CN111103502A - Power transmission cable detection system based on multiple signal acquisition - Google Patents

Power transmission cable detection system based on multiple signal acquisition Download PDF

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Publication number
CN111103502A
CN111103502A CN201911082419.5A CN201911082419A CN111103502A CN 111103502 A CN111103502 A CN 111103502A CN 201911082419 A CN201911082419 A CN 201911082419A CN 111103502 A CN111103502 A CN 111103502A
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Prior art keywords
cable
unit
alarm
signal
voltage
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王震宇
蔡兴涛
沈成
邹海东
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Jiangsu Maoyuan Electrical Co ltd
State Grid Corp of China SGCC
Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Dongtai Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Original Assignee
Jiangsu Maoyuan Electrical Co ltd
State Grid Corp of China SGCC
Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Dongtai Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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Priority to CN201911082419.5A priority Critical patent/CN111103502A/en
Publication of CN111103502A publication Critical patent/CN111103502A/en
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    • G—PHYSICS
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

The invention provides a power transmission cable detection system based on multiple signal acquisition, which comprises a signal acquisition unit, a filtering unit, an A/D conversion unit, a control processing unit, a video monitoring unit, a key input unit, a display unit, a storage unit, an alarm unit and a communication unit, wherein the signal acquisition unit is used for acquiring a plurality of signals; the cable detection system respectively collects various working information of the cable, compares the working information with a preset alarm value and judges the working state of the cable, and can take solving measures in time when abnormity occurs, so that the safety and reliability of the cable are improved. The invention provides a power transmission cable detection system based on multiple signal acquisition, which can accurately judge the safe operation of a cable by combining the actual working state of the cable, thereby improving the power supply reliability of a power system.

Description

Power transmission cable detection system based on multiple signal acquisition
Technical Field
The invention belongs to the technical field of power detection, and particularly relates to a power transmission cable detection system based on multiple signal acquisition.
Background
With the continuous development of science and technology, the living standard of people is higher and higher, and the demand on electric power is also higher and higher. The transmission line is used as an important component of the power system, and the safe operation of the transmission line is an important guarantee for ensuring the safety and the reliability of the power system.
In order to ensure the safe operation of the transmission line, the transmission cable needs to be effectively detected, and the detected current and voltage signals are generally compared and judged with preset reference values, but the accuracy of the detection method is not good because the working environment of the cable is affected by various factors and the performance of the cable in all aspects of long-term operation is degraded. The power transmission cable detection system based on multiple signal acquisition is provided, actual current-carrying capacity calculation is carried out according to the actual working state of the cable, the actual current-carrying capacity calculation is compared with the acquired current signals, meanwhile, temperature and voltage signals of the cable are acquired, analysis and judgment are carried out, and therefore the accuracy of the detection system is improved.
Disclosure of Invention
The invention provides a power transmission cable detection system based on multiple signal acquisition, which can accurately judge the safe operation of a cable by combining the actual working state of the cable, thereby improving the power supply reliability of a power system.
The invention particularly relates to a power transmission cable detection system based on multiple signal acquisition, which comprises a signal acquisition unit, a filtering unit, an A/D conversion unit, a control processing unit, a video monitoring unit, a key input unit, a display unit, a storage unit, an alarm unit and a communication unit, wherein the control processing unit is also respectively connected with the video monitoring unit, the key input unit, the display unit, the storage unit, the alarm unit and the communication unit; the cable detection system respectively collects various working information of the cable, compares the working information with a preset alarm value and judges the working state of the cable, and can take solving measures in time when abnormity occurs, so that the safety and reliability of the cable are improved.
The signal acquisition unit comprises a voltage sensor, a current sensor, a first temperature sensor and a second temperature sensor, and is used for respectively acquiring a cable voltage signal, a current signal, a wire core temperature signal and an environment temperature signal.
The video monitoring unit comprises a camera and a video monitoring terminal, the video monitoring terminal receives the control signal sent by the control processing unit to control the position, the angle, the focal length, the aperture and the rotating speed of the camera, and uploads a monitoring picture to the monitoring center.
The key input unit is combined with the storage unit and the display unit to set parameters, and can also selectively check monitoring results; the parameters comprise related information of the cable, a first voltage alarm value, a second voltage alarm value and an ambient temperature alarm value;
the alarm unit adopts an audible and visual alarm and sends out an alarm signal when the current of the cable is abnormal; the communication unit uploads monitoring information to a monitoring center by adopting a wireless communication technology, and can receive a control instruction of the monitoring center.
The control processing unit calculates the actual current-carrying capacity of the cable according to the related information of the cable, the core temperature signal and the environment temperature signal:
Figure BDA0002264361340000021
T1for the core temperature signal, T2N is the number of the cable cores for the ambient temperature signal;
RAC＝RDC(1+ys+yp) Is the AC resistance value, R, of the cableDCIs the direct current resistance, RDC＝R20[1+α20(T1-20)]，R20Is the direct current resistance value of the cable core at the temperature of 20 ℃, α20Providing a temperature coefficient of said cable core material at 20 ℃;
Figure BDA0002264361340000022
is a function of the skin effect factor,
Figure BDA0002264361340000023
f is the frequency, ksIs the skin effect factor coefficient;
Figure BDA0002264361340000024
in order to be a factor of the proximity effect,
Figure BDA0002264361340000025
kpcoefficient of proximity effect factor, dcThe diameter of the cable core is shown, and s is the distance between the axes of the cable cores;
Figure BDA0002264361340000026
for the loss factor of the metal sheath of the cable,
Figure BDA0002264361340000027
the resistance of the metal sleeve in unit length of the cable at the highest working temperature is defined, rho is the resistivity of the metal sleeve material of the cable, S is the sectional area of the metal sleeve of the cable, α is the temperature coefficient of the metal sleeve material of the cable, and η is the ratio of the temperature of the metal sleeve of the cable to the temperature of a wire core;
Figure BDA0002264361340000028
for the cable unit length goldThe reactance value of the metal sleeve is d, and d is the average diameter of the metal sleeve of the cable;
Figure BDA0002264361340000029
for the loss factor of the cable armor layer,
Figure BDA00022643613400000210
RAarmouring alternating current resistance in unit length of the cable at the highest working temperature;
Figure BDA0002264361340000031
for insulating the cable by a thermal resistance value, KTIs the thermal conductivity, t, of the cable insulation1The thickness between the cable core metal sleeves is the thickness;
Figure BDA0002264361340000032
is the thermal resistance value, t, of the inner sheath of the cable2For the thickness of the inner sheath of the cable, DsThe outer diameter of the cable metal sleeve;
Figure BDA0002264361340000033
is the thermal resistance, t, of the cable outer sheath3To the thickness of the outer sheath of the cable, DAThe cable car is arranged on the outer diameter of the mounting layer;
Figure BDA0002264361340000034
is the cable thermal resistance value, L is the distance from the cable axis to the earth's surface, DeIs the outer diameter of the cable.
The control processing unit analyzes and judges the acquired data:
comparing the environment temperature signal with the environment temperature alarm value, if the environment temperature signal is greater than the environment temperature alarm value, sending an abnormal environment temperature alarm through the alarm unit, sending the alarm signal to the monitoring center through the communication unit, and calling video information of the video monitoring unit in time;
comparing the voltage signal with the first voltage alarm value and the second voltage alarm value: if the voltage is smaller than the first voltage alarm value, sending a voltage low alarm through the alarm unit; if the voltage is larger than the second voltage alarm value, a voltage high alarm is sent out through the alarm unit; the alarm signal is sent to the monitoring center through the communication unit;
and comparing the current signal with the actual current-carrying capacity, and if the current signal is greater than the actual current-carrying capacity, sending out a current overrun alarm through the alarm unit and uploading the current overrun alarm to the monitoring center.
Drawings
Fig. 1 is a schematic structural diagram of a power transmission cable detection system based on multiple signal acquisition according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of a power transmission cable detection system based on multiple signal acquisition according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the cable detection system of the present invention includes a signal acquisition unit, a filtering unit, an a/D conversion unit, a control processing unit, a video monitoring unit, a key input unit, a display unit, a storage unit, an alarm unit, and a communication unit, wherein the control processing unit is further connected to the video monitoring unit, the key input unit, the display unit, the storage unit, the alarm unit, and the communication unit, respectively; the cable detection system respectively collects various working information of the cable, compares the working information with a preset alarm value and judges the working state of the cable, and can take solving measures in time when abnormity occurs, so that the safety and reliability of the cable are improved.
The signal acquisition unit comprises a voltage sensor, a current sensor, a first temperature sensor and a second temperature sensor, and is used for respectively acquiring a cable voltage signal, a current signal, a wire core temperature signal and an environment temperature signal.
The video monitoring unit comprises a camera and a video monitoring terminal, the video monitoring terminal receives the control signal sent by the control processing unit to control the position, the angle, the focal length, the aperture and the rotating speed of the camera, and uploads a monitoring picture to the monitoring center.
The key input unit is combined with the storage unit and the display unit to set parameters, and can also selectively check monitoring results; the parameters comprise related information of the cable, a first voltage alarm value, a second voltage alarm value and an ambient temperature alarm value;
the alarm unit adopts an audible and visual alarm and sends out an alarm signal when the current of the cable is abnormal; the communication unit uploads monitoring information to a monitoring center by adopting a wireless communication technology, and can receive a control instruction of the monitoring center.
The control processing unit calculates the actual current-carrying capacity of the cable according to the related information of the cable, the core temperature signal and the environment temperature signal:
Figure BDA0002264361340000041
T1for the core temperature signal, T2N is the number of the cable cores for the ambient temperature signal;
RAC＝RDC(1+ys+yp) Is the AC resistance value, R, of the cableDCIs the direct current resistance, RDC＝R20[1+α20(T1-20)]，R20Is the direct current resistance value of the cable core at the temperature of 20 ℃, α20Providing a temperature coefficient of said cable core material at 20 ℃;
Figure BDA0002264361340000042
is a function of the skin effect factor,
Figure BDA0002264361340000043
f is the frequency, ksIs the skin effect factor coefficient;
Figure BDA0002264361340000044
in order to be a factor of the proximity effect,
Figure BDA0002264361340000045
kpcoefficient of proximity effect factor, dcThe diameter of the cable core is shown, and s is the distance between the axes of the cable cores;
Figure BDA0002264361340000046
for the loss factor of the metal sheath of the cable,
Figure BDA0002264361340000047
the resistance of the metal sleeve in unit length of the cable at the highest working temperature is defined, rho is the resistivity of the metal sleeve material of the cable, S is the sectional area of the metal sleeve of the cable, α is the temperature coefficient of the metal sleeve material of the cable, and η is the ratio of the temperature of the metal sleeve of the cable to the temperature of a wire core;
Figure BDA0002264361340000051
the reactance value of the metal sleeve of the unit length of the cable is shown, and d is the average diameter of the metal sleeve of the cable;
Figure BDA0002264361340000052
for the loss factor of the cable armor layer,
Figure BDA0002264361340000053
RAarmouring alternating current resistance in unit length of the cable at the highest working temperature;
Figure BDA0002264361340000054
for insulating the cable by a thermal resistance value, KTIs the thermal conductivity, t, of the cable insulation1The thickness between the cable core metal sleeves is the thickness;
Figure BDA0002264361340000055
is the thermal resistance value, t, of the inner sheath of the cable2For the thickness of the inner sheath of the cable, DsThe outer diameter of the cable metal sleeve;
Figure BDA0002264361340000056
is the thermal resistance, t, of the cable outer sheath3To the thickness of the outer sheath of the cable, DAThe cable car is arranged on the outer diameter of the mounting layer;
Figure BDA0002264361340000057
is the cable thermal resistance value, L is the distance from the cable axis to the earth's surface, DeIs the outer diameter of the cable.
The control processing unit analyzes and judges the acquired data:
comparing the environment temperature signal with the environment temperature alarm value, if the environment temperature signal is greater than the environment temperature alarm value, sending an abnormal environment temperature alarm through the alarm unit, sending the alarm signal to the monitoring center through the communication unit, and calling video information of the video monitoring unit in time;
comparing the voltage signal with the first voltage alarm value and the second voltage alarm value: if the voltage is smaller than the first voltage alarm value, sending a voltage low alarm through the alarm unit; if the voltage is larger than the second voltage alarm value, a voltage high alarm is sent out through the alarm unit; the alarm signal is sent to the monitoring center through the communication unit;
and comparing the current signal with the actual current-carrying capacity, and if the current signal is greater than the actual current-carrying capacity, sending out a current overrun alarm through the alarm unit and uploading the current overrun alarm to the monitoring center.
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 (6)

1. A power transmission cable detection system based on multiple signal acquisition is characterized by comprising a signal acquisition unit, a filtering unit, an A/D conversion unit, a control processing unit, a video monitoring unit, a key input unit, a display unit, a storage unit, an alarm unit and a communication unit, wherein the control processing unit is also respectively connected with the video monitoring unit, the key input unit, the display unit, the storage unit, the alarm unit and the communication unit; the cable detection system respectively collects various working information of the cable, compares the working information with a preset alarm value and judges the working state of the cable, and can take solving measures in time when abnormity occurs, so that the safety and reliability of the cable are improved.
2. The multi-signal acquisition-based power transmission cable detection system according to claim 1, wherein the signal acquisition unit comprises a voltage sensor, a current sensor, a first temperature sensor and a second temperature sensor for respectively acquiring the cable voltage signal, the current signal, the core temperature signal and the ambient temperature signal.
3. The multi-signal-acquisition-based power transmission cable detection system according to claim 2, wherein the video monitoring unit comprises a camera and a video monitoring terminal, and the video monitoring terminal receives the control signal sent by the control processing unit to control the direction, angle, focal length, aperture and rotation speed of the camera, and uploads a monitoring picture to the monitoring center.
4. The power transmission cable detection system based on multiple signal acquisition is characterized in that the key input unit is combined with the storage unit and the display unit to perform parameter setting, and can also perform selective viewing on a monitoring result; the parameters comprise related information of the cable, a first voltage alarm value, a second voltage alarm value and an ambient temperature alarm value;
the alarm unit adopts an audible and visual alarm and sends out an alarm signal when the current of the cable is abnormal; the communication unit uploads monitoring information to a monitoring center by adopting a wireless communication technology, and can receive a control instruction of the monitoring center.
5. The multi-signal-acquisition-based power transmission cable detection system according to claim 4, wherein the control processing unit calculates the actual current-carrying capacity of the cable from the information about the cable, the core temperature signal and the ambient temperature signal:
Figure FDA0002264361330000011
T1for the core temperature signal, T2N is the number of the cable cores for the ambient temperature signal;
RAC＝RDC(1+ys+yp) Is the AC resistance value, R, of the cableDCIs the direct current resistance, RDC＝R20[1+α20(T1-20)]，R20Is the direct current resistance value of the cable core at the temperature of 20 ℃, α20Providing a temperature coefficient of said cable core material at 20 ℃;
Figure FDA0002264361330000012
is a function of the skin effect factor,
Figure FDA0002264361330000013
f is the frequency, ksIs the skin effect factor coefficient;
Figure FDA0002264361330000021
in order to be a factor of the proximity effect,
Figure FDA0002264361330000022
kpcoefficient of proximity effect factor, dcThe diameter of the cable core is shown, and s is the distance between the axes of the cable cores;
Figure FDA0002264361330000023
for the loss factor of the metal sheath of the cable,
Figure FDA0002264361330000024
the resistance of the metal sleeve in unit length of the cable at the highest working temperature is defined, rho is the resistivity of the metal sleeve material of the cable, S is the sectional area of the metal sleeve of the cable, α is the temperature coefficient of the metal sleeve material of the cable, and η is the ratio of the temperature of the metal sleeve of the cable to the temperature of a wire core;
Figure FDA0002264361330000025
the reactance value of the metal sleeve of the unit length of the cable is shown, and d is the average diameter of the metal sleeve of the cable;
Figure FDA0002264361330000026
for the loss factor of the cable armor layer,
Figure FDA0002264361330000027
RAarmouring alternating current resistance in unit length of the cable at the highest working temperature;
Figure FDA0002264361330000028
for insulating the cable by a thermal resistance value, KTIs the thermal conductivity, t, of the cable insulation1The thickness between the cable core metal sleeves is the thickness;
Figure FDA0002264361330000029
for the cable inner sheathThermal resistance value, t2For the thickness of the inner sheath of the cable, DsThe outer diameter of the cable metal sleeve;
Figure FDA00022643613300000210
is the thermal resistance, t, of the cable outer sheath3To the thickness of the outer sheath of the cable, DAThe cable car is arranged on the outer diameter of the mounting layer;
Figure FDA00022643613300000211
is the cable thermal resistance value, L is the distance from the cable axis to the earth's surface, DeIs the outer diameter of the cable.
6. The power transmission cable detection system based on multiple signal acquisition is characterized in that the control processing unit analyzes and judges the acquired data as follows:
comparing the environment temperature signal with the environment temperature alarm value, if the environment temperature signal is greater than the environment temperature alarm value, sending an abnormal environment temperature alarm through the alarm unit, sending the alarm signal to the monitoring center through the communication unit, and calling video information of the video monitoring unit in time;
comparing the voltage signal with the first voltage alarm value and the second voltage alarm value: if the voltage is smaller than the first voltage alarm value, sending a voltage low alarm through the alarm unit; if the voltage is larger than the second voltage alarm value, a voltage high alarm is sent out through the alarm unit; the alarm signal is sent to the monitoring center through the communication unit;
and comparing the current signal with the actual current-carrying capacity, and if the current signal is greater than the actual current-carrying capacity, sending out a current overrun alarm through the alarm unit and uploading the current overrun alarm to the monitoring center.
CN201911082419.5A 2019-11-07 2019-11-07 Power transmission cable detection system based on multiple signal acquisition Pending CN111103502A (en)

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CN111724937A (en) * 2020-06-30 2020-09-29 广州形银科技有限公司 Mine is with enhancement mode rubber cable
CN111913076A (en) * 2020-08-19 2020-11-10 国网江苏省电力有限公司盐城供电分公司 Power transmission line fault detection system and detection method thereof
CN112415465A (en) * 2020-10-21 2021-02-26 国网江苏省电力有限公司盐城供电分公司 Remote electric energy meter fault detection and identification system

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