CN113484670A

CN113484670A - Cable fault detector and use method

Info

Publication number: CN113484670A
Application number: CN202110714487.XA
Authority: CN
Inventors: 侯钦民; 胡海波; 刘康; 张红梅; 邵慧燕; 孔祥龙; 王振; 王冉
Original assignee: Qufu Power Supply Co Of State Grid Shandong Electric Power Co; State Grid Corp of China SGCC; Jining Power Supply Co
Current assignee: Qufu Power Supply Co Of State Grid Shandong Electric Power Co; State Grid Corp of China SGCC; Jining Power Supply Co
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2021-10-08

Abstract

The invention relates to the technical field of fault detection, in particular to a cable fault detector and a method of use, comprising a box cover and a box body, a box cover is rotatably installed on one side of the box body, and probe jacks are respectively provided on both sides of the box cover , USB transfer interface; the box is provided with a high-voltage output interface, a power interface, a power switch, and a heat dissipation hole; a transformer and a touch-operable display screen are arranged in the box, and the low-voltage end of the transformer is connected to the power interface through a wire The high-voltage end of the transformer is connected to the high-voltage output interface through a wire, and the power switch is connected in series with the transformer; the front of the box is inlaid with a touch-operable display screen, and the back of the touch-operable display screen is respectively connected to the detection processing module, The control module is connected, and the detection processing module and the control module are fixed in the inner slot of the box body; it is convenient to accurately locate the fault location.

Description

Cable fault detector and use method

Technical Field

The invention relates to the technical field of fault detection, in particular to a cable fault detector and a using method thereof.

Background

In recent years, single-phase earth fault line selection and positioning technology is continuously developed under the efforts of numerous scientific researchers, and various fault indicating devices suitable for different occasions are also used. During fault indication device was applied to the distribution network, can the abnormal operating condition of real-time detection distribution lines, short circuit or ground fault of short-circuit or location circuit help relevant personnel to isolate the trouble district section fast, maintains, reduces power off time and power off range. Therefore, the fault indicating device system is widely applied in China.

In order to ensure that the fault indicator can accurately operate when a line has a fault, the operation performance of the fault indicator needs to be detected before the fault indicator is put into operation. The fault indicating device to be detected is installed on the actual line of the distribution network for detection, the coordination of each power department is needed, the time and the labor are consumed, and the limitation of the safe and economic operation of the power system is realized. Therefore, establishing a set of system for simulating the voltage and current change conditions after the single-phase earth fault occurs and detecting the operation reliability and sensitivity of the fault indicating device is a problem to be solved urgently by the continuous development of the current single-phase earth fault line selection and positioning technology.

Disclosure of Invention

The invention aims to solve the defect that faults are inconvenient to detect in the prior art, and provides a fault detector for an outer sheath of a high-voltage cable and a using method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a cable fault detector comprises a box cover and a box body, wherein the box cover is rotatably arranged on one side outside the box body, and a probe jack and a USB (universal serial bus) adapter are respectively arranged on the side surface of the box cover; the box body is provided with a high-voltage output interface, a power switch and heat dissipation holes;

a transformer and a touch-operable display screen are arranged in the box body, the low-voltage end of the transformer is connected with a power interface through a wire, the high-voltage end of the transformer is connected with a high-voltage output interface through a wire, and the power switch is connected with the transformer in series;

the front of box is inlayed the display screen of tangible operation, and the display screen back of tangible operation links to each other with detection and processing module, control module respectively, and detection and processing module and control module fix in the interior slot of box.

According to a further scheme, a voltmeter and a first ammeter are arranged in the tank body in the Shanghai mode, the voltmeter is a kilovolt meter, the first ammeter is a milliammeter, the voltmeter is connected with the high-voltage end of the transformer in parallel through a wire, and the first ammeter is connected with the transformer in series.

According to a further scheme, a starting button, a power indicator light and an emergency stop button are further arranged on the box body, and the starting button, the power indicator light and the emergency stop button are connected with the transformer in series.

In a further scheme, a grounding interface is arranged on the box body and connected with a grounding wire.

According to a further scheme, a voltage adjusting knob is arranged on the box body, a potentiometer is arranged in the box body and connected with the potentiometer, and the potentiometer is connected to the high-voltage end of the transformer in series.

In a further scheme, the control module is connected with the touch-operable display screen and the USB adapter through the probe jack to exchange data with the outside.

In a further scheme, the control module is connected with the detection processing module circuit and controls the detection processing module.

In a further scheme, a probe groove is formed in the case cover.

In a further scheme, the box cover is provided with a collection cable groove for placing a collection cable, and the probe is connected with the control system through the collection cable.

The application also provides a using method of the cable fault detector, which comprises the following steps:

s1: the grounding interface is connected by using a ground wire, the high-voltage output interface and the cable to be tested are connected by using a high-voltage wire, and the power interface and the AC220V power supply are connected by using a power line;

s2: turning on a power switch, pressing a start button, rotating a voltage adjusting knob, observing a voltmeter and a first ammeter, and selecting proper voltage to output;

s3: inserting the probe into the probe jack, inserting the probe into the ground along the path of the cable and right above the cable in the range of the thick side, and observing a cable fault display;

s4: continuously advancing the position of the probe above the path of the cable, observing a cable fault display in the process, finding out a section with changed polarity, and then finding out a point with a pulse signal of 0, namely a fault point, in the section;

s5: and pressing the emergency stop button, disconnecting the power switch and disconnecting the connection line of the cable to be tested and the power supply.

The cable fault detector and the using method have the beneficial effects that: the fault point can be found in time, and precious time is provided for maintenance. The voltage monitoring function is provided; possesses the ground current monitoring function. Fault information, system voltage and the like can be monitored and actively monitored. And precisely positioning a fault point. The implementation is simple, the cost is low, and the reliability is high.

Drawings

Fig. 1 is a schematic structural diagram of a cable fault detector according to the present invention;

fig. 2 is a schematic structural diagram of the back surface of a box body of the cable fault detector provided by the invention;

in the figure: 1. the box cover, 2, the box, 3, the USB interface, 4, the probe jack, 5, high-voltage output interface, 6, power source, 7, switch, 8, louvre, 9, display screen, 10, ground connection interface, 11, voltmeter, 12, the ampere meter, 13, power indicator, 14, start button, 15, scram button, 16, detection processing module, 17, control module, 18, the probe, 19, gather the cable groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-2, the cable fault detector comprises a box cover 1 and a box body 2, wherein the box cover 1 is rotatably installed on one side outside the box body 2, and a USB adapter port 3 and a probe jack 4 are respectively arranged on the side surface of the box cover 1; the box body 2 is provided with a high-voltage output interface 5, a power interface 6, a power switch 7 and a heat dissipation hole 20; the power interface 6 is used for being connected with a power supply, the transformer is used for converting 220V voltage into high voltage for transmission, and the power switch 7 is used for controlling the on-off of a circuit.

A transformer and a touch-operable display screen 9 are arranged in the box body, the low-voltage end of the transformer is connected with the power interface through a wire, the high-voltage end of the transformer is connected with the high-voltage output interface 5 through a wire, and the power switch 7 is connected with the transformer in series;

the front surface of the box body 2 is inlaid with a touch-operable display screen 9, the back surface of the touch-operable display screen 9 is respectively connected with a detection processing module 16 and a control module 17, and the detection processing module 16 and the control module 17 are fixed in an inner slot of the box body 1.

The box body is provided with a voltmeter 11 and a first ammeter 12, the voltmeter 11 is a kilovolt meter, the first ammeter 12 is a milliammeter, the voltmeter 11 is connected with the high-voltage end of the transformer in parallel through a lead, and the first ammeter 12 is connected with the transformer in series. The box body 1 is provided with a starting button 15, a power indicator lamp 13 and an emergency stop button 14 which are connected with the transformer in series. The box body 2 is provided with a grounding interface 10, and the grounding interface 10 is connected with a grounding wire. The box body 2 is provided with a voltage adjusting knob 14, the box body 1 is internally provided with a potentiometer, the voltage adjusting knob 8 is connected with the potentiometer, and the potentiometer is connected with the high-voltage end of the transformer in series. Voltmeter 11 and first ampere meter 12 cooperate voltage adjusting knob 9 to adjust output power voltage, and ground connection interface 10 is used for connecting the ground wire, prevents the electric leakage, improves the security.

As shown in fig. 1-2, a touch-operable display screen 9, a power button 7, heat dissipation holes 20, an external power port 6, a detection processing module 16 and a control module 17 are arranged in the box body 2, the power button 7, the heat dissipation holes 20 and the external power port 6 are all distributed on two sides of the box body, the detection processing module 16 and the control module 17 are fixed in an inner slot of the box body 2, the touch-operable display screen 9 is embedded in the front of the box body, and the back of the touch-operable display screen 9 is respectively connected with the detection processing module 16 and the control module 17.

The detection system can be operated through a touch display screen 9 and can also be operated through an external mouse keyboard of the USB adapter 3. Meanwhile, the control module 16 is electrically connected with the detection processing module 17 to control the detection processing module 17.

The invention also provides a use method of the high-voltage cable outer sheath fault detector, which comprises the following steps:

s3: inserting the probe into the probe jack, inserting the probe 18 into the ground along the path of the cable and directly above the cable within the range of the thick side, and observing the display screen;

s4: continuously advancing the position of the probe right above the path of the cable, observing a display screen in the process, finding out a section with changed polarity, and then finding out a point with a pulse signal of '0', namely a fault point, in the section;

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A cable fault detector comprising a box cover and a box body, characterized in that: a box cover is rotatably installed on one side of the outer side of the box body, and both sides of the box cover are respectively provided with a probe jack and a USB transfer interface; The box body is provided with a high-voltage output interface, a power interface, a power switch, and a heat dissipation hole;

The box is provided with a transformer and a touch-operable display screen, the low-voltage end of the transformer is connected to the power interface through a wire, the high-voltage end of the transformer is connected to the high-voltage output interface through a wire, and the power switch is connected in series with the transformer ;

The front of the box is inlaid with a touch-operable display screen, and the back of the touch-operable display screen is respectively connected with the detection processing module and the control module, and the detection processing module and the control module are fixed in the inner slot of the box body.

2 . The cable fault detector according to claim 1 , wherein the box body is provided with a voltmeter and a first ammeter, the voltmeter is a kilovoltmeter, and the first ammeter is a milliampere. 3 . , the voltmeter is connected in parallel with the high voltage end of the transformer through a wire, and the first ammeter is connected in series with the transformer.

3. The cable fault detector as claimed in claim 1, wherein a start button, a power indicator light and an emergency stop button are also provided on the box body, and the start button, the power indicator light and the emergency stop button are the same as the Transformers are connected in series.

4 . The cable fault detector according to claim 1 , wherein the box body is provided with a grounding interface, and the grounding interface is connected with a grounding wire. 5 .

5. The cable fault detector according to claim 1, wherein a voltage adjustment knob is provided on the box body, a potentiometer is arranged in the box body, and the voltage adjustment knob is connected with the potentiometer, so that the The potentiometer is connected in series on the high voltage end of the transformer.

6 . The cable fault detector according to claim 1 , wherein the control module is connected with a touch-operable display screen and a USB transfer interface to exchange data with the outside world through a probe jack connection. 7 .

7 . The cable fault detector according to claim 1 , wherein the control module is connected with the detection processing module circuit, and controls the detection processing module. 8 .

8 . The cable fault detector according to claim 1 , wherein a probe groove is provided on the box cover. 9 .

9 . The cable fault detector according to claim 1 , wherein a collection cable slot is provided on the box cover for placing the collection cable, and the probe is connected to the control system through the collection cable. 10 .

10. A method of using a cable fault detector according to claims 1-9, characterized in that, comprising the following steps:

S1: Use the ground wire to connect the ground interface, use the high voltage wire to connect the high voltage output interface and the cable to be tested, and use the power wire to connect the power interface and AC220V power supply;

S2: Turn on the power switch and press the start button, rotate the voltage adjustment knob, observe the voltmeter and the first ammeter, and select the appropriate voltage output;

S3: Insert the probe into the probe jack, along the path of the cable, just above the cable within the thick side range, insert the probe into the ground, and observe the cable fault indicator;

S4: Just above the path of the cable, keep moving the position of the probe forward. During this process, pay attention to observe the cable fault indicator, first find the section where the polarity changes, and then find the pulse signal in this section is "0" point, that is, the point of failure;

S5: Press the emergency stop button and turn off the power switch, disconnect the cable to be tested and the power supply.