110kV single bus tripping and standby automatic switching judgment method based on monitoring information event system

Abstract

This invention discloses a method for judging 110kV single busbar tripping and automatic transfer switching based on a monitoring information event system. First, the initial states of each outgoing switch on the busbar and the switches in the downstream substation are collected to form a switch initial state matrix. The automatic transfer switching action is initiated by the busbar protection output signal for comprehensive judgment. Corresponding protection action signals, total fault signals, and switch opening and closing signals are collected, sequentially forming a protection action matrix, a total fault matrix, a switch opening matrix, and a switch closing matrix. A condition matrix is ​​calculated based on the auxiliary judgment matrix. The characteristic values ​​obtained from the condition matrix are used to judge the busbar tripping status of the upstream substation and the automatic transfer switching action status of the downstream substation. This method can achieve automatic computer judgment of the busbar protection action status and the automatic transfer switching action status of the downstream substation after a 110kV single busbar fault. It can improve the reporting efficiency of monitoring personnel for comprehensive busbar tripping accidents and buy more time for accident handling.

Description

Technical Field

[0001] The invention relates to a 110kV single bus tripping and standby automatic switching judgment method based on a monitoring information event system, and belongs to the technical field of power grid control operation and substation signal monitoring. Background Art

[0002] With the continuous development of the economy and society, the demand for electricity and the reliability of power supply are increasing day by day, and the number of substations and substation alarm signals are also growing rapidly. The massive amount of substation alarm information, coupled with the high timeliness requirements for power grid fault reporting, has put increasing pressure on power grid monitoring services. Especially when a comprehensive tripping event such as busbar tripping occurs, the monitor needs to perform a lot of analysis and judgment in a short period of time. How to avoid misjudgment and missed judgment in this case is one of the urgent problems to be solved in the current monitoring business. The monitoring information event information system is an analysis and judgment tool that has been put into use. It associates related signals according to certain rules and generates an event, but it can only synthesize a single tripping event. When the busbar trips, multiple outgoing lines trip and the lower-level substation backup automatic operation cannot form a comprehensive tripping event. The monitor needs to further analyze and judge multiple single tripping events by himself, which affects the efficiency of accident reporting, and there is a risk of misjudgment and missed judgment, which is not conducive to accelerating accident handling and quickly restoring power supply. Summary of the invention

[0003] The purpose of the present invention is to provide a 110kV single bus tripping and standby automatic re-closing identification method based on a monitoring information event system, to identify the 110kV single bus tripping, judge the standby automatic re-closing action of the lower-level substation, and synthesize the comprehensive bus tripping events, so as to improve the functions of the monitoring information event system.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A 110kV single bus tripping and standby automatic switching judgment method based on a monitoring information event system, comprising:

[0006] (1) Determine the switch operation state according to the switch operation parameters and construct the switch initial state matrix;

[0007] (2) Construct the switch bay accident matrix, relay protection output matrix, switch tripping matrix, and switch closing matrix based on the real-time power grid signals;

[0008] (3) The conditional matrix is ​​calculated based on the auxiliary judgment matrix, and the eigenvalues ​​are obtained based on the conditional matrix to judge the bus tripping of the upper-level substation and the action of the backup automatic switching of the lower-level substation.

[0009] Furthermore, step (1) constructing the switch initial state matrix includes the following steps:

[0010] The monitoring master station makes a comprehensive judgment on the operating status of the switch through conditions 1 to 3:

[0011]

[0012]

[0013]

[0014] Among them, I a , I b , I c is the three-phase current of the switch; DL a , DL b , DL c is the switch position, when the switch is closed, its value is 1, otherwise it is 0; CDZP is the transmission card setting status of the switch interval, when the transmission card is set in the interval, its value is 1, otherwise it is 0; CTDX is the current transformer disconnection signal action status of the switch interval, when the current transformer disconnection signal is actuated, its value is 1, otherwise it is 0;

[0015] The variable y represents the operating state of the switch. When the switch satisfies conditions 1 to 3 at the same time, the monitoring master station considers that the switch is in the operating state, which is recorded as y = 1. The initial state vector CX is formed by the initial state of the outgoing switch i and the corresponding switch of the downstream substation i , expressed as:

[0016]

[0017] Among them, y i ,y i1 ,y i2 ,y i3 Both are 0 / 1 variables, representing the outgoing line switch k i , Outlet switch k i The corresponding lower-level substation incoming switch k i1 , Another incoming switch k of the lower substation i2 , lower substation bridge switch or section switch k i3 The running status of

[0018] The initial state vectors corresponding to all outgoing switches on the busbar constitute the switch initial state matrix, which is expressed as:

[0019]

[0020] Where k is the number of outgoing lines on the bus;

[0021] The step (2) comprises the following steps:

[0022] 2.1) Construct relay protection export matrix

[0023] When a busbar fault occurs, the busbar related protection outlet trips the outgoing switch. After the outgoing switch trips, the downstream substation automatic protection device outlet trips the corresponding incoming switch and closes the bridge switch or section switch. The busbar protection outlet signal and the downstream substation automatic outlet signal corresponding to the outgoing switch i form the relay protection outlet vector of the outgoing switch i, which can be expressed as:

[0024]

[0025] Among them, j, j i1 、j i2 、j i3 All are 0 / 1 variables; j is the busbar protection outlet signal. When any busbar protection outlet is activated, j=1; j i1 、j i2 、j i3 The incoming switch k for the lower substation i1 , another incoming line switch k i2 , bridge switch or segment switch k i3 The output signal of the automatic switching device of the backup power supply is output. When the automatic switching device of the backup power supply of the lower-level substation is output, j i1 、j i2 、j i3 All are 1;

[0026] The relay protection output vectors of all outgoing switches on the busbar constitute the relay protection output matrix, namely:

[0027]

[0028] Wherein, k is the number of outgoing lines on the bus;

[0029] 2.2) Construct the total matrix of switch bay accidents:

[0030] The total switch bay accident signal is one of the characteristic signals of the bay accident tripping. The action state of the total switch bay accident signal is represented by a 0 / 1 variable, that is, 1 indicates that the total switch bay accident signal is acting, and 0 indicates that the total switch bay accident signal is not acting. Then the total switch bay accident vector SGZ of the outgoing switch i is i It can be expressed as:

[0031]

[0032] Among them, s i 、s i1 、s i2 、s i3 Both are 0 / 1 variables, representing the outgoing line switch k i , the corresponding outgoing line switch k of the lower substation iIncoming switch k i1 , Another incoming switch k of the lower substation i2 , lower substation bridge switch or section switch k i3 Total operating status of switch bay accidents;

[0033] The total vector of all outgoing switch bay accidents on the busbar can form the total switch bay accident matrix, that is:

[0034]

[0035] Wherein, k is the number of outgoing lines on the bus;

[0036] 2.3) Constructing the switch tripping matrix

[0037] The variable tz represents the trip signal sent by the switch to the monitoring master station. When the switch i sends a trip signal, tz i =1, otherwise tz i =0, then the opening vector of the outgoing switch i and the corresponding switch of the downstream substation is expressed as:

[0038]

[0039] The tripping vectors of all outgoing switches on the busbar constitute the switch tripping matrix, namely:

[0040]

[0041] 2.4) Constructing the switch closing matrix

[0042] The variable hz indicates whether the switch is open. When switch i is closed, hz i =1, otherwise 0, then the closing vector of the outgoing switch i and its corresponding switch in the downstream substation is expressed as:

[0043]

[0044] The closing vectors of all outgoing switches on the bus constitute the switch closing matrix, that is,

[0045]

[0046] The step (3) comprises the following steps:

[0047] 3.1) Forming the Criteria Matrix

[0048] The matrix obtained based on the above steps forms the criterion matrix G, and the calculation formula is:

[0049] G=YS*J*TZ+HZ-Z

[0050] Among them, * is the matrix bitwise multiplication operation; all parameters in the switch interval accident total matrix S, relay protection output matrix J, switch tripping matrix TZ, and switch closing matrix HZ are signals received within 20 seconds after the monitoring master station receives the busbar protection action signal; Z is the state matrix, and its value is:

[0051]

[0052] 3.2) Forming a conditional matrix

[0053] The calculation formula of condition matrix 1 is:

[0054]

[0055] Where abs() is the operation of taking the absolute value of all elements in the matrix; f 1k 、f 2k is the switch tripping characteristic value; Q1 is the switching matrix 1, and its value is:

[0056]

[0057] The calculation formula of condition matrix 2 is:

[0058] N=Q2·S=[n1 n2…n k ]

[0059] Among them, n k is the characteristic value of the standby automatic switching action; Q2 is the switching matrix 2, and its value is:

[0060] Q2=[01 1 1]

[0061] The calculation formula of condition matrix 3 is:

[0062] M=Q2·J=[m1 m2…m k ]

[0063] Among them, m k To prepare the characteristic value of the automatic export;

[0064] 3.2) Determine the busbar protection and backup automatic switching operation status:

[0065] When the busbar trips, the outgoing line switch will have two situations: "tripped" and "not tripped", and the corresponding lower-level substation backup automatic switch will have three situations: "successful backup automatic switch action", "failed backup automatic switch action" and "no backup automatic switch outlet". According to the switch tripping characteristic value f 1i 、f 2i The tripping condition of switch i is judged. When f is satisfied 1i =f 2i = 0, the monitoring master station forms a judgment: "switch i trips", when f 1i>0 and f 2i >0, the monitoring master station forms a judgment: "switch i has not tripped"; the backup automatic action characteristic value n i The response switch i corresponds to the lower level substation backup automatic switching action. i >0, the monitoring master station forms a judgment: "The backup automatic switching action of the lower-level substation is successful", when n i = 0, the monitoring master station forms a judgment: "The backup automatic switching action of the lower-level substation fails"; the backup automatic switching output characteristic value m i The response switch i corresponds to the lower-level substation backup automatic output situation, when m i =3, the monitoring master station forms a judgment: "The lower-level substation has a self-closing outlet", when m i =0, the monitoring master station forms a judgment: "The lower-level substation backup automatic switch has not been exported." The specific judgment is as follows:

[0066] When the eigenvalue satisfies f 1i =f 2i =0, n i >0,m i =3, the event system synthesizes the event "switch i trips, the lower-level substation backup automatic switching action is successful"; when the characteristic value satisfies f 1i =f 2i =n i =0, m i =3, the event system synthesizes the event "switch i trips, the lower-level substation backup automatic switching action fails"; when the characteristic value satisfies f 1i =f 2i =n i =m i = 0, the event system synthesizes the event "switch i trips, and the lower-level substation backup automatic switch does not exit"; when the characteristic value satisfies f 1i >0,f 2i >0,n i >0,m i =3, the event system synthesizes the event "switch i did not trip, the lower-level substation backup automatic switching action was successful"; when the characteristic value satisfies f 1i >0,f 2i >0,n i =0, m i =3, the event system synthesizes the event "switch i does not trip, the lower-level substation backup automatic switching action fails"; when the characteristic value satisfies f 1i >0,f 2i >0,n i =m i =0, the event system synthesizes the event "switch i has not tripped, and the lower-level substation backup automatic switching action has not been exported";

[0067] When the characteristic values ​​of all outgoing switches on the 110kV bus meet the requirements of f1i =f 2i =0, n i >0,m i =3, the event system synthesizes the event "110kV busbar protection action is successful, all operating switches trip, lower-level substation backup automatic transfer is successful, and there is no load loss".

[0068] Compared with the prior art, the beneficial effects of the present invention are: 1. The method can automatically judge the busbar protection and the standby automatic switching action of the lower-level substation according to the monitoring alarm information and form a comprehensive event to assist the monitor in reporting the accident; 2. The method can avoid the risk of misjudgment and missed judgment by the monitor, and at the same time can quickly screen the substations where the standby automatic switching action fails and the standby automatic switching does not exit and cause load loss, which is conducive to accelerating accident handling and accelerating the restoration of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 This is a schematic diagram of the typical wiring method of a 110kV single-busbar substation;

[0070] Figure 2 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0071] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0072] like Figure 1 As shown, it is a schematic diagram of a typical wiring method of a 110kV single busbar substation applied in the present invention.

[0073] like Figure 2 The present invention provides a 110kV single bus tripping and standby automatic switching judgment method based on a monitoring information event system, including:

[0074] 1. Determine the switch operation status according to the switch operation parameters and construct the switch initial state matrix;

[0075] Step 1: Constructing the switch initial state matrix includes the following steps:

[0076] The monitoring master station makes a comprehensive judgment on the operating status of the switch through conditions 1 to 3:

[0077]

[0078]

[0079]

[0080] Among them, I a , I b , I c is the three-phase current of the switch; DLa , DL b , DL c is the switch position, when the switch is closed, its value is 1, otherwise it is 0; CDZP is the transmission card setting status of the switch interval, when the transmission card is set in the interval, its value is 1, otherwise it is 0; CTDX is the current transformer disconnection signal action status of the switch interval, when the current transformer disconnection signal is actuated, its value is 1, otherwise it is 0;

[0081] The variable y represents the operating state of the switch. When the switch satisfies conditions 1 to 3 at the same time, the monitoring master station considers that the switch is in the operating state, which is recorded as y = 1. The initial state vector CX is formed by the initial state of the outgoing switch i and the corresponding switch of the downstream substation i , expressed as:

[0082]

[0083] Among them, y i ,y i1 ,y i2 ,y i3 Both are 0 / 1 variables, representing the outgoing line switch k i , Outlet switch k i The corresponding lower-level substation incoming switch k i1 , Another incoming switch k of the lower substation i2 , lower substation bridge switch or section switch k i3 The running status of

[0084] The initial state vectors corresponding to all outgoing switches on the busbar constitute the switch initial state matrix, which is expressed as:

[0085]

[0086] Where k is the number of outgoing lines on the bus;

[0087] 2. Constructing the switch bay accident matrix, relay protection output matrix, switch tripping matrix, and switch closing matrix according to the real-time power grid signal; including the following steps:

[0088] 2.1) Construct relay protection export matrix

[0089] When a busbar fault occurs, the busbar related protection outlet trips the outgoing switch. After the outgoing switch trips, the downstream substation automatic protection device outlet trips the corresponding incoming switch and closes the bridge switch or section switch. The busbar protection outlet signal and the downstream substation automatic outlet signal corresponding to the outgoing switch i form the relay protection outlet vector of the outgoing switch i, which can be expressed as:

[0090]

[0091] Among them, j, j i1 、j i2 、j i3 All are 0 / 1 variables; j is the busbar protection outlet signal. When any busbar protection outlet is activated, j=1; j i1 、j i2 、j i3 The incoming switch k for the lower substation i1 , another incoming line switch k i2 , bridge switch or segment switch k i3 The output signal of the automatic switching device of the backup power supply is output. When the automatic switching device of the backup power supply of the lower-level substation is output, j i1 、j i2 、j i3 All are 1;

[0092] The relay protection output vectors of all outgoing switches on the busbar constitute the relay protection output matrix, namely:

[0093]

[0094] Wherein, k is the number of outgoing lines on the bus;

[0095] 2.2) Construct the total matrix of switch bay accidents:

[0096] The total switch bay accident signal is one of the characteristic signals of the bay accident tripping. The action state of the total switch bay accident signal is represented by a 0 / 1 variable, that is, 1 indicates that the total switch bay accident signal is acting, and 0 indicates that the total switch bay accident signal is not acting. Then the total switch bay accident vector SGZ of the outgoing switch i is i It can be expressed as:

[0097]

[0098] Among them, s i 、s i1 、s i2 、s i3 Both are 0 / 1 variables, representing the outgoing line switch k i , the corresponding outgoing line switch k of the lower substation i Incoming switch k i1 , Another incoming switch k of the lower substation i2 , lower substation bridge switch or section switch k i3 Total operating status of switch bay accidents;

[0099] The total vector of all outgoing switch bay accidents on the busbar can form the total switch bay accident matrix, that is:

[0100]

[0101] Wherein, k is the number of outgoing lines on the bus;

[0102] 2.3) Constructing the switch tripping matrix

[0103] The variable tz represents the trip signal sent by the switch to the monitoring master station. When the switch i sends a trip signal, tz i =1, otherwise tz i =0, then the opening vector of the outgoing switch i and the corresponding switch of the downstream substation is expressed as:

[0104]

[0105] The tripping vectors of all outgoing switches on the busbar constitute the switch tripping matrix, namely:

[0106]

[0107] 2.4) Constructing the switch closing matrix

[0108] The variable hz indicates whether the switch is open. When switch i is closed, hz i =1, otherwise 0, then the closing vector of the outgoing switch i and its corresponding switch in the downstream substation is expressed as:

[0109]

[0110] The closing vectors of all outgoing switches on the bus constitute the switch closing matrix, that is,

[0111]

[0112] 3. The conditional matrix is ​​calculated based on the auxiliary judgment matrix, and the characteristic value is obtained based on the conditional matrix to judge the bus tripping of the upper substation and the standby automatic switching action of the lower substation, including the following steps:

[0113] 3.1) Forming the Criteria Matrix

[0114] The matrix obtained based on the above steps forms the criterion matrix G, and the calculation formula is:

[0115] G=YS*J*TZ+HZ-Z

[0116] Among them, * is the matrix bitwise multiplication operation; all parameters in the switch interval accident total matrix S, relay protection output matrix J, switch tripping matrix TZ, and switch closing matrix HZ are signals received within 20 seconds after the monitoring master station receives the busbar protection action signal; Z is the state matrix, and its value is:

[0117]

[0118] 3.2) Forming a conditional matrix

[0119] The calculation formula of condition matrix 1 is:

[0120]

[0121] Where abs() is the operation of taking the absolute value of all elements in the matrix; f 1k 、f 2k is the switch tripping characteristic value; Q1 is the switching matrix 1, and its value is:

[0122]

[0123] The calculation formula of condition matrix 2 is:

[0124] N=Q2·S=[n1 n2…n k ]

[0125] Among them, n k is the characteristic value of the standby automatic switching action; Q2 is the switching matrix 2, and its value is:

[0126] Q2=[01 1 1]

[0127] The calculation formula of condition matrix 3 is:

[0128] M=Q2·J=[m1 m2…m k ]

[0129] Among them, m k To prepare the characteristic value of the automatic export;

[0130] 3.2) Determine the busbar protection and backup automatic switching operation status:

[0131] When the busbar trips, the outgoing switch will have two situations: "tripped" and "not tripped". The corresponding lower-level substation backup switch will have three situations: "successful backup switch action", "failed backup switch action" and "no backup switch exit". The backup switch is divided into two stages, first the backup switch exit, then the backup switch action. The backup switch exit is a prerequisite for the backup switch action, so there are three situations. According to the switch trip characteristic value f 1i 、f 2i The tripping condition of switch i is judged. When f is satisfied 1i =f 2i = 0, the monitoring master station forms a judgment: "switch i trips", when f 1i >0 and f 2i >0, the monitoring master station forms a judgment: "switch i has not tripped"; the backup automatic action characteristic value n i The response switch i corresponds to the lower level substation backup automatic switching action. i >0, the monitoring master station forms a judgment: "The backup automatic switching action of the lower-level substation is successful", when ni = 0, the monitoring master station forms a judgment: "The backup automatic switching action of the lower-level substation fails"; the backup automatic switching output characteristic value m i The response switch i corresponds to the lower-level substation backup automatic output situation, when m i =3, the monitoring master station forms a judgment: "The lower-level substation has a self-closing outlet", when m i =0, the monitoring master station forms a judgment: "The lower-level substation backup automatic switch has not been exported." The specific judgment is as follows:

[0132] When the eigenvalue satisfies f 1i =f 2i =0, n i >0,m i =3, the event system synthesizes the event "switch i trips, the lower-level substation backup automatic switching action is successful"; when the characteristic value satisfies f 1i =f 2i =n i =0, m i =3, the event system synthesizes the event "switch i trips, the lower-level substation backup automatic switching action fails"; when the characteristic value satisfies f 1i =f 2i =n i =m i = 0, the event system synthesizes the event "switch i trips, and the lower-level substation backup automatic switch does not exit"; when the characteristic value satisfies f 1i >0,f 2i >0,n i >0,m i =3, the event system synthesizes the event "switch i did not trip, the lower-level substation backup automatic switching action was successful"; when the characteristic value satisfies f 1i >0,f 2i >0,n i =0, m i =3, the event system synthesizes the event "switch i does not trip, the lower-level substation backup automatic switching action fails"; when the characteristic value satisfies f 1i >0,f 2i >0,n i =m i =0, the event system synthesizes the event "switch i has not tripped, and the lower-level substation backup automatic switching action has not been exported";

[0133] When the characteristic values ​​of all outgoing switches on the 110kV bus meet the requirements of f 1i =f 2i =0, n i >0,m i =3, the event system synthesizes the event "110kV busbar protection action is successful, all operating switches trip, lower-level substation backup automatic transfer is successful, and there is no load loss".

[0134] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A 110kV single bus tripping and standby automatic switching judgment method based on a monitoring information event system, characterized in that: (1) Determine the switch operation state according to the switch operation parameters and construct the switch initial state matrix; Constructing the switch initial state matrix includes the following steps: The monitoring master station makes a comprehensive judgment on the operating status of the switch through conditions 1 to 3: Among them, I a , I b , I c is the three-phase current of the switch; DL a , DL b , DL c is the switch position, when the switch is closed, its value is 1, otherwise it is 0; CDZP is the transmission card setting status of the switch interval, when the transmission card is set in the interval, its value is 1, otherwise it is 0; CTDX is the current transformer disconnection signal action status of the switch interval, when the current transformer disconnection signal is actuated, its value is 1, otherwise it is 0; The variable y represents the operating state of the switch. When the switch satisfies conditions 1 to 3 at the same time, the monitoring master station considers that the switch is in the operating state, which is recorded as y = 1. The initial state vector CX is formed by the initial state of the outgoing switch i and the corresponding switch of the downstream substation i , expressed as: Among them, y i ,y i1 ,y i2 ,y i3 Both are 0 / 1 variables, representing the outgoing line switch k i , Outlet switch k i The corresponding lower-level substation incoming switch k i1 , Another incoming switch k of the lower substation i2 , lower substation bridge switch or section switch k i3 The operating status of The initial state vectors corresponding to all outgoing switches on the busbar constitute the switch initial state matrix, which is expressed as: Where k is the number of outgoing lines on the bus; (2) constructing a switch bay accident matrix, a relay protection output matrix, a switch tripping matrix, and a switch closing matrix according to real-time power grid signals; specifically, the following steps are included: 2.1) Construct relay protection export matrix When a busbar fault occurs, the busbar related protection outlet trips the outgoing switch. After the outgoing switch trips, the downstream substation automatic protection device outlet trips the corresponding incoming switch and closes the bridge switch or section switch. The busbar protection outlet signal and the downstream substation automatic outlet signal corresponding to the outgoing switch i form the relay protection outlet vector of the outgoing switch i, which can be expressed as: Among them, j, j i1 、j i2 、j i3 All are 0 / 1 variables; j is the busbar protection outlet signal. When any busbar protection outlet is activated, j=1; j i1 、j i2 、j i3 The incoming switch k for the lower substation i1 , another incoming switch k i2 , bridge switch or segment switch k i3 The output signal of the automatic switching device of the backup power supply is output. When the automatic switching device of the backup power supply of the lower-level substation is output, j i1 、j i2 、j i3 All are 1; The relay protection output vectors of all outgoing switches on the busbar constitute the relay protection output matrix, namely: Wherein, k is the number of outgoing lines on the bus; 2.2) Construct the total matrix of switch bay accidents: The total switch bay accident signal is one of the characteristic signals of the bay accident tripping. The action state of the total switch bay accident signal is represented by a 0 / 1 variable, that is, 1 indicates that the total switch bay accident signal is acting, and 0 indicates that the total switch bay accident signal is not acting. Then the total switch bay accident vector SGZ of the outgoing switch i is i It can be expressed as: Among them, s i 、s i1 、s i2 、s i3 Both are 0 / 1 variables, representing the outgoing line switch k i , the corresponding outgoing line switch k of the lower substation i Incoming switch k i1 , Another incoming switch k of the lower substation i2 , lower substation bridge switch or section switch k i3 Total operating status of switch bay accidents; The total vector of all outgoing switch bay accidents on the busbar can form the total switch bay accident matrix, that is: Wherein, k is the number of outgoing lines on the bus; 2.3) Constructing the switch tripping matrix The variable tz represents the trip signal sent by the switch to the monitoring master station. When the switch i sends a trip signal, tz i =1, otherwise tz i =0, then the opening vector of the outgoing switch i and the corresponding switch of the downstream substation is expressed as: The tripping vectors of all outgoing switches on the busbar constitute the switch tripping matrix, namely: 2.4) Constructing the switch closing matrix The variable hz indicates whether the switch is open. When switch i is closed, hz i =1, otherwise 0, then the closing vector of the outgoing switch i and its corresponding switch in the downstream substation is expressed as: The closing vectors of all outgoing switches on the bus constitute the switch closing matrix, that is, (3) The conditional matrix is ​​calculated based on the auxiliary judgment matrix, and the characteristic value is obtained based on the conditional matrix to judge the bus tripping of the upper substation and the action of the backup automatic switching of the lower substation; specifically, the following steps are included: 3.1) Forming the Criteria Matrix The matrix obtained based on the above steps forms the criterion matrix G, and the calculation formula is: G=YS*J*TZ+HZ-Z Among them, * is the matrix bitwise multiplication operation; all parameters in the switch interval accident total matrix S, relay protection output matrix J, switch tripping matrix TZ, and switch closing matrix HZ are signals received within 20 seconds after the monitoring master station receives the busbar protection action signal; Z is the state matrix, and its value is: 3.2) Forming a conditional matrix The calculation formula of condition matrix 1 is: Where abs() is the operation of taking the absolute value of all elements in the matrix; f 1k 、f 2k is the switch tripping characteristic value; Q1 is the switching matrix 1, and its value is: The calculation formula of condition matrix 2 is: N=Q2·S=[n1 n2…n k ] Among them, n k is the characteristic value of the standby automatic switching action; Q2 is the switching matrix 2, and its value is: Q2＝[0 1 1 1] The calculation formula of condition matrix 3 is: M=Q2·J=[m1 m2…m k ] Among them, m k To prepare the characteristic value of the automatic export; 3.2) Determine the busbar protection and backup automatic switching operation status: When the eigenvalue satisfies f 1i =f 2i =0, n i >0,m i =3, the event system synthesizes the event "switch i trips, the lower-level substation backup automatic switching action is successful"; when the characteristic value satisfies f 1i =f 2i =n i =0, m i =3, the event system synthesizes the event "switch i trips, the lower-level substation backup automatic switching action fails"; when the characteristic value satisfies f 1i =f 2i =n i =m i = 0, the event system synthesizes the event "switch i trips, and the lower-level substation backup automatic switch does not exit"; when the characteristic value satisfies f 1i >0,f 2i >0,n i >0,m i =3, the event system synthesizes the event "switch i does not trip, the lower-level substation backup automatic switching action is successful"; when the characteristic value satisfies f 1i >0,f 2i >0,n i =0, m i =3, the event system synthesizes the event "switch i does not trip, the lower-level substation backup automatic switching action fails"; when the characteristic value satisfies f 1i >0,f 2i >0,n i =m i = 0, the event system synthesizes the event "switch i is not tripped, and the lower-level substation backup automatic switching action is not exported"; When the characteristic values ​​of all outgoing switches on the 110kV bus meet the requirements of f 1i =f 2i =0, n i >0,m i =3, the event system synthesizes the event "110kV busbar protection action is successful, all operating switches trip, lower-level substation backup automatic transfer is successful, and there is no load loss".

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