CN212675072U

CN212675072U - Distributed fault line selection equipment

Info

Publication number: CN212675072U
Application number: CN202021025649.6U
Authority: CN
Inventors: 喻旻; 方小平; 涂志辉; 严诚
Original assignee: State Grid Jiangxi Electric Power Co ltd Yingtan Power Supply Branch; State Grid Corp of China SGCC
Current assignee: State Grid Jiangxi Electric Power Co ltd Yingtan Power Supply Branch; State Grid Corp of China SGCC
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-03-09
Anticipated expiration: 2030-06-05

Abstract

The utility model relates to a distributing type trouble route selection equipment, including installing the collection system who gathers the phase current on the overhead line head, still be provided with the zero sequence voltage monitoring devices of monitoring zero sequence voltage on the overhead line, be connected with the route selection decision device who is used for receiving on electric current collection system and the zero sequence voltage monitoring devices and send the wave form on the zero sequence voltage monitoring devices, route selection decision device and collection system communication are connected. From this, can realize installing synchronous zero sequence voltage monitoring devices in the station, install synchronous current collection system at overhead line head end, realize the cooperation inside and outside the station, solve traditional undercurrent device and installed in the transformer substation completely, need have a power failure to install, the actual problem that the installation maintenance degree of difficulty is big. The collecting device arranged outside the station can be limited to the outlet of the main outgoing line and can also be arranged at the outlet of the branch line, and fault line selection of the main line and the branch line can be realized through a layered line selection algorithm.

Description

Distributed fault line selection equipment

Technical Field

The utility model relates to a be applicable to overhead line trouble line selection equipment, especially relate to a distributing type trouble line selection equipment.

Background

In terms of the existing lines, particularly overhead lines, the distribution lines have multiple branches, long lines and complex topology. When short circuit or ground fault occurs, the fault must be isolated and removed as soon as possible, otherwise the power supply quality and efficiency are seriously affected, and even the problem of power supply safety is brought. For this reason, once a single-phase ground fault occurs in the medium-voltage distribution line, it is necessary to find out the faulty line and the fault point as soon as possible to isolate the fault. The traditional method is to judge whether a single-phase earth fault occurs by detecting the value of zero sequence voltage on a substation bus. If the earth fault occurs, judging which line has the fault by adopting a manual line-by-line switching-off method, and manually inspecting fault points along the line with the fault. The manual circuit pulling enables a normal circuit to have a short power failure, and the automatic reclosing after the brake pulling is unsuccessful results in longer power failure time. Meanwhile, the pull circuit can generate operation overvoltage and resonance overvoltage, so that the equipment is impacted again, insulation damage is caused, and the danger of accidents and the insulation burden of the equipment are increased.

Meanwhile, a line selection device of a low-current grounding system installed in a transformer substation is introduced to help realize quick selection of a fault line. However, the method is limited by difficult installation, depends on zero sequence CT of the transformer substation, is only installed at the head end of the outgoing line, and the judgment principle cannot adapt to various environments and other multiple factors, so that the actual operation effect is poor, and many users are caused to stop using.

In addition, the conventional line selection device is installed in a substation, and only a main line where a fault is located can be selected, and a section or a branch line where the fault is located cannot be further located, so that 'quick nearby isolation' cannot be realized.

In view of the above-mentioned drawbacks, the present designer actively makes research and innovation to create a distributed fault line selection device, so that the device has industrial utility value.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a distributing type trouble route selection equipment.

The utility model discloses a distributing type trouble route selection equipment, including installing in the collection system of overhead line head phase current of gathering, wherein: the overhead line is also provided with a zero sequence voltage monitoring device for monitoring zero sequence voltage, the zero sequence voltage monitoring device is connected with a line selection judgment device for receiving waveforms sent by the current acquisition device and the zero sequence voltage monitoring device, the line selection judgment device is in communication connection with the acquisition device,

the acquisition device comprises an acquisition device body, wherein a current induction module is installed on the acquisition device body, an analog-to-digital conversion module is arranged at the output end of the current induction module, a first storage module is arranged at the output end of the analog-to-digital conversion module, a current measurement module is arranged at the output end of the first storage module, a communication module is arranged at the output end of the current measurement module, a clock module is also connected to the acquisition device body, the energy supply ports of the modules are electrically connected with a first power supply module, and an energy taking module is connected to the first power supply module,

the zero sequence voltage monitoring device comprises a voltage monitoring device body, wherein an analog-digital conversion module is arranged on the voltage monitoring device body, a data preprocessing module is arranged at the output end of the analog-digital conversion module, a communication interface is arranged at the output end of the data preprocessing module, a clock module is also connected to the voltage monitoring device body, the energy supply ports of the modules are electrically connected with a second power supply module,

the line selection judgment device comprises a judgment device body, wherein a second storage module is arranged in the judgment device body, the input end of the second storage module is respectively connected with a wireless communication module and a first wired interface, the output end of the second storage module is connected with a line selection logic module, the output end of the line selection logic module is connected with a display module and a second wired interface, the judgment device body is further connected with a clock module, and the energy supply ports of the modules are electrically connected with a third power module.

Further, in the above-mentioned distributed fault line selection apparatus, the current sensing module in the acquisition device is a CT core sensing measurement component, the analog-to-digital conversion module is composed of a 16-bit low-power consumption analog-to-digital conversion chip AD7171 and an auxiliary circuit of the AD company in the united states, the first storage module is an external flash, the current measurement module is an STM32L4+ chip of the semiconductor company in the ideological act of the united states or an SAM9G45 chip of the elmel company, the communication module is a module of 909 ME909s-821 in hua, the clock module is a module of neon-M8 in ublox company, the first power module is composed of a power management chip TPS65043 and an auxiliary circuit of the TI company, and the energy obtaining module is a CT core sensing electricity-taking component.

Furthermore, in the above-mentioned distributed fault line selection apparatus, an analog-to-digital conversion module in the line selection decision device in the zero sequence voltage monitoring device is composed of a 16-bit low power consumption analog-to-digital conversion chip AD7171 and an auxiliary circuit of the american AD company, the data preprocessing module is an STM32L4+ chip of the american ideological semiconductor company or an SAM9G45 chip of the elmel company, the communication interface is a memory read or wired interconnection interface including one or more of a serial port, a parallel port, and a USB interface, the clock module is a neon-M8 module of the ublox company, and the second power module is mainly constructed by using an HDR 60-5 module of the haimingxi electric limited company.

Furthermore, in the above-mentioned distributed fault line selection device, the wireless communication module in the line selection decision apparatus is a module from hua shi ME909s-821 of hua shi corporation, the second storage module is a hard disk reading module, the line selection logic module is an SPEAr320 processor of ideological semiconductor, the display module is a common PCD display screen or a display interface, and the third power module is formed by adding an auxiliary circuit to a power management chip TPS65043 of TI corporation.

Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:

1. the synchronous zero sequence voltage monitoring device can be installed in a station, the synchronous current acquisition device is installed at the head end of an overhead line, the inside and outside cooperation of the station is realized, and the practical problems that the traditional small current device is completely installed in a transformer substation, power failure installation is needed, and the installation and maintenance difficulty is large are solved.

2. The collection device installed outside the substation can be limited to the outlet of the main outgoing line and can also be installed at the outlet of the branch line, fault line selection of the trunk and the branch line can be achieved through a layered line selection algorithm, and the defect that the original traditional line selection device can only be installed at the first section of a line in a transformer substation and cannot acquire branch line information is overcome.

3. The whole structure is simple, the manufacture is easy, and the implementation and the installation are convenient.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of a distributed fault routing apparatus in combination with a distribution line.

Fig. 2 is a schematic structural view of the collecting device.

Fig. 3 is a schematic structural diagram of a zero sequence voltage monitoring device.

Fig. 4 is a schematic structural diagram of a line selection decision device.

The meanings of the reference symbols in the drawings are as follows.

1 acquisition device and 2 zero sequence voltage monitoring device

3 line selection decision device 4 current induction module

5 analog-to-digital conversion module 6 first storage module

7 current measuring module 8 communication module

9 clock module 10 first power supply module

11 energy-taking module 12 data preprocessing module

13 communication interface 14 second power supply module

15 second memory module 16 wireless communication module

17 first wired interface 18 line selection logic module

19 display module 20 second wired interface

21 third power supply module

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

The distributed fault line selection equipment shown in fig. 1 to 4 comprises a collection device 1 which is installed on the head end of an overhead line and used for collecting phase current, and is characterized in that: and a zero sequence voltage monitoring device 2 for monitoring zero sequence voltage is also arranged on the overhead line. Meanwhile, the zero sequence voltage monitoring device 2 is connected with a line selection judgment device 3 for receiving waveforms sent by the current acquisition device 1 and the zero sequence voltage monitoring device 2, and the line selection judgment device 3 is in communication connection with the acquisition device 1, so that effective data feedback is realized. Particularly, the utility model discloses an acquisition device 1 including acquisition device 1 body, install current induction module 4 on the acquisition device 1 body, current induction module 4's output is provided with analog-to-digital conversion module 5, analog-to-digital conversion module 5's output is provided with first storage module 6, first storage module 6's output is provided with current measurement module 7, current measurement module 7's output is provided with communication module 8, still be connected with clock module 9 on the acquisition device 1 body, all with first power module 10 electric connection on the energy supply port of each module, be connected with on the first power module 10 and get ability module 11. And, zero sequence voltage monitoring devices 2 is including the voltage monitoring devices body, is provided with analog-to-digital conversion module 5 on the voltage monitoring devices body, and analog-to-digital conversion module 5's output is provided with data preprocessing module 12, and data preprocessing module 12's output is provided with communication interface 13, still is connected with clock module 9 on the voltage monitoring devices body, all with second power module 14 electric connection on the energy supply port of each module. Considering effective judgment, the line selection judgment device 3 comprises a judgment device body, a second storage module 15 is arranged in the judgment device body, the input end of the second storage module 15 is respectively connected with a wireless communication module 168 and a first wired interface 17, the output end of the second storage module 15 is connected with a line selection logic module 18, the output end of the line selection logic module 18 is connected with a display module 19 and a second wired interface 20, the judgment device body is also connected with a clock module 9, and the energy supply ports of the modules are electrically connected with a third power supply module 21.

In view of the preferred embodiment of the present invention, the current sensing module 4 of the acquisition device 1 is a CT core sensing measurement module, the analog-to-digital conversion module 5 is a 16-bit low power consumption analog-to-digital conversion chip AD7171 and an auxiliary circuit of the american AD company, the first storage module 6 is an external flash, the current measurement module 7 is an STM32L4+ chip of the american ideological semiconductor company or an SAM9G45 chip of the elmel company, and the communication module 8 is a 909 ME909s-821 module of the china company. During the actual use period, the ME909s-821 module can support 2G/3G.4G communication network of China Mobile, China Unicom and China telecom, and has better communication compatibility. Meanwhile, the clock module 9 used is a neon-M8 module from ublox. In consideration of effective positioning, the clock module 9 is built by taking a GPS/Beidou module as a core, the first power module 10 is formed by adding an auxiliary circuit to a power management chip TPS65043 of a TI company, and the energy taking module 11 is a CT iron core induction electricity taking assembly.

Further, the analog-to-digital conversion module 5 adopted by the zero-sequence voltage monitoring device 2 can also be formed by using a 16-bit low-power consumption analog-to-digital conversion chip AD7171 and an auxiliary circuit of the american AD company. Meanwhile, the data preprocessing module 12 is an STM32L4+ chip of the american express semiconductor corporation or an SAM9G45 chip of the elmel corporation. In view of practical application, the data preprocessing module 12 is mainly implemented by a filtering algorithm of a digital baseband, and can process data by adopting common smoothing filtering and low-pass filtering, so as to reduce the influence of interference and noise. Meanwhile, the data preprocessing module 12 can run on a low power microprocessor platform. The utility model discloses a communication interface 13 read or wired interconnection interface for the memory. Specifically, it includes one or more of serial port, parallel port, and USB interface. And, the clock module 9 is a neon-M8 module of ublox company, which is built with a GPS/Beidou module as a core. In order to realize stable power supply, the second power supply module 14 mainly includes an HDR 60-5 module of Shanghai Ming latitude electric Co., Ltd.

In view of practical implementation, the wireless communication module 168 installed in the route selection decision device 3 of the present invention is a module from hua shi of the company hua shi of ME909 s-821. During use, the wireless communication module 168 communicates with the acquisition device 1, and the first wired interface 17 is used for communicating with the zero sequence voltage monitoring device 2, which needs to match the line interconnection interface of the zero sequence voltage monitoring device 2. The adopted second storage module 15 is a hard disk reading module and can be matched with a flash interface to store data. Meanwhile, the line selection logic module 18 is an SPEAr320 processor of an ideographic semiconductor, and is provided with an LCD control interface and a memory read-write module, so that various daily logic processing requirements are met. Moreover, the display module 19 is a common PCD display screen or a display interface. In this way, an effective connection to an external display is possible. And, rely on independent second wired interface 20, can be used for external host computer or system main website, improve data communication efficiency. Furthermore, in order to satisfy the long-term stable operation, the third power module 21 of the present invention is formed by adding an auxiliary circuit to the power management chip TPS65043 of the TI company.

Still further, considering the unity of each device, the collecting device 1 body, the voltage monitoring device body and the judging device body can be matched with corresponding storage boxes.

The working principle of the utility model is as follows: through the acquisition device 1 which is arranged on the head end of the overhead line and acquires phase current, the phase current data is continuously induced by the current transformer and is stored in the device. Depending on a communication module 8 in the device, the device can respond to a wave recording uploading command of the line selection judgment device 3 and upload the wave recording at a certain specified time to the line selection judgment device 3. The zero sequence voltage is monitored through the zero sequence voltage monitoring device 2, zero sequence voltage data obtained by the secondary opening triangular voltage on the PT side are monitored in real time, and the data are transmitted to the fault judgment device. The maximum characteristics of the acquisition devices 1 and the zero sequence voltage monitoring devices 2 are that the acquisition devices 1 and the zero sequence voltage monitoring devices 2 are synchronous, the sampling synchronization error between the devices is not more than 10 microseconds, and the sampling data has time labels. During the actual implementation period, the line selection judging device 3 may receive the waveforms sent by the acquisition device 1 and the zero sequence voltage monitoring device 2, judge whether the ground fault occurs through the judgment of the waveforms, and finally obtain the result of the line selection of the ground fault. The acquisition device 1 and the zero sequence voltage monitoring device 2 mainly acquire phase current data and zero sequence voltage data respectively and record waves, but in order to realize the cooperative work of different devices inside and outside the station, the time synchronization between the two devices is required, and the relative synchronization between the two devices can be ensured by providing a reference signal through a GPS (global positioning system) and keeping the synchronization with an absolute time. For this purpose, both devices must also have communication means for communication with the line selection decision means 3.

It should be noted that the utility model discloses intend to protect equipment this life, data acquisition, comparison etc. that involve in the actual operation of equipment all are the expression of doing in order to illustrate the theory of operation of structure itself, and are not in the utility model discloses the within range that claims.

Through foretell expression of characters and combination of the attached drawing can be seen, adopt the utility model discloses afterwards, possess following advantage:

Furthermore, the indication directions or positional relationships described in the present invention are directions or positional relationships based on the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the indicated device or structure must have a specific direction or operate in a specific directional configuration, and therefore, should not be construed as limiting the present invention.

The terms "primary" and "secondary" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "primary" or "secondary" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Also, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "disposed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or mutually interacted. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. And it may be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or component so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. Distributed fault line selection equipment is including installing collection system (1) of gathering phase current on overhead line head, its characterized in that: the overhead line is also provided with a zero sequence voltage monitoring device (2) for monitoring zero sequence voltage, the zero sequence voltage monitoring device (2) is connected with a line selection judgment device (3) for receiving waveforms sent by the current acquisition device (1) and the zero sequence voltage monitoring device (2), the line selection judgment device (3) is in communication connection with the acquisition device (1),

the acquisition device (1) comprises an acquisition device (1) body, a current induction module (4) is installed on the acquisition device (1) body, an analog-to-digital conversion module (5) is arranged at the output end of the current induction module (4), a first storage module (6) is arranged at the output end of the analog-to-digital conversion module (5), a current measurement module (7) is arranged at the output end of the first storage module (6), a communication module (8) is arranged at the output end of the current measurement module (7), a clock module (9) is further connected to the acquisition device (1) body, energy supply ports of the modules are electrically connected with a first power module (10), an energy taking module (11) is connected to the first power module (10),

the zero sequence voltage monitoring device (2) comprises a voltage monitoring device body, wherein an analog-digital conversion module (5) is arranged on the voltage monitoring device body, a data preprocessing module (12) is arranged at the output end of the analog-digital conversion module (5), a communication interface (13) is arranged at the output end of the data preprocessing module (12), a clock module (9) is also connected to the voltage monitoring device body, and energy supply ports of the modules are electrically connected with a second power supply module (14),

the line selection judgment device (3) comprises a judgment device body, a second storage module (15) is arranged in the judgment device body, the input end of the second storage module (15) is connected with a wireless communication module (16) and a first wired interface (17) respectively, the output end of the second storage module (15) is connected with a line selection logic module (18), the output end of the line selection logic module (18) is connected with a display module (19) and a second wired interface (20), the judgment device body is further connected with a clock module (9), and the energy supply ports of the modules are all electrically connected with a third power module (21).

2. The distributed fault routing device of claim 1, wherein: the current sensing module (4) in the acquisition device (1) is a CT iron core sensing measurement assembly, the analog-to-digital conversion module (5) is composed of a 16-bit low-power consumption analog-to-digital conversion chip AD7171 and an auxiliary circuit of American AD company, the first storage module (6) is an external flash, the current measurement module (7) is an STM32L4+ chip of American ideological semiconductor company or an SAM9G45 chip of El Meier company, the communication module (8) is a module of Hua Mei company of ME909s-821, the clock module (9) is a neon-M8 module of ublox company, the first power supply module (10) is composed of a power supply management chip 65TPS 043 of TI company and an auxiliary circuit, and the energy taking module (11) is a CT iron core sensing electricity taking assembly.

3. The distributed fault routing device of claim 1, wherein: the line selection judgment device (3) in the zero sequence voltage monitoring device (2) is characterized in that an analog-to-digital conversion module (5) in the line selection judgment device (3) is composed of a 16-bit low-power-consumption analog-to-digital conversion chip AD7171 and an auxiliary circuit of American AD company, the data preprocessing module (12) is an STM32L4+ chip of American ideological semiconductor company or an SAM9G45 chip of Emamel company, the communication interface (13) is a memory reading or wired interconnection interface and comprises one or more of a serial port, a parallel port and a USB interface, the clock module (9) is a neon-M8 module of ublox company, and the second power supply module (14) is mainly constructed by adopting an HDR 60-5 module of Shanghai Ming latitude electric company Limited.

4. The distributed fault routing device of claim 1, wherein: the wireless communication module (16) in the line selection judgment device (3) is a module of Huashi ME909s-821 of Huashi corporation, the second storage module (15) is a hard disk reading module, the line selection logic module (18) is an SPEAr320 processor of an ideological semiconductor, the display module (19) is a common PCD display screen or a display interface, and the third power module (21) is formed by adding an auxiliary circuit to a power management chip TPS65043 of TI corporation.