Closing circuit and device of gas insulated switchgear and gas insulated switchgear
By introducing a switch module into the parasitic circuit of the quantile monitoring relay and disconnecting the parasitic circuit connection, the problem of the generator outlet circuit breaker being unable to close again after closing, and the matching convenience of the generator outlet circuit breaker and the operating box is achieved.
Patent Information
- Application Number
- CN202510531286.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2025-08-08
AI Technical Summary
The problem that the generator outlet circuit breaker cannot close again after closing, resulting in the failure to achieve normal operation function.
The switching module is introduced into the parasitic circuit of the quantile monitoring relay. After receiving the closing signal, the parasitic circuit is disconnected to ensure that the closing circuit is normally connected.
It solves the problem that the generator outlet circuit breaker cannot close again after closing, improves the matching convenience of the generator outlet circuit breaker and the operating box, and simplifies circuit changes.
Smart Images
Figure CN120453112A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of switchgear, and in particular to a closing circuit, a device and a gas-insulated switchgear for a gas-insulated switchgear. Background Art
[0002] Currently, some large thermal power units, particularly nuclear and hydropower units, commonly use generator circuit breakers (GCBs) to protect generators and transformers. However, domestic manufacturers currently lack the capability to produce GCBs suitable for large-capacity units. According to Article 5.1.2, Paragraph 4 of DLT5136-2012, "Technical Specification for Secondary Wiring Design of Thermal Power Plants and Substations," "an electrical locking device should be provided to prevent circuit breaker 'tripping,' preferably using an anti-trip circuit within the circuit breaker mechanism." Therefore, in practical applications, special attention must be paid to the coordination between the mechanism anti-trip relay within the generator circuit breaker control cabinet, the closing circuit monitoring module, and the position monitoring relay within the operating box.
[0003] However, in the actual operation of the high-temperature gas-cooled reactor demonstration project, there is a problem with the coordination between the generator outlet circuit breaker and the operating box. That is, the GCB cannot be closed again when it is opened after being closed, resulting in its inability to achieve normal operation function. Summary of the Invention
[0004] The present application provides a closing circuit, a device and a gas-insulated switchgear for a gas-insulated switchgear, so as to at least solve the problem in the related art that the GCB cannot be closed again after opening.
[0005] The present application provides a closing circuit for a gas-insulated switchgear, the closing circuit for the gas-insulated switchgear comprising:
[0006] A switch module is connected to the parasitic circuit of the position monitoring relay. The switch module is used to receive a disconnection signal and disconnect the parasitic circuit of the position monitoring relay after the generator output circuit breaker is closed.
[0007] The closing circuit of the gas-insulated switchgear of the present application disconnects the parasitic circuit of the position monitoring relay when receiving the closing signal through the switch module. At the same time, it ensures that the closing circuit is normal, that is, the closing circuit connection is normal. Thus, when closing, the connection of the parasitic circuit is prevented. Furthermore, when the existing operating box and generator outlet circuit breaker are used in conjunction, due to the generation of the parasitic circuit, the generator outlet circuit breaker cannot be closed again after closing or opening. The present application disconnects the connection of the parasitic circuit when closing through the switch module, thereby solving the problem that the generator outlet circuit breaker cannot be closed again after closing or opening. Moreover, the problem of matching the generator outlet circuit breaker and the operating box can be achieved only by adding a switch module, and only a small circuit change is required, thereby greatly improving the convenience of matching the generator outlet circuit breaker and the operating box.
[0008] In some optional embodiments, the switch module includes: one or more normally closed nodes of a closing circuit;
[0009] The normally closed node is connected to the parasitic circuit and is used to be disconnected when the switch is closed, so as to disconnect the position monitoring relay and the anti-trip relay.
[0010] In some optional embodiments, the parasitic circuit includes: a circuit between the positive pole of the power supply and the ground switch on the generator side;
[0011] One or more normally closed nodes of the closing circuit are connected in the circuit between the positive pole of the power supply and the ground switch on the generator side.
[0012] In some optional embodiments, the normally closed node includes: a split normally closed node and / or an anti-trip relay normally closed node;
[0013] The split normally closed node and / or the anti-trip relay normally closed node are connected in a loop between the positive pole of the power supply and the ground switch tripping switch on the generator side.
[0014] In some optional embodiments, the circuit between the positive electrode of the power supply and the generator side earth switch includes: a diode;
[0015] The first end of the split-position normally closed node and / or the anti-trip relay normally closed node is connected to the positive pole of the power supply, and the second end of the split-position normally closed node and / or the anti-trip relay normally closed node is connected to the diode.
[0016] In some optional embodiments, the first end of the split-position normally closed node and / or the anti-trip relay normally closed node is connected to the diode, and the second end of the split-position normally closed node and / or the anti-trip relay normally closed node is connected to the split-position monitoring relay.
[0017] In some optional embodiments, the first end of the split-position normally closed node and / or the anti-trip relay normally closed node is connected to the split-position monitoring relay, and the second end of the split-position normally closed node and / or the anti-trip relay normally closed node is connected to the generator side grounding switch.
[0018] In some optional embodiments, one of the split-position normally closed node or the anti-trip relay normally closed node is connected between the positive pole of the power supply and the diode, and the other of the split-position normally closed node or the anti-trip relay normally closed node is connected between the diode and the split-position monitoring relay; or,
[0019] One of the split-position normally closed node or the anti-trip relay normally closed node is connected between the diode and the split-position monitoring relay, and the other of the split-position normally closed node or the anti-trip relay normally closed node is connected between the split-position monitoring relay and the generator side earth switch trip;
[0020] One of the split-position normally closed nodes or the anti-trip relay normally closed nodes is connected between the positive pole of the power supply and the diode, and the other of the split-position normally closed nodes or the anti-trip relay normally closed nodes is connected between the split-position monitoring relay and the generator side ground switch.
[0021] The present application also provides a closing device for a gas-insulated switchgear, wherein the closing device for the gas-insulated switchgear comprises a closing circuit for the gas-insulated switchgear as described above.
[0022] The present application also provides a gas-insulated switchgear, wherein the closing device of the gas-insulated switchgear includes the closing device of the gas-insulated switchgear as described above. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0024] Figure 1 It is a traditional gas-insulated switchgear;
[0025] Figure 2 A closing circuit for a gas-insulated switchgear provided in an embodiment of the present application;
[0026] Figure 3 A detailed schematic diagram of a switch module in a gas-insulated switchgear provided in an embodiment of the present application;
[0027] Figure 4 A detailed schematic diagram of a normally closed node in a gas-insulated switchgear provided in an embodiment of the present application;
[0028] Figure 5 Another closing circuit of a gas-insulated switchgear provided in an embodiment of the present application;
[0029] Figure 6 Another closing circuit of a gas-insulated switchgear provided in an embodiment of the present application. DETAILED DESCRIPTION
[0030] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0031] It should be noted that, in the description of this application, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. The terms "first," "second," etc., in this application are used to distinguish similar objects, and are not used to describe a particular order or sequence.
[0032] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0033] Currently, some large thermal power units, particularly nuclear and hydropower units, commonly use generator circuit breakers (GCBs) to protect generators and transformers. However, domestic manufacturers currently lack the capability to produce GCBs suitable for large-capacity units. According to Article 5.1.2, Paragraph 4 of DLT5136-2012, "Technical Specification for Secondary Wiring Design of Thermal Power Plants and Substations," "an electrical locking device should be provided to prevent circuit breaker 'tripping,' preferably using an anti-trip circuit within the circuit breaker mechanism." Therefore, in practical applications, special attention must be paid to the coordination between the mechanism anti-trip relay within the generator circuit breaker control cabinet, the closing circuit monitoring module, and the position monitoring relay within the operating box.
[0034] However, in the actual operation of the high-temperature gas-cooled reactor demonstration project, the generator outlet circuit breaker uses the GCB control cabinet complete set of equipment from the Swiss manufacturer ABB, and the operation box uses the CZX series products of Nanjing Nari. The operation box is used to control the generator outlet circuit breaker. However, in actual application, there are problems with the coordination between the generator outlet circuit breaker and the operation box. Figure 1 During the coordinated use of the generator outlet circuit breaker and the operation box, a closing command is input through the operation box, and the operation box controls the GCB control cabinet to close the circuit. During closing, the generator side earth switch Q81, the main transformer side earth switch Q82, the disconnector closing Q9, and the split node S0 are turned on, causing the positive pole of the power supply, the diode D1, the split monitoring relay TWJ, the generator side earth switch Q81, the main transformer side earth switch Q82, the disconnector closing Q9, the split node S0, the anti-trip relay K1, and the negative pole of the power supply to be turned on in sequence to form a loop, causing the anti-trip relay K1 to be energized, that is, causing a parasitic circuit, causing the generator outlet circuit breaker to be closed or opened, resulting in a failure to reclose, resulting in its inability to achieve normal operation function.
[0035] The embodiment of the present application provides a closing circuit of a gas insulated switchgear, referring to Figure 2 , the closing circuit of the gas insulated switchgear comprises:
[0036] The switch module 10 is connected to the parasitic circuit of the position monitoring relay TWJ. The switch module 10 is used to receive a disconnection signal and disconnect the parasitic circuit of the position monitoring relay TWJ after the generator output circuit breaker is closed.
[0037] Specifically, the parasitic circuit of the position monitoring relay is formed by the positive power supply, diode D1, position monitoring relay TWJ, generator-side earth switch Q81, main transformer-side earth switch Q82, disconnector Q9, normally open node S0-2 of the original position relay, anti-trip relay K1, and the negative power supply. The closing circuit is formed by the positive power supply, the first node 1SHJ of the manual closing relay, the manual closing relay SHJ, the generator-side earth switch Q81, main transformer-side earth switch Q82, disconnector Q9, normally closed node K1-1 of the original anti-trip relay, the normally open node of the spring pressure relay K2, the normally open node K3, the normally closed node S0-1 of the original position relay, the closing coil, the REM terminal of the transfer relay S2, and the negative power supply.
[0038] Specifically, the disconnection signal can be a closing signal. The switch module 10 can receive any closing signal and use the closing signal as the disconnection signal. Upon receiving the disconnection signal, the switch module disconnects the parasitic circuit of the position monitoring relay TWJ. Alternatively, the switch module can be any switching device, such as a relay, an IGBT (insulated-gate bipolar transistor), or a MOS tube (metal-oxide semiconductor field-effect transistor, metal-oxide semiconductor FET).
[0039] The closing circuit of the gas-insulated switchgear of the present application disconnects the parasitic circuit of the position monitoring relay TWJ through the switch module 10 when receiving the closing signal. At the same time, it ensures that the closing circuit is normal, that is, the closing circuit connection is normal. Thus, when closing, the connection of the parasitic circuit is prevented. Furthermore, when the existing operating box and the generator outlet circuit breaker are used in conjunction, due to the generation of the parasitic circuit, the generator outlet circuit breaker cannot be closed again after closing or opening. The present application disconnects the connection of the parasitic circuit through the switch module when closing, thereby solving the problem that the generator outlet circuit breaker cannot be closed again after closing or opening. Moreover, the problem of matching the generator outlet circuit breaker and the operating box can be achieved by simply adding the switch module 10, and only a slight circuit change is required, thereby greatly improving the convenience of matching the generator outlet circuit breaker and the operating box.
[0040] In an exemplary embodiment, Figure 3 As shown, the parasitic circuit includes: a circuit between the positive pole of the power supply and the generator side earth switch Q81;
[0041] One or more normally closed nodes of the closing circuit are connected to the circuit of Q81 between the positive pole of the power supply and the ground switch on the generator side.
[0042] Specifically, the one or more normally closed nodes of the closing circuit are specifically the normally closed nodes of the target relay in the closing circuit. When the closing circuit is closed, the target relay is energized and the normally closed nodes are disconnected, that is, the normally closed nodes are disconnected when the closing circuit is in the closed state. This serves to disconnect the parasitic circuit of the position monitoring relay TWJ. It is worth noting that compared to the switch module 10, which is a switching device added to the switch module 10, which also needs to output a closing signal separately and then operate upon receiving the closing signal, resulting in a complex structure and increased cost of the switching device, the switch module 10 in the present application directly uses one or more normally closed nodes in the original closing circuit, without increasing the cost of the switching device or adding a circuit to output the closing signal, thereby simplifying the structure.
[0043] Specifically, the parasitic circuit of the position monitoring relay TWJ includes a circuit between the positive pole of the power supply and the generator side earth switch Q81, which is connected to the circuit between the positive pole of the power supply and the generator side earth switch Q81 through one or more normally closed nodes of the closing circuit, thereby not affecting the closing circuit of the operating box and the generator output circuit breaker, that is, the closing circuit is transmitted to the generator side earth switch Q81 through the first node 1SHJ of the manual closing relay and the manual closing relay SHJ. If one or more normally closed nodes of the closing circuit are connected to the circuit between the positive pole of the power supply and the generator side earth switch Q81, the closing circuit will not be disconnected when closing, thereby ensuring the normal operation of the closing circuit.
[0044] It's worth noting that the parasitic circuit between the positive power supply and the generator-side earth switch is the circuit that passes through diode D1 and the open-position monitoring relay TWJ. The open-position monitoring relay TWJ monitors the continuity of the closing circuit. That is, when the GCB is in the open position, the closing circuit should be open, allowing the circuit to close once a closing command is received.
[0045] In an exemplary embodiment, Figure 4 As shown, the normally closed nodes include: the split normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3;
[0046] The split normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3 are connected in a loop between the positive pole of the power supply and the generator side earth switch Q81.
[0047] Specifically, the normally closed node may be a separate normally closed node S0-5. The separate normally closed node S0-5 is specifically a normally closed node of a separate relay. When the closing circuit is closed, the separate relay is energized and opens the separate normally closed node S0-5.
[0048] Specifically, the normally closed node can also be the normally closed node K1-3 of the anti-trip relay, refer to Figure 2 When the closing circuit is closed, the open relay receives power, closing the normally open node S0-2 of the original open relay. At this point, the anti-trip relay circuit is connected. The anti-trip relay circuit consists of the positive power supply, the first node 1SHJ of the manual closing relay, the manual closing relay SHJ, the generator-side earth switch Q81, the main transformer-side earth switch Q82, the disconnector closing Q9, the normally open node S0-2 of the original open relay, the anti-trip relay K1, and the negative power supply. Since the anti-trip relay circuit is connected, after the anti-trip relay K1 is energized, the normally closed node K1-3 of the anti-trip relay is opened.
[0049] In an exemplary embodiment, Figure 5 As shown, the circuit between the positive pole of the power supply and the generator side earth switch Q81 includes: a diode D1;
[0050] The first end of the split normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3 is connected to the positive pole of the power supply, and the second end of the split normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3 is connected to the diode D1.
[0051] Specifically, refer to Figure 5 (A) in Figure 5In (A), a represents the split-position normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3. That is, the split-position normally closed node S0-5 is connected between the positive pole of the power supply and the diode D1, or the anti-trip relay normally closed node K1-3 is connected between the positive pole of the power supply and the diode D1, or the first end where the split-position normally closed node S0-5 and the anti-trip relay normally closed node K1-3 are connected is connected to the positive pole of the power supply, and the second end where the split-position normally closed node S0-5 and the anti-trip relay normally closed node K1-3 are connected is connected to the diode D1.
[0052] In an exemplary embodiment, Figure 5 As shown, the first end of the split-position normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3 is connected to the diode D1, and the second end of the split-position normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3 is connected to the split-position monitoring relay TWJ.
[0053] Specifically, refer to Figure 5 (B) in Figure 5 In (B), a represents the position-dividing normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3. That is, the position-dividing normally closed node S0-5 is connected between the diode D1 and the position-dividing monitoring relay TWJ, or the anti-trip relay normally closed node K1-3 is connected between the diode D1 and the position-dividing monitoring relay TWJ, or the first end where the position-dividing normally closed node S0-5 and the anti-trip relay normally closed node K1-3 are connected is connected to the diode D1, and the second end where the position-dividing normally closed node S0-5 and the anti-trip relay normally closed node K1-3 are connected is connected to the position-dividing monitoring relay TWJ.
[0054] In an exemplary embodiment, Figure 5 As shown, the first end of the split normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3 is connected to the split monitoring relay TWJ, and the second end of the split normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3 is connected to the generator side earth switch Q81.
[0055] Specifically, refer to Figure 5 (C) in Figure 5 In (C), a is the split normally closed node S0-5 and / or the anti-trip relay normally closed node K1-3. That is, the split normally closed node S0-5 is connected between the split monitoring relay TWJ and the generator side earth switch Q81, or the anti-trip relay normally closed node K1-3 is connected between the split monitoring relay TWJ and the generator side earth switch Q81, or the first end of the split normally closed node S0-5 and the anti-trip relay normally closed node K1-3 is connected to the split monitoring relay TWJ, and the second end of the split normally closed node S0-5 and the anti-trip relay normally closed node K1-3 is connected to the generator side earth switch Q81.
[0056] In an exemplary embodiment, one of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3 is connected between the positive pole of the power supply and the diode D1, and the other of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3 is connected between the diode D1 and the split-position monitoring relay TWJ; or,
[0057] Specifically, refer to Figure 6 (A) in Figure 6 In (A), a is one of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3, and b is the other of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3.
[0058] One of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3 is connected between the diode D1 and the split-position monitoring relay TWJ, and the other of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3 is connected between the split-position monitoring relay TWJ and the generator side earth switch Q81;
[0059] Specifically, refer to Figure 6 (B) in Figure 6 In (B), a is one of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3, and b is the other of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3.
[0060] One of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3 is connected between the positive pole of the power supply and the diode D1, and the other of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3 is connected between the split-position monitoring relay TWJ and the generator side earth switch Q81.
[0061] Specifically, refer to Figure 6 (C) in Figure 6 In (C), a is one of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3, and b is the other of the split-position normally closed node S0-5 or the anti-trip relay normally closed node K1-3.
[0062] Specifically, the split normally closed node S0-5 and the anti-trip relay normally closed node K1-3 can be connected to any position in the circuit between the positive pole of the power supply and the generator-side earth switch Q81. One of the split normally closed node S0-5 or the anti-trip relay normally closed node K1-3 refers to a target normally closed node of the split normally closed node S0-5 or the anti-trip relay normally closed node K1-3, and the other of the split normally closed node S0-5 or the anti-trip relay normally closed node K1-3 refers to the remaining normally closed nodes other than the target normally closed node.
[0063] An embodiment of the present application also provides a closing device for a gas-insulated switchgear, which includes a closing circuit for the gas-insulated switchgear as described above. The switch module 10 disconnects the parasitic circuit of the position monitoring relay TWJ upon receiving a closing signal. At the same time, the closing circuit is ensured to be normal, i.e., the closing circuit connection is normal. Thus, when closing, the connection of the parasitic circuit is prevented. Furthermore, when the existing operating box and generator output circuit breaker are used together, due to the generation of a parasitic circuit, the generator output circuit breaker cannot be closed again after closing or opening. The present application disconnects the parasitic circuit when closing, thereby solving the problem of the generator output circuit breaker being unable to be closed again after closing or opening. Furthermore, the problem of matching the generator output circuit breaker and the operating box can be achieved simply by adding the switch module 10, requiring only a slight circuit change, thereby greatly improving the convenience of matching the generator output circuit breaker and the operating box.
[0064] It is worth noting that, for the description of the features in the embodiments corresponding to the closing device of the gas-insulated switchgear, reference can be made to the relevant description of the embodiments corresponding to the closing circuit of the gas-insulated switchgear, which will not be repeated here.
[0065] An embodiment of the present application also provides a gas-insulated switchgear, which includes a closing device of the gas-insulated switchgear as described above. When a closing signal is received, the switch module 10 disconnects the parasitic circuit of the position monitoring relay TWJ. At the same time, the closing circuit is guaranteed to be normal, that is, the closing circuit connection is normal. Thus, when closing, the connection of the parasitic circuit is prevented. Furthermore, when the existing operating box and generator output circuit breaker are used in conjunction, due to the generation of the parasitic circuit, the generator output circuit breaker cannot be closed again after closing or opening. The present application disconnects the connection of the parasitic circuit when closing through the switch module, thereby solving the problem that the generator output circuit breaker cannot be closed again after closing or opening. Moreover, the problem of matching the generator output circuit breaker and the operating box can be achieved by simply adding the switch module 10, and only a slight circuit change is required, thereby greatly improving the convenience of matching the generator output circuit breaker and the operating box.
[0066] It is worth noting that, for the description of the features in the embodiments corresponding to the gas insulated switchgear, reference can be made to the relevant description of the embodiments corresponding to the closing circuit of the gas insulated switchgear, which will not be repeated here.
[0067] The above is a detailed introduction to the closing circuit, device and gas-insulated switchgear provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.
Claims
1. A closing circuit of a gas-insulated switchgear, characterized in that: The closing circuit of the gas-insulated switchgear comprises: A switch module is connected to the parasitic circuit of the position monitoring relay. The switch module is used to receive a disconnection signal and disconnect the parasitic circuit of the position monitoring relay after the generator output circuit breaker is closed.
2. The closing circuit of the gas-insulated switchgear according to claim 1, characterized in that: The switch module includes: one or more normally closed nodes of the closing circuit; The normally closed node is connected to the parasitic circuit and is used to be disconnected when the switch is closed, so as to disconnect the position monitoring relay and the anti-trip relay.
3. The closing circuit of the gas-insulated switchgear according to claim 2, characterized in that: The parasitic circuit includes: a circuit between the positive pole of the power supply and the ground switch on the generator side; One or more normally closed nodes of the closing circuit are connected in the circuit between the positive pole of the power supply and the ground switch on the generator side.
4. The closing circuit of the gas-insulated switchgear according to claim 2, characterized in that: The normally closed nodes include: split normally closed nodes and / or anti-trip relay normally closed nodes; The split normally closed node and / or the anti-trip relay normally closed node are connected in a loop between the positive pole of the power supply and the ground switch tripping switch on the generator side.
5. The closing circuit of the gas-insulated switchgear according to claim 4, characterized in that: The circuit between the positive electrode of the power supply and the ground switch on the generator side includes: a diode; The first end of the split-position normally closed node and / or the anti-trip relay normally closed node is connected to the positive pole of the power supply, and the second end of the split-position normally closed node and / or the anti-trip relay normally closed node is connected to the diode.
6. The closing circuit of the gas-insulated switchgear according to claim 5, characterized in that: The first end of the position-split normally closed node and / or the anti-trip relay normally closed node is connected to the diode, and the second end of the position-split normally closed node and / or the anti-trip relay normally closed node is connected to the position-split monitoring relay.
7. The closing circuit of the gas-insulated switchgear according to claim 6, characterized in that: The first end of the split normally closed node and / or the anti-trip relay normally closed node is connected to the split monitoring relay, and the second end of the split normally closed node and / or the anti-trip relay normally closed node is connected to the generator side earth switch.
8. The closing circuit of the gas-insulated switchgear according to claim 7, characterized in that: One of the split-position normally closed node or the anti-trip relay normally closed node is connected between the positive pole of the power supply and the diode, and the other of the split-position normally closed node or the anti-trip relay normally closed node is connected between the diode and the split-position monitoring relay; or One of the split-position normally closed node or the anti-trip relay normally closed node is connected between the diode and the split-position monitoring relay, and the other of the split-position normally closed node or the anti-trip relay normally closed node is connected between the split-position monitoring relay and the generator side earth switch trip; One of the split-position normally closed nodes or the anti-trip relay normally closed nodes is connected between the positive pole of the power supply and the diode, and the other of the split-position normally closed nodes or the anti-trip relay normally closed nodes is connected between the split-position monitoring relay and the generator side ground switch.
9. A closing device for a gas-insulated switchgear, characterized in that: The closing device of the gas-insulated switchgear comprises a closing circuit of the gas-insulated switchgear according to any one of claims 1 to 8.
10. A gas insulated switchgear, characterized in that: The gas-insulated switchgear comprises the closing device of the gas-insulated switchgear according to claim 9.