A system and method for testing the electrical performance attenuation of high-power thyristors under neutron irradiation

Abstract

The present invention relates to the technical field of thyristor operation reliability analysis, and in particular to a system and method for testing the electrical performance attenuation of a high-power thyristor under neutron irradiation. The technical scheme includes an irradiation zone subsystem in a heavy lead shielding body and a test zone subsystem outside the heavy lead shielding body, wherein the irradiation zone subsystem is provided with an artificial neutron source, a stepped sample test rack, a current limiting resistor and a sampling resistor connected to ground, and the stepped sample test rack is respectively provided with a thyristor group 1, a thyristor group 2 and a thyristor group 3, wherein the thyristor group 1, the thyristor group 2 and the thyristor group 3 are composed of four tested high-power thyristors distributed in a ring shape with the artificial neutron source as the center. The present invention realizes real-time online monitoring of the electrical performance attenuation of a high-power thyristor under neutron irradiation, and can realize synchronous testing of the electrical performance attenuation of a high-power thyristor caused by different neutron injections, with high testing efficiency and low testing cost.

Description

Technical Field

[0001] The invention relates to the technical field of thyristor operation reliability analysis, and in particular to a system and method for testing electrical performance attenuation of a high-power thyristor under neutron irradiation. Background Art

[0002] Compared with other power semiconductor devices, high-power thyristors have the advantages of high electrical performance, simple control and low cost. They have been widely used in power systems, industrial equipment, and large scientific devices, and have undertaken important tasks such as power transmission and power conversion. However, in some special application environments, such as tokamak magnetic confinement fusion devices and flexible DC transmission projects in high-altitude areas, high-power thyristors will suffer damage from fusion neutrons or atmospheric neutrons, causing electrical performance degradation. The reliability is greatly reduced, which seriously threatens the application of power transmission and transformation equipment and even the overall operation safety of the device, causing immeasurable economic losses and social impacts. Therefore, it is very important to accurately test the electrical performance degradation of high-power thyristors under neutron irradiation.

[0003] At present, there is no test system and method for the electrical performance degradation of high-power thyristors under neutron irradiation. The test method for the electrical performance degradation of other power devices under neutron irradiation still adopts the offline test method, which cannot monitor the changes in the electrical parameters of the devices online. At the same time, due to the singleness of the artificial neutron source injection rate, it is impossible to achieve synchronous testing of the electrical performance degradation of devices under multiple neutron injection rates, resulting in low test efficiency and extremely high test costs.

[0004] In summary, the present application proposes a system and method for testing the electrical performance attenuation of high-power thyristors under neutron irradiation. Summary of the invention

[0005] The purpose of the present invention is to propose a system and method for testing the electrical performance attenuation of high-power thyristors under neutron irradiation, aiming at the low test efficiency and extremely high test cost of synchronous testing of the electrical performance attenuation of devices under multiple neutron injections in the background technology.

[0006] The technical solution of the present invention is: a high-power thyristor electrical performance attenuation test system under neutron irradiation, comprising an irradiation area subsystem in a heavy lead shielding body and a test area subsystem outside the heavy lead shielding body, wherein an artificial neutron source, a stepped sample test rack, a current limiting resistor and a sampling resistor connected to ground are arranged in the irradiation area subsystem, and the stepped sample test rack is electrically connected to the current limiting resistor and the sampling resistor respectively;

[0007] The step-type sample test rack is respectively equipped with a thyristor group 1, a thyristor group 2 and a thyristor group 3, each of which is composed of four high-power thyristors to be tested and distributed in a ring shape with an artificial neutron source as the center;

[0008] The test area subsystem includes a voltage dividing resistor connected to ground, a high voltage DC power supply, a working condition machine and an oscilloscope;

[0009] The voltage-dividing resistor is connected to the high-power thyristor under test and the sampling resistor respectively through wires. The voltage-dividing resistor is composed of two resistors connected. The two resistors are connected to an oscilloscope through a voltage probe. The high-voltage DC power supply is electrically connected to the current-limiting resistor. The high-voltage DC power supply is grounded and electrically connected to the working machine.

[0010] Optionally, the artificial neutron source is composed of a neutron generating device and a neutron output column, the body of the neutron output column is cylindrical, and the end of the neutron output column is spherical.

[0011] Optionally, the distance ratio between the high-power thyristors under test in the thyristor group 1, the thyristor group 2 and the thyristor group 3 and the artificial neutron source is 1:2:3.

[0012] Optionally, thyristor group one, thyristor group two and thyristor group three include two sub-control groups, one with the cathode facing the end of the artificial neutron source and the other with the anode facing the end of the artificial neutron source, and each sub-control group includes two high-power thyristors under test.

[0013] Optionally, the high voltage DC power supply is connected to the current limiting resistor through a hole through the heavy lead shielding body.

[0014] Optionally, the working machine is connected to the high-voltage DC power supply via a control signal.

[0015] Optionally, the high voltage DC power supply is grounded.

[0016] On the other hand, the present application provides a method for testing the electrical performance degradation of a high-power thyristor under neutron irradiation, which is applied to the above-mentioned system for testing the electrical performance degradation of a high-power thyristor under neutron irradiation, and comprises the following steps:

[0017] S1. In the irradiation zone subsystem, placing an artificial neutron source at the center of the stepped sample test rack;

[0018] S2. Place twelve high-power thyristors to be tested on the stepped sample test rack and install them, and divide them into three groups according to the distance from the end of the artificial neutron source of 1:2:3, each group includes two sub-control groups, one with the cathode facing the end of the artificial neutron source and the other with the anode facing the end of the artificial neutron source, and each sub-control group includes two high-power thyristors to be tested;

[0019] S3, connecting the high-power thyristors under test in all sub-control groups to the current limiting resistor and the sampling resistor according to forward bias and reverse bias, and completing the connection of other component equipment of the high-power thyristor electrical performance attenuation test system under neutron irradiation, the current limiting resistor is used to reduce the current after mis-conduction caused by the electrical performance degradation of the high-power thyristor under test, so as to realize overcurrent protection of the high-power thyristor under test;

[0020] S4, turn on the artificial neutron source, start the irradiation test, and the high-voltage DC power supply supplies power to the high-power thyristors under test;

[0021] S5. Use the working condition machine to control the voltage output size, and use the sampling resistor, voltage dividing resistor, and oscilloscope to collect the voltage and current changes of the high-power thyristor under test in real time;

[0022] S6. Analyze and understand the electrical performance attenuation characteristics.

[0023] Compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0024] The present invention separates the irradiation area subsystem from the test area subsystem, and uses a sampling resistor, a working condition machine, a high-voltage DC power supply, and an oscilloscope to achieve real-time online monitoring of the electrical performance degradation of high-power thyristors under neutron irradiation. Further, the stepped sample test rack is designed to group the tested high-power thyristors at different distances from the end of the artificial neutron source to receive neutron irradiation under different neutron injections, which can achieve synchronous testing of the electrical performance degradation of high-power thyristors caused by different neutron injections, with high test efficiency and low test cost.

[0025] The present invention realizes real-time online monitoring of the electrical performance attenuation of a high-power thyristor under neutron irradiation, and can realize synchronous testing of the electrical performance attenuation of the high-power thyristor caused by different neutron injections, with high testing efficiency and low testing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A structural schematic diagram of a high-power thyristor electrical performance degradation test system under neutron irradiation is given;

[0027] Figure 2 It is a schematic diagram of the structure of a stepped sample test rack;

[0028] Figure 3 The present invention is a flow chart of a method for testing the electrical performance attenuation of high-power thyristors under neutron irradiation.

[0029] Figure numerals: 1. irradiation zone subsystem; 2. test zone subsystem; 3. artificial neutron source; 4. neutron generating equipment; 5. neutron output column; 6. current limiting resistor; 7. high-power thyristor under test; 8. stepped sample test rack; 9. sampling resistor; 10. working condition machine; 11. voltage dividing resistor; 12. high-voltage DC power supply; 13. oscilloscope; 14. fixture. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figure 1 As shown, a system for testing the electrical performance attenuation of a high-power thyristor under neutron irradiation proposed by the present invention comprises an irradiation area subsystem 1 located inside a heavy lead shielding body and a test area subsystem 2 located outside the heavy lead shielding body.

[0033] In this embodiment, an artificial neutron source 3, a stepped sample test rack 8, a current limiting resistor 6 and a sampling resistor 9 connected to ground are provided in the irradiation zone subsystem 1, and the stepped sample test rack 8 is electrically connected to the current limiting resistor 6 and the sampling resistor 9 respectively; the artificial neutron source 3 is composed of a neutron generating device 4 and a neutron output column 5, the body of the neutron output column is cylindrical, and the end of the neutron output column is spherical.

[0034] like Figure 2 As shown, the stepped sample test rack 8 is respectively equipped with thyristor group 1, thyristor group 2 and thyristor group 3, each of which is composed of four high-power thyristors 7 to be tested and distributed in a ring shape with the artificial neutron source 3 as the center; there are a total of twelve high-power thyristors 7 to be tested, Figure 2 Parts are omitted and not shown. The distance ratio between the high-power thyristors 7 under test in thyristor group 1, thyristor group 2 and thyristor group 3 and the artificial neutron source 3 is 1:2:3; thyristor group 1, thyristor group 2 and thyristor group 3 include two sub-control groups, one with the cathode facing the end of the artificial neutron source and the other with the anode facing the end of the artificial neutron source, and each sub-control group includes two high-power thyristors 7 under test. A plurality of clamps 14 are provided on the stepped sample test frame 8, and the high-power thyristors 7 under test are clamped on the clamps 14 for installation. In this embodiment, the distance between the high-power thyristors 7 under test in thyristor group 1, thyristor group 2 and thyristor group 3 and the artificial neutron source 3 is 20 cm, 40 cm and 60 cm respectively.

[0035] The test area subsystem 2 includes a voltage-dividing resistor 11 connected to ground, a high-voltage DC power supply 12, a working condition machine 10 and an oscilloscope 13. The working condition machine 10 is connected to the high-voltage DC power supply 12 through a control signal, and the high-voltage DC power supply 12 is grounded.

[0036] In addition, the voltage-dividing resistor 11 is connected to the high-power thyristor 7 and the sampling resistor 9 under test respectively through wires. The voltage-dividing resistor 11 is composed of two resistors connected, and the two resistors are connected to the oscilloscope 13 through a voltage probe. The high-voltage DC power supply 12 is electrically connected to the current-limiting resistor 6. The high-voltage DC power supply 12 is grounded and electrically connected to the working machine 10. The high-voltage DC power supply 12 passes through the heavy lead shielding body through a hole and is connected to the current-limiting resistor 6.

[0037] The present invention separates the irradiation area subsystem 1 and the test area subsystem 2, and utilizes the sampling resistor 9, the working condition machine 10, the high-voltage direct current power supply 12, and the oscilloscope 13 to realize the real-time online monitoring of the electrical performance attenuation of the tested high-power thyristor 7 under neutron irradiation. In addition, the design of the stepped sample test rack 8 groups the tested high-power thyristors 7 at different distances from the end of the artificial neutron source 3 to receive neutron irradiation under different neutron injections, and can realize the synchronous test of the electrical performance attenuation of the tested high-power thyristor 7 caused by different neutron injections, with high test efficiency and low test cost.

[0038] Example 2

[0039] like Figure 3 As shown, this embodiment 1 provides a method for testing the electrical performance attenuation of a high-power thyristor under neutron irradiation, which is applied to the electrical performance attenuation testing system of a high-power thyristor under neutron irradiation described in embodiment 1, and includes the following steps:

[0040] S1. In the irradiation zone subsystem 1, the artificial neutron source 3 is placed at the center of the stepped sample test rack 8;

[0041] S2, placing twelve high-power thyristors 7 under test on the stepped sample test rack 8 and installing them, and dividing them into three groups according to the distance of 1:2:3 from the end of the artificial neutron source 3, each group including two sub-control groups, one with the cathode facing the end of the artificial neutron source and the other with the anode facing the end of the artificial neutron source, and each sub-control group including two high-power thyristors 7 under test;

[0042] S3, connecting the high-power thyristors 7 under test in all sub-control groups to the current limiting resistor 6 and the sampling resistor 9 according to forward bias and reverse bias, and completing the connection of other component equipment of the high-power thyristor 7 electrical performance attenuation test system under neutron irradiation, the current limiting resistor 6 is used to reduce the current after mis-conduction caused by electrical performance degradation of the high-power thyristor 7 under test, so as to realize overcurrent protection of the high-power thyristor 7 under test;

[0043] S4, turning on the artificial neutron source 3, starting the irradiation test, and the high-voltage DC power supply 12 supplies power to the high-power thyristor 7 under test;

[0044] S5, using the working condition machine 10 to control the voltage output size, and using the sampling resistor 6, the voltage dividing resistor 11, and the oscilloscope 13 to collect the voltage and current changes of the high-power thyristor 7 under test in real time;

[0045] S6. Analyze and understand the electrical performance attenuation characteristics.

[0046] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A high-power thyristor electrical performance attenuation test system under neutron irradiation, comprising an irradiation area subsystem in a heavy lead shielding body and a test area subsystem outside the heavy lead shielding body, characterized in that: The irradiation zone subsystem is provided with an artificial neutron source, a stepped sample test rack, a current limiting resistor and a sampling resistor, and the stepped sample test rack is electrically connected to the current limiting resistor and the sampling resistor respectively; The step-type sample test rack is respectively equipped with a thyristor group 1, a thyristor group 2 and a thyristor group 3, each of which is composed of four high-power thyristors to be tested and distributed in a ring shape with an artificial neutron source as the center; The test area subsystem includes a voltage-dividing resistor, a high-voltage DC power supply, a working condition machine and an oscilloscope. The voltage-dividing resistor is respectively connected to the high-power thyristor under test and the sampling resistor. The voltage-dividing resistor is composed of two resistors connected, and the two resistors are connected to the oscilloscope through a voltage probe. The high-voltage DC power supply is connected to the current-limiting resistor.

2. A high-power thyristor electrical performance attenuation test system under neutron irradiation according to claim 1, characterized in that: The artificial neutron source is composed of a neutron generating device and a neutron output column. The body of the neutron output column is cylindrical, and the end of the neutron output column is spherical.

3. A high-power thyristor electrical performance attenuation test system under neutron irradiation according to claim 1, characterized in that: The distance ratio between the high-power thyristors to be tested and the artificial neutron source in the thyristor group 1, the thyristor group 2 and the thyristor group 3 is 1:2:

3.

4. A high-power thyristor electrical performance attenuation test system under neutron irradiation according to claim 1, characterized in that: The thyristor group 1, the thyristor group 2 and the thyristor group 3 include two sub-control groups, one with the cathode facing the end of the artificial neutron source and the other with the anode facing the end of the artificial neutron source, and each sub-control group includes two high-power thyristors to be tested.

5. The high-power thyristor electrical performance attenuation test system under neutron irradiation according to claim 1 is characterized in that: The high voltage DC power supply is connected to the current limiting resistor through the hole through the heavy lead shielding body.

6. A high-power thyristor electrical performance attenuation test system under neutron irradiation according to claim 1, characterized in that: The working machine is connected to the high voltage DC power supply via a control signal.

7. A high-power thyristor electrical performance attenuation test system under neutron irradiation according to claim 6, characterized in that: The high voltage DC power supply is grounded and electrically connected to the working state.

8. A method for testing the electrical performance attenuation of a high-power thyristor under neutron irradiation, applied to the electrical performance attenuation testing system of a high-power thyristor under neutron irradiation as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. In the irradiation zone subsystem, placing an artificial neutron source at the center of the stepped sample test rack; S2. Place twelve high-power thyristors to be tested on the stepped sample test rack and install them, and divide them into three groups according to the distance from the end of the artificial neutron source of 1:2:3, each group includes two sub-control groups, one with the cathode facing the end of the artificial neutron source and the other with the anode facing the end of the artificial neutron source, and each sub-control group includes two high-power thyristors to be tested; S3, connecting the high-power thyristors under test in all sub-control groups to the current limiting resistor and the sampling resistor according to forward bias and reverse bias, and completing the connection of other component equipment of the high-power thyristor electrical performance attenuation test system under neutron irradiation, the current limiting resistor is used to reduce the current after mis-conduction caused by the electrical performance degradation of the high-power thyristor under test, so as to realize overcurrent protection of the high-power thyristor under test; S4, turn on the artificial neutron source, start the irradiation test, and the high-voltage DC power supply supplies power to the high-power thyristors under test; S5. Use the working condition machine to control the voltage output size, and use the sampling resistor, voltage dividing resistor, and oscilloscope to collect the voltage and current changes of the high-power thyristor under test in real time; S6. Analyze and understand the electrical performance attenuation characteristics.

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