CN104578011A - Cable line fault isolation method, device and system - Google Patents

Abstract

The invention discloses a cable line fault isolation method, device and system. The method includes: acquiring the zero-sequence current on the load side; judging whether the zero-sequence current exceeds a preset zero-sequence current value interval; if yes, controlling the intelligent boundary switch on the load side to be turned off. By adopting the technical solution provided by the invention, when a specific load side fails, only the intelligent boundary switch on the faulty load side needs to be disconnected, and the line switch does not need to be disconnected, which can effectively reduce the blackout area.

Description

Cable line fault isolation method, device and system

technical field

The invention relates to the field of electric power technology, in particular to a cable line fault isolation method, device and system.

Background technique

Electricity is an energy source powered by electrical energy. Electricity was invented in the 1870s. The invention and application of electricity set off the second industrialization upsurge and became one of the three scientific and technological revolutions in the world since the 18th century. Since then, technology has changed people's lives more rapidly. The large-scale power system that appeared in the 20th century is one of the most important achievements in the history of human engineering science. It is a power production and consumption system composed of power generation, power transmission, power transformation, power distribution and power consumption. It is converted into electricity through mechanical energy devices, and then supplied to various users through power transmission, transformation and distribution. Today is the age of the Internet, but we still have a growing demand for electricity because we have invented computers, home appliances, and more products that use electricity. It is undeniable that the continuous emergence of new technologies has made electricity a necessity for people.

With the long transmission distance of distribution lines, many branch lines, and harsh environmental and climatic conditions, natural disasters such as external breakage, equipment failure, and lightning often lead to a high failure rate. At present, the 10kV power distribution system generally adopts the small current grounding method in which the neutral point of the power grid is not grounded or grounded through the arc suppression coil. In this way, the small current grounding line selection device is light and convenient, easy to install and debug, and the fault detection is accurate. Sex has also improved.

However, in the current technology, when a single-phase ground fault occurs on the load side of the power system, the specific fault point cannot be located, only the distribution line can be located. Therefore, once a single-phase ground fault occurs on the load side, only by jumping out The faulty line is cut off by means of a line switch, so that all the lines are powered off, and the affected area is relatively large.

Contents of the invention

In view of this, the present invention provides a fault isolation method, device and system for a cable line. When a fault occurs on a specific load side, only the intelligent boundary switch on the faulty load side needs to be disconnected, and the line switch does not need to be disconnected. Open, can effectively reduce the blackout area.

To achieve the above object, the present invention provides the following technical solutions:

A cable line fault isolation method, comprising:

Obtain the zero-sequence current on the load side;

judging whether the zero-sequence current exceeds a preset zero-sequence current value range;

If it is, the intelligent demarcation switch on the control load side is disconnected.

Preferably, before obtaining the zero-sequence current of the load side, it also includes:

The zero-sequence current transformer is controlled to detect the zero-sequence current at the load side.

Preferably, it also includes:

The control communication module sends fault information to the preset mobile terminal and the distribution network server, and the fault information includes position information and status information of the intelligent boundary switch.

Preferably, the communication module is a wireless communication module.

Preferably, it also includes:

A control instruction for the intelligent boundary switch is obtained through the communication module, and the control instruction includes controlling the closing of the intelligent boundary switch.

A cable line fault isolation device, comprising:

a first acquisition unit, configured to acquire the zero-sequence current on the load side;

A judging unit, configured to judge whether the zero-sequence current exceeds a preset zero-sequence current value interval;

The first control unit is configured to control the intelligent boundary switch on the load side to turn off when the zero-sequence current exceeds a preset zero-sequence current value interval.

Preferably, it also includes:

The second control unit is used to control the zero-sequence current transformer to detect the zero-sequence current on the load side.

Preferably, it also includes:

The third control unit is used to control the communication module to send fault information to the preset mobile terminal and the distribution network server, and the fault information includes the position information and status information of the intelligent boundary switch;

The second obtaining unit is configured to obtain a control instruction for the intelligent boundary switch through the communication module, where the control instruction includes controlling the closing of the intelligent boundary switch.

A cable line fault isolation system comprising:

An intelligent boundary switch controller; connected with the intelligent boundary switch controller, a zero-sequence current transformer arranged inside the intelligent boundary switch controller; and an intelligent boundary switch connected with the intelligent boundary switch controller;

The control operation of the intelligent boundary switch controller includes obtaining the zero-sequence current on the load side, judging whether the zero-sequence current exceeds the preset zero-sequence current value range, and if so, controlling the intelligent boundary switch on the load side to turn off ;

The zero-sequence current transformer is used to detect the zero-sequence current on the load side.

Preferably, it also includes:

The communication module connected with the intelligent demarcation switch controller is used to send fault information to the preset mobile terminal and the distribution network server, the fault information includes the position information and status information of the intelligent demarcation switch, and obtains the corresponding The control instruction of the intelligent boundary switch, the control instruction includes controlling the closing of the intelligent boundary switch.

It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a cable line fault isolation method, device and system. Using the technical solution provided by the present invention, first obtain the zero-sequence current on the load side; judge whether the zero-sequence current exceeds the preset zero-sequence current value range; The intelligent demarcation switch is disconnected, and the intelligent demarcation switch is located on the load side, and disconnecting the intelligent demarcation switch on a certain load side will only cut off the power supply of the user's power consumption area on the load side. Therefore, the technical solution provided by the present invention can accurately locate the fault point when a single-phase ground fault occurs on the load side, that is, a fault occurs on a specific load side. The intelligent demarcation switch is enough, and there is no need to disconnect the line switch, so the other fault-free load side of the line can be powered normally, that is, the blackout area can be effectively reduced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a flow chart of a cable line fault isolation method provided by an embodiment of the present invention;

Fig. 2 is the flow chart of another kind of cable line fault isolation method provided by the embodiment of the present invention;

3 is a structural diagram of a cable line fault isolation device provided by an embodiment of the present invention;

Fig. 4 is a structural diagram of a cable line fault isolation system provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one

Please refer to FIG. 1 . FIG. 1 is a flow chart of a cable line fault isolation method provided by an embodiment of the present invention. As shown in Figure 1, the method includes:

Step S101, obtaining the zero-sequence current at the load side;

Specifically, the zero-sequence current on the load side is obtained through a zero-sequence current transformer.

Further, before obtaining the zero-sequence current, it also includes:

Control the zero-sequence current transformer to detect the zero-sequence current on the load side.

Step S102, judging whether the zero-sequence current exceeds a preset zero-sequence current value interval;

Specifically, the preset zero-sequence current value interval is optional, and is (i1～i2), wherein, i1 is the minimum value of the preset zero-sequence current value interval, and i2 is the preset zero-sequence current value interval maximum value. Execute the step S102 to obtain a yes or no judgment result, if the judgment result is yes, execute step S103; if the judgment result is no, the intelligent boundary switch remains closed and returns to the step S101.

Step S103, control the intelligent boundary switch on the load side to be turned off;

Specifically, when the zero-sequence current exceeds the preset zero-sequence current value interval, it indicates that a single-phase ground fault has occurred on the load side. At this time, the intelligent boundary switch controlling the load side is turned off, and the power supply is cut off to prevent safety accidents. happened.

Using the technical solution provided by Embodiment 1 of the present invention, first obtain the zero-sequence current on the load side; judge whether the zero-sequence current exceeds the preset zero-sequence current value interval; if so, it means that a single-phase ground fault occurs on the load side, and The intelligent boundary switch on the load side is controlled to be turned off, and the intelligent boundary switch is located on the load side. Turning off the intelligent boundary switch on a certain load side will only cut off power in the user's power consumption area on the load side. Therefore, the technical solution provided by the present invention can accurately locate the fault point when a single-phase ground fault occurs on the load side, that is, a fault occurs on a specific load side. The intelligent demarcation switch is enough, and there is no need to disconnect the line switch, so the other fault-free load side of the line can be powered normally, that is, the blackout area can be effectively reduced.

In addition, in the existing technology, the intelligent boundary switch on the control load side is disconnected, and after the fault isolation is implemented, the maintenance personnel usually know that a fault has occurred after passively receiving feedback from the user on the fault load side, and then they can go for maintenance. very low. In order to solve this problem, the present invention also discloses a second specific embodiment.

Embodiment two

Please refer to FIG. 2 . FIG. 2 is a flow chart of another cable line fault isolation method provided by an embodiment of the present invention. As shown in Figure 2, the method includes:

Step S201, obtaining the zero-sequence current at the load side;

Step S202, judging whether the zero-sequence current exceeds a preset zero-sequence current value interval;

Specifically, if yes, execute the steps S203, S204 and S205 in sequence; if no, return to the step S201;

Step S203, controlling the intelligent boundary switch on the load side to be turned off;

Step S204, controlling the communication module to send fault information to the preset mobile terminal and the distribution network server;

Specifically, the fault information includes position information and state information of the intelligent boundary switch; the position information of the intelligent boundary switch can represent the specific position of the load side where a single-phase ground fault occurs, and the state information includes the intelligent Open state or closed state information of the demarcation switch.

Specifically, the communication module is a wireless communication module, and the communication module sends fault information to a preset mobile terminal and a distribution network server through a wireless network.

Further, the wireless communication module is applicable to current mainstream wireless communication networks, such as GPRS (General Packet Radio Service, general packet radio service technology) network, CDMA (Code Division Multiple Access, code division multiple access) network, WCDMA ( Wideband Code Division Multiple Access (WCDMA) network, TD-LTE (Time Division Long Term Evolution, Time Division Long Term Evolution) network, etc.

Step S205, obtaining a control instruction for the intelligent boundary switch through the communication module;

Specifically, the control instruction includes controlling the closing of the intelligent boundary switch.

Step S206, in response to the control instruction, control the smart boundary switch to close.

It can be seen that, in the technical solution provided by the present invention, in addition to manually closing the equipment on site, the closing command can also be obtained remotely through the communication module, and the closing command is aimed at the intelligent boundary switch. The communication module is a wireless communication module. That is, the maintenance personnel send control instructions to the wireless communication module through the mobile terminal equipment (eg, mobile phone) via the wireless communication network.

Specifically, after the intelligent boundary switch is controlled to be closed in response to the closing instruction, the power supply to the user at the fault load side can be restored.

According to the technical solution provided by Embodiment 2 of the present invention, the maintenance personnel can receive the fault information sent by the communication module at the first time when the fault isolation is performed on the fault load side, so that the fault information can be obtained in time, and the maintenance personnel can be improved to a large extent. Rapid response to failures.

Through the technical solution provided by Embodiment 2 of the present invention, remote control of the intelligent boundary switch can be realized. After troubleshooting, the maintenance personnel can control the closing of the intelligent boundary switch without going to the site of the disconnected intelligent boundary switch, which can improve work efficiency.

In order to describe the technical solution provided by the invention more comprehensively, the invention also discloses a fault isolation device for cable lines.

Please refer to FIG. 3 . FIG. 3 is a structural diagram of a cable line fault isolation device provided by an embodiment of the present invention. As shown in Figure 3, the device includes:

The first obtaining unit 301 is used to obtain the zero-sequence current of the load side;

A judging unit 302, configured to judge whether the zero-sequence current exceeds a preset zero-sequence current value interval;

The first control unit 303 is configured to control the intelligent boundary switch on the load side to turn off when the zero-sequence current exceeds a preset zero-sequence current value range.

Further, the cable line fault isolation device provided in the embodiment of the present invention also includes:

The second control unit is used to control the zero-sequence current transformer to detect the zero-sequence current on the load side.

The third control unit is used to control the communication module to send fault information to the preset mobile terminal and the distribution network server, and the fault information includes the position information and status information of the intelligent boundary switch;

The second obtaining unit is configured to obtain a control instruction for the intelligent boundary switch through the communication module, where the control instruction includes controlling the closing of the intelligent boundary switch.

The fourth control unit is configured to control the intelligent boundary switch to close in response to the control instruction.

Furthermore, the present invention also discloses a cable line fault isolation system.

Please refer to FIG. 4 . FIG. 4 is a structural diagram of a cable line fault isolation system provided by an embodiment of the present invention. As shown in Figure 4, the system includes:

Intelligent boundary switch controller 401; connected with the intelligent boundary switch controller 401, the zero-sequence current transformer 4011 arranged inside the intelligent boundary switch controller 401; and connected with the intelligent boundary switch controller 401 The intelligent boundary switch 402;

The control operation of the intelligent boundary switch controller 401 includes obtaining the zero-sequence current on the load side, judging whether the zero-sequence current exceeds the preset zero-sequence current value range, and if so, controlling the intelligent boundary switch 402 on the load side disconnect;

The zero-sequence current transformer 4011 is used to detect the zero-sequence current at the load side.

Specifically, the intelligent boundary switch controller 401 obtains the zero-sequence current at the load side through the zero-sequence current transformer 4011 .

Further, the cable line fault isolation system provided in the embodiment of the present invention also includes:

A communication module connected to the intelligent boundary switch controller 401, configured to send fault information to preset mobile terminals and distribution network servers, the fault information including position information and status information of the intelligent boundary switch 402, and Obtain the control instruction to the intelligent boundary switch 402, the control instruction includes controlling the closing of the intelligent boundary switch 402; then the control operation of the intelligent boundary switch controller 401 also includes: obtaining the The control instruction of the intelligent boundary switch 402 controls the closing of the intelligent boundary switch 402 in response to the control instruction.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the devices and systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and for relevant details, please refer to the description of the method part.

The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be directly implemented by hardware, software modules executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a cable line fault partition method, is characterized in that, comprising:

Obtain the zero-sequence current of load side;

Judge whether described zero-sequence current exceeds default zero-sequence current value interval;

If so, the intelligent demarcation switch of control overhead side disconnects.

2. method according to claim 1, is characterized in that, before the zero-sequence current of described acquisition load side, also comprises:

Control the described zero-sequence current of zero sequence current mutual inductor detection load side.

3. method according to claim 1, is characterized in that, also comprises:

Control communication module and send fault message to default mobile terminal and power distribution network server, described fault message comprises positional information and the state information of described intelligent demarcation switch.

4. method according to claim 3, is characterized in that, described communication module is wireless communication module.

5. method according to claim 3, is characterized in that, also comprises:

Obtain the control command to described intelligent demarcation switch by described communication module, described control command comprises the described intelligent demarcation switch of control and closes.

6. a cable line fault spacer assembly, is characterized in that, comprising:

First acquiring unit, for obtaining the zero-sequence current of load side;

Judging unit, interval for judging whether described zero-sequence current exceeds default zero-sequence current value;

First control unit, during for exceeding default zero-sequence current value interval when described zero-sequence current, the intelligent demarcation switch of control overhead side disconnects.

7. device according to claim 6, is characterized in that, also comprises:

Second control unit, for controlling the zero-sequence current of zero sequence current mutual inductor detection load side.

8. device according to claim 6, is characterized in that, also comprises:

3rd control unit, send fault message for controlling communication module to default mobile terminal and power distribution network server, described fault message comprises positional information and the state information of described intelligent demarcation switch;

Second acquisition unit, for being obtained the control command to described intelligent demarcation switch by described communication module, described control command comprises the described intelligent demarcation switch of control and closes.

9. a cable line fault shielding system, is characterized in that, comprising:

Intelligent demarcation switch controller; Be connected with described intelligent demarcation switch controller, be arranged at the zero sequence current mutual inductor of described intelligent demarcation switch controller inside; And the intelligent demarcation switch to be connected with described intelligent demarcation switch controller;

The control operation of described intelligent demarcation switch controller comprises, and obtains the zero-sequence current of load side, judges whether described zero-sequence current exceeds default zero-sequence current value interval, and if so, the described intelligent demarcation switch of control overhead side disconnects;

Described zero sequence current mutual inductor is used for, the zero-sequence current of detection load side.

10. system according to claim 9, is characterized in that, also comprises:

The communication module be connected with described intelligent demarcation switch controller, for sending fault message to default mobile terminal and power distribution network server, described fault message comprises positional information and the state information of described intelligent demarcation switch, and the control command obtained described intelligent demarcation switch, described control command comprises the described intelligent demarcation switch of control and closes.