CN112114228A - Power distribution network fault detection device and system - Google Patents
Power distribution network fault detection device and system Download PDFInfo
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- CN112114228A CN112114228A CN202010876108.2A CN202010876108A CN112114228A CN 112114228 A CN112114228 A CN 112114228A CN 202010876108 A CN202010876108 A CN 202010876108A CN 112114228 A CN112114228 A CN 112114228A
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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 invention relates to a power distribution network fault detection device and system, which are used for carrying out fault detection on a line to be detected of a power distribution network. The power distribution network fault detection device comprises a detection assembly, a controller, a switch device and a wireless communicator. The detection assembly is used for detecting circuit parameters of a circuit to be detected, and the wireless communicator can convert the circuit parameters into wireless communication signals for transmission so as to facilitate remote monitoring of the circuit parameters. When the circuit parameter exceeds the preset threshold value, the controller can control the switching device to be switched off, so that the line to be tested is powered off, and the power supply safety of the power distribution network is ensured. The power distribution network fault detection device can remotely monitor the circuit parameters of the line to be detected, so as to judge whether the line to be detected has a fault or not. The fault position of the power distribution network can be obtained by carrying out fault detection on the line to be detected of the power distribution network, so that inconvenience caused by manual detection of the fault position of the power distribution network is avoided.
Description
Technical Field
The invention relates to the technical field of power detection, in particular to a power distribution network fault detection device and system.
Background
A power distribution network is a power supply system that can directly distribute power to users. Whether the power supply capacity and the power supply quality are reliable or not has great influence on users.
In the conventional technology, whether a power distribution network fails or not and the failure position are usually detected manually.
The inventor finds out in the process of realizing the conventional technology that: manually detecting the fault location of the power distribution network requires a large amount of manpower, material resources, and time.
Disclosure of Invention
Therefore, it is necessary to provide a power distribution network fault detection device and system for solving the problem that a large amount of manpower, material resources and time are required to be consumed for manually detecting the fault position of the power distribution network in the conventional technology.
A power distribution network fault detection device for carrying out fault detection on a power distribution network, the power distribution network is provided with a line to be detected, and the power distribution network fault detection device comprises:
the detection assembly is electrically connected with the line to be detected so as to obtain circuit parameters of the line to be detected, and the circuit parameters comprise current signals, leakage current signals, temperature signals and local discharge signals of the line to be detected;
the controller is electrically connected with the detection assembly to acquire the circuit parameters and generate a control instruction according to the circuit parameters;
the switching device is electrically connected with the circuit to be tested and is also electrically connected with the controller so as to control the on-off of the circuit to be tested according to the control instruction;
and the wireless communicator is electrically connected with the controller and is used for acquiring the circuit parameters and converting the circuit parameters into wireless communication signals for transmission.
In one embodiment, the detection component includes a current transformer electrically connected to the line to be tested to obtain the current signal of the line to be tested;
the current transformer is also electrically connected with the controller, so that the controller acquires the current signal of the line to be tested.
In one embodiment, the detection component includes a leakage current sensor electrically connected to the line to be tested to obtain the leakage current signal of the line to be tested;
the leakage current sensor is also electrically connected with the controller, so that the controller acquires the leakage current signal of the line to be detected.
In one embodiment, the detection component includes a temperature sensor, and the temperature sensor is attached to the line to be detected to obtain the temperature signal of the line to be detected;
the temperature sensor is also electrically connected with the controller, so that the controller acquires the temperature signal of the line to be detected.
In one embodiment, the detection component includes a partial discharge tester electrically connected to the line under test to obtain the partial discharge signal of the line under test;
the partial discharge tester is also electrically connected with the controller so that the controller acquires the partial discharge signal of the line to be tested.
In one embodiment, the power distribution network fault detection apparatus further includes:
the signal shielding device is electrically connected with the controller so as to control the signal shielding device to work when the controller works, and the detection assembly is located in the shielding range of the signal shielding device.
In one embodiment, the wireless communicator comprises at least one of a bluetooth communicator and a cellular communicator.
In one embodiment, the controller comprises a signal processing circuit, the signal processing circuit comprises a filter circuit, an amplifying circuit, an analog-to-digital conversion circuit and a comparison circuit, and the filter circuit, the amplifying circuit, the analog-to-digital conversion circuit and the comparison circuit are electrically connected in sequence along the transmission direction of an electric signal.
In one embodiment, the power distribution network fault detection apparatus further includes:
and the alarm is electrically connected with the controller so as to obtain the control instruction and work according to the control instruction.
A power distribution network fault detection system comprises the power distribution network fault detection device in any one of the above embodiments.
The power distribution network fault detection device can detect the fault of the line to be detected of the power distribution network. The power distribution network fault detection device comprises a detection assembly, a controller, a switch device and a wireless communicator. The detection assembly is used for detecting circuit parameters of a circuit to be detected, and the wireless communicator can convert the circuit parameters into wireless communication signals for transmission, so that the remote monitoring of the circuit parameters is facilitated. When the circuit parameter exceeds the preset threshold value, the controller can control the switching device to be switched off, so that the line to be tested is powered off, and the power supply safety of the power distribution network is ensured. The power distribution network fault detection device can remotely monitor the circuit parameters of the line to be detected, so as to judge whether the line to be detected has a fault or not. The fault position of the power distribution network can be obtained by carrying out fault detection on the line to be detected of the power distribution network, so that inconvenience caused by manual detection of the fault position of the power distribution network is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power distribution network fault detection apparatus according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power distribution network fault detection apparatus according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a power distribution network fault detection apparatus according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a power distribution network fault detection system in an embodiment of the present application.
Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:
10. a power distribution network; 12. a trunk road; 14. a branch circuit; 20. a power distribution network fault detection device; 210. a detection component; 212. a current transformer; 214. a leakage current sensor; 216. a temperature sensor; 218. a partial discharge tester; 220. a controller; 221. a signal processing circuit; 222. a filter circuit; 224. an amplifying circuit; 226. an analog-to-digital conversion circuit; 228. a comparison circuit; 229. a single chip microcomputer; 230. a switching device; 240. a wireless communicator; 250. a signal shield; 260. an alarm; 30. a power distribution network fault detection system; 32. and monitoring the terminal.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
A power distribution network is a power supply system that can directly distribute power to users. As shown in fig. 1, a power distribution network may include a trunk and a plurality of branches electrically connected to the trunk. The application provides a power distribution network's fault detection device can detect whether the trouble of power distribution network, and the position that the trouble of power distribution network took place.
In the embodiments of the present application, the electrical connection between two devices means that the two devices are connected by a wire or wirelessly so that the electrical signal can be transmitted between the two devices. The communication connection between the two devices means that the two devices are connected by wire or wireless connection, so that the communication signal is transmitted.
In one embodiment, as shown in fig. 1, the present application provides a power distribution network fault detection apparatus 20, configured to perform fault detection on a line to be detected of a power distribution network 10, so as to determine whether the line to be detected has a fault. The lines under test may be any trunk 12 and branch 14 of the power distribution network 10. The power distribution network fault detection apparatus 20 includes a detection component 210, a controller 220, a switching device 230, and a wireless communicator 240.
Specifically, the detecting component 210 may be electrically connected to the line to be detected, so as to detect the line to be detected, so as to obtain the circuit parameter of the line to be detected. In an embodiment of the present application, the circuit parameter of the line under test includes at least one of magnitudes of a current signal, a leakage current signal, a temperature signal, and a local discharge signal of the line under test. The magnitude of the current signal of the line to be tested refers to the magnitude of the current in the line to be tested. The magnitude of the leakage current signal of the line to be tested refers to the magnitude of the leakage current in the line to be tested. The size of the temperature signal of the line to be measured refers to the temperature value of the line to be measured. The magnitude of the partial discharge signal of the line to be tested refers to the magnitude of the current of the partial discharge in the line to be tested.
The controller 220 may be electrically connected to the detection assembly 210 to obtain the circuit parameters and generate the control instructions according to the circuit parameters. In other words, after the detecting component 210 obtains the circuit parameter of the line under test, the circuit parameter of the line under test can be transmitted to the controller 220. The controller 220 may be preset with a preset program and a preset threshold, so that after the circuit parameter of the line to be tested is obtained, the preset program is run to compare the circuit parameter of the line to be tested with the preset threshold. In an embodiment of the present application, the circuit parameter may include at least one of magnitudes of a current signal, a leakage current signal, a temperature signal, and a local discharge signal of the line under test. Therefore, the preset threshold may also be set to a current threshold, a leakage current threshold, a temperature threshold, and a partial discharge threshold, respectively, for the circuit parameter. After the controller 220 compares the circuit parameter with the preset threshold, a control command may be generated according to the comparison result.
The switching device 230 is electrically connected to the line to be tested, so as to control the on/off of the circuit of the line to be tested. When the switching device 230 is closed, the line under test is conductive and can distribute power to the user. When the switching device 230 is turned off, the line to be tested cannot be conducted, and power distribution cannot be achieved. The switching device 230 is also electrically connected to the controller 220, thereby acquiring a control command generated by the controller 220 and operating according to the control command. In other words, the controller 220 may control the switching device 230 to be turned on or off through a control command, so as to control whether the line to be tested is on or off. In an embodiment of the present application, the switching device 230 may be a three terminal device, such as an IGBT (Insulated Gate Bipolar Transistor). The switching device 230 may have a first terminal for controlling conduction between the second terminal and the third terminal, a second terminal, and a third terminal. Thus, the second terminal and the third terminal of the switching device 230 may be electrically connected to the line to be tested. The first terminal of the switching device 230 may be electrically connected to the controller 220, so that whether the second terminal and the third terminal are conducted or not is controlled after the control command is transmitted to the first terminal of the switching device 230.
The wireless communicator 240 is electrically connected to the controller 220, and is configured to obtain the circuit parameters, convert the circuit parameters into wireless communication signals, and transmit the wireless communication signals. In other words, the wireless communicator 240 is configured to convert the wired signal into a wireless signal and transmit the wireless signal. After the controller 220 obtains the circuit parameters of the line under test, the circuit parameters may be transmitted to the wireless communicator 240. The wireless communicator 240 may convert the circuit parameters into wireless communication signals for transmission. Therefore, after other terminals with wireless communication functions acquire the wireless communication signal, the circuit parameters of the line to be tested can be obtained.
More specifically, when the power distribution network fault detection device 20 of the present application operates, the detection component 210 may detect a circuit parameter of a line to be detected. After the detection component 210 obtains the circuit parameter, the circuit parameter can be transmitted to the controller 220. A preset program and a preset threshold value can be preset in the control, so that after the circuit parameters of the circuit to be tested are obtained, the preset program is operated, the circuit parameters of the circuit to be tested are compared with the preset threshold value, and a control instruction is obtained according to the comparison result. The controller 220 controls the switching device 230 to be turned on or off according to the control command, so as to control whether the line to be tested is on or off. Meanwhile, the controller 220 may also transmit the circuit parameter to the wireless communicator 240, so as to transmit the circuit parameter in a wireless communication manner, thereby facilitating remote monitoring of the circuit parameter. The power distribution network fault detection device 20 can remotely monitor circuit parameters of a line to be detected, so as to judge whether the line to be detected has a fault or not. The power distribution network 10 line detection device can remotely monitor circuit parameters, so that whether each circuit parameter is normal or not is judged, and when faults such as short circuit, leakage current, high temperature and partial discharge occur in the power distribution network 10, the controller 220 controls the switch device 230 to cut off a line to be detected. The fault position of the power distribution network 10 can be obtained by performing fault detection on the line to be detected of the power distribution network 10, so that inconvenience caused by manual detection of the fault position of the power distribution network 10 is avoided, and the safety of the circuit in the power distribution network 10 is improved.
It should be noted that, in the above embodiments, for convenience of description, the power distribution network 10 is introduced to explain the power distribution network fault detection apparatus 20 of the present application. However, in practical applications, the power distribution network fault detection apparatus 20 of the present application is used for fault detection of the power distribution network 10, and does not include the power distribution network 10. That is, the power distribution network 10 is an environmental element of the power distribution network fault detection device 20 of the present application, and the introduction or non-introduction thereof should not be understood as a limitation to the protection scope of the power distribution network fault detection device 20 of the present application.
It should be noted that the power distribution network fault detection device 20 of the present application may be preset in a line to be tested of the power distribution network 10, so as to determine a fault location when a circuit parameter in the line to be tested is abnormal, and improve the safety of the line in the power distribution network 10.
In one embodiment, each branch 14 and trunk 12 of power distribution network 10 may be a line to be tested, and power distribution network 10 to be fault detected may have several lines to be tested. The power distribution network fault detection apparatus 20 of the present application may include a plurality of detection components 210 and a plurality of switching devices 230. The controller 220 may also have a plurality of preset thresholds and a plurality of preset programs corresponding to a plurality of lines to be tested. Each of the detecting elements 210 may be electrically connected to a line to be tested, so as to obtain circuit parameters of the line to be tested. Each switching device 230 may be electrically connected to a line under test, so as to control the on/off of the line under test. When the power distribution network fault detection device 20 works, the controller 220 may generate a control instruction according to the circuit parameter of each line to be tested, so as to control whether the line to be tested is conducted or not.
In one embodiment, the power distribution network fault detection apparatus 20 of the present application further includes a power source electrically connected to the detection component 210, the controller 220, and the wireless communicator 240 to supply power to the detection component 210, the controller 220, and the wireless communicator 240. In some embodiments of the present application, the power source may be a lithium battery or a dry cell battery. In other embodiments of the present application, the power source may also be an ac-to-dc converter circuit. When the power supply is an alternating current-direct current conversion circuit, the input end of the power supply can be connected with the mains supply, so that alternating current in the mains supply is obtained, and the alternating current is converted into direct current. The output of the power supply may be electrically connected to the sensing assembly 210, the controller 220, and the wireless communicator 240 to output direct current to the sensing assembly 210, the controller 220, and the wireless communicator 240. The sensing assembly 210, the controller 220, and the wireless communicator 240 operate on a supply of power of direct current.
In one embodiment, as shown in fig. 2, the detection component 210 of the power distribution network fault detection apparatus 20 of the present application includes a current transformer 212.
Specifically, the current transformer 212 may be sleeved on a line to be tested of the power distribution network 10 and electrically connected to the line to be tested, so as to obtain a current signal in the line to be tested. The current transformer 212 may also be electrically connected to the controller 220 such that upon obtaining the current signal, the current signal is communicated to the controller 220.
In the embodiment of the present application, the current transformer 212 is an instrument that converts a large primary-side current into a small secondary-side current by using the principle of electromagnetic induction to measure. The current transformer 212 may be comprised of a closed iron core and two windings wound around the iron core. The winding with less turns is a primary winding, and the winding with more turns is a secondary winding. The primary winding may be electrically connected in series in the line under test. The secondary winding may be electrically connected to a meter. When the current transformer 212 works, the current in the line to be measured needs to pass through the primary side winding, so that the current in the line to be measured, namely the current signal of the line to be measured, can be measured by using the measuring instrument according to the electromagnetic induction principle. The power distribution network fault detection device 20 can measure the current signal in the line to be detected through the current transformer 212, thereby effectively identifying hidden dangers such as circuit ignition and the like and improving the reliability of the power distribution network fault detection device 20 in the power distribution network 10.
In one embodiment, as shown in fig. 2, the detection component 210 of the power distribution network fault detection apparatus 20 of the present application includes a leakage current sensor 214.
Specifically, the leakage current sensor 214 may be sleeved on a line to be tested of the power distribution network 10 and electrically connected to the line to be tested, so as to obtain a leakage current signal in the line to be tested. Leakage current sensor 214 may also be electrically coupled to controller 220 such that, upon acquiring the leakage current signal, the leakage current signal is communicated to controller 220.
In the embodiment of the present application, the leakage current sensor 214 may be a current transformer in a pincer shape. The leakage current sensor 214 also includes a core and two windings wound around the core, both windings being electrically connected to the line under test. If no leakage current exists in the line to be tested, when current flows through the line to be tested, the current vector sum in the two windings is zero because the current in each winding is equal in magnitude and opposite in direction. If there is leakage current in the line to be tested, the sum of the current vectors in the two windings is no longer equal to zero, and there is induced potential generated in the leakage current sensor 214. Therefore, whether the leakage current is generated or not can be detected, and the magnitude of the leakage current can be detected according to the magnitude of the induction potential. The power distribution network fault detection device 20 of the application can detect the leakage current signal in the line to be detected through the leakage current sensor 214, so that the reliability of the power distribution network fault detection device 20 in the power distribution network 10 is improved.
In one embodiment, as shown in fig. 2, the power distribution network fault detection apparatus 20 of the present application, the detection component 210 thereof includes a temperature sensor 216.
Specifically, the temperature sensor 216 may be attached to the line to be tested, so as to obtain a temperature signal of the line to be tested. Here, the attached connection means that the temperature sensor 216 is attached to the surface of the line to be measured. The temperature sensor 216 may also be electrically connected to the controller 220 such that upon acquiring a temperature signal, the temperature signal is communicated to the controller 220.
In the embodiment of the present application, the Temperature sensor 216 may be an NTC (Negative Temperature CoeffiCient thermistor) type Temperature sensor 216 or a PTC (Positive Temperature CoeffiCient thermistor) type Temperature sensor 216. When the line to be tested has faults such as short circuit, the line to be tested generates high temperature. At this time, the temperature sensor 216 can detect the high temperature condition of the line to be tested and transmit the temperature signal to the controller 220. The power distribution network fault detection device 20 of the application can measure the temperature signal of the line to be detected through the temperature sensor 216, so that the high-temperature protection of the line in the power distribution network 10 is realized.
In one embodiment, as shown in fig. 2, the power distribution network fault detection apparatus 20 of the present application, the detection component 210 thereof includes a partial discharge tester 218.
Specifically, the partial discharge tester 218 is electrically connected to the line under test, so as to obtain a partial discharge signal in the line under test. The partial discharge tester 218 may also be electrically connected to the controller 220 so that after acquiring the partial discharge signal, the partial discharge signal is passed to the controller.
Generally, faults of the voltage transformation device in the power distribution network 10 are mostly caused by partial discharge, and a partial discharge signal of the power distribution network 10 can effectively reflect an insulation condition of the power distribution network 10. The power distribution network fault detection device 20 detects the partial discharge signal of the power distribution network 10 through the partial discharge tester 218, and is good in real-time performance and high in sensitivity. Meanwhile, each line to be detected is detected by a partial discharge signal, and then the power distribution network 10 can be positioned in a fault manner, so that whether the partial discharge of the power distribution network 10 is external interference or internal partial discharge is determined, and the reliability of the power distribution network fault detection device 20 in the power distribution network 10 is improved.
In one embodiment, as shown in fig. 2, the power distribution network fault detection apparatus 20 of the present application further includes a signal shielding device 250.
In particular, the signal shield 250 is used to shield electromagnetic interference signals. The signal shield 250 may be electrically connected to the controller 220 such that when the controller 220 is powered on, the signal shield 250 is controlled to be powered on. The signal shielding device 250 is operable to generate a shielding range within which external electromagnetic interference signals are shielded. In the embodiment of the present application, the detecting component 210 may be disposed adjacent to the signal shielding device 250, so that the detecting component 210 is located within the shielding range of the signal shielding device 250, thereby reducing external electromagnetic interference when the detecting component 210 detects circuit parameters, and improving the accuracy of the detection result.
In an embodiment, the Wireless communicator 240 of the power distribution network fault detection apparatus 20 of the present application may be at least one of a WIFI (Wireless-Fidelity) communicator, a bluetooth communicator, a 4G communicator, a 5G communicator, or a cellular communicator.
In one embodiment, as shown in fig. 3, the controller 220 of the power distribution network fault detection apparatus 20 of the present application includes a signal processing circuit 221 and a single chip microcomputer 229 electrically connected to the signal processing circuit 221. The signal processing circuit 221 includes a filter circuit 222, an amplifier circuit 224, an analog-to-digital conversion circuit 226, and a comparator circuit 228, which are electrically connected in sequence along the transmission direction of the electrical signal.
Specifically, the signal processing circuit 221 is configured to obtain a circuit parameter output by the detection component 210, and compare the circuit parameter with a preset threshold to obtain a comparison result. The single chip microcomputer 229 is electrically connected to the signal processing circuit 221, and is configured to obtain a comparison result obtained by the signal processing circuit 221, and generate a control instruction according to the comparison result. In other words, the signal processing circuit 221 is used to implement the "preset program" in the above-described embodiment, and the single chip microcomputer 229 is used to implement the "control instruction generation according to the comparison result" in the above-described embodiment.
The signal processing circuit 221 may include a filter circuit 222, an amplification circuit 224, an analog-to-digital conversion circuit 226, and a comparison circuit 228. Wherein the filter circuit 222 can be electrically connected with the detection component 210. After the detection component 210 obtains the circuit parameter of the line to be detected, the circuit parameter is transmitted to the filter circuit 222 in an electrical signal manner. The filter circuit 222 may filter the electrical signal to remove noise from the electrical signal. The amplification circuit 224 may be electrically connected to the filtering circuit 222. In other words, the filter circuit 222 is electrically connected between the detection component 210 and the amplifying circuit 224. The amplifying circuit 224 is used for linearly amplifying the filtered electrical signal. The analog-to-digital conversion circuit 226 may be electrically connected to the amplification circuit 224. In other words, the amplifying circuit 224 is electrically connected between the filter circuit 222 and the analog-to-digital conversion circuit 226. Analog-to-digital conversion circuitry 226 may convert the amplified electrical signal to a digital signal for identification by comparison circuitry 228. The comparison circuit 228 may have a first input, a second input, and an output. A first input of the comparison circuit 228 may be connected to the analog-to-digital conversion circuit 226 for obtaining a digital signal that characterizes a circuit parameter of the line under test. A second input of the comparison circuit 228 may be used for inputting a preset threshold. For example, the second input terminal of the comparison circuit 228 may be connected to a read only memory, and the read only memory may have a preset threshold stored therein. The comparison circuit can compare the circuit parameter with a preset threshold value and obtain a comparison result. The output of the comparison circuit 228 may be electrically connected to the one-chip microcomputer 229, so as to output the comparison result to the one-chip microcomputer 229.
The single chip microcomputer 229 generates a control instruction according to the comparison result. Generally, the comparison result of the comparison circuit 228 includes "the circuit parameter is within the preset threshold" or "the circuit parameter exceeds the preset threshold". When the comparison result is that the circuit parameter is within the preset threshold, the single chip microcomputer 229 may generate a first control instruction, so as to control the switching device 230 to be closed, so that the line to be tested is kept on. When the comparison result is that the "circuit parameter exceeds the preset threshold", the single chip microcomputer 229 may generate a second control instruction, so as to control the switching device 230 to be turned off, so that the line to be tested is turned off.
In one embodiment, as shown in fig. 2, the power distribution network fault detection apparatus 20 of the present application further includes an alarm 260.
Specifically, the alarm 260 is electrically connected to the controller 220, so as to obtain a control command of the controller 220 and operate according to the control command. When the circuit parameter exceeds the preset threshold, the controller 220 may issue a control command to control the switching device 230 to turn off, and at the same time, control the alarm 260 to operate, thereby issuing an alarm signal. In the embodiment of the present application, the alarm 260 may be a buzzer or the like.
In an embodiment, the present application further provides a power distribution network fault detection system 30, which includes the power distribution network fault detection apparatus 20 in any one of the above embodiments.
Specifically, the power distribution network fault detection device 20 is used for performing fault detection on the power distribution network 10. The power distribution network 10 has a line to be tested, and the power distribution network fault detection apparatus 20 includes a detection component 210, a controller 220, a switching device 230, and a wireless communicator 240. The detecting component 210 is electrically connected to the line to be detected to obtain circuit parameters of the line to be detected, where the circuit parameters include current signals, leakage current signals, temperature signals, and local discharge signals of the line to be detected. The controller 220 is electrically connected to the detecting component 210 to obtain the circuit parameters and generate the control command according to the circuit parameters. The switching device 230 is electrically connected to the line to be tested, and the switching device 230 is further electrically connected to the controller 220 to control the on/off of the circuit of the line to be tested according to the control instruction. The wireless communicator 240 is electrically connected to the controller 220, and is configured to obtain the circuit parameters, convert the circuit parameters into wireless communication signals, and transmit the wireless communication signals.
In an embodiment, as shown in fig. 4, the power distribution network fault detection system 30 of the present application may further include a monitoring terminal 32.
Specifically, the monitoring terminal 32 is in communication connection with the wireless communicator 240, so as to obtain a wireless communication signal sent by the wireless communicator 240, and obtain a circuit parameter according to the wireless communication signal. Generally, the monitoring terminal 32 may be a mobile phone, a tablet computer, a personal computer or a palm computer with a wireless receiving function.
The power distribution network fault detection system 30 can remotely monitor circuit parameters of the line to be detected, so as to judge whether the line to be detected has a fault or not. The fault position of the power distribution network 10 can be obtained by performing fault detection on the line to be detected of the power distribution network 10, so that inconvenience caused by manual detection of the fault position of the power distribution network 10 is avoided.
Further, the power distribution network fault detection system 30 of the present application may also send an instruction to the wireless communicator 240 through the monitoring terminal 32, so as to set the preset parameter.
Specifically, the user may input the preset threshold value through the monitoring terminal 32. After acquiring the preset threshold, the monitoring terminal 32 converts the preset threshold into a wireless communication signal and transmits the wireless communication signal to the wireless communicator 240. The controller 220 may obtain the preset threshold through the wireless communicator 240, thereby completing the setting of the preset threshold.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a power distribution network fault detection device for carry out fault detection to power distribution network, power distribution network has the circuit that awaits measuring, power distribution network fault detection device includes:
the detection assembly is electrically connected with the line to be detected so as to obtain circuit parameters of the line to be detected, and the circuit parameters comprise current signals, leakage current signals, temperature signals and local discharge signals of the line to be detected;
the controller is electrically connected with the detection assembly to acquire the circuit parameters and generate a control instruction according to the circuit parameters;
the switching device is electrically connected with the circuit to be tested and is also electrically connected with the controller so as to control the on-off of the circuit to be tested according to the control instruction;
and the wireless communicator is electrically connected with the controller and is used for acquiring the circuit parameters and converting the circuit parameters into wireless communication signals for transmission.
2. The power distribution network fault detection device of claim 1, wherein the detection assembly comprises a current transformer electrically connected to the line under test to obtain the current signal of the line under test;
the current transformer is also electrically connected with the controller, so that the controller acquires the current signal of the line to be tested.
3. The power distribution network fault detection device of claim 1, wherein the detection assembly comprises a leakage current sensor electrically connected to the line under test to obtain the leakage current signal of the line under test;
the leakage current sensor is also electrically connected with the controller, so that the controller acquires the leakage current signal of the line to be detected.
4. The power distribution network fault detection device of claim 1, wherein the detection component comprises a temperature sensor, and the temperature sensor is attached to the line to be detected to obtain the temperature signal of the line to be detected;
the temperature sensor is also electrically connected with the controller, so that the controller acquires the temperature signal of the line to be detected.
5. The power distribution network fault detection device of claim 1, wherein the detection assembly comprises a partial discharge tester electrically connected to the line under test to obtain the partial discharge signal of the line under test;
the partial discharge tester is also electrically connected with the controller so that the controller acquires the partial discharge signal of the line to be tested.
6. The power distribution network fault detection device of claim 1, further comprising:
the signal shielding device is electrically connected with the controller so as to control the signal shielding device to work when the controller works, and the detection assembly is located in the shielding range of the signal shielding device.
7. The power distribution network fault detection device of claim 1, wherein the wireless communicator comprises at least one of a bluetooth communicator and a cellular communicator.
8. The power distribution network fault detection device of claim 1, wherein the controller comprises a signal processing circuit, the signal processing circuit comprises a filter circuit, an amplifier circuit, an analog-to-digital conversion circuit and a comparator circuit, and the filter circuit, the amplifier circuit, the analog-to-digital conversion circuit and the comparator circuit are electrically connected in sequence along a transmission direction of an electrical signal.
9. The power distribution network fault detection device of claim 8, further comprising:
and the alarm is electrically connected with the controller so as to obtain the control instruction and work according to the control instruction.
10. A power distribution network fault detection system, characterized by comprising a power distribution network fault detection apparatus according to any one of claims 1 to 9.
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| CN202010876108.2A CN112114228A (en) | 2020-08-27 | 2020-08-27 | Power distribution network fault detection device and system |
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| CN202010876108.2A CN112114228A (en) | 2020-08-27 | 2020-08-27 | Power distribution network fault detection device and system |
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| CN112114228A true CN112114228A (en) | 2020-12-22 |
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| CN114062858A (en) * | 2021-10-26 | 2022-02-18 | 西安理工大学 | Fault identification and detection system for 5G technology distribution network equipment |
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Application publication date: 20201222 |