A method for establishing an inflatable cabinet based on characteristic monitoring and control functions

Abstract

The present application discloses a method for establishing an inflatable cabinet based on characteristic monitoring and control functions, including: monitoring the characteristic data of the circuit breaker through the circuit breaker mechanical characteristic sensor; preprocessing the monitored characteristic data to obtain the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve; inputting the characteristic points in the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve into the circuit breaker mechanical characteristic performance evaluation model for analysis and judgment of abnormal conditions; and realizing the conversion of different states through one-button sequential control. Through the one-button sequential control control method, the current operating status and characteristic data of the inflatable cabinet can be dynamically grasped, while improving the reliability, stability and safety of the inflatable cabinet operation, optimizing the configuration of operation and maintenance personnel and operation and inspection plans, and significantly improving the economy of substation operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of switch cabinets, and in particular relates to a method for establishing an inflatable cabinet based on characteristic monitoring and control functions. Background Art

[0002] With the continuous development of power systems and computer technology, the requirements for inflatable cabinets are also constantly increasing. As one of the most commonly used equipment in the power field, the reliability, operability and safety of power switchgear will directly affect the safe operation and fault prevention of the power system. In addition, inflatable cabinets are one of the key development directions of power transmission and distribution equipment due to their excellent characteristics such as maintenance-free and miniaturization.

[0003] However, traditional gas charging cabinets can no longer adapt to the construction requirements of digital power grids and digital equipment under the construction of new power systems due to their low operation and maintenance efficiency and difficulty in remote inspections. In addition, the monitoring system of existing gas charging cabinets has not been intelligentized, and it is impossible to dynamically grasp the current real-time operating status and characteristic data of the gas charging cabinet. Summary of the invention

[0004] In order to solve the above technical problems, this application proposes the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides a method for establishing an inflatable cabinet based on characteristic monitoring and control functions, including:

[0006] The characteristic data of the circuit breaker is monitored by the circuit breaker mechanical characteristic sensor;

[0007] Pre-process the monitored characteristic data to obtain the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve;

[0008] The characteristic points in the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve are respectively input into the circuit breaker mechanical characteristic performance evaluation model for analysis and abnormal conditions are judged;

[0009] The conversion of different states is achieved through one-button sequential control.

[0010] In a possible implementation, monitoring characteristic data of the circuit breaker by using a circuit breaker mechanical characteristic sensor includes:

[0011] Through the built-in mechanical characteristic sensor, the circuit breaker's opening and closing coil current, opening and closing time, opening and closing speed, opening and closing status, bounce amplitude and time, three-phase closing phase, three-phase opening phase, energy storage time, energy storage motor current, energy storage times and operation times are obtained respectively;

[0012] Monitor the acquired data.

[0013] In a possible implementation, preprocessing the monitored characteristic data to obtain the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve includes:

[0014] Processing discrete signals obtained by the embedded mechanical property sensor;

[0015] The filtering algorithm and the linear fitting algorithm are used to fit the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve.

[0016] In a possible implementation, characteristic points of the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve are respectively input into the circuit breaker mechanical characteristic performance evaluation model for analysis and abnormal conditions are judged, including:

[0017] The abnormal coil voltage, abnormal tripping action, damage to the auxiliary switch, changes in the mechanical state and degradation of its performance during the operation of the circuit breaker can be judged through the characteristic points in the circuit breaker opening and closing coil current-time curve;

[0018] The gear wear, chain disengagement, spring fatigue failure and defects of the energy storage motor are judged through the current-time curve of the energy storage motor.

[0019] In a possible implementation, judging the abnormal coil voltage, abnormal tripping action, damage to the auxiliary switch, and mechanical state change and performance degradation during the circuit breaker operation by using characteristic points in the circuit breaker opening and closing coil current curve includes:

[0020] The opening and closing coil is energized at the first moment, and there is current in the coil. The electromagnetic force generated by the electromagnet is smaller than the action value of the iron core, and the iron core does not move;

[0021] At the second moment, the electromagnetic force generated by the closing and opening coil current overcomes the core's own gravity, motion friction, and spring reaction resistance to drive the core to move;

[0022] At the second moment, the opening and closing holding latch is released, the circuit breaker body starts to move, the iron core moves to the position and remains in place, and the current in the coil starts to rise at the same time, until the third moment, when the current rises to the steady-state value;

[0023] At the fourth moment, the auxiliary contact of the circuit breaker disconnects the DC power supply, and the iron core is reset until the current is zero, and the closing and opening process is completed;

[0024] Extract characteristic points from the current-time curve of the circuit breaker opening and closing coil, and judge the abnormal coil voltage, abnormal tripping action, damage to the auxiliary switch, mechanical state change and performance degradation during the circuit breaker operation according to the value of the characteristic points, the relationship between the characteristic points and the relationship between the characteristic values ​​of the factory test curve; when the time period from the fourth moment to the moment when the current is zero is greater than or equal to the preset value of the factory test curve, and the moment when the current is zero is greater than the preset value of the factory test curve moment, it indicates that the auxiliary switch action and switching are abnormal or the tripping action is abnormal, and personnel maintenance is required;

[0025] When the time and current values ​​in the circuit breaker opening and closing coil current curve are greater than or equal to the factory test curve of the preset value, it indicates that the coil power supply voltage has an overvoltage abnormality;

[0026] When the time and current values ​​in the circuit breaker opening and closing coil current curve are less than or equal to the preset factory test curve, it indicates that the coil power supply voltage has a low voltage abnormality.

[0027] In a possible implementation, judging the gear wear, chain tripping, spring fatigue failure and defect of the energy storage motor by the energy storage motor current-time curve includes:

[0028] In the first stage, the motor is started without load, and the changes in the operating power supply and the armature resistance of the energy storage motor are reflected according to the peak value of the motor's starting current;

[0029] In the second stage, the current is stable and the motor starts to rotate;

[0030] In the third stage, the energy storage motor pulls the closing spring to do work, and the current slope reflects the speed of load increase, the flexibility of the energy storage shaft, and the spring stiffness.

[0031] In the fourth stage, during the stretching process of the energy storage spring, the spring force increases, the force arm of the energy storage shaft decreases, the torque decreases, and the motor current decreases. At the end of the fourth stage, the spring is in place and reaches the expected position;

[0032] In the fifth stage, after the spring reaches the expected position, the motor load decreases and the motor current begins to decrease until the end of the fifth stage, when the motor current micro switch cuts off the energy storage motor current and the energy storage process ends;

[0033] Extract characteristic points from the energy storage motor current-time curve, and judge the faults and defects such as gear wear, chain disengagement, spring fatigue, etc. of the energy storage motor according to the value of the characteristic points, the relationship between the characteristic points, and the relationship with the characteristic value of the factory test curve;

[0034] When the third stage time is greater than or equal to the factory test curve of the preset value, it indicates that the gear of the energy storage motor is worn and needs to be repaired;

[0035] When the fourth stage time is less than the preset value of the factory test curve, it indicates that the energy storage spring is fatigued and needs to be repaired.

[0036] In a possible implementation, the conversion of different states is realized by one-button sequential control, including: hot standby in one-button sequential control, cold standby in one-button sequential control, one-button maintenance in one-button sequential control, and one-button power transmission in one-button sequential control;

[0037] The one-button sequential control to the hot standby state includes:

[0038] When the power monitoring system issues a one-button power outage to hot standby command, the circuit breaker is judged to be in the closed position;

[0039] If the circuit breaker is in the closed position, the conditions of the live display state, the three-position isolating switch being in the on state, the comprehensive protection device having no alarm or abnormality, and the front and rear door travel switches being closed are judged;

[0040] After the judgment is passed, the circuit breaker is opened, and at the same time, the conditions that the three-position isolating switch is in the on position, the electric controller has no alarm, and the front and rear door travel switches are closed are judged;

[0041] After the judgment is passed, one-click power-on switches to the hot standby position and the instruction is completed.

[0042] In a possible implementation, the one-key sequential control switches to the cold standby state, including:

[0043] The power monitoring system issues a one-button power outage and cold standby command;

[0044] Determine the conditions under which the circuit breaker is in the closed position;

[0045] If the circuit breaker is in the closed position, the conditions of the live display state, the three-position isolating switch being in the on state, the comprehensive protection device having no alarm or abnormality, and the front and rear door travel switches being closed are judged;

[0046] After the judgment is passed, the circuit breaker is opened, and the condition that the three-position disconnector is in the conducting position is judged at the same time;

[0047] If the three-position isolating switch is in the on position, the conditions that the circuit breaker is in the open state, the three-position isolating switch is in the on position, the electric controller has no alarm, and the front and rear door travel switches are closed are judged;

[0048] After the judgment is passed, turn the three-position isolation switch to the isolation position, and the power outage to cold standby instruction is completed with one button.

[0049] In a possible implementation, the one-key sequential control is transferred to the one-key maintenance state, including:

[0050] The power monitoring system issues a one-button power outage and maintenance command to determine whether the circuit breaker is in the closed position;

[0051] If the circuit breaker is in the closed position, the conditions of the live display state, the three-position isolating switch being in the on state, the comprehensive protection device having no alarm or abnormality, and the front and rear door travel switches being closed are judged;

[0052] After the judgment is passed, the circuit breaker is opened, and the condition that the three-position disconnector is in the on state is judged at the same time;

[0053] If the three-position isolating switch is in the on position, the conditions that the circuit breaker is in the open state, the three-position isolating switch is in the on position, the electric controller has no alarm, and the front and rear door travel switches are closed are judged;

[0054] After the judgment is passed, the three-position isolating switch is rotated to the isolating position, and at the same time, the opening state of the circuit breaker, the absence of alarm from the electric controller, the closing of the front and rear door travel switches, and the conditions of the dot display are judged;

[0055] After the judgment is passed, turn the three-position isolating switch to the grounding position, and the power is cut off with one button and the command is completed by switching to the maintenance position.

[0056] In a possible implementation, the one-key sequential control is switched to the one-key power-on state, including:

[0057] After the power monitoring system issues a one-button power supply command, it determines the condition that the three-position disconnector is in the grounding position;

[0058] If the three-position isolating switch is in the grounding position, the circuit breaker is in the open state, the electric controller has no alarm, the front and rear door travel switches are closed, and the power display conditions are judged;

[0059] After the judgment is passed, the three-position isolating switch is rotated to the isolating position, and at the same time, the circuit breaker is in the open state, the electric controller has no alarm, the front and rear door travel switches are closed, and the dot display state conditions are judged;

[0060] After the judgment is passed, the three-position isolating switch is turned to the on position, and the conditions for the circuit breaker to be in the off state are judged at the same time;

[0061] If the circuit breaker is in the open state, the three-position isolating switch is in the conducting position, the comprehensive protection device has no alarm, the front and rear door travel switches are closed, and there is no abnormality in the circuit, and the conditions that meet the locking requirements are judged;

[0062] After the judgment is passed, the circuit breaker is closed and the power supply command is completed with one click.

[0063] Compared with the prior art, the beneficial effects of this application are:

[0064] Based on the traditional gas charging cabinet, this application introduces various sensors, monitoring modules, human-machine interaction interfaces and other equipment to realize the monitoring of the mechanical characteristics of the circuit breaker of the gas charging cabinet, the current-carrying characteristics of the switch cabinet, the insulation characteristics of the switch cabinet, the gas density and the one-key sequential control control method of the gas charging cabinet, so as to dynamically grasp the current operating status and characteristic data of the gas charging cabinet, improve the reliability, stability and safety of the gas charging cabinet operation, optimize the configuration of operation and maintenance personnel and operation and inspection plans, and significantly improve the economy of substation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 A schematic diagram of the structure of the inflatable cabinet provided in an embodiment of the present application;

[0066] Figure 2 A schematic diagram of a structural component of an embedded mechanical property sensor provided in an embodiment of the present application;

[0067] Figure 3 A flowchart of a method for establishing an inflatable cabinet based on characteristic monitoring and control functions provided in an embodiment of the present application;

[0068] Figure 4 A current-time curve of the circuit breaker opening and closing coil provided in an embodiment of the present application;

[0069] Figure 5 The current-time curve of the energy storage motor provided in the embodiment of the present application;

[0070] Figure 6 A flowchart of a one-key sequential control to a hot standby state provided in an embodiment of the present application;

[0071] Figure 7 A flowchart of a one-key sequential control to a cold standby state provided in an embodiment of the present application;

[0072] Figure 8 A flowchart of a one-key sequential control to a one-key maintenance state provided in an embodiment of the present application;

[0073] Fig. 9 A flow chart of the one-key sequential control to the one-key power supply state provided in an embodiment of the present application.

[0074] in, Figure 1-9 The symbols in the figure are as follows: 1-cabinet, 2-instrument room, 3-mechanism room, 4-cable room, 5-busbar room, 6-gas box, 7-human-machine interface, 8-digital protection device, 9-monitoring module, 10-gas density meter, 11-electric three-position disconnector, 12-circuit breaker, 13-structural part with embedded mechanical property sensor, 14-cable cone, 15-cable terminal head, 16-partial discharge sensor. DETAILED DESCRIPTION

[0075] The present solution is described below in conjunction with the accompanying drawings and specific implementation methods.

[0076] Figure 1 For a schematic diagram of the structure of the inflatable cabinet provided in the embodiment of the present application, see Figure 1 The inflatable cabinet in this embodiment includes: a cabinet body 1, wherein an instrument room 2, a mechanism room 3, a cable room 4, a busbar room 5 and a gas box 6 are arranged in the cabinet body 1, a human-machine interaction interface 7, a digital protection device 8 and a monitoring module 9 are arranged in the instrument room 2, a gas density meter 10, an electric three-position isolating switch (with a double confirmation micro switch) 11, a circuit breaker 12 and a structural member 13 with an embedded mechanical property sensor are installed on the main shaft section of the circuit breaker 12, a cable cone 14 is arranged in the gas box 6, a cable terminal head 15 is arranged in the cable room 4, the temperature sensor and the cable cone 14 and the cable terminal head 15 are designed by integration and embedded in the interior, and a partial discharge sensor 16 is adsorbed on the side wall of the mechanism room 3 or the cable room 4.

[0077] The embedded mechanical characteristic sensor and the circuit breaker main shaft adopt a fusion design, and the central opening of the main shaft section is used to install a structural part with an embedded mechanical characteristic sensor. This design can monitor the circuit breaker characteristic data without affecting the mechanical life of the product. In this embodiment, the embedded mechanical characteristic sensor is an angular displacement measurement sensor, and different types of sensors can be selected according to their sizes, such as magnetic induction sensors, infrared sensors, and optical encoder sensors.

[0078] Figure 2 This is a schematic diagram of a structural component of an embedded mechanical property sensor provided in an embodiment of the present application. The structural component of the embedded mechanical property sensor has threads on the inner side, and the embedded mechanical property sensor is reliably fixed in the structural component through a sealing process.

[0079] The human-machine interaction interface 7 displays the circuit breaker characteristic data, circuit breaker opening and closing coil current-time curve, circuit breaker contact travel-time curve, energy storage motor current-time curve, and whether the circuit breaker opening and closing data are within the permitted range.

[0080] Figure 3 A flow chart of a method for establishing an inflatable cabinet based on characteristic monitoring and control functions provided in an embodiment of the present application, see Figure 3 In this embodiment, a method for establishing an inflatable cabinet based on characteristic monitoring and control functions includes:

[0081] S101, monitoring characteristic data of the circuit breaker through a circuit breaker mechanical characteristic sensor.

[0082] In this embodiment, characteristic data of the circuit breaker are obtained respectively through the embedded mechanical characteristic sensor, and the circuit breaker characteristic data at least include: opening and closing coil current, opening and closing time, opening and closing speed, contact opening distance, overtravel, full contact stroke, bounce amplitude and time, three-phase closing in different periods, three-phase opening in different periods, energy storage time, energy storage motor current, energy storage times, operation times, three-phase current, opening and closing status, and the obtained multiple data are monitored.

[0083] S102, pre-processing the monitored characteristic data to obtain a circuit breaker opening and closing coil current-time curve and an energy storage motor current-time curve.

[0084] In this embodiment, the discrete signal obtained by the embedded mechanical characteristic sensor is processed, and the current-time curve of the circuit breaker opening and closing coil and the current-time curve of the energy storage motor are obtained by fitting through a filtering algorithm and a linear fitting algorithm.

[0085] S103, inputting characteristic points in the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve into the circuit breaker mechanical characteristic performance evaluation model for analysis and judging abnormal conditions.

[0086] In this embodiment, the abnormal coil voltage, abnormal tripping action, damage to the auxiliary switch, changes in the mechanical state, and degradation of its performance during the circuit breaker operation are judged by the characteristic points in the circuit breaker opening and closing coil current-time curve. Figure 4 The circuit breaker closing coil current-time curve provided in the embodiment of the present application, the characteristic points of the circuit breaker closing coil current curve characterize the mechanical state change during the circuit breaker operation process, and the circuit breaker closing coil current curve is a dynamic curve of the electromagnet movement process, which is affected by the switching of the auxiliary switch. The action process of the electromagnet can be divided into the following stages:

[0087] In stage 1, i.e. the time period from 0 to T1, the closing and opening coil is energized after time 0, and current flows through the coil, but the electromagnetic force generated by the electromagnet does not reach the action value to move the iron core, and the iron core does not move.

[0088] Phase 2 is the time period from T1 to T2. At T1, the electromagnetic force generated by the closing and opening coil current can overcome the resistance of the core's own gravity, movement friction, spring reaction force, etc. to drive the core to move. During the movement of the core, it hits the latch, releasing the closing and opening latch, and the circuit breaker body begins to move.

[0089] Phase 3 is the time period from T2 to T3. At T2, the iron core moves to the position and remains there. Since the iron core of the release is in a static position, the current in the coil begins to rise until T3, when the current rises to a steady-state value.

[0090] Phase 4 is the time period from T3 to T4. At T4, the auxiliary contact of the circuit breaker disconnects the DC power supply, and the iron core is reset until the current is zero, and the closing and opening process is completed.

[0091] The characteristic values ​​T1, T2, T3, T4, T5, I1, I2 and I3 in the current-time curve of the circuit breaker opening and closing coil are extracted, and according to the size of the characteristic values, the relationship between the characteristic values, and the relationship with the characteristic values ​​of the factory test curve, the faults and defects that affect the switch refusal to open, refusal to close, and coil burning, such as whether the power supply voltage is abnormal, whether the release action is abnormal, whether the switch transmission system is abnormal, whether the auxiliary switch action and switching are abnormal, are judged.

[0092] When the time period from the fourth moment to the moment when the current is zero is greater than or equal to 1.35 times the factory test curve, and the moment when the current is zero is greater than 1.2 times the moment of the factory test curve, it can be characterized that there is an abnormality in the action and switching of the auxiliary switch or the action of the release is abnormal, and personnel maintenance is required. When the moment and current value in the current curve of the circuit breaker opening and closing coil are greater than or equal to 1.05 times the factory test curve, it can be characterized that the coil power supply voltage has an overvoltage abnormality. When the moment and current value in the current curve of the circuit breaker opening and closing coil are less than or equal to 0.9 times the factory test curve, it can be characterized that the coil power supply voltage has a low voltage abnormality. When the moment does not change much compared to the factory test curve, but the current value is greater than 1.667 times the factory test curve, it indicates that there is a risk of inter-turn short circuit in the opening and closing coil.

[0093] Secondly, the gear wear, chain tripping, spring fatigue failure and defects of the energy storage motor are judged through the energy storage motor current-time curve. Figure 5 , the energy storage motor-time curve provided in the embodiment of the present application, wherein,

[0094] In the stage of t0~t1, the motor is energized and starts without load. The starting current peak value Ist of the motor can directly reflect the changes of the operating power supply and the armature resistance of the energy storage motor.

[0095] During the t1-t2 phase, the current is stable and the motor starts to rotate. Since the pin on the energy storage sprocket has not yet driven the slider fixed on the energy storage shaft to stretch the spring to do work, the motor rotates without load. The current gradually stabilizes, and the current value is affected by the operating power supply and the coil resistance inside the motor.

[0096] During the t2-t3 stage, the motor performs work, the energy storage motor pulls the closing spring to perform work, and the current changes with the increase of the load. At this time, the current slope can reflect the speed of the load increase, and indirectly reflect the flexibility of the energy storage shaft and the spring stiffness state.

[0097] During the t3-t4 stage, although the spring force increases during the stretching process of the energy storage spring, its force arm for the energy storage axis decreases, its torque decreases, and the motor current drops. At t4, the spring is in place and reaches the expected position.

[0098] In the stage of t4-t5, after the spring reaches the expected position, the motor load decreases and the motor current begins to decrease until the moment t5, when the motor current micro switch cuts off the energy storage motor current and the energy storage process ends.

[0099] The characteristic values ​​t0, t1, t2, t3, t4, t5, Ist, Ia, and Im in the current-time curve of the energy storage motor are extracted, and the faults and defects such as gear wear, chain disengagement, and spring fatigue of the energy storage motor are judged based on the size of the characteristic values, the relationship between the characteristic values, and the relationship with the characteristic values ​​of the factory test curve.

[0100] When the third stage time is greater than or equal to 1.15 times the factory test curve, it can be indicated that the energy storage motor gear is worn and needs to be repaired. When the fourth stage time is less than 0.85 times the factory test curve, it can be indicated that the energy storage spring is fatigued and needs to be repaired.

[0101] In addition, the performance evaluation model of the mechanical characteristics of the circuit breaker can also be realized by analyzing the characteristic points of the circuit breaker contact travel-time curve. The characteristic points include: just-closed and opened points, overshoot and rebound amplitude, etc., and according to the size of the characteristic values, the relationship between them, and the relationship with the characteristic values ​​of the factory test curve, it is possible to judge faults and defects such as abnormal oil buffering, transmission mechanism jamming, spring fatigue, etc. The three-phase closing and opening of the three-phase circuit breaker at different times can be realized by analyzing the just-closed and opened points of the three phases. The three-phase current can be combined with physical quantities such as arcing time, and the thermal aging model of the conductive and insulating parts in the arc extinguishing chamber can be used to guide the electrical life analysis of the circuit breaker.

[0102] In this embodiment, the current-carrying characteristics of the switch cabinet are monitored through a temperature sensor, which can be integrated with the cable terminal head, the cable cone, or the nuts, nuts, and bolts of the copper busbar. Since the insulation static distance in the inflatable cabinet is small, the temperature sensor is usually not installed in an exposed or bundled manner. Even if it is installed in a bundled manner, it should be considered whether the installation position will damage the insulation performance of the entire cabinet. In this embodiment, the temperature sensor can use wireless communication, the communication frequency band should be exempted from application, and each sensor has a unique ID identification number to facilitate the temperature status of each monitoring point. Carefully select a temperature measurement solution using wired communication methods such as optical fiber temperature measurement or thermocouple temperature measurement.

[0103] Preferably, the temperature sensor can be powered by a built-in battery, induction current, induction voltage, RFID, or surface acoustic wave. The alarm threshold of the device temperature data can be determined on demand to analyze and determine whether the switch cabinet temperature data is within the permitted range.

[0104] In addition, the switch cabinet can be equipped with a temperature and humidity sensor. By collecting the ambient temperature and humidity, it can be analyzed to determine whether the temperature rise data of the switch cabinet is within the permitted range. Combined with the three-phase current value, the ambient temperature and humidity, the operating time, and the heat dissipation performance of the switch cabinet, a dynamic temperature rise analysis and judgment based on the load current is performed. The temperature data of the monitoring point, the temperature rise data, the temperature-time curve, the temperature-time-current curve, and the current-carrying characteristic data of the switch cabinet are displayed and analyzed through the human-computer interaction interface7 to determine whether they are within the permitted range.

[0105] In this embodiment, the switch cabinet insulation characteristic monitoring can be realized by monitoring the sound, light, and electric signals when the switch cabinet partial discharge is generated, and can also be realized by a high-frequency current sensor, and can also be realized by a coupling capacitor sensor. When it is realized by monitoring the sound, light, and electric signals when the switch cabinet partial discharge is generated, an audio sensor or an ultrasonic sensor can be configured for the sound wave signal, an arc probe or a high-speed camera can be configured for the ultraviolet light or visible light signal, and a UHF sensor or a transient ground wave sensor can be configured for the electromagnetic wave signal.

[0106] When the insulation characteristics of the switch cabinet are monitored by a high-frequency current sensor, the sensor mainly monitors the partial discharge conditions near the cable, cable terminal head, and cable cone.

[0107] When the insulation characteristics of the switch cabinet are monitored through the coupling capacitance sensor, the sensor can be shared with the live indicator. When the partial discharge of the whole cabinet is abnormal, the leakage current amplitude, period and other parameters are mainly monitored.

[0108] The partial discharge sensor 16 in the embodiment of the present application can be one or a combination of an audio sensor, an ultrasonic sensor, an arc probe, a high-speed camera ultra-high frequency sensor, a transient ground wave sensor, and a high-frequency current sensor, and the alarm threshold is set to analyze and determine whether the partial discharge data is within the permitted range. Before the above sensors are put into operation on site, they should be calibrated according to the background noise or background radiation or lighting conditions to improve the monitoring reliability and reduce the false alarm rate.

[0109] S104, realize the conversion of different states through one-button sequential control.

[0110] In this embodiment, the one-button sequential control mainly has four final states: one-button power supply, hot standby, cold standby, and one-button maintenance. Among them, the flowchart of the one-button sequential control turning to the hot standby state is as follows Figure 6As shown, when the power monitoring system issues a one-button power-off command to transfer to hot standby, the state of the circuit breaker in the closed position is judged. If the circuit breaker is in the closed position, the conditions of the live display state, the three-position disconnector in the on state, the comprehensive protection device without any alarm or abnormality, and the front and rear door travel switches being closed are judged. After the judgment is passed, the circuit breaker is opened, and at the same time, the conditions of the three-position disconnector in the on position, the electric controller without alarm, and the front and rear door travel switches being closed are judged. After the judgment is passed, the power is turned on to the hot standby position with one button, and the command is completed.

[0111] See also Figure 7 , a flowchart of a one-button sequential control to cold standby state provided in an embodiment of the present application, the power monitoring system issues a one-button power-off to cold standby command, and judges the condition that the circuit breaker is in the closed position. If the circuit breaker is in the closed position, the conditions that the energized display state, the three-position isolating switch is in the on state, the comprehensive protection device has no alarm and abnormality, and the front and rear door travel switches are closed are judged. After the judgment is passed, the circuit breaker is opened, and the condition that the three-position isolating switch is in the on position is judged at the same time. If the three-position isolating switch is in the on position, the circuit breaker is in the open state, the three-position isolating switch is in the on position, the electric controller has no alarm, and the front and rear door travel switches are closed are judged. After the judgment is passed, the three-position isolating switch is rotated to the isolation position, and the one-button power-off to cold standby command is completed.

[0112] See also Figure 8 , a flowchart of a one-key sequential control state transferred to a one-key maintenance state provided in an embodiment of the present application, the power monitoring system issues a one-key power-off-to-maintenance instruction, and judges whether the circuit breaker is in the closed position. If the circuit breaker is in the closed position, the conditions of the live display state, the three-position isolating switch in the on state, the comprehensive protection device without any alarm and abnormality, and the front and rear door travel switches being closed are judged. After the judgment is passed, the circuit breaker is opened, and at the same time, the conditions of the three-position isolating switch in the on state are judged. If the three-position isolating switch is in the on position, the conditions of the circuit breaker in the open state, the three-position isolating switch in the on position, the electric controller without an alarm, and the front and rear door travel switches being closed are judged. After the judgment is passed, the three-position isolating switch is rotated to the isolation position, and at the same time, the circuit breaker The open state, the electric controller without an alarm, the front and rear door travel switches are closed, and the dot display conditions are judged. After the judgment is passed, the three-position isolating switch is rotated to the grounding position, and the one-key power-off-to-maintenance position instruction is completed.

[0113] See also Fig. 9, a flowchart of the one-key sequential control to the one-key power supply state provided in the embodiment of the present application, after the power monitoring system issues the one-key power supply command, the condition that the three-position isolating switch is in the grounding position is judged, if the three-position isolating switch is in the grounding position, the circuit breaker is in the open state, the electric controller has no alarm, the front and rear door travel switches are closed, and the live display conditions are judged, after the judgment is passed, the three-position isolating switch is rotated to the isolation position, and at the same time, the circuit breaker is in the open state, the electric controller has no alarm, the front and rear door travel switches are closed, and the dot display state conditions are judged, after the judgment is passed, the three-position isolating switch is rotated to the conduction position, and at the same time, the circuit breaker is in the open state. Conditions are judged, if the circuit breaker is in the open state, the three-position isolating switch is in the conduction position, the comprehensive protection device has no alarm, the front and rear door travel switches are closed, and the circuit has no abnormality, and the conditions that meet the locking requirements are judged, after the judgment is passed, the circuit breaker is closed, and the one-key power supply command is completed.

[0114] By introducing a digital protection device 8 (including an arc protection device), the purpose of quickly tripping and alarming the gas cabinet under abnormal working conditions can be achieved, and the full-process precise control of the gas cabinet can be realized. The risk of further expansion of destructive consequences caused by problems such as electrical connection failures, grounding failures, and insulation degradation can be effectively avoided, and related problems can be contained within a certain control range to achieve precise collaborative control. By introducing standard power communication protocols and digital twin models, the communication interface requirements of the online monitoring system are unified, and the real physical world is interconnected with the virtual three-dimensional model to achieve full-domain intelligent interaction between people, machines, objects, environments, and numbers in different operating scenarios and different time scales.

[0115] In the embodiments of the present application, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0116] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0117] The above is only a specific implementation of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for establishing an inflatable cabinet based on characteristic monitoring and control functions, characterized in that: include: The characteristic data of the circuit breaker is monitored by the circuit breaker mechanical characteristic sensor; Pre-process the monitored characteristic data to obtain the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve; The characteristic points in the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve are respectively input into the circuit breaker mechanical characteristic performance evaluation model for analysis and abnormal conditions are judged; The conversion between different states can be realized through one-button sequential control.

2. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 1 is characterized in that: The monitoring of characteristic data of the circuit breaker by the circuit breaker mechanical characteristic sensor includes: Through the built-in mechanical characteristic sensor, the circuit breaker's opening and closing coil current, opening and closing time, opening and closing speed, opening and closing status, bounce amplitude and time, three-phase closing phase, three-phase opening phase, energy storage time, energy storage motor current, energy storage times and operation times are obtained respectively; Monitor the acquired data.

3. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 1 is characterized in that: The monitored characteristic data is preprocessed to obtain the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve, including: Processing discrete signals obtained by the embedded mechanical property sensor; The filtering algorithm and the linear fitting algorithm are used to fit the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve.

4. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 1 is characterized in that: The characteristic points of the circuit breaker opening and closing coil current-time curve and the energy storage motor current-time curve are respectively input into the circuit breaker mechanical characteristic performance evaluation model for analysis and judgment of abnormal conditions, including: The abnormal coil voltage, abnormal tripping action, damage to the auxiliary switch, changes in the mechanical state and degradation of its performance during the operation of the circuit breaker can be judged through the characteristic points in the circuit breaker opening and closing coil current-time curve; The gear wear, chain disengagement, spring fatigue failure and defects of the energy storage motor are judged through the current-time curve of the energy storage motor.

5. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 4 is characterized in that: The abnormal coil voltage, abnormal tripping action, damage to the auxiliary switch, and mechanical state changes and performance degradation during the circuit breaker operation are judged by using characteristic points in the circuit breaker opening and closing coil current curve, including: The opening and closing coil is energized at the first moment, and there is current in the coil. The electromagnetic force generated by the electromagnet is smaller than the action value of the iron core, and the iron core does not move; At the second moment, the electromagnetic force generated by the closing and opening coil current overcomes the core's own gravity, motion friction, and spring reaction resistance to drive the core to move; At the second moment, the opening and closing holding latch is released, the circuit breaker body starts to move, the iron core moves to the position and remains in place, and the current in the coil starts to rise at the same time, until the third moment, when the current rises to the steady-state value; At the fourth moment, the auxiliary contact of the circuit breaker disconnects the DC power supply, and the iron core is reset until the current is zero, and the closing and opening process is completed; Extract characteristic points from the circuit breaker opening and closing coil current-time curve, and judge the abnormal coil voltage, abnormal tripping action, auxiliary switch damage, mechanical state change and performance degradation during the circuit breaker operation according to the value of the characteristic points, the relationship between the characteristic points and the relationship between the characteristic values ​​of the factory test curve; When the time period from the fourth moment to the moment when the current is zero is greater than or equal to the factory test curve of the preset value, and the moment when the current is zero is greater than the moment of the factory test curve of the preset value, it indicates that the action and switching of the auxiliary switch are abnormal or the action of the release is abnormal, and personnel maintenance is required; When the time and current values ​​in the circuit breaker opening and closing coil current curve are greater than or equal to the factory test curve of the preset value, it indicates that the coil power supply voltage has an overvoltage abnormality; When the time and current values ​​in the circuit breaker opening and closing coil current curve are less than or equal to the preset factory test curve, it indicates that the coil power supply voltage has a low voltage abnormality.

6. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 4 is characterized in that: The method of judging the gear wear, chain tripping, spring fatigue failure and defects of the energy storage motor by using the energy storage motor current-time curve includes: In the first stage, the motor is started without load, and the changes in the operating power supply and the armature resistance of the energy storage motor are reflected according to the peak value of the motor's starting current; In the second stage, the current is stable and the motor starts to rotate; In the third stage, the energy storage motor pulls the closing spring to do work, and the current slope reflects the speed of load increase, the flexibility of the energy storage shaft, and the spring stiffness. In the fourth stage, during the stretching process of the energy storage spring, the spring force increases, the force arm of the energy storage shaft decreases, the torque decreases, and the motor current decreases. At the end of the fourth stage, the spring is in place and reaches the expected position; In the fifth stage, after the spring reaches the expected position, the motor load decreases and the motor current begins to decrease until the end of the fifth stage, when the motor current micro switch cuts off the energy storage motor current and the energy storage process ends; Extract characteristic points from the energy storage motor current-time curve, and judge the faults and defects such as gear wear, chain disengagement, spring fatigue, etc. of the energy storage motor according to the value of the characteristic points, the relationship between the characteristic points, and the relationship with the characteristic value of the factory test curve; When the third stage time is greater than or equal to the factory test curve of the preset value, it indicates that the gear of the energy storage motor is worn and needs to be repaired; When the fourth stage time is less than the preset value of the factory test curve, it indicates that the energy storage spring is fatigued and needs to be repaired.

7. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 1 is characterized in that: The conversion of different states is realized through one-button sequential control, including: hot standby in one-button sequential control, cold standby in one-button sequential control, one-button maintenance in one-button sequential control, and one-button power supply in one-button sequential control; The one-button sequential control to the hot standby state includes: When the power monitoring system issues a one-button power outage to hot standby command, the circuit breaker is judged to be in the closed position; If the circuit breaker is in the closed position, the conditions of the live display state, the three-position isolating switch being in the on state, the comprehensive protection device having no alarm or abnormality, and the front and rear door travel switches being closed are judged; After the judgment is passed, the circuit breaker is opened, and at the same time, the conditions that the three-position isolating switch is in the on position, the electric controller has no alarm, and the front and rear door travel switches are closed are judged; After the judgment is passed, one-click power-on switches to the hot standby position and the instruction is completed.

8. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 7 is characterized in that: The one-button sequential control to the cold standby state includes: The power monitoring system issues a one-button power outage and cold standby command; Determine the conditions under which the circuit breaker is in the closed position; If the circuit breaker is in the closed position, the conditions of the live display state, the three-position isolating switch being in the on state, the comprehensive protection device having no alarm or abnormality, and the front and rear door travel switches being closed are judged; After the judgment is passed, the circuit breaker is opened, and the condition that the three-position disconnector is in the conducting position is judged at the same time; If the three-position isolating switch is in the on position, the conditions that the circuit breaker is in the open state, the three-position isolating switch is in the on position, the electric controller has no alarm, and the front and rear door travel switches are closed are judged; After the judgment is passed, turn the three-position isolation switch to the isolation position, and the power outage to cold standby instruction is completed with one button.

9. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 7, characterized in that: The one-key sequential control turns to the one-key maintenance state, including: The power monitoring system issues a one-button power outage and maintenance command to determine whether the circuit breaker is in the closed position; If the circuit breaker is in the closed position, the conditions of the live display state, the three-position isolating switch being in the on state, the comprehensive protection device having no alarm or abnormality, and the front and rear door travel switches being closed are judged; After the judgment is passed, the circuit breaker is opened, and the condition that the three-position disconnector is in the on state is judged at the same time; If the three-position isolating switch is in the on position, the conditions that the circuit breaker is in the open state, the three-position isolating switch is in the on position, the electric controller has no alarm, and the front and rear door travel switches are closed are judged; After the judgment is passed, the three-position isolating switch is rotated to the isolating position, and at the same time, the opening state of the circuit breaker, the absence of alarm from the electric controller, the closing of the front and rear door travel switches, and the conditions of the dot display are judged; After the judgment is passed, turn the three-position isolating switch to the grounding position, and the power is cut off with one button and the command is completed by switching to the maintenance position.

10. The method for establishing an inflatable cabinet based on characteristic monitoring and control functions according to claim 7, characterized in that: The one-key sequential control turns to the one-key power supply state, including: After the power monitoring system issues a one-button power supply command, it determines the condition that the three-position disconnector is in the grounding position; If the three-position isolating switch is in the grounding position, the circuit breaker is in the open state, the electric controller has no alarm, the front and rear door travel switches are closed, and the power display conditions are judged; After the judgment is passed, the three-position isolating switch is rotated to the isolating position, and at the same time, the circuit breaker is in the open state, the electric controller has no alarm, the front and rear door travel switches are closed, and the dot display state conditions are judged; After the judgment is passed, the three-position isolating switch is turned to the on position, and the conditions for the circuit breaker to be in the off state are judged at the same time; If the circuit breaker is in the open state, the three-position isolating switch is in the conducting position, the comprehensive protection device has no alarm, the front and rear door travel switches are closed, and there is no abnormality in the circuit, and the conditions that meet the locking requirements are judged; After the judgment is passed, the circuit breaker is closed and the power supply command is completed with one click.

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