CN112114228A - Power distribution network fault detection device and system - Google Patents

Abstract

The invention relates to a power distribution network fault detection device and system, which are used for fault detection of a line to be tested in the power distribution network. The power distribution network fault detection device includes a detection component, a controller, a switch device and a wireless communicator. The detection component is used to detect the circuit parameters of the line to be tested, and the wireless communicator can convert the circuit parameters into wireless communication signals for transmission, so as to facilitate the remote monitoring of the circuit parameters. When the circuit parameters exceed the preset threshold, the controller can control the switching device to disconnect, so that the line to be tested is powered off, thereby ensuring the safety of power supply of the power distribution network. The power distribution network fault detection device can remotely monitor the circuit parameters of the line to be tested, thereby judging whether the line to be tested is faulty or not. The fault location of the power distribution network can be obtained by fault detection of the line to be tested in the power distribution network, thereby avoiding the inconvenience caused by manual detection of the fault location of the power distribution network.

Description

Power distribution network fault detection device and system

technical field

The present invention relates to the technical field of electric power detection, in particular to a power distribution network fault detection device and system.

Background technique

The power distribution network is a power supply system that can directly distribute power to users. The reliability of its power supply capability and power quality has a great impact on users.

In the traditional technology, whether the power distribution network is faulty or not and the fault location is usually detected manually.

In the process of realizing the traditional technology, the inventor found that it takes a lot of manpower, material resources and time to manually detect the fault location of the power distribution network.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a power distribution network fault detection device and system for the problem that manual detection of the fault location of the power distribution network requires a lot of manpower, material resources and time in the traditional technology.

A power distribution network fault detection device is used for fault detection of a power distribution network, the power distribution network has a line to be tested, and the power distribution network fault detection device includes:

a detection component, electrically connected to the line to be tested, to obtain circuit parameters of the line to be tested, the circuit parameters including the magnitude of the current signal, leakage current signal, temperature signal and partial discharge signal of the line to be tested;

a controller, electrically connected with the detection component, to obtain the circuit parameters, and generate a control instruction according to the circuit parameters;

a switching device, which is electrically connected to the line to be tested, and the switching device is also electrically connected to the controller, so as to control the on-off of the circuit of the line to be tested according to the control instruction;

A wireless communicator, electrically connected to the controller, for acquiring the circuit parameters, and converting the circuit parameters into wireless communication signals for transmission.

In one of the embodiments, the detection component includes a current transformer, and the current transformer is 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 to the controller, so that the controller acquires the current signal of the line to be tested.

In one of the embodiments, the detection component includes a leakage current sensor, and the leakage current sensor is 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 under test.

In one of the embodiments, the detection component includes a temperature sensor, and the temperature sensor is attached and connected to the line to be tested, so as to obtain the temperature signal of the line to be tested;

The temperature sensor is also electrically connected to the controller, so that the controller acquires the temperature signal of the line to be measured.

In one of the embodiments, the detection component includes a partial discharge tester, and the partial discharge tester is 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 to 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 device further includes:

The signal shield is electrically connected to the controller, so that when the controller works, the signal shield is controlled to work, and the detection component is located within the shielding range of the signal shield.

In one of the embodiments, the wireless communicator includes at least one of a Bluetooth communicator and a cellular communicator.

In one of the embodiments, the controller includes a signal processing circuit, the signal processing circuit includes a filter circuit, an amplifier circuit, an analog-to-digital conversion circuit and a comparison circuit, the filter circuit, the amplifier circuit, the analog-to-digital circuit The conversion circuit and the comparison circuit are electrically connected in sequence along the direction of electrical signal transmission.

In one embodiment, the power distribution network fault detection device further includes:

An alarm is electrically connected with the controller to obtain the control instruction and work according to the control instruction.

A power distribution network fault detection system includes the power distribution network fault detection device described in any one of the above embodiments.

The above-mentioned power distribution network fault detection device can perform fault detection on the line to be tested in the power distribution network. The power distribution network fault detection device includes a detection component, a controller, a switch device and a wireless communicator. The detection component is used to detect the circuit parameters of the line to be tested, and the wireless communicator can convert the circuit parameters into wireless communication signals for transmission, thereby facilitating the remote monitoring of the circuit parameters. When the circuit parameters exceed the preset threshold, the controller can control the switching device to disconnect, so that the line to be tested is powered off, thereby ensuring the safety of power supply of the power distribution network. The power distribution network fault detection device can remotely monitor the circuit parameters of the line to be tested, thereby judging whether the line to be tested is faulty or not. The fault location of the power distribution network can be obtained by fault detection of the line to be tested in the power distribution network, thereby avoiding the inconvenience caused by manual detection of the fault location of the power distribution network.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the traditional technology, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the traditional technology. Obviously, the drawings in the following description are only the For some embodiments of the application, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a power distribution network fault detection device in an embodiment of the application;

2 is a schematic structural diagram of a power distribution network fault detection device in another embodiment of the present application;

3 is a schematic structural diagram of a power distribution network fault detection device in another embodiment of the present application;

FIG. 4 is a schematic structural diagram of a power distribution network fault detection system according to an embodiment of the present application.

Among them, the meanings represented by the reference symbols are as follows:

10. Power distribution network; 12. Main road; 14. Branch circuit; 20. Power distribution network fault detection device; 210. Detection component; 212. Current transformer; 214. Leakage current sensor; 216. Temperature sensor; Discharge tester; 220, controller; 221, signal processing circuit; 222, filter circuit; 224, amplifier circuit; 226, analog-to-digital conversion circuit; 228, comparison circuit; 229, microcontroller; 230, switching device; 240, wireless communication 250, signal jammer; 260, alarm; 30, power distribution network fault detection system; 32, monitoring terminal.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

The serial numbers themselves, such as "first", "second", etc., for the components herein are only used to distinguish the described objects, and do not have any order or technical meaning. The "connection" and "connection" mentioned in this application, unless otherwise specified, include both direct and indirect connections (connections). In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description , rather than indicating or implying that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation on the present application.

In this application, unless otherwise expressly stated and defined, a first feature "on" or "under" a second feature may be in direct contact with the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The power distribution network is a power supply system that can directly distribute power to users. As shown in FIG. 1 , the power distribution network may include a trunk circuit and a plurality of branch circuits electrically connected to the trunk circuit. The present application provides a fault detection device for a power distribution network, which can detect whether the power distribution network is faulty or not, and the location where the fault occurs in the power distribution network.

In the embodiments of the present application, the electrical connection between two devices refers to the connection between the two devices through wires or wirelessly, so that electrical signals can be transmitted between the two devices. The communication connection between the two devices refers to a wired or wireless connection between the two devices, so as to transmit the wire signal.

In one embodiment, as shown in FIG. 1 , the present application provides a power distribution network fault detection device 20 for performing fault detection on a line to be tested in the power distribution network 10 , thereby judging whether the line to be tested is faulty. The line to be tested here can be any trunk 12 and branch 14 of the power distribution network 10 . The power distribution network fault detection device 20 includes a detection component 210 , a controller 220 , a switching device 230 and a wireless communicator 240 .

Specifically, the detection component 210 can be electrically connected with the circuit to be tested, so as to detect the circuit to be tested to obtain circuit parameters of the circuit to be tested. In the embodiment of the present application, the circuit parameter of the line to be tested includes at least one of the magnitude of the current signal, the leakage current signal, the temperature signal and the partial discharge signal of the line to be tested. 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 tested refers to the temperature value of the line to be tested. The magnitude of the partial discharge signal of the line to be tested refers to the magnitude of the partial discharge current in the line to be tested.

The controller 220 may be electrically connected with the detection component 210 to obtain circuit parameters and generate control instructions according to the circuit parameters. In other words, after the detection component 210 acquires the circuit parameters of the line to be tested, it can transmit the circuit parameters of the line to be tested to the controller 220 . A preset program and a preset threshold may be preset in the controller 220, so that after acquiring the circuit parameters of the circuit to be tested, the preset program is run to compare the circuit parameters of the circuit to be tested with the preset threshold. In the embodiment of the present application, the circuit parameter may include at least one of the magnitude of the current signal, the leakage current signal, the temperature signal and the partial discharge signal of the line under test. Therefore, for circuit parameters, the preset thresholds may also be respectively provided with current thresholds, leakage current thresholds, temperature thresholds and partial discharge thresholds. After the controller 220 compares the circuit parameters with the preset threshold, a control instruction can be generated according to the comparison result.

The switching device 230 is electrically connected to the circuit under test, so as to control the circuit on and off of the circuit under test. When the switching device 230 is closed, the line to be tested is turned on, and power can be distributed to the user. When the switching device 230 is turned off, the circuit to be tested cannot be turned on, and power distribution cannot be realized. The switching device 230 is also electrically connected with the controller 220, so as to obtain the control instructions generated by the controller 220, and work according to the control instructions. In other words, the controller 220 can control the switching device 230 to be turned on or off through the control command, so as to control whether the circuit to be tested is turned on or off. In the embodiment of the present application, the switching device 230 may be a three-terminal device, such as an IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor). The switching device 230 may have a first terminal, a second terminal and a third terminal, and the first terminal is used to control whether the connection between the second terminal and the third terminal is conducted or not. In this way, the second end and the third end of the switching device 230 can be electrically connected to the circuit under test. The first end of the switching device 230 may be electrically connected to the controller 220, so that after the control command is transmitted to the first end of the switching device 230, the conduction between the second end and the third end is controlled.

The wireless communicator 240 is electrically connected to the controller 220 for acquiring circuit parameters, and converting the circuit parameters into wireless communication signals for transmission. In other words, the wireless communicator 240 is used to convert wired signals into wireless signals and transmit them. After the controller 220 acquires the circuit parameters of the line to be tested, the circuit parameters can be transmitted to the wireless communicator 240 . The wireless communicator 240 may convert circuit parameters into wireless communication signals for transmission. In this way, when other terminals with wireless communication function 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 works, the detection component 210 can detect and obtain the circuit parameters of the line to be tested. After the detection component 210 acquires the circuit parameters, the circuit parameters can be transmitted to the controller 220 . A preset program and a preset threshold can be preset in the control, so that after obtaining the circuit parameters of the circuit to be tested, the preset program is run, the circuit parameters of the circuit to be tested are compared with the preset threshold, and the control is obtained according to the comparison result. instruction. The controller 220 controls the on or off of the switch device 230 according to the control instruction, and further controls whether the circuit to be tested is turned on or off. At the same time, the controller 220 can also transmit the circuit parameters to the wireless communicator 240, so as to transmit the circuit parameters through wireless communication, so as to facilitate the remote monitoring of the circuit parameters. The power distribution network fault detection device 20 can remotely monitor the circuit parameters of the line to be tested, thereby judging whether the line to be tested is faulty or not. The power distribution network 10-row detection device of the present application can remotely monitor circuit parameters, thereby judging whether each circuit parameter is normal, which is convenient for short-circuit, leakage current, high temperature, partial discharge and other faults in the power distribution network 10. The switch device 230 is controlled by the controller 220 to cut off the line to be tested. By performing fault detection on the line under test of the power distribution network 10, the fault location of the power distribution network 10 can be obtained, thereby avoiding the inconvenience caused by manual detection of the fault location of the power distribution network 10, and improving the circuit performance of the power distribution network 10. safety.

It should be noted that, in the above embodiments, for the convenience of description, the power distribution network 10 is introduced to explain the power distribution network fault detection device 20 of the present application. However, in practical applications, the power distribution network fault detection device 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 to say, the power distribution network 10 is an environmental element of the power distribution network fault detection device 20 of the present application, and its introduction or not should not be construed as a limitation on 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 can be preset in the line to be tested in the power distribution network 10, so that when the circuit parameters in the line to be tested are abnormal, the fault location can be determined, and the Safety of lines in the power distribution network 10 .

In one embodiment, each branch 14 and main circuit 12 of the power distribution network 10 may be a line to be tested, and the power distribution network 10 to be subjected to fault detection may have several lines to be tested. The power distribution network fault detection device 20 of the present application may include several detection components 210 and several switching devices 230 . Corresponding to several lines to be tested, several preset thresholds and several preset programs may also be set in the controller 220 . Wherein, each detection component 210 can be electrically connected with a circuit to be tested, so as to obtain circuit parameters of the circuit to be tested. Each switching device 230 can be electrically connected to a line to be tested, so as to control the on-off of the line to be tested. When the power distribution network fault detection device 20 is working, the controller 220 can generate a control instruction according to the circuit parameters of each line to be tested, so as to control whether the line to be tested is connected or not.

In one embodiment, the power distribution network fault detection device 20 of the present application further includes an electrical connection with 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 power supply. In some embodiments of the present application, the power source may be a lithium battery or a dry battery. In other embodiments of the present application, the power source may also be an AC-DC conversion circuit. When the power supply is an AC-DC conversion circuit, the input end of the power supply can be connected to the mains, so as to obtain the AC in the mains and convert the AC into DC. The output end of the power source may be electrically connected with the detection assembly 210 , the controller 220 and the wireless communicator 240 , so as to output direct current to the detection assembly 210 , the controller 220 and the wireless communicator 240 . The detection assembly 210, the controller 220 and the wireless communicator 240 operate under the power supply of direct current.

In one embodiment, as shown in FIG. 2 , the detection component 210 of the power distribution network fault detection device 20 of the present application includes a current transformer 212 .

Specifically, the current transformer 212 can be sleeved on the line under test of the power distribution network 10 and electrically connected with the line under test, so as to obtain the current signal in the line under test. The current transformer 212 may also be electrically connected to the controller 220 so as to transmit the current signal to the controller 220 after acquiring the current signal.

In the embodiment of the present application, the current transformer 212 is an instrument that uses the principle of electromagnetic induction to convert a large current on the primary side into a small current on the secondary side for measurement. The current transformer 212 may consist of a closed iron core and two windings wound around the iron core. The winding with fewer turns is the primary winding, and the winding with more turns is the secondary winding. The primary winding can be electrically connected in series with the line to be tested. The secondary winding can be electrically connected to the measuring instrument. When the current transformer 212 is working, all the current in the line to be tested needs to pass through the primary side winding, so the current in the line to be tested can be measured by the measuring instrument through the principle of electromagnetic induction, that is, the current signal of the line to be tested . The power distribution network fault detection device 20 of the present application can measure the current signal in the line to be tested through the current transformer 212, thereby effectively identifying hidden dangers such as circuit ignition, and improving the power distribution network fault detection device 20 in the power distribution network 10. reliability.

In one embodiment, as shown in FIG. 2 , the detection component 210 of the power distribution network fault detection device 20 of the present application includes a leakage current sensor 214 .

Specifically, the leakage current sensor 214 can be set on the line under test of the power distribution network 10 and electrically connected with the line under test, so as to acquire the leakage current signal in the line under test. The leakage current sensor 214 may also be electrically connected with the controller 220 , so that after acquiring the leakage current signal, the leakage current signal is transmitted to the controller 220 .

In the embodiment of the present application, the leakage current sensor 214 may be a clamp-shaped current transformer. The leakage current sensor 214 also includes an iron core and two windings wound around the iron core, both of which are electrically connected to the circuit to be tested. If there is no leakage current in the line under test, when there is current passing through the line under test, since the current in each winding is equal in magnitude and opposite in direction, the vector sum of the currents in the two windings is zero. If there is a leakage current in the line to be measured, the vector sum of the currents in the two windings is no longer equal to zero, and an induced potential is generated in the leakage current sensor 214 at this time. According to this, it is possible to detect whether the leakage current is generated or not, and according to the magnitude of the induced potential, the magnitude of the leakage current can be detected. The power distribution network fault detection device 20 of the present application can detect the leakage current signal in the line to be tested through the leakage current sensor 214 , thereby 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 device 20 of the present application includes a temperature sensor 216 .

Specifically, the temperature sensor 216 can be attached and connected to the line to be tested, so as to acquire the temperature signal of the line to be tested. The attached connection here means that the temperature sensor 216 is attached to the surface of the circuit to be tested. The temperature sensor 216 may also be electrically connected to the controller 220 so as to transmit the temperature signal to the controller 220 after acquiring the temperature signal.

In the embodiment of the present application, the temperature sensor 216 may be an NTC (Negative Temperature CoeffiCient, negative temperature coefficient thermistor) type temperature sensor 216 or a PTC (Positive Temperature CoeffiCient, positive temperature coefficient thermistor) type temperature sensor 216 . When a fault such as a short circuit occurs in the line under test, the line under test will generate high temperature. At this time, the temperature sensor 216 can detect the high temperature of the circuit under test, and transmit the temperature signal to the controller 220 . The power distribution network fault detection device 20 of the present application can measure the temperature signal of the line to be measured through the temperature sensor 216 , thereby realizing high temperature protection of the line 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 device 20 of the present application includes a partial discharge tester 218 .

Specifically, the partial discharge tester 218 is electrically connected to the line under test, so as to obtain the partial discharge signal in the line under test. The partial discharge tester 218 may also be electrically connected to the controller 220 so as to transmit the partial discharge signal to the control after acquiring the partial discharge signal.

Generally, the failure of the transformer device in the power distribution network 10 is mostly caused by partial discharge, and the partial discharge signal of the power distribution network 10 can effectively reflect the insulation condition of the power distribution network 10 . The power distribution network fault detection device 20 of the present application detects the partial discharge signal of the power distribution network 10 through the partial discharge tester 218, and has good real-time performance and high sensitivity. At the same time, by detecting the partial discharge signal of each line to be tested, the fault location of the power distribution network 10 can be carried out, so as to distinguish whether the partial discharge of the power distribution network 10 is external interference or internal partial discharge, which improves the power distribution network fault. The reliability of the detection device 20 in the power distribution network 10 .

In one embodiment, as shown in FIG. 2 , the power distribution network fault detection device 20 of the present application further includes a signal jammer 250 .

Specifically, the signal shield 250 is used for shielding electromagnetic interference signals. The signal jammer 250 may be electrically connected to the controller 220, so that when the controller 220 is powered on and operated, the signal jammer 250 is controlled to be powered on and work. When the signal shielding device 250 works, a shielding range can be generated, and the external electromagnetic interference signal can be shielded within the shielding range. In the embodiment of the present application, the detection component 210 may be disposed adjacent to the signal shield 250, so that the detection component 210 is located within the shielding range of the signal shield 250, thereby reducing external disturbances when the detection component 210 detects circuit parameters. Electromagnetic interference, improve the accuracy of detection results.

In one embodiment, the wireless communicator 240 of the power distribution network fault detection device 20 of the present application may be a WIFI (Wireless-Fidelity, wireless fidelity) communicator, a Bluetooth communicator, a 4G communicator, a 5G communicator or a cellular communicator at least one of communicators.

In one embodiment, as shown in FIG. 3 , the controller 220 of the power distribution network fault detection device 20 of the present application includes a signal processing circuit 221 and a single chip 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 comparison circuit 228 that are electrically connected in sequence along the electrical signal transmission direction.

Specifically, the signal processing circuit 221 is configured to acquire circuit parameters output by the detection component 210, and compare the circuit parameters with a preset threshold to obtain a comparison result. The single chip 229 is electrically connected to the signal processing circuit 221, and is used for acquiring the comparison result obtained by the signal processing circuit 221, and generating 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-mentioned embodiment, and the single-chip microcomputer 229 is used to implement the "generating control instruction according to the comparison result" in the above-mentioned 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 acquires the circuit parameters of the line to be tested, the circuit parameters are transmitted to the filter circuit 222 in the form of electrical signals. The filter circuit 222 can filter the electrical signal to remove noise in the electrical signal. The amplification circuit 224 may be electrically connected to the filter 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 amplifier circuit 224 is electrically connected between the filter circuit 222 and the analog-to-digital conversion circuit 226 . The analog-to-digital conversion circuit 226 may convert the amplified electrical signal into a digital signal for identification by the comparison circuit 228 . The comparison circuit 228 may have a first input, a second input, and an output. The first input terminal of the comparison circuit 228 can be connected to the analog-to-digital conversion circuit 226 for acquiring a digital signal, where the digital signal represents the circuit parameters of the circuit to be tested. The second input terminal of the comparison circuit 228 may be used to input a preset threshold value. For example, a read-only memory may be connected to the second input terminal of the comparison circuit 228, and a preset threshold value may be stored in the read-only memory. The compared circuit can compare the circuit parameters with the preset threshold and obtain the comparison result. The output end of the comparison circuit 228 can be electrically connected to the single-chip microcomputer 229 so as to output the comparison result to the single-chip microcomputer 229 .

The microcontroller 229 generates a control instruction according to the comparison result. Generally speaking, the comparison result of the comparison circuit 228 includes two types: "the circuit parameter is within the preset threshold value" or "the circuit parameter exceeds the preset threshold value". When the comparison result is "the circuit parameter is within the preset threshold", the single-chip microcomputer 229 can generate a first control instruction, thereby controlling the switching device 230 to close, so that the circuit to be tested is kept on. When the comparison result is "the circuit parameter exceeds the preset threshold", the single-chip microcomputer 229 can generate a second control instruction, thereby controlling the switching device 230 to be disconnected, so that the circuit to be tested is disconnected.

In one embodiment, as shown in FIG. 2 , the power distribution network fault detection device 20 of the present application further includes an alarm 260 .

Specifically, the alarm device 260 is electrically connected to the controller 220, so as to obtain the control instruction of the controller 220, and work according to the control instruction. When the circuit parameter exceeds the preset threshold, the controller 220 may issue a control instruction to control the switching device 230 to be disconnected, and at the same time control the alarm 260 to work, thereby sending out an alarm signal. In the embodiment of the present application, the alarm 260 may be a buzzer or the like.

In one embodiment, the present application further provides a power distribution network fault detection system 30, including the power distribution network fault detection device 20 in any one of the above embodiments.

Specifically, the power distribution network fault detection device 20 is used for fault detection of the power distribution network 10 . The power distribution network 10 has a line to be tested, and the power distribution network fault detection device 20 includes a detection component 210 , a controller 220 , a switching device 230 and a wireless communicator 240 . The detection component 210 is electrically connected with the circuit to be tested to obtain circuit parameters of the circuit to be tested, the circuit parameters include the magnitude of the current signal, leakage current signal, temperature signal and partial discharge signal of the circuit to be tested. The controller 220 is electrically connected with the detection component 210 to obtain circuit parameters and generate control instructions according to the circuit parameters. The switching device 230 is electrically connected to the circuit to be tested, and the switching device 230 is also electrically connected to the controller 220 to control the circuit on and off of the circuit to be tested according to the control instruction. The wireless communicator 240 is electrically connected to the controller 220 for acquiring circuit parameters, and converting the circuit parameters into wireless communication signals for transmission.

In one 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 communicatively connected to the wireless communicator 240, thereby acquiring the wireless communication signal sent by the wireless communicator 240, and obtaining circuit parameters according to the wireless communication signal. Generally, the monitoring terminal 32 may be a mobile phone, a tablet computer, a personal computer or a palmtop computer with a wireless receiving function.

The power distribution network fault detection system 30 can remotely monitor the circuit parameters of the line to be tested, thereby judging whether the line to be tested is faulty or not. The fault location of the power distribution network 10 can be obtained by performing fault detection on the line under test of the power distribution network 10 , thereby avoiding the inconvenience caused by manually detecting the fault location of the power distribution network 10 .

Further, the power distribution network fault detection system 30 of the present application can also send an instruction to the wireless communicator 240 through the monitoring terminal 32 to set the preset parameters.

Specifically, the user can input the preset threshold 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 it to the wireless communicator 240 . The controller 220 may acquire the preset threshold through the wireless communicator 240, so as to complete the setting of the preset threshold.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention 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.

Images