Isolation switch detection method and device during hot bus switching operation of transformer substation

Abstract

The invention discloses a method and a device for detecting an isolating switch during hot bus switching operation of a transformer substation. The invention discloses an isolating switch detection method during hot switching bus operation of a transformer substation. The method comprises the following steps: acquiring bus-side isolating switch position state information of each circuit breaker interval in a hot switching bus; according to the bus side isolation switch position state information, obtaining each phase current value of each circuit breaker interval and each phase current value of a bus tie circuit breaker during hot bus switching; determining the closing state of each phase in the disconnecting switch according to the current value of each phase and the current value of each phase of the bus tie circuit breaker; or determining the closing state of each phase in the isolating switch according to the current value of each phase of the bus tie circuit breaker. The problem that a bus-side disconnecting switch is not closed in place during hot bus switching operation is solved, the closing state of each phase of the bus-side disconnecting switch is accurately judged, and safe and stable operation of a power grid is ensured.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method and a device for detecting an isolating switch during hot-reversal operation of a transformer substation. Background Art

[0002] With the advancement of the integration of power dispatching and control, the operation of main network equipment has gradually shifted from on-site operation to remote control operation at the dispatching end. Therefore, when operating the disconnector remotely, it is very important to confirm the closing state of the disconnector. Although there are "double confirmation" measures for the disconnector position, the remote signal of the dispatching master station automation system is used to confirm the position of the disconnector, and the three-phase current telemetry data is used to judge the closing state of the disconnector after the operation is completed. However, there is also a situation where one phase of the disconnector is not closed in place or has poor contact during hot reverse bus, which causes the load-pulling disconnector to cause busbar pressure loss, which seriously affects the safe and stable operation of the substation and even the power grid. Summary of the invention

[0003] The present invention provides a method and device for detecting disconnectors during hot-reversal operation of a substation, so as to solve the problem that disconnectors cannot be closed properly during hot-reversal operation, realize accurate judgment of the closing status of each phase of the disconnectors, and ensure safe and stable operation of the power grid.

[0004] According to one aspect of the present invention, a disconnector detection method for a substation during hot bus reverse operation is provided, which is applied to a disconnector detection device for a substation during hot bus reverse operation. The substation includes a plurality of circuit breaker bay combinations, wherein the circuit breaker bay combinations include at least a bus, a bus tie circuit breaker, and a plurality of circuit breaker bays. The bus includes a first bus and a second bus, wherein the bus tie circuit breaker is electrically connected between the first bus and the second bus, and a plurality of circuit breaker bays are mounted on the first bus and the second bus. The circuit breaker bay includes two bus side disconnectors, wherein the two bus side disconnectors are respectively mounted on the first bus and the second bus. The disconnector detection method for a substation during hot bus reverse operation includes:

[0005] Collect the position status information of the busbar-side disconnector of each circuit breaker interval in the hot-reverse busbar;

[0006] According to the position status information of the isolating switch on the bus side, the current values ​​of each phase of each circuit breaker interval and the current values ​​of each phase of the bus tie circuit breaker are obtained when the bus is thermally reversed;

[0007] The closing state of each phase in the bus side disconnector is determined according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker; or, the closing state of each phase in the bus side disconnector is determined according to the current values ​​of each phase of the bus tie circuit breaker.

[0008] Optionally, the bus-side disconnector position status information includes whether one of the bus-side disconnectors is in an open state and whether all of the bus-side disconnectors are in a closed state;

[0009] According to the position status information of the busbar side disconnector, the current values ​​of each phase of each circuit breaker interval and the current values ​​of each phase of the bus tie circuit breaker are obtained, including:

[0010] When there is a busbar-side disconnecting switch in an open state, obtaining the first phase current value of each of the circuit breaker intervals and the first bus tie circuit breaker phase current value before the thermal collapse of the busbar;

[0011] When the bus-side disconnectors are all in a closed state, the second phase current values ​​of each circuit breaker interval in the thermally reversed bus and the second bus tie circuit breaker phase current values ​​are obtained.

[0012] Optionally, determining the closing state of each phase in the bus-side disconnector according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker includes:

[0013] Obtaining first phase current difference values ​​of each of the circuit breaker intervals before thermal bus failure according to the first phase current values ​​and the first bus tie circuit breaker phase current values;

[0014] Obtaining second phase current difference values ​​of each of the circuit breaker intervals in the thermal reverse bus according to the second phase current values ​​and the second bus tie circuit breaker phase current values;

[0015] The closing state of each phase in the bus-side disconnector is determined according to the first phase current difference value and the second phase current difference value.

[0016] Optionally, the first current values ​​of each phase include the first sub-phase current values ​​of each circuit breaker interval before the thermal reverse bus hung on the first bus and the second sub-phase current values ​​of each circuit breaker interval device before the thermal reverse bus hung on the second bus; the first current difference value of each phase includes the first sub-phase current difference value and the second sub-phase current difference value; the second current value of each phase includes the third sub-phase current value of each circuit breaker interval in the thermal reverse bus hung on the first bus and the fourth sub-phase current value of each circuit breaker interval in the thermal reverse bus hung on the second bus; the second current difference value of each phase includes the third sub-phase current difference value and the fourth sub-phase current difference value;

[0017] Obtaining first phase current difference values ​​of each of the circuit breaker intervals before thermal bus failure according to the first phase current values ​​and the first bus tie circuit breaker phase current values, including:

[0018] Obtaining the first sub-phase current difference value of each of the circuit breakers on the first bus before thermal collapse according to the first sub-phase current value and the first bus tie circuit breaker current value;

[0019] Obtain the second sub-phase current difference value of each of the circuit breakers on the second bus before thermal collapse according to the second sub-phase current value and the first bus tie circuit breaker phase current value;

[0020] The method of obtaining the second phase current difference value of each of the circuit breaker intervals in the thermal reverse bus according to the second phase current value and the second bus tie circuit breaker phase current value comprises:

[0021] Obtain the third sub-phase current difference value of each of the circuit breakers in the thermal busbar on the first busbar according to the third sub-phase current value and the second busbar current value;

[0022] Obtain the fourth sub-phase current difference value of each of the circuit breakers in the thermal busbar on the second busbar according to the fourth sub-phase current value and the second busbar current value;

[0023] Determining the closing state of each phase in the bus-side disconnector according to the first phase current difference value and the second phase current difference value includes:

[0024] Determine the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value and the third sub-phase current difference value;

[0025] The closing state of each phase in the bus-side disconnector is determined according to the second sub-phase current difference value and the fourth sub-phase current difference value.

[0026] Optionally, before determining the closing state of each phase in the bus-side disconnector according to the first phase current difference value and the second phase current difference value, the method further includes:

[0027] Obtaining a first preset phase differential current ratio value corresponding to the first bus and a second preset phase differential current ratio value corresponding to the second bus;

[0028] Determining the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value and the third sub-phase current difference value includes:

[0029] Determine the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value, the third sub-phase current difference value and the first preset phase current difference ratio;

[0030] Determining the closing state of each phase in the bus-side disconnector according to the second sub-phase current difference value and the fourth sub-phase current difference absolute value includes:

[0031] The closing state of each phase in the bus-side disconnector is determined according to the second sub-phase current difference value, the fourth sub-phase current difference value and the second preset phase current difference ratio.

[0032] Optionally, after determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the bus tie circuit breaker, the method further includes:

[0033] The closing state of each phase in the bus-side disconnector is determined according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker.

[0034] Optionally, before determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker, the method further includes:

[0035] Obtaining a third preset phase differential current ratio corresponding to the bus tie circuit breaker;

[0036] Determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker includes:

[0037] The closing state of each phase in the bus-side disconnector is determined according to the current value of each phase of the first bus tie circuit breaker, the current value of each phase of the second bus tie circuit breaker and the third preset phase difference current ratio value.

[0038] Optionally, the closing state of each phase in the bus-side disconnector is determined according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker; or, after determining the closing state of each phase in the bus-side disconnector according to the current values ​​of each phase of the bus tie circuit breaker, the method further includes:

[0039] When it is determined that at least one phase of the busbar-side disconnector is in a state of incomplete closing or poor contact, an alarm signal is output.

[0040] According to another aspect of the present invention, a disconnector detection device during hot-flip operation of a substation is provided, comprising a disconnector detection method during hot-flip operation of a substation as described in any one of the above aspects.

[0041] Optionally, the isolating switch detection device during the hot-reversal operation of the substation includes:

[0042] The busbar side disconnector position status information collection module is used to collect the busbar side disconnector position status information of each circuit breaker interval in the hot-flip busbar;

[0043] A module for acquiring current values ​​of each phase, used for acquiring the current values ​​of each phase of each circuit breaker interval and the current values ​​of each phase of the bus tie circuit breaker when the bus is thermally reversed according to the position status information of the isolating switch on the bus side;

[0044] A module for determining the closing status of each phase of the bus-side disconnector is used to determine the closing status of each phase in the bus-side disconnector according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker; or, to determine the closing status of each phase in the bus-side disconnector according to the current values ​​of each phase of the bus tie circuit breaker.

[0045] The technical solution of the embodiment of the present invention provides a method for detecting isolating switches during hot bus reverse operation of a substation, including: collecting the position status information of the isolating switches on the bus side of each circuit breaker interval in the hot bus reverse operation; obtaining the current values ​​of each phase of each circuit breaker interval and the current values ​​of each phase of the bus tie circuit breaker during the hot bus reverse operation according to the position status information of the isolating switches on the bus side; determining the closing status of each phase in the isolating switches on the bus side according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker; or determining the closing status of each phase in the isolating switches on the bus side according to the current values ​​of each phase of the bus tie circuit breaker. This solves the problem of the bus side isolating switches not being closed properly during the hot bus reverse operation, realizes the accurate judgment of the closing status of each phase of the isolating switches on the bus side, and ensures the safe and stable operation of the power grid.

[0046] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 A flow chart of a method for detecting a disconnector during hot-reverse operation of a substation provided by an embodiment of the present invention;

[0049] Figure 2 A schematic structural diagram of a circuit breaker bay combination provided by an embodiment of the present invention;

[0050] Figure 3 A flow chart of another method for detecting disconnectors during hot-flip operation of a substation provided by an embodiment of the present invention;

[0051] Figure 4 A flow chart of another method for detecting disconnectors during hot-flip operation of a substation provided by an embodiment of the present invention;

[0052] Figure 5 A flow chart of another method for detecting disconnectors during hot-flip operation of a substation provided by an embodiment of the present invention;

[0053] Figure 6 A flow chart of another method for detecting disconnectors during hot-flip operation of a substation provided by an embodiment of the present invention;

[0054] Figure 7 A flow chart of another method for detecting disconnectors during hot-flip operation of a substation provided by an embodiment of the present invention;

[0055] Figure 8 A flow chart of another method for detecting disconnectors during hot-flip operation of a substation provided by an embodiment of the present invention;

[0056] Fig. 9 A schematic structural diagram of a disconnector detection device during hot-reversal operation of a substation provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0058] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0059] Figure 1 A flow chart of a method for detecting a disconnector during hot-flip operation of a substation provided by an embodiment of the present invention. Figure 2The present invention provides a schematic diagram of the structure of a circuit breaker bay combination. This embodiment is applicable to the detection of disconnectors during hot-reverse operation of a substation. The method can be performed by a disconnector detection device during hot-reverse operation of a substation. The disconnector detection device during hot-reverse operation of a substation can be implemented in the form of hardware and / or software. The disconnector detection device during hot-reverse operation of a substation can be configured in a substation. Figure 2 As shown, the substation includes a plurality of circuit breaker bay combinations, the circuit breaker bay combinations at least including a busbar 101, a bus tie breaker 102 and a circuit breaker bay 103, the busbar 101 includes a first busbar 1011 and a second busbar 1012, the bus tie breaker 102 is electrically connected between the first busbar 1011 and the second busbar 1012, a plurality of circuit breaker bays 103 are mounted on the first busbar 1011 and the second busbar 1012, the circuit breaker bay 103 includes two busbar side disconnectors 104, the two busbar side disconnectors 104 are respectively mounted on the first busbar 1011 and the second busbar 1012. On a busbar 1011 and a second busbar 1012, one end of each circuit breaker bay 103 away from the busbar is connected to an electric device 105. For the same circuit breaker bay, when performing a hot busbar operation, when the two busbar-side disconnectors 104 are respectively the first disconnector 1041 and the second disconnector 1042, it is necessary to put the first disconnector 1041 and the second disconnector 1042 in a closed state, that is, in a closed state, and in a connected state with the electric device 105, so that the circuit breaker bay 103 is in an operating state. The circuit breaker bay 103 also includes a line-side disconnector, a circuit breaker, and a current transformer. When hot busbars are reversed, each phase of the busbar-side disconnector 104 needs to be in a closed state, thereby avoiding the occurrence of a large power outage caused by pulling the disconnector with load, and ensuring the safe and stable operation of the power grid. For example, when the first busbar 1011 is shut down for maintenance, all the circuit breaker bays 103 connected to the first busbar 1011 should be reversed to avoid the situation where the power-consuming equipment connected to the first busbar 1011 is disconnected due to the bus reverse operation. Usually, a hot reverse operation is used, that is, first close the second isolating switch 1042 on the second busbar 1012 side in the circuit breaker bay 103 connected to the first busbar 1011, then open the first isolating switch 1041 on the first busbar 1011 side, and finally disconnect the bus tie breaker 102. In this way, the circuit breaker bay that needs to be reversed is the hot reverse circuit breaker bay. Figure 2 The circuit breaker bays that are exemplarily shown to be electrically connected to the electrical equipment are thermally reversed mother circuit breaker bays. The method comprises:

[0060] S101, collecting the position status information of the busbar-side disconnecting switches of each circuit breaker interval in the hot-flip busbar.

[0061] Among them, the power dispatching includes the power dispatching main station, and the power dispatching main station includes the power dispatching main station automation system, which can collect the position status information of the bus side disconnectors in all circuit breaker intervals in the hot-reversing mother of the substation through remote signaling, that is, obtain the position status of the first disconnector and the second disconnector to determine whether the first disconnector and the second disconnector are both in the closed state. When the first disconnector and the second disconnector are both in the closed state, the mother circuit breaker is also in the closed state at the same time. At this time, the circuit will divert part of the current of the mother circuit breaker circuit, but the dispatching main station automation system can only make a preliminary judgment on the closing state of the first disconnector and the second disconnector. It is difficult to directly determine whether the closing of each phase of the disconnector in the hot-reversing mother circuit breaker interval is indeed in place. Therefore, it is necessary to judge the closing state of each phase of the bus side disconnector to avoid the situation where the disconnector is pulled with load during the hot-reversing mother operation, causing the bus to lose pressure.

[0062] S102, obtaining the current value of each phase of each circuit breaker interval in the thermally reversed busbar and the current value of each phase of the bus tie circuit breaker according to the position status information of the isolating switch on the busbar side.

[0063] Among them, according to the position status information of the busbar side disconnector, and based on the principle of Kirchhoff's current law, that is, the sum of the currents flowing into the node is equal to the sum of the currents flowing out of the node, the currents of each phase of all circuit breaker intervals connected to the bus and the current values ​​of each phase of the bus tie circuit breaker are obtained, that is, the three-phase currents passed through the busbar side disconnector and the bus tie circuit breaker are obtained, and the three-phase currents include phase A current, phase B current and phase C current.

[0064] S103, determining the closing state of each phase in the bus side disconnector according to the current value of each phase and the current value of each phase of the bus tie circuit breaker; or determining the closing state of each phase in the bus side disconnector according to the current value of each phase of the bus tie circuit breaker.

[0065] Among them, the change of the corresponding current during the closing process of the isolating switch is monitored in real time to judge the closing state of each phase of the isolating switch on the bus side, and the closing state of each phase of the isolating switch on the bus side is judged in combination with the current value of each phase of the bus tie circuit breaker. Alternatively, the closing state of each phase of the isolating switch on the bus side can be judged according to the change of the current value of each phase of the bus tie circuit breaker during the closing process of the isolating switch on the bus side.

[0066] The embodiment of the present invention provides a method for detecting isolating switches during hot-reversing bus operation of a substation, including: collecting the position status information of the isolating switches on the bus side in the hot-reversing bus circuit breaker interval; obtaining the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker connected to all the circuit breaker intervals of the bus according to the position status information of the isolating switches on the bus side; determining the closing status of each phase in the isolating switches on the bus side according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker; or determining the closing status of each phase in the isolating switches on the bus side according to the current values ​​of each phase of the bus tie circuit breaker. This solves the problem of the isolating switches not being closed properly during hot-reversing bus operation, realizes accurate judgment of the closing status of each phase of the isolating switches on the bus side, and ensures the safe and stable operation of the power grid.

[0067] Optional, Figure 3 A flowchart of another method for detecting a disconnector during hot-reversal operation of a substation provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the bus side disconnector position status information includes that there is a bus side disconnector in an open state and the bus side disconnectors are all in a closed state; the method includes:

[0068] S201, collecting the position status information of the busbar-side disconnecting switches of each circuit breaker interval in the hot-flip busbar.

[0069] S202, when there is a bus-side disconnecting switch in the open state, obtain the first phase current value of each circuit breaker interval and the first bus tie circuit breaker phase current value before the thermal collapse of the bus.

[0070] S203, when the isolating switches on the bus side are all in the closed state, obtain the second phase current values ​​of each circuit breaker interval in the thermally reversed bus and the second bus tie circuit breaker phase current values.

[0071] Among them, when it is necessary to collect the information that there is a bus-side disconnecting switch in the thermal-reversed mother circuit breaker interval that is in the open state, the first phase current value of each circuit breaker interval before the thermal-reversed mother and the current value of each phase of the first bus tie circuit breaker are obtained; when it is collected that the bus-side disconnecting switches in the thermal-reversed mother circuit breaker interval are all in the closed state, the second phase current value of each circuit breaker interval in the thermal-reversed mother and the current value of each phase of the second bus tie circuit breaker are obtained, so as to facilitate the comparison of the current values ​​before and after in the process of thermal-to-mother, combining the first phase current value, the second phase current value, the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker, so as to judge the closing state of each phase in the bus-side disconnecting switch.

[0072] S204, determining the closing state of each phase in the bus-side disconnector according to the first phase current value, the second phase current value, the phase current value of the first bus tie circuit breaker and the phase current value of the second bus tie circuit breaker; or, determining the closing state of each phase in the bus-side disconnector according to the phase current value of the first bus tie circuit breaker and the phase current value of the second bus tie circuit breaker.

[0073] The embodiment of the present invention provides a method for detecting isolating switches during hot-reversal operation of a substation, including: collecting position status information of bus-side isolating switches in hot-reversal bus circuit breaker intervals; when there is a bus-side isolating switch in the hot-reversal bus circuit breaker interval that is in an open state, obtaining the first phase current values ​​of each circuit breaker interval before the hot-reversal and the first bus tie circuit breaker current values; when all the bus-side isolating switches in the hot-reversal bus circuit breaker interval are in a closed state, obtaining the second phase current values ​​of each circuit breaker interval in the hot-reversal bus and the second bus tie circuit breaker current values; determining the closing state of each phase in the bus-side isolating switch according to the first phase current value, the second phase current value, the first bus tie circuit breaker current value, and the second bus tie circuit breaker current value; or determining the closing state of each phase in the bus-side isolating switch according to the first phase current value, the second phase current value, the first bus tie circuit breaker current value, and the second bus tie circuit breaker current value. In order to solve the problem of the busbar side disconnector not closing in place or poor contact during hot bus operation, it can realize accurate judgment of the closing status of each phase of the busbar side disconnector to ensure the safe and stable operation of the power grid.

[0074] Optional, Figure 4 A flowchart of another method for detecting a disconnector during hot-reversal operation of a substation provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the method includes:

[0075] S301, collecting the position status information of the bus-side disconnector in the hot-fall busbar circuit breaker interval.

[0076] S302, when there is a bus-side disconnecting switch in the open state, obtain the first phase current value of each circuit breaker interval and the first bus tie circuit breaker phase current value before the thermal collapse of the bus.

[0077] S303, when the isolating switches on the bus side are all in the closed state, obtain the second phase current values ​​of each circuit breaker interval in the thermally reversed bus and the second bus tie circuit breaker phase current values.

[0078] S304, obtaining first phase current difference values ​​of each circuit breaker interval before thermal bus failure according to the first phase current values ​​and the phase current values ​​of the first bus tie circuit breaker.

[0079] Among them, the current passed into the thermal mother circuit breaker interval is a three-phase current, including phase A, phase B and phase C. When there is a bus side disconnector in the thermal mother circuit breaker interval in the open state, the first phase current value and the first bus tie circuit breaker phase current value are respectively calculated for the corresponding phase to obtain the first phase current difference value. The first phase current value may include the first A phase current value, the first B phase current value and the first C phase current value, and the first bus tie circuit breaker phase current value may include the first bus tie circuit breaker A phase current value, the first bus tie circuit breaker B phase current value and the first bus tie circuit breaker C phase current value. Specifically, it is necessary to obtain the first A phase current value, the first B phase current value and the first C phase current value when there is a bus side disconnector in the open state, and at the same time obtain the first bus tie circuit breaker A phase current value, the first bus tie circuit breaker B phase current value and the first bus tie circuit breaker C phase current value of the bus tie circuit breaker when there is a bus side disconnector in the open state. At the same time, the first A-phase current differential value is obtained according to the first A-phase current value and the A-phase current value of the first busbar circuit breaker, the first B-phase current differential value is obtained according to the first B-phase current value and the B-phase current value of the first busbar circuit breaker, and the first C-phase current differential value is obtained according to the first C-phase current value and the C-phase current value of the first busbar circuit breaker.

[0080] S305, obtaining the second phase current difference value of the thermally reversed bus tie breaker interval according to the second phase current value and the second bus tie breaker phase current value.

[0081] Among them, when the bus-side disconnectors in the hot-reversed mother circuit breaker interval are all in the closed state, the second phase current values ​​and the corresponding phases in the phase current values ​​of the second mother-coupled circuit breakers are respectively calculated to obtain the second phase current difference values. Specifically, it is necessary to obtain the second A-phase current value, the second B-phase current value, and the second C-phase current value when the bus-side disconnectors are all in the closed state, and at the same time, obtain the second A-phase current value, the second B-phase current value, and the second C-phase current value of the mother-coupled circuit breaker when the disconnectors are all in the closed state. At the same time, the second A-phase current difference value is obtained according to the second A-phase current value and the A-phase current value of the second mother-coupled circuit breaker, the second B-phase current difference value is obtained according to the second B-phase current value and the B-phase current value of the second mother-coupled circuit breaker, and the second C-phase current difference value is obtained according to the second C-phase current value and the C-phase current value of the second mother-coupled circuit breaker.

[0082] S306, determining the closing state of each phase in the bus-side disconnector according to the first phase current difference value and the second phase current difference value.

[0083] Among them, during the closing operation of the bus-side disconnector, by comparing the current difference of each phase before and after the closing of the bus-side disconnector, it is judged whether each phase in the bus-side disconnector has a problem of inadequate closing or poor contact, so as to ensure the safe and stable operation of the power grid. Specifically, it is judged whether the A phase in the bus-side disconnector has a problem of inadequate closing or poor contact according to the first A phase current difference value and the second A phase current difference value; it is judged whether the B phase in the bus-side disconnector has a problem of inadequate closing or poor contact according to the first B phase current difference value and the second B phase current difference value; and it is judged whether the C phase in the bus-side disconnector has a problem of inadequate closing or poor contact according to the first C phase current difference value and the second C phase current difference value.

[0084] S307, determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker.

[0085] The embodiment of the present invention provides a method for detecting isolating switches during hot-reversal operation of a substation, including: collecting position status information of the bus-side isolating switches in the hot-reversal bus circuit breaker interval; when there is a bus-side isolating switch in the open state, obtaining the first phase current value of each circuit breaker interval before the hot-reversal and the first bus tie circuit breaker current value; when the bus-side isolating switches are all in the closed state, obtaining the second phase current value of each circuit breaker interval in the hot-reversal and the second bus tie circuit breaker current value; obtaining the first phase current difference value of the hot-reversal bus circuit breaker interval according to the first phase current value and the first bus tie circuit breaker current value; obtaining the second phase current difference value of the hot-reversal bus circuit breaker interval according to the second phase current value and the second bus tie circuit breaker current value; determining the closing state of each phase in the bus-side isolating switch according to the first phase current difference value and the second phase current difference value; or determining the closing state of each phase in the bus-side isolating switch according to the first phase current value and the second phase current value of the second bus tie circuit breaker. In order to solve the problem of the busbar side disconnector not closing in place or poor contact during hot bus operation, it can realize accurate judgment of the closing status of each phase of the busbar side disconnector to ensure the safe and stable operation of the power grid.

[0086] Optional, Figure 5 A flowchart of another method for detecting a disconnector during hot-reversal operation of a substation provided by an embodiment of the present invention is shown in FIG. Figure 5As shown, the first current value of each phase includes the first sub-phase current value of each circuit breaker interval before the thermal reverse bus hung on the first bus and the second sub-phase current value of each circuit breaker interval before the thermal reverse bus hung on the second bus; the first current difference value of each phase includes the first sub-phase current difference value and the second sub-phase current difference value; the second current value of each phase includes the third sub-phase current value of each circuit breaker interval in the thermal reverse bus hung on the first bus and the fourth sub-phase current value of each circuit breaker interval in the thermal reverse bus hung on the second bus; the second current difference value of each phase includes the third sub-phase current difference value and the fourth sub-phase current difference value; the method includes:

[0087] S401, collecting the position status information of the disconnector on the bus side of the thermally collapsed busbar circuit breaker interval.

[0088] S402, when there is a bus-side disconnecting switch in the open state, obtain the first sub-phase current value, the second sub-phase current value and the first bus tie circuit breaker current value of each phase of each circuit breaker interval before the thermal collapse of the bus.

[0089] S403, when the isolating switches on the bus side are all in the closed state, obtain the third sub-phase current value, the fourth sub-phase current value and the second bus tie circuit breaker phase current value of each circuit breaker interval in the thermal reverse bus.

[0090] S404, obtaining first sub-phase current difference values ​​of each circuit breaker interval on the first bus before thermal collapse according to the first sub-phase current values ​​and the first bus tie circuit breaker phase current values.

[0091] Among them, according to the first sub-phase current value and the first bus tie circuit breaker current value when there is a bus side disconnector in the open state, the first sub-phase current value and the first bus tie circuit breaker current value corresponding to each phase are added, and the first sub-phase current difference value of each circuit breaker interval on the first bus before the thermal collapse is obtained. The first sub-phase current value may include the first sub-A phase current value I 分IA , the first sub-phase B current value I 分IB and the first sub-phase C current value I 分IC , the current values ​​of each phase of the first bus tie circuit breaker may include the current value of the A phase of the first bus tie circuit breaker I 分MLA 、The current value of phase B of the first busbar circuit breaker I 分MLB and the first busbar circuit breaker C phase current value I 分MLC The first sub-phase current difference value may include the first sub-phase A current difference value I IA分差流 , the first sub-phase B current difference value I IB分差流 and the first sub-phase C current difference value I IC分差流 , I IA分差流 =I 分IA +I 分MLA ,I IB分差流 =I分IB +I 分MLB and I IC分差流 =I 分IC +I 分MLC .

[0092] S405, obtaining the second sub-phase current difference value of each circuit breaker interval on the second bus before the thermal collapse according to the second sub-phase current value and the first bus tie circuit breaker phase current value.

[0093] Among them, according to the second sub-phase current value and the first bus tie circuit breaker current value when there is a bus side disconnecting switch in the open state, the corresponding phases in the second sub-phase current value and the first bus tie circuit breaker current value are added to obtain the second sub-phase current difference value of each circuit breaker interval on the second bus before the thermal collapse, and the second sub-phase current value may include the second sub-A phase current value I 分IIA , the second sub-phase B current value I 分IIB and the second sub-phase C current value I 分IIC , the current values ​​of each phase in the first bus tie circuit breaker may include the current value of the A phase of the first bus tie circuit breaker I 分MLA 、The current value of phase B of the first busbar circuit breaker I 分MLB and the first busbar circuit breaker C phase current value I 分MLC The second sub-phase current difference value may include the second sub-phase A current difference value I IIA分差流 , the second sub-phase B current difference value I IIB分差流 and the second sub-phase C current difference value I IIC分差流 , I IIA分差流 =I 分IIA +I 分MLA ,I IIB分差流 =I 分IIB +I 分MLB and I IIC开差流 =I 分IIC +I 分MLC .

[0094] S406, obtaining the third sub-phase current difference value of each circuit breaker interval on the first bus in the thermal-reversed bus according to the third sub-phase current value and the second bus tie circuit breaker phase current value.

[0095] Among them, according to the third sub-phase current value and the second bus tie circuit breaker current value when the bus side disconnectors are all in the closed state, the corresponding phases in the third sub-phase current value and the second bus tie circuit breaker current value are added, and the second sub-phase current difference value of each circuit breaker interval on the first bus in the hot reverse bus is obtained. The third sub-phase current value may include the third sub-A phase current value I 合IA , the third sub-phase B current value I 合IB and the third sub-phase C current value I 合IC, the current values ​​of each phase in the second bus tie circuit breaker may include the current value of phase A in the second bus tie circuit breaker I 合MLA , the B-phase current value I in the second bus tie circuit breaker 合MLB and the C phase current value I in the second bus tie circuit breaker 合MLC The third sub-phase current difference value may include the third sub-phase A current difference value I IA合差流 , the third sub-phase B current difference value I IB合差流 and the third phase C current difference value I IC合差流 , I IA合差流 =I 合IA +I 合MLA ,I IB合差流 =I 合IB +I 合MLB and I IC合差流 =I 合IC +I 合MLC .

[0096] S407, obtaining the fourth sub-phase current difference value of each circuit breaker interval on the second busbar according to the fourth sub-phase current value and the second bus tie circuit breaker current value.

[0097] Among them, according to the fourth sub-phase current value and the second bus tie circuit breaker current value when the bus side disconnectors are all in the closed state, the fourth sub-phase current value and the second bus tie circuit breaker current value are added to the corresponding phases, and the fourth sub-phase current difference value of each circuit breaker interval on the second bus is obtained. The fourth sub-phase current value may include the fourth sub-A phase current value I 合IIA , the fourth sub-phase B current value I 合IIB and the fourth sub-phase C current value I 合IIC , the current values ​​of each phase in the second bus tie circuit breaker may include the current value of phase A in the second bus tie circuit breaker I 合MLA , the B-phase current value I in the second bus tie circuit breaker 合MLB and the C phase current value I in the second bus tie circuit breaker 合MLC , the fourth sub-phase current difference value may include the fourth sub-A phase current difference value I IIA合差流 , the fourth sub-phase B current difference value I IIB合差流 and the fourth sub-phase C current difference value I IIC合差流 , I IIA合差流 =I 合IIA +I 合MLA ,I IIB合差流 =I 合IIB +I 合MLB and I IIC合差流 =I 合IIC +I 合MLC .

[0098] S408, determining the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value and the third sub-phase current difference value.

[0099] Among them, there is a first sub-phase current difference value when the bus side disconnector is in the open state and a third sub-phase current difference value when the bus side disconnector is in the closed state, and the closing state of each phase in the bus side disconnector is determined. That is, according to the first sub-phase A current difference value I IA分差流 and the third phase A current difference value I IA合差流 Determine the closing state of phase A in the busbar side disconnector; according to the first sub-phase B current difference value I IB分差流 and the third phase B current difference value I IB合差流 Determine the B-phase closing state of the busbar side disconnector and the current difference value I of the first sub-phase C IC分差流 and the third phase C current difference value I IC合差流 Determine the closing status of phase C in the busbar side disconnector.

[0100] S409, determining the closing state of each phase in the bus-side disconnector according to the second sub-phase current difference value and the fourth sub-phase current difference value.

[0101] Among them, there is a second sub-phase current difference value when the bus side disconnector is in the open state and a fourth sub-phase current difference value when the bus side disconnector is in the closed state, and the closing state of each phase in the bus side disconnector is determined. That is, according to the second sub-phase A current difference value I IIA分差流 and the fourth phase A current difference value I IIA合差流 Determine the closing state of phase A in the busbar side disconnector; according to the second sub-phase B current difference value I IIB分差流 and the fourth phase B current difference value I IIB合差流 Determine the closing state of phase B in the busbar side disconnector; according to the second sub-phase C current difference value I IIC分差流 and the fourth sub-phase C current difference value I IIC合差流 Determine the closing status of phase C in the busbar side disconnector.

[0102] S410, determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker.

[0103] The embodiment of the present invention obtains the first sub-phase current difference value of each circuit breaker interval on the first bus before thermal bus failure according to the first sub-phase current value and the first bus-tie circuit breaker current value; obtains the second sub-phase current difference value of each circuit breaker interval on the second bus before thermal bus failure according to the second sub-phase current value and the first bus-tie circuit breaker current value; obtains the third sub-phase current difference value of each circuit breaker interval on the first bus in the thermal bus failure according to the third sub-phase current value and the second bus-tie circuit breaker current value; obtains the fourth sub-phase current difference value of each circuit breaker interval on the second bus in the thermal bus failure according to the fourth sub-phase current value and the second bus-tie circuit breaker current value; determines the closing state of each phase in the disconnector according to the first sub-phase current difference value and the third sub-phase current difference value; determines the closing state of each phase in the bus-side disconnector according to the second sub-phase current difference value and the fourth sub-phase current difference value. In order to solve the problem of the busbar side disconnector not closing properly during hot bus reversal operation, accurate judgment of the closing status of each phase of the busbar side disconnector can be achieved to ensure the safe and stable operation of the power grid.

[0104] Optional, Figure 6 A flowchart of another method for detecting a disconnector during hot-reversal operation of a substation provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the method includes:

[0105] S501, collecting the position status information of the bus-side disconnector in the hot-fall busbar circuit breaker interval.

[0106] S502, when there is a bus-side disconnecting switch in the open state, obtain the first sub-phase current value, the second sub-phase current value and the first bus tie circuit breaker current value of each phase of each circuit breaker interval before thermal collapse.

[0107] S503, when the busbar-side disconnectors are all in the closed state, obtain the third sub-phase current value, the fourth sub-phase current value and the second busbar tie circuit breaker phase current value of each circuit breaker interval in the thermal reverse busbar.

[0108] S504, obtaining first sub-phase current difference values ​​of each circuit breaker interval on the first bus before thermal collapse according to the first sub-phase current values ​​and the first bus tie circuit breaker phase current values.

[0109] S505, obtaining the second sub-phase current difference value of each circuit breaker interval on the second bus before the thermal collapse according to the second sub-phase current value and the first bus tie circuit breaker phase current value.

[0110] S506, obtaining the third sub-phase current difference value of each circuit breaker interval on the first bus in the thermal-reversed bus according to the third sub-phase current value and the second bus tie circuit breaker phase current value.

[0111] S507, obtaining the fourth sub-phase current difference value of each circuit breaker interval on the second busbar according to the fourth sub-phase current value and the second bus tie circuit breaker current value.

[0112] S508, obtaining a first preset phase difference flow ratio value corresponding to the first bus and a second preset phase difference flow ratio value corresponding to the second bus.

[0113] Among them, the first preset phase differential flow ratio and the second preset phase differential flow ratio can be set according to the operating experience value of the substation, and can be selected according to the actual design requirements, and the embodiment of the present invention does not make specific limitations. Exemplarily, the first preset phase differential flow ratio can be 0.1, and the second preset phase differential flow ratio can be 0.1.

[0114] S509, determining the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value, the third sub-phase current difference value and the first preset phase current difference ratio.

[0115] For example, when there is an isolating switch in the open state on the bus side of the thermally reversed bus breaker, the I IA分差流 =1A,I IB分差流 =1A,I IC分差流 =1A; When the thermal busbar disconnectors are all in the closed state, the I IA合差流 =1A,I IB合差流 =10A, I IC合差流 =10A; then |I IA合差流 -I IA分差流 | / |I IA分差流 |=0,|I IB合差流 -I IB分差流 | / |I IB分差流 |=9,|I IC合差流 -I IC分差流 | / |I IC分差流 |=9;When the difference current value of the first phase current and the difference current value of the third phase current are less than the first preset phase difference current ratio, phase A does not participate in the current diversion, and it is considered that the A phase of the busbar side disconnector is not closed properly or has poor contact. The above method can be used to infer the situation that the B phase or the C phase is not closed properly or has poor contact.

[0116] S510, determining the closing state of each phase in the bus-side disconnector according to the second sub-phase current difference value, the fourth sub-phase current difference value and the second preset phase current difference ratio.

[0117] For example, when one of the isolating switches on the busbar side of the thermally reversed bus breaker is in the open state, the I IIA分差流 =-1A, I IIB分差流 =-1A, IIIC分差流 =-1A; When the disconnectors on the busbar side of the thermally reversed busbar circuit breaker are all in the closed state, the I IIA合差流 =-1A, I IIB合差流 =-10A, I IIC合差流 =-10A; then, |I IIA合差流 I IA分差流 | / |I IIA分差流 |=0,|I IIB合差流 -I IB分差流 | / |I IIB分差流 |=9,|I IIC合差流- I IIC分差流 | / |I IIC分差流 |=9;When the difference current value of the second phase current and the difference current value of the fourth phase current are less than the second preset phase difference ratio, phase A does not participate in the current splitting, and it is considered that the A phase of the busbar side disconnector is not closed properly or has poor contact. The above method can be used to infer the situation that the B phase or the C phase is not closed properly or has poor contact.

[0118] S511, determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker.

[0119] The embodiment of the present invention obtains the first preset differential current ratio of each phase corresponding to the first bus and the second preset differential current ratio of each phase corresponding to the second bus; determines the closing state of each phase in the bus side disconnector according to the first sub-phase current differential current value, the third sub-phase current differential current value and the first preset differential current ratio; determines the closing state of each phase in the bus side disconnector according to the second sub-phase current differential current value, the fourth sub-phase current differential current value and the second preset differential current ratio. This solves the problem of the bus side disconnector not closing in place during the hot bus operation, realizes the accurate judgment of the closing state of each phase of the bus side disconnector, and ensures the safe and stable operation of the power grid.

[0120] Optional, Figure 7 A flowchart of another method for detecting a disconnector during hot-reversal operation of a substation provided by an embodiment of the present invention is shown in FIG. Figure 7 As shown, the method includes:

[0121] S601, collecting the position status information of the bus-side disconnector in the hot-fall busbar circuit breaker interval.

[0122] S602, when there is a bus-side disconnecting switch in the open state, obtain the first sub-phase current value, the second sub-phase current value and the first bus tie circuit breaker phase current value of each circuit breaker interval before the thermal collapse of the bus.

[0123] S603, when all the isolating switches on the bus side are in the closed state, obtain the third sub-phase current value, the fourth sub-phase current value and the second bus tie circuit breaker phase current value of each circuit breaker interval in the thermal reverse bus.

[0124] S604, obtaining first sub-phase current difference values ​​of each circuit breaker interval on the first bus before thermal collapse according to the first sub-phase current values ​​and the first bus tie circuit breaker phase current values.

[0125] S605, obtaining the second sub-phase current difference value of each circuit breaker interval on the second bus before the thermal collapse according to the second sub-phase current value and the first bus tie circuit breaker current value.

[0126] S606, obtaining the third sub-phase current difference value of each circuit breaker interval on the first bus in the thermal-reversed bus according to the third sub-phase current value and the second bus tie circuit breaker phase current value.

[0127] S607, obtaining the fourth sub-phase current difference value of each circuit breaker interval on the second busbar according to the fourth sub-phase current value and the second busbar current value.

[0128] S608, obtaining a first preset phase difference flow ratio value corresponding to the first bus and a second preset phase difference flow ratio value corresponding to the second bus.

[0129] S609, determining the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value, the third sub-phase current difference value and the first preset phase current difference ratio.

[0130] S610, determining the closing state of each phase in the bus-side disconnector according to the second sub-phase current difference value, the fourth sub-phase current difference value and the second preset phase current difference ratio.

[0131] S611, obtaining a third preset phase current difference ratio corresponding to the bus tie circuit breaker.

[0132] The third preset phase differential current ratio value can be set according to the operating experience of the substation, and can be selected according to actual design requirements, and is not specifically limited in the embodiment of the present invention. For example, the third preset phase differential current ratio value can be 0.33.

[0133] S612, determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the first bus tie circuit breaker, the current value of each phase of the second bus tie circuit breaker and a third preset current difference ratio of each phase.

[0134] For example, when there is an isolating switch in the open state on the busbar side of the thermally reversed bus breaker, the I of the first bus tie breaker 分MLA =100A, I 分MLB =105A, I 分MLC=99A; When the disconnectors on the busbar side of the thermal bus breaker are all in the closed state, the I 合MLA =100A, I 合MLB =50A, I 合MLC =50A; then, |I 合MLA -I 分MLA | / |I 分MLA |=0,|I 合MLB -I 分MLB | / |I 分MLB |=0.52,|I 合MLC -I 分MLC | / |I 分MLC |=0.49;When the current value of each phase of the first bus tie circuit breaker is less than the current value of each phase of the second bus tie circuit breaker, the current difference value of the third sub-phase A or the current difference value of the fourth sub-phase A is close to 0A, and the current difference of other phases is large, it is considered that the A phase of the bus side disconnector is not closed in place. The above method is also used for B phase or C phase, and the situation of incomplete closing or poor contact is obtained.

[0135] The embodiment of the present invention obtains the third preset phase differential current ratio corresponding to the bus tie circuit breaker; determines the closing state of each phase in the bus side disconnector according to the current value of each phase of the first bus tie circuit breaker, the current value of each phase of the second bus tie circuit breaker and the third preset phase differential current ratio, so as to solve the problem of the disconnector not being closed properly during the hot bus reverse operation, realize the accurate judgment of the closing state of each phase of the bus side disconnector, and ensure the safe and stable operation of the power grid.

[0136] Optional, Figure 8 A flowchart of another method for detecting a disconnector during hot-reversal operation of a substation provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the method includes:

[0137] S701, collecting the position status information of the bus-side disconnector in the hot-fall busbar circuit breaker interval.

[0138] S702, according to the position status information of the isolating switch on the bus side, obtain the current value of each phase of each circuit breaker interval in the thermally reversed bus and the current value of each phase of the bus tie circuit breaker.

[0139] S703, determining the closing state of each phase in the bus side disconnector according to the current value of each phase and the current value of each phase of the bus tie circuit breaker; or, determining the closing state of each phase in the bus side disconnector according to the current value of each phase of the bus tie circuit breaker.

[0140] S704: When it is determined that at least one phase of the disconnector on the bus side is in a state of not being opened properly or having poor contact, an alarm signal is output.

[0141] Among them, when the power dispatching master station automation system determines that a phase of the busbar side disconnector is not closed properly or has poor contact in the closed state, that is, it is in an open state or has poor contact, then the power dispatching master station automation system will output an alarm signal. The alarm signal may include an alarm window, voice notification, SMS notification, buzzer notification, etc., to remind the on-duty dispatcher that a phase of the busbar side disconnector in the hot-reversed mother circuit breaker interval is not closed properly or has poor contact. At the same time, after the alarm signal is issued, the power dispatching master station automation system will suspend the hot-reversed mother programmed operation to facilitate subsequent troubleshooting and ensure the safe operation of the power grid.

[0142] The embodiment of the present invention determines the closing state of each phase in the bus-side disconnector according to the current value of each phase and the current value of each phase of the bus tie circuit breaker; or, after determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the bus tie circuit breaker, it is determined that at least one phase of the bus-side disconnector is in a state of not being opened properly or having poor contact, and outputs an alarm signal to remind the dispatcher to conduct timely fault troubleshooting to ensure the safe and stable operation of the power grid.

[0143] Fig. 9 A schematic diagram of the structure of a disconnector detection device for a substation hot-flip mother operation provided by an embodiment of the present invention, wherein the disconnector detection device for a substation hot-flip mother operation comprises a disconnector detection method for a substation hot-flip mother operation as described in any one of the above embodiments. The disconnector detection device for a substation hot-flip mother operation comprises:

[0144] The bus side disconnector position status information acquisition module 201 is used to acquire the bus side disconnector position status information of the hot-fall bus circuit breaker interval;

[0145] The module 202 for acquiring the current value of each phase is used to acquire the current value of each phase of each circuit breaker interval and the current value of each phase of the bus tie circuit breaker when the bus is thermally reversed according to the position status information of the isolating switch on the bus side;

[0146] The bus side disconnector phase closing state determination module 203 is used to determine the closing state of each phase in the bus side disconnector according to the current value of each phase and the current value of each phase of the bus tie circuit breaker; or, determine the closing state of each phase in the bus side disconnector according to the current value of each phase of the bus tie circuit breaker.

[0147] It should be noted that since the isolating switch detection device for the substation hot-flip operation provided in this embodiment includes the isolating switch detection method for the substation hot-flip operation as described in any of the embodiments of the present invention, it has the same or corresponding beneficial effects as the isolating switch detection method for the substation hot-flip operation, which will not be elaborated here.

[0148] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting disconnectors during hot bus-reversal operation of a substation, applied to a disconnector detection device during hot bus-reversal operation of a substation, wherein the substation comprises a circuit breaker bay combination, wherein the circuit breaker bay combination comprises at least a busbar, a bus tie circuit breaker and a plurality of circuit breaker bays, wherein the busbar comprises a first busbar and a second busbar, wherein the bus tie circuit breaker is electrically connected between the first busbar and the second busbar, wherein a plurality of circuit breaker bays are mounted on the first busbar and the second busbar, wherein the circuit breaker bay comprises two busbar-side disconnectors, wherein the two busbar-side disconnectors are respectively mounted on the first busbar and the second busbar, wherein: The disconnector detection method during the hot-reverse operation of the transformer substation includes: Collect the position status information of the busbar-side disconnector of each circuit breaker interval in the hot-reverse busbar; According to the position status information of the isolating switch on the bus side, the current values ​​of each phase of each circuit breaker interval and the current values ​​of each phase of the bus tie circuit breaker are obtained when the bus is thermally reversed; The closing state of each phase in the bus side disconnector is determined according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker; or, the closing state of each phase in the bus side disconnector is determined according to the current values ​​of each phase of the bus tie circuit breaker.

2. The method for detecting disconnectors during hot-reversal operation of a substation according to claim 1, characterized in that: The bus-side disconnector position status information includes whether one of the bus-side disconnectors is in an open state and whether all of the bus-side disconnectors are in a closed state; According to the position status information of the busbar side disconnector, the current values ​​of each phase of each circuit breaker interval and the current values ​​of each phase of the bus tie circuit breaker are obtained, including: When there is a busbar-side disconnecting switch in an open state, obtaining the first phase current value of each circuit breaker interval and the first bus tie circuit breaker current value before the thermal bus failure; When the busbar-side disconnectors are all in a closed state, the second phase current values ​​of each circuit breaker interval in the thermally reversed busbar and the second busbar tie circuit breaker phase current values ​​are obtained.

3. The method for detecting disconnectors during hot-reversal operation of a substation according to claim 2, characterized in that: Determining the closing state of each phase in the bus-side disconnector according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker includes: Obtaining first phase current difference values ​​of each of the circuit breaker intervals before thermal bus failure according to the first phase current values ​​and the first bus tie circuit breaker phase current values; Obtaining second phase current difference values ​​of each of the circuit breaker intervals in the thermal reverse bus according to the second phase current values ​​and the second bus tie circuit breaker phase current values; The closing state of each phase in the bus-side disconnector is determined according to the first phase current difference value and the second phase current difference value.

4. The method for detecting disconnectors during hot-reversal operation of a substation according to claim 3, characterized in that: The first current values ​​of each phase include the first sub-phase current values ​​of each circuit breaker interval before the thermal reverse bus hung on the first bus and the second sub-phase current values ​​of each circuit breaker interval equipment before the thermal reverse bus hung on the second bus; the first current difference value of each phase includes the first sub-phase current difference value and the second sub-phase current difference value; the second current value of each phase includes the third sub-phase current value of each circuit breaker interval in the thermal reverse bus hung on the first bus and the fourth sub-phase current value of each circuit breaker interval in the thermal reverse bus hung on the second bus; the second current difference value of each phase includes the third sub-phase current difference value and the fourth sub-phase current difference value; Obtaining first phase current difference values ​​of each of the circuit breaker intervals before thermal bus failure according to the first phase current values ​​and the first bus tie circuit breaker phase current values, including: Obtaining the first sub-phase current difference value of each of the circuit breakers on the first bus before thermal collapse according to the first sub-phase current value and the first bus tie circuit breaker current value; Obtain the second sub-phase current difference value of each of the circuit breakers on the second bus before thermal collapse according to the second sub-phase current value and the first bus tie circuit breaker phase current value; The method of obtaining the second phase current difference value of each of the circuit breaker intervals in the thermal reverse bus according to the second phase current value and the second bus tie circuit breaker phase current value comprises: Obtain the third sub-phase current difference value of each of the circuit breakers in the thermal busbar on the first busbar according to the third sub-phase current value and the second busbar current value; Obtain the fourth sub-phase current difference value of each of the circuit breakers in the thermal busbar on the second busbar according to the fourth sub-phase current value and the second busbar current value; Determining the closing state of each phase in the bus-side disconnector according to the first phase current difference value and the second phase current difference value includes: Determine the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value and the third sub-phase current difference value; The closing state of each phase in the bus-side disconnector is determined according to the second sub-phase current difference value and the fourth sub-phase current difference value.

5. The method for detecting disconnectors during hot-reversal operation of a transformer substation according to claim 4, characterized in that: Before determining the closing state of each phase in the bus-side disconnector according to the first phase current difference value and the second phase current difference value, the method further includes: Obtaining a first preset phase differential current ratio value corresponding to the first bus and a second preset phase differential current ratio value corresponding to the second bus; Determining the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value and the third sub-phase current difference value includes: Determine the closing state of each phase in the bus-side disconnector according to the first sub-phase current difference value, the third sub-phase current difference value and the first preset phase current difference ratio; Determining the closing state of each phase in the bus-side disconnector according to the second sub-phase current difference value and the fourth sub-phase current difference value includes: The closing state of each phase in the bus-side disconnector is determined according to the second sub-phase current difference value, the fourth sub-phase current difference value and the second preset phase current difference ratio.

6. The method for detecting disconnectors during hot-reversal operation of a substation according to claim 2, characterized in that: After determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the bus tie circuit breaker, the method further includes: The closing state of each phase in the bus-side disconnector is determined according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker.

7. The method for detecting disconnectors during hot-reversal operation of a transformer substation according to claim 1, characterized in that: Before determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker, the method further includes: Obtaining a third preset phase differential current ratio corresponding to the bus tie circuit breaker; Determining the closing state of each phase in the bus-side disconnector according to the current value of each phase of the first bus tie circuit breaker and the current value of each phase of the second bus tie circuit breaker includes: The closing state of each phase in the bus-side disconnector is determined according to the current value of each phase of the first bus tie circuit breaker, the current value of each phase of the second bus tie circuit breaker and the third preset phase difference current ratio value.

8. The method for detecting disconnectors during hot-reversal operation of a transformer substation according to claim 1, characterized in that: Determining the closing state of each phase in the bus-side disconnector according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker; or, after determining the closing state of each phase in the bus-side disconnector according to the current values ​​of each phase of the bus tie circuit breaker, further comprising: When it is determined that at least one phase of the busbar-side disconnector is in a state of incomplete closing or poor contact, an alarm signal is output.

9. A disconnector detection device for hot-reversal operation of a substation, characterized in that: The invention comprises the disconnector detection method during hot-reversal operation of a substation as described in any one of claims 1 to 8.

10. The isolating switch detection device during hot-reversal operation of a substation according to claim 9, characterized in that: The isolating switch detection device during the hot-reversal operation of the substation comprises: The busbar side disconnector position status information collection module is used to collect the busbar side disconnector position status information of each circuit breaker interval in the hot-flip busbar; A module for acquiring current values ​​of each phase, used for acquiring current values ​​of each phase of each circuit breaker interval and current values ​​of each phase of the bus tie circuit breaker during hot-flip bus according to the position status information of the isolating switch; A module for determining the closing status of each phase of the bus-side disconnector is used to determine the closing status of each phase in the bus-side disconnector according to the current values ​​of each phase and the current values ​​of each phase of the bus tie circuit breaker; or, to determine the closing status of each phase in the bus-side disconnector according to the current values ​​of each phase of the bus tie circuit breaker.

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