A method for estimating the amount of sulfur hexafluoride gas in a newly-built transformer substation of a power grid

Abstract

The application discloses a kind of power grid newly-built substation sulfur hexafluoride gas estimation method, comprising the following steps: constructing the information database of different models of GIS equipment;According to the GIS equipment required by newly-built substation, in combination with the information database, the effective volume of the GIS equipment required by the newly-built substation is obtained;According to the effective volume, and in combination with the sulfur hexafluoride gas density of each sub-equipment in the required GIS equipment, the sulfur hexafluoride gas volume of the newly-built substation is obtained.By the power grid newly-built substation sulfur hexafluoride gas estimation method disclosed in the application, data support can be provided for the power grid enterprise to realize unified planning of newly-built station from the SF6 side.

Description

Technical Field

[0001] This invention relates to the field of gas-insulated switchgear technology, specifically a method for predicting sulfur hexafluoride gas in newly built power grid substations. Background Technology

[0002] Sulfur hexafluoride (SF6) gas is widely used in gas-insulated switchgear (GIS) for power grids due to its excellent insulation and arc-quenching properties. However, SF6 is a potent greenhouse gas with a global warming potential (GWP) 23,900 times that of carbon dioxide, and it can persist in the atmosphere for over 3,200 years. When designing new substations, power grid companies should not only consider their load capacity but also conduct a scientific feasibility assessment from the perspective of SF6 in advance. This will help reduce the amount of SF6 gas used. Furthermore, advance forecasting can prevent exceeding the carbon emission limits stipulated by the power grid company, thereby saving on the cost of purchasing carbon credits.

[0003] There are two main methods for calculating SF6 gas volume using existing technologies:

[0004] One method involves calculating the SF6 gas volume by subtracting the purchased and stored quantities. This method has the following main problems:

[0005] 1) Purchase quantity statistics are relatively simple and accurate, but inventory quantity is difficult to accurately count due to factors such as the varying quality of each cylinder, weighing errors, some inventory gas being substandard SF6 gas, and unavoidable leaks during storage.

[0006] 2) Since the power grid generally purchases SF6 gas in a unified manner and stores it in a unified manner by units with storage capabilities, it is impossible to accurately obtain the SF6 gas volume of small units such as GIS equipment and substations, and thus cannot provide data support for the power grid to realize unified planning of new stations from the SF6 side.

[0007] Secondly, the SF6 gas volume of each GIS device is obtained through the power grid ledger system and GIS equipment nameplate information, and the power grid SF6 gas volume is further statistically analyzed. However, the data from the above sources are often incomplete and deviate significantly from the actual values, and the effective volume of the equipment is not included.

[0008] Existing technology, specifically invention patent CN113639836A, discloses an online system for measuring the weight of sulfur hexafluoride (SF6) gas inside electrical equipment. This system uses a pressure data acquisition module to collect the pressure of SF6 gas inside the target electrical equipment, an effective volume measurement module to measure the effective volume of the target electrical equipment, and a wireless communication module to transmit the effective volume and SF6 gas pressure to a backend monitoring module. The backend monitoring system determines the weight of the SF6 gas inside the target electrical equipment based on the SF6 gas pressure and the effective volume of the target electrical equipment. However, this existing technology can only measure SF6 gas in operating electrical equipment and cannot predict the SF6 gas content in newly built substations.

[0009] In summary, the existing technology mainly suffers from inaccurate SF6 gas volume statistics, the inability to count SF6 gas volume in substations, and the inability to predict sulfur hexafluoride gas volume in newly built substations. Summary of the Invention

[0010] The technical problem to be solved by this invention is to provide a method for predicting sulfur hexafluoride gas levels in newly built power grid substations.

[0011] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0012] A method for predicting sulfur hexafluoride gas levels in newly built power grid substations includes the following steps:

[0013] S100. Construct a database of information on different models of GIS equipment;

[0014] S200. Based on the GIS equipment required for the new substation and in conjunction with the information database, obtain the effective volume of the GIS equipment required for the new substation.

[0015] S300. Based on the effective volume and the sulfur hexafluoride gas density of each sub-equipment in the required GIS equipment, obtain the sulfur hexafluoride gas volume of the newly built substation.

[0016] Advantages: This method can accurately calculate the SF6 gas volume in substations, providing data support for unified planning of new substations from the SF6 side of the power grid, and also laying the foundation for subsequent online monitoring. This application uses the GIS equipment required for new substations to obtain the effective volume, and calculates the SF6 gas volume based on the SF6 gas density. Existing technologies rely on measuring equipment collecting information from GIS equipment and then aggregating this information to a backend system to achieve online monitoring of SF6 gas volume; this method cannot be applied to the prediction of SF6 gas volume in new substations.

[0017] In one embodiment of the present invention, the effective volume of the GIS equipment required for the newly built substation is obtained by the following methods: the sub-equipment of each type of GIS equipment includes circuit breakers, busbars, instrument transformers, and surge arresters; the effective volume of the circuit breakers and instrument transformers is directly obtained by a measuring device according to the type of the GIS equipment; the effective volume of the busbars is obtained according to the substation structure and voltage level; and the effective volume of the surge arresters is obtained according to the environmental type and operating overvoltage impulse level of the substation.

[0018] In one embodiment of the present invention, the effective volume of the busbar is obtained by the following formula:

[0019]

[0020] In the formula, V M，i，j For substation j and equipment model i, the effective volume of busbar is U. M，i For model i equipment, the bus voltage level is... L is the proportional coefficient corresponding to the bus voltage level of equipment model i. M，V This is the baseline value for the busbar pipe diameter. L is the proportional coefficient corresponding to the rated current of the busbar of equipment model i. M，I This is the baseline value for the conductor diameter. The length of the busbar for substation j and equipment model i.

[0021] In one embodiment of the present invention, the effective volume of the surge arrester is obtained by the following formula:

[0022]

[0023] In the formula, V O，i For the effective volume of the surge arrester of model i equipment, K is the proportional coefficient corresponding to the overvoltage impulse level of the surge arrester of model i equipment. j For the substation environment, V O This is the baseline value for the effective volume of the surge arrester.

[0024] In one embodiment of the present invention, obtaining the sulfur hexafluoride gas volume of the newly built substation includes the following steps: obtaining the sulfur hexafluoride gas volume of each type of GIS equipment, and obtaining the gas volume of the newly built substation according to the number of each type of GIS equipment; wherein, the sulfur hexafluoride gas volume of each type of GIS equipment is obtained by the following formula:

[0025] m i，j =n L，i ×m L，i +m M，i，j +n N，i ×m N，i +nO，i ×m O，i ;

[0026] In the formula, m i，j This represents the sulfur hexafluoride gas volume of substation j and GIS equipment model i, n L，i n N，i n O，i The quantities of circuit breakers, instrument transformers, and surge arresters for model i GIS equipment are respectively, m L，i m N，i m O，i The sulfur hexafluoride gas volume (m) for the circuit breaker, instrument transformer, and surge arrester of model i equipment are respectively. M，i，j This refers to the sulfur hexafluoride gas volume at substation j and the busbar of equipment model i.

[0027] In one embodiment of the present invention, the sulfur hexafluoride gas volume of the newly built substation is obtained by the following formula:

[0028]

[0029] In the formula, m j The amount of sulfur hexafluoride gas at substation J. This refers to the number of GIS devices of model i.

[0030] In one embodiment of the present invention, the leakage amount of sulfur hexafluoride gas in the substation is obtained based on the effective volume obtained in step S200 and the sulfur hexafluoride gas density of the GIS equipment under the initial pressure and the current pressure, so as to monitor the sulfur hexafluoride gas in the substation online after the newly built substation is put into operation.

[0031] In one embodiment of the present invention, obtaining the leakage amount of sulfur hexafluoride gas in a substation includes the following steps: obtaining the leakage amount of sulfur hexafluoride gas in each sub-device of each type of GIS equipment, and the leakage amount of sulfur hexafluoride gas in each type of GIS equipment, and obtaining the gas volume of the newly built substation according to the number of GIS equipment of each type.

[0032] In one embodiment of the present invention, the sulfur hexafluoride gas leakage rate of each sub-equipment in each type of GIS equipment is obtained by the following formula:

[0033]

[0034] In the formula, m pk，q，i，j V represents the sulfur hexafluoride gas leakage rate of the q-type sub-equipment in the j-type substation and the i-type GIS equipment. q，i，j For substation j, the effective volume of type q sub-equipment in type i GIS equipment. and These represent the densities of the q-type sub-device in the i-type GIS equipment under initial pressure p0 and current pressure p1, respectively.

[0035] In one embodiment of the present invention, the sulfur hexafluoride gas leakage amount of each type of GIS equipment is obtained by the following formula:

[0036] m pk，i，j =n L，i ×m pk，L，i +m pk，M，i，j +n N，i ×m pk，N，i +n O，i ×m pk，O，i ;

[0037] In the formula, m pk，i，j Let n represent the sulfur hexafluoride gas leakage rate at substation j and GIS equipment of model i. L，i n N，i n O，i The quantities of circuit breakers, instrument transformers, and surge arresters for model i GIS equipment are respectively, m pk，L，i m pk，N，i m pk，O，i The leakage rates of sulfur hexafluoride gas from the circuit breaker, instrument transformer, and surge arrester of model i equipment are respectively expressed in m. pk，M，i，j This represents the amount of sulfur hexafluoride gas leaking from the busbar of substation j and equipment model i.

[0038] Compared with existing technologies, the beneficial effects of this invention are as follows: the effective volume of the busbar and surge arrester is a variable value, a parameter value that can only be obtained based on the actual application scenario, such as the required substation busbar length, busbar voltage level, and substation environment type. Accurate calculation of the effective volume of the busbar and surge arrester can improve the accuracy of predictions and also improve the accuracy of subsequent monitoring data during operation.

[0039] Compared to existing technologies, this new technology can accurately predict the amount of sulfur hexafluoride (SF6) gas based on the parameters of a newly built substation and has the function of calculating leakage. This is of great importance for power grid companies to plan new substations from the SF6 perspective and monitor them after they are put into operation, so as to reduce their usage and emissions. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating a method for predicting sulfur hexafluoride gas levels in a newly built power grid substation, according to an embodiment of the present invention. Detailed Implementation

[0041] To facilitate understanding of the technical solution of the present invention by those skilled in the art, the technical solution of the present invention will now be further described in conjunction with the accompanying drawings.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] Example 1

[0044] Please see Figure 1 As shown, this invention provides a method for predicting sulfur hexafluoride gas levels in newly built power grid substations, comprising the following steps:

[0045] S100. Construct a database of information on different models of GIS equipment.

[0046] In one embodiment of the present invention, the information in the information database includes, but is not limited to, the main parameter equipment model i, sub-parameters: voltage level U, rated pressure P, manufacturer S, sub-equipment type q, and variable parameters: substation bus length L, substation environment type K, rated current carrying capacity I, number of equipment of model i, and number of each sub-equipment in the equipment. Based on the equipment model i, sub-parameters, and variable parameters, the output parameter: effective volume V, can be obtained. In the above data, the four parameters—voltage level U, rated pressure P, manufacturer S, and sub-equipment type q—jointly define the GIS equipment model i; that is, when the four parameters are fixed, the GIS equipment model i is also determined. Furthermore, the equipment model i and the effective volume V have a one-way mapping relationship; that is, determining the equipment model i corresponds to a unique effective volume V. Therefore, the above four parameters also have a one-way mapping relationship with the effective volume V.

[0047] S200. Based on the GIS equipment required for the new substation and in conjunction with the information database, obtain the effective volume of the GIS equipment required for the new substation.

[0048] The effective volume V of each sub-equipment in different models of GIS equipment can be obtained through a measuring device. From the perspective of equipment type, the sub-equipment q of GIS equipment mainly includes circuit breakers L, busbars M, instrument transformers N, and surge arresters O.

[0049] The effective volume of circuit breakers and instrument transformers is obtained based on the GIS equipment model: Since GIS equipment of the same model manufactured by the same manufacturer has identical size and specifications, once the GIS equipment model i is determined, the effective volume V of the circuit breaker and instrument transformer is determined. L,i V N,i This determines the effective volume of a particular GIS device model. This volume can be obtained one by one using a measuring device. Generally, the number of GIS device models under provincial jurisdiction is between several dozen and a hundred, which is not a large amount of data and falls within the scope of statistics.

[0050] The effective volume of busbar M is determined based on the substation structure and voltage level. While there may be slight differences in the effective volume of busbars of the same type, these differences are not negligible due to the large size of the busbars. The effective volume of the busbar is obtained using the following formula:

[0051]

[0052] In the formula, V M，i，j For substation j and equipment model i, the effective volume of busbar is U. M，i For model i equipment, the bus voltage level is... L is the proportional coefficient corresponding to the bus voltage level of equipment model i. M，V This is the baseline value for the busbar pipe diameter. L is the proportional coefficient corresponding to the rated current of the busbar of equipment model i. M，I This is the baseline value for the conductor diameter. This refers to the busbar length of substation j and equipment model i. The baseline value for the busbar conduit diameter is taken as the diameter of a 110kV busbar conduit, and the baseline value for the conductor diameter is taken as the rated current carrying capacity of 500A.

[0053] The effective volume of the surge arrester (O) is determined based on the substation environment and the level of switching overvoltage impulses. The surge arrester protects against lightning impulses and switching overvoltage impulses; its effective volume is primarily related to the switching overvoltage impulses and the surrounding environment. The effective volume of the surge arrester is obtained using the following formula:

[0054]

[0055] In the formula, V O，i For the effective volume of the surge arrester of model i equipment, K is the proportional coefficient corresponding to the overvoltage impulse level of the surge arrester of model i equipment. j For the substation environment, V O This is the baseline value for the effective volume of the surge arrester.

[0056] S300. Based on the effective volume and the sulfur hexafluoride gas density of each sub-equipment in the required GIS equipment, obtain the sulfur hexafluoride gas volume of the newly built substation.

[0057] In the information database, input the GIS equipment information and variable parameters for the newly built substation j. For example, input the main parameter GIS equipment model i and the variable parameters L, K, I, n, t, or input the sub-parameters U, P, S, q and the variable parameters L, K, I, n, t. The system will then automatically estimate the sulfur hexafluoride gas volume of the newly built substation. Specifically, when the main parameter GIS equipment model i is input, the system automatically outputs the sub-parameters U, P, S, q, which, combined with the variable parameters, are used to estimate the sulfur hexafluoride gas volume of the newly built substation.

[0058] Based on the input parameters, the effective volume V of different sub-devices q and the sulfur hexafluoride gas volume of different sub-devices are calculated. The sulfur hexafluoride gas volume of different sub-devices is obtained using the following formula:

[0059]

[0060] In the formula, m L，i m N，i m N，O The gas mass, ρ, for the circuit breaker, instrument transformer, and surge arrester of model i equipment are respectively. L，i ρ N，i ρ O，i The densities of circuit breakers, instrument transformers, and surge arresters for model i equipment are respectively, m M，i，j and ρ M，i，j The mass and density of gas in the busbar of substation J and equipment of model I.

[0061] Since sulfur hexafluoride gas is a non-ideal gas and does not satisfy the ideal gas law, it needs to be calculated using empirical formulas for sulfur hexafluoride gas:

[0062]

[0063]

[0064]

[0065] R1 = 56.5902 × 10 -5 ;

[0066] In the formula, The absolute pressure of sulfur hexafluoride gas for each sub-device, in MPa; The density of sulfur hexafluoride gas for each sub-device, in kg / m³. 3 T represents the thermodynamic temperature of sulfur hexafluoride gas in each sub-device, measured in K.

[0067] The sulfur hexafluoride gas volume for each type of GIS equipment is obtained, and the gas volume for the newly built substation is determined based on the number of GIS equipment of each type. The sulfur hexafluoride gas volume for each type of GIS equipment is obtained using the following formula:

[0068] m i，j =n L，i ×m L，i +m M，i，j +n N，i ×m N，i +n O，i ×m O，i ;

[0069] In the formula, m i，jThis represents the sulfur hexafluoride gas volume of substation j and GIS equipment model i, n L，i n N，i n O，i The quantities of circuit breakers, instrument transformers, and surge arresters for model i GIS equipment are respectively, m L，i m N，i m O，i The sulfur hexafluoride gas volume (m) for the circuit breaker, instrument transformer, and surge arrester of model i equipment are respectively. M，i，j This refers to the sulfur hexafluoride gas volume at substation j and the busbar of equipment model i.

[0070] Model i is the main parameter equipment model. The estimated sulfur hexafluoride (SF6) gas volume of the newly built substation is obtained by obtaining the estimated SF6 gas volume for all Model i GIS equipment. The estimated SF6 gas volume for all Model i GIS equipment can be used as the main reference value. The SF6 gas volume of the newly built substation is then obtained using the following formula:

[0071]

[0072] In the formula, m j The amount of sulfur hexafluoride gas at substation J. This refers to the number of GIS devices of model i.

[0073] Furthermore, it is possible to estimate the sulfur hexafluoride (SF6) gas volume per unit of each level of the power grid based on the gas volume of newly built substations. The SF6 gas volume per unit of each level of the power grid is the sum of the gas volumes of its subordinate substations, i.e.:

[0074] m s =∑m j ;

[0075] In the formula, m s The amount of sulfur hexafluoride gas is expressed in s grid units.

[0076] Example 2

[0077] Based on the effective volume obtained in step S200 of Example 1, and the sulfur hexafluoride gas density of the GIS equipment under initial and current pressures, the leakage amount of sulfur hexafluoride gas in the substation is obtained, which is used to monitor the sulfur hexafluoride gas in the substation online after the newly built substation is put into operation.

[0078] In this embodiment, after the newly built substation is put into operation, in addition to monitoring the sulfur hexafluoride gas volume of each sub-equipment, it is also necessary to monitor the sulfur hexafluoride gas leakage of each sub-equipment in order to accurately grasp the sulfur hexafluoride gas emission.

[0079] Obtaining the leakage amount of sulfur hexafluoride gas in a substation includes the following steps: obtaining the leakage amount of sulfur hexafluoride gas in each sub-equipment of each type of GIS equipment, as well as the leakage amount of sulfur hexafluoride gas in each type of GIS equipment, and obtaining the gas volume of the newly built substation based on the number of GIS equipment of each type.

[0080] For each type of GIS equipment, the sulfur hexafluoride gas leakage rate of each sub-equipment is obtained using the following formula:

[0081]

[0082] In the formula, m pk，q，i，j V represents the sulfur hexafluoride gas leakage rate of the q-type sub-equipment in the j-type substation and the i-type GIS equipment. q，i，j For substation j, the effective volume of type q sub-equipment in type i GIS equipment. and These represent the densities of type q equipment in model i GIS equipment under initial pressure p0 and current pressure p1, respectively.

[0083] The sulfur hexafluoride gas leakage rate for each type of GIS equipment is obtained using the following formula:

[0084] m pk，i，j =n L，i ×m pk，L，i +m pk，M，i，j +n N，i ×m pk，N，i +n O，i ×m pk，O，i ;

[0085] In the formula, m pk，i，j Let n represent the sulfur hexafluoride gas leakage rate at substation j and GIS equipment of model i. L，i n N，i n O，i The quantities of circuit breakers, instrument transformers, and surge arresters for model i GIS equipment are respectively, m pk，L，i m pk，N，i m pk，O，i The leakage rates of sulfur hexafluoride gas from the circuit breaker, instrument transformer, and surge arrester of model i equipment are respectively expressed in m. pk，M，i，j This represents the amount of sulfur hexafluoride gas leaking from the busbar of substation j and equipment model i.

[0086] Similarly, since model i is the main parameter equipment model, the sulfur hexafluoride (SF6) gas leakage rate of the newly built substation is obtained by using the SF6 gas leakage rate of all model i GIS equipment as the main reference value. The SF6 gas leakage rate of the newly built substation is then obtained using the following formula:

[0087]

[0088] In the formula, m pk，j This represents the amount of sulfur hexafluoride gas in the newly built substation. This represents the number of GIS devices of model i.

[0089] Furthermore, based on the sulfur hexafluoride (SF6) gas leakage rate of newly built substations, the SF6 gas leakage rate of each level of the power grid can be estimated. The SF6 gas leakage rate of each level of the power grid is the sum of the gas volumes of its subordinate substations, i.e.:

[0090] m pk，s =∑m pk，j ;

[0091] In the formula, m pk，s The amount of sulfur hexafluoride gas leakage is expressed in s units of the power grid.

[0092] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0093] The above embodiments are merely examples of implementation methods of the invention. The scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A method for predicting sulfur hexafluoride gas levels in newly built power grid substations, characterized in that, Includes the following steps: S100. Construct a database of information on different models of GIS equipment; S200. Based on the GIS equipment required for the new substation and in conjunction with the information database, obtain the effective volume of the GIS equipment required for the new substation, including: Sub-equipment of each type of GIS equipment includes circuit breakers, busbars, instrument transformers, and surge arresters; The effective volume of the circuit breaker and the current transformer can be directly obtained through a measuring device according to the model of the GIS equipment. The effective volume of the busbar is obtained based on the substation structure and voltage level using the following formula: ； The effective volume of the surge arrester is obtained based on the environmental type and operational overvoltage impulse level of the substation, using the following formula: ； In the formula, for j Substation No. i Effective volume of the busbar of the model equipment for i Bus voltage level of the equipment model for i The proportional coefficient corresponding to the bus voltage level of the equipment model. This is the baseline value for the busbar pipe diameter. for i The proportional coefficient corresponding to the rated current of the busbar of the equipment model. This is the baseline value for the conductor diameter. for j Substation No. i Busbar length of the equipment model; for i Effective volume of surge arrester for this type of equipment Model i The proportional coefficient corresponding to the overvoltage impulse level of the equipment surge arrester. Substation environment type, This is the baseline value for the effective volume of the surge arrester; S300. Based on the effective volume and the sulfur hexafluoride gas density of each sub-equipment in the required GIS equipment, obtain the sulfur hexafluoride gas volume of the newly built substation.

2. The method for predicting sulfur hexafluoride gas in newly built substations of power grids according to claim 1, characterized in that, Obtaining the sulfur hexafluoride (SF6) gas volume of the newly built substation includes the following steps: obtaining the SF6 gas volume of each type of GIS equipment, and obtaining the gas volume of the newly built substation based on the number of GIS equipment of each type; wherein, the SF6 gas volume of each type of GIS equipment is obtained by the following formula: ； In the formula, Represented as j substation i The sulfur hexafluoride gas volume of the GIS equipment model , , They are respectively i The number of circuit breakers, instrument transformers, and surge arresters in the GIS equipment of each model. , , These refer to the sulfur hexafluoride gas volume of the circuit breaker, instrument transformer, and surge arrester of model i equipment. Represented as j substation i The amount of sulfur hexafluoride gas in the busbar of the model equipment.

3. The method for predicting sulfur hexafluoride gas in newly built substations of power grids according to claim 2, characterized in that, The amount of sulfur hexafluoride gas in the newly built substation is obtained using the following formula: ； In the formula, for j The amount of sulfur hexafluoride gas in the substation for i Quantity of GIS equipment of various models.

4. The method for predicting sulfur hexafluoride gas in newly built substations of power grids according to claim 1, characterized in that, Based on the effective volume obtained in step S200 and the sulfur hexafluoride gas density of the GIS equipment under initial and current pressures, the leakage amount of sulfur hexafluoride gas in the substation is obtained, which is used to monitor the sulfur hexafluoride gas in the substation online after the newly built substation is put into operation.

5. The method for predicting sulfur hexafluoride gas in newly built substations of power grids according to claim 4, characterized in that, Obtaining the leakage amount of sulfur hexafluoride gas in a substation includes the following steps: obtaining the leakage amount of sulfur hexafluoride gas in each sub-equipment of each type of GIS equipment, as well as the leakage amount of sulfur hexafluoride gas in each type of GIS equipment, and obtaining the gas volume of the newly built substation based on the number of GIS equipment of each type.

6. The method for predicting sulfur hexafluoride gas in newly built substations of power grids according to claim 5, characterized in that, For each type of GIS equipment, the sulfur hexafluoride gas leakage rate of each sub-equipment is obtained using the following formula: ； In the formula, for j substation i In the model of GIS equipment q Sulfur hexafluoride gas leakage rate of type sub-equipment for j substation i In the model of GIS equipment q Effective volume of type sub-device and They are respectively i In the model of GIS equipment q Type of sub-device at initial pressure and current pressure The density below.

7. The method for predicting sulfur hexafluoride gas in newly built substations of power grids according to claim 6, characterized in that, The sulfur hexafluoride gas leakage rate for each type of GIS equipment is obtained using the following formula: ； In the formula, Represented as j substation i Sulfur hexafluoride gas leakage rate of the GIS equipment model , , They are respectively i The number of circuit breakers, instrument transformers, and surge arresters in the GIS equipment of each model. , , They are respectively i The leakage rate of sulfur hexafluoride gas from circuit breakers, instrument transformers, and surge arresters of this type of equipment. Represented as j substation i The amount of sulfur hexafluoride gas leaking from the busbar of the model equipment.

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