CN115540946A - Cable state monitoring system and method - Google Patents
Cable state monitoring system and method Download PDFInfo
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Abstract
The invention discloses a cable state monitoring system and a method. The system comprises a sensor, a monitoring module, a cloud server, a user terminal and a remote server, wherein the output end of the sensor is connected with the input end of the monitoring module, the monitoring module is connected with the cloud server through a wireless network, and the cloud server is connected with the remote server through the wireless network; the sensor is used for acquiring the induced voltage of the cable line and sending the induced voltage to the monitoring module; the monitoring module is used for judging the state information of the cable line according to the induction voltage, generating an alarm signal when the cable line is abnormal, and sending the alarm signal to the cloud server; the cloud server is used for pushing the alarm signal to the user terminal and the remote server. This system is based on sensor real-time supervision induced voltage's size, and the staff need not live-line operation, has greatly ensured staff's security and reliability, realizes remote monitoring through wireless high in the clouds server, has greatly made things convenient for a ray of fortune dimension maintenance work.
Description
Technical Field
The invention relates to the technical field of cable state detection, in particular to a cable state monitoring system and a cable state monitoring method.
Background
The power cable is laid underground, the operation environment is relatively severe, cable faults occur occasionally, sudden power failure and fire hidden dangers are easily caused, cable lines can be stolen and other artificial damage accidents can also occur, and the cable lines can cause great economic loss for enterprises. No matter the power supply enterprise or the power utilization enterprise, a large amount of manpower and material resources are invested to maintain and manage the cable every year. The existing power distribution switch monitoring terminal (FTU for short) can provide the running condition of a power distribution system, various parameters and information required by monitoring control, communicate with a power distribution automation master station, execute a command issued by the power distribution master station, and adjust and control power distribution equipment.
However, the existing FTU can only be installed on 10kV and 33kV distribution overhead lines, and cannot provide state information of the distribution network cable lines; and the internal network of the power system is used, the electronic map is slowly updated, the current running state of the power distribution network cannot be displayed in real time, when a line breaks down, the fault type and the fault point cannot be known at the first time, and the workload of operation and maintenance personnel is huge. The main reasons for the above problems are: (1) The current FTU adopts the traditional mutual inductor to collect voltage and current information, and cannot monitor the current of each phase of the three-core cable; (2) The current FTU does not have the communication function of the Internet of things, and can not update the line running state information measured by equipment in an electronic map in real time; (3) The existing FTU has complex structure and high manufacturing cost, and cannot be installed in a large-scale distributed manner.
Disclosure of Invention
The embodiment of the invention provides a cable state monitoring system and a cable state monitoring method, and aims to solve the problem that the cable state is difficult to accurately monitor in the prior art.
In a first aspect, an embodiment of the present invention provides a cable state monitoring system, including a sensor, a monitoring module, a cloud server, a user terminal, and a remote server, where an output end of the sensor is connected to an input end of the monitoring module, the monitoring module is connected to the cloud server through a wireless network, and the cloud server is connected to the remote server through a wireless network;
the sensor is used for acquiring the induced voltage of the cable line and sending the induced voltage to the monitoring module;
the monitoring module is used for judging the state information of the cable line according to the induction voltage, generating an alarm signal when the cable line is abnormal, and sending the alarm signal to the cloud server, wherein the state information at least comprises the state quantity of each phase current of the cable, the unbalance degree of the three-phase voltage, the temperature of the cable duct and the humidity of the cable duct;
the cloud server is used for pushing the alarm signal to the user terminal and the remote server.
In a second aspect, an embodiment of the present invention provides a cable condition monitoring method, including:
the method comprises the following steps that a sensor monitors the induced voltage of a power distribution network cable line and sends the induced voltage to a monitoring module;
the monitoring module carries out conversion processing on the induction voltage to obtain a three-phase voltage, calculates the voltage unbalance degree based on the three-phase voltage to obtain the voltage unbalance degree of the power distribution network cable line, judges whether the cable line is abnormal or not based on the voltage unbalance degree, and generates an alarm signal and sends the alarm signal to a cloud server if the cable line is abnormal;
and the cloud server transmits the alarm signal to the remote server and the user terminal.
The embodiment of the invention provides a cable state monitoring system and a method. The system comprises a sensor, a monitoring module, a cloud server, a user terminal and a remote server, wherein the output end of the sensor is connected with the input end of the monitoring module, the monitoring module is connected with the cloud server through a wireless network, and the cloud server is connected with the remote server through the wireless network; the sensor is used for acquiring the induced voltage of the cable line and sending the induced voltage to the monitoring module; the monitoring module is used for judging state information of the cable line according to the induction voltage, generating an alarm signal when the cable line is abnormal, and sending the alarm signal to the cloud server, wherein the state information at least comprises state quantity of each phase of current of the cable, unbalanced degree of three-phase voltage, temperature of a cable duct and humidity of the cable duct; the cloud server is used for pushing the alarm signal to the user terminal and the remote server. This system is based on the electromagnetic induction principle, through the size of sensing voltage in the sensor real-time supervision cable, the staff need not live-line operation, has greatly ensured the security and the reliability of staff's operation, and the monitoring module can be arranged fast, realizes remote monitoring through wireless high in the clouds server, has greatly made things convenient for a ray of fortune maintenance work.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a system block diagram of a cable status monitoring system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a cable status monitoring method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a sensor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a monitoring module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing the comparison of the three-phase unbalance in each state of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Fig. 1 is a system block diagram of a cable status monitoring system according to an embodiment of the present invention.
Fig. 1 shows a cable status monitoring system, which includes a sensor 1, a monitoring module 2, a cloud server 3, a user terminal 4, and a remote server 5; the output end of the sensor 1 is connected with the input end of the monitoring module 2, the monitoring module 2 is connected with the cloud server 3 through a wireless network, and the cloud server 3 is connected with the remote server 5 through a wireless network 4;
the sensor 1 is used for acquiring the induced voltage of a 10KV power distribution network cable line and sending the induced voltage to the monitoring module 2;
the monitoring module 2 is used for judging the state information of the cable line according to the induced voltage, generating an alarm signal when the cable line is abnormal, and sending the alarm signal to the cloud server 3, wherein the state information at least comprises the state quantity of each phase of current of the cable, the unbalance degree of three-phase voltage, the temperature of a cable duct and the humidity of the cable duct;
the cloud server 3 is used for pushing the alarm signal to the user terminal 4 and the remote server 5.
In the embodiment, the sensor 1 is used for monitoring the induced voltage of the power distribution network cable line, then the induced voltage is sent to the monitoring module 2, the monitoring module 2 is used for calculating the voltage unbalance of the power distribution network cable line according to the induced voltage, judging whether the cable line is abnormal or not according to the voltage unbalance, and generating an alarm signal when the cable line is abnormal and sending the alarm signal to the cloud server 3; the cloud server pushes the alarm signal to the user terminal 4 and the remote server 5, and remote monitoring of the cable state is achieved.
In one embodiment, the sensor consists of three side-by-side racetrack-type coils. As shown in fig. 3, three coils are arranged in parallel on the insulating cloth with a pitch of one third of the outer circumference of the cable and a difference of the width of the coils. The sensor is coated on the cable in a sphygmomanometer type mounting mode, and the difference of the spatial positions of the three coils after the cable is coated is 120 degrees. If the cable normally runs, three-phase current of a cable line generates a circular rotating magnetic field, three-phase induced potential amplitudes generated by the sensor are equal, the induced potential is in direct proportion to the cable current, and the current of each phase in the three-core cable can be judged according to the induced potential. If the cable has unbalance, open-phase and open-circuit faults, an oval magnetic field is generated, and the three-phase induced potential amplitudes generated by the sensor are not equal any more, so that whether the cable line has faults or not can be judged according to the magnitude of the voltage unbalance.
As shown in fig. 4, in one embodiment, the monitoring module includes a conditioning circuit 8, a DSP processor 9, a power management module 11, and an alarm module 10. The input end of the conditioning circuit 8 is connected with the output end of the sensor, the output end of the conditioning circuit is connected with the input end of the DSP processor 9, the output end of the DSP processor 9 is connected with the input end of the alarm module 10, and the output end of the power management module 11 is respectively connected with the DSP processor 9, the conditioning circuit 8 and the alarm module 10. Specifically, the conditioning circuit 8 is configured to amplify the induced voltage output by the sensor and convert the amplified induced voltage into a positive voltage that satisfies the DSP input range; the DSP 9 is used for acquiring and calculating voltage data output by the conditioning circuit 8, calculating the voltage unbalance of the cable according to the voltage data, performing analog-to-digital conversion according to the voltage unbalance, and sending an alarm signal to the alarm module 10 if the voltage unbalance is lower than a preset threshold; the power management module 11 is used for supplying power to the DSP processor 9, the conditioning circuit 8 and the alarm module 10; the alarm module 10 is used for receiving the alarm signal sent by the DSP processor 9 and giving an alarm.
In an embodiment, an a/D conversion module in the DSP processor converts an analog quantity into a digital quantity, selects 80 points/cycle specified by IEC61850 standard as a sampling rate, samples 10 cycles, and can obtain 800 point voltage data, where a calculation formula of an effective value of each phase voltage is as follows:
wherein N represents a sampling point of 800,u n Representing the discrete voltage value of the nth sample point.
The imbalance degree refers to the degree of three-phase imbalance in the power system, and a unified and definite standard does not exist for the calculation formula of the three-phase imbalance degree at present, and a plurality of different calculation versions exist. The method for calculating the unbalance degree in the invention adopts a voltage unbalance degree calculation method defined by IEEEstd936-1987, and is equal to the ratio of the difference between the effective value of the maximum voltage and the effective value of the minimum voltage in three phases to the average phase voltage of the three phases, and the specific formula is as follows:
in the formula of U ave The average value of the three-phase voltage effective values is represented; in the formula of U max A maximum phase voltage representing an effective value of the three-phase voltage; u shape min And the minimum phase voltage represents the effective value of the three-phase voltage.
In this embodiment, when the monitoring module is installed, the staff registers the geographical position information of the corresponding monitoring module, and the cloud server can visually display the running state of the 10kV cable in the region in real time by combining with the geographical information system. Simultaneously, when the staff passes through remote server access high in the clouds server, can directly perceivedly see the electrified state and three phase current of 10kV cable conductor in the region, the size of three-phase unbalance degree, after the high in the clouds server acquires the alarm signal of monitoring module, also can show the geographical position information of the corresponding monitoring module that goes wrong, make things convenient for the staff to investigate.
In one embodiment, the conditioning circuit comprises an isolation amplifier, a differential operational amplifier and a voltage follower, wherein the input end of the isolation amplifier is respectively connected with two output terminals of each phase coil in the sensor, and the output end of the isolation amplifier is connected with the input end of the differential operational amplifier; the output end of the differential operational amplifier is connected with the input end of the voltage follower, and the output end of the voltage follower is connected with the input end of the DSP processor. The isolation operational amplifier is used for receiving the induction voltage output by the sensor and sending the induction voltage to the differential operational amplifier; the differential operational amplifier is used for receiving the induction voltage output by the isolation operational amplifier, amplifying the induction voltage and then sending the amplified induction voltage to the voltage follower; the voltage follower is used for detecting the induced voltage output by the differential operational amplifier, if the induced voltage is negative voltage, the negative voltage is converted into positive voltage, and the converted positive voltage is sent to the DSP.
In an embodiment, the DSP processor further includes an analog-to-digital conversion module and a communication module, the analog-to-digital conversion module is configured to obtain a value of the induced voltage, the communication module is an NB-I/OT module, the NB-I/OT module is connected to a serial port communication port of the DSP processor through a serial port, and the DSP processor receives a command sent from the cloud server through the NB-I/OT module and sends state monitoring information of the cable line to the cloud server through the NB-I/OT module. The DSP processor is connected with the communication module through a serial port. The DSP processor has the characteristics of low power consumption, high performance, easy programming, real-time performance and the like, and has natural advantages in the aspect of signal processing. The DSP acquires and calculates data acquired after the processing of the conditioning circuit to obtain three-phase unbalance data, and transmits the data to the remote server, and the analog-to-digital conversion module mainly plays a role in signal sampling and processing to ensure the real-time performance of data transmission.
In one embodiment, the alarm module comprises an alarm lamp and an alarm horn, and the alarm lamp and the alarm horn are both connected with the DSP processor through I/O pins.
In the embodiment, the alarm module has a light sound alarm function, and is in a dormant state when a power distribution network cable line normally runs; when faults such as phase loss, short circuit, open circuit and the like occur in a power distribution network cable line, the alarm module receives an alarm signal and sends out a flash alarm signal and an alarm sound for reminding.
In one embodiment, the power management module includes a power supply battery, a power conversion circuit and a power conversion IC, the power supply battery is connected to the power conversion circuit, the power conversion circuit is connected to the power conversion IC, and an output terminal of the power conversion IC is connected to an input terminal of the DSP processor. The power conversion IC comprises a battery and a battery power detection circuit.
In this embodiment, the power management module supplies power to the monitoring module, and four 3.7V power supply batteries are connected in series to output 15V voltage. The power conversion circuit converts a 15V power supply into a 5V power supply, and the power conversion IC converts the 5V power supply into a 3.3V stabilized power supply by adopting a TTL (transistor-transistor logic) conversion 232 module to supply power to the detection circuit and the DSP (digital signal processor).
Referring to fig. 2, fig. 2 is a schematic flow chart of a cable condition monitoring method according to an embodiment of the present invention;
the embodiment of the invention also provides a cable state monitoring method, which is applied to the cable state monitoring system and comprises the following steps:
step S110, a sensor monitors the induced voltage of a power distribution network cable line and sends the induced voltage to a monitoring module;
step S120, the monitoring module carries out conversion processing on the induction voltage to obtain three-phase voltage, calculates the voltage unbalance degree based on the three-phase voltage to obtain the voltage unbalance degree of the power distribution network cable line, judges whether the cable line is abnormal or not based on the voltage unbalance degree, and generates an alarm signal and sends the alarm signal to a cloud server if the cable line is abnormal;
step S130, the cloud server transmits the alarm signal to the remote server and the user terminal.
The embodiment introduces the state monitoring of the power distribution network cable line, the induced voltage of the power distribution network cable line is monitored through a sensor, the monitoring module calculates the three-phase voltage according to the induced voltage, the voltage unbalance of the cable is calculated based on the three-phase voltage, finally, whether the cable line is abnormal or not is judged according to the voltage unbalance, and if the cable line is abnormal, an alarm signal is generated and sent to a cloud server; and the cloud server transmits the alarm signal to the remote server and the user terminal, so that the remote monitoring of the cable state is realized. Specifically, the process of determining whether the cable line is abnormal according to the voltage unbalance degree includes: judging whether the voltage unbalance degree reaches a preset threshold value, if so, judging that the cable line is abnormal; if not, the cable line is judged to be normal.
In this embodiment, a test environment is established, and the test environment comprises a three-phase 380V power supply, a three-phase air switch, a 10KVA three-phase voltage regulator, a 300X 3 cable, 15 ohm/1000W load resistors (three, star connection), a plurality of resistors for simulating short circuit and voltage unbalance, a sensor, a detection device, an oscilloscope and a computer. The cable is wrapped with a sensor which is composed of a, b and c three-phase coils. The normal operation of the system is characterized in that the unbalance degree of the induced potential can meet less than 5 percent and the phase difference is about 120 degrees. Compared with the three-phase balance condition, one of the characteristics of the unbalanced operation of the system is that the voltage asymmetry degree is increased, and whether the system is in the unbalanced operation at the moment can be judged according to the calculation result of the voltage asymmetry degree in the DSP program. When the cable has an open circuit fault, the voltage unbalance reaches about 60 percent, and the same phase condition exists in the phase. If the position distribution of three conducting wires in the cable is known, a sensor is arranged at the corresponding position above the known cable, and the specific open-circuit phase can be judged at the moment. The phase A is open, and the coil induced potential corresponding to the phase A is the minimum of three-phase induced potentials; when the phase B is open, the induction potential of the coil corresponding to the phase B is minimum; and when the phase C is open, the induction potential corresponding to the phase C is minimum. On the premise that the system is judged to be open-circuit, which phase ABC has the open-circuit fault can be judged according to the judgment result. If the three-phase voltage unbalance is much less than 60% but more than 10% and the three-phase difference is about 120 degrees, the cable is unbalanced in three phases. FIG. 5 is a schematic diagram showing the comparison of the three-phase unbalance in the states of the present invention.
Furthermore, in order to ensure that the induced potential monitored by the sensor is large enough to be detected by subsequent equipment, the invention provides a method for designing sensor parameters. The sensors have four parameters to be determined, namely wire diameter phi, coil turn number n, coil width w and coil length l. To ensure a high sensitivity of the sensor, the induced current detected by the sensor should be as large as possible. The size of the induced potential generated by the coil is proportional to the length and the number of turns of the coil. Noting that a single-turn coil with unit length generates an induced potential u, the resistance of a lead with unit length is r, and the inductive reactance of the coil with unit length is x, the expression of the induced current is as follows:
the longer the coil length is, the larger the induced current is, the larger the induced potential is, and the higher the detection sensitivity is, the easier the detection is. But the corresponding cost and the processing difficulty are also increased correspondingly, and the length of the coil needs to be selected in cooperation with other variables. The wire diameter phi influences the resistance of the coil, and the larger the wire diameter is, the larger the sectional area of the lead is, the smaller the resistance is, and the larger the induced current is. The three-phase induction coils cannot be electrically contacted, and therefore, the size of the coil wire diameter affects the maximum number of turns that can be used. When the difference between two sides of the coil is 180 degrees, the directions of the electric potentials generated by the two sides are opposite, the detected induction potential is the largest, but the corresponding resistance of the coil is also increased, the maximum number of turns of the coil is reduced, and the optimal width w of the coil needs to be found to meet the requirement that the mutual inductance between three-phase coils is small enough and the induction current of the coil is the largest. According to the expression, the selection of the number n of the coil turns needs to be determined according to the coil inductive reactance calculated by simulation. Three variables of the coil wire diameter, the width and the turn number are mutually influenced, a control variable method is needed, COMSOL simulation software is used for calculating and determining the optimal coil parameters which enable the induced current to be large and the sensitivity to be high and meet the induced potential detection requirements, and in addition, the selection of the coil parameters needs to be adjusted according to processing factors.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses, devices and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. Those of ordinary skill in the art will appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus, device and method can be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only a logical division, and there may be other divisions when the actual implementation is performed, or units having the same function may be grouped into one unit, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electrical, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a magnetic disk, or an optical disk.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A cable state monitoring system is characterized by comprising a sensor, a monitoring module, a cloud server, a user terminal and a remote server, wherein the output end of the sensor is connected with the input end of the monitoring module, the monitoring module is connected with the cloud server through a wireless network, and the cloud server is connected with the remote server through the wireless network;
the sensor is used for acquiring the induced voltage of the cable line and sending the induced voltage to the monitoring module;
the monitoring module is used for judging the state information of the cable line according to the induction voltage, generating an alarm signal when the cable line is abnormal, and sending the alarm signal to the cloud server, wherein the state information at least comprises the state quantity of each phase current of the cable, the unbalance degree of the three-phase voltage, the temperature of the cable duct and the humidity of the cable duct;
and the cloud server is used for pushing the alarm signal to the user terminal and the remote server.
2. The cable condition monitoring system of claim 1, wherein the sensor includes three racetrack coils arranged side-by-side.
3. The cable condition monitoring system according to claim 2, wherein the monitoring module comprises a DSP processor, a conditioning circuit, a power management module, and an alarm module, an input of the conditioning circuit is connected to the output of the sensor, an output of the conditioning circuit is connected to an input of the DSP processor, an output of the DSP processor is connected to an input of the alarm module, and an output of the power management module is connected to the DSP processor, the conditioning circuit, and the alarm module, respectively; wherein:
the conditioning circuit is used for amplifying the induced voltage output by the sensor and converting the induced voltage into positive voltage meeting the DSP input range;
the DSP is used for collecting and calculating voltage data output by the conditioning circuit, calculating the voltage unbalance degree of the cable according to the voltage data, and sending an alarm signal to the alarm module according to the voltage unbalance degree;
the power supply management module is used for supplying power to the DSP processor, the conditioning circuit and the alarm module;
and the alarm module is used for receiving the alarm signal sent by the DSP processor and giving an alarm.
4. The cable condition monitoring system of claim 3, wherein the conditioning circuit comprises an isolation amplifier, a differential operational amplifier and a voltage follower, wherein the input terminals of the isolation amplifier are respectively connected with the two output terminals of each phase coil in the sensor, and the output terminal of the isolation amplifier is connected with the input terminal of the differential operational amplifier; the output end of the differential operational amplifier is connected with the input end of the voltage follower, and the output end of the voltage follower is connected with the input end of the DSP processor; wherein the content of the first and second substances,
the isolation operational amplifier is used for receiving the induction voltage output by the sensor and sending the induction voltage to the differential operational amplifier;
the differential operational amplifier is used for receiving the induction voltage output by the isolation operational amplifier, amplifying the induction voltage and then sending the amplified induction voltage to the voltage follower;
the voltage follower is used for detecting the induced voltage output by the differential operational amplifier, if the induced voltage is negative voltage, the negative voltage is converted into positive voltage, and the converted positive voltage is sent to the DSP.
5. The cable condition monitoring system of claim 4, wherein the DSP processor includes an analog-to-digital conversion module for obtaining a value of the induced voltage.
6. The cable condition monitoring system of claim 5, wherein the DSP processor further comprises a communication module that is an NB-I/OT module.
7. The cable condition monitoring system of claim 6, wherein the alarm module comprises an alarm lamp and an alarm horn, both of which are connected to the DSP processor via an I/O pin.
8. The cable status monitoring system of claim 7, wherein the power management module comprises a power supply battery, a power conversion circuit, and a power conversion IC, wherein the power supply battery is connected to the power conversion circuit, the power conversion circuit is connected to the power conversion IC, and an output of the power conversion IC is connected to an input of the DSP processor.
9. A cable condition monitoring method of a cable condition monitoring system according to any one of claims 1 to 8, comprising:
the method comprises the following steps that a sensor monitors the induced voltage of a power distribution network cable line and sends the induced voltage to a monitoring module;
the monitoring module carries out conversion processing on the induction voltage to obtain three-phase voltage, calculates the voltage unbalance degree based on the three-phase voltage to obtain the voltage unbalance degree of the power distribution network cable line, judges whether the cable line is abnormal or not based on the voltage unbalance degree, and generates an alarm signal and sends the alarm signal to a cloud server if the cable line is abnormal;
and the cloud server transmits the alarm signal to the remote server and the user terminal.
10. The method for monitoring the condition of the cable according to claim 9, wherein the determining whether the cable line is abnormal based on the voltage imbalance degree comprises:
judging whether the voltage unbalance reaches a preset threshold value or not;
if yes, judging that the cable line is abnormal;
if not, the cable line is judged to be normal.
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| CN202211281597.2A CN115540946A (en) | 2022-10-19 | 2022-10-19 | Cable state monitoring system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380169A (en) * | 2023-04-15 | 2023-07-04 | 无锡广盈集团有限公司 | Identification monitoring method and system for intelligent cable installation |
| CN116500499A (en) * | 2023-06-26 | 2023-07-28 | 陕西雨唐连创科技有限公司 | Three-core cable fault detection device, system and method |
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2022
- 2022-10-19 CN CN202211281597.2A patent/CN115540946A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380169A (en) * | 2023-04-15 | 2023-07-04 | 无锡广盈集团有限公司 | Identification monitoring method and system for intelligent cable installation |
| CN116380169B (en) * | 2023-04-15 | 2024-04-26 | 无锡广盈集团有限公司 | Identification monitoring method and system for intelligent cable installation |
| CN116500499A (en) * | 2023-06-26 | 2023-07-28 | 陕西雨唐连创科技有限公司 | Three-core cable fault detection device, system and method |
| CN116500499B (en) * | 2023-06-26 | 2023-09-15 | 陕西雨唐连创科技有限公司 | Three-core cable fault detection device, system and method |
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