CN212872735U - High-voltage cable running state monitoring device - Google Patents
High-voltage cable running state monitoring device Download PDFInfo
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- CN212872735U CN212872735U CN202021857262.7U CN202021857262U CN212872735U CN 212872735 U CN212872735 U CN 212872735U CN 202021857262 U CN202021857262 U CN 202021857262U CN 212872735 U CN212872735 U CN 212872735U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model discloses a high-voltage cable running state monitoring device, which comprises a power taking module, a fault early warning module, an accuracy verification module, a power failure protection module and a fault positioning module; the fault early warning module comprises a cable sheath current value acquisition unit, a vibration monitoring unit, a temperature monitoring unit and a data fusion early warning unit; respectively acquiring a sheath current value through a power frequency technology, measuring a cable body vibration value through a triaxial acceleration technology, and measuring a cable body temperature value through a temperature measurement technology; the fault location module comprises a high-speed fault information acquisition terminal, a GPS (global positioning system) and a Beidou time service device, and fault point location is carried out by adopting a D-type location principle; wherein the electricity taking module adopts an open-close type CT technology to realize self electricity taking. The utility model discloses form multidimension degree data and study and judge and carry out cable running state real-time supervision, carry out cross validation between the data, ensure the accuracy of data.
Description
Technical Field
The utility model relates to a high tension cable monitoring technology field, in particular to high tension cable running state monitoring devices.
Background
With the continuous development of economic technology, the application roles of power cables in the power industry are gradually increased, and power supply environments from 10kV to 220kV are gradually participated in. However, due to the characteristics of the circuit itself and the like, when a fault occurs, most faults are permanent faults and the difficulty of troubleshooting and first-aid repair is high. The prior art does not fully acquire and analyze the signal characteristics before the fault, and a corresponding technical means is lacked for cable fault early warning. Few running state monitoring devices to the cable lack comprehensive information monitoring means, and most of the devices only carry out single monitoring data to form a data isolated island, so that the comprehensive monitoring of the running state of the cable is realized wirelessly and accurately. Or most of the cable faults are judged by depending on the working experience of operators in the industry, the assistance of scientific and technical means is lacked, the efficiency is low, and the cable fault early warning cannot be accurately carried out. Therefore, a cable running state monitoring device is needed to realize multi-dimensional state information monitoring including multi-dimensional data information such as grounding current, temperature, vibration, current traveling wave and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the weak point to above-mentioned conventional art, provide a high tension cable running state monitoring devices.
In order to overcome the technical problem, the utility model discloses a technical scheme is:
a high voltage cable operating condition monitoring device comprising: the power supply system comprises a power taking module, a fault early warning module, an accuracy verification module and a power failure protection module;
the power taking module supplies power to the fault early warning module, the accuracy verification module and the power failure protection module;
the fault early warning module comprises: the device comprises a cable sheath current value acquisition unit, a vibration monitoring unit, a temperature monitoring unit and a data fusion early warning unit; the cable sheath current value acquisition unit, the vibration monitoring unit and the temperature monitoring unit are all used for monitoring data at a high-voltage cable joint and transmitting the data to the data fusion early warning unit for data fusion analysis to obtain a fault early warning result;
the accuracy verification module is used for studying and judging the multidimensional data, carrying out cross verification on the multidimensional data and ensuring accurate fault early warning;
the fault positioning module comprises a high-speed fault information acquisition terminal, a GPS (global positioning system) and a Beidou time service device, wherein the high-speed fault signal acquisition terminal is arranged at two ends of the monitoring cable, and is used for quickly reading and recording the arrival time of the initial fault traveling wave surge when a fault occurs; the GPS and Beidou time service device provides an accurate time reference for the high-speed fault signal acquisition terminal.
The power taking module comprises a power taking CT, a TVS protection circuit, a rectifier bridge, an energy leakage circuit, an energy leakage control circuit, an energy storage circuit, an output voltage monitoring circuit and an LDO voltage stabilizing circuit.
The electricity taking CT is in an open-close type, when the current reaches 3.5A, the electricity taking circuit is started to take electricity for the equipment, and therefore external power supply is not needed.
The rectifier bridge and the energy discharge circuit comprise: the half-controlled rectifier bridge circuit and the direct-current voltage amplitude limiting protection circuit realize rectification and direct-current voltage amplitude limiting protection; the direct-current voltage amplitude limiting protection circuit is composed of a voltage comparator and an RS trigger built by a discrete device, and hysteresis logic control is achieved.
The hysteresis logic control is that when the direct current voltage rises to 5V, the MOSFET is closed, so that the direct current voltage starts to fall, and after the direct current voltage falls to 4V, the MOSFET is opened, and the direct current voltage starts to fall. The hysteresis bandwidth from 5V to 4V is 1V, and the MOSFET switching frequency is reduced under the condition of large current.
The hysteretic logic control drives the MOSFET output by the push-pull circuit.
The output voltage monitoring and LDO voltage stabilizing circuit monitors the voltage at two ends of the capacitor, enables the LDO to output 3.3V when the voltage of the capacitor is higher than 3.8V, and forbids the LDO to output when the voltage drops to 3.36V again, so that the frequent restarting of the circuit caused by insufficient electric quantity is effectively prevented.
The cable sheath current numerical value acquisition unit adopts a circulating current acquisition circuit, the measured CT output current is subjected to I/V conversion through a 1ohm sampling resistor, then the I/V conversion is input into a true effective value conversion chip, a linear proportion direct current voltage is output, and then the measured current is calculated according to the acquired direct current voltage to realize the acquisition of the current; the main power rail of the circulation acquisition circuit is 3.3V, and the analog part is provided with a-3.3V power rail by a negative charge pump.
The vibration monitoring unit adopts an MPU-6050 triaxial acceleration and triaxial gyroscope sensor, and determines the motion condition of the cable in the three-dimensional direction according to the change conditions of the x, y and z triaxial directions, so that the vibration condition of the cable is monitored.
The temperature monitoring unit adopts a PT100 temperature sensor, realizes monitoring within a temperature range of-50-200 ℃, and ensures the monitoring accuracy of temperatures in different regions.
After the power supply is powered off, the system device can continue for a period of time by the power-off protection module, and the integrity of data collected at the moment of power-off is ensured.
The high-speed fault information acquisition terminal has a real-time clock with good accuracy and stability; the real-time clock runs synchronously, and various data at two ends of the line are ensured to be synchronously acquired at every moment.
And the fault location module adopts a D-type distance measurement principle to carry out fault point distance measurement.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a sheath current magnitude is gathered to power frequency technique, through triaxial acceleration technique measuring cable body vibration value, through temperature measurement technique measuring cable body temperature value, adopts ground current, vibration and temperature multidimension degree numerical value to synthesize simultaneously and study and judge, ensures the early warning accuracy.
The utility model discloses an open-close type CT technique realizes getting the electricity certainly, forms to get electricity and circulation monitoring, transmission integration to combine sheath current value, cable vibration value, cable temperature value to realize the real-time early warning of cable trouble according to corresponding algorithm, the very first time that appears unusually at the cable can carry out the early warning and inform relevant personnel, very big assurance cable life reduces the trouble simultaneously and takes place, reduces the fault rate.
The utility model discloses directly use D type range finding principle in the power supply cable monitoring, eliminated the complicated catadioptric process's of travelling wave influence on the one hand, on the other hand can directly confirm the circuit at fault point place, realizes the travelling wave location of circuit fault point. Therefore, accurate positioning of the cable fault position is realized, fault points and fault positions in the hybrid line are judged, operation and maintenance time is greatly shortened for operation and maintenance personnel, and power supply safety and timeliness are guaranteed.
Drawings
The invention will be described in further detail with reference to the following drawings and detailed description:
fig. 1 is a schematic view of the overall structure of a high-voltage cable operation state monitoring device of the present invention;
FIG. 2 is a schematic diagram of a power-taking module in the embodiment of the present invention;
FIG. 3 is a rectification energy release circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the present invention;
fig. 5 is a circuit diagram of the loop current collecting circuit in the embodiment of the present invention;
fig. 6 is a schematic diagram of the D-type distance measuring principle in the embodiment of the present invention.
Detailed Description
As can be seen in fig. 1: in this embodiment, a high tension cable running state monitoring devices includes: the power supply system comprises a power taking module, a fault early warning module, an accuracy verification module and a power failure protection module;
the power taking module supplies power to the fault early warning module, the accuracy verification module and the power failure protection module;
the fault early warning module comprises: the device comprises a cable sheath current value acquisition unit, a vibration monitoring unit, a temperature monitoring unit and a data fusion early warning unit; the cable sheath current value acquisition unit, the vibration monitoring unit and the temperature monitoring unit are all used for monitoring data at a high-voltage cable joint and transmitting the data to the data fusion early warning unit for data fusion analysis to obtain a fault early warning result;
the accuracy verification module is used for studying and judging the multidimensional data, carrying out cross verification on the multidimensional data and ensuring accurate fault early warning;
the fault positioning module comprises a high-speed fault information acquisition terminal, a GPS (global positioning system) and a Beidou time service device, wherein the high-speed fault signal acquisition terminal is arranged at two ends of the monitoring cable, and is used for quickly reading and recording the arrival time of the initial fault traveling wave surge when a fault occurs; the GPS and Beidou time service device provides an accurate time reference for the high-speed fault signal acquisition terminal.
The power-taking module in this embodiment is schematically shown in fig. 2, and includes a power-taking CT, a TVS protection, a rectifier bridge and a power-draining circuit, a power-draining control, an energy storage circuit, an output voltage monitoring and LDO voltage regulator circuit.
The electricity taking CT starts an electricity taking circuit to take electricity from equipment through an open-close CT technology when the current reaches 3.5A, so that external power supply is not needed.
In this embodiment, the rectifier bridge and the energy discharging circuit are shown in fig. 3, and include: the half-controlled rectifier bridge circuit and the direct-current voltage amplitude limiting protection circuit realize rectification and direct-current voltage amplitude limiting protection; the direct-current voltage amplitude limiting protection circuit is composed of RS triggers built by voltage comparators TLV3012 and TLV3491 and discrete device SN75LVC1G00, and hysteresis logic control is achieved.
The hysteresis logic control is that when the direct current voltage rises to 5V, the MOSFET is closed, so that the direct current voltage starts to fall, and after the direct current voltage falls to 4V, the MOSFET is opened, and the direct current voltage starts to fall. The hysteresis bandwidth from 5V to 4V is 1V, and the MOSFET switching frequency is reduced under the condition of large current.
The hysteretic logic control drives the MOSFET output by the push-pull circuit.
As shown in fig. 4, the output voltage monitoring and LDO voltage stabilizing circuit in this embodiment monitors the voltage across the capacitor, enables the LDO to output 3.3V when the capacitor voltage is higher than 3.8V, and disables the LDO when the voltage drops to 3.36V again; when the primary current is small and the capacitor charging speed is slow, the output voltage monitoring and LDO voltage stabilizing circuit is used for effectively preventing the circuit from being restarted frequently due to insufficient electric quantity.
In the embodiment, the cable sheath current value acquisition unit adopts a loop current acquisition circuit as shown in fig. 5, I/V conversion of measured CT output current is realized through a 1ohm sampling resistor, then a true effective value conversion chip AD736 is input, a linear proportional direct current voltage is output, and then an MCU (MSP 430F 2132) calculates the magnitude of the measured current according to the acquired direct current voltage by controlling the ADs1015 through an I2C interface, so as to realize current acquisition; and transmitting the information to the convergence unit through the transmission unit. In order to reduce the power consumption of the analog part, a load switch is adopted to control the power supply. The main power rail of the circulation acquisition circuit is 3.3V, and the analog part is provided with a-3.3V power rail by a negative charge pump.
In this embodiment, the vibration monitoring unit adopts an MPU-6050 triaxial acceleration plus a triaxial gyroscope sensor, and determines the motion condition of the cable in the three-dimensional direction according to the change conditions in the directions of the x, y, and z axes, so as to monitor the vibration condition of the cable. In the monitoring process, the change condition of the displacement is mainly determined accurately by combining an actual algorithm and a threshold value.
In the embodiment, the temperature monitoring unit adopts a PT100 temperature sensor, so that the temperature monitoring within the temperature range of-50-200 ℃ is realized, and the temperature monitoring accuracy of different regions is ensured. The method is mainly used for monitoring the temperature change condition at the joint of the cable body, and when the cable is in an abnormal condition, the temperature is taken as one of necessary reference conditions, because the method is particularly important for monitoring the temperature, but the method performs point marking on algorithm implementation because the influence of external factors is considered.
After the power supply is powered off, the system device can continue for a period of time by the power-off protection module, and the integrity of data collected at the moment of power-off is ensured.
The high-speed fault information acquisition terminal has a real-time clock with good accuracy and stability; the real-time clock runs synchronously, and various data at two ends of the line are ensured to be synchronously acquired at every moment.
Fault location module adopts D type range finding principle to carry out fault point range finding, and D type range finding principle is shown as figure 6 in this embodiment, and the process is as follows:
suppose that high-speed fault information acquisition terminals M, N are installed at two ends of a cable with the length L in FIG. 6, and M and N keep the heights consistent on the basis of time service of a GPS and a Beidou time service device, and synchronously acquire real-time data of the cable;
when the fault occurs at the position F in FIG. 6, M, N reads and records the time T of the fault initial traveling wave surge reaching M, N at high speedMAnd TN；
Assuming that the signals are transmitted to the M terminal and the N terminal at the same propagation velocity v, the following relationship exists:
wherein the lengths from the M-end bus and the N-end bus to the fault point are respectively DMF And DNF To represent; l is the length of the line MN. Simultaneous solution can solve DMFAnd DNF
Where v represents the speed of travel of the travelling wave in the cable.
In addition, it is also necessary to accumulate fault transient waveforms for storage and to perform corresponding processing.
The present invention is not limited to the precise arrangements described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The utility model provides a high tension cable running state monitoring devices, characterized by includes: the power supply system comprises a power taking module, a fault early warning module, an accuracy verification module, a power failure protection module and a fault positioning module;
the power taking module supplies power to the fault early warning module, the accuracy verification module, the power failure protection module and the fault positioning module;
the fault early warning module comprises: the device comprises a cable sheath current value acquisition unit, a vibration monitoring unit, a temperature monitoring unit and a data fusion early warning unit; the cable sheath current value acquisition unit, the vibration monitoring unit and the temperature monitoring unit are all used for monitoring data at a high-voltage cable joint and transmitting the data to the data fusion early warning unit for data fusion analysis to obtain a fault early warning result;
the accuracy verification module is used for studying and judging the multidimensional data, and performing cross verification on the multidimensional data to ensure the accuracy of fault early warning;
the fault positioning module comprises a high-speed fault information acquisition terminal, a GPS (global positioning system) and a Beidou time service device, wherein the high-speed fault signal acquisition terminal is arranged at two ends of the monitoring cable, and is used for quickly reading and recording the arrival time of the initial fault traveling wave surge when a fault occurs; the GPS and Beidou time service device provides an accurate time reference for the high-speed fault signal acquisition terminal.
2. The device for monitoring the operating condition of the high-voltage cable according to claim 1, wherein the electricity taking module comprises an electricity taking CT, a TVS protection, a rectifier bridge and energy leakage circuit, an energy leakage control, an energy storage circuit, an output voltage monitoring and LDO voltage stabilizing circuit; the electricity taking CT is in an open-close type, when the current reaches 3.5A, the electricity taking circuit is started to take electricity for the equipment, and therefore external power supply is not needed.
3. The apparatus for monitoring the operating condition of a high-voltage cable according to claim 2, wherein the rectifier bridge and the energy discharging circuit comprise: the half-controlled rectifier bridge circuit and the direct-current voltage amplitude limiting protection circuit realize rectification and direct-current voltage amplitude limiting protection; the direct-current voltage amplitude limiting protection circuit is composed of a voltage comparator and an RS trigger built by a discrete device, and hysteresis logic control is realized; the hysteresis logic control is that when the direct current voltage rises to 5V, the MOSFET is closed, so that the direct current voltage starts to fall, and after the direct current voltage falls to 4V, the MOSFET is disconnected, and the direct current voltage starts to fall; the hysteresis bandwidth from 5V to 4V is 1V, and the MOSFET switching frequency is reduced under the condition of large current.
4. The high voltage cable operating condition monitoring device of claim 3, wherein the hysteretic logic control drives the MOSFET output by a push-pull circuit.
5. The apparatus as claimed in claim 2, wherein the output voltage monitoring and LDO voltage stabilizing circuit monitors a voltage across the capacitor, enables the LDO output to be 3.3V when the capacitor voltage is higher than 3.8V, and disables the LDO output when the voltage drops to 3.36V, so as to effectively prevent the circuit from being restarted frequently due to insufficient power.
6. The high-voltage cable running state monitoring device as claimed in claim 1, wherein the cable sheath current value acquisition unit adopts a loop current acquisition circuit, and the measured CT output current is subjected to I/V conversion through a 1ohm sampling resistor, then input into a true effective value conversion chip, and output a linear proportion direct current voltage, and then the magnitude of the measured current is calculated according to the acquired direct current voltage, so as to realize the acquisition of the current; the main power rail of the circulation acquisition circuit is 3.3V, and the analog part is provided with a-3.3V power rail by a negative charge pump.
7. The device for monitoring the operating condition of the high-voltage cable according to claim 1, wherein the vibration monitoring unit adopts an MPU-6050 triaxial acceleration plus triaxial gyroscope sensor, and determines the motion condition of the cable in the three-dimensional direction according to the change condition of the directions of the axes x, y and z, so as to monitor the vibration condition of the cable.
8. The high-voltage cable running state monitoring device as claimed in claim 1, wherein the temperature monitoring unit adopts a PT100 temperature sensor to realize monitoring within a temperature range of-50 ℃ to 200 ℃ and ensure the monitoring accuracy of the temperature in different regions.
9. The high-voltage cable running state monitoring device as claimed in claim 1, wherein the high-speed fault information acquisition terminal has a real-time clock with good accuracy and stability; the real-time clock runs synchronously, and various data at two ends of the line are ensured to be synchronously acquired at every moment.
10. The high-voltage cable operation state monitoring device as claimed in claim 1, wherein the fault location module performs fault point location by using a D-type location principle.
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| CN202021857262.7U CN212872735U (en) | 2020-08-31 | 2020-08-31 | High-voltage cable running state monitoring device |
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| CN202021857262.7U CN212872735U (en) | 2020-08-31 | 2020-08-31 | High-voltage cable running state monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115060326A (en) * | 2022-07-12 | 2022-09-16 | 四川鑫电电缆有限公司 | Cable monitoring method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115060326A (en) * | 2022-07-12 | 2022-09-16 | 四川鑫电电缆有限公司 | Cable monitoring method and system |
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