High-voltage switch cabinet, interlocking loop, and high-voltage switch cabinet control method and interlocking loop control method under new energy power system

Abstract

The invention discloses a high-voltage switch cabinet, an interlocking loop, and a high-voltage switch cabinet control method and an interlocking loop control method under a new energy power system, and relates to the technical field of energy. The high-voltage switch cabinet comprises a cabinet body; the high-voltage switch is mounted on the cabinet body and comprises a grounding switch, an isolating switch, a high-voltage circuit breaker and a first interlocking structure; the grounding switch, the isolating switch and the high-voltage circuit breaker are respectively connected with the first interlocking structure; wherein the first interlocking structure is matched with the cabinet body, and is used for firstly opening the grounding switch, then closing the isolating switch and then closing the high-voltage circuit breaker during closing, or firstly opening the high-voltage circuit breaker, then opening the isolating switch and then closing the grounding switch during opening. According to the embodiment of the invention, the method can achieve the miniaturization of the high-voltage switch cabinet.

Description

Technical Field

[0001] The present application belongs to the field of energy technology, and specifically relates to a high-voltage switch cabinet, an interlocking circuit, a high-voltage switch cabinet control method and an interlocking circuit control method in a new energy power system. Background Art

[0002] Traditional high-voltage switchgear is mostly used in power distribution or power generation lines, where only one end (incoming line end) is energized, and the other end (outgoing line end) needs to be energized by closing the switch. However, the switchgear in the new energy industry is energized at both ends, with the electric energy at one end being the electricity converted from new energy, and the electric energy at the other end being the electricity from the grid. Therefore, traditional high-voltage switchgear cannot be used in power transmission in the new energy industry.

[0003] The new energy industry is located in harsh outdoor environments with high winds and long sunshine. Some of the substations are built on the sea, mudflats or mountains. There are many inconveniences in building civil substations, and they are often prefabricated in factories. This requires the high-voltage switchgear used to be small in size.

[0004] The high-voltage switchgear in the new energy industry in the prior art includes a cabinet body, in which are arranged isolating switches, vacuum switches, current transformers, grounding switches, a first crank arm connecting rod group, a second crank arm connecting rod group, a transmission sprocket group, a safety partition, etc. Although the first crank arm connecting rod group can be structurally arranged according to the internal space of the cabinet body, the volume of the high-voltage switchgear can be reduced to a certain extent, but after all, the volume reduction of the high-voltage switchgear is limited. Therefore, how to achieve the miniaturization of the high-voltage switchgear is a problem that needs to be solved urgently. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a high-voltage switch cabinet, an interlocking circuit, a high-voltage switch cabinet control method and an interlocking circuit control method in a new energy power system in view of the above-mentioned deficiencies in the prior art. By using the high-voltage switch cabinet, the miniaturization of the high-voltage switch cabinet can be achieved.

[0006] In a first aspect, an embodiment of the present application provides a high-voltage switch cabinet, comprising:

[0007] Cabinet;

[0008] A high-voltage switch, installed on the cabinet, comprises a grounding switch, a disconnecting switch, a high-voltage circuit breaker and a first interlocking structure; the grounding switch, the disconnecting switch and the high-voltage circuit breaker are respectively connected to the first interlocking structure;

[0009] Among them, the first interlocking structure and the cabinet cooperate with each other to first open the grounding switch, then close the isolating switch, and then close the high-voltage circuit breaker when closing the switch, or, when opening the switch, first open the high-voltage circuit breaker, then open the isolating switch, and then close the grounding switch.

[0010] In some embodiments of the first aspect, the cabinet includes:

[0011] Channel steel column, high voltage switch is installed on the channel steel column;

[0012] The switch panel is installed on the interlocking main board of the first interlocking structure and is provided with a first grounding switch operating hole and a first isolating switch operating hole.

[0013] In some embodiments of the first aspect, the first interlocking structure includes:

[0014] Interlocking main board;

[0015] A movable lock plate is arranged on the interlocking main board, and a second grounding switch operating hole and a second isolating switch operating hole are arranged on the movable lock plate;

[0016] A pull pin is arranged on the interlocking main board and connected to the movable lock plate, and is used to cooperate with the movable lock plate to control the alignment or non-alignment of the first grounding switch operating hole with the second grounding switch operating hole, and / or to control the alignment or non-alignment of the first isolating switch operating hole with the second isolating switch operating hole;

[0017] The grounding switch operating shaft is arranged on the interlocking main board and connected to the grounding switch, and is used to close or open the grounding switch when the first grounding switch operating hole is aligned with the second grounding switch operating hole;

[0018] The isolating switch operating shaft is arranged on the interlocking main board and connected to the isolating switch, and is used to close or open the isolating switch when the first isolating switch operating hole and the second isolating switch operating hole are aligned;

[0019] A high-voltage circuit breaker control component is arranged on the interlock main board and connected to the high-voltage circuit breaker. It is used to close or open the high-voltage circuit breaker when the first grounding switch operating hole and the second grounding switch operating hole are not aligned, and the first isolating switch operating hole and the second isolating switch operating hole are not aligned.

[0020] In some embodiments of the first aspect, the grounding switch operating shaft includes a first body and a first crank arm.

[0021] The first main body and the first crank arm are connected by a first connecting rod;

[0022] Under the control of the operating handle, the first body drives the first crank arm to rotate through the first connecting rod, thereby driving the grounding switch to rotate, so as to close or open the grounding switch;

[0023] and / or,

[0024] The isolating switch operating shaft comprises a second main body and a second crank arm.

[0025] The second main body and the second crank arm are connected by a second connecting rod;

[0026] Under the control of the operating handle, the second body drives the second crank arm to rotate through the second connecting rod, thereby driving the disconnector to rotate to close or open the disconnector;

[0027] and / or,

[0028] The high-voltage circuit breaker control assembly includes an energy storage hole, an energy storage mechanism, a first closing button and an opening button.

[0029] The energy storage hole, the first closing button and the opening button are respectively connected to the energy storage mechanism. The energy storage hole is used to control the energy storage mechanism to store energy. The first closing button is used to control the energy storage mechanism to be connected to the high-voltage circuit breaker to close the high-voltage circuit breaker. The opening button is used to control the energy storage mechanism not to be connected to the high-voltage circuit breaker to open the high-voltage circuit breaker.

[0030] In some embodiments of the first aspect, when the pull pin is located at the first position, the pull pin cooperates with the movable lock plate to control the first grounding switch operating hole to align with the second grounding switch operating hole;

[0031] Alternatively, when the pull pin is located at the second position, the pull pin cooperates with the movable lock plate to control the first isolating switch operating hole to align with the second isolating switch operating hole;

[0032] Alternatively, when the pull pin is located at the third position, the pull pin cooperates with the movable locking plate to control the misalignment of the first grounding switch operating hole and the second grounding switch operating hole, and the misalignment of the first isolating switch operating hole and the second isolating switch operating hole.

[0033] In some embodiments of the first aspect, an electromagnetic lock is provided on the switch panel, and the electromagnetic lock is used to lock the operating shaft of the grounding switch to prevent the operation of the grounding switch;

[0034] Three sides of the cabinet are open;

[0035] And / or, the high-voltage switch further includes a first sensor, and the first sensor is used to detect whether the incoming line side of the high-voltage switch cabinet is energized.

[0036] Based on the same inventive concept, in a second aspect, the embodiment of the present application further provides an interlocking circuit, comprising:

[0037] The high voltage switchgear of the first aspect;

[0038] Among them, the first sensor of the high-voltage switch is used to detect whether the incoming line side of the high-voltage switch cabinet is energized; an electromagnetic lock is provided on the switch panel of the cabinet;

[0039] The display is provided with a display contact, which is electrically connected to the first sensor and the electromagnetic lock, and is used to close when the first sensor detects that the incoming line side of the high-voltage switch cabinet is energized, so that the electromagnetic lock locks the grounding switch operating shaft of the first interlocking structure, thereby blocking the operation of the grounding switch.

[0040] In some embodiments of the second aspect, the grounding switch is provided with an auxiliary normally closed contact, which is used to close when the grounding switch is opened, or to open when the grounding switch is closed;

[0041] The interlocking circuit also includes:

[0042] The low-voltage switch cabinet comprises a low-voltage circuit breaker and a second closing button. The low-voltage circuit breaker comprises a closing coil. An auxiliary normally closed contact is connected between the second closing button and the closing coil. The second closing button is used to control the closing of the low-voltage circuit breaker when the auxiliary normally closed contact is closed.

[0043] Based on the same inventive concept, in a third aspect, the embodiment of the present application further provides a high-voltage switch cabinet control method in a new energy power system, which is applied to the high-voltage switch cabinet in the first aspect;

[0044] Methods include:

[0045] By controlling the first interlocking structure and the cabinet to cooperate with each other, it is achieved that when closing the circuit, the earthing switch is first opened, then the isolating switch is closed, and then the high-voltage circuit breaker is closed; or, when opening the circuit, the high-voltage circuit breaker is first opened, then the isolating switch is opened, and then the earthing switch is closed.

[0046] Based on the same inventive concept, in a fourth aspect, an embodiment of the present application further provides an interlocking circuit control method in a new energy power system, which is applied to the interlocking circuit in the third aspect, and the method includes:

[0047] When the first sensor detects that the incoming line side of the high-voltage switch cabinet is energized, the display contact is closed and the electromagnetic lock locks the grounding switch operating shaft to prevent the grounding switch from being operated.

[0048] According to the high-voltage switch cabinet, interlocking circuit, high-voltage switch cabinet control method under the new energy power system and interlocking circuit control method provided in the embodiments of the present application, on the one hand, the high-voltage switch cabinet includes a cabinet body and a high-voltage switch installed on the cabinet body, and the high-voltage switch includes a grounding switch, a disconnecting switch, a high-voltage circuit breaker and a first interlocking structure. The grounding switch, the disconnecting switch and the high-voltage circuit breaker are respectively connected to the first interlocking structure, that is, the disconnecting switch, the grounding switch and the high-voltage circuit breaker are highly integrated into one through the first interlocking structure, so that the high-voltage switch becomes an integrated miniaturized switch structure. , which can further reduce the volume of the high-voltage switch cabinet, thereby realizing the miniaturization of the high-voltage switch cabinet; on the other hand, the first interlocking structure and the cabinet body cooperate with each other. When closing the switch, the grounding switch is first opened, and then the isolating switch is closed, and then the high-voltage circuit breaker is closed. Or, when opening the switch, the high-voltage circuit breaker is first opened, and then the isolating switch is opened, and then the grounding switch is closed. It can ensure that the high-voltage circuit breaker cannot pull the isolating switch when closing the switch, and when the isolating switch is opened, the high-voltage circuit breaker cannot be closed, so as to realize the function of preventing the isolating switch from being opened and closed under load. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic structural diagram of a high-voltage switchgear provided in an embodiment of the present application is shown;

[0050] Figure 2 Another structural schematic diagram of a high-voltage switchgear provided in an embodiment of the present application is shown;

[0051] Figure 3 Show Figure 2 The enlarged schematic diagram of point E in the middle;

[0052] Figure 4 Another structural schematic diagram of a high-voltage switchgear provided in an embodiment of the present application is shown;

[0053] Figure 5 A schematic diagram of the structure of an interlocking circuit provided in an embodiment of the present application is shown;

[0054] Figure 6 A schematic diagram showing a principle of an interlocking circuit provided in an embodiment of the present application is shown;

[0055] Figure 7 Another schematic diagram showing the principle of the interlocking circuit provided in the embodiment of the present application;

[0056] Figure 8 A schematic diagram showing a flow chart of a high-voltage switch cabinet control method in a new energy power system provided by an embodiment of the present application;

[0057] Fig. 9 A flow chart of an interlocking circuit control method in a new energy power system provided in an embodiment of the present application is shown.

[0058] Description of reference numerals:

[0059] 10. Cabinet; 11. Channel steel column; 12. Switch panel; 20. High-voltage switch; 21. Earthing switch; 22. Disconnector; 23. High-voltage circuit breaker; 24. First interlocking structure; 241. Interlocking main board; 242. Movable lock plate; 243. Pull pin; 244. Earthing switch operating shaft; 244a. First main body; 244b. First connecting rod; 244c. First crank arm; 245. Disconnector operating shaft; 245a. Second main body; 246, high-voltage circuit breaker control assembly; 246a, energy storage hole; 246b, first closing button; 246c, opening button; 25, first sensor; 100, high-voltage switchgear; 210, low-voltage circuit breaker; 220, step-up transformer; B, first position; C, second position; D, third position; A, fourth position; DS, electromagnetic lock; DXN, display; FK, auxiliary normally closed contact; 1SBC, second closing button; HQ, closing coil. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0061] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0063] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] As described in the background technology, the environment of the new energy industry is outdoor, windy, long sunshine and other harsh areas. Some are built on the sea, beach or mountain. It is inconvenient to build civil substations. They are often prefabricated in factories, which requires the high-voltage switchgear used to be small. Because the energy distribution of each new energy site is uneven, some places have sufficient energy and the capacity is larger, and some places have insufficient energy and the capacity is smaller. This requires the high-voltage switchgear used to be highly compatible and suitable for use in substations of different capacity levels.

[0065] Example 1

[0066] like Figures 1 to 4 As shown, the high-voltage switch cabinet 100 provided in the embodiment of the present application may include a cabinet body 10 and a high-voltage switch 20 .

[0067] The cabinet body 10 may be a frame structure of the high-voltage switch cabinet 100 and a mechanical carrier of the high-voltage switch 20 .

[0068] The high-voltage switch 20 can be a device inside the high-voltage switch cabinet 100, which plays the function of connecting and disconnecting between the power grid and the electric energy converted from new energy. That is, the high-voltage switch 20 can conduct the electric energy converted from the power grid and new energy, or disconnect the electric energy converted from the power grid and new energy.

[0069] The high voltage switch 20 may be mounted on the cabinet 10, and may include a grounding switch 21, an isolating switch 22, a high voltage circuit breaker 23 and a first interlocking structure 24. The grounding switch 21, the isolating switch 22 and the high voltage circuit breaker 23 are connected to the first interlocking structure 24, respectively.

[0070] The grounding switch 21 can be used to connect or disconnect the circuit and the ground.

[0071] The isolation switch 22 may be used to isolate the circuit.

[0072] The high voltage circuit breaker 23, also known as a vacuum switch, can be used to connect or disconnect a circuit.

[0073] Among them, the first interlocking structure 24 and the cabinet 10 cooperate with each other to first open the grounding switch 21 when closing the switch, then close the isolating switch 22, and then close the high-voltage circuit breaker 23, or, when opening the switch, first open the high-voltage circuit breaker 23, then open the isolating switch 22, and then close the grounding switch 21.

[0074] The first interlocking structure 24 can be a structure that cooperates with the cabinet 10 to realize the interlocking function, that is, when closing the circuit, the grounding switch 21 is first opened, and then the isolating switch 22 is closed, and then the high-voltage circuit breaker 23 is closed; or, when opening the circuit, the high-voltage circuit breaker 23 is first opened, and then the isolating switch 22 is opened, and then the grounding switch 21 is closed.

[0075] According to the high-voltage switch cabinet provided by the embodiment of the present application, on the one hand, the high-voltage switch cabinet includes a cabinet body and a high-voltage switch installed on the cabinet body, the high-voltage switch includes a grounding switch, a disconnecting switch, a high-voltage circuit breaker and a first interlocking structure, the grounding switch, the disconnecting switch and the high-voltage circuit breaker are respectively connected to the first interlocking structure, that is, the disconnecting switch, the grounding switch and the high-voltage circuit breaker are highly integrated into one through the first interlocking structure, so that the high-voltage switch becomes an integrated miniaturized switch structure, which can further reduce the volume of the high-voltage switch cabinet, thereby realizing the miniaturization of the high-voltage switch cabinet; on the other hand, the first interlocking structure and the cabinet body cooperate with each other, when closing the switch, the grounding switch is first opened, then the disconnecting switch is closed, and then the high-voltage circuit breaker is closed, or, when opening the switch, the high-voltage circuit breaker is first opened, then the disconnecting switch is opened, and then the grounding switch is closed, which can ensure that the high-voltage circuit breaker cannot pull the disconnecting switch when closing the switch, and when the disconnecting switch is opened, the high-voltage circuit breaker cannot be closed, so as to realize the function of preventing the disconnecting and closing of the disconnecting switch under load.

[0076] In some embodiments, the cabinet 10 may include:

[0077] A channel steel column 11, on which a high-voltage switch 20 is mounted;

[0078] The switch panel 12 is mounted on the interlocking main board 241 of the first interlocking structure 24 and is provided with a first grounding switch operating hole (not shown in the figure) and a first isolating switch operating hole (not shown in the figure).

[0079] Exemplarily, the high-voltage switch 20 can be installed on a channel steel column 11 that is perpendicular to the operating surface through the high-voltage switch mounting hole to provide a stable support structure, optimize space utilization, enhance the electrical safety and heat dissipation performance of the high-voltage switch cabinet 100, and reduce installation and maintenance costs.

[0080] Exemplarily, corresponding switch mounting holes may be provided on the channel steel column 11 according to requirements of various switches such as the grounding switch 21 and the isolating switch 22 , so as to facilitate installation of various switches on the channel steel column 11 .

[0081] Exemplarily, the switch panel 12 may be mounted on the interlocking main board 241 of the first interlocking structure 24 through a switch panel mounting hole (not shown).

[0082] Exemplarily, the first grounding switch operating hole can cooperate with the second grounding switch operating hole below to provide a basis for closing or opening the grounding switch 21; the first isolating switch operating hole can cooperate with the second isolating switch operating hole below to provide a basis for closing or opening the isolating switch 22.

[0083] In some embodiments, three sides of the cabinet 10 are open.

[0084] For example, the left and right sides and the rear side of the cabinet 10 are open, the left side and the rear side of the cabinet 10 can be conveniently connected with the factory prefabricated box, and the right side of the cabinet 10 can be well connected with transformers of various capacity levels. That is, the left and right sides and the rear side of the cabinet 10 are open, which is convenient for connecting with the factory prefabricated box and transformers of various capacities to meet the compatibility requirements of the high-voltage switchgear.

[0085] In some embodiments, Figure 2 and Figure 4 As shown, the first interlocking structure 24 includes:

[0086] Interlocking main board 241;

[0087] The movable lock plate 242 is arranged on the interlocking main plate 241, and the movable lock plate 242 is provided with a second grounding switch operating hole (not shown in the figure) and a second isolating switch operating hole (not shown in the figure);

[0088] The pull pin 243 is arranged on the interlocking main board 241 and connected to the movable lock plate 242, and is used to cooperate with the movable lock plate 242 to control the alignment or non-alignment of the first grounding switch operating hole with the second grounding switch operating hole, and / or to control the alignment or non-alignment of the first isolating switch operating hole with the second isolating switch operating hole;

[0089] The grounding switch operating shaft 244 is disposed on the interlocking main board 241 and connected to the grounding switch 21, and is used to close or open the grounding switch 21 when the first grounding switch operating hole is aligned with the second grounding switch operating hole;

[0090] The isolating switch operating shaft 245 is disposed on the interlocking main board 241 and connected to the isolating switch 22, and is used to close or open the isolating switch 22 when the first isolating switch operating hole and the second isolating switch operating hole are aligned;

[0091] The high-voltage circuit breaker control component 246 is arranged on the interlock main board 241 and connected to the high-voltage circuit breaker 23. It is used to close or open the high-voltage circuit breaker 23 when the first grounding switch operating hole and the second grounding switch operating hole are not aligned, and the first isolating switch operating hole and the second isolating switch operating hole are not aligned.

[0092] Exemplarily, the movable locking plate 242 , the pull pin 243 , the earthing switch operating shaft 244 , the isolating switch operating shaft 245 and the high-voltage circuit breaker control assembly 246 may be arranged on the same side of the interlocking main plate 241 .

[0093] It should be noted that in the embodiments of the present application, alignment may be concentricity and non-alignment may be non-concentricity. For example, the alignment of the first isolating switch operating hole and the second isolating switch operating hole means that the first isolating switch operating hole and the second isolating switch operating hole are concentric, and the non-alignment of the first grounding switch operating hole and the second grounding switch operating hole means that the first grounding switch operating hole and the second grounding switch operating hole are non-concentric.

[0094] It is understandable that the switch panel 12 and the movable lock plate 242 both have holes corresponding to the grounding switch 21, the isolating switch 22 and the energy storage mechanism, and it is only possible to operate the corresponding switch or energy storage mechanism when the holes corresponding to the same switch or energy storage mechanism are concentric. For example, if you want to operate the grounding switch 21, the first grounding switch operating hole on the switch panel 12 and the second grounding switch operating hole on the movable lock plate 242 are concentric, and it is possible to operate the grounding switch 21.

[0095] Exemplarily, when closing the switch, the pull pin 243 cooperates with the movable lock plate 242 to control the alignment of the first grounding switch operating hole and the second grounding switch operating hole, and the grounding switch operating shaft 244 is driven to rotate by the operating handle to open the grounding switch 21; the pull pin 243 cooperates with the movable lock plate 242 to control the alignment of the first isolating switch operating hole and the second isolating switch operating hole, and the isolating switch operating shaft 245 is driven to rotate by the operating handle to close the isolating switch 22; the pull pin 243 cooperates with the movable lock plate 242 to control the misalignment of the first grounding switch operating hole and the second grounding switch operating hole, and the misalignment of the first isolating switch operating hole and the second isolating switch operating hole, and the high-voltage circuit breaker control component 246 closes the isolating switch 22;

[0096] When opening the switch, the pull pin 243 cooperates with the movable lock plate 242 to control the misalignment of the first grounding switch operating hole and the second grounding switch operating hole, and the misalignment of the first isolating switch operating hole and the second isolating switch operating hole, and the high-voltage circuit breaker control component 246 opens the isolating switch 22; the pull pin 243 cooperates with the movable lock plate 242 to control the alignment of the first isolating switch operating hole and the second isolating switch operating hole, and the isolating switch operating shaft 245 is driven to rotate by the operating handle to open the isolating switch 22; the pull pin 243 cooperates with the movable lock plate 242 to control the alignment of the first grounding switch operating hole and the second grounding switch operating hole, and the grounding switch operating shaft 244 is driven to rotate by the operating handle to close the grounding switch 21.

[0097] In some embodiments, Figure 2 As shown, the grounding switch operating shaft 244 includes a first body 244a and a first crank arm 244c.

[0098] The first body 244a and the first crank arm 244c are connected by a first connecting rod 244b;

[0099] Under the control of the operating handle, the first body 244a drives the first crank arm 244c to rotate through the first connecting rod 244b, thereby driving the grounding switch 21 to rotate, so as to close or open the grounding switch 21.

[0100] In some embodiments, the isolating switch operating shaft 245 includes a second body 245a and a second crank arm.

[0101] The second body 245a and the second crank arm (not shown in the figure) are connected in transmission via a second connecting rod (not shown in the figure);

[0102] Under the control of the operating handle, the second body 245a drives the second crank arm to rotate through the second connecting rod, thereby driving the disconnector 22 to rotate, so as to close or open the disconnector 22;

[0103] In some embodiments, Figure 2 As shown, the high-voltage circuit breaker control assembly 246 includes an energy storage hole 246a, an energy storage mechanism (not shown), a first closing button 246b and an opening button 246c.

[0104] The energy storage hole 246a, the first closing button 246b and the opening button 246c are respectively connected to the energy storage mechanism. The energy storage hole 246a is used to control the energy storage mechanism to store energy. The first closing button 246b is used to control the energy storage mechanism to be connected to the high-voltage circuit breaker 23 to close the high-voltage circuit breaker 23. The opening button 246c is used to control the energy storage mechanism not to be connected to the high-voltage circuit breaker 23 to open the high-voltage circuit breaker 23.

[0105] Illustratively, the energy storage mechanism may include a spring.

[0106] Exemplarily, the energy storage hole 246a may be a manual energy storage hole or an automatic energy storage hole.

[0107] Exemplarily, the first closing button 246b may be a manual closing button or an automatic closing button; the opening button 246c may be a manual opening button or an automatic opening button.

[0108] Exemplarily, the energy storage hole 246a controls the energy storage mechanism to store energy, the first closing button 246b controls the energy storage mechanism to be connected to the high-voltage circuit breaker 23 to close the high-voltage circuit breaker 23; the opening button 246c controls the energy storage mechanism to not be connected to the high-voltage circuit breaker 23 to open the high-voltage circuit breaker 23.

[0109] In some examples, a first prompt sign (not shown) is provided on one side of the first closing button 246b, and the first prompt sign is used to indicate that this is a closing button; a second prompt sign (not shown) is provided on one side of the opening button 246c, and the second prompt sign is used to indicate that this is an opening button. For example, a first prompt sign of "closing button" is provided below the first closing button 246b, and a second prompt sign of "opening button" is provided below the opening button 246c to prevent the circuit breaker from being opened or closed by mistake.

[0110] In some embodiments, Figure 3 As shown, when the pull pin 243 is located at the first position B, the pull pin 243 cooperates with the movable locking plate 242 to control the first grounding switch operating hole to align with the second grounding switch operating hole;

[0111] Alternatively, when the pull pin 243 is located at the second position C, the pull pin 243 cooperates with the movable lock plate 242 to control the first isolating switch operating hole to align with the second isolating switch operating hole;

[0112] Alternatively, when the pull pin 243 is located at the third position D, the pull pin 243 cooperates with the movable locking plate 242 to control the misalignment of the first grounding switch operating hole and the second grounding switch operating hole, and the misalignment of the first isolating switch operating hole and the second isolating switch operating hole.

[0113] In some examples, the pull pin 243 is switched to the first position B so that the pull pin 243 cooperates with the movable locking plate 242 to control the alignment of the first grounding switch operating hole with the second grounding switch operating hole; the pull pin 243 is switched to the second position C so that the pull pin 243 cooperates with the movable locking plate 242 to control the alignment of the first isolating switch operating hole with the second isolating switch operating hole; the pull pin 243 is switched to the third position D so that the pull pin 243 cooperates with the movable locking plate 242 to control the misalignment of the first grounding switch operating hole and the second grounding switch operating hole, and the misalignment of the first isolating switch operating hole and the second isolating switch operating hole.

[0114] In other examples, the pull pin 243 is switched to the fourth position A, so that the pull pin 243 cooperates with the movable lock plate 242, and the movable lock plate 242 is controlled to unlock the interlock with the high-voltage switch cabinet 100, so that the cabinet door of the high-voltage switch cabinet 100 can be opened for maintenance and overhaul. More specifically, the pull pin 243 can be switched to the fourth position A, which may include: switching the pull pin 243 from the first position B to the fourth position A.

[0115] In some more specific examples, switching the pull pin 243 to the first position B may include switching the pull pin 243 from the fourth position A to the first position B, or from the third position C to the first position B; switching the pull pin 243 to the second position C may include switching the pull pin 243 from the first position B to the second position C, or from the third position D to the second position C; switching the pull pin 243 to the third position D may include switching the pull pin 243 from the second position C to the third position D.

[0116] It should be noted that in this article, Figure 3 As shown, the first position B can be a test position, and the grounding switch 21 can be operated; the second position C can be a circuit breaker (i.e., a high-voltage circuit breaker 23) disconnect position, and the isolating switch 22 can be operated; the third position D can be a working position, and the circuit breaker can be operated; the fourth position A can be a maintenance position, and the front door can be opened / closed.

[0117] In some embodiments, an electromagnetic lock DS is disposed on the switch panel 12 , and the electromagnetic lock DS is used to lock the grounding switch operating shaft 244 to prevent the grounding switch 21 from being operated.

[0118] Exemplarily, the pull pin 243 cooperates with the movable lock plate 242 to control the alignment of the first isolating switch operating hole with the second isolating switch operating hole, and the key is inserted into the electromagnetic lock DS to lock the grounding switch operating shaft 244, and the isolating switch operating shaft 245 is driven to rotate through the operating handle to close the isolating switch 22.

[0119] In some embodiments, the high-voltage switch 20 further includes a first sensor 25 , and the first sensor 25 is used to detect whether the incoming line side of the high-voltage switch cabinet 100 is energized.

[0120] Exemplarily, the first sensor 25 may be a high-voltage sensor on the incoming line side of the high-voltage switchgear 100 .

[0121] Exemplarily, when the first sensor 25 detects that the incoming line side of the high-voltage switch cabinet is not energized, the pull pin 243 cooperates with the movable lock plate 242 to control the alignment of the first grounding switch operating hole and the second grounding switch operating hole, and the grounding switch operating shaft 244 is driven to rotate through the operating handle to close the grounding switch 21.

[0122] It should be noted that the high-voltage switchgear provided in the embodiment of the present application can be applied to a 35kV power system. When operating the grounding switch 21, the pull pin 243 must be in the first position B. When the pull pin 243 is switched from the second position C to the first position B, it is not random, but is determined by whether the first sensor 25 on the incoming line side carries 35kV high voltage electricity. When the first sensor 25 carries 35kV high voltage electricity, the electromagnetic lock DS cannot be unlocked, and the pull pin 243 cannot be switched from the second position C to the first position B, and the grounding switch 21 cannot be operated, so that the interlocking of the grounding switch 21 is more reliable.

[0123] After extensive research, the inventors found that in traditional high-voltage switchgear, only the upper end of the switch is energized, and the lower end of the switch is not energized. In this way, after the high-voltage circuit breaker is opened, the isolating switch is opened, the grounding switch is closed, and the interlock with the door is unlocked, maintenance personnel can enter the traditional high-voltage switchgear for maintenance. However, the high-voltage switchgear of new energy sources not only has the upper end of the switch energized, but also the lower end of the switch. If the mechanical structure set by the traditional high-voltage switchgear is used, it will cause a serious accident of a three-phase short circuit when the grounding switch is closed, which will bring danger to the new energy power system. The "five-protection" interlocking of the new energy high-voltage switchgear provided in the embodiment of the present application adds an electrical interlocking function on the basis of the "five-protection" interlocking of the traditional high-voltage switchgear.

[0124] Among them, the "five-prevention" interlocking function is a safety measure of the high-voltage switch cabinet, which can ensure the safety requirements of the operation and maintenance of the users. Specifically, the "five-prevention" interlocking refers to preventing the circuit breaker from being opened or closed by mistake, preventing the disconnector from being opened or closed with load, preventing the mistaken entry into the live interval, preventing the earthing switch from being closed with power on, and preventing the earthing switch from being powered on when it is closed. The specific scheme of the electrical interlocking function is: using the first sensor 25 to detect whether the lower end of the switch is energized, if it is energized, it will trigger the lock pin of the electromagnetic lock DS near the operating shaft 244 of the earthing switch, and the lock pin will lock the operating shaft 244 of the earthing switch, making the earthing switch 21 unable to operate, avoiding the possibility of closing the earthing switch 21 when the lower end of the high-voltage circuit breaker 23 is energized, and it is impossible to unlock the interlock between the earthing switch 21 and the door, preventing people from mistakenly entering the live interval, thereby achieving the functions of preventing the earthing switch 21 from being closed with power on and preventing mistaken entry into the live interval.

[0125] Example 2

[0126] like Figure 2 , Figures 5 and 6 As shown, the interlocking circuit provided in the embodiment of the present application may include the high-voltage switch cabinet 100 and the display DXN of any one of Embodiment 1.

[0127] The first sensor 25 of the high-voltage switch 20 is used to detect whether the incoming line side of the high-voltage switch cabinet is energized; an electromagnetic lock DS is provided on the switch panel 12 of the cabinet body 10;

[0128] The display DXN is provided with a display contact (not shown in the figure), which is electrically connected to the first sensor 25 and the electromagnetic lock DS, and is used to close when the first sensor 25 detects that the incoming line side of the high-voltage switch cabinet 100 is energized, so that the electromagnetic lock DS locks the grounding switch operating shaft 244 of the first interlocking structure 24, thereby blocking the operation of the grounding switch 21.

[0129] Exemplarily, the electromagnetic lock DS may be installed near the earthing switch operating shaft 244 .

[0130] Exemplarily, the display DXN can be a live display, and its function is to close the display contact when there is electricity at the lower end of the high-voltage switch 20 through the electricity sensed by the first sensor 25. When the electricity sent by the new energy is converted into high voltage electricity through the step-up transformer 220, the lower end of the high-voltage switch 20 is charged with high voltage electricity. After the first sensor 25 senses the high voltage electricity, the display contact is controlled to close, the electromagnetic lock circuit is connected, and the lock pin of the electromagnetic lock DS pops out, and the lock pin locks the grounding switch operating shaft 244, thereby blocking the operation of the grounding switch 21.

[0131] In some embodiments, Figure 7 As shown, the grounding switch 21 is provided with an auxiliary normally closed contact FK, which is used to close when the grounding switch 21 is opened, or to open when the grounding switch 21 is closed;

[0132] The interlocking circuit also includes:

[0133] The low-voltage switch cabinet includes a low-voltage circuit breaker 210 and a second closing button 1SBC. The low-voltage circuit breaker 210 includes a closing coil HQ. The auxiliary normally closed contact FK is connected between the second closing button 1SBC and the closing coil HQ. The second closing button 1SBC is used to control the closing of the low-voltage circuit breaker 210 when the auxiliary normally closed contact FK is closed.

[0134] Exemplarily, the closing button 1SBC may be an automatic closing button.

[0135] Exemplarily, when the grounding switch 21 is in the open state, the auxiliary normally closed contact FK is in the on state, and the closing button 1SBC is pressed, the low-voltage circuit breaker 210 can be closed, and the electricity generated by the renewable energy can be transmitted to the power grid through the step-up transformer 220; when the grounding switch 21 is in the closed state, FK is in the open state, the low-voltage circuit breaker 210 cannot be closed, and the electricity generated by the renewable energy cannot be converted into high voltage through the step-up transformer 220, thereby avoiding the occurrence of three-phase short circuit accidents and realizing the interlocking function of preventing power from being supplied when the grounding switch is closed.

[0136] It should be noted that the auxiliary normally closed contact FK of the grounding switch is connected in series in the closing circuit of the low-voltage frame circuit breaker (i.e., the low-voltage circuit breaker 210 in the low-voltage switch cabinet) that controls the new energy. The low-voltage circuit breaker 210 can be closed only when the grounding switch 21 is in the open position. Once the grounding switch is closed, the auxiliary normally closed contact FK is converted into a normally open contact (i.e., closed), and the closing circuit of the low-voltage circuit breaker 210 is disconnected, and the low-voltage circuit breaker 210 will not be able to be closed, thereby realizing the interlocking function of preventing power from being supplied when the grounding switch 21 is closed. That is, in the embodiment of the present application, the electrical interlocking function is used to prevent power from being supplied when the grounding switch is closed.

[0137] In order to better understand the control principle of the interlocking circuit provided in the embodiment of the present application, a more specific embodiment is described below.

[0138] like Figures 1 to 7 As shown, power on and work: switch the pull pin 243 to position B (i.e., the first position B), at which time the operating hole of the grounding switch is concentric with (i.e., aligned with) one of the shaft holes of the movable lock plate, insert the operating handle into the operating shaft 244 of the grounding switch and rotate it, and the connecting rod (the first connecting rod 244b) on the shaft drives the turning arm (i.e., the first turning arm 244c) of the operating shaft of the grounding switch to rotate, so as to realize the opening of the grounding switch 21; switch the pull pin 243 from position B to position C (i.e., the second position C), at which time the operating hole of the isolating switch is concentric with (i.e., aligned with) another shaft hole of the movable lock plate, insert the key into the electromagnetic lock DS to lock this position, insert the operating handle into the operating shaft 245 of the isolating switch and rotate it, and the turning arm (i.e., the first turning arm 244c .... The arm (i.e., the second crank arm) drives the isolating switch 22 to rotate, so that the isolating switch 22 is closed; the pull pin 243 is switched to the D position (i.e., the third position D), at this time, the movable lock plate 242 blocks the operating holes of the grounding switch and the isolating switch (i.e., the first grounding switch operating hole and the first isolating switch operating hole), and the isolating switch 22 and the grounding switch 21 cannot be operated. Only the manual energy storage hole (i.e., the energy storage hole) is exposed, and the operating mechanism (i.e., the energy storage mechanism) of the circuit breaker (i.e., the high-voltage circuit breaker 23) can be stored with energy (it can also be stored electrically) through the manual energy storage hole, and the manual closing button (it can also be pressed The electric closing button, i.e., the first closing button 246b) is pressed to close the circuit breaker (i.e., the high-voltage circuit breaker).

[0139] Power-off maintenance: Press the manual trip button (or electric trip button) to trip the circuit breaker. Move the pin from position D to position C, insert the operating handle into the disconnector operating shaft 245 and rotate it, and the crank arm on the shaft drives the disconnector 22 to rotate, so as to realize the disconnector 22 tripping; at this time, the sensor on the right (i.e., the first sensor 25) detects whether the incoming line side is energized. If it is energized, the electromagnetic lock DS cannot be unlocked; if it is not energized, press the button of the electromagnetic lock DS to unlock it, move the pin 243 from position C to position B, insert the operating handle into the grounding switch operating shaft 244 and rotate it, and the connecting rod on the shaft drives the crank arm of the grounding switch operating shaft 244 to rotate, so as to realize the closing of the grounding switch 21; move the pin from position B to position A (i.e., the fourth position A), and the movable lock plate 242 is unlocked from the interlock with the switch cabinet (i.e., the high-voltage switch cabinet 100), and the door can be opened for maintenance and inspection.

[0140] Example 3

[0141] like Figure 8 As shown, the high-voltage switchgear control method in the new energy power system provided in the embodiment of the present application can be applied to any high-voltage switchgear of Example 1, and the method may include step S810.

[0142] S810. By controlling the first interlocking structure and the cabinet to cooperate with each other, when closing the circuit breaker, the grounding switch is first opened, then the isolating switch is closed, and then the high-voltage circuit breaker is closed; or, when opening the circuit breaker, the high-voltage circuit breaker is first opened, then the isolating switch is opened, and then the grounding switch is closed.

[0143] According to the high-voltage switch cabinet control method under the new energy power system provided by the embodiment of the present application, on the one hand, the high-voltage switch cabinet includes a cabinet body and a high-voltage switch installed on the cabinet body, the high-voltage switch includes a grounding switch, a disconnecting switch, a high-voltage circuit breaker and a first interlocking structure, the grounding switch, the disconnecting switch and the high-voltage circuit breaker are respectively connected to the first interlocking structure, that is, the disconnecting switch, the grounding switch and the high-voltage circuit breaker are highly integrated into one through the first interlocking structure, so that the high-voltage switch becomes an integrated miniaturized switch structure, which can further reduce the volume of the high-voltage switch cabinet, thereby realizing the miniaturization of the high-voltage switch cabinet; on the other hand, the first interlocking structure and the cabinet body cooperate with each other, when closing the switch, the grounding switch is first opened, then the disconnecting switch is closed, and then the high-voltage circuit breaker is closed, or, when opening the switch, the high-voltage circuit breaker is first opened, then the disconnecting switch is opened, and then the grounding switch is closed, which can ensure that the high-voltage circuit breaker cannot pull the disconnecting switch when closing the switch, and when the disconnecting switch is opened, the high-voltage circuit breaker cannot be closed, so as to realize the function of preventing the disconnecting and closing of the disconnecting switch with load.

[0144] The high-voltage switchgear control method under the new energy power system provided in the embodiment of the present application can be applied to the high-voltage switchgear provided in Example 1, that is, it has the beneficial effects and implementation methods of the high-voltage switchgear provided in Example 1 of the present application. For details, please refer to the specific description of the high-voltage switchgear in the above Example 1, and this embodiment will not be repeated here.

[0145] Example 4

[0146] like Fig. 9 As shown, the interlocking circuit control method under the new energy power system provided in the embodiment of the present application can be applied to the interlocking circuit of any one of the embodiments 2, and the method may include step S910.

[0147] S910. When the first sensor detects that the incoming line side of the high-voltage switch cabinet is energized, the display contact is closed, and the electromagnetic lock locks the grounding switch operating shaft to prevent the grounding switch from being operated.

[0148] It should be noted that the interlocking loop control method under the new energy power system in the embodiment of the present application is the relationship between the grounding switch on the 35kV side and the frame circuit breaker (i.e., low-voltage circuit breaker) on the low-voltage side (1140V / 800V / 690V). When the high-voltage grounding switch (i.e., grounding switch) is in the closed position, the frame circuit breaker (i.e., low-voltage circuit breaker) on the low-voltage side cannot be closed, and the electricity generated by new energy cannot be transmitted to the power grid.

[0149] The interlocking circuit control method under the new energy power system provided in the embodiment of the present application can be applied to any interlocking circuit in Example 2, that is, it has the beneficial effects and implementation methods of the interlocking circuit provided in Example 2 of the present application. For details, please refer to the specific description of the interlocking circuit in the above Example 2, and this embodiment will not be repeated here.

[0150] It should be noted that the high voltage in this article can be a voltage level of AC voltage 1kV and above, such as 6kV, 10kV, 35kV, 110kV, 220kV, etc. Low voltage usually refers to a voltage level below AC voltage 1 kilovolt, such as 220V and 380V.

[0151] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present application, but the present application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of the present application, and these modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A high voltage switch cabinet, characterized in that: include: Cabinet (10); A high-voltage switch (20) is installed on the cabinet (10), comprising a grounding switch (21), an isolating switch (22), a high-voltage circuit breaker (23) and a first interlocking structure (24); the grounding switch (21), the isolating switch (22) and the high-voltage circuit breaker (23) are respectively connected to the first interlocking structure (24); The first interlocking structure (24) and the cabinet (10) cooperate with each other to, when closing the switch, first open the grounding switch (21), then close the isolating switch (22), and then close the high-voltage circuit breaker (23); or, when opening the switch, first open the high-voltage circuit breaker (23), then open the isolating switch (22), and then close the grounding switch (21).

2. The high voltage switch cabinet according to claim 1, characterized in that: The cabinet (10) comprises: A channel steel column (11), the high-voltage switch (20) being mounted on the channel steel column (11); The switch panel (12) is mounted on the interlocking main board (241) of the first interlocking structure (24) and is provided with a first grounding switch operating hole and a first isolating switch operating hole.

3. The high voltage switch cabinet according to claim 2, characterized in that: The first interlocking structure (24) comprises: Interlocking main board (241); A movable lock plate (242) is arranged on the interlocking main plate (241), and a second grounding switch operating hole and a second isolating switch operating hole are arranged on the movable lock plate (242); A pull pin (243) is arranged on the interlocking main board (241) and connected to the movable lock plate (242), and is used to cooperate with the movable lock plate (242) to control the alignment or non-alignment of the first earthing switch operating hole with the second earthing switch operating hole, and / or to control the alignment or non-alignment of the first isolating switch operating hole with the second isolating switch operating hole; An earthing switch operating shaft (244) is arranged on the interlocking main board (241) and connected to the earthing switch (21), and is used to close or open the earthing switch (21) when the first earthing switch operating hole is aligned with the second earthing switch operating hole; An isolating switch operating shaft (245) is arranged on the interlocking main board (241) and is connected to the isolating switch (22), and is used to close or open the isolating switch (22) when the first isolating switch operating hole and the second isolating switch operating hole are aligned; A high-voltage circuit breaker control component (246) is arranged on the interlocking main board (241) and connected to the high-voltage circuit breaker (23), and is used to close or open the high-voltage circuit breaker (23) when the first grounding switch operating hole and the second grounding switch operating hole are not aligned, and the first isolating switch operating hole and the second isolating switch operating hole are not aligned.

4. The high voltage switch cabinet according to claim 3, characterized in that: The grounding switch operating shaft (244) comprises a first body (244a) and a first crank arm (244c). The first main body (244a) and the first crank arm (244c) are transmission-connected via a first connecting rod (244b); Under the control of the operating handle, the first body (244a) drives the first crank arm (244c) to rotate through the first connecting rod (244b), thereby driving the grounding switch (21) to rotate, so as to close or open the grounding switch (21); and / or, The isolating switch operating shaft (245) comprises a second body (245a) and a second crank arm. The second main body (245a) and the second crank arm are connected in transmission via a second connecting rod; Under the control of the operating handle, the second body (245a) drives the second crank arm to rotate through the second connecting rod, thereby driving the disconnector (22) to rotate, so as to close or open the disconnector (22); and / or, The high-voltage circuit breaker control assembly (246) comprises an energy storage hole (246a), an energy storage mechanism, a first closing button (246b) and an opening button (246c), The energy storage hole (246a), the first closing button (246b) and the opening button (246c) are respectively connected to the energy storage mechanism; the energy storage hole (246a) is used to control the energy storage mechanism to store energy; the first closing button (246b) is used to control the energy storage mechanism to be connected to the high-voltage circuit breaker (23) so as to close the high-voltage circuit breaker (23); and the opening button (246c) is used to control the energy storage mechanism not to be connected to the high-voltage circuit breaker (23) so as to open the high-voltage circuit breaker (23).

5. The high voltage switch cabinet according to claim 3, characterized in that: When the pull pin (243) is located at the first position (B), the pull pin (243) cooperates with the movable lock plate (242) to control the first grounding switch operating hole to align with the second grounding switch operating hole; Alternatively, when the pull pin (243) is located at the second position (C), the pull pin (243) cooperates with the movable lock plate (242) to control the first isolating switch operating hole to align with the second isolating switch operating hole; Alternatively, when the pull pin (243) is located at the third position (D), the pull pin (243) cooperates with the movable locking plate (242) to control the first grounding switch operating hole and the second grounding switch operating hole to be misaligned, and the first isolating switch operating hole and the second isolating switch operating hole to be misaligned.

6. The high voltage switch cabinet according to claim 3, characterized in that: An electromagnetic lock (DS) is provided on the switch panel (12), and the electromagnetic lock (DS) is used to lock the grounding switch operating shaft (244) to prevent the grounding switch (21) from being operated; The cabinet (10) has three sides that are open; And / or, the high-voltage switch (20) further comprises a first sensor (25), wherein the first sensor (25) is used to detect whether the incoming line side of the high-voltage switch cabinet is energized.

7. An interlocking circuit, characterized in that: include: The high voltage switchgear (100) according to any one of claims 1 to 6; The first sensor (25) of the high-voltage switch (20) is used to detect whether the incoming line side of the high-voltage switch cabinet is energized; an electromagnetic lock (DS) is provided on the switch panel (12) of the cabinet body (10); A display (DXN) is provided with a display contact, the display contact is electrically connected to the first sensor (25) and the electromagnetic lock (DS), and is used to close when the first sensor (25) detects that the incoming line side of the high-voltage switch cabinet is energized, so that the electromagnetic lock (DS) locks the grounding switch operating shaft (244) of the first interlocking structure, thereby blocking the operation of the grounding switch (21).

8. The interlocking circuit according to claim 7, characterized in that: The grounding switch (21) is provided with an auxiliary normally closed contact (FK) for closing when the grounding switch (21) is opened, or opening when the grounding switch (21) is closed; The interlocking circuit also includes: A low-voltage switch cabinet comprises a low-voltage circuit breaker (210) and a second closing button (1SBC), wherein the low-voltage circuit breaker (210) comprises a closing coil (HQ), the auxiliary normally closed contact (FK) is connected between the second closing button (1SBC) and the closing coil (HQ), and the second closing button (1SBC) is used to control the closing of the low-voltage circuit breaker (210) when the auxiliary normally closed contact (FK) is closed.

9. A high-voltage switchgear control method in a new energy power system, characterized in that: Applicable to the high voltage switchgear according to any one of claims 1 to 6, The method comprises: By controlling the first interlocking structure (24) and the cabinet (10) to cooperate with each other, it is achieved that when closing the switch, the grounding switch (21) is first opened, then the isolating switch (22) is closed, and then the high-voltage circuit breaker (23) is closed; or, when opening the switch, the high-voltage circuit breaker (23) is first opened, then the isolating switch (22) is opened, and then the grounding switch (21) is closed.

10. An interlocking circuit control method in a new energy power system, characterized in that: Applied to the interlocking circuit of claim 7 or 8, the method comprises: When the first sensor (25) detects that the incoming line side of the high-voltage switch cabinet (100) is energized, the display contact is closed and the electromagnetic lock (DS) locks the grounding switch operating shaft (244) to prevent the grounding switch (21) from being operated.

Images