CN211266474U - Arc extinguishing system - Google Patents
Arc extinguishing system Download PDFInfo
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- CN211266474U CN211266474U CN202020214178.7U CN202020214178U CN211266474U CN 211266474 U CN211266474 U CN 211266474U CN 202020214178 U CN202020214178 U CN 202020214178U CN 211266474 U CN211266474 U CN 211266474U
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Abstract
The embodiment of the utility model discloses arc extinguishing system, including vector transformer, vector voltage selector switch and earth fault selector switch, wherein, vector transformer's primary winding's first end is connected with the distribution network, and primary winding's second end is connected through vector voltage selector switch and vector transformer's secondary winding's first end, and secondary winding's second end ground connection, secondary winding's output voltage and primary winding's voltage have the phase difference. The embodiment of the utility model provides a can be when the distribution network takes place single-phase earth fault, for the neutral point of system provides the vector voltage of suitable phase place and amplitude, its result can reduce trouble phase to earth voltage, makes the fault point voltage reduce to the voltage level that can not maintain electric arc burning to reach the purpose of arc extinguishing. In order to be able to fix the faulty phase voltage completely at ground potential and to ensure the safety of personnel and the faulty point, the phase-splitting operation faulty phase grounding switch connected to the bus can be closed again subsequently to directly ground the faulty phase.
Description
Technical Field
The embodiment of the utility model provides a relate to electric power system protection field, especially relate to an arc extinguishing system.
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.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an arc extinguishing system.
According to an aspect of the present invention, an arc extinguishing system is provided. This arc extinguishing system includes: the vector transformer comprises a vector transformer, a vector voltage selection switch and a ground fault 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 first end of the ground fault selection switch is connected with the power distribution network, the second end of the ground fault selection switch is grounded, and the ground fault selection switch is correspondingly closed under the condition that the power distribution network has a ground fault.
According to the utility model discloses an embodiment, this vector voltage selection switch is phase splitting operation switch, and this vector voltage selection switch is closed correspondingly under this distribution network condition of earth fault.
According to the utility model discloses an embodiment, this earth fault option switch is phase splitting operating switch.
According to the utility model discloses an embodiment, this arc extinction system still includes: 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 ground fault selection switch, and 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 ground fault selection switch to be correspondingly closed under the condition of ground fault.
According to the utility model discloses an embodiment, this arc extinction system still includes: 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 utility model discloses an embodiment, under this earth fault is permanent earth fault's the condition, this earth fault option switch of this unit control of observing and controling is closed correspondingly.
According to the utility model discloses an embodiment, under this earth fault is permanent earth fault's the condition, this vector voltage selection switch of this unit control of observing and controling is opened correspondingly.
The embodiment of the utility model provides an inserted the vector voltage of suitable phase place and amplitude in zero sequence circuit to reduce earth fault point voltage, eliminate earth fault point electric arc, this can avoid above-mentioned transfer arc extinction technique in, because earth fault judges the different famous looks ground connection that inaccurate and caused mutually.
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 undue limitation to the invention. In the drawings:
fig. 1 is a schematic structural diagram of an arc extinguishing system 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 accompanying drawings in conjunction with embodiments.
According to the utility model discloses an embodiment provides an arc extinguishing system. Fig. 1 is a schematic structural diagram of an arc extinguishing system of the present invention. As shown in fig. 1, in the present embodiment, the arc extinguishing system includes: the system comprises a vector transformer 1, a vector voltage selection switch 2 and a ground fault selection switch 3, 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, 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 a phase difference; a first end of the ground fault selection switch 3 is connected to the electricity distribution network, a second end of the ground fault selection switch 3 is connected to ground, and the ground fault selection switch 3 is closed accordingly in the event of a ground fault in the electricity distribution network.
It should be noted that the vector transformer 1 in the embodiment of the present invention is different from a 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.
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 an embodiment of the present 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 utility model discloses an embodiment, this arc extinction system still includes: the voltage sensor 5 is connected with the power distribution network, and the measurement and control unit 6 is respectively connected with the voltage sensor 5 and the ground fault selection switch 3, and the measurement and control unit 6 judges 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 and controls the ground fault selection switch 3 to be correspondingly closed under the condition that the ground fault occurs.
In this embodiment, a voltage sensor 5 and a measurement and control unit 6 are added, wherein the voltage sensor 5 may adopt any sensor capable of detecting a voltage signal in the related art, and the measurement and control unit 6 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 5 and the measurement and control unit 6 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 in the case of the earth fault.
According to the utility model discloses an embodiment, above-mentioned arc extinguishing system still includes: and a current sensor 4, wherein a first end of the current sensor 4 is connected with a second end of the secondary winding, and a second end of the current sensor 4 is grounded. The measurement and control unit 6 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 4, and the measurement and control unit 6 also controls the ground fault selection switch 3 to be correspondingly closed or opened according to the ground fault. For example, in case the ground fault is a permanent ground fault, the measurement and control unit 6 controls the ground fault selection switch 3 to be closed accordingly and the vector voltage selection switch 2 to be opened accordingly.
In the present embodiment, a current sensor 4 is further added, wherein the current sensor 4 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 4 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 and the fault selection switch 3 to be closed or opened accordingly depending on the earth fault.
According to an embodiment of the present invention, the arc extinguishing system, when in use, includes steps S302 to S306 as follows.
Step S302: the measurement and control unit 6 monitors the voltage state of the power distribution network in real time through the voltage sensor 5, and judges whether the power distribution network has a ground fault.
Preferably, the measurement and control unit 6 may monitor the voltage signal of the secondary winding of the vector transformer in real time through the voltage sensor 5, 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 one-phase voltage drop and a two-phase voltage rise usually occur, or a one-phase voltage rise and a two-phase voltage drop slightly occur, or a zero-sequence voltage exceeds a threshold value usually occurs. 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 S304: under the condition that a single-phase earth fault occurs in the power distribution network, the measurement and control unit 6 sends a first instruction to the vector voltage selection switch 2, and the vector voltage selection switch 2 is connected to the second end of the primary winding through the secondary winding of the vector transformer.
Step S306: if the earth fault persists for more than a predetermined time, the measurement and control unit 6 determines that the earth fault of the distribution network is a permanent earth fault, and thus controls the earth fault selection switch 3 to be closed accordingly and controls the vector voltage selection switch 2 to be opened accordingly.
In summary, according to the above embodiments of the present invention, there is provided an arc suppression system, including a vector transformer, a vector voltage selection switch and a ground fault selection switch, wherein a first end of a primary winding of the vector transformer is connected to a power distribution network, a second end of the primary winding is connected to 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 an output voltage of the secondary winding and a voltage of the primary winding have a phase difference; the first end of the ground fault selection switch is connected with the power distribution network, the second end of the ground fault selection switch is grounded, and the ground fault selection switch is correspondingly closed under the condition that the power distribution network has a ground fault. The embodiment of the utility model provides an inserted the vector voltage of suitable phase place and amplitude in zero sequence circuit to reduce earth fault point voltage, eliminate earth fault point electric arc, this can avoid above-mentioned transfer arc extinction technique in, because earth fault judges the different famous looks ground connection that inaccurate and caused mutually.
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 (7)
1. An arc extinction system is characterized by comprising a vector transformer, a vector voltage selection switch and a ground fault 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 first end of the ground fault selection switch is connected with the power distribution network, the second end of the ground fault selection switch is grounded, and the ground fault selection switch is correspondingly closed under the condition that the power distribution network has a ground fault.
2. An arc suppression system as recited in claim 1 wherein said vector voltage selection switch is a split phase operation switch which closes accordingly in the event of a ground fault in said power distribution network.
3. An arc suppression system as recited in claim 1 wherein said ground fault select switch is a split phase operating switch.
4. An arc suppression system as claimed in any one of claims 1 to 3, 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 ground fault selection switch, and 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 ground fault 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 instrumentation and control unit controls the ground fault selection switch to close accordingly.
7. An arc suppression system according to claim 6, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020214178.7U CN211266474U (en) | 2020-02-26 | 2020-02-26 | Arc extinguishing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020214178.7U CN211266474U (en) | 2020-02-26 | 2020-02-26 | Arc extinguishing system |
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| CN211266474U true CN211266474U (en) | 2020-08-14 |
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| CN202020214178.7U Active CN211266474U (en) | 2020-02-26 | 2020-02-26 | Arc extinguishing system |
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