GIS equipment basin-type insulator condensation test system and method

Abstract

According to the GIS equipment basin-type insulator condensation test system and method, a gas state multi-parameter sensing module is installed at the position of a hand hole in the top of a GIS shell and used for measuring the temperature and the relative humidity of gas at the top of the GIS; the temperature control pad completely wraps a GIS housing area so as to simulate a temperature distribution state formed by an internal and external temperature difference in an actual GIS operation process and is used for controlling the temperature so as to form condensation. The ultrahigh frequency-gas state fusion sensor is installed at the position of a bottom hand hole of a GIS shell so as to obtain the temperature and the relative humidity of gas at the bottom of the GIS and obtain ultrahigh frequency signals during discharging, and the position of the bottom hand hole is close to the condensation defect setting position. The data display control panel is connected with the gas state multi-parameter sensing module, the platinum resistor temperature sensor and the ultrahigh frequency-gas state fusion sensor so as to collect temperature, relative humidity and ultrahigh frequency signals, and communicates with the temperature control pad, the heating oil pump and the gas humidity control device so as to control the temperature and the humidity.

Description

Technical Field

[0001] The invention relates to the technical field of GIS equipment, in particular to a condensation test system for pot-type insulators of GIS equipment. Background Art

[0002] Gas insulated switchgear (GIS) has been widely used due to its compact structure, small footprint, and high insulation reliability. Under normal conditions, the moisture content inside the GIS is maintained at a low level. However, in extremely low-temperature areas in winter such as the northwest and northeast, there is a certain possibility that the temperature in some areas of the pot insulator is lower than the dew point of the insulating gas, causing condensation on the insulator, resulting in a significant decrease in the insulation strength of the insulator, and even ground flashovers during unit operation, resulting in shutdowns. The existing technology urgently needs a condensation test system and method for pot insulators of GIS equipment to carry out research on condensation of pot insulators of GIS equipment.

[0003] The information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0004] In view of the deficiencies or defects of the prior art, a condensation test system and method for pot-type insulators of GIS equipment are provided, which can effectively test the condensation of pot-type insulators of GIS equipment.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] A GIS equipment pot insulator condensation test system includes:

[0007] A real GIS test platform, which includes a GIS shell and a central guide rod arranged in the GIS shell;

[0008] A digital pressure gauge, which is arranged on the GIS housing and is used to measure the gas pressure inside the GIS;

[0009] The gas state multi-parameter sensor module is installed at the top hand hole of the GIS shell to measure the temperature and relative humidity of the gas on the top of the GIS;

[0010] Temperature control pads, which completely wrap the GIS shell area to simulate the temperature distribution state formed by the temperature difference between the inside and outside during the actual GIS operation and are used to control the temperature to form condensation;

[0011] A platinum resistance temperature sensor is arranged on the surface of the GIS housing to measure the actual temperature of the GIS housing.

[0012] The heating element is a hollow spiral tube installed on the central guide rod. The heating element is connected to an external circulating heating oil pump through an insulating interface of a flange. Insulating oil flows in the hollow spiral tube. The circulating heating oil pump heats the insulating oil and pumps the hot insulating oil to the central guide rod to heat the central guide rod.

[0013] The UHF-gas state fusion sensor is installed at the bottom hand hole of the GIS shell to obtain the temperature and relative humidity of the gas at the bottom of the GIS and obtain the UHF signal during discharge. The bottom hand hole is close to the condensation defect setting position.

[0014] Gas valve IN and gas valve OUT are arranged in the GIS housing and connected to the gas humidity control device W to circulate humidification or dry the SF6 gas inside the GIS housing.

[0015] A data display control panel is connected to the gas state multi-parameter sensing module, the platinum resistance temperature sensor, and the UHF-gas state fusion sensor to collect temperature, relative humidity, and UHF signals, and simultaneously communicates with the temperature control pad, the heating oil pump, and the gas humidity control device to control the temperature and humidity.

[0016] In the condensation test system for the pot-type insulator of the GIS equipment, the temperature control pad makes the actual temperature of the GIS shell equal to the set shell temperature and maintains it constant according to the actual temperature measured by the platinum resistance temperature sensor.

[0017] In the GIS equipment pot-type insulator condensation test system, the heating element includes a copper hollow tube sleeved on the central guide rod and an insulating nylon hollow tube connecting the copper hollow tube and the circulating heating oil pump.

[0018] In the condensation test system for the pot-type insulator of the GIS equipment, the condensation defect is set at the bottom of the pot-type insulator.

[0019] In the GIS equipment pot-type insulator condensation test system, the data display control panel includes a hardware circuit composed of MCU signals and a display screen.

[0020] In the condensation test system for the pot-type insulator of the GIS equipment, the material of the pot-type insulator is epoxy resin, and the thermal conductivity is smaller than the thermal conductivity of the aluminum alloy of the GIS shell.

[0021] The control method of the condensation test system for the pot-type insulator of GIS equipment includes the following steps:

[0022] The internal gas pressure in the GIS housing is adjusted to the actual equipment setting pressure, and the SF6 gas is a dry gas.

[0023] During the test, a set of tests is conducted starting from a low load simulating the operation of GIS, and then the load is gradually increased. The heating power is calculated through the loop resistance and circuit to set the temperature of the central guide rod.

[0024] If the shell temperature is set to the same, the overall temperature inside the GIS will be equal everywhere in steady state, and thus the relative humidity will also be equal everywhere.

[0025] Observe the data to show the temperature of the gas state multi-parameter sensor module and the UHF-gas state fusion sensor on the control panel. When the two temperatures are consistent, it is considered that the GIS has reached a steady state. If they are inconsistent, continue to wait until they are consistent.

[0026] After the temperature is consistent, calculate the relative humidity value.

[0027] The control data display control panel sends a gas humidification instruction to the gas humidity control device W to increase the gas humidity.

[0028] When the humidity of the gas state multi-parameter sensor module and the UHF-gas state fusion sensor are equal, it means that the steady state value has been reached.

[0029] Lowering the temperature of the GIS shell causes changes in the internal state, and the relative humidity at the bottom of the GIS shell gradually increases.

[0030] Wait for the UHF-gas state fusion sensor to measure the relative humidity to be close to 95% and then stop cooling. Keep the temperature to allow condensation to form.

[0031] Wait for half an hour to allow the internal state to stabilize, then conduct condensation-related tests and record the test data.

[0032] After the test is completed, send a dry gas command to the gas humidity control device W to completely dry the gas to avoid a large amount of condensation inside after cooling down and affect the next test. After drying, recycle the gas, close the shell and center guide rod temperature control devices, open the observation window to observe the surface discharge or flashover marks of the insulator to polish or replace the pot insulator.

[0033] In the method described, after the temperature is consistent, calculating the relative humidity value includes,

[0034] Read the initial set temperature T,

[0035] According to the formula Calculate the saturated water vapor pressure of the gas at this temperature.

[0036] Set the condensation temperature at the existing temperature T.

[0037] Calculate the saturated water vapor pressure at the condensation temperature,

[0038] The saturated water vapor pressure at the set condensation temperature is used as the water vapor pressure at the current temperature to calculate the relative humidity value.

[0039] In the method described, the condensation temperature is the current temperature minus 30 degrees Celsius.

[0040] In the method, the relative humidity of the drying gas is at least below 5%.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention completely simulates the real state of on-site GIS, ensures the reliability and validity of data, and can test multiple test data for partial discharge mechanism analysis and research. It solves the disadvantage of temperature uniformity of traditional small discharge models, and the overall temperature distribution on the insulating basin is close to the real value.

[0043] The above description is only an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and to achieve the extent that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of illustrating the preferred embodiments and are not considered to be limitations of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0045] In the attached picture:

[0046] Figure 1 It is a structural schematic diagram of a condensation test system for a basin-type insulator of a GIS device provided by an embodiment of the present invention;

[0047] Figure 2 is a schematic diagram of an interface of a data display control panel C provided by an embodiment of the present invention;

[0048] Figure 3 is a schematic diagram of temperature distribution of a pot-type insulator provided by an embodiment of the present invention;

[0049] Figure 4 It is a schematic diagram of SF6 gas temperature distribution provided by an embodiment of the present invention;

[0050] Figure 5 It is a schematic diagram of a method flow chart provided by an embodiment of the present invention;

[0051] Figure 6 It is a schematic diagram of a process for obtaining relative humidity provided by an embodiment of the present invention.

[0052] The present invention is further explained below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0053] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0054] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0055] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0056] For a better understanding, Figures 1 to 6 As shown, a GIS equipment pot insulator condensation test system includes:

[0057] The real GIS test platform 1 includes a GIS shell and a central guide rod arranged in the GIS shell; the real one is to install the GIS in accordance with the structural size layout of the substation, but only shorten the length of the GIS cavity without changing other parts, so that the test results are consistent with the on-site results, which can provide a more effective reference for on-site diagnosis.

[0058] A digital pressure gauge 2, which is arranged on the GIS housing and is used to measure the gas pressure inside the GIS;

[0059] The gas state multi-parameter sensor module 3 is installed at the top hand hole of the GIS shell to measure the temperature and relative humidity of the gas on the top of the GIS;

[0060] The temperature control pad 6 completely wraps the GIS shell area to simulate the temperature distribution state formed by the temperature difference between the inside and outside during the actual GIS operation and is used to control the temperature to form condensation; further, the temperature control pad 6 completely wraps the GIS test section shell area.

[0061] A platinum resistance temperature sensor 4 is arranged on the surface of the GIS shell to measure the actual temperature of the GIS shell.

[0062] The heating element 5 is a hollow spiral tube installed on the central guide rod. The heating element 5 is connected to an external circulating heating oil pump 8 through an insulating interface of a flange. Insulating oil flows in the hollow spiral tube. The circulating heating oil pump 8 heats the insulating oil and pumps the hot insulating oil to the central guide rod to heat the central guide rod.

[0063] The UHF-gas state fusion sensor 7 is installed at the bottom hand hole of the GIS shell to obtain the temperature and relative humidity of the gas at the bottom of the GIS and obtain the UHF signal during discharge. The bottom hand hole is close to the condensation defect setting position.

[0064] Gas valve IN and gas valve OUT are arranged in the GIS housing and connected to the gas humidity control device W to circulate humidification or dry the SF6 gas inside the GIS housing.

[0065] The data display control panel C is connected to the gas state multi-parameter sensing module 3, the platinum resistance temperature sensor 4, and the UHF-gas state fusion sensor 7 to collect temperature, relative humidity, and UHF signals, and at the same time communicates with the temperature control pad 6, the heating oil pump, and the gas humidity control device to control the temperature and humidity.

[0066] In a preferred embodiment of the condensation test system for pot-type insulators of GIS equipment, the temperature control pad 6 makes the actual temperature of the GIS shell equal to the set shell temperature and maintains it constant according to the actual temperature measured by the platinum resistance temperature sensor 4.

[0067] In the preferred embodiment of the GIS equipment pot insulator condensation test system, the heating element 5 includes a copper hollow tube sleeved on the central guide rod and an insulating nylon hollow tube connecting the copper hollow tube and the circulating heating oil pump 8.

[0068] In the preferred embodiment of the GIS equipment pot insulator condensation test system, the condensation defect is set at the bottom of the pot insulator. The pot insulator is a device connecting two sections of GIS.

[0069] In a preferred embodiment of the GIS equipment pot insulator condensation test system, the data display control panel includes a hardware circuit composed of MCU signals and a display screen.

[0070] In a preferred embodiment of the condensation test system for pot-type insulators of GIS equipment, the material of the pot-type insulator is epoxy resin, and the thermal conductivity is smaller than the thermal conductivity of the aluminum alloy of the GIS shell.

[0071] The control method of the condensation test system for the pot-type insulator of GIS equipment includes the following steps:

[0072] The internal gas pressure in the GIS housing is adjusted to the actual equipment setting pressure, and the SF6 gas is a dry gas.

[0073] During the test, a set of tests is conducted starting from a low load simulating the operation of GIS, and then the load is gradually increased. The heating power is calculated through the loop resistance and circuit to set the temperature of the central guide rod.

[0074] If the shell temperature is set to the same, the overall temperature inside the GIS will be equal everywhere in steady state, and thus the relative humidity will also be equal everywhere.

[0075] Observe the data to show the temperature of the gas state multi-parameter sensor module and the UHF-gas state fusion sensor on the control panel. When the two temperatures are consistent, it is considered that the GIS has reached a steady state. If they are inconsistent, continue to wait until they are consistent.

[0076] After the temperature is consistent, calculate the relative humidity value.

[0077] The control data display control panel sends a gas humidification instruction to the gas humidity control device W to increase the gas humidity.

[0078] When the humidity of the gas state multi-parameter sensor module and the UHF-gas state fusion sensor are equal, it means that the steady state value has been reached.

[0079] Lowering the temperature of the GIS shell causes changes in the internal state, and the relative humidity at the bottom of the GIS shell gradually increases.

[0080] Wait for the UHF-gas state fusion sensor to measure the relative humidity to be close to 95% and then stop cooling. Keep the temperature to allow condensation to form.

[0081] Wait for half an hour to allow the internal state to stabilize, then conduct condensation-related tests and record the test data.

[0082] After the test is completed, send a dry gas command to the gas humidity control device W to completely dry the gas to avoid a large amount of condensation inside after cooling down and affect the next test. After drying, recycle the gas, close the shell and center guide rod temperature control devices, open the observation window to observe the surface discharge or flashover marks of the insulator to polish or replace the pot insulator.

[0083] In a preferred embodiment of the method, after the temperatures are consistent, calculating the relative humidity value includes:

[0084] Read the initial set temperature T,

[0085] According to the formula Calculate the saturated water vapor pressure of the gas at this temperature.

[0086] Set the condensation temperature at the existing temperature T.

[0087] Calculate the saturated water vapor pressure at the condensation temperature,

[0088] The saturated water vapor pressure at the set condensation temperature is used as the water vapor pressure at the current temperature to calculate the relative humidity value.

[0089] In a preferred embodiment of the method, the condensation temperature is the existing temperature minus 30 degrees Celsius.

[0090] In a preferred embodiment of the method, the relative humidity of the drying gas is at least below 5%.

[0091] In one embodiment, Figure 1In the figure, the real GIS test platform 1 is a cross-sectional view in the XZ direction, where the Z direction is the gravity direction and the XY plane is parallel to the ground; the digital pressure gauge 2 is connected to the GIS shell to measure the gas pressure inside the GIS; the gas state multi-parameter sensor module 3 is installed at the hand hole position after reliable electromagnetic shielding measures, and is used to measure the temperature, relative humidity and other parameters of the gas on the top of the GIS; the temperature control pad 6 completely wraps the shell area of ​​the GIS test section, which can simulate the temperature distribution state formed by the temperature difference between the inside and outside during the actual GIS operation, and is used to control the temperature to form condensation; there is also a platinum resistance temperature sensor 4 on the surface of the shell to measure the actual temperature of the shell, so as to dynamically adjust the temperature of the temperature control pad 6 to ensure that the actual shell temperature is equal to the set shell temperature and maintain constant. A heating element 5 formed by a hollow spiral tube is installed on the central guide rod of the GIS equipment, which is connected to the external circulating heating oil pump 8 through the insulating interface of the flange. Insulated transformer oil flows in the tube, and the circulating oil pump heats the insulating oil and pumps the hot insulating oil to the central guide rod to heat the central guide rod. A UHF-gas state fusion sensor 7 is installed at the hand hole position at the bottom of the GIS shell. On the one hand, it is used to obtain the temperature and relative humidity of the gas at the bottom of the GIS, and on the other hand, it can obtain the UHF signal during discharge. The hand hole position is close to the condensation defect setting position, which can facilitate the setting of defects and observation of defect positions; the condensation defect setting position is located at the bottom of the pot insulator, because the condensation phenomenon first appears here, which is convenient for controlling variables. There are also two gas valves IN and OUT on the GIS connected to the gas humidity control device W, which can circulate humidification or dry the SF6 gas inside the GIS to provide corresponding humidity conditions for the generation of condensation.

[0092] Figure 2 The data shown shows that the control panel C is a hardware circuit composed of the underlying MCU signals, which can collect signals from the gas state multi-parameter sensor module 3 as module 1 and the shell temperature-sensitive platinum resistor, and communicate with the temperature control pad 6, heating oil pump and gas humidity control device of the GIS shell to control the temperature and humidity of each sub-equipment; the panel can display the temperature, relative humidity and dew point of the top gas state multi-parameter sensor module 3, the temperature, relative humidity and dew point of the bottom UHF-gas state fusion sensor 7 as module 2, the center guide rod temperature and the shell temperature; the data display control panel C can set the center guide rod temperature, shell temperature and relative humidity.

[0093] Figure 3 and Figure 4The diagram shows the temperature distribution of the pot insulator and SF6 gas in a normally operating GIS. The temperature distribution of the pot insulator decreases from the guide rod to the outside in an approximately circular shape. In the opposite direction of gravity, the temperature of the upper part of the pot insulator is slightly distorted due to the existence of high-temperature rising airflow, so the upper temperature is also slightly higher than the lower temperature. The temperature of the SF6 gas shows a certain stratification phenomenon, with low temperature at the bottom and high temperature at the top. The internal pressure of the closed GIS is equal everywhere. According to Dalton's law of partial pressure, the partial pressure of water vapor is also equal everywhere. Therefore, the relative humidity of the area with low temperature at the bottom is higher, and condensation will occur first. The material of the pot-type insulator is epoxy resin, and its thermal conductivity is much smaller than that of the aluminum alloy shell. Therefore, the high temperature area is only concentrated in the vicinity of the contact with the contact, and the heat transfer ability to the outside is weak. However, because the surface heat transfer coefficient of epoxy resin is smaller than that of aluminum alloy, and the heat exchanged with the air is less, the temperature of the outer surface of the insulator is higher than that of the GIS shell. At this time, if the temperature of the outer surface of the insulator is controlled to be the same as that of the shell, the temperature at the bottom area will be lower than that of the inner surface of the shell. At this time, condensation will occur preferentially in the bottom area, thereby realizing the control of the condensation occurrence position, and will not introduce condensation in other areas to affect the test results.

[0094] like Figure 5 The control method for the condensation test of the pot insulator of the real GIS equipment shown includes:

[0095] After the test starts, observe all the data on the display panel. At this time, the internal air pressure of the GIS should be consistent with the actual equipment setting air pressure, the gas should be dry gas, and the relative humidity should be at least below 5%.

[0096] Different loads during GIS operation will produce different heating powers and ultimately lead to different center guide rod temperatures. Therefore, during the test, a set of tests can be started by simulating a lower load, and then the load can be gradually increased. The test equipment cannot apply current to restore the actual load, so the heating power is calculated through the loop resistance and circuit to set the approximate center guide rod temperature.

[0097] If the same shell temperature is set, the overall temperature inside the GIS will be equal everywhere when waiting for steady state, and the relative humidity will also be equal everywhere. Unpredictable local condensation will not occur in the subsequent gas humidification process, which is not conducive to the control of the condensation test position.

[0098] Observe the temperature of module 1 and module 2 on the display control module. The two modules are located at the top and bottom. When the temperatures of the two modules are basically consistent, it can be considered that the GIS has reached a steady state. If not, continue to wait until they are consistent.

[0099] After the temperature is consistent, the relative humidity will not be inconsistent when the gas is humidified. Figure 2The data conversion process sets the relative humidity value.

[0100] Read the initial set temperature T,

[0101] According to the formula Calculate the saturated water vapor pressure of the gas at this temperature.

[0102] The condensation temperature T1 is set at the existing temperature. Considering the actual working conditions and the convenience of implementation, the condensation temperature is set to the existing temperature minus 30 degrees Celsius.

[0103] Calculate the saturated water vapor pressure at condensation temperature T1 .

[0104] The saturated water vapor pressure at the set condensation temperature is used as the water vapor pressure at the current temperature to calculate the relative humidity value. Enter the calculated relative humidity value in the control panel. .

[0105] The control panel sends a gas humidification instruction to the gas circulation device, and the gas circulation device works to slowly increase the gas humidity.

[0106] At present, the temperature inside the GIS equipment is equal everywhere. The humidified gas diffuses slowly after entering. When the relative humidity displayed by module 1 and module 2 is approximately equal, it means that the steady-state value is reached.

[0107] Slowly lowering the shell temperature causes the internal state to change and the relative humidity at the bottom of the GIS to gradually increase.

[0108] Wait until module 2 measures that the relative humidity is close to 95% before stopping cooling and maintaining the temperature. At this time, condensation has basically occurred because the temperature at the bottom of the pot-type insulator is lower than the shell temperature.

[0109] Wait for half an hour for the internal state to stabilize and then carry out condensation-related tests and record the relevant test data.

[0110] After the test is completed, it is necessary to send a dry gas command to the gas circulation device to completely dry the gas to avoid a large amount of condensation inside after cooling down and affect the next test. After drying, the gas is recovered, the outer shell and the center guide rod temperature control device are closed, and the observation window is opened to observe the surface discharge or flashover marks of the insulator. The pot insulator should be polished or replaced according to the situation.

[0111] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0112] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A GIS equipment pot insulator condensation test system, characterized in that: These include, A real GIS test platform, which includes a GIS shell and a central guide rod arranged in the GIS shell; A digital pressure gauge, which is arranged on the GIS housing and is used to measure the gas pressure inside the GIS; The gas state multi-parameter sensor module is installed at the top hand hole of the GIS shell to measure the temperature and relative humidity of the gas on the top of the GIS; Temperature control pads, which completely wrap the GIS shell area to simulate the temperature distribution state formed by the temperature difference between the inside and outside during the actual GIS operation and are used to control the temperature to form condensation; A platinum resistance temperature sensor is arranged on the surface of the GIS housing to measure the actual temperature of the GIS housing. The heating element is a hollow spiral tube installed on the central guide rod. The heating element is connected to an external circulating heating oil pump through an insulating interface of a flange. Insulating oil flows in the hollow spiral tube. The circulating heating oil pump heats the insulating oil and pumps the hot insulating oil to the central guide rod to heat the central guide rod. The UHF-gas state fusion sensor is installed at the bottom hand hole of the GIS shell to obtain the temperature and relative humidity of the gas at the bottom of the GIS and obtain the UHF signal during discharge. The bottom hand hole is close to the condensation defect setting position. Gas valve IN and gas valve OUT are arranged in the GIS housing and connected to the gas humidity control device W to circulate humidification or dry the SF6 gas inside the GIS housing. A data display control panel is connected to the gas state multi-parameter sensing module, the platinum resistance temperature sensor, and the UHF-gas state fusion sensor to collect temperature, relative humidity, and UHF signals, and simultaneously communicates with the temperature control pad, the heating oil pump, and the gas humidity control device to control the temperature and humidity.

2. The GIS equipment pot insulator condensation test system according to claim 1, characterized in that: Preferably, the temperature control pad makes the actual temperature of the GIS shell equal to the set shell temperature and maintains it constant according to the actual temperature measured by the platinum resistance temperature sensor.

3. The GIS equipment pot insulator condensation test system according to claim 1, characterized in that: The heating element comprises a copper hollow tube sleeved on a central guide rod and an insulating nylon hollow tube connecting the copper hollow tube and a circulating heating oil pump.

4. The GIS equipment pot insulator condensation test system according to claim 1, characterized in that: The condensation defect is set at the bottom of the pot insulator.

5. The GIS equipment pot insulator condensation test system according to claim 1, characterized in that: The data display control panel includes a hardware circuit composed of MCU signals and a display screen.

6. The GIS equipment pot insulator condensation test system according to claim 1, characterized in that: The material of the pot insulator is epoxy resin, and its thermal conductivity is lower than that of the aluminum alloy of the GIS shell.

7. The control method of the GIS equipment pot insulator condensation test system according to any one of claims 1 to 6, characterized in that: It includes the following steps, The internal gas pressure in the GIS housing is adjusted to the actual equipment setting pressure, and the SF6 gas is a dry gas. During the test, a set of tests is conducted starting from a low load simulating the operation of GIS, and then the load is gradually increased. The heating power is calculated through the loop resistance and circuit to set the temperature of the central guide rod. If the shell temperature is set to the same, the overall temperature inside the GIS will be equal everywhere in steady state, and thus the relative humidity will also be equal everywhere. Observe the data to show the temperature of the gas state multi-parameter sensor module and the UHF-gas state fusion sensor on the control panel. When the two temperatures are consistent, it is considered that the GIS has reached a steady state. If they are inconsistent, continue to wait until they are consistent. After the temperature is consistent, calculate the relative humidity value. The control data display control panel sends a gas humidification instruction to the gas humidity control device W to increase the gas humidity. When the humidity of the gas state multi-parameter sensor module and the UHF-gas state fusion sensor are equal, it means that the steady state value has been reached. Lowering the temperature of the GIS shell causes changes in the internal state, and the relative humidity at the bottom of the GIS shell gradually increases. Wait for the UHF-gas state fusion sensor to measure the relative humidity to be close to 95% and then stop cooling. Keep the temperature to allow condensation to form. Wait for half an hour to allow the internal state to stabilize, then conduct condensation-related tests and record the test data. After the test is completed, send a dry gas command to the gas humidity control device W to completely dry the gas to avoid a large amount of condensation inside after cooling down and affect the next test. After drying, recycle the gas, close the shell and center guide rod temperature control devices, open the observation window to observe the surface discharge or flashover marks of the insulator to polish or replace the pot insulator.

8. The method according to claim 7, characterized in that After the temperature is consistent, the relative humidity value is calculated including, Read the initial set temperature T, According to the formula Calculate the saturated water vapor pressure of the gas at this temperature. Set the condensation temperature at the existing temperature T. Calculate the saturated water vapor pressure at the condensation temperature, The saturated water vapor pressure at the set condensation temperature is used as the water vapor pressure at the current temperature to calculate the relative humidity value.

9. The method according to claim 8, characterized in that The condensation temperature is the current temperature minus 30 degrees Celsius.

10. The method according to claim 7, characterized in that The relative humidity of the drying gas should be at least below 5%.

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