Experimental system and method for detecting biological safety of mixed gas decomposition product

Abstract

The invention discloses an experimental system and method for detecting the biological safety of a mixed gas decomposition product, which are characterized in that a mixed gas is used as an arc extinguishing medium to be repeatedly cut off on a load current cut-off test platform, a mouse acute inhalation test is carried out on an arc decomposition gas, and the biological safety of the mixed gas decomposition product is evaluated based on a test result. Comprising an overload current synthesis loop, a load current on-off test platform acting on the overload current synthesis loop, a gas chromatograph-mass spectrometer used for controlling the load current on-off test platform, and a gas suction toxicity test platform used for cooperating with the load current on-off test platform. According to the experimental system and method for detecting the biological safety of the decomposition product of the mixed gas, the safety of operators in the maintenance process of power equipment is ensured, important guidance is provided for safe operation of the power industry, and meanwhile the application progress of SF6 / N2 mixed gas is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of biosafety detection of insulating gas power equipment, and in particular to a biosafety experimental system and method for detecting biosafety of mixed gas decomposition products. Background Art

[0002] Sulfur hexafluoride (SF6) is a gas widely used in the power industry, mainly for insulation and arc extinguishing of high-voltage electrical equipment. Due to its excellent electrical insulation properties and thermal stability, SF6 has been widely used in transformers, circuit breakers and other equipment. However, SF6 has an extremely high greenhouse effect potential, which has a serious impact on the environment. Its global warming potential is 23,900 times that of carbon dioxide. Therefore, with increasingly stringent environmental regulations, it is particularly important to find alternative gases to SF6. As an alternative, SF6 / N2 mixed gas effectively reduces the sensitivity of SF6 to local electric field distortion and alleviates the problems of SF6 greenhouse effect and high liquefaction temperature.

[0003] When considering the application of SF6 / N2 mixed gas, biosafety is a key factor that cannot be ignored. Although this mixed gas performs well in electrical properties, the biosafety of its decomposition products may pose potential hazards to humans and the environment. In practical applications, it is crucial to understand and evaluate the biosafety of its decomposition products. Especially during power equipment failure or maintenance, toxic or harmful decomposition products may be produced, posing risks to operators and the surrounding ecosystem. Therefore, clarifying the biosafety of the decomposition products produced during the use of SF6 / N2 mixed gas is the basis for its safe application.

[0004] At present, there is no unified detection method for the toxicity of gas decomposition products, and it mainly focuses on the detection of SF6 / N2. Although some experimental methods such as gas chromatography and mass spectrometry are effective in detecting specific components, they often lack specificity and cannot fully evaluate the toxicity of decomposition products. In addition, during equipment maintenance and troubleshooting, decomposition products may pose a serious threat to the health of maintenance personnel. Summary of the invention

[0005] In view of the problems existing in the above-mentioned existing biological safety experimental system for detecting decomposition products of mixed gases, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a biological safety experimental system for detecting the decomposition products of mixed gases, the purpose of which is to detect the biological toxicity of the decomposition components produced by SF6 / N2 mixed gas power equipment during operation and fault conditions, and provide a basis for subsequent operation and maintenance work.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: including, using mixed gas as arc extinguishing medium to perform repeated interruption on a load current interruption test platform, conducting an acute inhalation test on mice for arc decomposition gas, and evaluating the biosafety of the decomposition products of the mixed gas based on the test results.

[0008] As a preferred solution of the biological safety experimental system for detecting decomposition products of mixed gases described in the present invention, an overload current synthesis loop is set up to carry out an acute inhalation toxicity test of post-arc gas in mice on a gas inhalation toxicity test platform through a load current breaking test platform using a gas chromatography-mass spectrometer.

[0009] As a preferred solution of the biological safety experimental system for detecting decomposition products of mixed gases described in the present invention, it includes: an overload current synthesis circuit, a load current interruption test platform acting on the overload current synthesis circuit, a gas chromatography-mass spectrometry instrument for controlling the load current interruption test platform, and a gas inhalation toxicity test platform for cooperating with the load current interruption test platform.

[0010] As a preferred solution of the biological safety experimental system for detecting the decomposition products of mixed gases described in the present invention, the biological safety of the decomposition products of mixed gases is comprehensively evaluated and detected as a whole by acting on the load current interruption test platform through the overload current synthesis circuit.

[0011] As a preferred solution of the biological safety experimental system for detecting the decomposition products of mixed gases described in the present invention, the type and content of the gas after the gas chromatography-mass spectrometry is turned on and off is extracted to conduct a gas inhalation toxicity test platform experiment.

[0012] As a preferred solution of the biological safety experimental system for detecting the decomposition products of mixed gas of the present invention, the load current interruption test platform is mainly composed of an arc extinguishing chamber and a load switch arranged in the arc extinguishing chamber;

[0013] The load switch is also connected to an overload current synthesis circuit and a voltage and current data acquisition system. The load switch adopts an LC oscillation circuit, and the pre-charged capacitor group discharges through the series reactor group to form an attenuated sinusoidal discharge current.

[0014] As a preferred solution of the biological safety experimental system for detecting decomposition products of mixed gases described in the present invention, the gas inhalation toxicity test platform is coordinated with the gas chromatograph-mass spectrometer, and the gas inhalation toxicity test platform includes an intelligent dynamic gas distributor connected to the load current interruption test platform together with the gas chromatograph-mass spectrometer, a poisoning chamber and a dry air bottle respectively connected to the connection ends of the intelligent dynamic gas distributor, and a drinking water source and a gas recovery device connected to both ends of the poisoning chamber.

[0015] As a preferred solution of the biosafety experimental system for detecting the decomposition products of mixed gases described in the present invention, the decomposition gas of the load current interruption test platform is mixed with the dry air in the dry air bottle through an intelligent dynamic gas distributor to prepare test gases of different concentrations, and the high-concentration standard gas is mixed and diluted to become a low-concentration sample gas, and the prepared gas is output at a set flow rate.

[0016] In view of the problems existing in the above-mentioned existing experimental methods for detecting the biosafety of decomposition products of mixed gases, the present invention is proposed.

[0017] Therefore, the purpose of the present invention is to provide a method for detecting the biosafety of decomposition products of mixed gases, the purpose of which is to detect the biological toxicity of decomposition components produced by SF6 / N2 mixed gas power equipment during operation and fault conditions, and to provide a basis for subsequent operation and maintenance work.

[0018] In order to solve the above technical problems, the present invention provides the following technical solutions: including: filling a 30% SF6-70% N2 mixed gas into the load switch as an arc extinguishing medium, and selecting a commonly used gas pressure of 0.3MPa in the equipment for experimental preparation;

[0019] Through the overload current synthesis circuit, the load switch provides the required breaking overload current, and 200 sets of breaking tests are carried out on the 30% SF6-70% N2 mixed gas to ensure that the SF6 / N2 mixed gas is fully decomposed;

[0020] Open the load switch and extract the decomposition gas through the arc extinguishing chamber;

[0021] Conduct a 4h acute inhalation toxicity test on SF6 / N2 decomposition gas;

[0022] The SF6 / N2 decomposition gas of different concentrations was mixed with the dry air in the dry air bottle by an intelligent dynamic gas distributor as the gas for the 4-hour acute inhalation toxicity test for mice;

[0023] The median lethal concentration (LC50) range was confirmed through preliminary experiments, and different concentrations of SF6 / N2 decomposition gas were further set within the confirmed range to be mixed with dry air and filled into the contamination chamber;

[0024] A gas chromatography-mass spectrometer is used to detect the type and content of the gas in the load current breaking test platform after breaking.

[0025] As a preferred solution of the method for detecting the biosafety of the decomposition products of the mixed gas described in the present invention, the 4h acute inhalation toxicity test of the SF6 / N2 decomposition gas is specifically as follows:

[0026] The intelligent dynamic gas distributor mixed different concentrations of SF6 / N2 decomposition gas with dry air from a dry air bottle as the gas for the 4-hour acute inhalation toxicity test for mice. The LC50 range of the median lethal concentration was confirmed through preliminary experiments. Within the confirmed range, different concentrations of SF6 / N2 decomposition gas and dry air were further mixed and filled into the poisoning chamber. Five adult mice of about 8 weeks old, weighing 18-22g, were selected for each group of experiments.

[0027] Five groups of decomposition gas test groups with different concentrations and one control group were set up. The control group was dry air. Male and female mice were tested simultaneously in each group to determine the gender difference. The exposure time was 4 hours.

[0028] The changes in the vital signs of mice were observed, the mortality rate of each group was counted, the LC50 of the decomposition gas was calculated, and blood and tissue samples of major organs were collected for blood cell and pathological analysis to comprehensively evaluate the biosafety of SF6 / N2 arc decomposition gas.

[0029] The beneficial effects of the present invention are as follows: a biosafety experimental system and method for detecting the decomposition products of SF6 / N2 mixed gas are proposed to ensure the safety of operators during the maintenance of power equipment, provide important guidance for the safe operation of the power industry, and promote the application progress of SF6 / N2 mixed gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing 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. Among them:

[0031] Figure 1 It is a schematic diagram of the overall system of the biosafety experimental system and method for detecting the decomposition products of mixed gases of the present invention.

[0032] Figure 2 This is a schematic diagram of the system of Example 2 of the present invention for detecting the biosafety of mixed gas decomposition products.

[0033] Figure 3 This is a schematic diagram of the system of Example 3 of the biosafety experimental system and method for detecting decomposition products of mixed gases of the present invention.

[0034] Figure 4 This is a schematic diagram of the system of Example 4 of the biosafety experimental system and method for detecting decomposition products of mixed gases of the present invention.

[0035] Figure 5The schematic diagram of the structure of the contamination chamber of the biosafety experimental system and method for detecting the decomposition products of mixed gases of the present invention.

[0036] Figure 6 The schematic diagram of the synthesis loop principle of the biosafety experimental system and method for detecting the decomposition products of mixed gases of the present invention. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] Example 1

[0042] Reference Figure 1 and Figure 6 , which is the first embodiment of the present invention, provides a biosafety experimental system and method for detecting the decomposition products of a mixed gas. This device uses a mixed gas as an arc extinguishing medium to perform repeated interruptions on a load current interruption test platform 102, conducts an acute inhalation test on mice for the arc decomposition gas, and evaluates the biosafety of the decomposition products of the mixed gas based on the test results. The device includes an overload current synthesis loop 101, a load current interruption test platform 102 that acts on the synthesis loop 101 of the overload current, a gas chromatography-mass spectrometry instrument 103 for controlling the load current interruption test platform 102, and a gas inhalation toxicity test platform 104 for cooperating with the load current interruption test platform 102.

[0043] Among them, 30% SF6-70% N2 mixed gas was selected as the arc extinguishing medium to carry out 200 single-phase breaking tests on the load switch 102b, wherein the load current breaking test platform 102 is mainly composed of an arc extinguishing chamber 102a, a load switch 102b, an overload current synthesis circuit 101 and a voltage and current data acquisition system.

[0044] The load switch 102b is a 630A / 24kV magnetic blow-out load switch. The schematic diagram of the overload current synthesis circuit 101 is as follows: Figure 2 As shown, an LC oscillation circuit is used, in which the pre-charged capacitor group discharges through the series reactor group to form a decaying sinusoidal discharge current, providing the required overload breaking current for the load switch 102b. The capacitance and inductance parameters are C1=16.8mF, L1=0.603mH, and the oscillation frequency is 50Hz.

[0045] During use, after 200 breaking tests are completed, the type and content of the gas in the arc extinguishing chamber 102a after breaking are measured using a gas chromatograph-mass spectrometer 103, i.e., GC-MS. The gas in the arc extinguishing chamber 102a is then extracted, and the gas inhalation toxicity test platform 102 conducts a 4-hour post-arc gas acute inhalation toxicity test on mice. The extracted decomposition gas in the arc extinguishing chamber 102a is mixed with dry air from a dry air bottle 104b through an intelligent dynamic gas distributor 104a of Tanggao Electric GC400 to prepare test gases of different concentrations. The intelligent dynamic gas distributor 104a is based on the principle of mass flow mixing method, and can mix and dilute high-concentration standard gas into low-concentration sample gas. At the same time, the prepared gas is output to the contamination chamber 104c at a set flow rate.

[0046] The contamination chamber 104c is connected to a drinking water source 104d and a gas recovery device 104e respectively. The biosafety of SF6 / N2 arc decomposition gas is comprehensively evaluated through the changes in vital signs, LC50 and blood cell count of mice after acute inhalation of the mixed gas after interruption.

[0047] Example 2

[0048] Reference Figure 2 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that the gas inhalation toxicity test platform 104 is a mouse living room.

[0049] During the operation and fault conditions of SF6 / N2 mixed gas power equipment, SF6 / N2 is prone to decomposition, and some of the decomposition products are highly biotoxic. Although the content of a single biotoxic component is not too high, if a large amount of decomposition occurs in the equipment under fault conditions, the mixed decomposition products may be highly biotoxic, endangering the safety of operators.

[0050] Compared with Example 1, further, 30% SF6-70% N2 mixed gas is selected as the arc extinguishing medium to carry out 200 single-phase breaking tests on the load switch 102b of the load current breaking test platform 102, and an overload current synthesis loop 101 is set to carry out an acute inhalation toxicity test of post-arc gas in mice on the gas inhalation toxicity test platform 104 through the load current breaking test platform 102 using a gas chromatography-mass spectrometer 103.

[0051] During use, the overload current synthesis circuit 101 acts on the load current interruption test platform 102 to comprehensively evaluate the biosafety of the mixed gas decomposition products as a whole, and the type and content of the gas after interruption are extracted by the gas chromatography-mass spectrometry 103 to experiment on mice in the living room of the gas inhalation toxicity test platform 104.

[0052] The remaining structures are the same as those of Example 1.

[0053] Example 3

[0054] Reference Figure 3 , which is the third embodiment of the present invention. This embodiment is different from the first embodiment in that it acts directly on mice.

[0055] Compared with Example 1, further, mice are used as experimental subjects G. When 30% SF6-70% N2 mixed gas is selected as the arc extinguishing medium to perform 200 single-phase breaking tests on the load switch 102b, an LC oscillation circuit is adopted through the overload current synthesis circuit 101, and the pre-charged capacitor group is discharged through the series inductor group to form an attenuated sinusoidal discharge current, thereby providing the required breaking overload current for the load switch 102b.

[0056] During use, after 200 breaking tests are completed, the gas in the arc extinguishing chamber 102a will directly act on the experimental body G of the mouse, observe the changes in the mouse's vital signs, collect blood and tissue samples of major organs for blood cell and pathological analysis, and comprehensively evaluate the biosafety of SF6 / N2 arc decomposition gas.

[0057] The remaining structures are the same as those of Example 1.

[0058] Example 4

[0059] Reference Figure 1 and Figure 4 , which is the fourth embodiment of the present invention. This embodiment is different from the first embodiment in that: the load current interruption test platform 102 is composed of an overload current synthesis circuit 101, an arc extinguishing chamber 102a and a load switch 102b arranged in the arc extinguishing chamber 102a.

[0060] The remaining structures are the same as those of Example 1.

[0061] The specific implementation steps are:

[0062] S1. Fill the load switch 102b with 30% SF6-70% N2 mixed gas as arc extinguishing medium, and select the commonly used gas pressure of 0.3MPa in the equipment for experimental preparation;

[0063] S2. Generate the required breaking overload current through the overload current synthesis circuit 101, and perform 200 breaking tests on the 30% SF6-70% N2 mixed gas to ensure that the SF6 / N2 mixed gas is fully decomposed;

[0064] S3, open the load switch 102b, and extract the decomposed gas through the arc extinguishing chamber 102a;

[0065] S4. Conduct a 4h acute inhalation toxicity test on SF6 / N2 decomposition gas;

[0066] The intelligent dynamic gas distributor 104a mixes the decomposed gases of SF6 / N2 with different concentrations with the dry air in the dry air bottle 104b as the gas for the 4-hour acute inhalation toxicity test for mice;

[0067] The median lethal concentration LC50 range is confirmed through preliminary experiments, and different concentrations of SF6 / N2 decomposition gas are further set within the confirmed range to be mixed with dry air and filled into the contamination chamber 104c;

[0068] Each group of experimental mice used 5 adult mice about 8 weeks old, weighing 18-22g;

[0069] Five groups of decomposition gas test groups with different concentrations and one control group (dry air) were set up. Male and female mice were used in each test to determine the gender difference. Five adult mice of about 8 weeks old, weighing 18-22g, were used in each test. The exposure time was 4h.

[0070] The changes in the vital signs of mice were observed, the mortality rate of each group was counted, the LC50 of the decomposition gas was calculated, and blood and tissue samples of major organs were collected for blood cell and pathological analysis to comprehensively evaluate the biosafety of SF6 / N2 arc decomposition gas.

[0071] S5. Use the gas chromatography-mass spectrometry 103 to detect the type and content of the gas in the load current interruption test platform 102 after interruption.

[0072] In S4, it is also possible to perform a comparison by setting up more test groups in Examples 1 to 3.

[0073] Example 5

[0074] Reference Figure 1 and Figure 5 , which is the fifth embodiment of the present invention. This embodiment is different from the fourth embodiment in that: the specific structure of the contamination chamber 104c.

[0075] Compared with Example 4, further, an air inlet 104c-1 is provided on one side of the poisoning chamber 104c, a water inlet 104c-2 and an air outlet 104c-3 are respectively provided on the other side of the poisoning chamber 104c, and an observation window 104c-4 is provided on the outer surface of the poisoning chamber 104c for taking in and placing test animals and conducting observations.

[0076] The air inlet 104c-1 is used to connect to the air inlet of the intelligent dynamic gas distributor 104a, the water inlet 104c-2 is used to connect to the drinking water source 104d to facilitate the survival and testing of experimental animals, and the air outlet 104c-3 is connected to a gas recovery device 104e to recover the gas to avoid affecting the remaining groups of experimental animals and experimental data.

[0077] The contamination chamber 104c has a length, a width and a height of 40 cm, 30 cm and 20 cm respectively, and is made of a polytetrafluoroethylene plate with a thickness of 1 cm.

[0078] The remaining structures are the same as those of Example 4.

[0079] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0080] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A biological safety experimental system for detecting decomposition products of mixed gases, characterized by: include, Repeated interruption is performed on a load current interruption test platform (102) using the mixed gas as an arc extinguishing medium, an acute inhalation test of arc decomposition gas in mice is carried out, and the biosafety of the decomposition products of the mixed gas is evaluated based on the test results.

2. The biosafety experimental system for detecting decomposition products of mixed gas according to claim 1, characterized in that: An overload current synthesis circuit (101) is provided to carry out an acute inhalation toxicity test of post-arc gas on mice on a gas inhalation toxicity test platform (104) through a load current breaking test platform (102) and a gas chromatography-mass spectrometer (103).

3. The biosafety experimental system for detecting decomposition products of mixed gas according to claim 1, characterized in that: The invention comprises an overload current synthesis circuit (101), a load current interruption test platform (102) acting on the overload current synthesis circuit (101), a gas chromatography-mass spectrometry instrument (103) for controlling the load current interruption test platform (102), and a gas inhalation toxicity test platform (104) for cooperating with the load current interruption test platform (102).

4. The biosafety experimental system for detecting decomposition products of mixed gas according to claim 2 or 3, characterized in that: The overload current synthesis circuit (101) acts on the load current interruption test platform (102) to comprehensively evaluate and detect the biological safety of the mixed gas decomposition products as a whole.

5. The biological safety experimental system for detecting decomposition products of mixed gas according to claim 4, characterized in that: The type and content of the gas after the gas chromatography-mass spectrometry (103) is turned on and off are extracted to conduct experiments on the gas inhalation toxicity test platform (104).

6. The biosafety experimental system for detecting decomposition products of mixed gas according to claim 5, characterized in that: The load current interruption test platform (102) is mainly composed of an arc extinguishing chamber (102a) and a load switch (102b) arranged in the arc extinguishing chamber (102a); The load switch (102b) is also connected to an overload current synthesis circuit (101) and a voltage and current data acquisition system. The load switch (102b) adopts an LC oscillation circuit, and a pre-charged capacitor group discharges through a series reactor group to form an attenuated sinusoidal discharge current.

7. The biosafety experimental system for detecting decomposition products of mixed gas according to claim 5 or 6, characterized in that: The gas inhalation toxicity test platform (104) cooperates with the gas chromatograph-mass spectrometer (103), and comprises an intelligent dynamic gas distributor (104a) connected to the load current interruption test platform (102) together with the gas chromatograph-mass spectrometer (103), a poisoning chamber (104c) and a dry air bottle (104b) respectively connected to the connection ends of the intelligent dynamic gas distributor (104a), and a drinking water source (104d) and a gas recovery device (104e) connected to both ends of the poisoning chamber (104c).

8. The biosafety experimental system for detecting decomposition products of mixed gas according to claim 7, characterized in that: The decomposed gas from the load current interruption test platform (102) is mixed with dry air from a dry air bottle (104b) through an intelligent dynamic gas distributor (104a) to prepare test gases of different concentrations. The high-concentration standard gas is mixed and diluted to become a low-concentration sample gas, and the prepared gas is output at a set flow rate.

9. A method for testing the biosafety of decomposition products of mixed gases, characterized by: The biosafety test system for detecting decomposition products of mixed gas according to claim 8 further comprises: A 30% SF6-70% N2 mixed gas is charged into the load switch (102b) as an arc extinguishing medium, and a common gas pressure of 0.3 MPa in the equipment is selected for experimental preparation; The overload current synthesis circuit (101) generates a load switch (102b) to provide the required breaking overload current, and performs 200 breaking tests on the 30% SF6-70% N2 mixed gas to ensure that the SF6 / N2 mixed gas is fully decomposed; Opening the load switch (102b) and extracting the decomposed gas through the arc extinguishing chamber (102a); Conduct a 4h acute inhalation toxicity test on SF6 / N2 decomposition gas; Using an intelligent dynamic gas distributor (104a), SF6 / N2 decomposition gases of different concentrations are mixed with dry air from a dry air bottle (104b) as a gas for a 4-hour acute inhalation toxicity test for mice; The median lethal concentration LC50 range is confirmed through preliminary experiments, and different concentrations of SF6 / N2 decomposition gas are further set within the confirmed range to be mixed with dry air and filled into the contamination chamber (104c); A gas chromatography-mass spectrometer (103) is used to detect the type and content of the gas in the load current interruption test platform (102) after interruption.

10. The method for detecting the biosafety of decomposition products of mixed gas according to claim 9, characterized in that: The 4h acute inhalation toxicity test on SF6 / N2 decomposition gas is specifically as follows: The SF6 / N2 decomposition gas of different concentrations is mixed with the dry air in the dry air bottle (104b) by an intelligent dynamic gas distributor (104a) as a gas for a 4-hour acute inhalation toxicity test for mice. The median lethal concentration LC50 range is confirmed by preliminary experiments. Within the confirmed range, the SF6 / N2 decomposition gas of different concentrations is further set to be mixed with the dry air and filled into the poisoning chamber (104c). Five adult mice of about 8 weeks old and weighing 18 to 22 g are selected for each group of experiments. Five groups of decomposition gas test groups with different concentrations and one control group were set up. The control group was dry air. Male and female mice were tested simultaneously in each group to determine the gender difference. The exposure time was 4 hours. The changes in the vital signs of mice were observed, the mortality rate of each group was counted, the LC50 of the decomposition gas was calculated, and blood and tissue samples of major organs were collected for blood cell and pathological analysis to comprehensively evaluate the biosafety of SF6 / N2 arc decomposition gas.

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