Spare power automatic switching device defect identification method and system based on online data analysis

Abstract

The invention discloses a spare power automatic switching device defect identification method and system based on online data analysis. The method comprises the following steps: step 1, constructing a set spare power automatic switching loop model; step 2, on the basis of the spare power automatic switching model constructed in the step 1, regularly obtaining the input quantity of the spare power automatic switching device and the input quantity of other protection devices in real time online through a protection information system; step 3, based on the input quantity information obtained in the step 2, identifying the defects of the spare power automatic switching device and the loop thereof in the normal operation state, the operation state and the fault state of the power grid by judging the correctness of the input quantity; and step 4, outputting whether the spare power automatic switching device is in a normal state or an abnormal state based on an identification result obtained in the step 3. According to the invention, the hidden risks of the spare power automatic switching device and the loop thereof can be identified and identified to the maximum extent through the voltage and current of the spare power automatic switching device, the switching value acquisition information and the logical judgment information of the spare power automatic switching device and the logical judgment information in combination with other information source data or different states of the power grid.

Description

Technical Field

[0001] The present invention relates to the field of automatic standby device defect identification, and in particular to a method and system for automatic standby device defect identification based on online data analysis. Background Art

[0002] The automatic backup device, full name of which is the automatic backup power supply device, is an automatic protection device used in power systems. Its main function is to quickly and automatically switch the backup power supply to restore power supply when the working power supply fails or loses power, ensuring the continuous operation and power supply reliability of the power system. In the event of a main power failure, the automatic backup device can automatically switch the backup power supply to ensure the continuity and reliability of power supply.

[0003] The correctness, integrity and operational reliability of the backup automatic transfer device and its circuit are of great significance to ensuring reliable power supply in the region. Since the regional 110kV and 35kV high-voltage distribution networks usually adopt a step-by-step power supply mode, when one power supply fails, it is necessary to automatically switch to another power supply through the backup automatic transfer device.

[0004] There are difficulties in real-time status monitoring of the backup automatic start-up device and its circuit. First, the current substation adopts an unmanned operation mode, and the inspection of the backup automatic start-up device relies on manual work. The inspection cycle is relatively long, which is 1-2 weeks, and there is a lag in problem discovery. Second, the inspection precision is not high. The inspection mainly checks the charging status and whether there are alarms. Even if the high standards of maintenance inspection are followed, only the voltage, current collection and switching quantities at the time of inspection are checked. Some invisible defects are difficult to find, such as reverse voltage circuit connection, reverse current circuit connection, reverse tripping circuit connection, etc.

[0005] Therefore, the identification of hidden defects in the automatic start-up device and its circuit can only rely on equipment maintenance, but it also faces problems such as long maintenance cycle and difficulty in timely detection, because the maintenance cycle is usually 6 years. In addition, the automatic start-up device is a cross-interval device. Due to the current requirement for reliable power supply, the maintenance test of the automatic start-up device can usually only be carried out when some intervals are out of service, which makes it difficult to cover all intervals and their circuits, and there are inspection omissions. Summary of the invention

[0006] In order to solve the deficiencies in the prior art, the present invention provides a dedicated defect identification method and system for standby automatic start-up based on online data analysis, which tries to find hidden defects in the standby automatic start-up through online collection and analysis of operating data, ensure the reliable operation of the standby automatic start-up in the event of a power failure, and ensure reliable power supply to the regional power grid.

[0007] The present invention adopts the following technical solution.

[0008] A method for identifying defects of a standby automatic start-up device based on online data analysis comprises the following steps: Step 1: Construct the set backup automatic re-entry loop model; Step 2: Based on the backup automatic start-up model constructed in step 1, the input quantity of the backup automatic start-up device itself and the input quantity of other protection devices are obtained online in real time and regularly through the protection information system; Step 3: Based on the input quantity information obtained in step 2, by judging the correctness of the input quantity, the defects of the backup automatic switching device and its circuit in the normal operation state, operation state and fault state of the power grid are identified; Step 4: Based on the recognition result obtained in step 3, output whether the standby automatic transfer device is in a normal state or an abnormal state.

[0009] The specific acquisition of the input quantity of the backup automatic transfer device itself and the input quantity of other protection devices in step 2 includes: Obtain the voltage, current, switch tripping status, and charging status of the backup automatic transfer device; the current and switch tripping status of the incoming line protection device; and the switch tripping status of the section protection device.

[0010] In step 3, when the power grid is in a normal operating state, the defect identification method of the automatic backup device and its circuit specifically includes: By comparing and judging the incoming current, it is possible to identify whether the standby automatic transfer current sampling is abnormal; by comparing and judging the switch jump status, it is possible to identify whether the standby automatic transfer switch input is abnormal.

[0011] The methods for comparing and judging the incoming line current specifically include: Step A1: Based on the input quantity information obtained in step 2, the incoming current of the standby automatic switching device and the incoming line protection device, first determine that the current values ​​are successfully obtained, and make a preliminary judgment on the current difference. When the difference between the two incoming line currents does not exceed the set proportion of the rated current, it is judged that there is no abnormality; when the difference between the two incoming line currents exceeds the set proportion of the rated current, further online judgment is performed; Step A2: Based on the preliminary judgment result of step A1, further online judgment is performed to compare the current of the backup automatic switching device with the incoming line protection current. If the difference exceeds the threshold value I for N0 consecutive times, d , each time at interval t0, it is judged that the standby self-transfer current sampling is abnormal; among them, N0, I d , t0 is the set value.

[0012] The method for comparing and judging the switch jump state specifically includes: Step B1: Based on the input quantity information obtained in step 2, the switch positions of the standby automatic transfer device and the incoming line protection device, and the switch positions of the standby automatic transfer device and the sectional protection device are obtained at the same time, first determine that the switch positions are successfully obtained, and make a preliminary judgment on the switch position status. If the switch position changes within the set time, it is judged that there is no abnormality; if the switch position does not change within the set time, further judgment is made; Step B2: Based on the preliminary judgment result of step B1, further judgment is made to compare the switch positions of the standby automatic switching device, the incoming line protection device and the section protection device. If the switch positions are inconsistent for N0 consecutive times, each with an interval of t0, it is judged that the input of the standby automatic switching device is abnormal; wherein N0 and t0 are set values.

[0013] In step 3, when the power grid is in operation, the defect identification method of the automatic backup device and its circuit specifically includes: Step C1: Based on the input quantity information obtained in step 2, the voltage, current and switch status of the standby automatic switch, as well as the charge and discharge status of the standby automatic switch, if the incoming line switch jumps from 0 to 1, the judgment ends; if the jumper switch changes from 0 to 1, the next judgment is performed; Step C2: Based on the judgment result of step C1, if the incoming line current corresponding to the switch changes from normal load current to no current, the judgment ends; if it does not change to no current, the current of the backup automatic switching device does not correspond to the switch, and it is judged to be an abnormal state; Step C3: Based on the judgment result of step C1, if the bus voltage corresponding to the switch drops to no voltage, the judgment ends; if it does not drop to no voltage and the bus voltage corresponding to other switches does not drop to 0, the judgment ends; if it does not drop to no voltage and the bus voltage corresponding to other switches drops to 0, the voltage of the standby automatic transfer device does not correspond to the switch, and it is judged to be an abnormal state.

[0014] In step 3, when the power grid is in a fault state, the defect identification method of the backup automatic switching device and its circuit specifically includes: Step D1: Based on the input quantity information obtained in step 2, the incoming line current, incoming line voltage, and bus voltage of the standby automatic switch, the effective values ​​of the voltage and current before and after the start are obtained through the fault recording; Step D2: Based on the voltage and current effective values ​​before and after the start-up obtained in step D1, determine whether the standby automatic start-up device and its circuit are normal according to the corresponding relationship of the mutation amount. If they all meet equations (1), (2) and (3), they are considered normal. If none of them meet the equations, they are also considered normal. If they partially meet the equations, it is considered that the voltage and current do not match and it is considered an abnormal situation. The judgment formula is: (1) (2) (3) In the formula, IL nt0 To prepare for the effective value of the current in line n before automatic starting, IL nt1 It is the effective value of the incoming line current after the automatic start-up. UL nt0The effective value of line n voltage before automatic start-up. UL nt1 It is the effective value of the incoming line voltage after the automatic start-up. U nt0 It is the effective value of bus voltage before the automatic start-up. U nt1 It is the effective value of bus voltage after the backup automatic start-up. I N is the rated current, U N is the rated voltage, e i , e ul 、e u is the coefficient.

[0015] Another aspect of the present invention provides a system for identifying defects of a standby automatic start-up device based on online data analysis, and the method for identifying defects of a standby automatic start-up device based on online data analysis comprises: a standby automatic start-up circuit model building module, an information collection module, a defect identification module, and an output module, and is characterized in that: A standby automatic switching circuit model building module is used to build a set standby automatic switching circuit model; The information acquisition module is connected to the standby automatic switching circuit model construction module, and the standby automatic switching circuit model constructed based on the standby automatic switching circuit model construction module is used to obtain the input of the standby automatic switching device itself and other protection devices online in real time and regularly through the protection information system; The defect recognition module is connected to the information acquisition module and is used to identify the defects of the backup automatic switching device and its circuit by comparing and judging based on the input quantity obtained by the information acquisition module in combination with the operation status of the power grid; The output module is connected to the defect recognition module and is used to determine whether the output standby automatic switching circuit is in a normal state or an abnormal state based on the recognition result obtained by the hidden defect recognition module.

[0016] The defect recognition module includes: a normal operation state defect recognition unit, a power grid operation state defect recognition unit, and a power grid fault state defect recognition unit; The normal operating state defect identification unit is connected to the information acquisition module. Based on the input quantity information acquired by the information acquisition module, the voltage, current, and switch jump status of the standby automatic transfer device, and the current and switch jump status of the incoming line protection device, it is used to identify whether the standby automatic transfer current sampling and switch quantity input are abnormal by judging the correctness of the input quantity; The grid operation state defect identification unit is connected to the information acquisition module, and is used to identify whether the current, voltage and switch of the standby automatic transfer device are consistent with each other by judging the correctness of the input quantity based on the input quantity, the standby automatic transfer voltage, current, switch state and charge and discharge state obtained by the information acquisition module; The power grid fault state defect identification unit is connected to the information acquisition module. Based on the input quantity obtained by the information acquisition module, it compares and judges the incoming line current, incoming line voltage and bus voltage during the power grid fault state to identify whether the voltage and current of the backup automatic transfer device match.

[0017] The normal operation state defect identification unit includes: a current judgment unit and a switch position jump judgment unit; The current judgment subunit is connected to the information acquisition module, and is used to judge the abnormality of the standby automatic transfer current by comparing the current difference based on the input quantity information obtained by the information acquisition module, the current of the standby automatic transfer device, and the incoming line current obtained by the two incoming line protection devices; The switch position jump judgment unit is connected to the information acquisition module. Based on the input information obtained by the information acquisition module, the switch position of the standby automatic transfer device, the incoming line switch position obtained by the two incoming line protection devices, and the segment switch position obtained by the segment protection device, it is used to judge the abnormal jumping situation of the standby automatic transfer switch by comparing the switch position.

[0018] Compared with the prior art, the invention has the following advantages: ① The hidden defects of the backup automatic switching device and its circuit can be identified by combining the real-time acquired voltage, current and switch quantity collection information and its own logical judgment information with other information source data.

[0019] ② Make full use of different states such as changes in grid operation mode, system failures, power switching, etc., and use the real-time acquired voltage and current and switch quantity collection information and its own logical judgment information to maximize the identification of hidden risks of the standby automatic transfer device and its circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A method flow chart of a method for identifying defects of a standby automatic switching device based on online data analysis provided by the present invention; Figure 2 A standby automatic switching device and its circuit model diagram provided by an embodiment of the present invention; Figure 3 A flow chart of a normal operating state defect identification method provided by an embodiment of the present invention; Figure 4 A flow chart of a method for identifying defects in power grid operation states provided by an embodiment of the present invention; Figure 5 A flow chart of a method for identifying fault state defects in a power grid provided by an embodiment of the present invention; Figure 6 This is a system module diagram of a defect identification system for a standby automatic start-up device based on online data analysis provided by the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a method and system for identifying defects in a standby automatic start-up device based on online data analysis, so as to find invisible defects in the standby automatic start-up device through online collection and analysis of operating data as much as possible, ensure reliable operation of the standby automatic start-up device under power failure, and ensure reliable power supply to the regional power grid.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Embodiment 1 like Figure 1 As shown, the present invention provides a method for identifying defects of a standby automatic start-up device based on online data analysis, comprising: Step 1: Construct a set backup automatic switching circuit model, including backup automatic switching device, incoming line protection device, and section protection device; Among them, the automatic standby device in the automatic standby circuit model specifically includes conventional automatic standby devices and intelligent automatic standby devices. The main difference between them lies in the different input and output methods. The conventional automatic standby device uses secondary cables to access voltage, current and switching quantity, and the intelligent automatic standby device uses optical fiber, inputs voltage and current through SV messages, and inputs switching quantity through GOOSE messages.

[0025] In a further preferred but non-limiting embodiment of the present invention, step 1 specifically comprises: Build as Figure 2 The set backup automatic switching circuit model shown in the figure, in which the typical backup automatic switching device is usually an incoming line and segmented backup automatic switching mode, and its input voltage includes: Ⅰ Mother three-phase voltage Ua1, Ub1, Uc1 Ⅱ Bus three-phase voltage Ua2, Ub2, Uc2 Power supply 1 voltage UL1 (not necessarily connected) Power supply 2 voltage UL2 (not necessarily connected) The input current includes: Power supply 1 current IL1 Power supply 2 current IL2 The input switch quantities include: Power supply 1, power supply 2, section switch jump position TWJ1, TWJ2, TWJ3 BSZ automatic total lock No. 1 transformer protection action BS1 No. 2 transformer protection action lockout BS2 If in a certain state the backup automatic transfer device cannot accept normal input due to damage to external relays, travel contacts, secondary circuits or components of the backup automatic transfer device itself, or there is a wiring error in the previous input (such as reverse voltage or current of power supplies 1 and 2), the backup automatic transfer device will refuse to operate or erroneously operate.

[0026] Step 2: Based on the backup automatic start-up model constructed in step 1, the input quantity of the backup automatic start-up device itself and the input quantity of other protection devices are obtained online in real time and regularly through the protection information system; In a further preferred but non-limiting embodiment of the present invention, the other protection devices in step 2 specifically include: line protection and segment protection devices; The step 2 of obtaining the input quantity of the standby automatic transfer device itself and the input quantity of other protection devices specifically includes: obtaining the voltage, current, switch tripping status, and charging status of the standby automatic transfer device; the current and switch tripping status of the incoming line protection device; and the switch tripping status of the segment protection device; Step 3: Based on the input quantity information obtained in step 2, by judging the correctness of the input quantity, the defects of the backup automatic switching device and its circuit in the normal operation state, operation state and fault state of the power grid are identified; In a further preferred but non-limiting embodiment of the present invention, Figure 3 , step 3 specifically includes: When the power grid operation state in step 3 is a normal operation state, the defect identification method specifically includes: comparing and judging the incoming line current to identify whether the standby automatic current sampling is abnormal; comparing and judging the switch jump state to identify whether the standby automatic switch input is abnormal; The step of comparing and judging the incoming line current specifically includes: Step A1: Based on the input quantity information obtained in step 2, the incoming line currents IL1 and IL2 of the standby automatic switching device and the incoming line protection device are first determined to have successfully obtained current values, and a preliminary judgment is made on the current difference. When the difference between the two incoming line currents does not exceed the set proportion of the rated current, it is determined that there is no abnormality; when the difference between the two incoming line currents exceeds the set proportion of the rated current, further online judgment is performed; Specifically, the size of the set value should be the error caused by the current transformer transmission, the backup automatic switching device transmission and the incoming line protection transmission in the project. In addition, since the current circuit of the backup automatic switching device is rarely changed, only some cases meet the comparison conditions for fault detection, and the threshold setting does not need to be too small. In Example 1, the ratio is set to 10%, and the threshold is set to 10% of the rated current.

[0027] Step A2: Based on the preliminary judgment result of step A1, further online judgment is performed to compare the current of the backup automatic switching device with the incoming line protection current. If the difference exceeds the threshold value I for N0 consecutive times, d , each time at interval t0, it is judged that the standby self-transfer current sampling is abnormal. Among them, N0, I d , t0 is a set value. In this embodiment, N0 can be 3 times, t0 can be 5 minutes, I d 10% of the rated current can be taken. Among them, the incoming line protection current compared with the current of the backup automatic switching device is the incoming line protection current of other devices collected from the same source as the incoming line current of the backup automatic switching device.

[0028] The step of comparing and judging the switch jump status specifically includes: Step B1: Based on the input quantity information obtained in step 2, the switch positions TWJ1 and TWJ2 of the standby automatic transfer device and the incoming line protection device, and the switch position TWJ3 of the standby automatic transfer device and the sectional protection device are obtained at the same time, first determine that the switch positions are successfully obtained, and make a preliminary judgment on the switch position status. If the switch position changes within the set time, it is judged that there is no abnormality; if the switch position does not change within the set time, further judgment is made; Step B2: Based on the preliminary judgment result of step B1, further judgment is made to compare the switch positions of the backup automatic switch, the incoming line protection device and the sectional protection device. If the switch positions are inconsistent for N0 consecutive times, each time at an interval of t0, it is determined that the backup automatic switch input is abnormal. Wherein, N0 and t0 are set values. In this embodiment, N0 can be 3 times and t0 can be 5 minutes.

[0029] When the power grid operation state in step 3 is the power grid operation state, the defect identification method specifically includes: Based on the input quantity information obtained in step 2, the voltage, current and switch status of the standby automatic switch, as well as the charge and discharge status of the standby automatic switch, by judging the correctness of the input quantity, identify whether the current, voltage and switch of the standby automatic switch are consistent; Specifically include: Step C1: Based on the input quantity information obtained in step 2, the voltage, current and switch status of the standby automatic switch, as well as the charge and discharge status of the standby automatic switch, the standby automatic switch is powered on, and if the incoming line switch jumps from 0 to 1, the judgment ends; if the jumper switch changes from 0 to 1, the next judgment is performed; Step C2: Based on the judgment result of step C1, if the incoming line current corresponding to the switch changes from normal load current to no current, the judgment ends; if it does not change to no current, the current of the backup automatic switching device does not correspond to the switch, and it is judged to be an abnormal state; Step C3: Based on the judgment result of step C1, if the bus voltage corresponding to the switch drops to no voltage, the judgment ends; if it does not drop to no voltage and the bus voltage corresponding to other switches does not drop to 0, the judgment ends; if it does not drop to no voltage and the bus voltage corresponding to other switches drops to 0, the voltage of the standby automatic transfer device does not correspond to the switch, and it is judged to be an abnormal state.

[0030] In this embodiment, the operation of the power grid will cause the operation mode to change, thereby changing the voltage, current and switch jump state, and the standby automatic charge and discharge state will also change, which can be used to judge the correctness of the input quantity.

[0031] The incoming line current should correspond to the incoming line switch position. The voltage, current and switch input status of the backup automatic switch should be obtained online regularly. When the switch is opened, the backup automatic switch should be discharged (the charging status changes from charged to uncharged), and the incoming line current changes from normal load current to no current (usually I<2%I N , I N is the rated current).

[0032] The bus voltage may be correlated with the incoming switch position. If the incoming switch changes from closed to open and a certain section of the bus voltage is no voltage (usually U<20%U N , U N is the rated voltage), the incoming switch should correspond to the bus voltage. For example, the incoming switch position 1 should correspond to the bus voltage I being without pressure, and the incoming switch position 2 should correspond to the bus voltage II being without pressure.

[0033] The process of identifying hidden defects in power grid operation status is as follows: Figure 4 As shown, when it is identified that the current and voltage of the backup automatic transfer device are inconsistent with the switch.

[0034] When the power grid operation state in step 3 is a power grid fault state, the defect identification method specifically includes: Step D1: Based on the input quantity information obtained in step 2, the incoming line current, incoming line voltage, and bus voltage of the standby automatic switch, the effective values ​​of the voltage and current before and after the start are obtained through the fault recording; Step D2: Based on the voltage and current effective values ​​before and after the start-up obtained in step D1, determine whether the standby automatic start-up device and its circuit are normal according to the corresponding relationship of the mutation amount. If they all meet equations (1), (2) and (3), they are considered normal. If none of them meet the equations, they are also considered normal. If they partially meet the equations, it is considered that the voltage and current do not match and it is considered an abnormal situation. The judgment formula is: (1) (2) (3) In the formula, IL nt0 To prepare for the effective value of the current in line n before automatic starting, IL nt1 It is the effective value of the incoming line current after the automatic start-up. UL nt0 The effective value of line n voltage before automatic start-up. UL nt1 It is the effective value of the incoming line voltage after the automatic start-up. U nt0 It is the effective value of bus voltage before the automatic start-up. U nt1 It is the effective value of bus voltage after the backup automatic start-up. I N is the rated current, U N is the rated voltage, e i , e ul 、e u is a coefficient, which can usually be taken as 0.1.

[0035] In this embodiment, if Figure 5 As shown, when the upper power supply fails or is disturbed, the backup automatic start-up device may start but fail to operate. The backup automatic start-up device can use the fault recording of the startup record to identify hidden defects.

[0036] When power supply n fails or is disturbed, its incoming current, incoming voltage and bus voltage will suddenly change. The effective values ​​of the voltage and current before and after startup are obtained through fault recording, and whether it is normal is judged based on the corresponding relationship of the sudden change amount.

[0037] (1) (2) (3) In the formula IL nt0 , IL nt1 To prepare for the effective value of the incoming line current before and after the automatic start, UL nt0 , UL nt1 To prepare for the effective value of the incoming line voltage before and after the automatic start-up, U nt0 , U nt1 It is the effective value of bus voltage before and after the automatic start-up. e i , e ul 、e u is a coefficient, which can usually be taken as 0.1.

[0038] When equations (1), (2), and (3) are satisfied at the same time, it is identified as normal. When none of them are satisfied, it is also identified as normal. When some of them are satisfied, it is identified as voltage and current mismatch.

[0039] Step 4: Based on the recognition result obtained in step 3, output whether the standby automatic transfer device is in a normal state or an abnormal state.

[0040] Embodiment 2: In order to execute the method corresponding to the above embodiment 1 to achieve the corresponding functions and technical effects, a defect identification system for a backup automatic start-up device based on online data analysis is provided below. Figure 6 shown.

[0041] A defect identification system for a standby automatic start-up device based on online data analysis, specifically comprising: a standby automatic start-up circuit model building module, an information collection module, a defect identification module, and an output module; A standby automatic switching circuit model building module is used to build a set standby automatic switching circuit model; The information acquisition module is connected to the standby automatic switching circuit model construction module, and the standby automatic switching circuit model constructed based on the standby automatic switching circuit model construction module is used to obtain the input of the standby automatic switching device itself and other protection devices online in real time and regularly through the protection information system; The input quantities in the information collection module specifically include: The voltage, current, switch tripping status, and charging status of the backup automatic transfer device; the current and switch tripping status of the incoming line protection device; the switch tripping status of the section protection device; The invisible defect recognition module is connected to the information acquisition module and is used to identify the defects of the standby automatic switching device and its circuit by comparing and judging based on the input quantity obtained by the information acquisition module in combination with the operation status of the power grid; Among them, the defect identification module specifically includes: a normal operating state defect identification unit, a power grid operation state defect identification unit, and a power grid fault state defect identification unit; The normal operating state defect identification unit is connected to the information acquisition module. Based on the input quantity information acquired by the information acquisition module, the voltage, current, and switch jump status of the standby automatic transfer device, and the current and switch jump status of the incoming line protection device, it is used to identify whether the standby automatic transfer current sampling and switch quantity input are abnormal by judging the correctness of the input quantity; Among them, the normal operating state defect identification unit specifically includes: a current judgment unit and a switch position jump judgment unit; The current judgment subunit is connected to the information acquisition module, and is used to judge the abnormality of the standby automatic transfer current by comparing the current difference based on the input quantity information obtained by the information acquisition module, the current of the standby automatic transfer device, and the incoming line currents IL1 and IL2 obtained by the two incoming line protection devices; In this embodiment, it specifically includes: The current difference between the two incoming lines is compared with the rated current. If it exceeds 10% of the rated current, the next step is to make a judgment. The current of the backup automatic switching device is compared with the incoming line protection current. If the difference exceeds the threshold value I for N0 consecutive times, d , each time at interval t0, it is judged that the current sampling of the backup self-transfer is abnormal. Among them, N0, I d , t0 is a set value. In this embodiment, N0 can be 3 times, t0 can be 5 minutes, I d 10% rated current can be taken.

[0042] The switch position jump judgment subunit is connected to the information acquisition module, and is used to judge the abnormal jump of the standby automatic switch by comparing the switch position based on the input quantity information obtained by the information acquisition module, the switch position of the standby automatic switch device, the incoming switch positions TWJ1 and TWJ2 obtained by the two incoming line protection devices, and the segment switch position TWJ3 obtained by the segment protection device; In this embodiment, it specifically includes: The switch jump status is judged. If there is no change in position within 5 minutes, the next step is judged; the switch jump status of the standby automatic switch device, the incoming line protection device, and the segment protection device is compared. If the switch position is inconsistent for N0 consecutive times, each time at an interval of t0, it is judged that the standby automatic switch input is abnormal. Where N0 and t0 are set values. In this embodiment, N0 can be 3 times and t0 can be 5 minutes.

[0043] Among them, the grid operation state defect identification unit is connected to the information acquisition module, and is used to identify whether the current, voltage and switch of the standby automatic transfer device are consistent with each other by judging the correctness of the input quantity based on the input quantity, the standby automatic transfer voltage, current, switch state and charge and discharge state obtained by the information acquisition module; In this embodiment, it specifically includes: When the standby power is automatically released, if the incoming line switch jumps from 0 to 1, the judgment ends; if the jumper switch changes from 0 to 1, the next judgment is carried out; If the incoming line current corresponding to the switch changes from normal load current to no current, the judgment ends; if it does not change to no current, the current of the backup automatic switching device does not correspond to the switch, and it is judged as an abnormal state; If the bus voltage corresponding to the switch drops to no voltage, the judgment ends; if it does not drop to no voltage and the bus voltage corresponding to other switches does not drop to 0, the judgment ends; if it does not drop to no voltage and the bus voltage corresponding to other switches drops to 0, the voltage of the backup automatic transfer device does not correspond to the switch, and it is judged to be an abnormal state; Among them, the power grid fault state defect identification unit is connected to the information acquisition module, and based on the input quantity obtained by the information acquisition module, it compares and judges the incoming line current, incoming line voltage, and bus voltage during the power grid fault state to identify whether the voltage and current of the backup automatic transfer device match; In this embodiment, it specifically includes: The effective values ​​of the voltage and current before and after the start-up are obtained by fault recording, and the corresponding relationship of the sudden change quantity is used to determine whether the backup automatic switching device and its circuit are normal. If they meet equations (1), (2), and (3) at the same time, they are identified as normal. If they do not meet all the equations, they are also identified as normal. If they partially meet the equations, it is identified as a mismatch between the voltage and current, and it is determined to be an abnormal situation. The judgment formula is: (1) (2) (3) In the formula, IL nt0 To prepare for the effective value of the current in line n before automatic starting, IL nt1 It is the effective value of the incoming line current after the automatic start-up. UL nt0 The effective value of line n voltage before automatic start-up. UL nt1 It is the effective value of the incoming line voltage after the automatic start-up. U nt0 It is the effective value of bus voltage before the automatic start-up. U nt1 It is the effective value of bus voltage after the backup automatic start-up. I N is the rated current, U N is the rated voltage, ei , e ul 、e u is a coefficient, which can usually be taken as 0.1.

[0044] The output module is connected to the defect recognition module and is used to determine whether the output standby automatic switching circuit is in a normal state or an abnormal state based on the recognition result obtained by the defect recognition module.

[0045] Compared with the prior art, the invention has the following advantages: ① The hidden defects of the backup automatic switching device and its circuit can be identified by combining the real-time acquired voltage, current and switch quantity collection information and its own logical judgment information with other information source data.

[0046] ② Make full use of different states such as changes in grid operation mode, system failures, power switching, etc., and use the real-time acquired voltage and current and switch quantity collection information and its own logical judgment information to maximize the identification of hidden risks of the standby automatic transfer device and its circuit.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for identifying defects of a standby automatic start-up device based on online data analysis, characterized in that: The following steps are involved: Step 1: Construct a set backup automatic switching circuit model, including backup automatic switching device, incoming line protection device, and section protection device; Step 2: Based on the backup automatic transfer model constructed in step 1, the voltage, current, switch tripping status, and charging status of the backup automatic transfer device are obtained regularly and in real time online through the protection information system; the current and switch tripping status of the incoming line protection device; and the switch tripping status of the section protection device; Step 3: Based on the input quantity information obtained in step 2, by judging the correctness of the input quantity, the defects of the backup automatic switching device and its circuit in the normal operation state, operation state and fault state of the power grid are identified; Step 4: Based on the recognition result obtained in step 3, output whether the standby automatic transfer device is in a normal state or an abnormal state.

2. The method for identifying defects of a backup automatic start-up device based on online data analysis according to claim 1 is characterized in that: In step 3, when the power grid is in a normal operating state, the defect identification method of the automatic backup device and its circuit specifically includes: By comparing and judging the incoming current, it is possible to identify whether the standby automatic transfer current sampling is abnormal; by comparing and judging the switch jump status, it is possible to identify whether the standby automatic transfer switch input is abnormal.

3. The method for identifying defects of a backup automatic start-up device based on online data analysis according to claim 2 is characterized in that: The method for comparing and judging the incoming line current specifically includes: Step A1: Based on the input quantity information obtained in step 2, the incoming current of the standby automatic switching device and the incoming line protection device, first determine that the current values ​​are successfully obtained, and make a preliminary judgment on the current difference. When the difference between the two incoming line currents does not exceed the set proportion of the rated current, it is judged that there is no abnormality; when the difference between the two incoming line currents exceeds the set proportion of the rated current, further online judgment is performed; Step A2: Based on the preliminary judgment result of step A1, further online judgment is performed to compare the current of the backup automatic switching device with the incoming line protection current. If the difference exceeds the threshold value I for N0 consecutive times, d , each time at interval t0, it is judged that the standby self-transfer current sampling is abnormal; among them, N0, I d , t0 is the set value.

4. The method for identifying defects of a backup automatic start-up device based on online data analysis according to claim 2 is characterized in that: The method for comparing and judging the switch jump state specifically includes: Step B1: Based on the input quantity information obtained in step 2, the switch positions of the standby automatic transfer device and the incoming line protection device, and the switch positions of the standby automatic transfer device and the sectional protection device are obtained at the same time, first determine that the switch positions are successfully obtained, and make a preliminary judgment on the switch position status. If the switch position changes within the set time, it is judged that there is no abnormality; if the switch position does not change within the set time, further judgment is made; Step B2: Based on the preliminary judgment result of step B1, further judgment is made to compare the switch positions of the standby automatic switching device, the incoming line protection device and the section protection device. If the switch positions are inconsistent for N0 consecutive times, each with an interval of t0, it is judged that the input of the standby automatic switching device is abnormal; wherein N0 and t0 are set values.

5. The method for identifying defects of a backup automatic start-up device based on online data analysis according to claim 1 is characterized in that: In step 3, when the power grid is in operation, the defect identification method of the automatic backup device and its circuit specifically includes: Step C1: Based on the input quantity information obtained in step 2, the voltage, current and switch status of the standby automatic switch, as well as the charge and discharge status of the standby automatic switch, if the incoming line switch jumps from 0 to 1, the judgment ends; if the jumper switch changes from 0 to 1, the next judgment is performed; Step C2: Based on the judgment result of step C1, if the incoming line current corresponding to the switch changes from normal load current to no current, the judgment ends; if it does not change to no current, the current of the backup automatic switching device does not correspond to the switch, and it is judged to be an abnormal state; Step C3: Based on the judgment result of step C1, if the bus voltage corresponding to the switch drops to no voltage, the judgment ends; if it does not drop to no voltage and the bus voltage corresponding to other switches does not drop to 0, the judgment ends; if it does not drop to no voltage and the bus voltage corresponding to other switches drops to 0, the voltage of the standby automatic transfer device does not correspond to the switch, and it is judged to be an abnormal state.

6. The method for identifying defects of a backup automatic start-up device based on online data analysis according to claim 1 is characterized in that: In step 3, when the power grid is in a fault state, the defect identification method of the backup automatic switching device and its circuit specifically includes: Step D1: Based on the input quantity information obtained in step 2, the incoming line current, incoming line voltage, and bus voltage of the standby automatic switch, the effective values ​​of the voltage and current before and after the start are obtained through the fault recording; Step D2: Based on the voltage and current effective values ​​before and after the start-up obtained in step D1, determine whether the standby automatic start-up device and its circuit are normal according to the corresponding relationship of the mutation amount. If they all meet equations (1), (2) and (3), they are considered normal. If none of them meet the equations, they are also considered normal. If they partially meet the equations, it is considered that the voltage and current do not match and it is considered an abnormal situation. The judgment formula is: （1） （2） （3） In the formula, IL nt0 To prepare for the effective value of the current in line n before automatic starting, IL nt1 It is the effective value of the incoming line current after the automatic start-up. UL nt0 The effective value of line n voltage before automatic start-up. UL nt1 It is the effective value of the incoming line voltage after the automatic start-up. U nt0 It is the effective value of bus voltage before the automatic start-up. U nt1 It is the effective value of bus voltage after the backup automatic start-up. I N is the rated current, U N is the rated voltage, ε i , ε ul , ε u is the coefficient.

7. A system for identifying defects of a standby automatic start-up device based on online data analysis, running a method for identifying defects of a standby automatic start-up device based on online data analysis as claimed in any one of claims 1 to 6, comprising: The standby automatic return loop model building module, information collection module, defect identification module and output module are characterized by: A standby automatic switching circuit model building module is used to build a set standby automatic switching circuit model; The information acquisition module is connected to the standby automatic switching circuit model construction module, and the standby automatic switching circuit model constructed based on the standby automatic switching circuit model construction module is used to obtain the input of the standby automatic switching device itself and other protection devices online in real time and regularly through the protection information system; The defect recognition module is connected to the information acquisition module and is used to identify the defects of the backup automatic switching device and its circuit by comparing and judging based on the input quantity obtained by the information acquisition module in combination with the operation status of the power grid; The output module is connected to the defect recognition module and is used to determine whether the output standby automatic switching circuit is in a normal state or an abnormal state based on the recognition result obtained by the hidden defect recognition module.

8. The defect identification system for automatic standby device based on online data analysis according to claim 7 is characterized in that: The defect recognition module includes: a normal operation state defect recognition unit, a power grid operation state defect recognition unit, and a power grid fault state defect recognition unit; The normal operating state defect identification unit is connected to the information acquisition module. Based on the input quantity information acquired by the information acquisition module, the voltage, current, and switch jump status of the standby automatic transfer device, and the current and switch jump status of the incoming line protection device, it is used to identify whether the standby automatic transfer current sampling and switch quantity input are abnormal by judging the correctness of the input quantity; The grid operation state defect identification unit is connected to the information acquisition module, and is used to identify whether the current, voltage and switch of the standby automatic transfer device are consistent with each other by judging the correctness of the input quantity based on the input quantity, the standby automatic transfer voltage, current, switch state and charge and discharge state obtained by the information acquisition module; The power grid fault state defect identification unit is connected to the information acquisition module. Based on the input quantity obtained by the information acquisition module, it compares and judges the incoming line current, incoming line voltage and bus voltage during the power grid fault state to identify whether the voltage and current of the backup automatic transfer device match.

9. The defect identification system for standby automatic start-up device based on online data analysis according to claim 8 is characterized in that: The normal operation defect identification unit includes: a current judgment unit and a switch position jump judgment unit; The current judgment subunit is connected to the information acquisition module, and is used to judge the abnormality of the standby automatic transfer current by comparing the current difference based on the input quantity information obtained by the information acquisition module, the current of the standby automatic transfer device, and the incoming line current obtained by the two incoming line protection devices; The switch position jump judgment unit is connected to the information acquisition module. Based on the input information obtained by the information acquisition module, the switch position of the standby automatic transfer device, the incoming line switch position obtained by the two incoming line protection devices, and the segment switch position obtained by the segment protection device, it is used to judge the abnormal jumping situation of the standby automatic transfer switch by comparing the switch position.

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