CN110763955A - Cable fault detection system and method based on high-voltage pulse signal injection - Google Patents
Cable fault detection system and method based on high-voltage pulse signal injection Download PDFInfo
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- CN110763955A CN110763955A CN201911228903.4A CN201911228903A CN110763955A CN 110763955 A CN110763955 A CN 110763955A CN 201911228903 A CN201911228903 A CN 201911228903A CN 110763955 A CN110763955 A CN 110763955A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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Abstract
The invention provides a cable fault detection system based on high-voltage pulse signal injection, which comprises a signal injection unit, a signal acquisition unit, a signal conditioning unit, a control processing unit, a key input unit, a storage unit, a display unit, an alarm unit and a communication unit, wherein the signal injection unit is used for injecting a high-voltage pulse signal; the cable fault detection system injects high-voltage pulse signals into the power cable, collects fault signals when the cable is in fault, analyzes and judges whether the power cable is in fault and the fault position, and ensures the safety and reliability of the power cable. The invention provides a cable fault detection system and method based on high-voltage pulse signal injection, which can accurately judge whether a cable has a fault or not so as to reduce loss.
Description
Technical Field
The invention belongs to the technical field of power detection, and particularly relates to a cable fault detection system and method based on high-voltage pulse signal injection.
Background
With the continuous progress of science and technology and the continuous development of social economy, the power system is also well developed and applied. Power cables are important components of power systems, and are increasingly constructed in an underground laying manner in the development and application processes of power cables. Due to factors such as the complexity of laying conditions and the influence of daily use environment, the fault of the power cable occurs at times, the safe operation of a power system and the daily life of people are influenced, and even safety accidents are caused, and the life and property safety of people is harmed. Because power cable trouble often leads to the large tracts of land to have a power failure to stop production, if can find the fault point fast, shorten the rush-repair time, reduction economic loss that can be great reduces the influence of trouble to people's life to furthest.
The invention provides a cable fault detection system based on high-voltage pulse signal injection, which is used for collecting corresponding signals when a power cable is in fault, analyzing and judging whether the cable is in fault and fault points or not and ensuring the safety and reliability of the power cable.
Disclosure of Invention
The invention provides a cable fault detection system and method based on high-voltage pulse signal injection, which can accurately judge whether a cable has a fault or not so as to reduce loss.
The invention particularly relates to a cable fault detection system based on high-voltage pulse signal injection, which comprises a signal injection unit, a signal acquisition unit, a signal conditioning unit, a control processing unit, a key input unit, a storage unit, a display unit, an alarm unit and a communication unit, wherein the signal injection unit is respectively connected with a power cable and the control processing unit; the cable fault detection system injects high-voltage pulse signals into the power cable, collects fault signals when the cable is in fault, analyzes and judges whether the power cable is in fault and the fault position, and ensures the safety and reliability of the power cable.
The signal injection unit adopts the signal generator to generate a high-voltage pulse signal, and when the cable breaks down, the high-voltage pulse signal can enable the fault point to generate flashover and generate a sound signal.
The signal acquisition unit comprises a sound sensor and a voltage sensor, the sound sensor acquires the sound signal, and the voltage sensor acquires the pulse signal.
The signal conditioning unit comprises a signal amplification module, a filtering module and an A/D conversion module, wherein the signal amplification module adopts an amplification circuit to amplify the acquired signal and outputs a signal meeting the input requirement of the A/D conversion module; the filtering module filters high-frequency interference signals by adopting a low-pass filter.
The key input unit is combined with the storage unit and the display unit to carry out parameter setting and information query on the cable fault detection system, and the parameters comprise sound reference values.
The alarm unit adopts an audible and visual alarm, and can send out audible and visual alarm signals in time when the cable breaks down.
The communication unit uploads the detection information of the cable fault detection system to a monitoring center by adopting a wireless communication technology, and meanwhile, the communication unit can also remotely operate the cable fault detection system.
The invention also provides a detection method of the cable fault detection system based on high-voltage pulse signal injection, which comprises the following steps:
step (1): the signal injection unit injects the high-voltage pulse signal into the cable;
step (2): the signal acquisition unit acquires the sound signal and the pulse signal;
and (3): amplifying the acquired signals by the signal amplification module;
and (4): filtering processing is carried out through the filtering module;
and (5): A/D conversion is carried out through the A/D conversion module;
and (6): the control processing unit compares the sound signal with the sound reference value, and if the sound signal is greater than the sound reference value, the step (7) is carried out; if the sound reference value is not greater than the sound reference value, returning to the step (2);
and (7): performing wavelet transform on the pulse signala is a scale factor, #a(x) In order to be a function of the scale,psi (x) is a mother wavelet;
and (8): extracting the pulse signal Waf the median maximum value of (x);
and (9): the maximum value corresponds to the cable fault point;
step (10): sending out a fault alarm signal through the alarm unit;
step (11): displaying the specific fault condition through the display unit;
step (12): and uploading the detection result of the power cable fault detection system to the monitoring center through the communication unit.
Compared with the prior art, the beneficial effects are: the power cable fault detection system injects a high-voltage pulse signal into the cable, can timely acquire a fault signal when the power cable breaks down, and determines a fault point through judgment and analysis so that a worker can timely process the fault point.
Drawings
Fig. 1 is a flowchart of the operation of a method for detecting a cable fault detection system based on high-voltage pulse signal injection according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of a cable fault detection system based on high-voltage pulse signal injection according to the present invention with reference to the accompanying drawings.
The cable fault detection system comprises a signal injection unit, a signal acquisition unit, a signal conditioning unit, a control processing unit, a key input unit, a storage unit, a display unit, an alarm unit and a communication unit, wherein the signal injection unit is respectively connected with a power cable and the control processing unit, the power cable is sequentially connected with the signal acquisition unit, the signal conditioning unit and the control processing unit, and the control processing unit is also respectively connected with the key input unit, the storage unit, the display unit, the alarm unit and the communication unit; the cable fault detection system injects high-voltage pulse signals into the power cable, collects fault signals when the cable is in fault, analyzes and judges whether the power cable is in fault and the fault position, and ensures the safety and reliability of the power cable.
The signal injection unit adopts the signal generator to generate a high-voltage pulse signal, and when the cable breaks down, the high-voltage pulse signal can enable the fault point to generate flashover and generate a sound signal.
The signal acquisition unit comprises a sound sensor and a voltage sensor, the sound sensor acquires the sound signal, and the voltage sensor acquires the pulse signal.
The signal conditioning unit comprises a signal amplification module, a filtering module and an A/D conversion module, wherein the signal amplification module adopts an amplification circuit to amplify the acquired signal and outputs a signal meeting the input requirement of the A/D conversion module; the filtering module filters high-frequency interference signals by adopting a low-pass filter.
The key input unit is combined with the storage unit and the display unit to carry out parameter setting and information query on the cable fault detection system, and the parameters comprise sound reference values.
The alarm unit adopts an audible and visual alarm, and can send out audible and visual alarm signals in time when the cable breaks down.
The communication unit uploads the detection information of the cable fault detection system to a monitoring center by adopting a wireless communication technology, and meanwhile, the communication unit can also remotely operate the cable fault detection system.
As shown in fig. 1, the present invention further provides a detection method of a cable fault detection system based on high-voltage pulse signal injection, where the detection method includes the following steps:
step (1): the signal injection unit injects the high-voltage pulse signal into the cable;
step (2): the signal acquisition unit acquires the sound signal and the pulse signal;
and (3): amplifying the acquired signals by the signal amplification module;
and (4): filtering processing is carried out through the filtering module;
and (5): A/D conversion is carried out through the A/D conversion module;
and (6): the control processing unit compares the sound signal with the sound reference value, and if the sound signal is greater than the sound reference value, the step (7) is carried out; if the sound reference value is not greater than the sound reference value, returning to the step (2);
and (7): performing wavelet transform on the pulse signal
a is a scale factor, #a(x) In order to be a function of the scale,
psi (x) is a mother wavelet;
and (8): extracting the pulse signal Waf the median maximum value of (x);
and (9): the maximum value corresponds to the cable fault point;
step (10): sending out a fault alarm signal through the alarm unit;
step (11): displaying the specific fault condition through the display unit;
step (12): and uploading the detection result of the power cable fault detection system to the monitoring center through the communication unit.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A cable fault detection system based on high-voltage pulse signal injection is characterized by comprising a signal injection unit, a signal acquisition unit, a signal conditioning unit, a control processing unit, a key input unit, a storage unit, a display unit, an alarm unit and a communication unit, wherein the signal injection unit is respectively connected with a power cable and the control processing unit; the cable fault detection system injects high-voltage pulse signals into the power cable, collects fault signals when the cable is in fault, analyzes and judges whether the power cable is in fault and the fault position, and ensures the safety and reliability of the power cable.
2. The system for detecting the cable fault based on the injection of the high-voltage pulse signal as claimed in claim 1, wherein the signal injection unit adopts a signal generator to generate the high-voltage pulse signal, and when the cable has a fault, the high-voltage pulse signal can enable the fault point to generate an arc-over and generate a sound signal.
3. The system for detecting the cable fault based on the injection of the high-voltage pulse signal as claimed in claim 2, wherein the signal acquisition unit comprises a sound sensor and a voltage sensor, the sound sensor acquires the sound signal, and the voltage sensor acquires the pulse signal.
4. The cable fault detection system based on high-voltage pulse signal injection as claimed in claim 3, wherein the signal conditioning unit comprises a signal amplification module, a filtering module, and an A/D conversion module, wherein the signal amplification module adopts an amplification circuit to amplify the acquired signal and outputs a signal meeting the input requirement of the A/D conversion module; the filtering module filters high-frequency interference signals by adopting a low-pass filter.
5. The system according to claim 4, wherein the key input unit is used for setting parameters and inquiring information of the cable fault detection system in combination with the storage unit and the display unit, and the parameters include sound reference values.
6. The system for detecting the cable fault based on the high-voltage pulse signal injection as claimed in claim 5, wherein the alarm unit is an audible and visual alarm, and the audible and visual alarm can be timely sent out when the cable is in fault.
7. The system according to claim 6, wherein the communication unit uses a wireless communication technology to upload detection information of the cable fault detection system to a monitoring center, and the communication unit is further capable of remotely operating the cable fault detection system.
8. The detection method of the cable fault detection system based on high-voltage pulse signal injection according to any one of claims 1 to 7, characterized in that the detection method comprises the following steps:
step (1): the signal injection unit injects the high-voltage pulse signal into the cable;
step (2): the signal acquisition unit acquires the sound signal and the pulse signal;
and (3): amplifying the acquired signals by the signal amplification module;
and (4): filtering processing is carried out through the filtering module;
and (5): A/D conversion is carried out through the A/D conversion module;
and (6): the control processing unit compares the sound signal with the sound reference value, and if the sound signal is greater than the sound reference value, the step (7) is carried out; if the sound reference value is not greater than the sound reference value, returning to the step (2);
and (7): performing wavelet transform on the pulse signal
a is a scale factor, #a(x) In order to be a function of the scale,psi (x) is a mother wavelet;
and (8): extracting the pulse signal Waf the median maximum value of (x);
and (9): the maximum value corresponds to the cable fault point;
step (10): sending out a fault alarm signal through the alarm unit;
step (11): displaying the specific fault condition through the display unit;
step (12): and uploading the detection result of the power cable fault detection system to the monitoring center through the communication unit.
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| CN112731057A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Offline low-voltage cable ground fault positioning device based on pulse coding |
| CN116593830A (en) * | 2023-07-17 | 2023-08-15 | 天津市小猫线缆股份有限公司 | Cable fault detection system and detection method |
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Application publication date: 20200207 |