Method for determining the closed position of an operating disconnecting switch for a hot busbar operation

Abstract

The embodiment of the application discloses a method for judging the closing position of an operating isolator during hot bus transfer. The method determines the first three-phase current of the first isolator and the second three-phase current of the second isolator according to the bus transfer interval information, the opening and closing state of the first isolator and the opening and closing state of the second isolator; determines the third three-phase current of the first isolator and the fourth three-phase current of the second isolator according to the outgoing interval information of each outgoing interval, the second bus tie interval information and the connection relationship between each outgoing interval and the first bus and the second bus; and determines whether the three-phase imbalance of the bus loop internal power flow changes according to the first bus tie interval information, the second bus tie interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current, so as to infer and judge the closing position of the operating isolator during hot bus transfer.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of transformer substations, in particular to a method for judging the closing position of an isolation switch in hot bus transfer operation. BACKGROUND

[0002] In recent years, many bus voltage loss or even substation power loss accidents during hot bus transfer operation are caused by the failure to find the tiny gap between the moving and static contacts of the isolation switch after operation, which leads to the disconnection of another bus side isolation switch. However, through the field inspection of the isolation switch position and the background and secondary device indication of the isolation switch position, it is difficult to find the poor contact caused by the tiny gap between the moving and static contacts.

[0003] With the promotion of the integrated control target mode, the lack of real-time and effective monitoring means for the poor contact of the isolation switch has become increasingly prominent, and the misoperation caused by the poor contact of the isolation switch has become a prominent risk restricting the promotion of the programmed operation. Since the programmed operation process does not require human intervention, the existing methods for confirming the closing position of the isolation switch, such as auxiliary contact, micro switch and camera, cannot reliably guarantee the closing position of the isolation switch. SUMMARY

[0004] The embodiment of the present application provides a method for judging the closing position of an isolation switch in hot bus transfer operation, which can realize real-time and accurate monitoring of the closing position of the isolation switch in hot bus transfer operation.

[0005] In the first aspect, the embodiment of the present application provides a method for judging the closing position of an isolation switch in hot bus transfer operation, which comprises the following steps:

[0006] According to the bus topology diagram of the substation to be detected, the first substation information before hot bus transfer operation and the second substation information during hot bus transfer operation are determined; wherein the first substation information comprises bus-to-bus isolation information, first bus tie isolation information, the opening and closing state of the first isolation switch and the opening and closing state of the second isolation switch; the second substation information comprises the out-line interval information of each out-line interval, the second bus tie interval information and the connection relationship between each out-line interval and the first bus and the second bus;

[0007] According to the bus-to-bus isolation information, the opening and closing state of the first isolation switch and the opening and closing state of the second isolation switch of each out-line interval, the first three-phase current of the first isolation switch and the second three-phase current of the second isolation switch are determined;

[0008] determining a third three-phase current of the first disconnector and a fourth three-phase current of the second disconnector according to the outgoing line interval information, the second bus-tie interval information, and a connection relationship between each of the outgoing line intervals and the first bus and the second bus;

[0009] judging a closing position of the disconnector in the hot bus transfer operation according to the first bus-tie interval information, the second bus-tie interval information, the first three-phase current, the second three-phase current, the third three-phase current, and the fourth three-phase current.

[0010] Optionally, the step of determining the first three-phase current of the first disconnector and the second three-phase current of the second disconnector comprises:

[0011] determining the closing switch and the opening switch according to the opening and closing states of the first disconnector and the second disconnector;

[0012] calculating a bus transfer interval three-phase current according to the bus transfer interval information;

[0013] if the first disconnector is the closing switch and the second disconnector is the opening switch, the first three-phase current is the bus transfer interval three-phase current and the second three-phase current is 0;

[0014] if the first disconnector is the opening switch and the second disconnector is the closing switch, the first three-phase current is 0 and the second three-phase current is the bus transfer interval three-phase current.

[0015] Optionally, the bus transfer interval information comprises a bus transfer three-phase current value, a bus transfer active power, and a bus transfer reactive power.

[0016] The step of calculating the bus transfer interval three-phase current comprises:

[0017] determining a bus transfer A-phase phase of the bus transfer interval A-phase current relative to the A-phase bus voltage according to the bus transfer active power and the bus transfer reactive power;

[0018] determining a bus transfer B-phase phase and a bus transfer C-phase phase according to the bus transfer A-phase phase;

[0019] calculating the bus transfer interval three-phase current according to the bus transfer three-phase current value, the bus transfer A-phase phase, the bus transfer B-phase phase, and the bus transfer C-phase phase.

[0020] Optionally, after determining the first substation information before the hot bus transfer operation, and before determining the second substation information during the hot bus transfer operation, the method further comprises:

[0021] determining the disconnector in the hot bus transfer operation according to the opening and closing states of the first disconnector and the second disconnector.

[0022] controlling the hot busbar operation isolator to close.

[0023] Optionally, the step of determining the third three-phase current of the first isolator and the fourth three-phase current of the second isolator comprises:

[0024] calculating a busbar interval three-phase current according to the second busbar interval information;

[0025] calculating an outgoing line interval three-phase current of each of the outgoing line intervals according to the outgoing line interval information of each of the outgoing line intervals;

[0026] determining a first three-phase total current of all the outgoing line intervals connected to the first busbar and a second three-phase total current of all the outgoing line intervals connected to the second busbar according to the connection relationship of each of the outgoing line intervals with the first busbar and the second busbar and the outgoing line interval three-phase current of each of the outgoing line intervals;

[0027] calculating the third three-phase current and the fourth three-phase current according to the first three-phase total current, the second three-phase total current and the busbar interval three-phase current.

[0028] Optionally, the second busbar interval information comprises a second busbar three-phase current value, a busbar active power and a busbar reactive power;

[0029] The step of calculating a busbar interval three-phase current comprises:

[0030] determining a busbar A-phase phase of an A-phase current relative to an A-phase busbar voltage according to the busbar active power and the busbar reactive power;

[0031] determining a busbar B-phase phase and a busbar C-phase phase according to the busbar A-phase phase;

[0032] calculating the busbar interval three-phase current according to the second busbar three-phase current value, the busbar A-phase phase, the busbar B-phase phase and the busbar C-phase phase;

[0033] The outgoing line interval information comprises an outgoing line three-phase current value, an outgoing line active power and an outgoing line reactive power;

[0034] The step of calculating an outgoing line interval three-phase current of each of the outgoing line intervals comprises:

[0035] determining an outgoing line A-phase phase of an A-phase current relative to an A-phase busbar voltage of each of the outgoing line intervals according to the outgoing line active power and the outgoing line reactive power of each of the outgoing line intervals;

[0036] determining a B-phase phase and a C-phase phase of each of the outgoing line intervals according to the outgoing line A-phase phase of each of the outgoing line intervals;

[0037] calculating the outgoing interval three-phase current of each of the outgoing line intervals according to the outgoing line three-phase current value, the outgoing line A-phase phase, the outgoing line B-phase phase and the outgoing line C-phase phase of each of the outgoing line intervals.

[0038] Optionally, the third three-phase current I3 is:

[0039]

[0040] wherein N1 is the total number of all the outgoing line intervals connected with the first busbar, i is the order of the outgoing line interval connected with the first busbar, I i is the outgoing interval three-phase current of the i-th outgoing line interval (i is a positive integer), the outgoing interval three-phase current is in a positive direction flowing out of the first busbar or the second busbar, I M is the bus-tie interval three-phase current, the bus-tie interval three-phase current is in a positive direction flowing from the first busbar to the second busbar;

[0041] The fourth three-phase current I4 is:

[0042]

[0043] wherein N2 is the total number of all the outgoing line intervals connected with the second busbar, j is the order of the outgoing line interval connected with the second busbar, I j is the outgoing interval three-phase current of the j-th outgoing line interval (j is a positive integer).

[0044] Optionally, the step of judging the closing position of the busbar operation isolating switch comprises:

[0045] determining a bus-tie three-phase current change rate according to the first bus-tie interval information and the second bus-tie interval information;

[0046] determining a closing switch according to the opening and closing state of the first isolating switch and the opening and closing state of the second isolating switch;

[0047] if the first isolating switch is the closing switch, determining a first three-phase current change rate according to the first three-phase current and the third three-phase current;

[0048] if the second isolating switch is the closing switch, determining a second three-phase current change rate according to the second three-phase current and the fourth three-phase current;

[0049] determining a first three-phase current unbalance degree according to the third three-phase current;

[0050] determining a first three-phase current unbalance degree according to the third three-phase current;

[0051] determining a second three-phase current unbalance degree according to the fourth three-phase current;

[0052] if the first disconnector is a closing switch, determining a closing position of the disconnector for the hot bus transfer operation according to the bus-tie three-phase current rate of change, the first three-phase current rate of change, the bus-tie three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree;

[0053] if the second disconnector is a closing switch, determining a closing position of the disconnector for the hot bus transfer operation according to the bus-tie three-phase current rate of change, the second three-phase current rate of change, the bus-tie three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree.

[0054] Optionally, the first bus-tie interval information comprises a first bus-tie three-phase current value, the first bus-tie three-phase current value comprising a first bus-tie A-phase current value, a first bus-tie B-phase current value and a first bus-tie C-phase current value;

[0055] the second bus-tie interval information comprises a second bus-tie three-phase current value, the second bus-tie three-phase current value comprising a second bus-tie A-phase current value, a second bus-tie B-phase current value and a second bus-tie C-phase current value;

[0056] the first three-phase current comprises a first A-phase current, a first B-phase current and a first C-phase current;

[0057] the second three-phase current comprises a second A-phase current, a second B-phase current and a second C-phase current;

[0058] the third three-phase current comprises a third A-phase current, a third B-phase current and a third C-phase current;

[0059] the fourth three-phase current comprises a fourth A-phase current, a fourth B-phase current and a fourth C-phase current;

[0060] the bus-tie three-phase current rate of change comprises a bus-tie A-phase current rate of change, a bus-tie B-phase current rate of change and a bus-tie C-phase current rate of change;

[0061] the first three-phase current rate of change comprises a first A-phase current rate of change, a first B-phase current rate of change and a first C-phase current rate of change;

[0062] The second three-phase current rate of change includes a second A-phase current rate of change, a second B-phase current rate of change, and a second C-phase current rate of change.

[0063] The step of determining the three-phase current rate of change of the bus includes:

[0064] According to the first bus A-phase current value and the second bus A-phase current value, the bus A-phase current rate of change is calculated.

[0065] According to the first bus B-phase current value and the second bus B-phase current value, the bus B-phase current rate of change is calculated.

[0066] According to the first bus C-phase current value and the second bus C-phase current value, the bus C-phase current rate of change is calculated.

[0067] The step of determining the first three-phase current rate of change includes:

[0068] According to the first A-phase current and the third A-phase current, the first A-phase current rate of change is calculated.

[0069] According to the first B-phase current and the third B-phase current, the first B-phase current rate of change is calculated.

[0070] According to the first C-phase current and the third C-phase current, the first C-phase current rate of change is calculated.

[0071] The step of determining the second three-phase current rate of change includes:

[0072] According to the second A-phase current and the fourth A-phase current, the second A-phase current rate of change is calculated.

[0073] According to the second B-phase current and the fourth B-phase current, the second B-phase current rate of change is calculated.

[0074] According to the second C-phase current and the fourth C-phase current, the second C-phase current rate of change is calculated.

[0075] The step of determining the three-phase current unbalance degree of the bus includes:

[0076] The maximum bus phase current value and the minimum bus phase current value of the second bus A-phase current value, the second bus B-phase current value, and the second bus C-phase current value are determined.

[0077] According to the maximum bus phase current value and the minimum bus phase current value, the three-phase current unbalance degree of the bus is calculated.

[0078] The step of determining the first three-phase current unbalance degree includes:

[0079] determining first maximum phase current values and first minimum phase current values of the third A-phase current, the third B-phase current and the third C-phase current;

[0080] calculating the first three-phase current unbalance degree according to the first maximum phase current values and the first minimum phase current values;

[0081] the step of determining the second three-phase current unbalance degree comprises:

[0082] determining second maximum phase current values and second minimum phase current values of the fourth A-phase current, the fourth B-phase current and the fourth C-phase current;

[0083] calculating the second three-phase current unbalance degree according to the second maximum phase current values and the second minimum phase current values.

[0084] Optionally, if the first disconnector is a closing switch, judging the closing position of the disconnector for the hot bus transfer operation according to the busbar three-phase current change rate, the first three-phase current change rate, the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree comprises:

[0085] if the busbar three-phase current change rate or the first three-phase current change rate is less than a preset current change rate threshold value, and any one of the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree is greater than a preset unbalance degree threshold value, the disconnector for the hot bus transfer operation is not closed to position; otherwise, the disconnector for the hot bus transfer operation is closed to position;

[0086] if the second disconnector is a closing switch, judging the closing position of the disconnector for the hot bus transfer operation according to the busbar three-phase current change rate, the second three-phase current change rate, the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree comprises:

[0087] if the busbar three-phase current change rate or the second three-phase current change rate is less than a preset current change rate threshold value, and any one of the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree is greater than a preset unbalance degree threshold value, the disconnector for the hot bus transfer operation is not closed to position; otherwise, the disconnector for the hot bus transfer operation is closed to position.

[0088] The embodiment of the present application can determine the first three-phase current of the first disconnecting switch and the second three-phase current of the second disconnecting switch through the reverse busbar interval information, the on-off state of the first disconnecting switch and the on-off state of the second disconnecting switch; determine the third three-phase current of the first disconnecting switch and the fourth three-phase current of the second disconnecting switch according to the outgoing interval information of each outgoing interval, the second busbar interval information and the connection relationship between each outgoing interval and the first busbar and the second busbar; and then determine the current change rate and the three-phase current unbalance degree of the busbar circuit breaker, the first disconnecting switch and the second disconnecting switch according to the first busbar interval information, the second busbar interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current, and then determine whether the busbar loop internal power flow changes, so as to infer whether the closing of the hot reverse busbar operation disconnecting switch is in place. BRIEF DESCRIPTION OF DRAWINGS

[0089] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0090] Figure 1 A flowchart of a hot reverse busbar operation disconnecting switch closing position judgment method provided by the embodiment of the present application;

[0091] Figure 2 A flowchart of a step of determining the first three-phase current of the first disconnecting switch and the second three-phase current of the second disconnecting switch provided by the embodiment of the present application;

[0092] Figure 3 A flowchart of a step of calculating the three-phase current of the reverse busbar interval provided by the embodiment of the present application;

[0093] Figure 4 A flowchart of a step of determining the third three-phase current of the first disconnecting switch and the fourth three-phase current of the second disconnecting switch provided by the embodiment of the present application;

[0094] Figure 5 A flowchart of a step of calculating the three-phase current of the busbar interval provided by the embodiment of the present application;

[0095] Figure 6 A flowchart of a step of calculating the three-phase current of the outgoing interval of each outgoing interval provided by the embodiment of the present application;

[0096] Figure 7 A flowchart of a step of judging the closing position of the hot reverse busbar operation disconnecting switch provided by the embodiment of the present application. Detailed Implementation

[0097] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0098] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0099] Figure 1 This is a flowchart illustrating a method for determining the closing position of a disconnecting switch during a hot busbar transfer operation, provided by an embodiment of the present invention. This embodiment is applicable to situations where the closing of the disconnecting switch is monitored during a hot busbar transfer operation. This method can be implemented using a device for determining the closing position of a disconnecting switch during a hot busbar transfer operation. The method specifically includes the following steps:

[0100] S110. Based on the bus topology diagram of the substation to be tested, determine the first substation information before the hot busbar switching operation and the second substation information during the hot busbar switching operation; wherein, the first substation information includes busbar switching bay information, first bus tie bay information, the opening and closing status of the first disconnecting switch and the opening and closing status of the second disconnecting switch; the second substation information includes the outgoing bay information of each outgoing bay, the second bus tie bay information and the connection relationship between each outgoing bay and the first busbar and the second busbar.

[0101] Specifically, the bus topology graph of the substation to be detected is constructed in advance according to the actual distribution of the substation to be detected. The first substation information refers to the operation information of the bus transfer interval, the bus tie interval and the outgoing line interval of the substation before the hot bus transfer operation. For example, the bus transfer interval information, the first bus tie interval information, the opening and closing states of the first disconnector and the opening and closing states of the second disconnector, and the like. The second substation information refers to the operation information of the bus transfer interval, the bus tie interval and the outgoing line interval of the substation after the hot bus transfer operation. For example, the outgoing line interval information of each outgoing line interval, the second bus tie interval information and the connection relationship between each outgoing line interval and the first bus and the second bus, and the like.

[0102] Wherein, the bus transfer interval refers to the interval device region involved in the bus transfer operation of the power system, and the bus transfer interval information refers to the operating parameters (such as current value and power, etc.) of the interval device involved before the hot bus transfer operation. One disconnector on the bus side of the bus transfer interval is in a closed state, and the other is in an open state, realizing simultaneous connection with one bus. The bus tie interval refers to the interval device region connecting two buses in the power system, and the first bus tie interval information refers to the operating parameters (such as current value and power, etc.) of the interval device connecting two buses before the hot bus transfer operation. The second bus tie interval information refers to the operating parameters (such as current value and power, etc.) of the interval device connecting two buses during the hot bus transfer operation. The disconnector on the bus side of the bus tie interval is in a closed state before the hot bus transfer operation and during the hot bus transfer operation, realizing simultaneous connection with two buses. The first disconnector and the second disconnector refer to the disconnectors on the bus side of the bus transfer interval. The outgoing line interval refers to an important interval region connecting the substation and the external line in the power system, and the outgoing line interval information refers to the operating information (such as current value and power, etc.) of the important interval region device connected with the external line. Each outgoing line interval is connected with a bus during the hot bus transfer operation.

[0103] S120, according to the bus transfer interval information, the opening and closing states of the first disconnector and the opening and closing states of the second disconnector, determining the first three-phase current of the first disconnector and the second three-phase current of the second disconnector.

[0104] Specifically, the connection state of the first disconnector and the second disconnector with the bus before the hot bus transfer operation can be determined according to the on-off state of the first disconnector and the on-off state of the second disconnector. Wherein, only one disconnector is connected with the bus before the hot bus transfer operation, according to the connection state of the first disconnector and the second disconnector with the bus, it can be known that which disconnector is the bus transfer interval information. For example, if the on-off state of the first disconnector is the closed state, it means that the first disconnector is connected with the bus, and thus the bus transfer interval information is the operating parameter of the first disconnector. The on-off state of the second disconnector is the open state, which means that the second disconnector is not connected with the bus, and thus the operating parameter of the second disconnector is 0. If the on-off state of the second disconnector is the closed state, it means that the second disconnector is connected with the bus, and thus the bus transfer interval information is the operating parameter of the second disconnector. The on-off state of the first disconnector is the open state, which means that the first disconnector is not connected with the bus, and thus the operating parameter of the first disconnector is 0.

[0105] In addition, the first three-phase current of the first disconnector can be calculated according to the operating parameter of the first disconnector, and the second three-phase current of the second disconnector can be calculated according to the operating parameter of the second disconnector. For example, if the operating parameter of the first disconnector is the bus transfer interval information, the current value and the power value flowing through the first disconnector can be obtained, and the vector current of the three phases of the first disconnector, i.e. the first three-phase current, can be determined according to the current value and the power value flowing through the first disconnector. The operating parameter of the second disconnector is 0, and thus the second three-phase current is 0. If the operating parameter of the second disconnector is the bus transfer interval information, the current value and the power value flowing through the second disconnector can be obtained, and the vector current of the three phases of the second disconnector, i.e. the second three-phase current, can be determined according to the current value and the power value flowing through the second disconnector. The operating parameter of the first disconnector is 0, and thus the first three-phase current is 0.

[0106] S130, determining the third three-phase current of the first disconnector and the fourth three-phase current of the second disconnector according to the outgoing interval information of each outgoing interval, the second bus tie interval information, and the connection relationship between each outgoing interval and the first bus and the second bus.

[0107] The vector three-phase current of each outgoing interval can be determined according to the outgoing interval information of each outgoing interval, and the vector three-phase current of the bus tie interval during the hot bus transfer operation can be determined according to the second bus tie interval information. The outgoing interval of the first bus outputting the vector three-phase current and the outgoing interval of the second bus outputting the vector three-phase current can be determined according to the connection relationship between each outgoing interval and the first bus and the second bus. The vector current of the third three-phase flowing through the first disconnector and the vector current of the fourth three-phase flowing through the second disconnector during the hot bus transfer operation can be determined according to the characteristic that the input current of each bus is equal to the output current.

[0108] S140, according to the first bus tie interval information, the second bus tie interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current, determining the closing position of the disconnector in the hot bus transfer operation.

[0109] During the hot bus transfer operation, the bus side of the bus tie interval needs to be closed to the disconnector, and at this time, the disconnector may not be closed in place, resulting in poor contact failure of the bus loop and causing the bus loop to fail.

[0110] If the disconnector in the hot bus transfer operation is not closed in place, the bus loop will have a poor contact defect, and the internal power flow of the bus constituting the closed loop will change three-phase unbalance, the current amplitude of the poor contact phase will deviate from the current amplitude of the normal phase, and the current change rate and three-phase current imbalance of the bus tie circuit breaker, the first disconnector and the second disconnector will be abnormal; if the disconnector in the hot bus transfer operation is closed in place, the bus loop has no poor contact defect, and at this time the internal power flow of the bus constituting the closed loop will not change three-phase unbalance, and the current change rate and three-phase current imbalance of the bus tie circuit breaker, the first disconnector and the second disconnector will not be abnormal.

[0111] Specifically, the current change rate of the bus tie circuit breaker can be determined according to the first bus tie interval information and the second bus tie interval information, and the three-phase current imbalance of the bus tie circuit breaker can be determined according to the second bus tie interval information; the current change rate of the first disconnector can be determined according to the first three-phase current and the third three-phase current, and the three-phase imbalance of the first disconnector can be determined according to the third three-phase current; the current change rate of the second disconnector can be determined according to the second three-phase current and the fourth three-phase current, and the three-phase imbalance of the second disconnector can be determined according to the fourth three-phase current.

[0112] The embodiment of the present application can determine the first three-phase current of the first disconnecting switch and the second three-phase current of the second disconnecting switch through the reverse busbar interval information, the on-off state of the first disconnecting switch and the on-off state of the second disconnecting switch; determine the third three-phase current of the first disconnecting switch and the fourth three-phase current of the second disconnecting switch according to the outgoing interval information of each outgoing interval, the second busbar interval information and the connection relationship between each outgoing interval and the first busbar and the second busbar; and then determine the current change rate and the three-phase current unbalance degree of the busbar circuit breaker, the first disconnecting switch and the second disconnecting switch according to the first busbar interval information, the second busbar interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current, and then determine whether the busbar loop internal power flow changes, so as to infer whether the closing of the disconnecting switch in the busbar reverse operation is in place.

[0113] On the basis of the above embodiment, optionally, Figure 2 A flowchart of a step of determining the first three-phase current of the first disconnecting switch and the second three-phase current of the second disconnecting switch provided by the embodiment of the present application is shown. As shown in Figure 2 The step of determining the first three-phase current of the first disconnecting switch and the second three-phase current of the second disconnecting switch is described:

[0114] S210, determine the closing switch and the opening switch according to the on-off state of the first disconnecting switch and the on-off state of the second disconnecting switch.

[0115] Specifically, if the on-off state of the first disconnecting switch is closed and the on-off state of the second disconnecting switch is open, the first disconnecting switch is the closing switch and the second disconnecting switch is the opening switch; if the on-off state of the first disconnecting switch is open and the on-off state of the second disconnecting switch is closed, the first disconnecting switch is the opening switch and the second disconnecting switch is the closing switch.

[0116] S220, calculate the reverse busbar interval three-phase current according to the reverse busbar interval information.

[0117] The reverse busbar interval information includes the reverse busbar three-phase current value, the reverse busbar active power and the reverse busbar reactive power. The reverse busbar interval three-phase current is a vector. Since the phases of the reverse busbar three-phase current cannot be detected, the phase angle of the reverse busbar interval three-phase current can be calculated by using the reverse busbar active power and the reverse busbar reactive power, and the phase of the reverse busbar A-phase current relative to the A-phase busbar voltage is calculated by taking the A-phase busbar voltage as a reference. The phases of the reverse busbar B-phase and C-phase currents can be obtained by calculating the phase of the reverse busbar A-phase current. Then, the reverse busbar interval three-phase current is calculated by using the reverse busbar three-phase current value and the reverse busbar three-phase current phase.

[0118] S230, if the first disconnector is a closing switch and the second disconnector is an opening switch, the first three-phase current is a reversed-phase three-phase current, and the second three-phase current is 0.

[0119] S240, if the first disconnector is an opening switch and the second disconnector is a closing switch, the first three-phase current is 0, and the second three-phase current is a reversed-phase three-phase current.

[0120] Optionally, on the basis of the above-mentioned embodiments, Figure 3 A flowchart of steps for calculating a reversed-phase three-phase current is provided for the embodiments of the present application. As shown in the flowchart, Figure 3 the steps for calculating the reversed-phase three-phase current are described as follows:

[0121] S310, determining a reversed-phase A-phase phase of the reversed-phase A-phase current relative to the A-phase bus voltage according to the reversed-phase active power and the reversed-phase reactive power.

[0122] Specifically, the reversed-phase A-phase phase is determined as follows: wherein Q1 is the reversed-phase reactive power, and P1 is the reversed-phase active power.

[0123] S320, determining a reversed-phase B-phase phase and a reversed-phase C-phase phase according to the reversed-phase A-phase phase.

[0124] wherein the phase difference between the reversed-phase B-phase phase and the reversed-phase A-phase phase is 120°, and the phase difference between the reversed-phase C-phase phase and the reversed-phase A-phase phase is 120°. Thus, the reversed-phase B-phase phase is the reversed-phase C-phase phase is

[0125] S330, calculating the reversed-phase three-phase current according to the reversed-phase three-phase current value, the reversed-phase A-phase phase, the reversed-phase B-phase phase, and the reversed-phase C-phase phase.

[0126] wherein the reversed-phase three-phase current value includes a reversed-phase A-phase current value, a reversed-phase B-phase current value, and a reversed-phase C-phase current value; and the reversed-phase three-phase current includes a reversed-phase A-phase current, a reversed-phase B-phase current, and a reversed-phase C-phase current.

[0127] Thus, the reversed-phase A-phase current can be determined according to the reversed-phase A-phase current value and the reversed-phase A-phase phase; the reversed-phase B-phase current can be determined according to the reversed-phase B-phase current value and the reversed-phase B-phase phase; and the reversed-phase C-phase current can be determined according to the reversed-phase C-phase current value and the reversed-phase C-phase phase.

[0128] Optionally, on the basis of the above-mentioned embodiments, after determining the first substation information before the hot reversed bus operation, and before determining the second substation information during the hot reversed bus operation, the method further comprises:

[0129] According to the on-off states of the first disconnector and the on-off states of the second disconnector, the hot bus transfer operation disconnector is determined.

[0130] Wherein, only one disconnector is connected with the bus before the hot bus transfer operation, and according to the on-off states of the first disconnector and the on-off states of the second disconnector, the on-off switch before the hot bus transfer operation can be determined. During the hot bus transfer operation, the disconnector on the bus side of the bus tie bay is in the closed state, so the on-off switch before the hot bus transfer operation can be determined as the hot bus transfer operation disconnector.

[0131] The hot bus transfer operation disconnector is controlled to be closed.

[0132] Wherein, during the hot bus transfer operation, the disconnector on the bus side of the bus tie bay needs to be in the closed state, that is, it can be realized by controlling the hot bus transfer operation disconnector to be closed.

[0133] On the basis of the above-mentioned embodiments, optionally, Figure 4 A flowchart of a step of determining the third three-phase current of the first disconnector and the fourth three-phase current of the second disconnector is provided for the embodiments of the present application. As shown in the figure, Figure 4 The step of determining the third three-phase current of the first disconnector and the fourth three-phase current of the second disconnector is described as follows:

[0134] S410, according to the second bus tie bay information, the bus tie bay three-phase current is calculated.

[0135] Wherein, the second bus tie bay information includes the second bus tie three-phase current value, the bus tie active power and the bus tie reactive power. The bus tie bay three-phase current is a vector. Since the phase of the three-phase current of the bus tie circuit breaker of the bus tie bay cannot be detected, the phase angle of the three-phase current of the bus tie circuit breaker can be calculated by using the bus tie active power and the bus tie reactive power of the bus tie bay, and the phase of the bus tie A-phase current relative to the A-phase bus voltage is calculated by taking the A-phase bus voltage as a reference-bus tie A-phase phase. The phases of the bus tie B-phase and C-phase currents can be obtained by the bus tie A-phase phase. Thus, the bus tie bay three-phase current can be calculated by the second bus tie three-phase current value, the bus tie A-phase phase, the bus tie B-phase phase and the bus tie C-phase phase.

[0136] S420, according to the outgoing line bay information of each outgoing line bay, the outgoing line bay three-phase current of each outgoing line bay is calculated.

[0137] The line interval information of each line interval includes line three-phase current value, line active power and line reactive power. The line interval three-phase current is a vector. Since the phase of each phase of the line interval three-phase current cannot be detected, the phase angle of the three-phase current of each line interval can be calculated by using the line active power and the line reactive power of each line interval, and the phase of the line A-phase current relative to the A-phase bus voltage is calculated by taking the A-phase bus voltage as a reference to obtain the line A-phase phase. The phases of the line B-phase and C-phase currents can be obtained according to the line A-phase phase. Thus, the line interval three-phase current can be calculated by the line three-phase current value, the line A-phase phase, the line B-phase phase and the line C-phase phase.

[0138] S430, according to the connection relationship of each line interval with the first bus and the second bus and the line interval three-phase current of each line interval, determining the first three-phase total current of all line intervals connected with the first bus and the second three-phase total current of all line intervals connected with the second bus.

[0139] The first three-phase total current refers to the sum of the vector three-phase currents of all line intervals connected with the first bus, and the second three-phase total current refers to the sum of the vector three-phase currents of all line intervals connected with the second bus.

[0140] S440, calculating the third three-phase current and the fourth three-phase current according to the first three-phase total current, the second three-phase total current and the bus interval three-phase current.

[0141] The first three-phase current and the fourth three-phase current of the first disconnector and the second disconnector can be calculated according to the first three-phase total current, the second three-phase total current and the bus interval three-phase current based on the characteristic that the input current and the output current of each bus are equal.

[0142] Specifically, the third three-phase current I3 is:

[0143]

[0144] Wherein, N1 is the total number of all line intervals connected with the first bus, i is the order of the line interval connected with the first bus, I i is the line interval three-phase current of the ith line interval (i is a positive integer), the line interval three-phase current is in the positive direction of flowing out of the first bus or the second bus, I M is the bus interval three-phase current, the bus interval three-phase current is in the positive direction of the first bus and the second bus;

[0145] The fourth three-phase current I4 is:

[0146]

[0147] Wherein, N2 is the total number of all outgoing interval connected with the second bus, j is the order of outgoing interval connected with the second bus, I j is the outgoing interval three-phase current of the jth outgoing interval (j is a positive integer).

[0148] On the basis of the above embodiment, optionally, Figure 5 is a flowchart of the step of calculating the bus interval three-phase current provided by the embodiment of the application. As shown in Figure 5 , the step of calculating the bus interval three-phase current is described:

[0149] S510, according to the bus active power and the bus reactive power, determine the bus A-phase phase of the bus interval A-phase current relative to the A-phase bus voltage.

[0150] Specifically, the bus A-phase phase Wherein, Q2 is the bus reactive power, and P2 is the bus active power.

[0151] S520, according to the bus A-phase phase, determine the bus B-phase phase and the bus C-phase phase.

[0152] Wherein, the phase difference between the bus B-phase phase and the bus A-phase phase is 120°, and the phase difference between the bus C-phase phase and the bus A-phase phase is 120°. Thus, the bus B-phase phase the bus C-phase phase

[0153] S530, according to the second bus three-phase current value, the bus A-phase phase, the bus B-phase phase and the bus C-phase phase, calculate the bus interval three-phase current.

[0154] Wherein, the second bus three-phase current value includes the second bus A-phase current value, the second bus B-phase current value and the second bus C-phase current value; the bus interval three-phase current includes the bus interval A-phase current, the bus interval B-phase current and the bus interval C-phase current;

[0155] Thus, according to the second bus A-phase current value and the bus A-phase phase, the bus interval A-phase current can be determined; according to the second bus B-phase current value and the bus A-phase phase, the bus interval B-phase current can be determined; according to the second bus C-phase current value and the bus C-phase phase, the bus interval C-phase current can be determined.

[0156] On the basis of the above embodiment, optionally, Figure 6 is a flowchart of the step of calculating the outgoing interval three-phase current of each outgoing interval provided by the embodiment of the application. As shown in Figure 6 , the step of calculating the outgoing interval three-phase current of each outgoing interval is described:

[0157] S610, determine the outgoing A-phase phase of each outgoing interval according to the outgoing active power and the outgoing reactive power of each outgoing interval.

[0158] Specifically, the outgoing A-phase phase of each outgoing interval is determined according to the outgoing active power and the outgoing reactive power of each outgoing interval. Wherein, Q3 is the outgoing reactive power, and P3 is the outgoing active power.

[0159] S620, determine the outgoing B-phase phase and the outgoing C-phase phase of each outgoing interval according to the outgoing A-phase phase of each outgoing interval.

[0160] Wherein, the phase difference between the outgoing B-phase phase and the outgoing A-phase phase is 120°, and the phase difference between the outgoing C-phase phase and the outgoing A-phase phase is 120°. Thus, the outgoing B-phase phase is the outgoing C-phase phase is

[0161] S630, calculate the outgoing interval three-phase current of each outgoing interval according to the outgoing three-phase current value, the outgoing A-phase phase, the outgoing B-phase phase and the outgoing C-phase phase of each outgoing interval.

[0162] Wherein, the outgoing three-phase current value includes the outgoing A-phase current value, the outgoing B-phase current value and the outgoing C-phase current value; and the outgoing interval three-phase current includes the outgoing interval A-phase current, the outgoing interval B-phase current and the outgoing interval C-phase current.

[0163] Thus, the outgoing interval A-phase current can be determined according to the outgoing A-phase current value and the outgoing A-phase phase; the outgoing interval B-phase current can be determined according to the outgoing B-phase current value and the outgoing B-phase phase; and the outgoing interval C-phase current can be determined according to the outgoing C-phase current value and the outgoing C-phase phase.

[0164] In addition, the third three-phase current includes the third A-phase current, the third B-phase current and the third C-phase current.

[0165] Specifically, the third A-phase current I 3A is:

[0166]

[0167] Wherein, N1 is the total number of all outgoing intervals connected with the first busbar, i is the order of the outgoing interval connected with the first busbar, I iA is the outgoing interval A-phase current of the i-th outgoing interval (i is a positive integer), and I MA is the bus tie interval A-phase current.

[0168] Specifically, the third B-phase current I 3B is:

[0169]

[0170] wherein N1 is the total number of all outgoing line intervals connected with the first busbar, i is the ranking of the outgoing line interval connected with the first busbar, I iB is the outgoing line interval B-phase current of the i-th outgoing line interval (i is a positive integer), I MB is the busbar interval B-phase current.

[0171] In particular, the third C-phase current I 3C is:

[0172]

[0173] wherein N1 is the total number of all outgoing line intervals connected with the first busbar, i is the ranking of the outgoing line interval connected with the first busbar, I iC is the outgoing line interval C-phase current of the i-th outgoing line interval (i is a positive integer), I MC is the busbar interval C-phase current.

[0174] In addition, the fourth three-phase current comprises a fourth A-phase current, a fourth B-phase current and a fourth C-phase current.

[0175] In particular, the fourth A-phase current I 4A is:

[0176]

[0177] wherein N2 is the total number of all outgoing line intervals connected with the second busbar, j is the ranking of the outgoing line interval connected with the second busbar, I jA is the outgoing line interval A-phase current of the j-th outgoing line interval (j is a positive integer), I MA is the busbar interval A-phase current.

[0178] In particular, the fourth B-phase current I 4B is:

[0179]

[0180] wherein N2 is the total number of all outgoing line intervals connected with the second busbar, j is the ranking of the outgoing line interval connected with the second busbar, I jB is the outgoing line interval B-phase current of the j-th outgoing line interval (j is a positive integer), I MB is the busbar interval B-phase current.

[0181] In particular, the fourth C-phase current I 4C is:

[0182]

[0183] Wherein, N2 is the total number of all outgoing interval connected with the second bus, j is the order of outgoing interval connected with the second bus, I jC is the outgoing interval C-phase current of the jth outgoing interval (j is a positive integer), I MC is the bus tie interval C-phase current.

[0184] On the basis of the above-mentioned embodiments, optionally, Figure 7 is a flowchart of a step of judging the closing position of the disconnecting switch of the hot reverse bus operation provided by the embodiments of the present application. As Figure 7 shown, the step of judging the closing position of the disconnecting switch of the hot reverse bus operation is described:

[0185] S710, determining the bus tie three-phase current rate of change according to the first bus tie interval information and the second bus tie interval information.

[0186] Wherein, the first bus tie interval information includes the first bus tie three-phase current value, and the first bus tie three-phase current value includes the first bus tie A-phase current value, the first bus tie B-phase current value and the first bus tie C-phase current value;

[0187] The second bus tie interval information includes the second bus tie three-phase current value, and the second bus tie three-phase current value includes the second bus tie A-phase current value, the second bus tie B-phase current value and the second bus tie C-phase current value;

[0188] The bus tie three-phase current rate of change includes the bus tie A-phase current rate of change, the bus tie B-phase current rate of change and the bus tie C-phase current rate of change.

[0189] The step of determining the bus tie three-phase current rate of change includes:

[0190] According to the first bus tie A-phase current value and the second bus tie A-phase current value, the bus tie A-phase current rate of change is calculated.

[0191] Specifically, the bus tie A-phase current rate of change = (the second bus tie A-phase current value - the first bus tie A-phase current value) / the first bus tie A-phase current value.

[0192] According to the first bus tie B-phase current value and the second bus tie B-phase current value, the bus tie B-phase current rate of change is calculated.

[0193] Specifically, the bus tie B-phase current rate of change = (the second bus tie B-phase current value - the first bus tie B-phase current value) / the first bus tie B-phase current value.

[0194] According to the first bus tie C-phase current value and the second bus tie C-phase current value, the bus tie C-phase current rate of change is calculated.

[0195] Specifically, the bus tie C-phase current rate of change = (the second bus tie C-phase current value - the first bus tie C-phase current value) / the first bus tie C-phase current value.

[0196] S720, determining the closing switch according to the opening / closing state of the first disconnector and the opening / closing state of the second disconnector.

[0197] If the opening / closing state of the first disconnector is closed, the first disconnector is the closing switch; if the opening / closing state of the second disconnector is closed, the second disconnector is the closing switch.

[0198] S730, if the first disconnector is the closing switch, determining the first three-phase current rate of change according to the first three-phase current and the third three-phase current.

[0199] The first three-phase current includes a first A-phase current, a first B-phase current and a first C-phase current. The third three-phase current includes a third A-phase current, a third B-phase current and a third C-phase current; the first three-phase current rate of change includes a first A-phase current rate of change, a first B-phase current rate of change and a first C-phase current rate of change.

[0200] The step of determining the first three-phase current rate of change includes:

[0201] According to the first A-phase current and the third A-phase current, the first A-phase current rate of change is calculated.

[0202] Specifically, the first A-phase current rate of change = (third A-phase current - first A-phase current) / first A-phase current.

[0203] According to the first B-phase current and the third B-phase current, the first B-phase current rate of change is calculated.

[0204] Specifically, the first B-phase current rate of change = (third B-phase current - first B-phase current) / first B-phase current.

[0205] According to the first C-phase current and the third C-phase current, the first C-phase current rate of change is calculated.

[0206] Specifically, the first C-phase current rate of change = (third C-phase current - first C-phase current) / first C-phase current.

[0207] S740, if the second disconnector is the closing switch, determining the second three-phase current rate of change according to the second three-phase current and the fourth three-phase current.

[0208] The second three-phase current includes a second A-phase current, a second B-phase current and a second C-phase current; the fourth three-phase current includes a fourth A-phase current, a fourth B-phase current and a fourth C-phase current; the second three-phase current rate of change includes a second A-phase current rate of change, a second B-phase current rate of change and a second C-phase current rate of change.

[0209] The step of determining the second three-phase current rate of change includes:

[0210] According to the second A-phase current and the fourth A-phase current, a second A-phase current rate of change is calculated.

[0211] Specifically, the second A-phase current rate of change = (fourth A-phase current-second A-phase current) / second A-phase current.

[0212] According to the second B-phase current and the fourth B-phase current, a second B-phase current rate of change is calculated.

[0213] Specifically, the second B-phase current rate of change = (fourth B-phase current-second B-phase current) / second B-phase current.

[0214] According to the second C-phase current and the fourth C-phase current, a second C-phase current rate of change is calculated.

[0215] Specifically, the second C-phase current rate of change = (fourth C-phase current-second C-phase current) / second C-phase current.

[0216] S750, according to the second bus coupler interval information, determine the bus coupler three-phase current imbalance degree.

[0217] Among them, the second bus coupler interval information includes the second bus coupler three-phase current value, and the second bus coupler three-phase current value includes the second bus coupler A-phase current value, the second bus coupler B-phase current value and the second bus coupler C-phase current value.

[0218] The step of determining the bus coupler three-phase current imbalance degree includes:

[0219] Determine the maximum bus coupler phase current value and the minimum bus coupler phase current value of the second bus coupler A-phase current value, the second bus coupler B-phase current value and the second bus coupler C-phase current value.

[0220] According to the maximum bus coupler phase current value and the minimum bus coupler phase current value, the bus coupler three-phase current imbalance degree is calculated; specifically, the bus coupler three-phase current imbalance degree

[0221] Among them, P A is the second bus coupler A-phase current value, P B is the second bus coupler B-phase current value, and P C is the second bus coupler C-phase current value.

[0222] S760, according to the third three-phase current, determine the first three-phase current imbalance degree.

[0223] Among them, the step of determining the first three-phase current imbalance degree includes:

[0224] Determine the first maximum phase current value and the first minimum phase current value of the third A-phase current, the third B-phase current and the third C-phase current.

[0225] According to the first maximum phase current value and the first minimum phase current value, a first three-phase current unbalance degree is calculated.

[0226] Specifically, the first three-phase current unbalance degree

[0227] Wherein, X A is the third A-phase current, X B is the third B-phase current, X C is the third C-phase current, max(X A , X B , X C ) is the first maximum phase current value, and min(X A , X B , X C ) is the first minimum phase current value.

[0228] S770, according to the fourth three-phase current, a second three-phase current unbalance degree is determined.

[0229] Wherein, the step of determining the second three-phase current unbalance degree comprises:

[0230] determining a second maximum phase current value and a second minimum phase current value of a fourth A-phase current, a fourth B-phase current and a fourth C-phase current;

[0231] According to the second maximum phase current value and the second minimum phase current value, a second three-phase current unbalance degree is calculated.

[0232] Specifically, the second three-phase current unbalance degree

[0233] Wherein, Y A is the fourth A-phase current, Y B is the fourth B-phase current, Y C is the fourth C-phase current, max(Y A , Y B , Y C ) is the second maximum phase current value, and min(Y A , Y B , Y C ) is the second minimum phase current value.

[0234] S780, if the first disconnector is a closing switch, according to the busbar three-phase current rate of change, the first three-phase current rate of change, the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree, the closing position of the hot bus transfer disconnector is judged.

[0235] Specifically, if the busbar three-phase current rate of change or the first three-phase current rate of change is less than the preset current rate of change threshold, and any one of the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree is greater than the preset unbalance degree threshold, the hot transfer bus operation disconnector fails to close; otherwise, the hot transfer bus operation disconnector closes in place.

[0236] Exemplarily, if the preset current rate of change threshold is 25% and the preset unbalance degree threshold is 85%, when the busbar three-phase current rate of change or the first three-phase current rate of change is less than 25%, and any one of the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree is greater than 85%, the hot transfer bus operation disconnector fails to close; otherwise, the hot transfer bus operation disconnector closes in place.

[0237] S790, if the second disconnector is a closing switch, the closing position of the hot transfer bus operation disconnector is determined according to the busbar three-phase current rate of change, the second three-phase current rate of change, the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree.

[0238] Specifically, if the busbar three-phase current rate of change or the second three-phase current rate of change is less than the preset current rate of change threshold, and any one of the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree is greater than the preset unbalance degree threshold, the hot transfer bus operation disconnector fails to close; otherwise, the hot transfer bus operation disconnector closes in place.

[0239] Exemplarily, if the preset current rate of change threshold is 25% and the preset unbalance degree threshold is 85%, when the busbar three-phase current rate of change or the second three-phase current rate of change is less than 25%, and any one of the busbar three-phase current unbalance degree, the first three-phase current unbalance degree and the second three-phase current unbalance degree is greater than 85%, the hot transfer bus operation disconnector fails to close; otherwise, the hot transfer bus operation disconnector closes in place.

[0240] It should be understood that the various forms of flow shown above can be reordered, added to, or have steps deleted. For example, the steps described in the present application can be executed in parallel, in series, or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0241] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining the closing position of a disconnecting switch during hot busbar operation, characterized in that, include: Based on the bus topology diagram of the substation to be tested, determine the first substation information before the hot busbar switching operation and the second substation information during the hot busbar switching operation. The first substation information includes busbar switching bay information, first bus tie bay information, the opening and closing status of the first disconnecting switch, and the opening and closing status of the second disconnecting switch. The second substation information includes the outgoing bay information of each outgoing bay, the second bus tie bay information, and the connection relationship between each outgoing bay and the first and second busbars. The busbar switching bay information refers to the operating parameters of the bay equipment involved before the hot busbar switching operation; the first bus tie bay information refers to the operating parameters of the bay equipment connecting two busbar sections before the hot busbar switching operation; the second bus tie bay information refers to the operating parameters of the bay equipment connecting two busbar sections during the hot busbar switching operation; the outgoing bay information refers to the operating information of important bay area equipment connected to external lines; and the first and second disconnecting switches refer to the disconnecting switches on the busbar side of the busbar switching bay. Based on the busbar spacing information, the opening and closing status of the first disconnector switch and the opening and closing status of the second disconnector switch, determine the first three-phase current of the first disconnector switch and the second three-phase current of the second disconnector switch; Based on the outgoing interval information of each outgoing interval, the second bus tie interval information, and the connection relationship between each outgoing interval and the first bus and the second bus, the third three-phase current of the first disconnecting switch and the fourth three-phase current of the second disconnecting switch are determined. Based on the first bus tie interval information, the second bus tie interval information, the first three-phase current, the second three-phase current, the third three-phase current, and the fourth three-phase current, determine the closing position of the hot bus tie operation disconnect switch; The step of determining the first three-phase current of the first disconnecting switch and the second three-phase current of the second disconnecting switch includes: Based on the opening and closing status of the first disconnecting switch and the second disconnecting switch, determine the closing switch and the opening switch; Calculate the three-phase current of the busbar spacing based on the busbar spacing information; If the first disconnecting switch is a closing switch and the second disconnecting switch is a opening switch, then the first three-phase current is the three-phase current of the busbar interval, and the second three-phase current is 0. If the first disconnecting switch is a tripping switch and the second disconnecting switch is a closing switch, then the first three-phase current is 0, and the second three-phase current is the three-phase current of the busbar interval. The steps for determining the third three-phase current of the first disconnecting switch and the fourth three-phase current of the second disconnecting switch include: Calculate the three-phase current of the bus tie interval based on the second bus tie interval information; Calculate the three-phase current of each outgoing line interval based on the outgoing line interval information of each outgoing line interval; Based on the connection relationship between each outgoing line bay and the first busbar and the second busbar, and the three-phase current of each outgoing line bay, determine the first three-phase total current of all outgoing line bays connected to the first busbar and the second three-phase total current of all outgoing line bays connected to the second busbar. Calculate the third three-phase current and the fourth three-phase current based on the first three-phase total current, the second three-phase total current, and the three-phase current of the bus tie interval; The step of determining the closing position of the disconnecting switch during hot busbar operation includes: The three-phase current change rate of the bus tie is determined based on the first bus tie interval information and the second bus tie interval information; The closing switch is determined based on the opening and closing status of the first disconnecting switch and the second disconnecting switch; If the first disconnecting switch is a closing switch, then the rate of change of the first three-phase current is determined based on the first three-phase current and the third three-phase current; If the second disconnecting switch is a closing switch, then the rate of change of the second three-phase current is determined based on the second three-phase current and the fourth three-phase current; Based on the second bus tie interval information, determine the three-phase current imbalance of the bus tie; The imbalance of the first three-phase current is determined based on the third three-phase current. The unbalance of the second and third phase currents is determined based on the fourth three-phase current. If the first disconnecting switch is a closing switch, then the closing position of the hot busbar operation disconnecting switch is determined based on the bus tie three-phase current change rate, the first three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance, and the second three-phase current imbalance. If the second disconnecting switch is a closing switch, then the closing position of the hot busbar operation disconnecting switch is determined based on the bus tie three-phase current change rate, the second three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance, and the second three-phase current imbalance.

2. The method for determining the closing position of a disconnecting switch during hot busbar operation according to claim 1, characterized in that, The busbar spacing information includes the busbar three-phase current value, busbar active power, and busbar reactive power. The steps for calculating the three-phase current of the busbar gap include: Based on the active power and reactive power of the busbar, determine the phase of the busbar A-phase current relative to the busbar A-phase voltage; Based on the phase of the reverse mother A, determine the phase of the reverse mother B and the phase of the reverse mother C; The three-phase current of the inverted busbar is calculated based on the three-phase current values ​​of the inverted busbar, the phase of phase A of the inverted busbar, the phase of phase B of the inverted busbar, and the phase of phase C of the inverted busbar.

3. The method for determining the closing position of a disconnecting switch during hot busbar operation according to claim 1, characterized in that, After determining the first substation information before the hot busbar switching operation and before determining the second substation information during the hot busbar switching operation, the process also includes: Based on the opening and closing status of the first disconnecting switch and the second disconnecting switch, determine the hot busbar operation disconnecting switch; Control the closing of the hot busbar operation isolating switch.

4. The method for determining the closing position of a disconnecting switch during hot busbar operation according to claim 1, characterized in that, The second bus tie interval information includes the three-phase current value of the second bus tie, the active power of the bus tie, and the reactive power of the bus tie; The steps for calculating the three-phase current of the bus tie interval include: Based on the active power and reactive power of the bus tie, determine the phase of the A-phase current of the bus tie interval relative to the A-phase bus voltage; Based on the phase of phase A of the bus coupler, determine the phase of phase B and phase C of the bus coupler; Calculate the three-phase current of the bus tie interval based on the three-phase current value of the second bus tie, the phase of phase A of the bus tie, the phase of phase B of the bus tie, and the phase of phase C of the bus tie; The outgoing line interval information includes the outgoing three-phase current value, outgoing active power, and outgoing reactive power. The step of calculating the three-phase current of each of the outgoing line intervals includes: Based on the active power and reactive power of each outgoing line interval, determine the outgoing A-phase phase of the current in each outgoing line interval relative to the A-phase bus voltage. Based on the phase A phase of each outgoing line interval, determine the phase B phase and phase C phase of each outgoing line interval. The three-phase current of each outgoing line interval is calculated based on the outgoing three-phase current value, the phase of outgoing line A, the phase of outgoing line B, and the phase of outgoing line C of each outgoing line interval.

5. The method for determining the closing position of a disconnecting switch during hot busbar operation according to claim 1, characterized in that, The third three-phase current for: ； in, Let i be the total number of all outgoing cable bays connected to the first busbar, and let i be the order of the outgoing cable bays connected to the first busbar. Let i be the three-phase current of the i-th outgoing line bay, where i is a positive integer. The positive direction of the three-phase current of the outgoing line bay is the direction in which it flows out of the first busbar or the second busbar. The three-phase current in the bus tie interval is defined as the positive direction of the three-phase current flowing from the first busbar to the second busbar. The fourth three-phase current for: ； in, Let j be the total number of all outgoing cable bays connected to the second busbar, and j be the sorting order of the outgoing cable bays connected to the second busbar. Let j be the three-phase current of the j-th outgoing line interval, where j is a positive integer.

6. The method for determining the closing position of a disconnecting switch during hot busbar operation according to claim 1, characterized in that, The first bus tie interval information includes the three-phase current values ​​of the first bus tie, which include the A-phase current value, the B-phase current value, and the C-phase current value of the first bus tie. The second bus tie interval information includes the three-phase current values ​​of the second bus tie, which include the A-phase current value, the B-phase current value, and the C-phase current value of the second bus tie. The first three-phase current includes the first phase A current, the first phase B current, and the first phase C current; The second three-phase current includes the second phase A current, the second phase B current, and the second phase C current; The third three-phase current includes the third phase A current, the third phase B current, and the third phase C current; The fourth three-phase current includes the fourth phase A current, the fourth phase B current, and the fourth phase C current; The bus tie three-phase current change rate includes the bus tie phase A current change rate, the bus tie phase B current change rate and the bus tie phase C current change rate; The first three-phase current change rate includes the first phase A current change rate, the first phase B current change rate, and the first phase C current change rate; The second three-phase current change rate includes the second phase A current change rate, the second phase B current change rate, and the second phase C current change rate; The step of determining the rate of change of the three-phase current in the bus tie includes: Calculate the rate of change of the phase A current of the bus tie based on the first phase A current value and the second phase A current value of the bus tie; Calculate the rate of change of the B-phase current of the bus tie based on the first bus tie phase B current value and the second bus tie phase B current value; Calculate the rate of change of the C-phase current of the bus tie based on the first bus tie C-phase current value and the second bus tie C-phase current value; The step of determining the rate of change of the first three-phase current includes: Calculate the rate of change of the first phase A current based on the first phase A current and the third phase A current; Calculate the rate of change of the first phase B current based on the first phase B current and the third phase B current; Calculate the rate of change of the first phase C current based on the first phase C current and the third phase C current; The step of determining the rate of change of the second three-phase current includes: Calculate the rate of change of the second phase A current based on the second phase A current and the fourth phase A current; Calculate the rate of change of the second phase B current based on the second phase B current and the fourth phase B current; Calculate the rate of change of the second phase C current based on the second phase C current and the fourth phase C current; The steps for addressing the three-phase current imbalance in the bus tie include: Determine the maximum and minimum bus tie phase current values ​​for the second bus tie phase A current value, the second bus tie phase B current value, and the second bus tie phase C current value; The bus tie three-phase current imbalance is calculated based on the maximum bus tie phase current value and the minimum bus tie phase current value. The steps for the first three-phase current imbalance include: Determine the first maximum phase current value and the first minimum phase current value of the third phase A current, the third phase B current, and the third phase C current; The first three-phase current imbalance is calculated based on the first maximum phase current value and the first minimum phase current value. The steps for the second and third phase current imbalance include: Determine the second maximum phase current value and the second minimum phase current value of the fourth phase A current, the fourth phase B current, and the fourth phase C current; The second three-phase current imbalance is calculated based on the second maximum phase current value and the second minimum phase current value.

7. The method for determining the closing position of a disconnecting switch during hot busbar operation according to claim 1, characterized in that, If the first disconnecting switch is a closing switch, then based on the bus tie three-phase current change rate, the first three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance, and the second three-phase current imbalance, the closing position of the hot busbar operation disconnecting switch is determined, including: If the change rate of the three-phase current of the bus tie or the change rate of the first three-phase current is less than the preset current change rate threshold, and any one of the unbalance of the three-phase current of the bus tie, the unbalance of the first three-phase current, and the unbalance of the second three-phase current is greater than the preset unbalance threshold, then the hot bus tie operation isolating switch will not close properly; otherwise, the hot bus tie operation isolating switch will close properly. If the second disconnecting switch is a closing switch, then based on the bus tie three-phase current change rate, the second three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance, and the second three-phase current imbalance, the closing position of the hot bus tie operation disconnecting switch is determined, including: If the rate of change of the three-phase current of the bus tie or the rate of change of the second three-phase current is less than the preset current rate of change threshold, and any one of the unbalance of the three-phase current of the bus tie, the unbalance of the first three-phase current, and the unbalance of the second three-phase current is greater than the preset unbalance threshold, then the hot bus tie operation isolating switch will not be closed; otherwise, the hot bus tie operation isolating switch will be closed.

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