A system for confirming the operating conditions of a disconnect switch and diagnosing circuit faults.

Abstract

This invention discloses a system for confirming the operating conditions of a disconnect switch and diagnosing circuit faults, comprising: a voltage acquisition device and an intelligent operation and maintenance platform; the voltage acquisition device is embedded in the disconnect switch terminal box and mechanism box, and terminal block probes are inserted into the terminals to be tested in the terminal blocks of the disconnect switch terminal box and mechanism box; the input end of the voltage acquisition device is connected to the terminal block probes; the voltage acquisition device is used to acquire the node voltage of each terminal to be tested in the terminal block; the intelligent operation and maintenance platform is communicatively connected to the disconnect switch control circuit and the voltage acquisition device, and is used to send remote control signals for opening and closing the disconnect switch to the disconnect switch control circuit; it receives the node voltage of the terminal to be tested acquired by the voltage acquisition device; in response to a disconnect switch mode request, it determines whether the deviation of the node voltage of each terminal to be tested from the normal voltage meets a preset deviation threshold; if it does not meet the threshold, it determines that the terminal to be tested has a disconnect switch operating condition failure or a circuit fault problem, and generates a disconnect switch fault report, thereby realizing automated diagnosis of the cause of disconnect switch failure to operate.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a system for confirming the operating conditions of a disconnector and diagnosing circuit faults. Background Technology

[0002] Disconnectors are key devices for adjusting the operation mode of power systems, and their control and motor circuits are the core components for opening and closing. During switching operations, failure to operate due to unmet operating conditions or control circuit malfunctions is a common occurrence. Common issues include discrepancies between the "remote / local" operating conditions and the actual operating conditions, the secondary circuit power supply circuit breaker not being engaged, electrical five-proof interlocking, and loose or broken wire connections. Maintenance personnel must spend a significant amount of time diagnosing and restoring the cause of the failure to operate, severely reducing operational efficiency and directly impacting the reliability of the power supply system.

[0003] Therefore, there is an urgent need to develop a system for confirming the operating conditions of a disconnector and diagnosing circuit faults, so as to automate the diagnosis of the reasons for the disconnector's failure to operate. Summary of the Invention

[0004] This invention provides a system for confirming the operating conditions of a disconnector and diagnosing circuit faults, which solves the technical problem that existing technologies struggle to automate the diagnosis of disconnector failure to operate.

[0005] The present invention provides a disconnector operation condition confirmation and circuit fault diagnosis system, comprising: a voltage acquisition device and an intelligent operation and maintenance platform;

[0006] The voltage acquisition device is embedded in the disconnector terminal box and the mechanism box. Terminal probes are inserted into the terminals to be tested in the terminal blocks of the disconnector terminal box and the mechanism box. The input terminal of the voltage acquisition device is connected to the terminal probes. The voltage acquisition device is used to acquire the node voltage of each terminal to be tested in the terminal block.

[0007] The intelligent operation and maintenance platform is communicatively connected to the disconnector control circuit and the voltage acquisition device, respectively, and is used to send remote control signals for opening and closing the disconnector to the disconnector control circuit; receive the node voltage of the terminal under test collected by the voltage acquisition device; and, in response to the disconnector mode request, determine whether the deviation of the node voltage of each terminal under test from the normal voltage meets the preset deviation threshold. If it does not meet the threshold, it is determined that the terminal under test has a disconnector operation condition failure or circuit fault problem, and a disconnector fault report is generated.

[0008] Furthermore, the terminal block probe includes one or more monolithic probe structures;

[0009] The single-piece detection structure includes a fixing screw, a wire, a metal sheet, upper and lower telescopic pins, and a T-shaped fixing insulating base;

[0010] The fixing screws are used to fix the connecting wire, the metal plate and the T-shaped fixing insulating base in sequence;

[0011] The metal sheet has upper and lower telescopic pins on both sides, and the upper and lower telescopic pins pass through the T-shaped fixed insulating base and the terminal to be tested.

[0012] Furthermore, one end of the wire has a circular ring structure, through which the fixing screw passes and is connected to the metal sheet and the fixing screw by spot welding.

[0013] Furthermore, the T-shaped fixed insulating base includes a transverse fixing part and upper and lower guide columns;

[0014] Both sides of the transverse fixing part are provided with assembly guide fixing holes;

[0015] The upper and lower guide columns are equipped with multi-stage buckles that are adapted to the body structure of the terminal under test.

[0016] Furthermore, the voltage acquisition device includes a transformer isolation module, an ADC data acquisition module, a processor, and a remote data transmission module.

[0017] Furthermore, the intelligent operation and maintenance platform includes a server and a client connected via communication.

[0018] The server is connected to the voltage acquisition device via a smart gateway.

[0019] The client is connected to the monitoring and control panel via an Ethernet switch, and the monitoring and control panel is communicatively connected to the disconnector control circuit.

[0020] Furthermore, the server and the voltage acquisition device communicate with each other based on the Modbus transmission protocol.

[0021] Furthermore, the server is used for,

[0022] Store the number of each terminal under test and its corresponding normal status data under different disconnector modes; receive the node voltage of the terminal under test collected by the voltage acquisition device; wherein, the normal status data includes the normal voltage of the terminal under test and the status of the normally operating components.

[0023] Determine whether the received node voltage of the terminal under test is related to the control terminal that starts the motor rotation;

[0024] If not associated, in response to the request of the disconnector mode, the deviation between the node voltage of the terminal under test and the normal voltage in the associated disconnector mode is judged in real time. If the deviation is greater than the preset deviation threshold, it is confirmed that the terminal under test has a disconnector operation condition not met or a circuit fault problem.

[0025] If associated, the associated terminal voltage under test is stored in real time. In response to the disconnector mode request, it is determined whether the stored terminal voltage under test meets the trigger condition and whether the deviation between the terminal voltage under test and the normal voltage in the associated disconnector mode meets the preset deviation threshold. If not, it is determined that there is a loop fault problem in the terminal under test.

[0026] The relevant information of the problematic terminal under test is sent to the client.

[0027] Furthermore, the server is specifically used to, if associated, store the node voltage of the associated terminal under test in a preset first storage space for a preset first duration and cyclically overwrite, while extracting and calculating the first effective voltage value of the node voltage from the first storage space.

[0028] In response to a disconnector mode request, when the first effective voltage value reaches the trigger voltage, the node voltage of the currently received associated terminal under test is stored in a preset second storage space for a preset second duration. The second effective voltage value of the node voltage is extracted and calculated from the first storage space. It is then determined whether the deviation between the first effective voltage value for a preset first duration and the second effective voltage value for a preset second duration and the normal voltage meets a preset deviation threshold. If not, it is determined that the terminal under test has a loop fault. If the first effective voltage value fails to reach the trigger voltage, it is determined that the terminal under test has a loop fault.

[0029] Furthermore, the client is used to send remote control signals for opening and closing the circuit breaker to the monitoring and control screen; generate and display corresponding disconnector fault reports based on the relevant information of the problematic terminal under test; the fault report includes the terminal number corresponding to the fault point, the detection location, the fault basis, and the status of the operating faulty component.

[0030] As can be seen from the above technical solutions, the present invention has the following advantages:

[0031] This invention provides a system for confirming the operating conditions of a disconnect switch and diagnosing circuit faults, comprising: a voltage acquisition device and an intelligent operation and maintenance platform; the voltage acquisition device is embedded in the disconnect switch terminal box and the mechanism box, and terminal block probes are inserted into the terminals to be tested in the terminal blocks of the disconnect switch terminal box and the mechanism box; the input end of the voltage acquisition device is connected to the terminal block probes; the voltage acquisition device is used to acquire the node voltage of each terminal to be tested in the terminal block; the intelligent operation and maintenance platform is communicatively connected to the disconnect switch control circuit and the voltage acquisition device, respectively, for sending remote control signals for opening and closing the disconnect switch to the disconnect switch control circuit, and receiving the node voltage of the terminal to be tested acquired by the voltage acquisition device; in response to a disconnect switch mode request, it determines whether the deviation of the node voltage of each terminal to be tested from the normal voltage meets a preset deviation threshold; if it does not meet the threshold, it determines that the terminal to be tested has a disconnect switch operating condition not met or a circuit fault problem, and generates a disconnect switch fault report.

[0032] In this invention, the disconnector operation condition confirmation and circuit fault diagnosis system is used to monitor the disconnector control and motor circuit. It collects the node voltage of each terminal under test on the terminal block through a voltage acquisition device, and simultaneously establishes an electrical connection between the terminal block probe and the terminal block node to improve the reliability of voltage acquisition. The intelligent operation and maintenance platform determines whether the deviation between the node voltage of each terminal under test and the normal voltage meets the preset deviation threshold to judge whether the disconnector operation conditions are met and to locate the fault in the disconnector control and motor circuit, thereby realizing the automated diagnosis of the cause of disconnector failure to operate, and thus solving the technical problem that it is difficult to automate the diagnosis of disconnector failure to operate in the prior art. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A connection diagram of a disconnector operation condition confirmation and circuit fault diagnosis system provided in this application;

[0035] Figure 2 A schematic diagram of the monolithic detector structure provided in this application;

[0036] Figure 3 A schematic diagram of the monolithic detector structure provided in this application and the structure of multiple monolithic detector structures assembled together;

[0037] Figure 4 A schematic diagram illustrating the implementation of the 50% pre-triggering function provided in this application;

[0038] Figure 5 A schematic diagram of the control loop for the Areva knife switch section in the example provided in this application;

[0039] The attached diagram is labeled as follows: 1. Fixing screw; 2. Wire; 3. Metal sheet; 4. Upper and lower telescopic pins; 5. T-shaped fixing insulating base; 6. Assembly guide fixing hole; 7. First-stage buckle; 8. Upper and lower guide square post; 9. Second-stage buckle; 10. Inner slot; 11. Left and right locking screws; 12. Metal sheet M2.5 hole; 13. Left and right locking square copper post; 14. Track slot; and 15. Detection housing. Detailed Implementation

[0040] This invention provides a system for confirming the operating conditions of a disconnector and diagnosing circuit faults, which solves the technical problem that existing technologies struggle to automate the diagnosis of disconnector failure to operate.

[0041] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] See Figure 1 An embodiment of a disconnector operation condition confirmation and circuit fault diagnosis system provided in this application includes: a voltage acquisition device and an intelligent operation and maintenance platform;

[0045] The voltage acquisition device is embedded in the disconnector terminal box and the mechanism box. Terminal probes are inserted into the terminals to be tested in the terminal blocks of the disconnector terminal box and the mechanism box. The input terminal of the voltage acquisition device is connected to the terminal probes. The voltage acquisition device is used to acquire the node voltage of each terminal to be tested in the terminal block.

[0046] The intelligent operation and maintenance platform is communicatively connected to the disconnector control circuit and the voltage acquisition device, respectively. It is used to send remote control signals for opening and closing the disconnector to the disconnector control circuit; receive the node voltage of the terminal under test collected by the voltage acquisition device; and respond to the disconnector mode request to determine whether the deviation of the node voltage of each terminal under test from the normal voltage meets the preset deviation threshold. If it does not meet the threshold, it is determined that the terminal under test has a disconnector operation condition failure or circuit fault problem, and a disconnector fault report is generated.

[0047] It should be noted that the disconnector terminal box is a device box in a substation used to centrally connect the electrical circuits related to the disconnector switch (disconnector), providing a centralized transfer point for various electrical connections in the disconnector circuit; while the disconnector mechanism box is the protective enclosure for the operating mechanism of the disconnector switch (disconnector), and is the key part in the disconnector circuit to realize the opening and closing operation of the disconnector. The control signals in the disconnector circuit are ultimately transmitted to the operating mechanism in the disconnector mechanism box; the disconnector circuit includes the disconnector control circuit and the disconnector electrical circuit.

[0048] It should be noted that unmet operating conditions for the disconnect switch refer to external limitations that prevent the switch from operating normally. Examples include discrepancies between the "remote / local" setting and the actual operating conditions, the secondary circuit power supply circuit breaker not being engaged, and electrical five-proof interlocking. A disconnect switch circuit fault refers to a malfunction in the disconnect switch control and motor circuit (including control power supply, control lines, relays, and opening / closing buttons), preventing the switch from opening or closing according to instructions. Examples of faults include loose or broken wires.

[0049] In this invention, in response to a disconnector mode (closing / opening, remote / local) request, the operating conditions of the disconnector are determined by measuring the voltage of the terminal node under test, and faults in the disconnector control and motor circuits are located. Specifically, when the operating conditions of the disconnector are not met or when faults occur in the disconnector control and motor circuits, the node voltage deviates from the normal voltage. The node voltage collected by the voltage acquisition device is compared with the normal voltage under the associated disconnector mode, and the degree of deviation is used to determine the cause of the disconnector's failure to operate, thereby achieving automated diagnosis of the cause. It is understood that the normal voltage of each terminal under test should be different under different disconnector modes; for example, the normal voltage of terminal A under test should be 220V in the closing mode, while its normal voltage should be 0V in the opening mode.

[0050] Understandably, in remote control mode, operators can send opening and closing remote control signals through the intelligent operation and maintenance platform from a location far away from the disconnector equipment (such as the main control room). Under normal circumstances, after receiving the corresponding remote control signal, the disconnector control circuit will experience a corresponding voltage change, which will be reflected in the node voltage of the terminal block under test on the disconnector terminal box and mechanism box.

[0051] To ensure the reliability and accuracy of the node voltage acquisition of the terminal under test, this invention designs a robust and reliable terminal block probe, which is electrically connected to the terminal under test of the terminal block and serves as the input of the voltage acquisition device.

[0052] In one specific embodiment, the terminal block probe includes one or more monolithic probe structures. Since some terminals of the terminal block to be tested are continuous and some are discontinuous, the terminal block probe structure of this invention is designed as an assemblable probe structure, which can be used monolithically, such as... Figure 2 As shown, they can also be used in groups, such as Figure 3 As shown.

[0053] Please see Figure 2 The single-piece detection structure includes a fixing screw 1, a wire 2, a metal sheet 3, upper and lower telescopic pins 4, and a T-shaped fixed insulating base 5. The fixing screw 1 is used to fix and connect the wire 2, the metal sheet 3, and the T-shaped fixed insulating base 5 in sequence. The metal sheet 3 is provided with upper and lower telescopic pins 4 on both sides, and the upper and lower telescopic pins 4 pass through the T-shaped fixed insulating base 5 and the terminal to be tested.

[0054] exist Figure 2 In this structure, components 1-9 constitute a single-piece detection structure, while components 10-14 constitute the structure of the terminals under test of the terminal block. The structure of the terminals under test includes an internal locking slot 10, left and right locking screws 11, M2.5 holes in the metal plate 12, left and right locking square copper pillars 13, and a track locking slot 14.

[0055] It should be noted that the metal sheet 3 acts as a conductor to form an electrical connection between the wire 2 and the upper and lower telescopic pins 4; the upper and lower telescopic pins 4 are equipped with springs inside, which have a telescopic function and can directly and tightly contact the inherent screw of the terminal under test; the T-shaped fixed insulating base 5 is used to fix the fixing screw 1, the wire 2, the metal sheet and the upper and lower telescopic pins 4. At the same time, the T-shaped fixed insulating base 5 is made of insulating material to achieve the insulation performance of each single detection structure during assembly.

[0056] In one specific embodiment, one end of the wire 2 has a ring structure, through which the fixing screw 1 passes and is connected to the metal sheet 3 and the fixing screw 1 by spot welding.

[0057] In one specific embodiment, the T-shaped fixed insulating base 5 includes a lateral fixing part and upper and lower guide columns 8; both sides of the lateral fixing part are provided with assembly guide fixing holes 6; the upper and lower guide columns 8 are provided with multi-stage buckles that are adapted to the body structure of the terminal to be tested.

[0058] Understandably, during assembly, the upper and lower guide posts 8 need to extend into the slots of the terminal under test; the assembly guide fixing holes 6 can realize the assembly and fixing of multiple single-piece probe structures. Among them, the multi-stage buckle includes a first-stage buckle 7 and a second-stage buckle 9; the first-stage buckle 7 is used to cooperate with the in-piece locking position 10 in the body structure of the terminal under test, thereby strengthening the tightness of the upper and lower telescopic pins 4; the second-stage buckle 9 is inserted into the M2.5 hole 12 of the metal sheet to achieve buckle fixing.

[0059] In addition, the single-piece detection structure also includes a detection housing 15, which is manufactured by potting technology. The detection housing is compatible with the structure after the fixing screw 1, wire 2, metal sheet 3, upper and lower telescopic pins 4 and T-type fixed insulating base 5 are successfully assembled. It is used to protect the fixing screw 1, wire 2, metal sheet, upper and lower telescopic pins 4 and T-type fixed insulating base 5.

[0060] In one specific embodiment, the voltage acquisition device includes a transformer isolation module, an ADC data acquisition module, a processor, and a remote data transmission module that are electrically connected in sequence.

[0061] It should be noted that the node voltage of the terminal under test first enters the transformer isolation module. This module provides electrical isolation, preventing interference between the switch control and motor circuits and the voltage acquisition device, thus improving the reliability and safety of the voltage acquisition device. Next, the voltage signal, after electrical isolation and preliminary processing by the transformer isolation module, is transmitted to the ADC data acquisition module. The ADC module converts the acquired node voltage signal into a digital signal at a certain sampling frequency and transmits it to the processor for data processing (such as data filtering). The remote data transmission module transmits the processed voltage signal to the intelligent operation and maintenance platform, ensuring the reliability and efficiency of remote data transmission. Furthermore, the remote data transmission module can also receive instructions from the intelligent operation and maintenance platform and transmit these instructions to the processor. The processor can adjust the acquisition parameters of the voltage acquisition device (such as the acquisition frequency and data transmission frequency) according to the instructions.

[0062] In addition, to facilitate the embedding and installation of the voltage acquisition device in the switch terminal box and mechanism box, the circuit board and body of the voltage acquisition device, which are compatible with the transformer isolation module, ADC data acquisition module, processor and remote data transmission module, can be designed to be very compact and small.

[0063] In one specific embodiment, the intelligent operation and maintenance platform includes a server and a client connected by communication; the server is connected to the voltage acquisition device through an intelligent gateway; the client is connected to the measurement and control panel through an Ethernet switch, and the measurement and control panel is connected to the disconnector control circuit.

[0064] It should be noted that the server implements the functions of receiving, storing and analyzing the collected data, while the client implements the functions of issuing control commands and displaying fault information. The intelligent operation and maintenance platform server receives the collected data based on the southbound interface protocol Modbus, and compares the voltage of each node with the normal voltage of the corresponding mode (remote control / local, open / close). If the deviation is large, it is the fault point.

[0065] In one specific embodiment, the server is used for,

[0066] Store the number of each terminal under test and its corresponding normal status data under different disconnector modes; receive the node voltage of the terminal under test collected by the voltage acquisition device; wherein, the normal status data includes the normal voltage of the terminal under test and the status of the normally operating components.

[0067] Determine whether the node voltage of the received terminal under test is associated with the control terminal that starts the motor. It is understandable that when storing the information of each terminal under test, a corresponding control terminal library should be established, and the terminal under test should be associated with the control terminal library through its number.

[0068] For the control terminal that starts the motor rotation, the server is designed with a corresponding pre-trigger function. Specifically, if associated, the associated terminal voltage under test is stored in real time. In response to the switch mode request, it is determined whether the stored terminal voltage under test meets the trigger condition and whether the deviation between the terminal voltage under test and the normal voltage in the associated switch mode meets the preset deviation threshold. If not, it is determined that there is a loop fault problem in the terminal under test.

[0069] If not associated, in response to the disconnector mode request, the deviation between the node voltage of the terminal under test and the normal voltage in the associated disconnector mode is judged in real time. If the deviation is greater than the preset deviation threshold, it is confirmed that the terminal under test has a disconnector operation condition not met or a circuit fault problem; the relevant information of the terminal under test with the problem is sent to the client.

[0070] It should be noted that since the switch control and motor circuit are only conductive when the motor is rotating, the server is designed with a corresponding pre-trigger function to confirm the fault of the control terminal for starting the motor. That is, after issuing the opening and closing command or pressing the opening and closing button, the node voltage data collected from the control terminal for starting the motor for a certain period of time needs to be judged to determine whether it conforms to the normal voltage and thus confirm the fault point.

[0071] In this invention, the server can calculate the absolute value of the difference between the node voltage and the normal voltage to determine the degree of deviation between the node voltage of the terminal under test and the normal voltage in the associated disconnector mode. When the absolute value of the difference is greater than the preset deviation threshold, it indicates that the terminal under test is faulty.

[0072] Taking the 220kV Areva open-type knife switch terminal box and mechanism box as an example, this invention selects the terminal blocks to be tested as the test points shown in Table 1, and gives the component status and voltage criteria when the operation is normal and there is a fault.

[0073] Table 1. Criteria for Component Status and Voltage When the Switch Operates Normally and When a Circuit Fault Exists.

[0074]

[0075] In this example, 220V is used as the normal voltage, and 20V is used as the preset deviation threshold. In Table 1, the test terminals numbered 1, 9, 10 and 11 are associated with determining whether the operating conditions of the disconnect switch are met, while the test terminals numbered other are associated with determining whether there is a fault in the disconnect switch circuit.

[0076] More specifically regarding the pre-trigger function, if associated, the server stores the node voltage of the associated terminal under test in a preset first storage space for a preset first duration and overwrites it cyclically. At the same time, it extracts and calculates the first effective value of the node voltage from the first storage space. In response to a disconnector mode request, when the first effective value of the voltage reaches the trigger voltage, the server stores the currently received node voltage of the associated terminal under test in a preset second storage space for a preset second duration and extracts and calculates the second effective value of the node voltage from the first storage space. At this point, the pre-trigger function is completed.

[0077] Then, the server continues to determine whether the deviation between the first effective voltage value for a preset first duration and the second effective voltage value for a preset second duration and the normal voltage meets the preset deviation threshold. If it does not meet the threshold, it is determined that the terminal under test has a loop fault problem. Conversely, when the first effective voltage value fails to reach the trigger voltage, it is determined that the terminal under test has a loop fault problem.

[0078] Continuing with Table 1 as an example, the terminals to be tested, numbered 17-20, belong to the control terminals for starting the motor rotation. Therefore, for the detection of terminals to be tested, numbered 17-20, this invention has designed a corresponding pre-trigger function. That is, after the circuit is closed or the circuit is closed by issuing the opening and closing command or pressing the opening and closing button, the server saves the data before and after the trigger. The fault point is determined by judging whether the data after the trigger conforms to the normal voltage condition. It can be understood that the data before and after the trigger can be saved in the form of waveform.

[0079] like Figure 4 As shown, taking the 50% pre-trigger function as an example, two contiguous storage regions, each of size L, are first defined, with their starting addresses being RX_A and RX_B, respectively. The collected data is continuously stored in the preset first storage space starting at address RX_A, with each storage overwriting the previous storage content. This continues until time t0, when a trigger command is detected. The collected data at this moment is then stored in the preset second storage space starting at address RX_B. Subsequently, the stored data starting at address RX_A with a length of 2L is sent up, thus realizing the 50% pre-trigger function. It can be understood that other percentage trigger functions can be implemented by adjusting the data length before and after triggering. For example, the 40% pre-trigger function occupies 40% of the total storage space in the preset first storage space starting at address RX_A. Different percentage trigger functions can be adjusted according to the actual voltage waveform display interface and actual operating conditions.

[0080] Based on actual testing, this invention allows for the storage, calculation, and analysis of data with a preset first duration of 200ms before triggering and a preset second duration of 2s after triggering. Taking terminal XT1-13 (serial number 19) in Table 1 as an example, the control circuit diagram for the Areva knife switch is as follows: Figure 5 As shown:

[0081] (1) If the circuit is intact and the trip button SB1 is pressed, the control circuit will be connected during the tripping process of the knife switch. After the knife switch is tripped to the position, the travel contact will be disconnected and the control circuit will be disconnected.

[0082] (2) If the self-holding circuit fails and the trip button SB1 is pressed, the control circuit will only be connected when the trip button is pressed, and the control circuit will be disconnected when the trip button is released.

[0083] (3) If there is a wiring fault in the SB1 component of the trip button, the control circuit will be blocked when the trip button is pressed.

[0084] To identify the three operating conditions mentioned above, the XT1-13 must have a pre-trigger function. This means the diagnostic system collects and stores the node voltage of the XT1-13 terminals in real time in a preset first storage space starting at RX_A. After accumulating 200ms of voltage data, the next voltage data is continuously refreshed and placed in a preset second storage space starting at RX_A, while simultaneously calculating its effective value. Before pressing the trip button, the calculated effective value is approximately 0V. Once the trip button is pressed and the circuit is open, the calculated effective voltage value will be greater than 220*80%V. Therefore, the calculation of an effective voltage value greater than 220*80%V serves as the trigger, writing the next 2 seconds of voltage data into the second storage space starting at RX_B. This achieves the pre-trigger function.

[0085] For the above three operating conditions: (1) If no trigger signal is received, it means that the circuit is not open and the fault occurs on the power supply side of node XT1-13; (2) If a trigger signal is received, the effective voltage value is 220V±20% for the first 200ms and less than 220V±20% for the last 2s, it means that the self-holding circuit is faulty; (3) If a trigger signal is received, the effective voltage value is 220V±20% for both the first 200ms and the last 2s, it means that the circuit is intact. The terminals numbered 17, 18, and 20 in Table 1 are treated similarly to terminal numbered 19.

[0086] In one specific embodiment, the client is used to send remote control signals for opening and closing the circuit breaker to the monitoring and control screen; generate and display the corresponding disconnector fault report based on the relevant information of the problematic terminal under test; the fault report includes the terminal number corresponding to the fault point, the detection location, the fault basis, and the status of the operating faulty component.

[0087] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for confirming the operating conditions of a disconnect switch and diagnosing circuit faults, characterized in that, The utility model relates to a kind of voltage acquisition device and intelligent operation and maintenance platform;Voltage acquisition device is embedded in the terminal box of knife switch and mechanism box, and terminal probe is inserted into the terminal of terminal row of terminal box of knife switch and mechanism box;The input end of voltage acquisition device is connected with terminal probe;Voltage acquisition device is used to collect the node voltage of each terminal to be measured of terminal row; Intelligent operation and maintenance platform is connected with the control loop of knife switch and voltage acquisition device respectively, for sending opening and closing control signal to the control loop of knife switch;Receive the node voltage of terminal to be measured collected by voltage acquisition device, respond to the request of knife switch mode, judge whether the deviation degree of node voltage of each terminal to be measured and normal voltage meets preset deviation threshold, if not meet, determine that the terminal to be measured exists knife switch operation condition not to meet or loop fault problem, generate knife switch fault report; Intelligent operation and maintenance platform includes server and client connected by communication; Server is connected with voltage acquisition device by intelligent gateway; Client is connected with measurement and control screen by Ethernet switch, and measurement and control screen is connected with the control loop of knife switch; Server is used to store the number of each terminal to be measured and its corresponding normal state data under different knife switch mode;Receive the node voltage of terminal to be measured collected by voltage acquisition device;Normal state data includes normal voltage of terminal to be measured and operating normal element state; Judge whether the node voltage of terminal to be measured received and the control terminal of starting motor rotation are associated; If not associated, respond to the request of knife switch mode to judge the deviation degree of node voltage of terminal to be measured and normal voltage under associated knife switch mode in real time, if the deviation degree is greater than preset deviation threshold, confirm the terminal to be measured, then determine that the terminal to be measured exists knife switch operation condition not to meet or loop fault problem; If associated, store the node voltage of associated terminal to be measured in preset first storage space and store for preset first duration, and cyclically cover, simultaneously extract and calculate the first voltage effective value of node voltage from first storage space; Respond to the request of knife switch mode, when first voltage effective value reaches trigger voltage, store the node voltage of associated terminal to be measured currently received in preset second storage space and store for preset second duration, extract and calculate the second voltage effective value of node voltage from second storage space;Judge whether the deviation degree of first voltage effective value for preset first duration and second voltage effective value for preset second duration and normal voltage meets preset deviation threshold, if not meet, determine that the terminal to be measured exists loop fault problem;When first voltage effective value continuously does not reach trigger voltage, determine that the terminal to be measured exists loop fault problem; Send the relevant information of terminal to be measured with problem to client. Terminal probe includes one or more single detection structure; Single detection structure includes fixed screw, wire, metal sheet, up-down telescopic pin and T-shaped fixed insulating seat; Fixed screw is used to fixedly connect wire, metal sheet and T-shaped fixed insulating seat in sequence.

2. The kind of a knife gate operation condition confirmation and loop fault diagnostic system according to claim 1, its characterized in that, ​ ​ ​ The upper and lower telescopic pins are arranged on both sides of the metal sheet and pass through the T-shaped fixed insulation seat and the terminal to be tested.

3. The kind of a knife gate operation condition confirmation and loop fault diagnostic system according to claim 2, its characterized in that, One end of the wire has a circular ring structure, the circular ring structure is penetrated by the fixed screw, and the wire is connected with the metal sheet and the fixed screw in a spot welding manner.

4. The kind of a knife gate operation condition confirmation and loop fault diagnostic system according to claim 3, its characterized in that, The T-shaped fixed insulation seat comprises a transverse fixing part and an upper and lower guide square column. Assembled guide fixing holes are arranged on both sides of the transverse fixing part. The upper and lower guide square column is provided with a plurality of stages of buckles matched with the body structure of the terminal to be tested.

5. The kind of a knife gate operation condition confirmation and loop fault diagnostic system according to claim 1, its characterized in that, The voltage acquisition device comprises a transformer isolation module, an ADC data acquisition module, a processor and a remote data transmission module.

6. The kind of a knife gate operation condition confirmation and loop fault diagnostic system according to claim 1, its characterized in that, The server and the voltage acquisition device realize data communication based on a Modbus transmission protocol.

7. The kind of a knife gate operation condition confirmation and loop fault diagnostic system according to claim 1, its characterized in that, The client is used for sending opening and closing remote control signals to the measurement and control screen, generating and displaying a corresponding knife switch fault report according to relevant information of the terminal to be tested with problems, and the fault point report comprises a terminal number corresponding to a fault point, a detection position, a fault basis and an operation fault element state.

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