CN115693630A - Mixed arc quenching system based on split winding and working method thereof - Google Patents
Mixed arc quenching system based on split winding and working method thereof Download PDFInfo
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Abstract
The invention discloses a mixed arc quenching system based on a split winding and a working method thereof, wherein the mixed arc quenching system based on the split winding comprises the following components: the device comprises a distribution transformer, an injection transformer, a grounding transformer, an isolation transformer, an inverter power supply, a first group of fast-switching switches and a second group of fast-switching switches. According to the invention, the distribution transformer is matched with the rapid switching switch, the neutral point voltage is clamped to the phase opposite to the fault phase voltage, the rapid suppression of the fault phase-to-ground voltage can be realized, and the power supply reliability is improved. The invention provides most of power to be compensated through the distribution transformer, can greatly reduce the capacity and the volume of the inverter power supply, can effectively reduce the cost of the mixed arc quenching system, and is more convenient for users to install. The invention solves the problem that the characteristic frequency signal of the existing mixed arc quenching system is difficult to inject, the injection current is not influenced by factors such as neutral point voltage and the like, and the current injection effect is improved.
Description
Technical Field
The invention relates to the technical field of power distribution network protection, in particular to a hybrid arc quenching system based on split windings and a working method thereof.
Background
The power distribution network goes deep into the user terminal, the operation mode is changeable, and single-phase earth faults occur most frequently. Statistical data show that the single-phase earth fault of 10kV power distribution network in China accounts for more than 80% of all faults. The neutral point grounding mode is an important ring for ensuring the safe and stable operation of the power distribution network, and is related to personal safety, equipment insulation safety and power supply reliability. When the single-phase earth fault occurs to the power distribution network, the line voltage still keeps symmetrical, and the power supply to the load and the normal work of power equipment are not influenced, so that the medium-low voltage power distribution network in China generally allows the system to continue to operate for 1 to 2h after the single-phase earth fault occurs to improve the power supply reliability. Because the neutral point is grounded through the arc suppression coil, inductive current generated by the arc suppression coil and capacitive current of a power grid are utilized to cancel each other out, and short-circuit current which finally flows into a grounding fault point is greatly reduced, so that the electric arc is automatically extinguished, the probability of insulation breakdown and tripping caused by single-phase grounding fault is reduced, and the neutral point is a main grounding mode of a medium-low voltage power distribution network in China.
However, with the continuous development of economic society, the demand of China on electric power is increased rapidly, and the scale and the structure of the power distribution network are changed continuously, so that the existing grounding mode that the neutral point is grounded through the arc suppression coil cannot adapt to the development of the power distribution network gradually. Firstly, the use of a large amount of power cables in an urban distribution network leads to a rapid increase of capacitance current, and after the 10% overcompensation arc suppression coil is adopted for compensation, the overcompensation current at a fault point is increased more and more. Meanwhile, due to the large-scale use of power electronic equipment and nonlinear loads in a power distribution network, harmonic components contained in grounding current cannot be ignored. In addition, the arc suppression coil can only compensate the reactive component in the grounding current, and cannot act on the active component. The three points jointly result in that the residual current amplitude of a fault point is large enough to reignite the electric arc after a single-phase earth fault occurs in the power distribution network with the neutral point grounded through the arc suppression coil. The cable trench fire accident caused by the ground fault of the urban power distribution network and the mountain fire accident caused by the ground fault of the rural power network are frequent, and are one of the hidden troubles of safe operation of the power network in recent years.
With the rapid development of power electronic technology in recent years, the capacity of power electronic equipment is continuously increased and the cost is increasingly reduced, and a control technology for zero sequence voltage or fault point residual current of a power distribution network is realized by injecting current to a neutral point of the power distribution network by using a power electronic device, namely, an active arc extinction technology is rapidly developed. The active arc suppression technology can be divided into active voltage arc suppression and active current arc suppression according to different control targets. The active voltage arc extinction does not need to calculate the ground parameter of the system, and the voltage of the fault phase bus is controlled to be zero; the active current arc extinction calculates a compensation current instruction according to the system parameter, the low-resistance remote fault can well compensate the fault current, and the compensation effect depends on the accuracy of the system parameter measurement.
In patent publication No. CN114024298A, a distribution transformer and an isolation transformer are connected in series and then connected to the low-voltage side of an injection transformer, and the output voltage of the inverter power supply is greatly affected by the neutral point voltage and the line capacitance current, and the injection effect is not good.
Disclosure of Invention
The invention aims to solve the technical problem of providing a split winding-based hybrid arc quenching system which has good injection effect and ensures that the injection current is not influenced by the neutral point voltage.
In order to solve the above problems, the present invention provides a hybrid arc quenching system based on split windings, comprising:
the transformer comprises a distribution transformer, an injection transformer, a grounding transformer, an isolation transformer, an inverter power supply, a first group of rapid on-off switches and a second group of rapid on-off switches, wherein the first group of rapid on-off switches comprise rapid on-off switches k a1 Quick switching switch k b1 And a fast switching switch k c1 The second group of fast switching switches comprises a fast switching switch k a2 Quick switching switch k b2 And a fast switching switch k c2 The low-voltage side of the injection transformer is provided with a first split winding and a second split winding;
the first input end of the distribution transformer is connected with a distribution network bus A, the second input end of the distribution transformer is connected with a distribution network bus B, and the third input end of the distribution transformer is connected with a distribution network bus C; the first output end of the distribution transformer passes through a fast switching switch k a1 Connected with the first end of the first split winding and further connected via a fast switch k a2 A second end of the first split winding is connected; the second output end of the distribution transformer passes through a fast switching switch k b1 Connected with the first end of the first split winding and further connected with the first split winding through a fast switching switch k b2 A second split winding connected to a second end of the first split winding; the third output end of the distribution transformer passes through a fast switching switch k c1 Connected with the first end of the first split winding and further connected via a fast switch k c2 A second end of the first split winding is connected;
the output end of the inverter power supply is connected with the high-voltage side of the isolation transformer, the low-voltage side of the isolation transformer is connected with the second split winding, the high-voltage side of the injection transformer is connected with a distribution network neutral point N, three input ends of the grounding transformer are respectively connected with a distribution network bus A phase, a distribution network bus B phase and a distribution network bus C, three output ends of the grounding transformer are connected with the distribution network neutral point N, and the distribution network neutral point N is grounded through an arc suppression coil;
the inverter is used for generating a characteristic frequency current signal when the power distribution network has a ground fault; the distribution transformer is used for generating line voltage with a 30-degree difference with the power supply voltage of the distribution network, and clamping neutral point voltage as the opposite number of the fault phase voltage by switching corresponding fast-switching switches; the injection transformer is used for injecting compensation current to the system through a neutral point of the power distribution network.
As a further improvement of the invention, the inverter power supply further comprises a calculation unit, when a single-phase earth fault occurs in the power distribution network, the inverter power supply generates a characteristic frequency current signal, the calculation unit calculates the ground capacitance and the transition resistance of the power distribution network according to the characteristic frequency component in the zero sequence current of the system and the characteristic frequency component in the neutral point voltage, and calculates the compensation current according to the ground capacitance and the transition resistance of the power distribution network.
As a further improvement of the invention, the calculation unit calculates the earth capacitance and the transition resistance of the power distribution network according to the extracted characteristic frequency component in the zero sequence current of the system and the characteristic frequency component in the neutral point voltage, and the formula is as follows:
wherein ,
characteristic frequency components in the zero sequence current of the system;
is a characteristic frequency component in the neutral point voltage; j is an imaginary part; omega is angular velocity; c is a capacitance to ground; r f Is the transition resistance.
As a further improvement of the invention, the compensation current is calculated according to the earth capacitance and the transition resistance of the power distribution network, and the formula is as follows:
wherein ,Im Injecting compensation current into the system through a neutral point of the distribution network for the injection transformer; u shape c Is the fault phase power supply potential; r L A damping resistor is a branch of the arc suppression coil; l is p Is an arc suppression coil branch inductor. The distribution transformer is used for generating line voltage with a 30-degree difference with the power supply voltage of the distribution network, and the voltage of a neutral point is clamped as the phase opposite to the fault phase voltage by switching corresponding fast-switching switches. The actual injection current of the inverter power supply can be obtained by subtracting the injection current of the distribution transformer from the compensation current, and the distribution transformer provides most of the power to be compensated, so that the capacity of the inverter power supply is greatly reduced, the volume is reduced, and the cost is also reduced.
As a further improvement of the invention, the connection group of the grounding transformer is Zny11 or Zny1, and the connection group of the distribution transformer is Dyn11, dyn7, dyn3, dyn1, dyn5 or Dyn9.
As a further improvement of the present invention, the isolation transformer is a single-phase step-down transformer.
As a further improvement of the present invention, the injection transformer is a single-phase step-down transformer.
As a further improvement of the invention, the inverter power supply adopts a three-phase uncontrolled rectification input and a single-phase inversion output.
The invention also provides a working method of the hybrid arc quenching system based on the split winding, which is applied to the hybrid arc quenching system based on the split winding and comprises the following steps:
s1, monitoring three-phase voltage of a power distribution network when a system operates normally, judging whether a single-phase earth fault occurs, and selecting a phase after the single-phase earth fault occurs;
s2, the inverter power supply generates a characteristic frequency current signal, and the earth capacitance and the transition resistance of the power distribution network are calculated according to a characteristic frequency component in the zero sequence current of the system and a characteristic frequency component in the neutral point voltage;
s3, clamping neutral point voltage as an opposite number of the fault phase voltage by switching corresponding fast switching switches according to the phase selection result; calculating compensation current according to the ground capacitance and the transition resistance of the power distribution network, and injecting the compensation current into the system through a neutral point of the power distribution network to realize closed control of fault current;
s4, judging whether the single-phase earth fault of the power distribution network disappears or not; if the fault disappears, the system is withdrawn, the corresponding switch is cut off, and the inverter power supply is withdrawn; and if the fault does not disappear, alarming.
As a further improvement of the invention, in step S3, when the A phase grounding fault occurs in the power distribution network, the quick switching switch k is switched c1 And a fast switching switch k a2 (ii) a When the B phase grounding fault occurs in the power distribution network, the quick switching switch k is switched a1 And a fast switching switch k b2 (ii) a When the C phase grounding fault occurs in the power distribution network, the quick switching switch k is switched b1 And a fast switching switch k c2 。
The invention has the beneficial effects that:
the mixed arc quenching system based on the split winding clamps the neutral point voltage to the opposite number of the fault phase power supply potential through the matching of the distribution transformer and the quick switching switch, can realize the quick suppression of the fault phase-to-ground voltage, and improves the power supply reliability.
The mixed arc quenching system based on the split winding provides most of power to be compensated through the distribution transformer, so that the capacity and the volume of the inverter power supply can be greatly reduced, the cost of the mixed arc quenching system can be effectively reduced, and the mixed arc quenching system is more convenient for users to install.
The hybrid arc quenching system based on the split winding solves the problem that the characteristic frequency signal of the existing hybrid arc quenching system is difficult to inject, the injected current is not influenced by factors such as neutral point voltage, and the like, and the current injection effect is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a split winding based hybrid arc quenching system in an embodiment of the present invention;
fig. 2 is a zero sequence equivalent circuit diagram of a single-phase earth fault of the power distribution network in the embodiment of the invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As shown in fig. 1, the hybrid arc quenching system based on split winding in the embodiment of the present invention includes:
the power distribution transformer, the injection transformer, the grounding transformer, the isolation transformer, the inverter power supply, a first group of fast-switching switches and a second group of fast-switching switches, wherein the first group of fast-switching switches comprise fast-switching switches k a1 Quick switching switch k b1 And a fast switching switch k c1 The second group of fast switching switches comprises a fast switching switch k a2 And a fast switching switch k b2 And a fast switching switch k c2 And a first split winding and a second split winding are arranged on the low-voltage side of the injection transformer.
The first input end of the distribution transformer is connected with a distribution network bus A, the second input end of the distribution transformer is connected with a distribution network bus B, and the third input end of the distribution transformer is connected with a distribution network bus C; the first output end of the distribution transformer passes through a fast switching switch k a1 Connected with the first end of the first split winding and further connected via a fast switch k a2 A second split winding connected to a second end of the first split winding; the second output end of the distribution transformer is connected with a fast switching switch k b1 Connected with the first end of the first split winding and further connected with the first split winding through a fast switching switch k b2 A second split winding of the first split windingEnd connection; the third output end of the distribution transformer passes through a fast switching switch k c1 Connected with the first end of the first split winding and further connected via a fast switch k c2 Connected to the second end of the first split winding.
The output end of the inverter power supply is connected with the high-voltage side of the isolation transformer, the low-voltage side of the isolation transformer is connected with the second split winding, the high-voltage side of the injection transformer is connected with a distribution network neutral point N, three input ends of the grounding transformer are respectively connected with a distribution network bus A phase, a distribution network bus B phase and a distribution network bus C, three output ends of the grounding transformer are connected with the distribution network neutral point N, and the distribution network neutral point N is grounded through an arc suppression coil;
the inverter is used for generating a characteristic frequency current signal when the power distribution network has a ground fault; the distribution transformer is used for generating line voltage with a 30-degree difference with the power supply voltage of the distribution network, and clamping neutral point voltage as the phase opposite to the fault phase voltage by switching corresponding fast switching switches; the injection transformer is used for injecting compensation current to the system through a neutral point of the power distribution network.
wherein ,Ua Supply voltage, U, for phase A of the distribution network bus b For supply voltage, U, of the B phase of the bus of the distribution network c The power supply voltage of the C phase of the bus of the distribution network. r is A For the bus A of the distribution network against ground resistance, r B For the bus B of the distribution network against the ground resistance, r C The bus C of the distribution network is a relative ground resistance. c. C A For the distribution network bus A relative ground capacitance, c B For the bus B of the distribution network to earth capacitance, c C The bus C of the distribution network is relatively grounded. R f To transition resistance, I vsc Injecting current for the inverter.
Referring to fig. 2, which is a zero sequence equivalent circuit diagram of single-phase earth fault of the distribution network, I m For injecting a compensating current, U, into the system through the neutral point of the distribution network by a transformer N0 Is neutral point voltage, R L Damping resistor, L, for the branch of the arc-suppression coil P Inductance of arc suppression coil, C power distribution network capacitance to ground, R f Is transition resistance, U f Is a virtual equivalent power supply. When the single-phase earth fault occurs to the power distribution network, the virtual equivalent power supply U f The number of the series-writable equations is less than the number of unknown variables of the system, and the magnitude of the transition resistance cannot be directly calculated according to the voltage and the current of the neutral point, so that a characteristic frequency current signal is injected into the system through the inverter power supply, characteristic frequency components in the voltage of the neutral point and the zero sequence current of the system are extracted, and the virtual equivalent power supply U can not be considered f And further calculating the earth capacitance and the transition resistance of the power distribution network.
Furthermore, the hybrid arc quenching system based on the split winding in the embodiment of the invention further comprises a computing unit, when the power distribution network has a single-phase ground fault, the inverter power supply generates a characteristic frequency current signal, and the computing unit computes the ground capacitance and the transition resistance of the power distribution network according to a characteristic frequency component in the zero-sequence current of the system and a characteristic frequency component in the neutral point voltage, and computes the compensation current according to the ground capacitance and the transition resistance of the power distribution network.
Optionally, the calculation unit calculates the ground capacitance and the transition resistance of the power distribution network according to the characteristic frequency component in the zero-sequence current and the characteristic frequency component in the neutral point voltage of the system, and the formula is as follows:
wherein ,
characteristic frequency components in the zero sequence current of the system;
is a characteristic frequency component in the neutral point voltage; j is an imaginary part; omega is angular velocity; c is a capacitance to ground; r f Is the transition resistance.
Optionally, the compensation current is calculated according to the power distribution network ground capacitance and the transition resistance, and the formula is as follows:
wherein ,Im To compensate for the current; u shape c Is the fault phase power supply potential; r L A damping resistor is a branch of the arc suppression coil; l is a radical of an alcohol p Is an arc suppression coil branch inductor.
Optionally, the connection group of the grounding transformer is Zny11 or Zny1, and the connection group of the distribution transformer is Dyn11, dyn7, dyn3, dyn1, dyn5, or Dyn9.
Optionally, the isolation transformer is a single-phase step-down transformer, and the rated voltage transformation ratio is 600V/120V. The injection transformer is a single-phase step-down transformer, and the rated voltage transformation ratio is 6kV/400V.
Optionally, the inverter power supply adopts a three-phase uncontrolled rectification input and a single-phase inversion output, the output voltage is adjustable from 0V to 300V, and the rated capacity is 10kVA.
Another embodiment of the present invention provides a working method of a hybrid arc quenching system based on split windings, which is applied to the hybrid arc quenching system based on split windings, and includes the following steps:
s1, monitoring three-phase voltage of a power distribution network when a system normally operates, judging whether a single-phase earth fault occurs or not, and selecting a phase after the single-phase earth fault occurs;
s2, the inverter power supply generates a characteristic frequency current signal, and the earth capacitance and the transition resistance of the power distribution network are calculated according to a characteristic frequency component in the zero sequence current of the system and a characteristic frequency component in the neutral point voltage;
s3, clamping neutral point voltage as an opposite number of the fault phase voltage by switching corresponding fast-switching switches according to the phase selection result; calculating compensation current according to the earth capacitance and the transition resistance of the power distribution network, and injecting the compensation current into the system through a neutral point of the power distribution network to realize closed control of fault current;
s4, judging whether the single-phase earth fault of the power distribution network disappears or not; if the fault disappears, the system is withdrawn, the corresponding switch is cut off, and the inverter power supply is withdrawn; and if the fault does not disappear, alarming.
Wherein, in step S3, when matchingWhen A phase grounding fault occurs in the power grid, the quick switching switch k is switched c1 And a fast switching switch k a2 (ii) a When the B phase grounding fault occurs in the power distribution network, the quick switching switch k is switched a1 And a fast switching switch k b2 (ii) a When the C phase grounding fault occurs in the power distribution network, the quick switching switch k is switched b1 And a fast switching switch k c2 . After the fast switch is switched, the distribution transformer generates a line voltage which is 30 degrees different from the power supply voltage of the distribution network.
According to the invention, the neutral point voltage is clamped through the distribution transformer and the quick switching switch, so that the neutral point voltage opposite to the single-phase ground fault phase voltage is obtained. Aiming at the defect of poor arc quenching effect when the ground voltage of a control fault phase bus is low-resistance fault, the invention injects characteristic frequency current signals into the system through the inverter power supply to realize the real-time measurement of the ground capacitance and the transition resistance of the power distribution network, and realizes the closed-loop tracking control of the fault current by calculating the injection current of the inverter power supply.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitutions or changes made by the person skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A split winding based hybrid arc quenching system, comprising:
the transformer comprises a distribution transformer, an injection transformer, a grounding transformer, an isolation transformer, an inverter power supply, a first group of rapid on-off switches and a second group of rapid on-off switches, wherein the first group of rapid on-off switches comprise rapid on-off switches k a1 Quick switching switch k b1 And a fast switching switch k c1 The second group of fast switching switches comprises a fast switching switch k a2 Quick switching switch k b2 And a fast switching switch k c2 The low-voltage side of the injection transformer is provided with a first split winding and a second split winding;
the power distributionThe first input end of the transformer is connected with a distribution network bus A, the second input end of the distribution transformer is connected with a distribution network bus B, and the third input end of the distribution transformer is connected with a distribution network bus C; the first output end of the distribution transformer is connected with a fast switching switch k a1 Connected with the first end of the first split winding and further connected with the first split winding through a fast switching switch k a2 A second split winding connected to a second end of the first split winding; the second output end of the distribution transformer passes through a fast switching switch k b1 Connected with the first end of the first split winding and further connected with the first split winding through a fast switching switch k b2 A second end of the first split winding is connected; the third output end of the distribution transformer is connected with a fast switching switch k c1 Connected with the first end of the first split winding and further connected with the first split winding through a fast switching switch k c2 A second end of the first split winding is connected;
the output end of the inverter power supply is connected with the high-voltage side of the isolation transformer, the low-voltage side of the isolation transformer is connected with the second split winding, the high-voltage side of the injection transformer is connected with a distribution network neutral point N, three input ends of the grounding transformer are respectively connected with a distribution network bus A phase, a distribution network bus B phase and a distribution network bus C, three output ends of the grounding transformer are connected with the distribution network neutral point N, and the distribution network neutral point N is grounded through an arc suppression coil;
the inverter is used for generating a characteristic frequency current signal when the power distribution network has a ground fault; the distribution transformer is used for generating line voltage with a 30-degree difference with the power supply voltage of the distribution network, and the voltage of a neutral point is clamped as the opposite number of the potential of the fault phase power supply by switching a corresponding quick switching switch; the injection transformer is used for injecting compensation current to the system through a neutral point of the power distribution network.
2. The split-winding based hybrid arc quenching system as claimed in claim 1, further comprising a calculation unit, wherein the inverter power supply generates a characteristic frequency current signal when a single-phase ground fault occurs in the distribution network, the calculation unit calculates the distribution network ground capacitance and the transition resistance according to the characteristic frequency component in the system zero sequence current and the characteristic frequency component in the neutral point voltage, and calculates the compensation current according to the distribution network ground capacitance and the transition resistance.
3. The split winding based hybrid arc quenching system as claimed in claim 2, wherein the calculating unit calculates the distribution network capacitance to ground and the transition resistance according to the extracted characteristic frequency component in the zero sequence current of the system and the characteristic frequency component in the neutral point voltage, and the formula is as follows:
wherein ,
characteristic frequency components in the zero sequence current of the system;
is a characteristic frequency component in the neutral point voltage; j is an imaginary part; omega is angular velocity; c is the capacitance to ground; r f Is the transition resistance.
4. The split winding based hybrid arc quenching system as claimed in claim 3, wherein said calculating the compensation current based on the distribution network capacitance to ground and the transition resistance is done by the formula:
wherein ,Im To compensate for the current; u shape c Is the fault phase power supply potential; r L A damping resistor is a branch of the arc suppression coil; l is p Is arc suppression coil branch inductance.
5. The split-winding based hybrid arc quenching system according to claim 1, wherein the connection group of said grounding transformer is Zny11 or Zny1, and the connection group of said distribution transformer is Dyn11, dyn7, dyn3, dyn1, dyn5 or Dyn9.
6. The split winding based hybrid arc quenching system as claimed in claim 1, wherein said isolation transformer is a single phase step down transformer.
7. The split winding based hybrid arc quenching system as claimed in claim 1, wherein the injection transformer is a single phase step down transformer.
8. The split winding based hybrid arc quenching system as claimed in claim 1, wherein said inverter power supply employs a three-phase uncontrolled rectified input and a single-phase inverted output.
9. A method for operating a hybrid arc quenching system based on split winding, applied to the hybrid arc quenching system based on split winding according to any one of claims 1 to 8, comprising:
s1, monitoring three-phase voltage of a power distribution network when a system normally operates, judging whether a single-phase earth fault occurs or not, and selecting a phase after the single-phase earth fault occurs;
s2, the inverter power supply generates a characteristic frequency current signal, and the earth capacitance and the transition resistance of the power distribution network are calculated according to a characteristic frequency component in the zero sequence current of the system and a characteristic frequency component in the neutral point voltage;
s3, clamping neutral point voltage as the opposite number of the fault phase power supply potential by switching corresponding fast switching switches according to the phase selection result; calculating compensation current according to the earth capacitance and the transition resistance of the power distribution network, and injecting the compensation current into the system through a neutral point of the power distribution network to realize closed-loop control on fault current;
s4, judging whether the single-phase earth fault of the power distribution network disappears or not; if the fault disappears, the system is withdrawn, the corresponding switch is cut off, and the inverter power supply is withdrawn; and if the fault does not disappear, alarming.
10. The operating method of a hybrid arc-quenching system based on split windings according to claim 9, characterized in that in step S3, when a phase-a ground fault occurs in the distribution network, the fast-switching switch k is switched c1 And a fast switching switch k a2 (ii) a When the distribution network has a B-phase grounding fault, the quick-switching switch k is switched a1 And a fast switching switch k b2 (ii) a When the C phase grounding fault occurs in the power distribution network, the quick switching switch k is switched b1 And a fast switching switch k c2 。
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