CN216598997U - Synchronous transient recording type single-phase earth fault management system - Google Patents
Synchronous transient recording type single-phase earth fault management system Download PDFInfo
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- CN216598997U CN216598997U CN202122029346.2U CN202122029346U CN216598997U CN 216598997 U CN216598997 U CN 216598997U CN 202122029346 U CN202122029346 U CN 202122029346U CN 216598997 U CN216598997 U CN 216598997U
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Abstract
The utility model discloses a synchronous transient recording type single-phase earth fault management system which comprises a back plate, a single-phase earth pulse line selection cabinet, a single-phase earth fault processing cabinet and a controller, wherein the single-phase earth pulse line selection cabinet and the single-phase earth fault processing cabinet are respectively arranged on one side of the back plate, the controller is fixedly installed on one side of the single-phase earth pulse line selection cabinet and comprises an ARIC synchronous single-phase earth fault management system, the ARIC synchronous single-phase earth fault management system comprises a nonlinear module, an IGBI trigger module and a PV module, and the nonlinear module, the IGBI trigger module and the PV module are respectively and electrically connected with the ARIC synchronous single-phase earth fault management system. The utility model discloses a, single-phase earth fault management system possesses the quick route selection of 100% rate of accuracy, and single-phase ground connection is synthesized the arc extinction and is harmony handled and functions such as the high-speed synchronous acquisition monitoring of electric wire netting and record ripples, is applicable to during the not direct grounding system of middling pressure power transmission and distribution neutral point, according to the different configurations of user's requirement, satisfies the on-the-spot requirement.
Description
Technical Field
The utility model relates to the technical field of circuit management, in particular to a synchronous transient recording type single-phase earth fault management system.
Background
In a 3-35 KV medium-voltage power transmission and distribution system, a mode that a neutral point is not directly grounded is mostly adopted, namely the neutral point is not grounded or is grounded through an arc suppression coil; a system with a neutral point not directly grounded is easy to generate high-voltage oscillation, so that various overvoltage is caused; typically in the form of an arc ground where the non-faulted phase line can rise up to 3.5 times the rated phase voltage to ground causing a flashover to ground where the system insulation is weak.
When the fault voltage monitoring device is applied to a system with a neutral point grounded through an arc suppression coil at present, an original line selection device based on a power direction line selection principle cannot be used, and the existing fault voltage monitoring device cannot really record and analyze transient overvoltage of arc light, thunder, operation and the like suffered by the system; therefore, we improve this and propose a synchronous transient recording type single-phase earth fault management system.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model discloses a synchronous transient recording type single-phase earth fault management system which comprises a back plate, a single-phase earth pulse line selection cabinet, a single-phase earth fault processing cabinet and a controller, wherein the single-phase earth pulse line selection cabinet and the single-phase earth fault processing cabinet are respectively arranged on one side of the back plate, the controller is fixedly installed on one side of the single-phase earth pulse line selection cabinet and comprises an ARIC synchronous single-phase earth fault management system, the ARIC synchronous single-phase earth fault management system comprises a nonlinear module, an IGBI trigger module and a PV module, and the nonlinear module, the IGBI trigger module and the PV module are respectively and electrically connected with the ARIC synchronous single-phase earth fault management system.
As a preferred technical scheme of the utility model, an isolation handcart is fixedly arranged on one side inside the single-phase grounding pulse line selection cabinet, one end of the isolation handcart is fixedly connected with a current-limiting fuse, and the isolation handcart and the current-limiting fuse are electrically connected in series.
As a preferred technical solution of the present invention, the current-limiting fuse is located at one side of a middle portion of the single-phase ground pulse line selection cabinet, and the current-limiting fuse is electrically connected in series with the PV module.
As a preferable technical solution of the present invention, a pulse arc suppression coil is fixedly disposed on the other side inside the single-phase ground pulse line selection cabinet, the pulse arc suppression coil is electrically connected to the IGBI trigger module, and the IGBI trigger module is electrically connected to the nonlinear module.
As a preferred technical solution of the present invention, a voltage transformer and a grounding transformer are fixedly disposed at one end inside the single-phase ground fault processing cabinet, a PT fuse and a circuit breaker are disposed above the inside of the single-phase ground fault processing cabinet, and the nonlinear module is located at one side of the single-phase ground fault processing cabinet.
As a preferred technical solution of the present invention, the nonlinear module is electrically connected in series with the grounding transformer, the grounding transformer is electrically connected with the PT fuse, the PT fuse is electrically connected with the voltage transformer, and the voltage transformer and the ARIC synchronous single-phase ground fault management system are electrically connected in series with each other.
As a preferred technical solution of the present invention, the isolation handcart may be used to disconnect the connection between the nonlinear module and the ARIC synchronous single-phase earth fault management system.
In a preferred embodiment of the present invention, the pulse arc suppression coil is used to compensate an inductive current generated by the arc suppression coil for a capacitance current at a fault point when an arc ground overvoltage occurs.
The utility model has the beneficial effects that: this kind of synchronous transient state record ripples type single-phase earth fault management system, the neutral point is not directly ground connection, when single-phase earth fault takes place for the system, single-phase earth fault management system possesses 100% accuracy's quick route selection, and functions such as arc extinction harmonic elimination processing and the high-speed synchronous collection of electric wire netting are synthesized to single-phase ground connection, monitor and record ripples have stronger commonality and flexibility, are applicable to in the neutral point of medium voltage transmission and distribution is not directly ground connection system, can assemble the configuration according to user's different system flexibility, satisfy the on-the-spot requirement.
The system has a real-time synchronous high-speed acquisition system, and can quickly and accurately break a system grounding loop. The system has a wireless communication function, data uploading cloud end, and synchronous real-time monitoring and management of the PC and the mobile phone APP; the method is suitable for a power grid with a neutral point not directly grounded and a cable line as a main part, and a hybrid power grid of cables and overhead lines.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic diagram of a main body of a synchronous transient recording type single-phase earth fault management system according to the present invention;
fig. 2 is a circuit diagram of a synchronous transient recording type single-phase earth fault management system according to the present invention;
fig. 3 is an internal schematic diagram of a single-phase ground pulse line selection cabinet of a synchronous transient recording type single-phase ground fault management system according to the present invention;
fig. 4 is a schematic diagram of the interior of a single-phase earth fault processing cabinet of a synchronous transient recording type single-phase earth fault management system according to the present invention.
In the figure: 1. a circuit breaker; 2. a grounding transformer; 3. a PT fuse; 4. a voltage transformer; 5. a non-linear module; 6. a triggering module; 7. a pulse arc suppression coil; 8. an isolation handcart; 9. a current limiting fuse; 10. a PV module; 11. a controller; 1101. an ARIC synchronous single-phase earth fault management system; 12. a single-phase grounding pulse line selection cabinet; 13. a single-phase earth fault processing cabinet; 14. a back plate.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example (b): as shown in fig. 1 and fig. 2, the synchronous transient recording type single-phase ground fault management system of the present invention includes a backplane 14, a single-phase ground pulse line selection cabinet 12, a single-phase ground fault processing cabinet 13, and a controller 11, wherein one side of the backplane 14 is respectively provided with the single-phase ground pulse line selection cabinet 12 and the single-phase ground fault processing cabinet 13, one side of the single-phase ground pulse line selection cabinet 12 is fixedly installed with the controller 11, the controller 11 includes an ARIC synchronous single-phase ground fault management system 1101, the ARIC synchronous single-phase ground fault management system 1101 includes a nonlinear module 5, an IGBI trigger module 6, and a PV module 10, the nonlinear module 5, the IGBI trigger module 6, and the PV module 10 are respectively electrically connected with the ARIC synchronous single-phase ground fault management system 1101, and when the single-phase ground fault occurs in the system, the main controller 11 detects a signal and then rapidly triggers the conduction of a thyristor, the main controller 11 acquires and compares zero sequence CT current waveforms of all outgoing line loops through the synchronous sampling unit, and determines a fault branch, a fault type, fault time, and the like. According to the nature of single-phase earth fault, earth fault management system adopts different working methods, transmits system operation data to customer' cloud TV little backstage management system backstage in real time, realizes remote communication, remote measurement, remote monitoring, cell-phone end APP.
The inside one side of single-phase ground pulse route selection cabinet 12 is fixed and is provided with isolation handcart 8, isolation handcart 8's one end fixedly connected with current limiting fuse 9, isolation handcart 8 and the mutual electric property series connection of current limiting fuse 9, through isolation handcart 8 for disconnection nonlinear resistor module is linked with the system, and establishes reliable insulating gap, separates the equipment or the circuit that will overhaul with an obvious disconnection point with the power, in order to guarantee the safety of maintainer and equipment.
The current-limiting fuse 9 is located one side of the middle part of the single-phase grounding pulse line selection cabinet 12, the current-limiting fuse 9 is electrically connected with the PV module 10 in series, the current-limiting fuse 9 is used for preventing short-circuit accidents, and when the normal operation is performed, the high-voltage current-limiting fuse 9 passes through working current, and the nonlinear resistor RV connected in parallel on the fuse is in a closed state. When short-circuit accidents occur, the current suddenly increases, the fuse fuses within 0.5ms, and quick cut-off is realized.
As shown in fig. 3 and 4, in the synchronous transient recording type single-phase ground fault management system according to the present invention, a pulse arc suppression coil 7 is fixedly disposed on the other side inside a single-phase ground pulse line selection cabinet 12, the pulse arc suppression coil 7 is electrically connected to an IGBI trigger module 6, and the IGBI trigger module 6 is electrically connected to a nonlinear module 5. Through IGBI trigger module 6, when the system breaks down and controller 11 detects the ground signal, trigger the silicon controlled rectifier to switch on rapidly, control the trouble branch road and flow a controllable pulse current of size. Through the pulse arc suppression coil 7, when arc grounding overvoltage occurs, the inductive current generated by the arc suppression coil compensates the capacitance current of the fault point, so that residual current flowing through the current of the fault point is reduced, natural arc suppression is achieved, and the purpose of further expanding and even eliminating the overvoltage is prevented.
The voltage transformer 4 and the grounding transformer 2 are fixedly arranged at one end inside the single-phase ground fault processing cabinet 13, the PT fuse 3 and the circuit breaker 1 are arranged above the inside of the single-phase ground fault processing cabinet 13, the nonlinear module 5 is positioned at one side of the single-phase ground fault processing cabinet 13, and the main circuit breaker 1 can be rapidly disconnected when a main circuit of a switching device which can close, bear and open current under the normal circuit condition and can close, bear and open current under the abnormal circuit condition within a specified time happens to the main circuit and the grounding fault through the circuit breaker 1, so that the protection effect is achieved.
According to the utility model, through the voltage transformer 4, a high voltage is converted into a low voltage in the power system of the high voltage transformer for detecting the system voltage and protecting signal acquisition and use, and the fault reason in the system is analyzed; through the PT fuse 3, the wires in the circuit have the maximum current allowed by the PT fuse, if the maximum current is exceeded, the wires are overheated to burn out insulation and even cause fire, in order to avoid the accident, a fuse wire with a lower melting point is connected in series in the circuit, and when an overlarge current flows, the fuse wire generates more heat to enable the temperature of the fuse wire to reach the melting point quickly, so that the fuse wire is fused, and the circuit is automatically cut off to play a role in safety; through the nonlinear module 5, the system has the reliability of power supply in an ungrounded mode in normal operation, if the system is in fault and is immediately conducted, the system overvoltage is limited, the resonance energy is quickly absorbed, the grounding charge energy is absorbed, and the system overvoltage level is limited within an insulation allowable range.
Nonlinear module 5 and grounding transformer 2 electrical property series connection, grounding transformer 2 and PT fuse 3 electrical connection, PT fuse 3 and voltage transformer 4 electrical connection, voltage transformer 4 and ARIC synchronous single-phase earth fault management system 1101 mutual electrical property series connection, through grounding transformer 2, the effect is that an artificial neutral point is provided for the ungrounded system of neutral point, the grounding mode of being convenient for to adopt, to ground capacitance current size when reducing the distribution network and taking place ground short circuit fault, improve distribution system's power supply reliability. Through the voltage transformer 4, the high voltage in the power system of the high-voltage transformer is converted into the low voltage for detecting the system voltage and protecting signal acquisition and use, and the fault reason in the system is analyzed.
The isolation trolley 8 may be used to disconnect the non-linear module 5 from the ARIC synchronous single phase earth fault management system 1101. The pulse arc suppression coil 7 can be used for compensating the capacitance current of a fault point by the inductive current generated by the arc suppression coil when arc grounding overvoltage occurs.
In a system with a neutral point not directly grounded, the synchronous transient recording type single-phase grounding fault management system leads out a neutral point through a grounding transformer, and the neutral point is connected with the high-voltage silicon controlled rectifier in series and then is connected with the ground. When a single-phase earth fault occurs in a certain branch of the system, the main controller 11 detects an earth signal and then rapidly triggers the conduction of the silicon controlled rectifier, a pulse current with controllable magnitude flows through the fault branch, and the main controller 11 acquires and compares zero sequence CT current waveforms of all outgoing line loops through the synchronous sampling unit to judge the fault branch, the fault type, the fault time and the like.
According to the nature of single-phase earth fault, the earth fault management system adopts different working modes, and the arc suppression coil and the vacuum contactor are mutually matched and protected, so that the reliability and the safety of system power supply are improved. When the system has single-phase earth fault, the earth fault management system completes the connection and then starts the fault phase vacuum contactor quickly, the vacuum contactor transfers the high-frequency earth capacitance current flowing through the fault point, eliminates the system arc overvoltage, and then tunes the arc suppression coil to disconnect the fault phase vacuum contactor.
In the opening process of the vacuum contactor, the arc suppression coil compensates the system grounding capacitance current, the system grounding capacitance current is prevented from flowing through a fault point again, the fault branch, particularly a cable branch, is prevented from being upgraded to an interphase short circuit accident from a single-phase grounding fault, and meanwhile, the operation overvoltage generated when the vacuum contactor is opened can be effectively prevented.
If the insulation of the fault point is recovered, the system recovers normal operation, and the ground fault management system exits the arc suppression coil; if the insulation of the fault point is not recovered, the grounding fault management system rapidly starts the fault phase vacuum contactor again to transfer the current of the fault point, then quits the arc suppression coil, and ensures that the system supplies power for 2 hours.
Meanwhile, the main controller 11 records, processes and analyzes the voltage waveform of the power system in a fault state and when the power system is subjected to impact of thunder, operation, ground fault and the like and the current waveforms of all loops completely, and uploads the voltage waveform to a background of a cloud television and a user mobile phone end APP. And a user can search and process the fault in time when the fault occurs to recover power supply, and the working state of the power system is further analyzed after the fault occurs. The system meets the requirement of unattended power transformation.
Finally, it should be noted that: in the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. 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 (8)
1. A synchronous transient recording type single-phase earth fault management system comprises a back panel (14), a single-phase earth pulse line selection cabinet (12), a single-phase earth fault processing cabinet (13) and a controller (11), it is characterized in that one side of the back plate (14) is respectively provided with a single-phase grounding pulse line selection cabinet (12) and a single-phase grounding fault processing cabinet (13), a controller (11) is fixedly arranged on one side of the single-phase grounding pulse line selection cabinet (12), the controller (11) comprises an ARIC synchronous single-phase earth fault management system (1101), the ARIC synchronous single-phase earth fault management system (1101) comprises a nonlinear module (5) and an IGBI trigger module (6), and the PV module (10), the nonlinear module (5), the IGBI trigger module (6) and the PV module (10) are respectively electrically connected with the ARIC synchronous single-phase earth fault management system (1101).
2. The synchronous transient recording type single-phase earth fault management system according to claim 1, wherein an isolation handcart (8) is fixedly arranged on one side of the inside of the single-phase earth pulse line selection cabinet (12), a current-limiting fuse (9) is fixedly connected to one end of the isolation handcart (8), and the isolation handcart (8) and the current-limiting fuse (9) are electrically connected in series.
3. The synchronized transient recording single-phase earth fault management system of claim 2, wherein said current limiting fuse (9) is located on the side of the middle of said single-phase earth pulse line selection cabinet (12), said current limiting fuse (9) being electrically connected in series with said PV module (10).
4. The synchronized transient recording type single-phase ground fault management system of claim 1, wherein a pulse arc suppression coil (7) is fixedly arranged at the other side inside the single-phase ground pulse line selection cabinet (12), the pulse arc suppression coil (7) is electrically connected with the IGBI trigger module (6), and the IGBI trigger module (6) is electrically connected with the nonlinear module (5).
5. The synchronous transient recording type single-phase earth fault management system of claim 1, wherein a voltage transformer (4) and an earth transformer (2) are fixedly arranged at one end of the interior of the single-phase earth fault processing cabinet (13), a PT fuse (3) and a circuit breaker (1) are arranged above the interior of the single-phase earth fault processing cabinet (13), and the nonlinear module (5) is positioned at one side of the single-phase earth fault processing cabinet (13).
6. The synchronous transient recording type single-phase earth fault management system of claim 5, wherein the nonlinear module (5) is electrically connected in series with the grounding transformer (2), the grounding transformer (2) is electrically connected with the PT fuse (3), the PT fuse (3) is electrically connected with the voltage transformer (4), and the voltage transformer (4) and the ARIC synchronous single-phase earth fault management system (1101) are electrically connected in series with each other.
7. A synchronized transient recording type single-phase earth fault management system according to claim 2, characterized in that the isolation trolley (8) is operable to disconnect the nonlinear module (5) from the ARIC synchronized single-phase earth fault management system (1101).
8. A synchronous transient recording type single-phase earth fault management system as claimed in claim 4, characterized in that said pulse arc suppression coil (7) is used to compensate the capacitance current of fault point by the inductive current generated by arc suppression coil when arc ground overvoltage occurs.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121325967 | 2021-06-15 | ||
| CN2021213259679 | 2021-06-15 |
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| CN216598997U true CN216598997U (en) | 2022-05-24 |
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| CN202122029346.2U Active CN216598997U (en) | 2021-06-15 | 2021-08-26 | Synchronous transient recording type single-phase earth fault management system |
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