Defect positioning device and method suitable for power distribution terminal

Abstract

The invention discloses a defect positioning device and method suitable for a power distribution terminal, and relates to the technical field of power grids, and the disclosed defect positioning device comprises a measurement and control host, a relay, and a plurality of indicating lamps. The measurement and control host is respectively connected with the relay and the indicating lamps, and is also connected with the distribution automation terminal through the aviation conversion head. The measurement and control host determines the switch position of the relay or the distribution automation terminal; the measurement and control host determines the operation state of each indicating lamp, and the operation state of each indicating lamp is associated with the switch position and the internal loop of the distribution automation terminal; the measurement and control host determines the defect position in the distribution automation terminal according to the switch position and the operation state of each indicating lamp. The defect position in the power distribution automation terminal is determined by combining the measurement and control host with the switch position of the relay and the operation state of the indicator lamp, so that automatic defect positioning can be realized, the process is effectively simplified, and the defect positioning efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power grids, and particularly to a defect location device and method applicable to distribution terminals. Background Art

[0002] At present, distribution automation in the power grid plays a key role in improving power supply reliability. Distribution automation terminals, such as distribution terminals or pole-mounted switches, as application forms of distribution automation technology, are capable of collecting, monitoring, and controlling status information of primary distribution network equipment, and completing functions such as status monitoring, calculation, fault detection, fault signal recording, control output, communication, local or remote control. The normal operation of distribution terminals is the guarantee for reducing power outages due to faults.

[0003] Due to the influence of operation years or operation environment, some potential hidden dangers may occur in existing distribution automation terminals. When there is a disconnection defect in the control loop of a distribution automation terminal, that is, a distribution terminal or a pole-mounted switch, the pole-mounted switch cannot be normally controlled and the remote control execution fails. Currently, the solution to the above problem is to find a manufacturer for defect detection to locate the defect position for repair, with a complex operation process and low location efficiency. Summary of the Invention

[0004] The main purpose of the present application is to provide a defect location device and method applicable to distribution terminals, aiming to solve the technical problems of complex operation process and low location efficiency.

[0005] To achieve the above purpose, the present application provides a defect location device applicable to a distribution terminal, where the defect location device includes: a measurement and control host, a relay, and a plurality of indicator lights; The measurement and control host is respectively connected to the relay and each of the indicator lights, and the measurement and control host is also connected to the distribution automation terminal through an aviation adapter; The measurement and control host is configured to determine the switch position of the relay or the distribution automation terminal; The measurement and control host is further configured to determine the operating status of each of the indicator lights, and the operating status of each of the indicator lights is associated with the switch position and the internal loop of the distribution automation terminal; The measurement and control host is further configured to determine the defect position in the distribution automation terminal according to the switch position and the operating status of each of the indicator lights.

[0006] In an embodiment, the distribution automation terminal is a pole-mounted switch, and the indicator lights at least include a closing indicator light and a tripping indicator light; Both the closing indicator light and the tripping indicator light are connected to the measurement and control host; The measurement and control host is further configured to determine the switch position of the pole-mounted switch; The measurement and control host is further configured to determine the operating status of the closing indicator light and the operating status of the opening indicator light. Both the closing indicator light and the opening indicator light are driven by the internal circuit of the pole-mounted switch based on the switch position of the pole-mounted switch. The measurement and control host is further configured to determine the defective position of the pole-mounted switch according to the switch position of the pole-mounted switch, the operating status of the closing indicator light, and the operating status of the opening indicator light.

[0007] In one embodiment, the internal circuit of the pole-mounted switch at least includes: a closing control circuit; The measurement and control host is further configured to determine whether the closing indicator light is on when the switch position of the pole-mounted switch is in the off position. The closing indicator light is driven by the closing control circuit when the pole-mounted switch is in the off position. The measurement and control host is further configured to determine that there is a disconnection defect in the closing control circuit of the pole-mounted switch when the closing indicator light is not on.

[0008] In one embodiment, the internal circuit of the pole-mounted switch further includes: an opening control circuit; The measurement and control host is further configured to determine whether the opening indicator light is on when the switch position of the pole-mounted switch is in the on position. The opening indicator light is driven by the opening control circuit when the pole-mounted switch is in the on position. The measurement and control host is further configured to determine that there is a disconnection defect in the opening control circuit of the pole-mounted switch when the opening indicator light is not on.

[0009] In one embodiment, the indicator lights further include a switch-side off-position indicator light and a switch-side on-position indicator light; Both the switch-side off-position indicator light and the switch-side on-position indicator light are connected to the measurement and control host; The measurement and control host is further configured to determine the operating status of the switch-side off-position indicator light and the operating status of the switch-side on-position indicator light; The measurement and control host is further configured to determine that the pole-mounted switch is in the off position when the switch-side off-position indicator light is on and the switch-side on-position indicator light is not on; The measurement and control host is further configured to determine that the pole-mounted switch is in the on position when the switch-side off-position indicator light is not on and the switch-side on-position indicator light is on; The measurement and control host is further configured to determine that there is a defect in the switch position of the pole-mounted switch when the operating statuses of the switch-side off-position indicator light and the switch-side on-position indicator light are the same.

[0010] In one embodiment, the defect location device further includes: a display module; The display module is connected to the measurement and control host; The measurement and control host is further configured to sample the internal current of the pole-mounted switch to obtain a current sampling value; The measurement and control host is further configured to determine whether the current sampling value is within a preset current range; The measurement and control host is further configured to generate first display data indicating that there is no abnormality in the internal current of the pole-mounted switch when the current sampling value is within the preset current range; The measurement and control host is further configured to generate second display data indicating that there is an abnormality in the internal current of the pole-mounted switch when the current sampling value is not within the preset current range; The measurement and control host is further configured to display the first display data or the second display data on the display module.

[0011] In one embodiment, the distribution automation terminal is a distribution terminal, the indicator light further includes a terminal-side closing position indicator light and a terminal-side opening position indicator light, and the internal circuit of the distribution terminal at least includes a terminal-side control circuit; Both the terminal-side closing position indicator light and the terminal-side opening position indicator light are connected to the measurement and control host; The measurement and control host is further configured to determine the switch position of the relay; The measurement and control host is further configured to determine the operating states of the terminal-side closing position indicator light and the terminal-side opening position indicator light. Both the terminal-side closing position indicator light and the terminal-side opening position indicator light are driven by the distribution terminal based on the switch position of the relay; The measurement and control host is further configured to determine the defect location of the distribution terminal according to the switch position of the relay, the operating state of the terminal-side closing position indicator light, and the operating state of the terminal-side opening position indicator light.

[0012] In one embodiment, the measurement and control host is further configured to determine that there is a disconnection defect in the terminal-side control circuit of the distribution terminal when the switch position of the relay is in the opening position, the terminal-side closing position indicator light is not lit, and the terminal-side opening position indicator light is lit; The measurement and control host is further configured to determine that there is a disconnection defect in the terminal-side control circuit of the distribution terminal when the switch position of the relay is in the closing position, the terminal-side closing position indicator light is lit, and the terminal-side opening position indicator light is not lit.

[0013] In one embodiment, the defect location device further includes: a tripping trigger button and a closing trigger button; The opening trigger button and the closing trigger button are respectively connected to the measurement and control host; The measurement and control host is further configured to control the switch position of the relay to be switched to the off position when receiving an off-position drive signal triggered by the opening trigger button; The measurement and control host is further configured to control the switch position of the relay to be switched to the on position when receiving an on-position drive signal triggered by the closing trigger button.

[0014] In addition, to achieve the above object, the present application further provides a defect location method for a distribution terminal based on the above-mentioned defect location device for a distribution terminal. The defect location method for a distribution terminal includes the following steps: Determine the switch position of the relay or the distribution automation terminal; Determine the operating states of the respective indicator lights. The operating states of the respective indicator lights are associated with the switch position and the internal circuit of the distribution automation terminal; Determine the defect location in the distribution automation terminal according to the switch position and the operating states of the respective indicator lights.

[0015] One or more technical solutions proposed by the present application have at least the following technical effects: The defect location device for a distribution terminal of the present application includes: a measurement and control host, a relay, and a plurality of indicator lights; the measurement and control host is respectively connected to the relay and each indicator light, and the measurement and control host is further connected to the distribution automation terminal through an aviation adapter. The present application determines the switch position of the relay or the distribution automation terminal by the measurement and control host; the measurement and control host determines the operating states of the respective indicator lights. The operating states of the respective indicator lights are associated with the switch position and the internal circuit of the distribution automation terminal; the measurement and control host determines the defect location in the distribution automation terminal according to the switch position and the operating states of the respective indicator lights. Since the operating states of the respective indicator lights adopted by the present application are associated with the switch position and the internal circuit of the distribution automation terminal, and the defect location in the distribution automation terminal is determined by the measurement and control host in combination with the switch position of the relay and the operating states of the indicator lights, therefore, compared with the prior art, the present application can achieve automatic defect location without searching for the manufacturer, effectively simplifies the process, and improves the defect location efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the first embodiment of the defect location device applicable to the distribution terminal of the present application; Figure 2 It is a schematic structural diagram of the second embodiment of the defect location device applicable to the distribution terminal of the present application; Figure 3 It is a schematic flow diagram of the second embodiment of the present application; Figure 4 It is a schematic structural diagram of the third embodiment of the defect location device applicable to the distribution terminal of the present application; Figure 5 It is a front view of the measurement and control host in the third embodiment of the present application; Figure 6 It is an internal schematic diagram of the measurement and control host in the third embodiment of the present application; Figure 7 It is a schematic flow diagram of the defect location method applicable to the distribution terminal of the present application.

[0019] The realization of the purpose of the present application, functional features and advantages will be further described with reference to the embodiments and the drawings. Specific Embodiments

[0020] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0021] To better understand the technical solutions of the present application, the following will be described in detail with reference to the drawings in the specification and specific embodiments.

[0022] The main structure of the embodiment of the present application includes: a measurement and control host, a relay and a plurality of indicator lights; the measurement and control host is respectively connected to the relay and each indicator light, and the measurement and control host is also connected to the distribution automation terminal through an aviation adapter.

[0023] Since in the prior art, when a disconnection defect occurs in the distribution automation terminal, the defect is detected by finding the manufacturer to locate the defect location for repair, the operation process is complex and the location efficiency is low.

[0024] The present application provides a solution, in which a measurement and control host determines the switch positions of relays or distribution automation terminals; the measurement and control host determines the operating states of each indicator light, and the operating states of each indicator light are associated with the switch positions and the internal circuits of the distribution automation terminals; the measurement and control host determines the defect positions in the distribution automation terminals according to the switch positions and the operating states of each indicator light. Since the operating states of each indicator light adopted in the present application are associated with the switch positions and the internal circuits of the distribution automation terminals, and the defect positions in the distribution automation terminals are determined by the measurement and control host in combination with the switch positions of the relays and the operating states of the indicator lights, therefore, compared with the prior art, the present application can realize automatic defect location, without searching for the manufacturer, effectively simplifies the process, and improves the defect location efficiency.

[0025] Based on this, the present application provides a defect location device, referring to Figure 1 , Figure 1 which is a schematic structural diagram of the first embodiment of the defect location device applicable to the distribution terminal in the present application.

[0026] In this embodiment, the defect location device includes: a measurement and control host 10, a relay 20, and a plurality of indicator lights.

[0027] The measurement and control host 10 is respectively connected to the relay 20 and each of the indicator lights, and the measurement and control host 10 is also connected to the distribution automation terminal through an aviation adapter.

[0028] It should be noted that the above measurement and control host 10 can be a device for locating defects in the distribution automation terminal.

[0029] Among them, the above distribution automation terminal can be a terminal in the distribution automation system with functions such as data acquisition, control, and communication, and at least includes a pole-mounted switch 31 and a distribution terminal 32.

[0030] It can be understood that the above pole-mounted switch 31 can be a high-voltage electrical device installed on a support structure (such as a utility pole) for controlling and protecting the power distribution network, which can automatically disconnect the circuit in case of a fault, or the connection and disconnection of the circuit can be manually controlled by an operator when needed. The pole-mounted switch 31 includes but is not limited to an electromagnetic pole-mounted switch and an electronic pole-mounted switch.

[0031] It should be noted that the above distribution terminal 32 can be a device in the distribution automation system for realizing real-time monitoring, control, and protection of the distribution network. And the distribution terminal 32 can control the switch state of the pole-mounted switch 31. The distribution terminal 32 includes but is not limited to an electromagnetic distribution terminal and an electronic distribution terminal.

[0032] It should be understood that the above-mentioned pole-mounted switch 31 and the above-mentioned distribution terminal 32 complement each other in the power system. The pole-mounted switch 31 is responsible for directly controlling the on / off of the circuit, while the distribution terminal 32 controls the pole-mounted switch 31 based on the collected data. Therefore, in order to improve the operation efficiency and reliability of the power grid, it is necessary to perform defect location or detection on both the pole-mounted switch 31 and the distribution terminal 32 respectively.

[0033] It can be understood that the above-mentioned relay 20 can be a switching device that simulates the pole-mounted switch 31.

[0034] The measurement and control host 10 is used to determine the switch position of the relay or the distribution automation terminal.

[0035] It should be noted that the above-mentioned switch position can be the position where the switch is located. For example, when the switch is in the off position, it means the switch is in the open state, and when the switch is in the on position, it means the switch is in the closed state.

[0036] In a specific implementation, a position sensor for detecting the switch position can be set. When the distribution automation terminal for which defect location is required is the pole-mounted switch 31, the above-mentioned measurement and control host can determine the switch position of the pole-mounted switch 31 through this position sensor. Correspondingly, when the distribution automation terminal for which defect location is required is the distribution terminal 32, the above-mentioned relay 20 can simulate the pole-mounted switch 31, and the above-mentioned measurement and control host can determine the switch position of the relay 20 through this position sensor.

[0037] The measurement and control host 10 is also used to determine the operating status of each of the indicating lights, and the operating status of each of the indicating lights is associated with the switch position and the internal circuit of the distribution automation terminal.

[0038] It should be noted that the above-mentioned indicating lights can be divided into switch-side indicating lights and terminal-side indicating lights. When there is no defect in the internal circuit of the pole-mounted switch 31, the switch position of the pole-mounted switch 31 can control whether the switch-side indicating lights are connected to the internal circuit of the pole-mounted switch 31. When there is no defect in the internal circuit of the distribution terminal 32, the relay 20 can control whether the terminal-side indicating lights are connected to the internal circuit of the distribution terminal 32, so as to realize the association between the operating status of each indicating light, the switch position, and the internal circuit of the distribution automation terminal. The operating status of each indicating light is either on or off. The indicating light is on when it is connected to the internal circuit of the distribution automation terminal, and the indicating light is off when it is not connected to the internal circuit of the distribution automation terminal.

[0039] The measurement and control host 10 is also used to determine the defect location in the distribution automation terminal according to the switch position and the operating status of each of the indicating lights.

[0040] In specific implementation, when the internal circuit of the distribution automation terminal is in a normal state, the operating states of each indicator light under different switch positions can be determined in advance by the staff. When the measurement and control host 10 locates the defects of the distribution automation terminal, it can determine the operating states of each indicator light under the current switch position, and compare the operating states of each indicator light with the pre-determined operating states under the same switch position. When it is detected that the operating state of any indicator light is inconsistent with the pre-determined operating state under the same switch position, it is determined that the indicator light is faulty, and further it is determined that there is a defect in the internal circuit of the distribution automation terminal associated with the indicator light, and the determined internal circuit is the defect position in the distribution automation terminal.

[0041] In addition, after determining the defect position, it can be displayed through an external display screen, or a display screen can be set in the measurement and control host 10 and displayed on this display screen, so that the user can accurately know the defect position, perform detection and confirmation, and perform repair after confirmation is correct, thereby improving the defect repair efficiency.

[0042] The defect location device applicable to the distribution terminal in this embodiment includes: a measurement and control host, a relay, and a plurality of indicator lights; the measurement and control host is respectively connected to the relay and each indicator light, and the measurement and control host is also connected to the distribution automation terminal through an aviation adapter. In this embodiment, the measurement and control host determines the switch position of the relay or the distribution automation terminal; the measurement and control host determines the operating states of each indicator light, and the operating states of each indicator light are associated with the switch position and the internal circuit of the distribution automation terminal; the measurement and control host determines the defect position in the distribution automation terminal according to the switch position and the operating states of each indicator light. Since the operating states of each indicator light adopted in this embodiment are associated with the switch position and the internal circuit of the distribution automation terminal, and the defect position in the distribution automation terminal is determined by the measurement and control host in combination with the switch position of the relay and the operating states of the indicator lights, therefore, compared with the prior art, this embodiment can realize automatic defect location, without looking for the manufacturer, effectively simplifies the process, and improves the defect location efficiency.

[0043] Based on the first embodiment of the present application, the second embodiment of the present application is proposed. In the second embodiment of the present application, the same or similar content as that in the above first embodiment can be referred to the above introduction and may not be repeated. On this basis, please refer to Figure 2 , Figure 2 which is the structural schematic diagram of the second embodiment of the defect location device applicable to the distribution terminal of the present application.

[0044] In this embodiment, the distribution automation terminal is the pole-mounted switch 31, and the indicator lights at least include a closing indicator light 41 and a tripping indicator light 42.

[0045] Both the closing indicator light 41 and the tripping indicator light 42 are connected to the measurement and control host 10.

[0046] It should be noted that the above-mentioned closing indicator light 41 and the above-mentioned opening indicator light 42 are both indicator lights participating in the defect location of the internal circuit of the pole-mounted switch 31, and both can be used as the switch-side indicator lights described in the above embodiments.

[0047] The measurement and control host 10 is further configured to determine the switch position of the pole-mounted switch 31.

[0048] In a specific implementation, the above-mentioned measurement and control host 10 can determine the switch position of the pole-mounted switch 31 through a corresponding position sensor.

[0049] The measurement and control host 10 is further configured to determine the operating status of the closing indicator light 41 and the operating status of the opening indicator light 42. The closing indicator light 41 and the opening indicator light 42 are both driven by the internal circuit of the pole-mounted switch 31 based on the switch position of the pole-mounted switch 31.

[0050] The measurement and control host 10 is further configured to determine the defect position of the pole-mounted switch 31 according to the switch position of the pole-mounted switch 31, the operating status of the closing indicator light 41, and the operating status of the opening indicator light 42.

[0051] In a specific implementation, the closing indicator light 41 and the opening indicator light 42 can be driven by the internal circuit of the pole-mounted switch 31 based on the switch position of the pole-mounted switch 31. That is, when there is no defect in the internal circuit of the pole-mounted switch 31, the switch position of the pole-mounted switch 31 can control whether the above-mentioned closing indicator light 41 and the above-mentioned opening indicator light 42 are connected to the internal circuit of the pole-mounted switch 31. When the internal circuit of the pole-mounted switch 31 is in a normal state, the operating status of the closing indicator light 41 and the opening indicator light 42 at different switch positions of the pole-mounted switch 31 can be determined in advance by the staff. When the measurement and control host 10 performs defect location on the pole-mounted switch 31, it can determine the operating status of the closing indicator light 41 and the opening indicator light 42 at the current switch position of the pole-mounted switch 31, and compare it with the previously determined operating status at the same switch position. When the operating status of any indicator light is detected to be inconsistent with the previously determined operating status at the same switch position, it is determined that the indicator light is incorrect, and then it is determined that there is a defect in the internal circuit of the pole-mounted switch 31 associated with the indicator light. The determined internal circuit is the defect position in the pole-mounted switch 31.

[0052] It should be understood that the above-mentioned closing indicator light 41 and the opening indicator light 42 can be connected to different internal circuits of the pole-mounted switch 31. When the closing indicator light 41 is incorrect, it can be determined that there is a defect in the internal circuit to which the closing indicator light is connected. When the opening indicator light 42 is incorrect, it can be determined that there is a defect in the internal circuit to which the opening indicator light is connected, thereby improving the defect location accuracy of the pole-mounted switch 31.

[0053] Further, the internal circuit of the pole-mounted switch 31 at least includes: a closing control circuit.

[0054] It should be noted that the above-mentioned closing control circuit can be a circuit for controlling the switch position of the pole-mounted switch 31 to switch from the off position to the on position.

[0055] The measurement and control host 10 is further configured to determine whether the closing indicator light 41 is lit when the switch position of the pole-mounted switch 31 is in the off position, and the closing indicator light 41 is driven by the closing control circuit when the pole-mounted switch 31 is in the off position.

[0056] In a specific implementation, after the measurement and control host 10 is connected to the pole-mounted switch 31 through an aviation adapter, the boost circuit inside the measurement and control host 10 can boost the battery to obtain a high-level signal. For example, the initial battery voltage is 3V, and the voltage of the high-level signal obtained after boosting is 24V. This high-level signal is output to the inside of the pole-mounted switch 31 through the closing / opening pins HZ+ / FZ+ in the aviation adapter, and flows out to the measurement and control host 10 through the closing / opening pins HZ- / FZ- to form an internal circuit on the first switch side. The above-mentioned closing indicator light 41 is arranged in this internal circuit on the first switch side, and the above-mentioned high-level signal is pulled to a low level after passing through the closing indicator light 41 and another current-limiting resistor. When the switch position of the pole-mounted switch 31 is in the off position, if the closing control circuit is not broken, the closing indicator light 41 receives the high-level signal and lights up. If the closing control circuit is broken, the closing indicator light 41 does not receive the high-level signal and does not light up.

[0057] The measurement and control host 10 is further configured to determine that there is a break defect in the closing control circuit in the pole-mounted switch 31 when the closing indicator light 41 is not lit.

[0058] In a specific implementation, the measurement and control host 10 can determine whether there is a break defect in the closing control circuit in the pole-mounted switch 31 by detecting whether the closing indicator light 41 is lit, that is, when the closing indicator light 41 is lit, it is determined that there is no break defect in the closing control circuit, and when the closing indicator light 41 is not lit, it is determined that there is a break defect in the closing control circuit.

[0059] Further, the internal circuit of the pole-mounted switch 31 further includes: a tripping control circuit.

[0060] It should be noted that the above-mentioned tripping control circuit can be a circuit for controlling the switch position of the pole-mounted switch 31 to switch from the on position to the off position.

[0061] The measurement and control host 10 is further configured to determine whether the opening indicator light 42 is lit when the switch position of the pole-mounted switch 31 is in the closed position, and the opening indicator light 42 is driven by the opening control circuit when the pole-mounted switch 31 is in the closed position.

[0062] In a specific implementation, the above-mentioned opening indicator light 42 is also arranged in the above-mentioned internal circuit on the first switch side, and the above-mentioned high-level signal is pulled to a low level after passing through the opening indicator light 42 and the current-limiting resistor. When the switch position of the pole-mounted switch 31 is in the closed position, if there is no disconnection in the opening control circuit, the opening indicator light 42 receives a high-level signal and lights up. If the opening control circuit is disconnected, the opening indicator light 42 does not receive a high-level signal and does not light up.

[0063] The measurement and control host 10 is further configured to determine that there is a disconnection defect in the opening control circuit of the pole-mounted switch 31 when the opening indicator light 42 is not lit.

[0064] In a specific implementation, the measurement and control host 10 can determine whether there is a disconnection defect in the opening control circuit of the pole-mounted switch 31 by detecting whether the opening indicator light 42 is lit, that is, when the opening indicator light 42 is lit, it is determined that there is no disconnection defect in the opening control circuit, and when the opening indicator light 42 is not lit, it is determined that there is a disconnection defect in the opening control circuit. Based on the above-mentioned closing indicator light 41 and opening indicator light 42, precise positioning of the defects of the pole-mounted switch 31 can be realized, effectively improving the positioning accuracy.

[0065] It should be understood that, in order to improve the detection accuracy, the lighting colors of the closing indicator light 41 and the opening indicator light 42 can be set differently. For example, the lighting color of the closing indicator light 41 can be set to red, that is, when the closing indicator light 41 is lit, it lights up red; the lighting color of the opening indicator light 42 can be set to green, that is, when the opening indicator light 42 is lit, it lights up green.

[0066] In a feasible implementation manner, the indicator lights further include a switch-side off-position indicator light 43 and a switch-side on-position indicator light 44.

[0067] Both the switch-side off-position indicator light 43 and the switch-side on-position indicator light 44 are connected to the measurement and control host 10.

[0068] It should be noted that the above-mentioned switch-side off-position indicator light 43 and switch-side on-position indicator light 44 can be indicator lights for determining the switch position of the pole-mounted switch 31.

[0069] The measurement and control host 10 is further configured to determine the operating state of the switch-side off-position indicator light 43 and the operating state of the switch-side on-position indicator light 44.

[0070] The measurement and control host 10 is further configured to determine that the pole-mounted switch 31 is in the off position when the off-position indicator light 43 on the switch side is lit and the on-position indicator light 44 on the switch side is not lit.

[0071] The measurement and control host 10 is further configured to determine that the pole-mounted switch 31 is in the on position when the off-position indicator light 43 on the switch side is not lit and the on-position indicator light 44 on the switch side is lit.

[0072] The measurement and control host 10 is further configured to determine that there is a defect in the switch position of the pole-mounted switch 31 when the operating states of the off-position indicator light 43 on the switch side and the on-position indicator light 44 on the switch side are the same.

[0073] In a specific implementation, during the process of monitoring the disconnection defect of the closing control loop and the opening control loop of the pole-mounted switch 31, the above high-level signal is output to the inside of the pole-mounted switch 31 through the pin YXCOM+ of the aviation plug telemetry signal common terminal, and flows out to the measurement and control host 10 through the aviation plug on / off position and energy storage pins HW- / FW- / WCN- to form a second internal loop on the switch side. The off-position indicator light 43 on the switch side and the on-position indicator light 44 on the switch side are arranged in the second internal loop on the switch side, and the above high-level signal is pulled to a low level through the off-position indicator light 43 on the switch side, the on-position indicator light 44 on the switch side and the current-limiting resistor. When the pole-mounted switch 31 is in the off position and storing energy, the off-position node inside the pole-mounted switch 31 is conducted, the off-position indicator light 43 on the switch side detects the high-level signal and is lit, and the on-position indicator light 44 on the switch side does not detect the high-level signal and is not lit; when the pole-mounted switch 31 is in the on position and not storing energy, the on-position node inside the pole-mounted switch 31 is conducted, the off-position indicator light 43 on the switch side does not detect the high-level signal and is not lit, and the on-position indicator light 44 on the switch side detects the high-level signal and is lit.

[0074] Based on this, in order to determine the switch position of the pole-mounted switch 31, the measurement and control host 10 may first determine the operating states of the off-position indicator light 43 on the switch side and the on-position indicator light 44 on the switch side. When the off-position indicator light 43 on the switch side is lit and the on-position indicator light 44 on the switch side is not lit, it is determined that the pole-mounted switch is in the off position; when the off-position indicator light 43 on the switch side is not lit and the on-position indicator light 44 on the switch side is lit, it is determined that the pole-mounted switch is in the on position.

[0075] It should be understood that in order to improve the detection accuracy, the lighting colors of the off-position indicator light 43 on the switch side and the on-position indicator light 44 on the switch side can be set differently. For example, the lighting color of the off-position indicator light 43 on the switch side can be set to green, that is, when the off-position indicator light 43 on the switch side is lit, it lights up green; the lighting color of the on-position indicator light 44 on the switch side can be set to red, that is, when the on-position indicator light 44 on the switch side is lit, it lights up red. On this basis, when there is no defect in the switch position of the pole-mounted switch, the lighting colors of the off-position indicator light 43 on the switch side and the on-position indicator light 44 on the switch side are different. The above-mentioned measurement and control host 10 can detect in real time whether the operating states of the off-position indicator light 43 on the switch side and the on-position indicator light 44 on the switch side are consistent, that is, whether they are lit or not lit at the same time. When they are lit or not lit at the same time, it is determined that there is a defect in the switch position of the pole-mounted switch 31.

[0076] It should be noted that compared with using a position sensor to determine the switch position of the pole-mounted switch 31, determining the switch position of the pole-mounted switch 31 by the lighting colors of the above-mentioned off-position indicator light 43 on the switch side and the above-mentioned on-position indicator light 44 on the switch side effectively improves the determination accuracy of the switch position, and can also detect defects in the switch position of the pole-mounted switch 31, further improving the defect detection accuracy.

[0077] In this embodiment, the defect positioning device further includes: a display module 50.

[0078] The display module 50 is connected to the measurement and control host 10.

[0079] The measurement and control host 10 is further configured to sample the internal current of the pole-mounted switch 31 to obtain a current sampling value.

[0080] In a specific implementation, during the process of defect positioning of the pole-mounted switch 31, switch current sampling detection can also be performed. The above-mentioned measurement and control host 10 can collect three-phase currents through current sampling pins, and can filter and power-amplify the three-phase currents to obtain a current sampling value.

[0081] The measurement and control host 10 is further configured to determine whether the current sampling value is within a preset current range.

[0082] It should be noted that the above-mentioned preset current range can be a range for determining whether the current sampling value is abnormal.

[0083] In a specific implementation, the above-mentioned measurement and control host 10 can determine whether the current sampling value is within a preset current range to determine whether there is an abnormality in the internal current of the pole-mounted switch 31.

[0084] The measurement and control host 10 is further configured to generate first display data indicating that there is no abnormality in the internal current of the pole-mounted switch 31 when the current sampling value is within the preset current range.

[0085] The measurement and control host 10 is further configured to generate second display data indicating that there is an abnormality in the internal current of the pole-mounted switch 31 when the current sampling value is not within the preset current range.

[0086] The measurement and control host 10 is further configured to display the first display data or the second display data on the display module 50.

[0087] In a specific implementation, when the current sampling value is within the preset current range, the measurement and control host 10 determines that there is no abnormality in the internal current of the pole-mounted switch 31, and can generate first display data indicating that there is no abnormality in the internal current of the pole-mounted switch 31, and display the first display data on the display module 50. For example, the display content of the first display data on the display module 50 may be "The three-phase current data is relatively balanced". When the current sampling value is not within the preset current range, the measurement and control host determines that there is an abnormality in the internal current of the pole-mounted switch 31, and can generate second display data indicating that there is an abnormality in the internal current of the pole-mounted switch 31, and display the second display data on the display module 50. For example, the display content of the second display data on the display module 50 may be "The three-phase current data is unbalanced or a phase is missing".

[0088] In addition, the measurement and control host 10 can also display the defect detection result of the pole-mounted switch on the display module 50, so that the user can know the operating state of the pole-mounted switch 31 through the display module 50, improving the user experience.

[0089] Exemplarily, for ease of understanding, reference is made to Figure 3 for description, but the present solution is not limited thereto. Figure 3 It is a schematic flowchart of the brief process of the second embodiment of the present application. Figure 3In this example, the closing indicator light 41 being lit is regarded as the red light, the opening indicator light 42 being lit is regarded as the green light, the off-position indicator light 43 on the switch side being lit is regarded as the green light, and the on-position indicator light 44 on the switch side being lit is regarded as the red light. During the process of the defect location device performing defect location on the pole-mounted switch 31, it includes control loop open-circuit detection (i.e., off-control loop and on-control loop open-circuit detection), switch position detection (i.e., position detection of the pole-mounted switch 31), and switch current detection. For control loop open-circuit detection, when the control loop is not open-circuited, if the switch is in the off position, the closing indicator light 41 lights up red; if the switch is in the on position, the opening indicator light 42 lights up green. If the control loop is open-circuited, that is, both the off-control loop and the on-control loop are open-circuited, then both the closing indicator light 41 and the opening indicator light 42 do not light up. For switch position detection, when the position is normal, if the red light is on (i.e., the on-position indicator light 44 on the switch side is lit), it is determined that the switch is in the on position; if the green light is on (i.e., the off-position indicator light 43 on the switch side is lit), the switch is in the off position; when the position is not normal, if the red and green lights are on or off simultaneously (i.e., the operating states of the on-position indicator light 44 and the off-position indicator light 43 on the switch side are the same), then the switch has a double-position error. For switch current detection, it is detected whether the detected value is normal (i.e., whether the current sampling value exceeds the preset current range). If it is normal, the three-phase current data can be displayed as relatively balanced. If it is abnormal, the three-phase current data can be displayed as unbalanced or with a phase missing.

[0090] Based on the first embodiment and the second embodiment of the present application, the third embodiment of the present application is proposed. In the third embodiment of the present application, for the content that is the same as or similar to the above first embodiment and second embodiment, reference can be made to the above introduction and will not be elaborated hereinafter. On this basis, please refer to Figure 4 , Figure 4 which is a schematic structural diagram of the third embodiment of the defect location device applicable to the distribution terminal of the present application.

[0091] In this embodiment, the distribution automation terminal is the distribution terminal 32. The indicator lights further include an on-position indicator light 45 on the terminal side and an off-position indicator light 46 on the terminal side. The internal loop of the distribution terminal at least includes a control loop on the terminal side.

[0092] Both the on-position indicator light 45 on the terminal side and the off-position indicator light 46 on the terminal side are connected to the measurement and control host 10.

[0093] It should be noted that both the on-position indicator light 45 on the terminal side and the off-position indicator light 46 on the terminal side are indicator lights participating in the defect location of the internal loop of the distribution terminal 32, and both can be used as the indicator lights on the terminal side described in the above embodiments.

[0094] It can be understood that the above control loop on the terminal side can be a loop for controlling the switch position of the pole-mounted switch 31.

[0095] The measurement and control host 10 is further configured to determine the switch position of the relay 20.

[0096] In a specific implementation, the above-mentioned measurement and control host 10 can determine the switch position of the pole-mounted switch 31 through a corresponding position sensor.

[0097] The measurement and control host 10 is further configured to determine the operating status of the terminal-side closing position indicator 45 and the operating status of the terminal-side opening position indicator 46. Both the terminal-side closing position indicator 45 and the terminal-side opening position indicator 46 are driven by the power distribution terminal 32 based on the switch position of the relay 20.

[0098] The measurement and control host 10 is further configured to determine the defect position of the power distribution terminal 32 according to the switch position of the relay 20, the operating status of the terminal-side closing position indicator 45, and the operating status of the terminal-side opening position indicator 46.

[0099] In a specific implementation, the terminal-side closing position indicator 45 and the terminal-side opening position indicator 46 can be driven by the terminal-side control circuit of the power distribution terminal 32 based on the switch position of the relay 20. That is, when there is no defect in the terminal-side control circuit of the power distribution terminal 32, the switch position of the relay 20 can control whether the terminal-side closing position indicator 45 and the terminal-side opening position indicator 46 are connected to the terminal-side control circuit of the power distribution terminal 32. When the terminal-side control circuit of the power distribution terminal 32 is in a normal state, the operating status of the terminal-side closing position indicator 45 and the terminal-side opening position indicator 46 under different switch positions of the relay 20 can be determined in advance by the staff. When the measurement and control host 10 performs defect location on the power distribution terminal 32, it can determine the operating status of the terminal-side closing position indicator 45 and the terminal-side opening position indicator 46 under the current switch position of the relay 20, and compare it with the previously determined operating status under the same switch position. When the operating status of any indicator is detected to be inconsistent with the previously determined operating status under the same switch position, it is determined that the indicator is incorrect, and then it is determined that there is a defect in the terminal-side control circuit. The determined terminal-side control circuit is the defect position in the power distribution terminal 32.

[0100] Further, the measurement and control host 10 is further configured to determine that there is a breakage defect in the terminal-side control circuit of the power distribution terminal 32 when the switch position of the relay 20 is in the opening position, the terminal-side closing position indicator 45 is not lit, and the terminal-side opening position indicator 46 is lit.

[0101] The measurement and control host 10 is further configured to determine that there is a breakage defect in the terminal-side control circuit of the power distribution terminal 32 when the switch position of the relay 20 is in the closing position, the terminal-side closing position indicator 45 is lit, and the terminal-side opening position indicator 46 is not lit.

[0102] In a specific implementation, after the measurement and control host 10 and the power distribution terminal 32 are connected through an aviation adapter, the boost circuit inside the measurement and control host 10 can boost the battery to obtain a high-level signal. For example, if the initial battery voltage is 3V, the voltage of the high-level signal obtained after boosting is 24V.

[0103] Further, after the terminal-side control circuit of the power distribution terminal 32 receives the high-level signal, it can remotely control the relay 20 through the FZ+ / HZ+ / YKCOM / FW+ / HW+ / YXCOM pins. When the terminal-side control circuit is not broken, if the switch position of the relay 20 is in the off position, the power distribution terminal 32 performs a remote closing operation. After the operation, the terminal-side closing indicator light 45 receives the high-level signal and lights up, and the terminal-side opening indicator light 46 does not receive the high-level signal and does not light up; if the switch position of the relay 20 is in the on position, the power distribution terminal 32 performs a remote opening operation. After the operation, the terminal-side opening indicator light 46 lights up, and the terminal-side closing indicator light 45 does not light up. Based on this, the above-mentioned measurement and control host 10 can determine that there is no breakage defect in the terminal-side control circuit when the switch position of the relay 20 is in the off position, the terminal-side closing indicator light 45 is lit, and the terminal-side opening indicator light 46 is not lit; when the switch position of the relay 20 is in the off position, the terminal-side closing indicator light 45 is not lit, and the terminal-side opening indicator light 46 is lit, it is determined that there is a breakage defect in the terminal-side control circuit; when the switch position of the relay 20 is in the on position, the terminal-side closing indicator light 45 is not lit, and the terminal-side opening indicator light 46 is lit, it is determined that there is no breakage defect in the terminal-side control circuit; when the switch position of the relay 20 is in the on position, the terminal-side closing indicator light 45 is lit, and the terminal-side opening indicator light 46 is not lit, it is determined that there is a breakage defect in the terminal-side control circuit, thus realizing the precise positioning of the defects of the power distribution terminal 32 and effectively improving the positioning accuracy.

[0104] It should be understood that to improve the detection accuracy, the lighting colors of the terminal-side closing indicator light 45 and the terminal-side opening indicator light 46 can be set differently. For example, the lighting color of the terminal-side closing indicator light 45 can be set to red, that is, when the terminal-side closing indicator light 45 is lit, it lights up red; the lighting color of the terminal-side opening indicator light 46 can be set to green, that is, when the terminal-side opening indicator light 46 is lit, it lights up green.

[0105] In this embodiment, the defect positioning device further includes: a tripping trigger button 61 and a closing trigger button 62.

[0106] The tripping trigger button 61 and the closing trigger button 62 are respectively connected to the measurement and control host 10.

[0107] The measurement and control host 10 is further configured to control the switch position of the relay 20 to switch to the off position when receiving the off-position drive signal triggered by the tripping trigger button 61.

[0108] The measurement and control host 10 is further configured to control the switch position of the relay 20 to the closed position when receiving the closing drive signal triggered by the closing trigger button 62.

[0109] It should be noted that the above-mentioned opening trigger button 61 can be a button for controlling the switch position of the relay 20 to the open position. The above-mentioned closing trigger button 62 can be a button for controlling the switch position of the relay 20 to the closed position.

[0110] In a specific implementation, the user can trigger the open drive signal by pressing the opening trigger button 61. When the measurement and control host detects the open drive signal, it can switch the switch position of the relay 20 to the open position; correspondingly, the user can also trigger the closing drive signal by pressing the closing trigger button 62. When the measurement and control host detects the closing drive signal, it can switch the switch position of the relay 20 to the closed position, thereby realizing accurate control of the switch position of the relay 20.

[0111] Exemplarily, for the sake of easy understanding, refer to Figure 5 , Figure 5 which is the front view of the measurement and control host in the third embodiment of the present application. Figure 5 In, the measurement and control host 10 is provided with an indicator light 40, a display module 50, a button 60, a power start switch 71, a 26-core aviation socket 72, a handle 73, a TPYE-C charging port 74, a banana socket 75, and a grounding socket 76. Refer to Figure 6 , Figure 6 which is the internal schematic diagram of the measurement and control host in the third embodiment of the present application. Figure 6 In, the interior of the measurement and control host 10 includes a battery 81, a housing 82, and an internal circuit on the host side 83.

[0112] Among them, the above-mentioned indicator light 40 includes but is not limited to a closing indicator light 41, an opening indicator light 42, a switch-side open position indicator light 43, a switch-side closed position indicator light 44, a terminal-side closed position indicator light 45, and a terminal-side open position indicator light 46. The above-mentioned button 60 includes but is not limited to an opening trigger button 61 and a closing trigger button 62.

[0113] It should be noted that the power start switch 71 is embedded in the panel of the housing 82 and connected to the display module 50 to control the power supply of the display module 50. The display module 50 is connected to the internal circuit on the host side and can display the current amplitude and the waveform of the load-carrying capacity of the backup power supply. The 26-core aviation socket 72 is installed on the left side of the device housing 82 and connected to the aviation adapter, mainly for data output or acquisition. The handle 73 is installed directly above the housing 82 to facilitate carrying the measurement and control host 10. The TPYE-C charging port 74 is respectively connected to the internal circuit 83 on the host side and the battery 81 for charging the battery 81. The banana socket 75 is connected to the reclosing detection circuit in the internal circuit 83 on the host side. Four banana sockets 75 can be set, namely the relay protection instrument IA-in, IN-in and the terminal current IA-out, IN-out. The grounding socket 76 is connected to the housing 82, mainly for the safety grounding of the entire device. The battery 81 is respectively connected to the TPYE-C charging port 74 and the internal circuit 83 on the host side to realize battery charging and discharging and internal circuit power supply. The housing 82 is a metal box, which is the main structure of the device and realizes the connection with each part. The internal circuit 83 on the host side is installed inside the measurement and control host 10 and mainly performs the defect location operation described above. Figure 5 and Figure 6 The structure shown is for illustrative purposes only and does not limit the present solution.

[0114] Based on the defect location device described in the above embodiments, the present application also proposes a defect location method. Refer to Figure 7 , Figure 7 which is a schematic flow chart of the defect location method applicable to the distribution terminal in the present application. The defect location method includes steps S10 to S30: Step S10, determine the switch position of the relay or the distribution automation terminal.

[0115] Step S20, determine the operating states of the respective indicator lights. The operating states of the respective indicator lights are associated with the switch position and the internal circuit of the distribution automation terminal.

[0116] Step S30, determine the defect position in the distribution automation terminal according to the switch position and the operating states of the respective indicator lights.

[0117] For the defect location method provided by the present application, the execution subject can be the measurement and control host 10 in the defect location device, and is consistent with the operations performed by the measurement and control host 10 in the above-mentioned defect location device embodiment, and can solve the technical problems of complex existing technical processes and low location efficiency. Compared with the prior art, the beneficial effects of the defect location method provided by the present application are the same as those of the defect location device provided in the above embodiment, and other technical features in the defect location method are the same as the features disclosed in the above-mentioned defect location device embodiment, and will not be elaborated here.

[0118] The above are only some embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A defect location device applicable to a distribution terminal, characterized in that The defect location device includes: a measurement and control host, a relay, and multiple indicator lights; The measurement and control host is respectively connected to the relay and each of the indicator lights, and the measurement and control host is also connected to the distribution automation terminal through an aviation adapter; The measurement and control host is used to determine the switch position of the relay or the distribution automation terminal; The measurement and control host is also used to determine the operating status of each of the indicator lights, and the operating status of each of the indicator lights is associated with the switch position and the internal circuit of the distribution automation terminal; The measurement and control host is also used to determine the defect position in the distribution automation terminal according to the switch position and the operating status of each of the indicator lights.

2. The defect location device applicable to a distribution terminal as described in claim 1, characterized in that, The distribution automation terminal is a pole-mounted switch, and the indicator lights at least include a closing indicator light and a tripping indicator light; Both the closing indicator light and the tripping indicator light are connected to the measurement and control host; The measurement and control host is also used to determine the switch position of the pole-mounted switch; The measurement and control host is also used to determine the operating status of the closing indicator light and the operating status of the tripping indicator light. Both the closing indicator light and the tripping indicator light are driven by the internal circuit of the pole-mounted switch based on the switch position of the pole-mounted switch; The measurement and control host is also used to determine the defect position of the pole-mounted switch according to the switch position of the pole-mounted switch, the operating status of the closing indicator light, and the operating status of the tripping indicator light.

3. The defect location device applicable to a distribution terminal according to claim 2, characterized in that, The internal circuit of the pole-mounted switch at least includes: a closing control circuit; The measurement and control host is also used to judge whether the closing indicator light is on when the switch position of the pole-mounted switch is in the off position. The closing indicator light is driven by the closing control circuit when the pole-mounted switch is in the off position; The measurement and control host is also used to determine that there is a break defect in the closing control circuit in the pole-mounted switch when the closing indicator light is not on.

4. The defect location device applicable to a distribution terminal according to claim 2, characterized in that, The internal circuit of the pole-mounted switch further includes: a tripping control circuit; The measurement and control host is also used to judge whether the tripping indicator light is on when the switch position of the pole-mounted switch is in the on position. The tripping indicator light is driven by the tripping control circuit when the pole-mounted switch is in the on position; The measurement and control host is also used to determine that there is a break defect in the tripping control circuit in the pole-mounted switch when the tripping indicator light is not on.

5. The defect location device applicable to a power distribution terminal according to claim 2, characterized in that, The indicator lights further include a switch-side off-position indicator light and a switch-side on-position indicator light; Both the switch-side off-position indicator light and the switch-side on-position indicator light are connected to the measurement and control host; The measurement and control host is also used to determine the operating status of the switch-side off-position indicator light and the operating status of the switch-side on-position indicator light; The measurement and control host is also used to determine that the pole-mounted switch is in the off position when the switch-side off-position indicator light is on and the switch-side on-position indicator light is not on; The measurement and control host is also used to determine that the pole-mounted switch is in the on position when the switch-side off-position indicator light is not on and the switch-side on-position indicator light is on; The measurement and control host is further configured to determine that there is a defect in the switch position of the pole-mounted switch when the operating states of the switch-side open position indicator and the switch-side closed position indicator are consistent.

6. The defect location device applicable to a distribution terminal according to any one of claims 2 to 5, characterized in that, The defect location device further includes: a display module; The display module is connected to the measurement and control host; The measurement and control host is further configured to sample the internal current of the pole-mounted switch to obtain a current sampling value; The measurement and control host is further configured to determine whether the current sampling value is within a preset current range; The measurement and control host is further configured to generate first display data indicating that there is no abnormality in the internal current of the pole-mounted switch when the current sampling value is within the preset current range; The measurement and control host is further configured to generate second display data indicating that there is an abnormality in the internal current of the pole-mounted switch when the current sampling value is not within the preset current range; The measurement and control host is further configured to display the first display data or the second display data on the display module.

7. The defect location device applicable to a distribution terminal according to claim 1, characterized in that, The distribution automation terminal is a distribution terminal, and the indicator further includes a terminal-side closed position indicator and a terminal-side open position indicator. The internal circuit of the distribution terminal at least includes a terminal-side control circuit; Both the terminal-side closed position indicator and the terminal-side open position indicator are connected to the measurement and control host; The measurement and control host is further configured to determine the switch position of the relay; The measurement and control host is further configured to determine the operating states of the terminal-side closed position indicator and the terminal-side open position indicator. Both the terminal-side closed position indicator and the terminal-side open position indicator are driven by the distribution terminal based on the switch position of the relay; The measurement and control host is further configured to determine the defect location of the distribution terminal according to the switch position of the relay, the operating state of the terminal-side closed position indicator, and the operating state of the terminal-side open position indicator.

8. The defect location device applicable to a distribution terminal according to claim 7, characterized in that, The measurement and control host is further configured to determine that there is a break defect in the terminal-side control circuit of the distribution terminal when the switch position of the relay is in the open position, the terminal-side closed position indicator is not lit, and the terminal-side open position indicator is lit; The measurement and control host is further configured to determine that there is a break defect in the terminal-side control circuit of the distribution terminal when the switch position of the relay is in the closed position, the terminal-side closed position indicator is lit, and the terminal-side open position indicator is not lit.

9. The defect location device applicable to a distribution terminal according to claim 7, characterized in that, The defect location device further includes: a tripping trigger button and a closing trigger button; The tripping trigger button and the closing trigger button are respectively connected to the measurement and control host; The measurement and control host is further configured to control the switch position of the relay to switch to the open position when receiving a tripping drive signal triggered by the tripping trigger button; The measurement and control host is further configured to control the switch position of the relay to switch to the closed position when receiving a closing drive signal triggered by the closing trigger button.

10. A defect location method applicable to a distribution terminal of the defect location device applicable to a distribution terminal according to any one of claims 1 to 9, characterized in that, The defect location method applicable to a distribution terminal includes the following steps: Determine the switch position of the relay or the distribution automation terminal; Determine the operating status of each indicator light, and the operating status of each indicator light is associated with the switch position and the internal circuit of the distribution automation terminal; Determine the defect location in the distribution automation terminal according to the switch position and the operating status of each indicator light.

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