Cable fault detection system

Abstract

The utility model relates to a cable fault detection system which is used for detecting an underground cable between a sea pump room and a brickyard cable transfer station, and a signal generation unit is used for generating a pulse voltage when the cable breaks down, transmitting the pulse voltage to the cable, receiving an electric signal fed back by the cable, and sending the electric signal to the cable transfer station. Transmitting the electric signal to the first fault detection unit; the first fault detection unit is used for generating a test signal after receiving the electric signal and inputting the test signal into the cable so as to detect the fault distance range of the cable, the fault distance range of the cable can be directly detected through connection between modules, the detection accuracy can be improved, and the detection efficiency is improved. And meanwhile, the detection efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electronics, and in particular, to a cable fault detection system. BACKGROUND

[0002] Cable fault identification is mainly to identify the type, location and severity of the fault existing in the cable through systematic detection, analysis and judgment methods, so as to ensure the stable operation of the cable. In the related art, the cable fault is usually identified through insulation test and voltage withstand test methods. However, the cable fault identified through the related art has low precision and low positioning efficiency. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present disclosure is to provide a cable fault detection system to solve the technical problems existing in the related art.

[0004] In order to achieve the above purpose, the present disclosure provides a cable fault detection system for detecting the cable arranged underground between a sea pump house and a brick factory cable switching station. The cable fault detection system comprises a signal generating unit and a first fault detection unit. The output end of the signal generating unit is connected with the input end of the first fault detection unit. The output end of the signal generating unit and the output end of the first fault detection unit are both used for connecting the cable.

[0005] The signal generating unit is used for generating a pulse voltage when the cable fails, transmitting the pulse voltage into the cable, receiving the feedback electrical signal of the cable, and transmitting the electrical signal into the first fault detection unit.

[0006] The first fault detection unit is used for generating a test signal after receiving the electrical signal, and inputting the test signal into the cable to detect the distance range of the cable failure.

[0007] Optionally, the signal generating unit comprises a power supply module, a voltage boosting module and a control module. The output end of the power supply module is connected with the input end of the voltage boosting module. The output end of the voltage boosting module is connected with the input end of the control module. The output end of the control module is connected with the input end of the first fault detection unit. The output end of the control module is also used for connecting the cable.

[0008] The power supply module is used for generating a first voltage and transmitting the first voltage into the voltage boosting module.

[0009] The voltage boosting module is used for raising the first voltage to a second voltage and transmitting the second voltage into the control module.

[0010] The control module is configured to generate the pulse voltage according to the second voltage, transmit the pulse voltage into the cable, receive the electrical signal fed back by the cable, and transmit the electrical signal into the first fault detection unit.

[0011] Optionally, the voltage boosting module is a transformer and / or an electronic voltage boosting module.

[0012] Optionally, the signal generation unit further comprises a first protection module connected with the control module.

[0013] The first protection module is configured to monitor whether the threshold value of the pulse voltage is greater than a first threshold value and / or whether the second voltage is greater than a second threshold value, and cut off a first relay and / or a second relay, wherein the first relay is a relay for controlling the input of the control module, and the second relay is a relay for controlling the output of the control module.

[0014] Optionally, a signal output end of the signal generation unit is configured to be connected with a first phase line of the cable, and a grounding end of the signal generation unit is configured to be connected with a second phase line of the cable, wherein the first phase line is different from the second phase line.

[0015] Optionally, the system further comprises a second protection module connected with a grounding line of the cable.

[0016] The second protection module is configured to release the electric charge on the cable after the signal generation unit completes work.

[0017] Optionally, the second protection module is a discharge rod.

[0018] Optionally, the system further comprises a fault positioning unit connected with the first fault detection unit.

[0019] The first fault detection unit is further configured to send the distance range to the fault positioning unit.

[0020] The fault positioning unit is configured to receive the distance range to locate the fault position of the cable.

[0021] Optionally, the system further comprises a burn-through source module, and an output end of the burn-through source module is configured to be connected with the cable.

[0022] The burn-through source module is configured to generate a third voltage when a corresponding resistance value of the cable fault is a first value, transmit the third voltage into the cable, so that the corresponding resistance value of the cable fault becomes a second value, and the first value is greater than the second value, and the third voltage is a voltage for breaking down the insulation of the cable fault.

[0023] Optionally, the system further comprises a second fault detection unit, an output end of the second fault detection unit being connected with an input end of the signal generation unit;

[0024] The second fault detection unit is configured to transmit the detected fault signal to the signal generation unit when detecting that the cable has a fault;

[0025] The signal generation unit is configured to generate the pulse voltage after receiving the fault signal.

[0026] Through the above technical solution, when the cable has a fault, the signal generation unit generates a pulse voltage, transmits the pulse voltage into the cable, and receives the feedback electrical signal of the cable, and transmits the electrical signal into the first fault detection unit. Then, in the first fault detection unit, after receiving the electrical signal, a test signal is generated and input into the cable to detect the distance range of the fault of the cable. Compared with the method of testing the fault in the cable by insulation test and withstand voltage test in the related art, the fault distance range of the cable can be directly detected through the connection between the modules, the detection accuracy can be improved, and the detection efficiency can also be improved.

[0027] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0029] Figure 1 FIG. 1 is a schematic diagram illustrating a cable fault detection system according to an exemplary embodiment of the present disclosure.

[0030] Figure 2 FIG. 2 is a schematic diagram illustrating a sea pump house and a brick factory switching station according to an exemplary embodiment of the present disclosure.

[0031] LEGEND OF DRAWINGS

[0032] 1, cable fault detection system; 2, signal generation unit; 3, first fault detection unit; 4, cable; 5, sea pump house switching station; 6, brick factory switching station; 7, ash removal switching station; 8, brick factory cable; 9, power distribution room; 10, ash storage switching station; 11, work station. DETAILED DESCRIPTION

[0033] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0034] In related technologies, faults in cables are mainly found through insulation testing and withstand voltage testing. Insulation testing involves measuring the resistance value of the cable insulation layer and evaluating the insulation performance of the cable based on the resistance value. Withstand voltage testing mainly involves applying a DC or AC voltage higher than the rated voltage to the cable and continuing it for a certain period of time to verify the cable's ability to withstand overvoltage.

[0035] However, the inventors discovered that when locating cable faults through insulation testing and withstand voltage testing, the accuracy and precision of finding fault points on the cable are poor, and the positioning efficiency is slow.

[0036] In view of this, this disclosure provides a cable fault detection system to solve the technical problems existing in the aforementioned related technologies.

[0037] like Figure 1 As shown, Figure 1 This is a schematic diagram illustrating a cable fault detection system 1 according to an exemplary embodiment of the present disclosure, with reference to... Figure 1 This system is used to detect underground cables 4 between the sea pump house and the brick factory cable transfer station. The cable 4 fault detection system includes a signal generation unit 2 and a first fault detection unit 3. The output end of the signal generation unit 2 is connected to the input end of the first fault detection unit 3. Both the output end of the signal generation unit 2 and the output end of the first fault detection unit 3 are used to connect to the cable 4.

[0038] The signal generating unit 2 is used to generate a pulse voltage when the cable 4 fails, transmit the pulse voltage to the cable 4, and receive the feedback electrical signal from the cable 4 and transmit the electrical signal to the first fault detection unit 3.

[0039] The first fault detection unit 3 is used to generate a test signal after receiving the electrical signal, and input the test signal into the cable 4 to detect the distance range of the cable 4 where the fault occurred.

[0040] By the technical solution, when the cable 4 fails, the signal generating unit 2 generates a pulse voltage, transmits the pulse voltage into the cable 4, and receives the feedback electrical signal of the cable 4, and transmits the electrical signal into the first fault detection unit 3. Then in the first fault detection unit 3, after receiving the electrical signal, a test signal is generated and input into the cable 4 to detect the distance range of the failure of the cable 4. Compared with the related art, the failure in the cable 4 is tested by the insulation test and the withstand voltage test method, the failure distance range of the cable 4 can be directly detected by the connection between the modules, the detection accuracy can be improved, and the detection efficiency can also be improved.

[0041] In order for those skilled in the art to better understand the cable 4 fault detection system provided by the present disclosure, the above steps are described in detail below.

[0042] For example, the sea pump house can be used for power supply, water pump system or submarine cable 4 switching of offshore or nearshore facilities. The brick factory cable switching station can be used for the connection of overhead lines and underground cables 4. In the embodiment of the present disclosure, as shown in Figure 2 The sea pump house switching station 5, the brick factory switching station 6, the ash storage switching station 10, the distribution room 9, the desulfurization variable brick factory cable 8, the ash removal switching station 7 and the workstation 11 are included, so as to ensure the stable operation of the sea pump house.

[0043] The signal generating unit 2 can be used to generate various types of electrical signals, which can include high-voltage pulse signals, low-voltage pulse signals, sine wave signals, square wave signals and the like. The pulse voltage can be a voltage signal with a short duration and discontinuity. In the embodiment of the present disclosure, when the cable 4 fails, different types of voltage can be transmitted to the cable 4 by the signal generating unit 2, and the electrical signal feedback by the cable 4 can be obtained. Specifically, a pulse voltage can be generated, which can be a low-voltage pulse signal or a high-voltage pulse signal. The present disclosure does not make specific limitations. When the pulse voltage is sent to the cable 4, the position corresponding to the failure of the cable 4 can feedback an electrical signal to the signal generating unit 2, and after the signal generating unit 2 receives the electrical signal, the electrical signal is transmitted to the first fault detection unit 3. The electrical signal can be a current signal or a voltage signal. The signal generating unit 2 can be a signal generator, and the present disclosure does not make specific limitations.

[0044] The first fault detection unit 3 can be used to detect the distance range of the fault of the cable 4. Specifically, after receiving the electrical signal, the first fault detection unit 3 can generate a test signal and send the test signal into the cable 4 to detect the distance range of the fault of the cable 4. The test signal can be a pulse signal, which is not limited in the embodiments of the present disclosure. The first fault detection unit 3 can be a fault detector. When detecting the distance range of the fault of the cable 4, after sending the test signal into the cable 4, the cable 4 can generate a reflection signal corresponding to the test signal at the position corresponding to the fault, and send the reflection signal into the fault detector. After receiving the reflection signal, the fault detector can calculate the distance range of the fault of the cable 4 by using the reflection principle and the Hankel theory in the related art, which is not limited in the embodiments of the present disclosure.

[0045] By the above technical solution, the pulse voltage is generated by the signal generation unit 2, transmitted into the cable 4, and the feedback electrical signal of the cable 4 is received and transmitted into the first fault detection unit 3. Then, in the first fault detection unit 3, after receiving the electrical signal, the test signal is generated and input into the cable 4 to detect the distance range of the fault of the cable 4. Compared with the method of testing the fault in the cable 4 by insulation test and voltage test in the related art, the fault distance range of the cable 4 can be directly detected by the connection between the modules, which can improve the detection accuracy and efficiency.

[0046] In a possible manner, the signal generation unit 2 includes a power supply module, a voltage boosting module, and a control module. The output end of the power supply module is connected with the input end of the voltage boosting module. The output end of the voltage boosting module is connected with the input end of the control module. The output end of the control module is connected with the input end of the first fault detection unit 3. The output end of the control module is also used to connect the cable 4.

[0047] The power supply module is configured to generate a first voltage and transmit the first voltage into the voltage boosting module.

[0048] The voltage boosting module is configured to increase the first voltage to a second voltage and transmit the second voltage into the control module.

[0049] The control module is configured to generate the pulse voltage according to the second voltage, transmit the pulse voltage into the cable 4, receive the electrical signal fed back by the cable 4, and transmit the electrical signal into the first fault detection unit 3.

[0050] It should be understood that the power module can be used to provide a signal source, which can be used to detect the distance range of the failure of the cable 4, and the power module can be a power supply or a battery. The voltage boosting module is a device that can boost the voltage. The control module can be used to adjust the output voltage, current and protection function. Among them, the control module can be an FPGA controller (Field-Programmable Gate Array, Field-Programmable Gate Array controller), and the embodiments of the present disclosure do not make specific limitations on this.

[0051] In the embodiments of the present disclosure, when the cable 4 fails, the power module in the signal generating unit 2 can generate a first voltage, and in the voltage boosting module, the first voltage is boosted to a second voltage, and in the control module, a pulse voltage is generated according to the second voltage. Among them, the pulse voltage generated according to the second voltage can be processed by the method in the related art, and details are not repeated. Then the pulse voltage can be sent to the cable 4, and the cable 4 can feed back an electrical signal to the control module at the failure position, and the control module sends the electrical signal to the first fault detection unit 3 for processing after receiving the electrical signal, to detect the distance range of the failure of the cable 4, and the embodiments of the present disclosure do not make specific limitations on this.

[0052] In a possible manner, the voltage boosting module is a transformer and / or an electronic voltage boosting module.

[0053] It should be understood that in the embodiments of the present disclosure, the voltage boosting module can be a transformer, which can be a transformer that boosts the voltage. Or an electronic voltage boosting module, which can be a module that converts the input DC voltage into a higher output voltage. Or the voltage boosting module is a combination of both, that is, it includes a transformer and an electronic voltage boosting module, which is used to boost the first voltage to the second voltage.

[0054] In a possible manner, the signal generating unit 2 further comprises a first protection module, and the first protection module is connected with the control module.

[0055] The first protection module is used to monitor whether the threshold value of the pulse voltage is greater than a first threshold value and / or the second voltage is greater than a second threshold value, and cut off the first relay and / or the second relay. The first relay is a relay for controlling the input of the control module, and the second relay is a relay for controlling the output of the control module.

[0056] It should be understood that during the working process of the signal generating unit 2, the voltage or current may be too large, so that the first protection module can be arranged in the signal generating power supply to protect the normal and stable operation of the signal generating unit 2. The first protection module is used to detect the pulse voltage and the second voltage in real time, and when the pulse voltage is greater than the first threshold or the second voltage is greater than the second threshold, it can be represented that an overvoltage or overcurrent condition occurs in the signal generating unit 2 at this time, so that the voltage input to the control module or the voltage output of the control module can be controlled by cutting off the first relay or the second relay. Wherein, the relationship between the pulse voltage and the first threshold, and the relationship between the second voltage and the second threshold in the first protection module are determined by the method in the related art, which will not be described here.

[0057] In a possible manner, the signal output end of the signal generating unit 2 is used to connect the first phase line of the cable 4, and the ground end of the signal generating unit 2 is used to connect the second phase line of the cable 4, wherein the first phase line is different from the second phase line.

[0058] It should be understood that when the signal generating unit 2 is a signal generator, the red line of the signal generating unit 2 can be connected with the first phase line of the cable 4, wherein the red line can be the output end of the signal generating unit 2. The black line of the signal generating unit 2 is connected with the second phase line of the cable 4, wherein the black line can be the input end of the signal generating unit 2, which is not limited in the embodiment of the present disclosure.

[0059] In a possible manner, the system further comprises a second protection module connected with the ground wire of the cable 4.

[0060] The second protection module is used to release the electric charge on the cable 4 after the signal generating unit 2 completes the work.

[0061] It should be understood that when the signal generating unit 2 sends the pulse voltage to the cable 4 and completes the work, there will still be a certain amount of electric charge in the cable 4, and there will be a certain risk when the relevant operating personnel operates the cable 4, so that the second protection module can be arranged to release the remaining electric charge in the cable 4 after the signal generating unit 2 completes the work, thereby improving the safety of the relevant operating personnel.

[0062] In a possible manner, the second protection module is a discharge rod.

[0063] It should be understood that the discharge rod can be used for safely releasing the residual charge of the electrical equipment. It is widely used in high-voltage testing, power maintenance, capacitor discharge and other scenes. In this way, the risk of electric shock or equipment damage can be prevented, and the operation safety of the relevant operator can be ensured. In the embodiment of the present disclosure, the second protection module can be a discharge rod. When the fault of the cable 4 is determined to be completed, the cable 4 can be charged. Therefore, the excess charge on the cable 4 can be released through the discharge rod to avoid the risk of subsequent operation of the cable 4 by the relevant operator.

[0064] In a possible manner, the system further comprises a fault locating unit connected with the first fault detection unit 3.

[0065] The first fault detection unit 3 is further configured to send the distance range to the fault locating unit.

[0066] The fault locating unit is configured to receive the distance range to locate the fault position of the cable 4.

[0067] It should be understood that the distance range of the cable 4 measured by the first fault detection unit 3 is located within a certain distance range, but the specific fault position can be found by the fault locating unit. The fault locating unit can be used to accurately locate the fault position of the cable 4. In the embodiment of the present disclosure, after the first fault detection unit 3 detects the distance range, the distance range can be sent to the fault locating unit. The fault locating unit can determine the fault position of the cable 4 according to the distance range. The method for determining the fault position of the cable 4 according to the distance range is realized by the method in the related art, and will not be described here.

[0068] By setting the fault locating unit, the fault position of the cable 4 can be located, and the accurate positioning of the fault position of the cable 4 can be realized, and the efficiency of the fault positioning of the cable 4 can be improved.

[0069] In a possible manner, the system further comprises a burn-through source module, and an output end of the burn-through source module is configured to be connected with the cable 4.

[0070] The burn-through source module is configured to generate a third voltage when the resistance value corresponding to the fault position of the cable 4 is a first value, and transmit the third voltage to the cable 4, so that the resistance value corresponding to the fault position of the cable 4 becomes a second value. The first value is greater than the second value, and the third voltage is a voltage for breaking down the insulation of the cable 4 fault.

[0071] It should be understood that the burn-through source module can be used for the device for locating the high resistance fault. The fault can be broken down by applying a high voltage or a large current to the high resistance fault, so that the resistance corresponding to the fault is low. In the embodiment of the present disclosure, when the cable 4 fault is in a high resistance fault, that is, in an insulation state or an open circuit state, the resistance value corresponding to the fault is a first value. Then the third voltage generated by the burn-through source module can be used to break down the cable 4 fault, until the resistance value corresponding to the cable 4 fault changes from the first value to a second value, and the fault can be located.

[0072] By applying the third voltage to the cable 4 to break down the cable 4 fault, the accuracy of locating the cable 4 fault can be improved.

[0073] In a possible manner, the system further comprises a second fault detection unit, and an output end of the second fault detection unit is connected to an input end of the signal generation unit 2.

[0074] The second fault detection unit is configured to transmit a detected fault signal to the signal generation unit 2 when detecting that the cable 4 has a fault.

[0075] The signal generation unit 2 is configured to generate the pulse voltage after receiving the fault signal.

[0076] It should be understood that the second fault detection unit can be used to detect whether the cable 4 has a fault. In the sea pump house and the brick factory cable switching station, when the cable 4 has a fault, it is not determined which section of the cable 4 has a fault. At this time, all the cables 4 can be disconnected from the power supply, and the second fault detection unit can be used to detect which section of the cable 4 has a fault. When the cable 4 fault is detected, a fault signal is transmitted to the signal generation unit 2. The signal generation unit 2 generates a pulse voltage after receiving the fault signal, and sends the pulse voltage to the cable 4.

[0077] By the above technical solution, modules with different functions are set, the position of the cable 4 fault is located, the interference on the line can be avoided, the positioning efficiency and the positioning accuracy can be improved, and the operation efficiency and safety and reliability of the high-voltage cable 4 device can be improved.

[0078] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0079] It should be further noted that various specific technical features described in the above specific embodiments can be combined in any suitable manner, and the disclosure will not be repeated here for various possible combinations.

[0080] In addition, various different embodiments of the disclosure can also be combined with each other as long as they do not contradict the idea of the disclosure, and they should also be considered as disclosed by the disclosure.

Claims

1. A cable fault detection system characterized by, The application relates to a cable (4) fault detection system for detecting a cable (4) laid underground between a sea pump house and a brick factory cable switching station, which comprises a signal generating unit (2) and a first fault detection unit (3), wherein the output end of the signal generating unit (2) is connected with the input end of the first fault detection unit (3), and the output end of the signal generating unit (2) and the output end of the first fault detection unit (3) are both used for connecting the cable (4). The signal generating unit (2) is used for generating a pulse voltage when the cable (4) fails, transmitting the pulse voltage into the cable (4), receiving the feedback electric signal of the cable (4), and transmitting the electric signal into the first fault detection unit (3). The first fault detection unit (3) is used for generating a test signal after receiving the electric signal, inputting the test signal into the cable (4), and detecting the distance range of the cable (4) failure.

2. The cable fault detection system of claim 1, wherein, The signal generating unit (2) comprises a power supply module, a voltage boosting module and a control module, the output end of the power supply module is connected with the input end of the voltage boosting module, the output end of the voltage boosting module is connected with the input end of the control module, the output end of the control module is connected with the input end of the first fault detection unit (3), and the output end of the control module is also used for connecting the cable (4). The power supply module is used for generating a first voltage and transmitting the first voltage into the voltage boosting module. The voltage boosting module is used for raising the first voltage into a second voltage and transmitting the second voltage into the control module. The control module is used for generating the pulse voltage according to the second voltage, transmitting the pulse voltage into the cable (4), receiving the feedback electric signal of the cable (4), and transmitting the electric signal into the first fault detection unit (3).

3. The cable fault detection system of claim 2, wherein, The voltage boosting module is a transformer and / or an electronic voltage boosting module.

4. The cable fault detection system of claim 2, wherein, The signal generating unit (2) further comprises a first protection module connected with the control module. The first protection module is used for monitoring that the threshold value of the pulse voltage is greater than a first threshold value and / or the second voltage is greater than a second threshold value, cutting off a first relay and / or a second relay, the first relay is a relay for controlling the input of the control module, and the second relay is a relay for controlling the output of the control module.

5. The cable fault detection system of any one of claims 1-4, wherein, The signal output end of the signal generating unit (2) is used for connecting a first phase line of the cable (4), and the grounding end of the signal generating unit (2) is used for connecting a second phase line of the cable (4), wherein the first phase line is different from the second phase line.

6. The cable fault detection system of claim 1, wherein, The system further comprises a second protection module connected with the grounding line of the cable (4). The second protection module is used for releasing the electric charge on the cable (4) after the signal generating unit (2) completes work.

7. The cable fault detection system of claim 6, wherein, The second protection module is a discharge rod.

8. The cable fault detection system of claim 1, wherein, The system further comprises a fault locating unit connected with the first fault detecting unit (3); The first fault detecting unit (3) is further configured to send the distance range to the fault locating unit; The fault locating unit is configured to receive the distance range to locate the fault position of the cable (4).

9. The cable fault detection system of claim 1, wherein, The system further comprises a burn-through source module, an output end of the burn-through source module being configured to be connected with the cable (4); The burn-through source module is configured to generate a third voltage when a corresponding resistance value of the cable (4) at the fault position is a first value, and transmit the third voltage into the cable (4) to change the corresponding resistance value of the cable (4) at the fault position to a second value, wherein the first value is greater than the second value, and the third voltage is a voltage for breaking down the insulation of the cable (4) at the fault position.

10. The cable fault detection system of claim 1, wherein, The system further comprises a second fault detecting unit, an output end of the second fault detecting unit being connected with an input end of the signal generating unit (2); The second fault detecting unit is configured to transmit a detected fault signal to the signal generating unit (2) when detecting that the cable (4) has a fault; The signal generating unit (2) is configured to generate the pulse voltage after receiving the fault signal.

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