CN111181145A - Arc suppression system and method - Google Patents
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- CN111181145A CN111181145A CN202010121696.9A CN202010121696A CN111181145A CN 111181145 A CN111181145 A CN 111181145A CN 202010121696 A CN202010121696 A CN 202010121696A CN 111181145 A CN111181145 A CN 111181145A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001629 suppression Effects 0.000 title claims description 19
- 238000004804 winding Methods 0.000 claims abstract description 67
- 230000008033 biological extinction Effects 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims description 35
- 238000002955 isolation Methods 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 abstract description 5
- 230000007935 neutral effect Effects 0.000 description 9
- 230000001965 increasing effect Effects 0.000 description 4
- 238000010586 diagram 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
- 238000012986 modification Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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 the first end of a primary winding of the vector transformer is connected with a power distribution network, and 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 through the active power unit, and the output voltage of the secondary winding and the voltage of the primary winding have phase difference; the active power unit adjusts the amplitude and angle of the compensation voltage accordingly in case of a ground fault of the distribution network. The active power unit is connected with vector voltage with proper phase and amplitude, so that the voltage of the ground fault point is reduced, and the electric arc of the ground fault point is eliminated.
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, and 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; the second end of the secondary winding is grounded through the active power unit, and the output voltage of the secondary winding and the voltage of the primary winding have phase difference; the active power unit adjusts the amplitude and angle of the compensation voltage accordingly in case of a ground fault of the distribution network.
According to an embodiment of the invention, the vector voltage selection switch is a phase-split operation switch, which is closed accordingly in case of an earth fault of the distribution network.
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 is respectively connected with the current sensor and the active power unit and adjusts the amplitude and the angle of the compensation voltage of the active power unit according to the current signal of the secondary winding fed back by the current sensor; 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 opened under the condition that the ground fault is the permanent ground fault.
According to an embodiment of the invention, the active power unit is connected in series with the current sensor.
According to an embodiment of the present invention, the active power unit is connected to the vector transformer through an isolation coil, wherein the isolation coil includes a first coil and a second coil mutually inductive to the first coil, wherein a first end of the active power unit is connected to a first end of the second coil, and a second end of the active power unit is connected to a second end of the second coil.
According to an embodiment of the invention, the arc suppression system further comprises: the voltage sensor is respectively connected with the power distribution network and the measurement and control unit; the measurement and control unit also judges whether the power distribution network has a 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 the ground fault.
According to another aspect of the present invention, there is provided an arc extinction method applied to the arc extinction system, in case of a ground fault on a power distribution network, an active power unit adjusts the amplitude and angle of a compensation voltage accordingly, wherein a first end of the active power unit is connected to a second end of a secondary winding of the vector transformer, the second end of the active power unit is grounded, a first end of a primary winding of the vector transformer is connected to the power distribution network, the second end of the primary winding is connected to the first end of the secondary winding of the vector transformer through a vector voltage selection switch, 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, before the active power unit adjusts the amplitude and the angle of the compensation voltage accordingly, the method further includes: the active power unit determines a first parameter corresponding to a current signal of the secondary winding fed back by a current sensor; the active power unit adjusts the amplitude and angle of the compensation voltage according to the first parameter.
According to an embodiment of the present invention, after the active power unit adjusts the amplitude and the angle of the compensation voltage accordingly, the method further includes: 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.
According to the embodiment of the invention, the vector voltage with proper phase and amplitude is accessed through the active power unit, so that the voltage of the ground fault point is reduced, the electric arc of the ground fault point is eliminated, and the phenomenon that the different phase is grounded due to inaccurate judgment of the ground fault phase in the transfer arc extinction technology can be avoided.
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 one of the schematic diagrams of an arc suppression system according to an embodiment of the invention;
fig. 2 is a second schematic diagram of an arc suppression system according to an embodiment of the invention;
FIG. 3 is one of the flow charts of a method of arc extinction according to an embodiment of the invention; and
fig. 4 is a second flowchart of an arc extinguishing method according to an embodiment of the 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 one of schematic diagrams of an arc suppression system according to an embodiment of the present invention, as shown in fig. 1, the arc suppression system including: 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, and 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 through the active power unit 6, and the output voltage of the secondary winding and the voltage of the primary winding have phase difference; the active power unit 6 adjusts the amplitude and angle of the compensation voltage accordingly in case of a ground fault of the distribution network.
It should be noted that the vector transformer 1 in the embodiment of the present invention 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 an 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 current sensor 4 and a measurement and control unit 5, wherein a first end of the current sensor 4 is connected with a second end of the secondary winding, the second end of the current sensor 4 is grounded, and the measurement and control unit 5 adjusts the amplitude and the angle of the compensation voltage of the active power unit 6 according to a current signal of the secondary winding fed back by the current sensor 4. In this embodiment, the current sensor 4 may be any sensor capable of detecting a current signal in the related art, and the measurement and control unit 5 may be a calculation unit capable of performing calculation and determination in the related art. The measurement and control unit 5 adjusts the amplitude and the angle of the compensation voltage of the active power unit 6 according to the current signal at the active power unit 6 fed back by the current sensor 4, can further reduce the voltage of the ground fault point to zero, and more effectively eliminates the arc of the ground fault point.
According to the embodiment of the present invention, the measurement and control unit 5 further determines whether the ground fault is a transient ground fault or a permanent ground fault according to the current signal of the secondary winding fed back by the current sensor 4, and in case that the ground fault is a permanent ground fault, the measurement and control unit 5 controls the vector voltage selection switch 2 to be turned on accordingly. 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 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 5 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 5 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 invention, the active power unit 6 may be connected in series with the current sensor 5 (see fig. 1). According to an embodiment of the present invention, the active power unit 6 may also be connected with a vector transformer through an isolation coil (see fig. 2). The isolation coil includes a first coil and a second coil mutually inductive with the first coil, wherein a first end of the active power unit 6 is connected with a first end of the second coil, and a second end of the active power unit 6 is connected with a second end of the second coil.
According to an embodiment of the present invention, the arc extinction system further includes a voltage sensor 3 connected to the power distribution network, the measurement and control unit 5 determines whether a ground fault occurs in the power distribution network according to a voltage signal of the power distribution network fed back by the voltage sensor, and in case of a ground fault, the measurement and control unit controls the vector voltage selection switch to be correspondingly closed.
In the present embodiment, a voltage sensor 3 is added, wherein the voltage sensor 3 may adopt any sensor capable of detecting a voltage signal in the related art. The addition of a voltage sensor 3, as known to those skilled in the art, facilitates a more accurate determination of whether an earth fault has occurred in the distribution network and controls the vector voltage selection switch 2 to close accordingly in the event of an earth fault.
According to an embodiment of the present invention, there is also 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 in the power distribution network, the active power unit 6 adjusts the amplitude and angle of the compensation voltage accordingly, wherein the first end of the active power unit 6 is connected to the second end of the secondary winding of the vector transformer, the second end of the active power unit 6 is grounded, the first end of the primary winding of the vector transformer is connected to the power distribution network, the second end of the primary winding is connected to the first end of the secondary winding of the vector transformer through a vector voltage selection switch, and the output voltage of the secondary winding of the vector transformer is out of phase with the voltage of the primary winding of the vector transformer.
In this embodiment, before the active power unit 6 adjusts the amplitude and the angle of the compensation voltage accordingly, the method further includes: the active power unit responds to a user input and determines a first parameter corresponding to the user input; the active power unit adjusts the amplitude and angle of the compensation voltage according to the first parameter.
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 one of flowcharts of an arc extinguishing method according to an embodiment of the present invention, and as shown in fig. 3, includes steps S302 to S306 as follows:
step S302: the active power unit 6 receives a second instruction, wherein the second instruction can be sent manually by a worker or automatically triggered by other electronic components;
step S304: the active power unit 6 determines a second parameter corresponding to the second instruction; and
step S306: the active power unit 6 adjusts the amplitude and angle of the compensation voltage accordingly.
The operation of the active power unit 6 to adjust the amplitude and angle of the compensation voltage is described in detail in this embodiment. The neutral point of the transformer is connected with a voltage signal, and the voltage of the ground fault point can be reduced and the electric arc of the ground fault point can be eliminated by providing compensation voltage with proper phase and amplitude for the neutral point.
According to an embodiment of the present invention, before the active power unit 6 receives the second 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 the measurement and control unit sends the second instruction to the active power unit 6 in case of a ground fault. 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 voltage 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 active power unit adjusts the amplitude and the angle of the compensation voltage accordingly, the method further includes: in case the earth fault is a permanent earth fault (e.g. lasting more than a predetermined time), the measurement and control unit 3 controls the vector voltage selection switch 2 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.
Fig. 4 is a second flowchart of the arc extinguishing method according to the embodiment of the present invention, and as shown in fig. 4, includes steps S402 to S406 as follows.
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 ground fault is a permanent ground fault (e.g. persists for more than a predetermined time), the measurement and control unit 4 determines that the ground fault of the power distribution network is a permanent ground fault, and accordingly controls the vector voltage selection switch 2 to be opened accordingly and triggers other electronic components to solve the ground fault.
In summary, according to the above-described embodiments of the present invention, an arc suppression system and method are provided. The arc extinction system 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, and 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; the second end of the secondary winding is grounded through the active power unit, and the output voltage of the secondary winding and the voltage of the primary winding have phase difference; the active power unit adjusts the amplitude and angle of the compensation voltage accordingly in case of a ground fault of the distribution network. According to the embodiment of the invention, the vector voltage with proper phase and amplitude is accessed through the active power unit, so that the voltage of the ground fault point is reduced, the electric arc of the ground fault point is eliminated, and the phenomenon that the different phase is grounded due to inaccurate judgment of the ground fault phase in the transfer arc extinction technology can be avoided.
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 (9)
1. 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 power distribution network, and the second end of the primary winding is connected with the first end of the secondary winding of the vector transformer through the vector voltage selection switch; the second end of the secondary winding is grounded through the active power unit, and the output voltage of the secondary winding and the voltage of the primary winding have phase difference;
the active power unit adjusts the amplitude and angle of the compensation voltage accordingly in case of a ground fault of the distribution network.
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. The arc suppression system of claim 2, 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; and
the measurement and control unit is respectively connected with the current sensor and the active power unit and adjusts the amplitude and the angle of the compensation voltage of the active power unit according to the current signal of the secondary winding fed back by the current sensor;
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 opened under the condition that the ground fault is the permanent ground fault.
4. An arc suppression system as claimed in claim 3, wherein: the active power unit is connected in series with the current sensor.
5. The arc suppression system of claim 3, wherein said active power cell is connected to said vector transformer through an isolation coil, wherein said isolation coil comprises a first coil and a second coil mutually inductive to said first coil, wherein a first end of said active power cell is connected to a first end of said second coil and a second end of said active power cell is connected to a second end of said second coil.
6. The arc suppression system according to any one of claims 3 to 5, further comprising:
the voltage sensor is respectively connected with the power distribution network and the measurement and control unit;
the measurement and control unit also 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.
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 active power unit adjusts the amplitude and angle of the compensation voltage accordingly, wherein,
the first end of the active power unit is connected with the second end of the secondary winding of the vector transformer, the second end of the active power unit is grounded,
the first end of the 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 the secondary winding of the vector transformer through a vector voltage selection switch, 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 according to claim 7, further comprising, before the active power unit adjusts the amplitude and angle of the compensation voltage accordingly:
the active power unit determines a first parameter corresponding to a current signal of the secondary winding fed back by a current sensor;
and the active power unit adjusts the amplitude and the angle of the compensation voltage according to the first parameter.
9. The method of claim 7, further comprising, after the active power unit adjusts the amplitude and angle of the compensation voltage accordingly: 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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| CN202010121696.9A CN111181145B (en) | 2020-02-26 | 2020-02-26 | Arc extinction system and method |
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| CN211266473U (en) * | 2020-02-26 | 2020-08-14 | 安徽一天电气技术股份有限公司 | Arc extinguishing system |
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2020
- 2020-02-26 CN CN202010121696.9A patent/CN111181145B/en active Active
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| DE102011082554A1 (en) * | 2011-09-12 | 2013-03-14 | H. Kleinknecht Gmbh & Co. Kg | Method for determination of earth leakage current in three-phase power supply network in e.g. house, involves determining fundamental oscillation component of earth leakage current by multiplication of portion of counter system with factor |
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