CN104330686A - System for detecting power supply circuit fault - Google Patents

Abstract

The invention discloses a power supply line fault detection system, which comprises a fault detection module, a positioning module, a communication module and an information receiving master station. The fault detection module includes a short-circuit fault detection unit fixed on the single-phase cable of the three-phase cable; a ground fault detection unit fixed on the bus of the three-phase cable; or/and a temperature detection unit installed on the cable joint. The positioning module outputs the position information of the power supply line. The fault detection module, the positioning module and the information receiving master station are connected by a communication module through a general packet radio service technology GPRS remote wireless transmission mode. The information receiving master station includes a processor, a display and a human-computer interaction unit. The invention provides that the fault detection module can transmit the information to the information receiving master station when there is a ground fault or phase-to-phase short circuit fault information, and the positioning module transmits the position information to the information receiving master station, so as to quickly and effectively find the fault location and fix the fault location For timely processing.

Description

A system for fault detection of power supply lines

technical field

The invention relates to the field of power supply line detection, in particular to a power supply line fault detection system.

Background technique

At present, the failures of 10kV urban and rural distribution network cable systems in my country are relatively frequent, especially in many areas where the power grid lines span many regions, have a wide range, and the environment along the way is diverse. Inconvenient, also can cause the economic loss of other units simultaneously. The relatively high frequency of faults mainly includes ground faults and short-circuit faults between phases of cables on transmission lines. Because the power grid lines span many areas and have a large range, manual inspection or segmental tests are usually used to determine the line segment where the fault occurs, which is extremely unfavorable to the safety of the line and equipment operation.

Contents of the invention

The purpose of the present invention is to provide a power supply line fault detection system, which can quickly and effectively detect transmission line faults and determine the location of the fault, without the need for testing or positioning by means of manual inspection or segmental testing.

In order to solve the problems of the technologies described above, the present invention provides the following technical solutions:

A system for fault detection of a power supply line, comprising:

Fault detection module, positioning module, communication module and information receiving master station; among them,

The fault detection module includes a short-circuit fault detection unit fixed on a single-phase cable of a three-phase cable;

a ground fault detection unit fixed on the bus of said three-phase cable; or/and

a temperature detection unit installed on the cable joint;

The positioning module is connected to the fault detection module, and is used to output the position information of the power supply line;

The communication fault detection module, the positioning module and the information receiving master station are connected by the communication module through the general packet radio service technology GPRS remote wireless transmission mode;

The information receiving master station includes a processor;

a display for displaying information received by the processor; and

The human-computer interaction unit connected with the processor is used to respond to the operator's operation and send out instructions for troubleshooting.

Preferably, it also includes: an alarm indication device connected to the processor.

Preferably, there are multiple fault detection modules.

Preferably, the communication module includes a power supply and a GPRS data communication unit.

Preferably, the power supply includes: a supercapacitor.

Preferably, the communication speed of the GPRS communication unit is 2400bps, 4800bps or 9600bps.

Preferably, the power supply is a current sensing power supply.

Preferably, the temperature detection unit includes: a temperature sensor; and

The AD conversion unit connected with the temperature sensor is used to convert the analog signal output by the temperature sensor into a digital signal conforming to the transmission standard of the communication module.

Compared with the prior art, the above-mentioned technical solution has the following advantages:

The power supply line fault detection system provided by the embodiment of the present invention includes a fault detection module, a positioning module, a communication module and an information receiving master station. Wherein, the fault detection module includes a short-circuit fault detection unit fixed on the single-phase cable of the three-phase cable, a ground fault detection unit fixed on the bus of the three-phase cable, or/and a temperature detection unit installed on the cable joint. The positioning module is connected to the fault detection module and is used to output the position information of the power supply line. The fault detection module, the positioning module and the information receiving main station are connected by the communication module through the GPRS remote wireless transmission mode of the general packet radio service technology. The information receiving master station includes a processor, a display for displaying the information received by the processor, and a human-computer interaction unit connected with the processor, which is used for responding to an operator's operation and issuing instructions for troubleshooting.

Therefore, the power supply line fault detection system provided by the present invention can transmit the information to the information receiving master station by wireless communication through the fault detection module when a ground fault or a phase-to-phase short circuit fault occurs, and the positioning module transmits the position information to the information receiving master station, and then The human-computer interaction unit sends out the instruction of repairing the fault, quickly and effectively finds the fault location and handles the fault location in time.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram provided by a specific embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a fault detection module in a specific embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an information receiving master station in a specific embodiment of the present invention.

Detailed ways

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

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described here, and those skilled in the art can make similar extensions without departing from the connotation of the present invention. Accordingly, the invention is not limited to the specific implementations disclosed below.

The present invention discloses a power supply line fault detection system, see Fig. 1, including:

Fault detection module 10 , positioning module 20 , communication module 30 and information receiving master station 40 .

The fault detection module 10 automatically adapts to the load current and the setting value of the substation outlet protection, so as to avoid malfunction under the condition of large load fluctuation and closing inrush current.

Specifically, the fault detection module 10, referring to FIG. 2 , includes a short-circuit fault detection unit 101 fixed on a single-phase cable of a three-phase cable, a ground fault detection unit 102 fixed on a bus of a three-phase cable, or/and installed on The temperature detection unit 103 of the cable joint.

Specifically, the short-circuit fault detection principle of the short-circuit fault detection unit 101 is:

First, the short-circuit current mutation increment is greater than a certain value. Then the switch trips, the current drops below a certain level, and the voltage drops below a certain preset value at the same time, it is considered that the circuit has a short circuit fault.

The detection principle of the ground fault detection unit 102 is: in a three-phase four-wire circuit, the phasor sum of the three-phase currents is equal to zero. When an electric shock or leakage fault occurs in the circuit, leakage current flows in the circuit, and the phasor sum of the three-phase current is not equal to zero. Compared with the predetermined current value, if it is greater than the predetermined current, it is considered that a ground fault occurs.

The temperature detection unit 103 realizes early warning of faults by continuously monitoring the joint temperature of the cable line.

The location module 20 is connected with the fault detection module 10 and is used to output the location information of the power supply line. The fault detection module 10, the positioning module 20 and the information receiving master station 40 are connected by the communication module 30 through the general packet radio service technology GPRS remote wireless transmission mode.

The information receiving master station 40, referring to Fig. 3, includes a processor 401, a display 402 for displaying information received by the processor 401, and a human-computer interaction unit 403 connected to the processor 401, for responding to the operator's operation, sending Instructions for troubleshooting.

The power supply line fault detection system provided by the present invention can transmit the fault information and the fault location to the information receiving master station by wireless communication when a ground fault or an interphase short circuit fault occurs through the fault detection module and the positioning module, and then the man-machine The interactive unit issues instructions for repairing faults, quickly and effectively finds the fault location and can handle the fault location in time.

In another power supply line fault detection system disclosed in the present invention, the system includes:

The power supply line fault detection system provided by the embodiment of the present invention includes a fault detection module, a positioning module, a communication module and an information receiving master station.

Wherein, the fault detection module includes a short-circuit fault detection unit fixed on the single-phase cable of the three-phase cable, a ground fault detection unit fixed on the bus of the three-phase cable, or/and a temperature detection unit installed on the cable joint.

The temperature detection unit includes: a temperature sensor and an AD conversion unit connected to the temperature sensor. Here, the AD conversion unit is used to convert the analog signal output by the temperature sensor into a digital signal conforming to the transmission standard of the communication module.

Of course, in other embodiments, the fault detection module can be selected in a targeted manner, and the short circuit fault detection unit, the ground fault detection unit and the temperature detection power supply do not necessarily need to be provided at the same time. For example, the temperature detection unit can detect the temperature rise of the line and give an early warning of line failure. But if the line does not often have this problem, it is not necessary to install a temperature detection unit. Or areas that do not require early warning may not be installed. Of course, it is also possible to reasonably configure more detection devices in key areas to detect line faults in time and restore the normal state of the line in time.

The positioning module is connected to the fault detection module and is used to output the position information of the power supply line. The fault detection module, the positioning module and the information receiving main station are connected by the communication module through the GPRS remote wireless transmission mode of the general packet radio service technology.

Specifically, the communication module includes a power supply and a GPRS data communication unit.

In a specific embodiment, the power supply includes a supercapacitor, and when the power supply module loses power, the supercapacitor can maintain the continuous operation of the communication module. Of course, in actual situations, the capacity of the supercapacitor can be selected to ensure that the communication module can send fault information to the information receiving master station when the power is lost.

In other embodiments, the power supply is a current sense power supply. The current induction power supply adopts a double-coil parallel structure, which is composed of a power-taking coil, a control circuit, and a power supply module. Wherein the electric coil is responsible for capturing the electric energy of the primary circuit. The control circuit transforms the secondary current of the power-taking coil into a stable voltage output for power supply.

The communication speed of the GPRS communication unit can be selected as 2400bps, 4800bps or 9600bps. Specifically, the communication speed can be selected according to actual needs and characteristics of specific transmission equipment, so as to ensure timely and efficient information transmission.

The information receiving master station includes processing, a display for displaying the information received by the processor, and a human-computer interaction unit connected to the processor, which is used to respond to the operator's operation and issue instructions for troubleshooting, indicating devices, and The processor is connected for alarming.

Specifically, the master station receives the fault information and the area information generated by the fault, and displays it on the display. According to the fault information and area information, the staff can give maintenance instructions to the personnel at the work site in the area through the human-computer interaction unit, so as to quickly repair the faulty circuit and ensure that the faulty area quickly returns to normal power supply.

In a specific embodiment, there can be multiple fault detection modules, which are respectively placed in areas with high incidence of faults. Of course, correspondingly, multiple positioning modules can also be provided. Here, the number and region are specifically set, which can be set according to the actual situation.

The system for detecting a fault in a power supply line provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principles and implementation methods of the present invention, and the descriptions of the above embodiments are only used to help understand the present invention and its core ideas. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (8)

1. A system for power supply line fault detection, comprising:

the system comprises a fault detection module, a positioning module communication module and an information receiving master station; wherein,

the fault detection module comprises a short-circuit fault detection unit fixed on a single-phase cable of the three-phase cable;

a ground fault detection unit fixed on a bus of the three-phase cable; or/and

a temperature detection unit installed at the cable joint;

the positioning module is connected with the fault detection module and used for outputting the position information of the power supply circuit;

the fault detection module, the positioning module and the information receiving master station are connected by a communication module in a GPRS remote wireless transmission mode;

the information receiving main station comprises a processor;

a display for displaying information received by the processor; and

and the human-computer interaction unit is connected with the processor and used for responding to the operation of an operator and sending out a fault maintenance instruction.

2. The system of claim 1, further comprising: and the alarm indicating device is connected with the processor.

3. The system of claim 1, wherein the fault detection module is plural.

4. The system of claim 1, wherein the communication module comprises a power supply and a GPRS data communication unit.

5. The system of claim 4, wherein the power supply comprises: and (4) a super capacitor.

6. The system of claim 4, wherein the communication speed of the GPRS communication unit is 2400bps, 4800bps, or 9600 bps.

7. The system of claim 4, wherein the power supply is a current-sensing power supply.

8. The system of claim 1, wherein the temperature detection unit comprises: a temperature sensor; and

and the AD conversion unit is connected with the temperature sensor and is used for converting the analog signal output by the temperature sensor into a digital signal conforming to the transmission standard of the communication module.