CN112670971B - Single-phase earth fault comprehensive treatment system - Google Patents
Single-phase earth fault comprehensive treatment system Download PDFInfo
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- CN112670971B CN112670971B CN202011479504.8A CN202011479504A CN112670971B CN 112670971 B CN112670971 B CN 112670971B CN 202011479504 A CN202011479504 A CN 202011479504A CN 112670971 B CN112670971 B CN 112670971B
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Abstract
The application discloses a single-phase earth fault comprehensive treatment system, which is characterized in that: the grounding transformer leads out a neutral point and is connected with the ground through a monostable switch, the zero sequence current transformer is arranged on each branch, the outgoing line loop of each branch is connected with the synchronous sampling unit through a zero sequence current synchronous sampling channel, the unidirectional vacuum contactor is connected with the main road after being connected with the high-voltage current limiting fuse and the arc suppression equipment isolating switch in series, the unidirectional vacuum contactor is connected with the neutral point after being electrically connected with the pulse arc suppression coil, the PT fuse is connected with the synchronous sampling unit and the grounding transformer after being connected with the voltage transformer in series, the synchronous sampling unit is connected with the main controller, and the main controller is connected with the background monitor and the mobile terminal; the application utilizes the mutual coordination of the unidirectional vacuum contactor and the pulse arc suppression coil to mutually protect, improves the safety and reliability of power supply of the system, and synthesizes arc suppression and resonance elimination treatment by single-phase grounding and high-speed synchronous acquisition, monitoring and wave recording of the power grid.
Description
Technical Field
The application relates to the technical field of safe electricity utilization, in particular to a single-phase grounding fault comprehensive treatment system.
Background
In 3-35KV medium voltage power transmission and distribution systems in China, most of the medium voltage power transmission and distribution systems adopt a mode that neutral points are not directly grounded, namely the neutral points are not grounded or are grounded through arc suppression coils. The neutral point is not directly grounded, and under the single-phase grounding state, the system line voltage can still keep three-phase symmetry without affecting the normal operation of the electric equipment. Therefore, the power supply reliability of the power transmission and distribution system adopting the mode that the neutral point is not directly grounded is far higher than that of the power transmission and distribution system adopting the mode that the neutral point is directly grounded, which is the greatest advantage of the mode that the neutral point is not directly grounded and is the basic reason why China persists in using the grounding mode in the medium-voltage power transmission and distribution system for a long time. However, from many years of operation experience and recent development of medium voltage power transmission and distribution systems, the neutral point is not directly grounded, which also causes problems for the medium voltage power transmission and distribution systems: high voltage oscillations are easily generated in a system in which the neutral point is not directly grounded, thereby causing various overvoltage.
When a single-phase earth fault occurs in a system in which the neutral point is not directly grounded, it is generally in the form of arc grounding. At this time, the voltage of the non-fault phase line to the ground can be raised to 3.5 times the rated phase voltage at the highest. Such overvoltages throughout the system tend to cause flashovers to ground at system insulation weaknesses. Meanwhile, the grounding arc is easy to burn the line insulation at the grounding, particularly the cable line, the grounding arc is easy to burn through the inter-phase insulation of the cable to cause inter-phase short circuit of the cable, the cable blasting is caused, and in addition, in the arc grounding process, the system is caused to generate intense electromagnetic oscillation by the change of electromagnetic parameters of the system. In the vibration process, the charge and discharge current of the system capacitor to the ground can form a loop through the neutral point of the voltage transformer in the system when the arc is extinguished and the fault is eliminated. The current is often far greater than the rated current of the voltage transformer, so that the iron core of the transformer is saturated, the primary side current is increased sharply, the fuse of the voltage transformer is fused, and even the voltage transformer is burned out; it is difficult to determine the branch that has a single-phase earth fault. When a single-phase grounding fault occurs in the system, the single-phase grounding fault line selection device based on the small-current line selection principle in the current market collects the magnitude and direction of zero-sequence capacitance current flowing through each branch and determines the branch with the single-phase grounding fault through different analysis methods. When the device is applied to a system with a neutral point grounded through an arc suppression coil, the original line selection device based on the power direction line selection principle cannot be used.
The existing fault voltage monitoring device can not truly record and analyze transient overvoltage such as arc light, electricity and operation suffered by a system.
In order to solve the problems, the application develops a comprehensive treatment system based on the grounding fault, and when a single-phase grounding fault occurs in a neutral point indirect grounding system, the comprehensive treatment system for the grounding fault has the rapid line selection with 100% accuracy, the single-phase grounding comprehensive arc extinction harmonic elimination treatment and the high-speed synchronous acquisition monitoring and wave recording of a power grid.
Disclosure of Invention
The application mainly aims to provide a single-phase earth fault comprehensive treatment system which can effectively solve the problems in the background technology.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows: a single-phase earth fault comprehensive processing system is characterized in that: the intelligent transformer comprises a main controller, a synchronous sampling unit, zero sequence current transformers, grounding transformers, a main transformer, grounding transformer isolating switches, arc suppression equipment isolating switches, high-voltage current limiting fuses, unidirectional vacuum contactors, pulse arc suppression coils, monostable switches, PT fuses and voltage transformers, wherein a neutral point is led out of the grounding transformers and is connected with the ground through the monostable switches, the zero sequence current transformers are arranged on all branches, outgoing loops of all the branches are connected with the synchronous sampling units through zero sequence current synchronous sampling channels, the unidirectional vacuum contactors are connected with the main trunk after being connected with the high-voltage current limiting fuses and the arc suppression equipment isolating switches in series, the unidirectional vacuum contactors are connected with the neutral point after being electrically connected with the pulse arc suppression coils, the grounding transformers are connected with the main transformer through the grounding transformer isolating switches, the PT fuses are connected with the synchronous sampling units and the grounding transformers after being connected with the voltage transformers in series, the synchronous sampling units are connected with the main controller, the main controller is connected with a background monitor and a mobile terminal, and the main controller is connected with an established cloud database.
Preferably, the main controller is provided with an RS485 communication interface, is provided with a standard MODBUS communication protocol and is connected with the monitoring system, so that data transmission is realized.
Preferably, the main controller adopts a 32-bit high-performance double CPU and a 7-inch wide-screen industrial color liquid crystal touch display screen, and is provided with a window voltage fault recording analysis system.
Preferably, the main controller can synchronously collect 24 channel currents and voltages at a high speed at a rate of 12.8 k.
Preferably, the pulse arc suppression coil can supplement system ground capacitance current and suppress system overvoltage.
Preferably, the monostable switch comprises an insulating shell and an external shell, a vacuum arc-extinguishing chamber is arranged in the insulating shell, a movable conducting rod and a fixed conducting rod are respectively arranged in the vacuum arc-extinguishing chamber, the ends of the movable conducting rod and the fixed conducting rod are respectively connected with a movable contact and a fixed contact, the movable conducting rod is positioned at the outer end of the vacuum arc-extinguishing chamber and is fixedly connected with a connecting rod through an insulator, the lower end of the connecting rod is fixedly connected with an eddy current disc, the end face of the eddy current disc is close to a closing coil, the closing coil is arranged on the external shell, a tension plate is fixedly connected with an outer ring of the connecting rod, the tension plate is connected with a support plate through a reset spring, the support plate is fixedly connected with the external shell, and the side wall of the movable conducting rod is electrically connected with a flexible conducting wire.
Compared with the prior art, the application has the beneficial effects that: according to the application, a neutral point is led out through the grounding transformer, the neutral point is grounded through the monostable switch, when a single-phase grounding fault occurs, the main controller can rapidly trigger the monostable switch to perform current conversion, rapidly judge a fault branch, mutually cooperate with the pulse arc suppression coil by utilizing the unidirectional vacuum contactor, mutually protect the single-phase vacuum contactor and the pulse arc suppression coil, improve the safety and reliability of power supply of the system, and realize single-phase grounding comprehensive arc suppression and resonance elimination treatment and high-speed synchronous acquisition monitoring and wave recording of the power grid.
Drawings
FIG. 1 is a schematic diagram of the overall system of the present application;
FIG. 2 is a schematic diagram of overall system data delivery according to the present application;
fig. 3 is a schematic cross-sectional view of a monostable switch of the present application.
In the figure: 1. a main controller; 2. a synchronous sampling unit; 3. a zero sequence current transformer; 4. a grounding transformer; 5. a main transformer; 6. a grounding change isolating switch; 7. an arc extinction device isolating switch; 8. a high voltage current limiting fuse; 9. a unidirectional vacuum contactor; 10. pulse arc suppression coil; 11. a monostable switch; 111. an insulating case; 112. a vacuum arc extinguishing chamber; 113. a movable conductive rod; 114. a fixed conducting rod; 115. a moving contact; 116. a fixed contact; 117. a vortex plate; 118. a closing coil; 119. a connecting rod; 1110. a return spring; 1111. a support plate; 1112. an external shell; 1113. an insulator; 1114. a tension plate; 1115. a flexible conductive line; 12. PT fuse; 13. a voltage transformer; 14. a background monitor; 15. a moving end; 16. and (5) a cloud database.
Description of the embodiments
The application is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the application easy to understand.
As shown in fig. 1-3, a single-phase earth fault integrated processing system is characterized in that: the intelligent transformer comprises a main controller 1, a synchronous sampling unit 2, a zero sequence current transformer 3, a grounding transformer 4, a main transformer 5, a grounding transformer isolating switch 6, an arc suppression device isolating switch 7, a high-voltage current limiting fuse 8, a unidirectional vacuum contactor 9, a pulse arc suppression coil 10, a monostable switch 11, a PT fuse 12 and a voltage transformer 13, wherein the grounding transformer 4 is led out of a neutral point and is connected with the ground through the monostable switch 11, the zero sequence current transformer 3 is arranged on each branch, an outgoing line loop of each branch is connected with the synchronous sampling unit 2 through a zero sequence current synchronous sampling channel, the unidirectional vacuum contactor 9 is connected with the main trunk after being connected with the high-voltage current limiting fuse and the arc suppression device isolating switch in series, the grounding transformer 4 is connected with the main transformer 5 through the grounding transformer isolating switch 6, the PT fuse is connected with the voltage transformer 13 in series and then is connected with the synchronous sampling unit 2 and the grounding transformer 4, the synchronous sampling unit 2 is connected with the main controller 1, the unidirectional vacuum contactor 9 is connected with a main controller 14 and a rear end monitor platform 1 and a data base 16, and a cloud base is established between the main controller 1 and the main controller and the monitoring platform and the data base 16.
When a certain branch of the system has a grounding fault, the main controller 1 rapidly triggers the monostable switch 11 after detecting the grounding signal, the fault branch flows through a half-wave current with controllable size with the same phase of the system, the main controller 1 collects and compares the current waveforms of the zero sequence current transformers 3 of all branch outlet loops through the synchronous sampling unit 2, judges the fault branch, the fault type and the fault time, adopts different working modes according to the grounding fault property, utilizes the mutual matching of the pulse arc suppression coil 10 and the unidirectional vacuum contactor 9 to mutually protect, improves the reliability and the safety of power supply of the system, when the unidirectional grounding fault occurs, the main controller 1 rapidly starts the vacuum contactor of the fault phase after finishing line selection, the vacuum contactor transfers high-frequency grounding capacitor current flowing through the fault point, eliminates the arc overvoltage of the system, then tunes the pulse arc suppression coil 10, cuts off the vacuum contactor of the fault phase, and supplements the grounding capacitor current of the system in the opening process of the vacuum contactor, thereby preventing the fault branch from being converted into the interphase short-circuit accident by the unidirectional grounding fault, and effectively preventing the vacuum contactor from being opened to generate the overvoltage during the opening operation; if the fault point is insulated and recovered, the system operates normally, the whole system exits the pulse arc suppression coil 10, if the fault point is not recovered, the whole system rapidly starts the fault phase vacuum contactor again to transfer the fault point current, and then the pulse arc suppression coil 10 is started, so that the continuous power supply of the system is ensured for 2 hours. Meanwhile, the main controller 1 completely records, analyzes and processes the fault state of the power system, the voltage waveform when the power system is impacted by lightning, operation, grounding faults and the like, and the current waveforms of all loops, and uploads the voltage waveforms and the current waveforms to the cloud database and the mobile terminal 15, so that a user can conveniently find and process the fault in time when the fault occurs to recover power supply, and further analyze the working state of the power system after the fault occurs, and avoid the fault from happening again.
In this embodiment, the main controller 1 is provided with an RS485 communication interface, and is connected with a monitoring system by a standard MODBUS communication protocol, so as to realize data transmission.
In this embodiment, the main controller 1 adopts a 32-bit high-performance dual CPU, a 7-inch wide-screen industrial color liquid crystal touch display screen, and has a windowed voltage fault recording analysis system.
In this embodiment, the main controller 1 can synchronously collect 24 channel currents and voltages at a high speed at a rate of 12.8 k.
In this embodiment, the pulse arc suppression coil 10 can supplement the capacitor current of the system ground and suppress the overvoltage of the system.
In this embodiment, the monostable switch 11 includes an insulating shell 111 and an external shell 1112, a vacuum arc extinguishing chamber 112 is installed in the insulating shell 111, a movable conductive rod 113 and a fixed conductive rod 114 are installed in the vacuum arc extinguishing chamber 112, the ends of the movable conductive rod 113 and the fixed conductive rod 114 are respectively connected with a movable contact 115 and a fixed contact 116, the end of the movable conductive rod 113 outside the vacuum arc extinguishing chamber 112 is fixedly connected with a connecting rod 119 through an insulator 1113, the lower end of the connecting rod 119 is fixedly connected with an eddy current disc 117, the end surface of the eddy current disc 117 is close to a closing coil 118, the closing coil 118 is installed on the external shell 1112, an outer ring of the connecting rod 119 is fixedly connected with a tension plate 1114, the tension plate 1114 is connected with a support plate 1111 through a return spring 1110, the support plate 1111 is fixedly connected with the external shell 1112, and the side wall of the movable conductive rod 113 is electrically connected with a soft conductive wire 1115.
While certain exemplary embodiments of the present application have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the application, which is defined by the appended claims.
Claims (5)
1. A single-phase earth fault comprehensive processing system is characterized in that: the intelligent transformer comprises a main controller, a synchronous sampling unit, zero sequence current transformers, grounding transformers, a main transformer, a grounding transformer isolating switch, arc suppression equipment isolating switches, high-voltage current limiting fuses, unidirectional vacuum contactors, pulse arc suppression coils, monostable switches, PT fuses and voltage transformers, wherein the grounding transformers lead out a neutral point and are connected with the ground through the monostable switches;
the monostable switch comprises an insulating shell and an external shell, a vacuum arc-extinguishing chamber is arranged in the insulating shell, a movable conducting rod and a fixed conducting rod are respectively arranged in the vacuum arc-extinguishing chamber, the ends of the movable conducting rod and the fixed conducting rod are respectively connected with a movable contact and a fixed contact, the ends of the movable conducting rod, which are positioned outside the vacuum arc-extinguishing chamber, are fixedly connected with a connecting rod through an insulator, the lower end of the connecting rod is fixedly connected with an eddy current disc, the end face of the eddy current disc is close to a closing coil, the closing coil is arranged on the external shell, the outer ring of the connecting rod is fixedly connected with a tension plate, the tension plate is connected with a support plate through a reset spring, the support plate is fixedly connected with the external shell, and the side wall of the movable conducting rod is electrically connected with a soft conducting wire.
2. A single-phase earth fault integrated processing system as claimed in claim 1, wherein: the main controller is provided with an RS485 communication interface, is provided with a standard MODBUS communication protocol and is connected with the monitoring system, and data transmission is achieved.
3. A single-phase earth fault integrated processing system as claimed in claim 1, wherein: the main controller adopts a 32-bit high-performance double CPU, and a 7-inch wide-screen industrial color liquid crystal touch display screen is provided with a window voltage fault recording analysis system.
4. A single-phase earth fault integrated processing system as claimed in claim 1, wherein: the main controller can synchronously collect 24 channel currents and voltages at a high speed at a rate of 12.8 k.
5. A single-phase earth fault integrated processing system as claimed in claim 1, wherein: the pulse arc suppression coil can supplement the system grounding capacitance current and restrain the system overvoltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011479504.8A CN112670971B (en) | 2020-12-15 | 2020-12-15 | Single-phase earth fault comprehensive treatment system |
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| CN202011479504.8A CN112670971B (en) | 2020-12-15 | 2020-12-15 | Single-phase earth fault comprehensive treatment system |
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| CN112670971A CN112670971A (en) | 2021-04-16 |
| CN112670971B true CN112670971B (en) | 2023-12-08 |
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| CN116073345B (en) * | 2023-04-06 | 2023-06-16 | 安徽凯民电力技术有限公司 | Intelligent comprehensive grounding management system |
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2020
- 2020-12-15 CN CN202011479504.8A patent/CN112670971B/en active Active
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