Disconnecting link operation condition confirmation and loop fault diagnosis system

Abstract

The invention discloses a disconnecting link operation condition confirmation and loop fault diagnosis system. The system comprises a voltage acquisition device and an intelligent operation and maintenance platform, the voltage acquisition device is embedded in the knife switch terminal box and the mechanism box, and terminal strip probes are inserted in to-be-tested terminals of terminal strips of the knife switch terminal box and the mechanism box; the input end of the voltage acquisition device is connected with the terminal strip probe; the voltage acquisition device is used for acquiring node voltage of each to-be-tested terminal of the terminal strip; the intelligent operation and maintenance platform is in communication connection with the disconnecting link control loop and the voltage acquisition device and is used for sending a switching-on and switching-off remote control signal to the disconnecting link control loop; receiving node voltage of the to-be-tested terminal acquired by the voltage acquisition device; and in response to the disconnecting link mode request, judging whether the deviation degree between the node voltage of each terminal to be detected and the normal voltage meets a preset deviation threshold value, if not, determining that the terminal to be detected has the problem that the disconnecting link operation condition is not met or a loop fault exists, and generating a disconnecting link fault report, thereby realizing automatic diagnosis of the disconnecting link refusing reason.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, and in particular to a knife switch operating condition confirmation and circuit fault diagnosis system. Background Art

[0002] The knife switch is one of the key devices for adjusting the operation mode of the power system, and its control and motor circuits are the core components for realizing the opening and closing of the knife switch. During the switching operation, the knife switch often refuses to operate due to failure to meet the operating conditions or control circuit failure. Common situations include: "remote / local" is inconsistent with the actual operation, the secondary circuit power supply air switch is not put on, the electrical five-protection lock, the wire is not connected and the wire is broken, etc. The operation and maintenance personnel need to spend a lot of time to diagnose and restore the cause of the refusal to operate, which seriously reduces the operation efficiency and directly affects the power supply reliability of the power system.

[0003] Therefore, it is urgent to develop a knife switch operating condition confirmation and circuit fault diagnosis system to realize the automation of the diagnosis of the cause of knife switch refusal to operate. Summary of the invention

[0004] The invention provides a knife switch operation condition confirmation and circuit fault diagnosis system, which is used to solve the technical problem that it is difficult to realize the automation of knife switch refusal cause diagnosis in the prior art.

[0005] The present invention provides a switch 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 and installed in the knife switch terminal box and the mechanism box, and the terminals to be tested of the terminal blocks of the knife switch terminal box and the mechanism box are plugged with terminal block probes; the input end of the voltage acquisition device is connected to the terminal block probe; the voltage acquisition device is used to collect the node voltage of each terminal to be tested of the terminal block;

[0007] The intelligent operation and maintenance platform is respectively communicated with the knife switch control circuit and the voltage acquisition device, and is used to send the opening and closing remote control signal to the knife switch control circuit; receive the node voltage of the terminal to be tested collected by the voltage acquisition device; in response to the knife switch mode request, determine whether the degree of deviation between the node voltage of each terminal to be tested and the normal voltage meets the preset deviation threshold; if not, it is determined that the knife switch operation conditions are not met or there is a circuit fault problem at the terminal to be tested, and generate a knife switch fault report.

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

[0009] The monolithic detection structure comprises fixing screws, wires, metal sheets, upper and lower telescopic pins and a T-shaped fixed insulating seat;

[0010] The fixing screws are used to fix the connecting wires, the metal sheet and the T-shaped fixing insulating seat in sequence;

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

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

[0013] Furthermore, the T-shaped fixed insulating seat includes a transverse fixing portion and upper and lower guiding square columns;

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

[0015] The upper and lower guiding square columns are provided with multi-stage buckles adapted to the body structure of the terminal to be tested.

[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 communication-connected server and client;

[0018] The server is connected to the voltage acquisition device through a smart gateway;

[0019] The client is connected to a measurement and control screen via an Ethernet switch, and the measurement and control screen is communicatively connected with the knife switch control circuit.

[0020] Furthermore, the server and the voltage acquisition device achieve data communication based on the Modbus transmission protocol.

[0021] Furthermore, the server is used to:

[0022] Store the serial number of each terminal to be tested and its corresponding normal state data under different switch modes; receive the node voltage of the terminal to be tested collected by the voltage collection device; wherein the normal state data includes the normal voltage of the terminal to be tested and the normal operation component state;

[0023] Determine whether the received node voltage of the terminal to be tested is associated with the control terminal that starts the motor to rotate;

[0024] If not associated, in response to the knife switch mode request, determine in real time the degree of deviation between the node voltage of the terminal to be tested and the normal voltage in the associated knife switch mode; if the degree of deviation is greater than a preset deviation threshold, confirm that the terminal to be tested does not meet the knife switch operation conditions or has a circuit breaker fault problem;

[0025] If associated, the node voltage of the associated terminal to be tested is stored in real time, and in response to the switch mode request, it is determined whether the stored node voltage of the terminal to be tested meets the trigger condition and whether the deviation degree between the node voltage of the terminal to be tested and the normal voltage under the associated switch mode meets the preset deviation threshold. If not, it is determined that there is a circuit fault problem in the terminal to be tested;

[0026] The relevant information of the terminal to be tested having problems is sent to the client.

[0027] Further, the server is specifically used to, if associated, store the node voltage of the associated terminal to be tested in a preset first storage space and store it for a preset first time length, and cyclically cover it, and at the same time extract and calculate the first voltage effective value of the node voltage from the first storage space;

[0028] In response to the knife switch mode request, when the effective value of the first voltage reaches the trigger voltage, the node voltage of the associated terminal to be tested currently received is stored in the preset second storage space and the storage continues for the preset second time period, and the second voltage effective value of the node voltage is extracted and calculated from the first storage space; it is determined whether the deviation degree between the first voltage effective value that continues for the preset first time period and the second voltage effective value that continues for the preset second time period and the normal voltage meets the preset deviation threshold; if not, it is determined that the terminal to be tested has a circuit fault problem; when the first voltage effective value continues to fail to reach the trigger voltage, it is determined that the terminal to be tested has a circuit fault problem.

[0029] Furthermore, the client is used to send opening and closing remote control signals to the measurement and control screen; generate and display corresponding knife switch fault reports based on relevant information of the terminal to be tested with problems; the fault point report includes the terminal number corresponding to the fault point, the detection location, the fault basis and the operating fault component status.

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

[0031] The present invention provides a knife switch operation condition confirmation and circuit fault diagnosis system, comprising: a voltage acquisition device and an intelligent operation and maintenance platform; the voltage acquisition device is embedded and installed in a knife switch terminal box and a mechanism box, and a terminal row probe is inserted into the terminals to be tested of the terminal rows of the knife switch terminal box and the mechanism box; the input end of the voltage acquisition device is connected with the terminal row probe; the voltage acquisition device is used to acquire the node voltage of each terminal to be tested of the terminal row; the intelligent operation and maintenance platform is respectively connected to the knife switch control circuit and the voltage acquisition device for communication, and is used to send a switch opening and closing remote control signal to the knife switch control circuit, and receive the node voltage of the terminal to be tested acquired by the voltage acquisition device; in response to a knife switch mode request, it is judged whether the deviation degree of the node voltage of each terminal to be tested from the normal voltage meets a preset deviation threshold value, if not, it is determined that the knife switch operation condition is not met or there is a circuit fault problem at the terminal to be tested, and a knife switch fault report is generated.

[0032] In the present invention, the knife switch operating condition confirmation and circuit fault diagnosis system is used to monitor the knife switch control and the motor circuit. The node voltage of each terminal to be tested of the terminal block is collected by a voltage acquisition device, and the terminal block probe is electrically connected to the terminal block node to improve the reliability of voltage acquisition; the intelligent operation and maintenance platform determines whether the deviation degree between the node voltage of each terminal to be tested and the normal voltage meets the preset deviation threshold to determine whether the knife switch operating conditions are met and locate the knife switch control and motor circuit faults, thereby realizing the automatic diagnosis of the cause of knife switch refusal to operate, and then solving the technical problem that it is difficult to realize the automatic diagnosis of the cause of knife switch refusal to operate in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

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

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

[0036] Figure 3 A schematic diagram of the structure of a single-chip detection structure and multiple single-chip detection structures after assembly provided by the present application;

[0037] Figure 4 Schematic diagram of the implementation of the 50% pre-trigger function provided in this application;

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

[0039] Among them, the figure markings are: fixing screws 1, wires 2, metal sheets 3, upper and lower telescopic pins 4, T-shaped fixed insulating seat 5, assembly guide fixing holes 6, first-stage buckles 7, upper and lower guide square columns 8, second-stage buckles 9, internal clamping positions 10, left and right wire locking screws 11, metal sheet M2.5 holes 12, left and right wire locking square copper columns 13, track clamping positions 14 and detection housing 15. DETAILED DESCRIPTION

[0040] The embodiment of the present invention provides a knife switch operation condition confirmation and circuit fault diagnosis system, which is used to solve the technical problem that it is difficult to realize the automation of knife switch refusal cause diagnosis in the prior art.

[0041] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] See also Figure 1 , an embodiment of a knife switch operation condition confirmation and circuit fault diagnosis system provided by the present application includes: a voltage acquisition device and an intelligent operation and maintenance platform;

[0045] The voltage acquisition device is embedded and installed in the knife switch terminal box and the mechanism box. The terminals to be tested of the terminal blocks of the knife switch terminal box and the mechanism box are plugged with terminal block probes; the input end of the voltage acquisition device is connected to the terminal block probe; the voltage acquisition device is used to collect the node voltages of each terminal to be tested of the terminal block;

[0046] The intelligent operation and maintenance platform is respectively communicated with the knife switch control circuit and the voltage acquisition device, and is used to send the opening and closing remote control signal to the knife switch control circuit; receive the node voltage of the terminal to be tested collected by the voltage acquisition device; respond to the knife switch mode request, judge whether the degree of deviation between the node voltage of each terminal to be tested and the normal voltage meets the preset deviation threshold; if not, it is determined that the knife switch operation conditions are not met or there is a circuit fault problem at the terminal to be tested, and a knife switch fault report is generated.

[0047] It should be noted that the knife switch terminal box is an equipment box in the substation used to centrally connect the electrical circuits related to the disconnector (knife switch), providing a centralized transfer point for various electrical connections in the knife switch circuit; and the knife switch mechanism box is the protective box of the disconnector (knife switch) operating mechanism, and is the key part of the knife switch circuit to realize the knife switch opening and closing operations. The control signal in the knife switch circuit will eventually be transmitted to the operating mechanism in the knife switch mechanism box; among them, the knife switch circuit includes the knife switch control circuit and the knife switch electrical circuit.

[0048] It should be noted that the failure to meet the operating conditions of the knife switch means that there are some external conditions that limit the operation of the knife switch, so that the knife switch cannot be operated normally, such as the inconsistency between "remote / local" and the actual operation, the failure of the secondary circuit power supply air switch to be turned on, and the electrical five-protection lock, etc. The knife switch circuit failure means that the knife switch control and motor circuit (including control power supply, control circuit, relay, opening and closing buttons and other components) have a fault, and the knife switch cannot be opened or closed according to the instructions, such as the wire is not connected or broken, etc.

[0049] In the present invention, in response to the knife switch mode (closing / opening, remote control / local) request, the node voltage of the terminal to be tested is measured to determine whether the knife switch operating conditions are met and to locate the knife switch control and motor circuit faults. Among them, when the knife switch operating conditions are not met and the knife switch control and motor circuit fail, there is a deviation between the node voltage and the normal voltage. Then, the node voltage collected by the voltage acquisition device is compared with the normal voltage under the associated knife switch mode, and the degree of deviation is used to make a judgment, thereby realizing the automatic diagnosis of the cause of the knife switch refusal to operate. It can be understood that under different knife switch modes, the normal voltage of each terminal to be tested should be different; for example, the normal voltage of a terminal A to be tested should be 220V in the closing mode, and its normal voltage should be 0V in the opening mode.

[0050] It can be understood that in the remote control mode, the operator can send the opening and closing remote control signal through the intelligent operation and maintenance platform in a place far away from the knife switch equipment (such as in the main control room). Under normal circumstances, after the knife switch control circuit receives the corresponding remote control signal, the corresponding voltage change will occur in the knife switch circuit, and it will be reflected in the node voltage of the terminal to be tested in the terminal block of the knife switch terminal box and the mechanism box.

[0051] In order to ensure the reliability and accuracy of node voltage acquisition of the terminal to be tested, the present invention designs a firm and reliable terminal row probe, which is electrically connected to the terminal to be tested of the terminal row and serves as the input of the voltage acquisition device.

[0052] In a specific embodiment, the terminal block probe includes one or more monolithic detection structures. Since some of the terminals to be tested in the terminal block are continuous and some are discontinuous, the terminal block probe structure of the present invention is designed to be an assembleable detection structure, which can be used as a single piece. Figure 2 As shown, it can also be used in groups as Figure 3 shown.

[0053] See also 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 seat 5; the fixing screw 1 is used to fix the connecting wire 2, the metal sheet 3 and the T-shaped fixed insulating seat 5 in sequence; upper and lower telescopic pins 4 are provided on both sides of the metal sheet 3, and the upper and lower telescopic pins 4 pass through the T-shaped fixed insulating seat 5 and the terminal to be tested.

[0054] exist Figure 2 In the figure, components 1-9 constitute a single-chip detection structure, while components 10-14 constitute the structure of the terminal to be tested of the terminal row. The structure of the terminal to be tested includes an internal clamping position 10, left and right locking screws 11, a metal sheet M2.5 hole 12, left and right locking square copper pillars 13 and a track clamping position 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 provided with springs inside, which have a telescopic function and can be in direct and close contact with the inherent screws of the terminal to be tested; the T-shaped fixed insulating seat 5 is used to fix the screws 1, the wire 2, the metal sheet and the upper and lower telescopic pins 4. At the same time, the T-shaped fixed insulating seat 5 is made of insulating material to achieve the insulation performance of each single-piece detection structure during assembly.

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

[0057] In a specific embodiment, the T-shaped fixed insulating seat 5 includes a transverse fixing portion and upper and lower guide square columns 8; assembly guide fixing holes 6 are opened on both sides of the transverse fixing portion; the upper and lower guide square columns 8 are provided with multi-stage buckles adapted to the main body structure of the terminal to be tested.

[0058] It is understandable that during assembly, the upper and lower guide square columns 8 need to be inserted into the row slots of the terminals to be tested; the assembly guide fixing holes 6 can realize the assembly and fixation of multiple single-piece detection 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 internal position 10 in the body structure of the terminal to be tested, thereby strengthening the tightness of the upper and lower telescopic pins 4; the second-stage buckle 9 is inserted into the metal sheet M2.5 hole 12 to achieve buckle fixation.

[0059] In addition, the single-piece detection structure also includes a detection shell 15, which is manufactured by glue filling technology, and the detection shell is adapted to the structure after the fixing screws 1, the wires 2, the metal sheets 3, the upper and lower telescopic pins 4 and the T-shaped fixed insulating seat 5 are successfully assembled, and is used to protect the fixing screws 1, the wires 2, the metal sheets, the upper and lower telescopic pins 4 and the T-shaped fixed insulating seat 5.

[0060] In a 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 to be tested first enters the transformer isolation module, which is used to achieve electrical isolation, so that the knife switch control and the motor circuit and the voltage acquisition device interfere with each other, and improve the reliability and safety of the voltage acquisition device; then the voltage signal after electrical isolation and preliminary processing by the transformer isolation module is obtained, and transmitted to the ADC data acquisition module. The ADC data acquisition module can convert the collected node voltage signal into a digital signal according to a certain sampling frequency, and transmit it to the processor for data processing (such as data filtering); the remote data transmission module is used to transmit the voltage signal processed by the processor to the intelligent operation and maintenance platform to ensure the reliability and transmission efficiency of remote data transmission. On the other hand, the remote data transmission module can also receive instructions from the intelligent operation and maintenance platform, and then transmit these instructions to the processor. The processor can adjust the acquisition parameters of the voltage acquisition device (such as acquisition frequency and data transmission frequency, etc.) according to the instructions.

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

[0063] In a specific embodiment, the intelligent operation and maintenance platform includes a server and a client that are communicatively connected; the server is communicatively connected to the voltage acquisition device through an intelligent gateway; the client is connected to the measurement and control screen through an Ethernet switch, and the measurement and control screen is communicatively connected to the knife switch control circuit.

[0064] It should be noted that the server realizes the functions of receiving, storing and analyzing collected data, and the client realizes the functions of issuing control commands and displaying fault information; the intelligent operation and maintenance platform server realizes the reception of 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 / closed). If the deviation is large, it is a fault point.

[0065] In a specific embodiment, the server is used to:

[0066] Store the serial number of each terminal to be tested and its corresponding normal state data under different switch modes; receive the node voltage of the terminal to be tested collected by the voltage collection device; wherein the normal state data includes the normal voltage of the terminal to be tested and the normal operation component state;

[0067] Determine whether the received node voltage of the terminal to be tested is associated with the control terminal for starting the motor to rotate; it is understandable that when storing the information of each terminal to be tested, a corresponding control terminal library should be established, and the terminal to be tested should be associated with the control terminal library through its number.

[0068] The server is designed with a corresponding pre-trigger function for the control terminal for starting the motor rotation; specifically, if associated, the node voltage of the associated terminal to be tested is stored in real time, and in response to the knife switch mode request, it is determined whether the stored node voltage of the terminal to be tested meets the trigger condition and whether the deviation degree between the node voltage of the terminal to be tested and the normal voltage under the associated knife switch mode meets the preset deviation threshold. If not, it is determined that there is a circuit fault problem in the terminal to be tested;

[0069] If there is no association, in response to the knife switch mode request, the degree of deviation between the node voltage of the terminal to be tested and the normal voltage under the associated knife switch mode is judged in real time. If the deviation degree is greater than the preset deviation threshold, it is confirmed that the terminal to be tested has a knife switch operating condition that is not met or a circuit fault problem; the relevant information of the problematic terminal to be tested is sent to the client.

[0070] It should be noted that since the knife switch control and motor circuit are only turned on when the motor is rotating, the server is designed with a corresponding pre-trigger function for fault confirmation of the control terminal that starts the motor rotation. That is, after issuing the opening and closing command or pressing the opening and closing button, the node voltage data collected within a certain period of time at the control terminal that starts the motor rotation is subjected to fault judgment to determine whether it meets the normal voltage and then confirm the fault point.

[0071] In the present 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 to be tested and the normal voltage in the associated switch mode. When the absolute value of the difference is greater than the preset deviation threshold, it indicates that there is a fault in the terminal to be tested.

[0072] Taking the 220kV AREVA open knife switch terminal box and mechanism box as an example, the present invention selects the terminals to be tested of the terminal row shown in Table 1 as the points to be detected, and gives the component status and voltage criteria when the operation is normal and when there is a fault.

[0073] Table 1 Component status and voltage criteria when the switch is operating normally and the circuit has a fault

[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 terminals to be tested with serial numbers 1, 9, 10 and 11 are associated with judging whether the knife switch operating conditions are met, while the terminals to be tested with other serial numbers are associated with judging whether there is a fault in the knife switch circuit.

[0076] More specifically for the pre-trigger function, if associated, the server stores the node voltage of the associated terminal to be tested in a preset first storage space and stores it for a preset first time period, and cyclically overwrites it, and at the same time extracts and calculates the first voltage effective value of the node voltage from the first storage space; in response to the knife switch mode request, when the first voltage effective value reaches the trigger voltage, the currently received node voltage of the associated terminal to be tested is stored in a preset second storage space and stores it for a preset second time period, and extracts and calculates the second voltage effective value of the node voltage from the first storage space; at this time, the pre-trigger function is completed.

[0077] Then, the server continues to determine whether the deviation between the first voltage effective value that lasts for the first preset time period and the second voltage effective value that lasts for the second preset time period and the normal voltage meets the preset deviation threshold. If not, it is determined that there is a circuit fault problem in the terminal to be tested; conversely, when the first voltage effective value continues to fail to reach the trigger voltage, it is determined that there is a circuit fault problem in the terminal to be tested.

[0078] Continuing with Table 1 as an example, the terminals to be tested with serial numbers 17-20 belong to the control terminals for starting the motor to rotate. Therefore, for the detection of the terminals to be tested with serial numbers 17-20, the present invention designs a corresponding pre-trigger function, that is, after issuing a switch-on / off command or pressing the switch-on / off button, the server saves the data before and after the trigger, and determines the fault point by judging whether the data after the trigger meets the normal voltage condition; it can be understood that the data before and after the trigger can be saved in the form of a waveform.

[0079] like Figure 4 As shown, taking the 50% pre-trigger function as an example, first define two storage areas of size L and continuous, and their first addresses are: RX_A and RX_B. The collected data is continuously stored in the preset first storage space with RX_A as the first address, and each storage overwrites the previous storage content until time t0, when the trigger instruction trigger is detected, and the collected data at this moment is stored in the preset second storage space with RX_B as the first address, and then the storage data with RX_A as the first address and a length of 2L is sent to realize the 50% pre-trigger function. It can be understood that other percentage trigger functions can be realized by adjusting the data length before and after the trigger. For example, the 40% pre-trigger function is that the preset first storage space with RX_A as the first address occupies 40% of all storage space, and different percentage trigger functions can be adjusted according to the actual voltage waveform display interface and actual working conditions.

[0080] According to actual tests, the present invention can set the first time length to be 200ms before triggering and the second time length to be 2s after triggering for data storage, calculation and analysis. Taking the XT1-13 terminal with serial number 19 in Table 1 as an example, the control circuit diagram of the Areva knife switch is as follows: Figure 5 As shown:

[0081] (1) If the circuit is intact and the opening button SB1 is pressed, the control circuit is connected during the knife switch opening process. After the knife switch is fully opened, the travel contact is disconnected and the control circuit is disconnected;

[0082] (2) If the self-holding circuit fails and the opening button SB1 is pressed, the control circuit is only turned on when the opening button is pressed, and the control circuit is disconnected when the opening button is released;

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

[0084] In order to identify the above three working conditions, XT1-13 must have a pre-trigger function, that is, the diagnostic system collects the node voltage of the XT1-13 terminal in real time and stores it in the preset first storage space with RX_A as the initial position. When the accumulated length reaches 200ms of voltage data, the voltage data at the next moment is placed in the preset second storage space with RX_A as the initial position and refreshed continuously, and its effective value is calculated at the same time. The effective value calculated before pressing the trip button is about 0V. Once the trip button is pressed and the circuit is turned on, the calculated voltage effective value will be greater than 220*80%V. The calculated voltage effective value greater than 220*80%V is used as a trigger, and the next 2s voltage data is written in the second storage space with RX_B as the first address, thus realizing the pre-trigger function.

[0085] For the above three working conditions: (1) If no trigger signal is received, it means that the circuit is blocked and the fault occurs on the power supply side of the XT1-13 node; (2) If the trigger signal is received, the effective value of the voltage in the first 200ms is 220V±20%, and the effective value of the voltage in the last 2s is less than 220V±20%, which means that the self-holding circuit is faulty; (3) If the trigger signal is received, the effective value of the voltage in the first 200ms and the effective value of the voltage in the last 2s are both 220V±20%, which means that the circuit is intact. The terminals numbered 17, 18, and 20 in Table 1 are similar to the terminal numbered 19.

[0086] In a specific embodiment, the client is used to send opening and closing remote control signals to the measurement and control screen; generate and display the corresponding knife switch fault report based on the relevant information of the terminal to be tested with problems; the fault point report includes the terminal number corresponding to the fault point, the detection location, the fault basis and the operating fault component status.

[0087] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A switch operation condition confirmation and circuit fault diagnosis system, characterized in that: include: Voltage collection device and intelligent operation and maintenance platform; The voltage acquisition device is embedded and installed in the knife switch terminal box and the mechanism box, and the terminals to be tested of the terminal blocks of the knife switch terminal box and the mechanism box are plugged with terminal block probes; the input end of the voltage acquisition device is connected to the terminal block probe; the voltage acquisition device is used to collect the node voltage of each terminal to be tested of the terminal block; The intelligent operation and maintenance platform is respectively communicated with the knife switch control circuit and the voltage acquisition device, and is used to send the opening and closing remote control signal to the knife switch control circuit; receive the node voltage of the terminal to be tested acquired by the voltage acquisition device, and respond to the knife switch mode request to determine whether the degree of deviation between the node voltage of each terminal to be tested and the normal voltage meets the preset deviation threshold; if not, it is determined that the knife switch operation conditions are not met or there is a circuit fault problem at the terminal to be tested, and a knife switch fault report is generated.

2. A switch operation condition confirmation and circuit fault diagnosis system according to claim 1, characterized in that: The terminal block probe includes one or more monolithic probing structures; The monolithic detection structure comprises fixing screws, wires, metal sheets, upper and lower telescopic pins and a T-shaped fixed insulating seat; The fixing screws are used to fix the connecting wires, the metal sheet and the T-shaped fixing insulating seat in sequence; The upper and lower telescopic pins are arranged on both sides of the metal sheet, and the upper and lower telescopic pins pass through the T-shaped fixed insulating seat and the terminal to be tested.

3. A switch operation condition confirmation and circuit fault diagnosis system according to claim 2, characterized in that: One end of the wire has a circular ring structure, the circular ring structure is passed through by the fixing screw, and is connected with the metal sheet and the fixing screw by spot welding.

4. A switch operation condition confirmation and circuit fault diagnosis system according to claim 3, characterized in that: The T-shaped fixed insulating seat includes a transverse fixing portion and upper and lower guiding square columns; Both sides of the transverse fixing portion are provided with assembly guide fixing holes; The upper and lower guiding square columns are provided with multi-stage buckles adapted to the body structure of the terminal to be tested.

5. A switch operation condition confirmation and circuit fault diagnosis system according to claim 1, 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. A switch operation condition confirmation and circuit fault diagnosis system according to claim 1, characterized in that: The intelligent operation and maintenance platform includes a communication-connected server and a client; The server is connected to the voltage acquisition device through a smart gateway; The client is connected to a measurement and control screen via an Ethernet switch, and the measurement and control screen is communicatively connected with the knife switch control circuit.

7. A switch operation condition confirmation and circuit fault diagnosis system according to claim 6, characterized in that: The service end and the voltage acquisition device realize data communication based on the Modbus transmission protocol.

8. A switch operation condition confirmation and circuit fault diagnosis system according to claim 7, characterized in that: The server is used to: Store the serial number of each terminal to be tested and its corresponding normal state data under different switch modes; receive the node voltage of the terminal to be tested collected by the voltage collection device; wherein the normal state data includes the normal voltage of the terminal to be tested and the normal operation component state; Determine whether the received node voltage of the terminal to be tested is associated with the control terminal that starts the motor to rotate; If not associated, in response to the knife switch mode request, determine in real time the degree of deviation between the node voltage of the terminal to be tested and the normal voltage in the associated knife switch mode; if the degree of deviation is greater than a preset deviation threshold, confirm that the terminal to be tested does not meet the knife switch operation conditions or has a circuit breaker fault problem; If associated, the node voltage of the associated terminal to be tested is stored in real time. In response to the knife switch mode request, it is determined whether the stored node voltage of the terminal to be tested meets the trigger condition and whether the degree of deviation between the node voltage of the terminal to be tested and the normal voltage under the associated knife switch mode meets the preset deviation threshold. If not, it is determined that there is a circuit fault problem in the terminal to be tested.

9. A switch operation condition confirmation and circuit fault diagnosis system according to claim 8, characterized in that: The server is specifically used to, if associated, store the node voltage of the associated terminal to be tested in a preset first storage space and store it for a preset first time length, and cyclically cover it, and at the same time extract and calculate the first voltage effective value of the node voltage from the first storage space; In response to the switch mode request, when the effective value of the first voltage reaches the trigger voltage, the node voltage of the associated terminal to be tested currently received is stored in the preset second storage space and the storage continues for the preset second time period, and the second voltage effective value of the node voltage is extracted and calculated from the first storage space; it is determined whether the deviation degree of the first voltage effective value that continues for the preset first time period and the second voltage effective value that continues for the preset second time period from the normal voltage meets the preset deviation threshold, if not, it is determined that the terminal to be tested has a circuit fault problem; when the first voltage effective value continues to fail to reach the trigger voltage, it is determined that the terminal to be tested has a circuit fault problem; The relevant information of the terminal to be tested having problems is sent to the client.

10. A switch operation condition confirmation and circuit fault diagnosis system according to claim 9, characterized in that: The client is used to send a remote control signal for opening and closing the switch to the measurement and control screen; generate and display a corresponding switch fault report based on relevant information of the terminal to be tested with a problem; the fault point report includes the terminal number corresponding to the fault point, the detection location, the fault basis and the operating fault component status.

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