Qualification test methods for glass-to-metal sealed electrical penetrations

Abstract

The present invention discloses an identification test method applicable to glass-metal sealed electrical penetrations, comprising the following steps: 1) making a short sample of a feedthrough assembly, and conducting a pilot test on the short sample of the feedthrough assembly; 2) making a plurality of feedthrough assembly, and loading them into a cylinder and a junction box, obtaining a glass-metal sealed electrical penetration, and conducting an environmental identification test; 3) conducting a high temperature performance verification test on the glass-metal sealed electrical penetration that passes the environmental identification test of step 2); 4) drawing a conclusion of the identification test based on the results of the pilot test, the environmental identification test, and the high temperature performance verification test. The identification test method applicable to glass-metal sealed electrical penetrations of the present invention can ensure the safety of glass-metal sealed electrical penetrations in nuclear power plants during their service life, and provides great convenience for the subsequent mass production and quality certification of glass-metal sealed electrical penetrations.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental identification of electrical instrumentation equipment in nuclear power plants, and in particular relates to an identification test method suitable for glass-metal sealed electrical penetrations. Background Art

[0002] Glass-to-metal sealed electrical penetrations are special electrical equipment installed on the reactor containment for cables to pass through the containment. Under normal and various accident conditions, glass-to-metal sealed electrical penetrations should be able to ensure the integrity of the containment, prevent the leakage of radioactive materials, and maintain the continuity of electricity and signals in the containment.

[0003] Traditional electrical penetrations use organic materials to achieve the sealing function inside the feedthrough assembly. Due to the inherent characteristics of organic materials, aging phenomena such as embrittlement and creep are inevitable during long-term operation and life extension operation. After aging during operation, if high temperature, high pressure, high humidity and high radiation accidents occur, there is a risk of losing the sealing and insulation functions. Glass-metal sealed electrical penetrations, on the other hand, are inorganic non-metallic materials and are not easily affected by the surrounding environmental conditions and ageing and deteriorating. Therefore, they can well avoid aging problems caused by long-term operation and life extension operation.

[0004] The identification test method of traditional organic material sealed electrical penetrations is relatively fixed. Glass-to-metal sealed electrical penetrations change the material composition, connection method and sealing performance of the original organic material sealed electrical penetrations. In addition, the test method for glass-to-metal sealed electrical penetrations is not yet clear. Therefore, an identification test method suitable for glass-to-metal sealed electrical penetrations is proposed. Summary of the invention

[0005] In view of this, in order to achieve the above-mentioned purpose, the present invention provides an identification test method applicable to glass-to-metal sealed electrical penetrations, which can ensure the safe use of glass-to-metal sealed electrical penetrations in nuclear power plants within their effective service life.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] 1) Make a short sample of the feedthrough assembly and conduct a pilot test on the short sample of the feedthrough assembly;

[0008] 2) manufacturing a plurality of feed-through line assemblies and installing them into a cylinder and a junction box to obtain a glass-to-metal sealed electrical penetration and performing an environmental identification test on the glass-to-metal sealed electrical penetration;

[0009] 3) Conducting a high temperature resistance performance verification test on the glass-to-metal sealed electrical penetration that has passed the environmental identification test in step 2);

[0010] 4) Based on the results of the pilot test, environmental identification test and high temperature performance verification test, draw conclusions on the identification test of glass-to-metal sealed electrical penetrations;

[0011] The pilot test described in step 1) includes a parallel test and a serial test; the length of the feed-through line assembly is greater than the length of the short sample of the feed-through line assembly.

[0012] Specifically, the feedthrough assembly in the above step 2) is additionally equipped with corresponding cylinders, junction boxes and other components to form a complete glass-to-metal sealed electrical penetration for testing. The pilot test using a short sample of the feedthrough assembly in step 1) is to facilitate the accurate test conditions in advance, and the length of the short sample of the feedthrough assembly is shorter than that of the feedthrough assembly, which can effectively save the test cost.

[0013] According to some preferred implementation aspects of the present invention, the method of parallel testing in step 1) is: select n short samples of the feedthrough line assemblies, and perform performance tests on all of them; then divide the n short samples of the feedthrough line assemblies into at least 5 groups on average, and carry out thermal working cycle simulation tests, thermal aging tests, radiation aging tests, seismic tests, and accident condition simulation tests in parallel, and take the short samples of the feedthrough line assemblies that pass the corresponding tests in each group of tests and perform performance tests on them again.

[0014] Specifically, the principle of heat aging test is based on the following formula:

[0015]

[0016] Among them, A is the unknown constant; t is the aging time; E a is the activation energy of the material, in eV; R is the gas constant, in J / (K·mol). It should be noted that the activation energy of the glass material used in the glass-to-metal sealing process is usually 0.8 eV.

[0017] According to some preferred implementation aspects of the present invention, the n short samples of the feed-through line assembly include n / 2 short samples of single-core feed-through line assembly and n / 2 short samples of multi-core feed-through line assembly, and each group of the short samples of the feed-through line assembly includes n / 10 short samples of single-core feed-through line assembly and n / 10 short samples of multi-core feed-through line assembly. In some embodiments of the present invention, the total number of short samples of the feed-through line assembly includes the same number of short samples of single-core feed-through line assembly and short samples of multi-core feed-through line assembly, and the short samples of the feed-through line assembly in each group of tests also include the same number of short samples of single-core feed-through line assembly and short samples of multi-core feed-through line assembly, which is conducive to ensuring that the probability of passing each parallel test is the same.

[0018] According to some preferred implementation aspects of the present invention, the value of n is a natural number greater than or equal to 20, and n / 2 and n / 10 are both positive integers.

[0019] According to some preferred implementation aspects of the present invention, the method of serial testing in step 1) is: the method of serial testing in step 1) is: m short samples of the feed-through line assemblies are selected, all of which are subjected to performance tests, and then each short sample of the feed-through line assembly is subjected to a thermal working cycle simulation test, a thermal aging test, a radiation aging test, a seismic test, and an accident condition simulation test in turn, and finally the m short samples of the feed-through line assemblies are subjected to performance tests again.

[0020] According to some preferred implementation aspects of the present invention, the m short samples of feed-through line assemblies include m / 2 short samples of single-core feed-through line assemblies and m / 2 short samples of multi-core feed-through line assemblies.

[0021] According to some preferred implementation aspects of the present invention, the value of m is a natural number greater than or equal to 10, and m / 2 is a positive integer.

[0022] According to some preferred embodiments of the present invention, the method for drawing a conclusion on the identification test of the glass-to-metal sealed electrical penetration is: when the gas leakage rate of the glass-to-metal sealed electrical penetration is less than or equal to 1×10 -10 Pam 3 / s, dielectric strength greater than or equal to 2kV, insulation resistance greater than or equal to 5×10 9 Ω, when the electrical continuity of the conductor is continuous, the glass-to-metal sealed electrical penetration passes the identification test, otherwise it fails the identification test.

[0023] According to some preferred implementation aspects of the present invention, the environmental identification test described in step 2) includes performance test, air pressure test, pretreatment test, temperature rise test, short circuit test, seismic test, partial discharge test, accident condition simulation test, and short circuit test under accident conditions. Specifically, the temperature rise test mainly verifies the heat generation of the glass-metal sealed electrical penetration under rated conditions; the high temperature resistance performance verification test mainly verifies the performance of glass as a sealing insulating material in a high temperature environment (250°C).

[0024] According to some preferred implementation aspects of the present invention, the performance test includes a gas leakage rate test, a dielectric strength test, an insulation resistance test, and a conductor electrical continuity test; the pretreatment test includes a transportation and storage simulation test, a thermal work cycle simulation test, a heat aging test, and an irradiation aging test. The cumulative irradiation dose in the irradiation aging test is at least 1072.5 kGy.

[0025] Due to the adoption of the above technical scheme, compared with the prior art, the benefits of the present invention are as follows: the identification test method applicable to glass-metal sealed electrical penetrations of the present invention provides a complete, detailed and logically clear technical route for solving the identification test method of glass-metal sealed electrical penetrations in nuclear power plants, which can ensure the safety of glass-metal sealed electrical penetrations in nuclear power plants during their service life, and at the same time provides great convenience for the subsequent mass production and quality certification of glass-metal sealed electrical penetrations, has a good reference value, and lays a foundation for the early realization of mass production and on-site application of glass-metal sealed electrical penetrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic flow chart of an identification test method applicable to glass-to-metal sealed electrical penetrations in an embodiment of the present invention;

[0028] Figure 2 It is a flow chart of parallel tests in an identification test method applicable to glass-to-metal sealed electrical penetrations in an embodiment of the present invention;

[0029] Figure 3 It is a flow chart of a serial test in an identification test method applicable to glass-to-metal sealed electrical penetrations in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] Reference Figures 1 to 3 Taking a glass-metal sealed electrical penetration as an example, the technical solution of the present invention is described in detail:

[0032] The identification test method applicable to the glass-to-metal sealed electrical penetration of this embodiment specifically includes the following steps:

[0033] Step 1) making a short sample of a feedthrough line assembly, and conducting a pilot test on the short sample of the feedthrough line assembly;

[0034] 1.1) First, 30 short samples of feedthrough line assemblies were produced. The specific technical parameters are shown in Table 1.

[0035] Table 1 Technical parameters of 30-wire feedthrough cable assembly short sample

[0036]

[0037]

[0038] Among them, the short samples of feeder line assemblies No. 1 to No. 15 in Table 1 are short samples of multi-core feeder line assemblies, and the short samples of feeder line assemblies No. 16 to No. 30 are short samples of single-core feeder line assemblies.

[0039] 1.2) Conduct parallel tests on the short samples of feeder line assemblies numbered 1 to 10 and 16 to 25: first conduct performance tests on these 20 short samples of feeder line assemblies; then conduct thermal working cycle simulation tests on the short samples of feeder line assemblies numbered 1, 2, 16, and 17, thermal aging tests on the short samples of feeder line assemblies numbered 3, 4, 18, and 19, radiation aging tests on the short samples of feeder line assemblies numbered 5, 6, 20, and 21, seismic tests on the short samples of feeder line assemblies numbered 7, 8, 22, and 23, and seismic tests on the short samples of feeder line assemblies numbered 9, 10, and 24. , 25 are subjected to accident condition simulation tests; finally, the short samples of feeder line assemblies that pass the corresponding test in each group of tests are taken for performance test again; serial tests are carried out on the short samples of feeder line assemblies numbered 11 to 15 and 26 to 30: first, performance tests are carried out on these 10 short samples of feeder line assemblies; then, thermal working cycle simulation tests, thermal aging tests, radiation aging tests, seismic tests and accident condition simulation tests are carried out on each short sample of feeder line assemblies in turn, and finally, performance tests are carried out on these 10 short samples of feeder line assemblies again.

[0040] The above performance tests include gas leakage rate test, dielectric strength test, insulation resistance test and conductor electrical continuity test; during the parallel test and serial test, the specific technical indicators of the 30 short samples of feedthrough line assemblies in the performance test must meet the requirements of Table 2 below.

[0041] Table 2 Technical index requirements for the short sample of 30 feedthrough line assemblies in performance tests

[0042]

[0043] 2) Produce a plurality of feed-through line assemblies and install them into a cylinder and a junction box to obtain a glass-to-metal sealed electrical penetration and perform an environmental identification test on the glass-to-metal sealed electrical penetration.

[0044] After the above-mentioned short sample of the feedthrough line assembly passes the parallel test and the serial test, 10 feedthrough line assemblies are first produced with reference to the test parameters of the short sample of the feedthrough line assembly. The specific technical parameters thereof are shown in Table 3; and they are installed in the cylinder and the junction box to form a complete glass-metal sealed electrical penetration (identification prototype).

[0045] Table 3 Technical parameters of 10 feedthrough line components

[0046] Serial number Wire Gauge Number of conductors type length Remark 1 16AWG 37 Low pressure control 180cm Glass-to-metal seal 2 16AWG 37 Low pressure control 180cm Glass-to-metal seal 3 16AWG 37 Low pressure control 180cm Glass-to-metal seal 4 500MCM 1 Low voltage power 180cm Glass-to-metal seal 5 500MCM 1 Low voltage power 180cm Glass-to-metal seal 6 500MCM 1 Low voltage power 180cm Glass-to-metal seal 7 500MCM 1 Low voltage power 180cm Glass-to-metal seal 8 500MCM 1 Low voltage power 180cm Glass-to-metal seal 9 500MCM 1 Low voltage power 180cm Glass-to-metal seal 10 500MCM 1 Low voltage power 180cm Glass-to-metal seal

[0047] Among them, feed-through line assemblies No. 1 to No. 3 in Table 3 are multi-core feed-through line assemblies, and feed-through line assemblies No. 4 to No. 10 are single-core feed-through line assemblies.

[0048] 2.1) For complete glass-to-metal sealed electrical penetrations, the results of performance tests and air pressure tests shall meet the requirements in Table 4, which means that the performance test has been passed.

[0049] Table 4 Technical index requirements for 10 feedthrough wire assemblies and glass-metal sealed electrical penetrations in performance tests

[0050]

[0051] 2.2) Carry out pretreatment tests for complete glass-to-metal sealed electrical penetrations, including transportation and storage simulation tests, thermal working cycle simulation tests, thermal aging tests, and radiation aging tests;

[0052] Among them, the principle of thermal aging test is based on the following formula:

[0053]

[0054] Among them, A is the unknown constant; t is the aging time; E a is the activation energy of the material, in eV; R is the gas constant, in J / (K·mol). It should be noted that the activation energy of the glass material used in the glass-to-metal sealing process is usually 0.8eV. According to the above formula, the corresponding aging temperature and thermal aging time can be determined, as shown in Table 5.

[0055] Table 5 Detailed parameters of thermal aging test

[0056]

[0057] In addition, the radiation aging test parameter requirements in this embodiment are detailed in Table 6. Considering the actual test conditions, the glass-to-metal sealed electrical penetration is placed in the radiation aging test. 60In the Co source irradiation field, the dose rate is set at 1±0.5kGy / h, and the total cumulative dose is set at 1072.5kGy (taking into account the cumulative dose of 375kGy under normal service conditions for 60 years and the cumulative dose of 600kGy under design basis accident conditions, while taking into account the identification margin of +10%).

[0058] Table 6 Detailed parameters of radiation aging test

[0059]

[0060] 2.3) Carry out temperature rise test on complete glass-to-metal sealed electrical penetrations, where the glass-to-metal sealed electrical penetrations (500MCM) for low-voltage power are subjected to a rated current of 315A, and the glass-to-metal sealed electrical penetrations (16AWG) for low-voltage control are subjected to a rated current of 3.4A.

[0061] 2.4) For the complete glass-to-metal sealed electrical penetrations, a short-circuit test is carried out, and after the short-circuit test, some performance tests are carried out to verify it, mainly including gas leakage rate test, dielectric strength test and conductor electrical continuity test.

[0062] 2.5) For complete glass-to-metal sealed electrical penetrations, conduct seismic tests, accident simulation tests and electrical performance tests under accident conditions.

[0063] 2.6) Carry out final performance tests on complete glass-to-metal sealed electrical penetrations, including gas leakage rate test, dielectric strength test, insulation resistance test and conductor electrical continuity test.

[0064] 3) The glass-to-metal sealed electrical penetrations that have passed the environmental identification test in step 2) are subjected to a high temperature resistance performance verification test. Detailed parameters of the high temperature resistance performance verification test are shown in Table 7.

[0065] Table 7 Detailed parameters of high temperature resistance performance verification test

[0066] Test subjects Test temperature (℃) Test time (h) Complete Machine 250 24

[0067] In this embodiment, after the high temperature resistance performance verification test is completed, it is necessary to further carry out performance tests, including a gas leakage rate test, a dielectric strength test, an insulation resistance test, and a conductor electrical continuity test.

[0068] 4) Based on the results of the pilot test, environmental identification test and high temperature performance verification test, the conclusion of the identification test of the glass-to-metal sealed electrical penetration is obtained. The identification results of the feedthrough assembly subjected to the identification test in this embodiment are shown in Table 8. According to Table 4, the requirements for the feedthrough assembly to pass the identification test (gas leakage rate less than or equal to 1×10 -11 Pam3 / s, dielectric strength greater than or equal to 2kV, insulation resistance greater than or equal to 5×10 9 Ω, the electrical continuity of the conductor is continuous) is more stringent than the requirements for complete glass-to-metal sealed electrical penetrations. When the feed-through assembly meets the requirements of the identification test, the corresponding glass-to-metal sealed electrical penetration meets the requirements.

[0069] Table 8 Identification results of No. 1 to No. 10 feed-through line assemblies in this embodiment

[0070]

[0071]

[0072] As shown in Table 8, the test results of the 10 feedthrough line assemblies of this embodiment in the final performance test meet the requirements of Table 4, so the corresponding glass-to-metal sealed electrical penetrations assembled therefrom also pass the identification test.

[0073] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A test method for identifying glass-to-metal sealed electrical penetrations, characterized in that: The steps include: 1) Make a short sample of the feedthrough assembly and conduct a pilot test on the short sample of the feedthrough assembly; 2) manufacturing a plurality of feedthrough line assemblies and installing them into a cylinder and a junction box to obtain a glass-to-metal sealed electrical penetration and performing an environmental identification test on the glass-to-metal sealed electrical penetration; 3) Conduct high temperature resistance verification test on the glass-to-metal sealed electrical penetrations that have passed the environmental identification test in step 2); 4) Based on the results of the pilot test, environmental identification test and high temperature performance verification test, draw conclusions on the identification test of glass-to-metal sealed electrical penetrations; The pilot test in step 1) includes a parallel test and a serial test; the length of the feed-through assembly is greater than the length of the short sample of the feed-through assembly; The method for drawing a conclusion on the identification test of the glass-to-metal sealed electrical penetration is: when the gas leakage rate of the glass-to-metal sealed electrical penetration is less than or equal to 1×10 -10 Pa·m 3 / s, dielectric strength greater than or equal to 2kV, insulation resistance greater than or equal to 5×10 9 Ω, when the electrical continuity of the conductor is continuous, the glass-to-metal sealed electrical penetration passes the identification test, otherwise it fails the identification test.

2. The identification test method according to claim 1, characterized in that: The method of parallel testing in step 1) is: select n short samples of the feedthrough line assembly, all of which are subjected to performance tests, then divide the n short samples of the feedthrough line assembly into at least 5 groups on average, and carry out thermal working cycle simulation tests, thermal aging tests, radiation aging tests, seismic tests and accident condition simulation tests in parallel, and take the short samples of the feedthrough line assembly that pass the corresponding tests in each group of tests and perform performance tests on them again.

3. The identification test method according to claim 2, characterized in that: The n short samples of feed-through line assemblies include n / 2 short samples of single-core feed-through line assemblies and n / 2 short samples of multi-core feed-through line assemblies, and each group of short samples of feed-through line assemblies includes n / 10 short samples of single-core feed-through line assemblies and n / 10 short samples of multi-core feed-through line assemblies.

4. The identification test method according to claim 3, characterized in that: The value of n is a natural number greater than or equal to 20, and n / 2 and n / 10 are both positive integers.

5. The identification test method according to claim 1, characterized in that: The method of the serial test in step 1) is: select m short samples of the feed-through line assembly, perform performance tests on all of them, then perform a thermal working cycle simulation test, a thermal aging test, a radiation aging test, a seismic test, and an accident condition simulation test on each short sample of the feed-through line assembly in turn, and finally perform a performance test on the m short samples of the feed-through line assembly again.

6. The identification test method according to claim 5, characterized in that: The m short samples of feed-through line assemblies include m / 2 short samples of single-core feed-through line assemblies and m / 2 short samples of multi-core feed-through line assemblies.

7. The identification test method according to claim 6, characterized in that: The value of m is a natural number greater than or equal to 10, and m / 2 is a positive integer.

8. The identification test method according to claim 1, characterized in that: The environmental assessment tests described in step 2) include performance tests, air pressure tests, pretreatment tests, temperature rise tests, short circuit tests, seismic tests, partial discharge tests, accident condition simulation tests, and short circuit tests under accident conditions.

9. The identification test method according to claim 8, characterized in that: The performance tests include a gas leakage rate test, a dielectric strength test, an insulation resistance test and a conductor electrical continuity test; the pretreatment tests include a transportation and storage simulation test, a thermal working cycle simulation test, a thermal aging test and a radiation aging test.

Images