly, or a zero-sequence voltage exceeds a threshold value. Therefore, the measurement and control unit monitors each phase voltage of the power distribution network through the voltage sensor, and when the situation is monitored to occur in the power distribution network, the single-phase earth fault of the power distribution network can be generally judged.
Step S404: under the condition that a single-phase earth fault occurs to the power distribution network, the measurement and control unit sends a first instruction to the vector voltage selection switch, and the vector voltage selection switch is connected to the second end of the primary winding through the secondary winding of the vector transformer.
Step S406: and the measurement and control unit continuously monitors the voltage state of the power distribution network in real time through the voltage sensor. If the earth fault continues to exceed the preset time, the measurement and control unit 3 judges that the earth fault of the power distribution network is a permanent earth fault, and accordingly controls the vector voltage selection switch 2 to be correspondingly opened and triggers other electronic components to solve the earth fault.
In summary, according to the above-described embodiments of the present invention, an arc suppression system and method are provided. This arc extinguishing system includes: the vector transformer comprises a vector transformer and a vector voltage selection switch, wherein a first end of a primary winding of the vector transformer is connected with a power distribution network, a second end of the primary winding is connected with a first end of a secondary winding of the vector transformer through the vector voltage selection switch, a second end of the secondary winding is grounded, and the output voltage of the secondary winding and the voltage of the primary winding have a phase difference; the vector voltage selection switch is correspondingly closed in the event of an earth fault in the distribution network. The embodiment of the invention accesses the vector voltage with proper phase and amplitude in the zero sequence circuit to reduce the voltage of the ground fault point and eliminate the electric arc of the ground fault point, thereby avoiding the grounding of the different-name phase caused by inaccurate judgment of the ground fault phase in the transfer arc extinction technology.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An arc suppression system, comprising: a vector transformer and a vector voltage selection switch, wherein,
the first end of a primary winding of the vector transformer is connected with a power distribution network, the second end of the primary winding is connected with the first end of a secondary winding of the vector transformer through the vector voltage selection switch, the second end of the secondary winding is grounded, and the output voltage of the secondary winding and the voltage of the primary winding have phase difference;
the vector voltage selection switch is correspondingly closed in the event of an earth fault in the distribution network.
2. An arc suppression system, comprising: a vector transformer and a vector voltage selection switch, wherein,
the first end of the primary winding of the vector transformer is connected with a section II bus of the power distribution network;
a first end of a secondary winding of the vector transformer is connected with an I-section bus of the power distribution network through the vector voltage selection switch, a second end of the secondary winding is grounded, and the output voltage of the secondary winding and the voltage of the primary winding have a phase difference;
the vector voltage selection switch is correspondingly closed in the event of an earth fault in the distribution network.
3. An arc suppression system as claimed in claim 1 or claim 2, wherein said vector voltage selection switch is a split phase operation switch.
4. An arc suppression system according to claim 1 or 2, further comprising:
the voltage sensor is connected with the power distribution network; and
and the measurement and control unit is respectively connected with the voltage sensor and the vector voltage selection switch, judges whether the power distribution network has ground fault or not according to the voltage signal of the power distribution network fed back by the voltage sensor and controls the vector voltage selection switch to be correspondingly closed under the condition of ground fault.
5. The arc suppression system of claim 4, further comprising:
a first end of the current sensor is connected with a second end of the secondary winding, and the second end of the current sensor is grounded;
the measurement and control unit also judges whether the ground fault is an instantaneous ground fault or a permanent ground fault according to the current signal of the secondary winding fed back by the current sensor, and controls the vector voltage selection switch to be correspondingly closed or opened according to the ground fault.
6. An arc suppression system according to claim 5, wherein in case the ground fault is a permanent ground fault, the measurement and control unit controls the vector voltage selection switch to be opened accordingly.
7. An arc extinction method applied to an arc extinction system according to claim 1, wherein in case of an earth fault in the distribution network, the vector voltage selection switches are closed accordingly, wherein,
a first end of the vector voltage selection switch is connected with a second end of a primary winding of a vector transformer, a second end of the vector voltage selection switch is connected with a first end of a secondary winding of the vector transformer,
the first end of the primary winding of the vector transformer is connected with the power distribution network, the second end of the secondary winding of the vector transformer is grounded, and the output voltage of the secondary winding of the vector transformer and the voltage of the primary winding of the vector transformer have phase difference.
8. An arc extinction method applied to an arc extinction system according to claim 2, wherein in the event of an earth fault in the distribution network, the vector voltage selection switches are closed accordingly, wherein,
the first end of the vector voltage selection switch is connected with the second end of a II-section bus connecting switch of the power distribution network, the second end of the vector voltage selection switch is connected with the first end of the secondary winding of the vector transformer,
the first end of the primary winding of the vector transformer is connected with the first end of the I-section bus connecting switch of the power distribution network, the second end of the secondary winding of the vector transformer is grounded, and the output voltage of the secondary winding of the vector transformer and the voltage of the primary winding of the vector transformer have phase difference.
9. The method of claim 7 or 8, further comprising, before the vector voltage select switches are respectively closed:
the vector voltage selection switch receives a first instruction;
the vector voltage selection switch determines a first parameter corresponding to the first instruction; and
the vector voltage select switch is determined to be correspondingly closed according to the first parameter.
10. The method of claim 9, prior to the vector voltage select switch receiving the first instruction, further comprising:
the measurement and control unit judges whether the power distribution network has a ground fault according to a voltage signal of the power distribution network fed back by the voltage sensor; and
and under the condition of ground fault, the measurement and control unit sends the first instruction to the vector transformer.
11. The method of claim 10, wherein the measurement and control unit determines whether the power distribution network has a ground fault when one of the following three conditions exist in the voltage signal of the power distribution network:
any phase voltage in the three-phase voltages of the power distribution network is reduced, and the other two phase voltages are increased;
any one of three-phase voltages of the power distribution network is increased, and the other two-phase voltage is decreased;
and the zero sequence of the power distribution network exceeds a threshold value.
12. The method of claim 11, further comprising, after the vector voltage select switches are respectively closed: and under the condition that the ground fault is a permanent ground fault, the measurement and control unit controls the vector voltage selection switch to be correspondingly opened.
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| CN202010121697.3A CN111181146B (en) | 2020-02-26 | 2020-02-26 | Arc extinction system and method |
| PCT/CN2021/071390 WO2021169643A1 (en) | 2020-02-26 | 2021-01-13 | Arc extinction system and method |
| CN202180004234.1A CN114026762B (en) | 2020-02-26 | 2021-01-13 | Arc suppression system and method |
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| WO2021169643A1 (en) * | 2020-02-26 | 2021-09-02 | 安徽一天电气技术股份有限公司 | Arc extinction system and method |
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| CN114068156A (en) * | 2021-11-19 | 2022-02-18 | 广东福德电子有限公司 | Improved grounding transformer used as substation transformer |
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| CN209709686U (en) * | 2019-01-14 | 2019-11-29 | 国网江西省电力有限公司南昌供电分公司 | It is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique |
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| WO2015035913A1 (en) * | 2013-09-16 | 2015-03-19 | 国家电网公司 | Single-phase grounding fault handling apparatus and method for power distribution network with non-effectively grounding neutral point |
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| CN209709686U (en) * | 2019-01-14 | 2019-11-29 | 国网江西省电力有限公司南昌供电分公司 | It is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique |
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| CN114026762A (en) | 2022-02-08 |
| WO2021169643A1 (en) | 2021-09-02 |
| CN111181146B (en) | 2024-08-27 |
| CN114026762B (en) | 2022-08-02 |
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