Silicon controlled rectifier assembly and system of nuclear power rod control system

Abstract

The invention discloses a nuclear power rod control system silicon controlled rectifier assembly and system. The assembly comprises a mounting plate, a heat dissipation plate, a protection plate, a first silicon controlled rectifier module, a second silicon controlled rectifier module and a third silicon controlled rectifier module, the first silicon-controlled module, the second silicon-controlled module and the third silicon-controlled module are all connected with the heat dissipation plate; the heat dissipation plate is connected with the mounting plate, and a heat dissipation channel is arranged between the heat dissipation plate and the mounting plate; a protection plate is arranged at the upper parts of the first silicon-controlled module, the second silicon-controlled module and the third silicon-controlled module and is connected with the heat dissipation plate; the anodes of the first silicon controlled module, the second silicon controlled module and the third silicon controlled module are connected with the input end, and the cathodes of the first silicon controlled module, the second silicon controlled module and the third silicon controlled module are connected with the output end. The silicon controlled rectifier module can be quickly replaced, and the reliability of the silicon controlled rectifier module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a thyristor component and system of a nuclear power rod control system. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Silicon-Controlled Rectifier (SCR) is a common semiconductor device. SCR modules are also used in the control rod control system of nuclear power plants. Its function is to rectify AC power into DC pulsating current, output it to the control rod drive mechanism, and then drive the lifting and lowering of the control rods to control the reactor power. It is an important power component in the rod control system.

[0004] The thyristor module of the nuclear power rod control system is located in the rod control power cabinet. When the thyristor module fails, it will not be able to accurately rectify and output, which will cause the control rod to fail to move as expected, and the rod control system will not be able to respond to the nuclear power control needs in time. When such a fault occurs, it must be eliminated within the specified time, otherwise the reactor will enter the shutdown state, which directly affects the economic efficiency and operational reliability of nuclear power.

[0005] In the current nuclear power rod control system, multiple separate thyristor modules are connected to the MG circuit, LG circuit and SG circuit. When all the thyristor modules in a circuit need to be replaced, each thyristor module in the circuit needs to be disassembled and installed separately, which makes the replacement efficiency of the thyristor modules in the nuclear power rod control system low. Summary of the invention

[0006] In order to solve the above problems, the present invention proposes a thyristor assembly and system for a nuclear power rod control system, which can realize rapid replacement of the thyristor assembly on the basis of improving the reliability of the thyristor assembly.

[0007] To achieve the above object, the present invention adopts the following technical solution: In the first aspect, a thyristor assembly of a nuclear power rod control system is proposed, including a mounting plate, a heat dissipation plate, a protection plate, and a first thyristor module, a second thyristor module, and a third thyristor module that have passed reliability verification; The first thyristor module, the second thyristor module and the third thyristor module are all connected to the heat sink; the heat sink is connected to the mounting plate, and a heat dissipation channel is provided between the heat sink and the mounting plate; a protective plate is provided on the top of the first thyristor module, the second thyristor module and the third thyristor module, and the protective plate is connected to the heat sink; The anodes of the first thyristor module, the second thyristor module and the third thyristor module are connected to the input end, and the cathodes of the first thyristor module, the second thyristor module and the third thyristor module are connected to the output end; the input end is used to connect to the power bus in the nuclear power rod control system, and the output end is used to connect to the actuator.

[0008] Furthermore, the first thyristor module, the second thyristor module and the third thyristor module all include thyristors and protection circuits; the thyristors are connected to the protection circuits; the anodes of the thyristors are connected to the input terminals, and the cathodes of the thyristors are connected to the output terminals.

[0009] Furthermore, the protection circuit includes a first capacitor, a second capacitor, a first resistor, and a second resistor; the first capacitor and the first resistor are connected in parallel, and the second capacitor and the second resistor are connected in series; the first capacitor and the first resistor are connected in parallel and connected between the anode and the gate of the thyristor; the second capacitor and the second resistor are connected in series and connected between the anode and the cathode of the thyristor; The anodes of the three thyristors are connected to separate input terminals respectively; the cathodes of the three thyristors are connected in series, and two output terminals are arranged on the cathode series circuit of the three thyristors.

[0010] Furthermore, a plurality of heat dissipation grooves are arranged on the end surface of the heat dissipation plate facing the mounting plate; and the plurality of heat dissipation grooves are all connected to the heat dissipation channel.

[0011] Furthermore, the mounting plate is connected to a plurality of support members, and the plurality of support members are connected to the heat sink to support the heat sink.

[0012] Furthermore, a first mounting hole and a second mounting hole are set on the heat sink; the first mounting hole is a U-shaped hole, the second mounting hole is an oblong hole, and a transition hole is set at one end of the oblong hole; the diameter of the transition hole is larger than the diameter of the end of the oblong hole; the heat sink is connected to multiple support members through the first mounting hole and the second mounting hole.

[0013] Furthermore, one side of the heat sink on which the thyristor module is mounted is connected to the protection support plate; and the protection support plate is connected to the protection plate.

[0014] Furthermore, a positioning protrusion is provided at the end of the protective plate; a positioning groove cooperating with the positioning protrusion is provided on the protective support plate, and the positioning protrusion is inserted into the positioning groove to connect the protective plate and the protective support plate.

[0015] Furthermore, the first thyristor module, the second thyristor module and the third thyristor module that have passed reliability verification refer to thyristor modules that have a withstand voltage level higher than a set level and have undergone high-temperature reliability testing, thyristor cabinet-level functional testing and thyristor joint debugging.

[0016] In a second aspect, a nuclear power rod control system is proposed, including a nuclear power rod control system thyristor component proposed in the first aspect.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a thyristor assembly and system for a nuclear power rod control system, wherein the assembly integrates three thyristor modules into one, and the integrated three thyristor modules are installed on a mounting plate and a heat sink, a heat dissipation channel is provided between the heat sink and the mounting plate, the thyristor modules are cooled through the heat dissipation channel, and the three thyristor modules are limited to modules that have passed reliability verification, thereby improving the reliability of the thyristor modules; after the three thyristor modules are integrated, they are connected to an input end and an output end, and when the thyristor assembly is installed and replaced, only the input end, the output end and the mounting plate need to be operated to realize the installation and replacement of the three thyristor modules, thereby improving the installation and replacement efficiency of the thyristor modules.

[0018] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0020] Figure 1 It is an overall schematic diagram of a nuclear power rod control system disclosed in an embodiment; Figure 2 This is a simulation effect diagram of determining the withstand voltage level of a thyristor module in a nuclear power rod control system disclosed in an embodiment; Figure 3 A schematic diagram of the connection structure of a heat sink and a mounting plate in a nuclear power rod control system disclosed in an embodiment; Figure 4 A circuit structure diagram of a nuclear power rod control system disclosed in an embodiment; Figure 5 A circuit schematic diagram of a nuclear power rod control system disclosed in an embodiment; Figure 6 A schematic diagram of the structure of a heat sink in a nuclear power rod control system disclosed in an embodiment; Figure 7 A schematic diagram of the structure of a protective plate in a nuclear power rod control system disclosed in an embodiment; Figure 8 A flow chart for replacing a thyristor assembly in an MG circuit disclosed in an embodiment; Fig. 9 The figure is a flow chart for replacing the thyristor assembly in the SG circuit disclosed in the embodiment.

[0021] Among them: 1. mounting plate, 2. heat sink, 3. protective plate, 4. first thyristor module, 5. second thyristor module, 6. third thyristor module, 7. support, 8. first mounting hole, 9. second mounting hole, 10. protective support plate, 11. protective circuit, 12. bolts. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, modules and / or combinations thereof.

[0025] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0026] Example 1 In this embodiment, a nuclear power rod control system thyristor assembly is disclosed, such as Figure 1-Figure 7 As shown, it includes a mounting plate 1, a heat sink 2, a protection plate 3, and a first thyristor module 4, a second thyristor module 5, and a third thyristor module 6 that have passed reliability verification; The first thyristor module 4, the second thyristor module 5 and the third thyristor module 6 are all connected to the heat sink 2; the heat sink 2 is connected to the mounting plate 1, and a heat dissipation channel is provided between the heat sink 2 and the mounting plate 1; a protective plate 3 is provided on the top of the first thyristor module 4, the second thyristor module 5 and the third thyristor module 6, and the protective plate 3 is connected to the heat sink 2; The anodes of the first thyristor module 4, the second thyristor module 5 and the third thyristor module 6 are connected to the input end, and the cathodes of the first thyristor module 4, the second thyristor module 5 and the third thyristor module 6 are connected to the output end; the input end is used to connect to the power bus in the nuclear power rod control system, and the output end is used to connect to the actuator.

[0027] like Figure 4 , Figure 5 As shown, the first thyristor module 4, the second thyristor module 5 and the third thyristor module 6 all include thyristors and a protection circuit 11; the thyristors are connected to the protection circuit 11; the anodes of the three thyristors are respectively connected to separate input terminals, the three input terminals are A, B, and C, and the three input terminals are respectively used to connect to the three phase lines of the power bus; the cathodes of the three thyristors are connected in series, and two output terminals are set on the cathode series circuit of the three thyristors, and the two output terminals are BUSBAR1 and BUSBAR2.

[0028] Specifically, the protection circuit includes a first capacitor, a second capacitor, a first resistor and a second resistor; the first capacitor and the first resistor are connected in parallel, and the second capacitor and the second resistor are connected in series; the first capacitor and the first resistor are connected in parallel and connected between the anode and the gate of the thyristor; the second capacitor and the second resistor are connected in series and connected between the anode and the cathode of the thyristor.

[0029] The two ends of the parallel circuit of the first capacitor and the first resistor are also connected to the control end respectively, and the thyristor module receives the trigger signal through the control end. Specifically, the control end is used to connect with the trigger signal plug of the trigger module.

[0030] like Figure 3 As shown, the first thyristor module 4 , the second thyristor module 5 and the third thyristor module 6 are arranged in parallel on the heat sink 2 .

[0031] The present embodiment integrates three protection circuits and three thyristors on a mounting board, which is highly integrated, occupies a small space and is easy to replace. When the thyristor module needs to be replaced, it is only necessary to remove and connect the input end, output end and control end of the component with the external circuit and fix them through the mounting board, thereby improving the installation and replacement efficiency. The components disclosed in the present embodiment are highly versatile.

[0032] like Figure 3 As shown, in order to improve the reliability of the thyristor assembly during use, the first thyristor module 4, the second thyristor module 5 and the third thyristor module 6 are all installed on the heat sink 2, a heat dissipation channel is set between the heat sink 2 and the mounting plate 1, and a plurality of heat dissipation grooves are set on the end surface of the heat sink 2 facing the mounting plate 1; the plurality of heat dissipation grooves are all connected to the heat dissipation channel.

[0033] Preferably, the heat sink is made of aluminum alloy.

[0034] The heat dissipation groove is a rectangular groove, which runs through both ends of the heat dissipation plate in the width direction; and a plurality of heat dissipation grooves are evenly distributed along the length direction of the heat dissipation plate.

[0035] In this embodiment, a heat dissipation groove is provided on the heat dissipation plate, thereby increasing the heat dissipation area of ​​the heat dissipation plate, reducing the operating temperature of the thyristor module, and improving the operating reliability of the thyristor module.

[0036] In order to facilitate online replacement of the thyristor module and improve the heat dissipation efficiency, in this embodiment, the mounting plate 1 is connected to a plurality of support members 7 , and the plurality of support members 7 are connected to the heat dissipation plate 2 to support the heat dissipation plate 2 .

[0037] By providing the support member 7, the heat sink is elevated and installed, and a heat dissipation channel is formed between the installation plate 1 and the heat sink 2 to dissipate heat, eliminating the process of applying thermal grease, and the heat dissipation channel facilitates the replacement of the thyristor module on the heat sink.

[0038] Preferably, the mounting plate 1 is connected to four support members 7 , and the four support members 7 are connected to four ends of the heat dissipation plate 3 , so as to support the four ends of the support members 7 .

[0039] like Figure 6 As shown, in order to facilitate the overall replacement of the three thyristor modules by disassembling the heat sink, the present embodiment provides a first mounting hole 8 and a second mounting hole 9 on the heat sink 2; the first mounting hole 8 is a U-shaped hole, the second mounting hole 9 is an oblong hole, and a transition hole is provided at one end of the oblong hole; the diameter of the transition hole is larger than the diameter of the end of the oblong hole; the heat sink 2 is connected to a plurality of support members through the first mounting hole 8 and the second mounting hole 9.

[0040] Preferably, two first mounting holes 8 and two second mounting holes 9 are arranged on the heat sink 2, the two first mounting holes 8 are located on one side of the heat sink 2, and the two first mounting holes 8 are U-shaped holes opened from the side of the heat sink 2 to the inside of the heat sink 2, and the two second mounting holes 9 are located on the other side of the heat sink 2, and the two first mounting holes 8 and the two second mounting holes 9 are connected one by one to the four support members by bolts 12.

[0041] By providing the first mounting hole 8 and the second mounting hole 9, it is convenient to bolt the heat sink to the support member.

[0042] In order to protect personnel during the replacement of the thyristor module, the present embodiment further provides a protective plate 3, which is detachably connected to the heat sink 2. When other electrical equipment needs to be maintained, the protective plate 3 is connected to the heat sink 2. The protective plate 3 covers the three thyristor modules to provide temporary physical protection for the three thyristor modules, thereby preventing the three thyristor modules from affecting the safety of the operators and protecting the personnel.

[0043] Specifically, one side of the heat sink on which the thyristor module is mounted is connected to the protection support plate 10 ; the protection support plate 10 is connected to the protection plate 3 .

[0044] like Figure 6 , Figure 7 As shown, a positioning protrusion is provided at the end of the protective plate 3; a positioning groove cooperating with the positioning protrusion is provided on the protective support plate, and the positioning protrusion is inserted into the positioning groove to connect the protective plate 3 with the protective support plate 10.

[0045] In order to improve the reliability of the thyristor assembly disclosed in this embodiment, in addition to heat dissipation through the heat dissipation plate and the heat dissipation channel, it is also required that the thyristor modules installed on the heat dissipation plate are all thyristor modules that have passed reliability verification.

[0046] The first thyristor module, the second thyristor module and the third thyristor module that have passed reliability verification refer to thyristor modules that have a withstand voltage level higher than a set level and have undergone high-temperature reliability testing, thyristor cabinet-level functional testing and thyristor joint debugging.

[0047] Preferably, the setting level is 1200V; the setting level is determined according to the maximum fault voltage of the circuit when a fault occurs in the circuit where the thyristor module is located.

[0048] like Figure 2 As shown, when the circuit where the thyristor module is located is designed for 260VAC, when an extreme power failure occurs in the circuit where the thyristor module is located, the short-time fault voltage can reach 1.07KV according to the Vp-p consideration. According to the simulation results and compatibility with the 380V system, the withstand voltage level of the thyristor module is increased and the set level is limited to 1200V; the withstand voltage level of the thyristor module installed on the heat sink must be higher than the set level of 1200V.

[0049] In this embodiment, the thyristor modules are preliminarily screened according to the withstand voltage level of the thyristor modules. After obtaining the thyristor modules with a withstand voltage level greater than the set level, the screened thyristor modules are further subjected to high-temperature reliability test, thyristor cabinet-level function test and thyristor joint debugging in sequence; when it is found during the test that the tested thyristor module fails the test, another thyristor module with a withstand voltage level greater than the set level is replaced and the three tests are repeated starting from the high-temperature reliability test. When the three tests performed by the thyristor module are all qualified, the thyristor module is a thyristor module that has passed the reliability verification.

[0050] Among them, the high temperature reliability test refers to connecting the thyristor module to the LC circuit of the power cabinet, and testing the thyristor module under three environmental conditions: low temperature (5°C), normal temperature (25°C), and high temperature (54°C). Before testing in each temperature environment, the thyristor module is left to stand for 20 minutes under the corresponding temperature requirements before being powered on. The test items include the average on-state current, on-state voltage, power, gate trigger current, gate trigger voltage, turn-off time, critical on-state current rise rate, critical on-state voltage rise rate, and temperature rise. If any one of them fails, it means that the high temperature reliability test of the thyristor module has failed.

[0051] The thyristor cabinet-level functional test refers to installing the thyristor module in a test cabinet that simulates the power cabinet of the nuclear power rod control system, and testing the overall performance of the test cabinet, such as rod speed accuracy, single rod mode, step current shape and accuracy, and fixed trigger angle / current, etc. If any of the items fails, it means that the thyristor cabinet-level functional test of the thyristor module fails.

[0052] The thyristor joint test refers to the joint test of the entire rod control system including the drive mechanism after the thyristor module is installed in the power cabinet of the nuclear power rod control system. When the rod control system performance test is qualified, it indicates that the thyristor joint test of the thyristor module is qualified.

[0053] The present embodiment discloses a thyristor assembly for a nuclear power rod control system, which integrates three thyristor modules and installs them on a heat sink, connects the heat sink to a mounting plate, and sets a heat dissipation channel between the heat sink and the mounting plate. The thyristor modules are cooled through the heat dissipation channel, and the three thyristor modules are all modules that have passed reliability verification, thereby improving the reliability of the thyristor modules. After the three thyristor modules are integrated, they are connected to an input end and an output end. When installing and replacing the thyristor assembly, only the input end, the output end and the mounting plate need to be operated to achieve installation and replacement of the three thyristor modules, thereby improving the installation and replacement efficiency of the thyristor modules.

[0054] Example 2 In this embodiment, a nuclear power rod control system is disclosed, including a nuclear power rod control system thyristor component disclosed in Example 1.

[0055] For example, a nuclear power rod control system thyristor assembly disclosed in Example 1 is installed in a power cabinet of a nuclear power rod control system to obtain a nuclear power rod control system.

[0056] Specifically, a nuclear power rod control system thyristor assembly disclosed in Example 1 is installed in the MG circuit, SG circuit and LC circuit of the power cabinet of the nuclear power rod control system respectively.

[0057] When a thyristor component fails, first locate the power cabinet where the failed thyristor component is located; determine the circuit where the failed thyristor component is located.

[0058] After the circuit where the faulty thyristor component is located is determined, the faulty thyristor component is replaced.

[0059] like Figure 8 As shown, when the circuit where the faulty thyristor component is located is the MG circuit, the process of replacing the thyristor component in the MG circuit includes: Step S1, putting the rod control system in manual control state.

[0060] Step S2, connecting the protective plates of the thyristor components in the SG loop and the LG loop to the protective support plates, and sealing and protecting the thyristor components in the SG loop and the LG loop to provide a safe space for personnel operation.

[0061] Step S3, disconnecting the online replacement device isolation disconnecting switch on the upstream AC side of the thyristor assembly in the MG circuit to isolate the faulty thyristor assembly from the upstream power supply.

[0062] Step S4, disconnecting the corresponding fuses at the outlet and inlet ends of the MG coil on the cabinet side to isolate the load end.

[0063] Step S5, after measuring and confirming that the thyristor assembly in the MG circuit is not energized, disconnect the trigger signal plug of the trigger module in the MG circuit from the control end of the thyristor assembly, and disconnect the input end and output end of the thyristor assembly in the MG circuit from the MG circuit.

[0064] Step S6, replace the new thyristor assembly, measure and confirm that the new thyristor assembly has no short circuit. Connect the trigger signal plug of the trigger module in the MG circuit to the control end of the new thyristor assembly, and connect the input and output ends of the new thyristor assembly to the MG circuit.

[0065] Step S7, restoring the corresponding fuses of the MG coil at the outlet and inlet ends of the cabinet.

[0066] Step S8, restoring the online replacement device isolating and disconnecting switch on the upstream AC side of the thyristor assembly of the MG circuit.

[0067] Step S9, removing the protective plates of the thyristor components in the SG circuit and the LG circuit.

[0068] like Fig. 9 As shown, when the circuit where the faulty thyristor component is located is the SG circuit, the process of replacing the thyristor component in the SG circuit includes: Step S1, putting the rod control system in manual control state.

[0069] Step S2, connecting the protective plates of the thyristor components in the MG circuit and the LG circuit to the protective support plate, and covering and protecting the thyristor components in the MG circuit and the LG circuit to provide a safe space for personnel operation.

[0070] Step S3, disconnecting the online replacement device isolation disconnecting switch on the upstream AC side of the thyristor assembly in the SG loop to isolate the faulty thyristor assembly from the upstream power supply.

[0071] Step S4, disconnecting the online replacement device isolation disconnecting device on the downstream DC side of the thyristor assembly in the SG circuit, so that the thyristor assembly in the SG circuit is isolated from the downstream load.

[0072] Step S5, after measuring and confirming that the thyristor component in the SG circuit is not energized, disconnect the trigger signal plug of the trigger module in the SG circuit from the control end of the thyristor component, and disconnect the input end and output end of the thyristor component in the SG circuit from the SG circuit.

[0073] Step S6, replace the new thyristor assembly, measure and confirm that the new thyristor assembly has no short circuit. Connect the trigger signal plug of the trigger module in the SG circuit to the control end of the new thyristor assembly, and connect the input and output ends of the new thyristor assembly to the SG circuit.

[0074] Step S7, restore the isolation and disconnecting device of the online replacement device on the downstream DC side of the thyristor assembly in the SG circuit.

[0075] Step S8, restore the online replacement device isolating and disconnecting switch on the upstream AC side of the SG loop thyristor assembly.

[0076] Step S9, removing the protective plates of the thyristor components in the MG circuit and the LG circuit.

[0077] When the circuit where the faulty thyristor component is located is an LG circuit, the process of replacing the thyristor component in the LG circuit includes: Step S1, putting the rod control system in manual control state.

[0078] Step S2, connecting the protective plates of the thyristor components in the MG circuit and the SG circuit to the protective support plate, and sealing and protecting the thyristor components in the MG circuit and the SG circuit to provide a safe space for personnel operation.

[0079] Step S3, disconnecting the online replacement device isolation disconnecting switch on the upstream AC side of the thyristor assembly in the LG loop to isolate the faulty thyristor assembly from the upstream power supply.

[0080] Step S4, disconnecting the online replacement device isolation disconnecting device on the downstream DC side of the thyristor assembly in the LG circuit, so that the thyristor assembly in the LG circuit is isolated from the downstream load.

[0081] Step S5, after measuring and confirming that the thyristor component in the LG circuit is not energized, disconnect the trigger signal plug of the trigger module in the LG circuit from the control end of the thyristor component, and disconnect the input end and output end of the thyristor component in the LG circuit from the LG circuit.

[0082] Step S6, replace the new thyristor assembly, measure and confirm that the new thyristor assembly has no short circuit, connect the trigger signal plug of the trigger module in the LG circuit to the control end of the new thyristor assembly, and connect the input and output ends of the new thyristor assembly to the LG circuit.

[0083] Step S7, restoring the isolation and disconnecting device of the online replacement device on the downstream DC side of the thyristor assembly in the LG circuit.

[0084] Step S8, restore the online replacement device isolating and disconnecting switch on the upstream AC side of the LG circuit thyristor assembly.

[0085] Step S9, removing the protective plates of the thyristor components in the MG circuit and the SG circuit.

[0086] A nuclear power rod control system disclosed in this embodiment, by adopting a nuclear power rod control system thyristor component disclosed in Example 1, realizes the rapid replacement of thyristor components and the rapid and effective physical shielding of thyristor components that do not need to be replaced, thereby improving the online replacement efficiency and the operation safety.

[0087] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A thyristor assembly for a nuclear power rod control system, characterized in that: It includes a mounting plate, a heat sink, a protection plate, and a first thyristor module, a second thyristor module, and a third thyristor module that have passed reliability verification; The first thyristor module, the second thyristor module and the third thyristor module are all connected to the heat sink; the heat sink is connected to the mounting plate, and a heat dissipation channel is provided between the heat sink and the mounting plate; a protective plate is provided on the top of the first thyristor module, the second thyristor module and the third thyristor module, and the protective plate is connected to the heat sink; The anodes of the first thyristor module, the second thyristor module and the third thyristor module are connected to the input end, and the cathodes of the first thyristor module, the second thyristor module and the third thyristor module are connected to the output end.

2. A nuclear power rod control system thyristor assembly as claimed in claim 1, characterized in that: The first thyristor module, the second thyristor module and the third thyristor module all include thyristors and protection circuits; the thyristors are connected to the protection circuits; the anodes of the thyristors are connected to the input ends, and the cathodes of the thyristors are connected to the output ends.

3. A nuclear power rod control system thyristor assembly as claimed in claim 2, characterized in that: The protection circuit includes a first capacitor, a second capacitor, a first resistor, and a second resistor; the first capacitor and the first resistor are connected in parallel, and the second capacitor and the second resistor are connected in series; the first capacitor and the first resistor are connected in parallel and connected between the anode and the gate of the thyristor; the second capacitor and the second resistor are connected in series and connected between the anode and the cathode of the thyristor; The anodes of the three thyristors are connected to separate input terminals respectively; the cathodes of the three thyristors are connected in series, and two output terminals are arranged on the cathode series circuit of the three thyristors.

4. A nuclear power rod control system thyristor assembly as claimed in claim 1, characterized in that: A plurality of heat dissipation grooves are arranged on the end surface of the heat dissipation plate facing the mounting plate; and the plurality of heat dissipation grooves are all communicated with the heat dissipation channel.

5. A nuclear power rod control system thyristor assembly as claimed in claim 1, characterized in that: The mounting plate is connected to a plurality of supporting members, and the plurality of supporting members are connected to the heat sink to support the heat sink.

6. A nuclear power rod control system thyristor assembly as claimed in claim 5, characterized in that: A first mounting hole and a second mounting hole are arranged on the heat dissipation plate; the first mounting hole is a U-shaped hole, the second mounting hole is an oblong hole, and a transition hole is arranged at one end of the oblong hole; the diameter of the transition hole is larger than the diameter of the end of the oblong hole; the heat dissipation plate is connected to a plurality of support members through the first mounting hole and the second mounting hole.

7. A nuclear power rod control system thyristor assembly as claimed in claim 1, characterized in that: The side of the heat sink on which the thyristor module is mounted is connected to the protection support plate; the protection support plate is connected to the protection plate.

8. A nuclear power rod control system thyristor assembly as claimed in claim 7, characterized in that: A positioning protrusion is arranged at the end of the protective plate; a positioning groove matched with the positioning protrusion is arranged on the protective support plate, and the positioning protrusion is inserted into the positioning groove to connect the protective plate with the protective support plate.

9. A nuclear power rod control system thyristor assembly as claimed in claim 1, characterized in that: The first thyristor module, the second thyristor module and the third thyristor module that have passed reliability verification refer to thyristor modules that have a withstand voltage level higher than a set level and have undergone high-temperature reliability testing, thyristor cabinet-level functional testing and thyristor joint debugging.

10. A nuclear power rod control system, characterized in that: A thyristor assembly for a nuclear power rod control system comprising any one of claims 1-9.

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