Phase-isolated enclosed busbar micro-positive pressure device and control method thereof

Abstract

The invention provides an isolated-phase enclosed bus micro-positive voltage device and a control method thereof, relates to the technical field of electric power system enclosed buses, and solves the problems of limitation of energy consumption, service life and the like in the aspects of the structure and the control strategy of an existing device. The device comprises a freezing dryer connected with each phase of bus of the isolated-phase enclosed bus, and further comprises an industrial control all-in-one machine, and a gas pressure sensor is arranged in each phase of bus; the industrial control all-in-one machine is in communication connection with the freezing dryer and the gas pressure sensor; each phase of bus is connected to the refrigeration dryer through an inflation electromagnetic valve, and the industrial control all-in-one machine is in communication connection with all the inflation electromagnetic valves; the industrial control all-in-one machine receives the gas pressure data in the bus of the corresponding phase, and when the gas pressure data is lower than the lower limit of a preset pressure value, the freezing dryer and an inflation electromagnetic valve of the bus of the corresponding phase are controlled to be opened, and dry air is inflated into the bus of the corresponding phase; the operation time of the refrigeration dryer and the matched compressor can be effectively shortened, the service life is prolonged, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of closed busbars in power systems, and in particular to a phase-isolated closed busbar micro-positive pressure device and a control method thereof. Background Art

[0002] Phase-separated enclosed busbars have been widely used in large power plants. This type of busbar is designed with an independent metal shell for each phase, and the metal shells between the phases are isolated from each other by a certain gap, thus forming a relatively sealed space. Such a structure can not only effectively improve the efficiency of power transmission, but also significantly enhance the safety and reliability of the system. However, in actual operation, due to the influence of external environmental factors, such as temperature changes causing moisture in the internal air to condense into dew, the electrical insulation performance of the enclosed busbar may be reduced, thereby affecting the stable operation of the entire power system.

[0003] In order to solve the above problems, a micro-positive pressure device is usually installed in the phase-isolated closed busbar system. Its main function is to continuously fill the closed busbar with dry air, thereby maintaining a small positive pressure state slightly higher than the external atmospheric pressure. The purpose of this is to prevent external humid air and impurities such as dust from entering the closed busbar cavity, avoiding the decrease in electrical insulation level caused by increased humidity. However, most of the common micro-positive pressure devices on the market currently use a design scheme that uses a set of charging equipment for three phases. Although this configuration simplifies the system structure and reduces the initial investment cost, it also brings some potential problems.

[0004] Specifically, when a phase needs to adjust the internal air pressure, the micro-positive pressure device shared by the entire three phases will start working, even if the other two phases may not need to be inflated at this time, but they will still be inflated. This will cause the micro-positive pressure device to be frequently opened and closed, increasing the degree of wear of mechanical parts and having a certain impact on the service life of the equipment. In addition, frequent start and stop may also cause the failure rate of the control system to increase, increase maintenance difficulty and operating costs. Therefore, it is particularly important to develop a new generation of micro-positive pressure devices and control strategies that can meet the moisture-proof requirements of isolated closed busbars, reduce unnecessary energy consumption, and extend service life. Those skilled in the art have made how to achieve more efficient and reliable device operation effects the focus of current research. Summary of the invention

[0005] Based on the current status of the background technology, the purpose of the present invention is to solve the limitations of the existing micro-positive pressure devices in terms of structure and control strategy, such as energy consumption and service life. Therefore, a phase-isolated closed bus micro-positive pressure device and its control method are proposed. The present invention samples the temperature, humidity and pressure values ​​inside each phase of the phase-isolated closed bus through an industrial control all-in-one machine, and opens or closes the corresponding inflation solenoid valve according to demand, combined with whether the power supply of the cold dryer is connected or not, to achieve the control of the micro-positive pressure device. The present invention can effectively reduce the operating time of the cold dryer and the matching compressor, extend the service life and save energy consumption.

[0006] The present invention adopts the following technical solutions to achieve the purpose:

[0007] A micro-positive pressure device for an isolated phase closed bus, the device comprising a cold dryer connected to each phase bus of the isolated phase closed bus; the device also comprises an industrial control all-in-one computer, and a gas pressure sensor is correspondingly arranged in each phase bus; the industrial control all-in-one computer is communicatively connected with the cold dryer and all the gas pressure sensors; each phase bus is connected to the cold dryer through an independent inflation solenoid valve, and the industrial control all-in-one computer is communicatively connected with all the inflation solenoid valves; the industrial control all-in-one computer is used to receive gas pressure data in the corresponding phase bus fed back from the gas pressure sensor, and when the gas pressure data is lower than the lower limit of the preset pressure value, controls the inflation solenoid valve of the corresponding phase bus to open, and controls the cold dryer to open at the same time, and fills the corresponding phase bus with dry air.

[0008] Preferably, a temperature and humidity sensor is also provided in each phase bus, and the industrial control all-in-one computer is communicatively connected with all the temperature and humidity sensors; the industrial control all-in-one computer is also used to receive the temperature and humidity data in the corresponding phase bus fed back from the temperature and humidity sensor, and when the temperature data therein is lower than the preset temperature value lower limit, or the humidity data therein is higher than the preset humidity value upper limit, the inflation solenoid valve of the corresponding phase bus is controlled to open, and at the same time the cold dryer is controlled to open to fill the corresponding phase bus with dry air.

[0009] Furthermore, the cold dryer is also connected to the gas tank through a first solenoid valve, and the industrial control all-in-one computer is communicatively connected to the first solenoid valve; the industrial control all-in-one computer is also used to control the opening of the first solenoid valve while controlling the opening of the cold dryer.

[0010] Preferably, the gas tank is connected to the compressor via a second solenoid valve, and the industrial control integrated machine is communicatively connected to the second solenoid valve and the compressor respectively.

[0011] Furthermore, the gas tank is equipped with an in-tank pressure sensor, and the industrial control all-in-one computer is communicatively connected to the in-tank pressure sensor; the industrial control all-in-one computer is also used to receive the internal pressure data of the gas tank fed back from the in-tank pressure sensor, and when the internal pressure data of the gas tank is lower than the preset lower limit of the in-tank pressure value, control the second solenoid valve to open, and at the same time control the compressor to start, to fill compressed air into the gas tank; the industrial control all-in-one computer is also used to close the second solenoid valve and the compressor when the internal pressure data of the gas tank reaches the preset upper limit of the in-tank pressure value.

[0012] The present invention also provides a control method for a phase-isolated enclosed busbar micro-positive pressure device, the hardware basis of the method is the aforementioned phase-isolated enclosed busbar micro-positive pressure device; the method includes a gas tank inflation automatic control process and a phase-isolated enclosed busbar inflation automatic phase-separation control process running simultaneously;

[0013] During the automatic control process of gas tank inflation, the industrial control integrated computer collects the internal pressure data of the gas tank in real time; when the internal pressure data of the gas tank is lower than the preset lower limit of the tank pressure value, the second solenoid valve and the compressor are opened to fill the gas tank with compressed air; when the internal pressure data of the gas tank reaches the preset upper limit of the tank pressure value, the second solenoid valve and the compressor are closed;

[0014] During the automatic phase-separation control process of inflation of the phase-isolated closed bus, the industrial control integrated computer collects the gas pressure data and temperature and humidity data of each phase bus of the phase-isolated closed bus in real time; when the gas pressure data of any phase bus is lower than the preset pressure lower limit, or the temperature data in the temperature and humidity data is lower than the preset temperature lower limit, or the humidity data in the temperature and humidity data is higher than the preset humidity upper limit, the inflation solenoid valve of the corresponding phase bus is opened, and the cold dryer is turned on at the same time; when the gas pressure data and temperature and humidity data of each phase bus collected in real time are within the preset value range, the cold dryer and all the inflation solenoid valves are closed.

[0015] In summary, due to the adoption of this technical solution, the beneficial effects of the present invention are as follows:

[0016] The present invention realizes more accurate and efficient micro-positive pressure management. The micro-positive pressure device can independently adjust its internal environment according to the actual needs of each phase of the closed busbar, avoiding the mechanical wear and control system failure caused by frequent startup of the traditional three-phase common charging device. In addition, the high-pressure gas tank is equipped with a special charging solenoid valve, which can automatically determine whether the compressor is running according to the current pressure value of the gas tank, thereby further optimizing the energy utilization efficiency of the entire device.

[0017] Through the above design, the present invention not only significantly reduces the unnecessary operating time of the cold dryer and compressor, and prolongs the service life of these key components, but also greatly reduces the energy consumption of the entire device. This not only helps to reduce the operating cost of the power system, but also improves the reliability and maintenance convenience of the equipment; the solution of the present invention thus has good practical value and promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the hardware connection structure of the micro positive pressure device of the present invention;

[0019] Figure 2 It is a schematic diagram of electrical control connection of the micro positive pressure device of the present invention;

[0020] Figure 3 It is a control logic diagram of the compressor in the micro positive pressure device of the present invention;

[0021] Figure 4 It is a logical diagram of the phase-separated control of the isolated closed busbar of the micro positive pressure device of the present invention.

[0022] The meanings of the symbols in the accompanying drawings are as follows:

[0023] 1- cold dryer, 2- industrial control integrated machine, 3- gas pressure sensor, 4- charging solenoid valve, 5- A phase bus, 6- B phase bus, 7- C phase bus, 8- temperature and humidity sensor, 9- first solenoid valve, 10- gas tank, 11- manual pressure regulating valve, 12- manual air release valve, 13- second solenoid valve, 14- compressor, 15- tank internal pressure sensor. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] like Figure 1As shown, a phase-isolated closed bus micro-positive pressure device includes a cold dryer 1 connected to each phase bus of the phase-isolated closed bus, and an industrial control all-in-one computer 2, and a gas pressure sensor 3 is also correspondingly arranged in each phase bus; the industrial control all-in-one computer 2 is communicatively connected with the cold dryer 1 and all the gas pressure sensors 3; each phase bus is connected to the cold dryer 1 through an independent inflation solenoid valve 4, and the industrial control all-in-one computer 2 is communicatively connected with all the inflation solenoid valves 4; the industrial control all-in-one computer 2 is used to receive the gas pressure data in the corresponding phase bus fed back from the gas pressure sensor 3, and when the gas pressure data is lower than the lower limit of the preset pressure value, control the inflation solenoid valve 4 of the corresponding phase bus to open, and at the same time control the cold dryer 1 to open, and fill the corresponding phase bus with dry air.

[0028] The characteristic of this embodiment is that each phase bus is equipped with an independent inflation solenoid valve 4, which is essential to improve the flexibility and reliability of the entire device. In this embodiment, the cold dryer 1 is responsible for providing air that has been cooled and dried, and the industrial control all-in-one machine 2 is the brain of the entire device, which determines when to start or stop the inflation process in a given phase through a preset pressure value range. The inflation solenoid valve 4 independently configured for each phase means that when the pressure on a particular phase line is lower than the set threshold, only the phase needs to be inflated without affecting other parts that work normally; this not only allows more precise control of the air pressure conditions in each phase line, but also saves energy consumption, because there is no need to perform unnecessary inflation and pressurization steps in all phase-isolated closed buses controlled by the entire device.

[0029] In this embodiment, the industrial control integrated machine 2 is preferably an industrial control integrated machine with a touch screen, which is convenient for control and data display. In addition, the phase-isolated closed busbar used in the micro-positive pressure device of this embodiment includes A-phase busbar 5, B-phase busbar 6 and C-phase busbar 7, and the inflation solenoid valve 4 includes A-phase inflation solenoid valve, B-phase inflation solenoid valve and C-phase inflation solenoid valve; A-phase busbar 5 is connected to the cold dryer 1 through the A-phase inflation solenoid valve, B-phase busbar 6 is connected to the cold dryer 1 through the B-phase inflation solenoid valve, and C-phase busbar 7 is connected to the cold dryer 1 through the C-phase inflation solenoid valve; the industrial control integrated machine 2 is respectively connected to the A-phase inflation solenoid valve, the B-phase inflation solenoid valve and the C-phase inflation solenoid valve.

[0030] Example 2

[0031] Based on Example 1, this example introduces the micro-positive pressure device. Figure 1As shown in the figure, a temperature and humidity sensor 8 is also provided in each phase bus, and the industrial control integrated machine 2 is communicatively connected with all the temperature and humidity sensors 8; the industrial control integrated machine 2 is also used to receive the temperature and humidity data in the corresponding phase bus fed back from the temperature and humidity sensor 8, and when the temperature data therein is lower than the lower limit of the preset temperature value, or the humidity data therein is higher than the upper limit of the preset humidity value, the inflation solenoid valve 4 of the corresponding phase bus is controlled to open, and at the same time, the cold dryer 1 is controlled to open to fill the corresponding phase bus with dry air.

[0032] The introduction of the temperature and humidity sensor 8 makes the function of the micro-positive pressure device more comprehensive and intelligent, which not only enhances the monitoring capability of the internal environmental conditions of the busbar, but also improves the response speed and adaptability of the entire device; on this basis, the industrial control integrated machine 2 can simultaneously receive information about air pressure, temperature and humidity, providing a basis for more accurate judgment of the current state. The advantage of doing so is that it can quickly respond to any situation that may threaten the safe operation of the equipment, avoiding corrosion problems caused by excessive humidity or condensation caused by low temperature.

[0033] Maintaining appropriate temperature and humidity levels inside the isolated phase enclosed busbar is essential to ensure good electrical insulation performance. Excessive humidity may also cause short circuit risks, while extreme low temperatures may even cause material shrinkage and cracking; the operation of the cold dryer 1 can alleviate these risks to a certain extent, while providing the basic conditions for configuring additional auxiliary equipment. Therefore, this type of structure and adjustment mechanism of the present embodiment helps to extend the service life of the micro-positive pressure device and the isolated phase enclosed busbar and reduce the probability of failure.

[0034] Example 3

[0035] On the basis of Example 1 or 2, Figure 1 As shown, the cold dryer 1 in this embodiment is also connected to the gas tank 10 through the first solenoid valve 9, and the industrial control all-in-one computer 2 is communicatively connected with the first solenoid valve 9; the industrial control all-in-one computer 2 is also used to control the opening of the first solenoid valve 9 while controlling the opening of the cold dryer 1.

[0036] In addition, a manual pressure regulating valve 11 is provided on the connection line between the first solenoid valve 9 and the cold dryer 1, and a manual air release valve 12 is connected to the gas tank 10. The gas tank 10 is also connected to a compressor 14 through a second solenoid valve 13, and the industrial control integrated machine 2 is respectively connected to the second solenoid valve 13 and the compressor 14 in communication.

[0037] A further preferred method is: the gas tank 10 is equipped with an internal tank pressure sensor 15, and the industrial control all-in-one computer 2 is communicatively connected with the internal tank pressure sensor 15; the industrial control all-in-one computer 2 is also used to receive the internal tank pressure data fed back from the internal tank pressure sensor 15, and when the internal tank pressure data is lower than the preset lower limit of the tank pressure value, control the second solenoid valve 13 to open, and at the same time control the compressor 14 to open, and fill the gas tank with compressed air; the industrial control all-in-one computer 2 is also used to close the second solenoid valve 13 and the compressor 14 when the internal tank pressure data reaches the preset upper limit of the tank pressure value.

[0038] In this embodiment, the gas tank 10 is a container for storing compressed air, so as to ensure that there is enough gas source to meet the operation of the cold dryer 1 and the gas charging requirements of each phase bus. The compressor 14 is responsible for generating high-pressure gas and sending the compressed high-pressure gas into the gas tank 10 through the second solenoid valve 13. The first solenoid valve 9 is dedicated to being automatically controlled by the industrial control integrated machine 2 to adjust the gas flow from the gas tank 10 to the cold dryer 1.

[0039] The manual pressure regulating valve 11 is located on the pipeline between the first solenoid valve 9 and the cold dryer 1, and allows the operator to manually adjust the parameters such as the gas flow rate or pressure before entering the cold dryer 1 as needed. The manual air release valve 12 can be directly installed on the gas tank 10, which provides a manual way to quickly release the internal pressure of the gas tank 10, and is usually used for pressure relief during maintenance or in emergency situations.

[0040] This embodiment further improves the reliability and flexibility of the device by managing and utilizing the pressure of the gas tank 10, can better adapt to the operation requirements under different environmental conditions, provides basic hardware conditions for energy consumption regulation, and enhances the overall safety performance.

[0041] Example 4

[0042] Based on the above embodiments, this embodiment combines Figure 1 and Figure 2 , showing the electrical connection characteristics of the micro positive pressure device. Figure 2 As shown, the industrial control all-in-one machine 2 is respectively connected to the relays of the cold dryer 1, the compressor 14, the first solenoid valve 9, the second solenoid valve 13 and all the inflation solenoid valves 4. The industrial control all-in-one machine 2 controls whether the corresponding switch contacts are closed by controlling whether the relays are energized, thereby controlling whether the corresponding equipment or solenoid valves are opened.

[0043] Figure 2The relay K1 in the circuit corresponds to whether the second solenoid valve 13 is on or off, and the relay K2 corresponds to whether the first solenoid valve 9 is on or off; the relays K3 to K5 correspond to whether the charging solenoid valve 4 of the A-phase to C-phase busbars is on or off. In addition, the industrial control integrated machine 2 also determines whether the power supply of the compressor 14 and the cold dryer 1 is on or off through the relays K6 and K7, thereby realizing the start and stop control of the corresponding equipment.

[0044] In this embodiment, the industrial control integrated machine 2 takes power from any phase of the three-phase AC power supply to realize its own power supply. The power supply of the tank pressure sensor 15, the gas pressure sensor 3 and the temperature and humidity sensor 8 can be realized through the converted DC24V power supply, and the communication between the three and the industrial control integrated machine 2 can be realized through the RS485 communication line. The power supply of the compressor 14 and the cold dryer 1 can be a three-phase AC power supply.

[0045] Example 5

[0046] On the basis of the above embodiments, this embodiment provides a control method for a phase-isolated enclosed busbar micro-positive pressure device, the hardware basis of which is the phase-isolated enclosed busbar micro-positive pressure device introduced in the previous embodiments. The control method includes a gas tank inflation automatic control process and a phase-isolated enclosed busbar inflation automatic phase-separated control process running simultaneously.

[0047] Synchronous viewing Figure 3 As described, during the automatic control process of gas tank inflation, the industrial computer 2 collects the internal pressure data of the gas tank in real time through the internal pressure sensor 15; when the internal pressure data of the gas tank is lower than the preset lower limit of the internal pressure value of the tank, the industrial computer 2 opens the second solenoid valve 13 and the compressor 14 through the corresponding relays to fill the gas tank with compressed air; when the internal pressure data of the gas tank reaches the preset upper limit of the internal pressure value of the tank, the industrial computer 2 closes the second solenoid valve 13 and the compressor 14.

[0048] Synchronous viewing Figure 4 As described, during the automatic phase-separated control process of inflation of the phase-isolated closed bus, the industrial control all-in-one machine 2 collects the gas pressure data and temperature and humidity data of each phase bus of the phase-isolated closed bus in real time through the gas pressure sensor 3 and the temperature and humidity sensor 8; when the gas pressure data of any phase bus is lower than the preset pressure lower limit, or the temperature data in the temperature and humidity data is lower than the preset temperature lower limit, or the humidity data in the temperature and humidity data is higher than the preset humidity upper limit, the industrial control all-in-one machine 2 opens the inflation solenoid valve 4 of the corresponding phase bus through the corresponding relay, and turns on the cold dryer 1 at the same time; when the gas pressure data and temperature and humidity data of each phase bus collected in real time by the industrial control all-in-one machine 2 are within the preset value range, the industrial control all-in-one machine 2 closes the cold dryer 1 and all the inflation solenoid valves 4.

Claims

1. A phase-isolated closed busbar micro-positive pressure device, the device comprising a cold dryer (1) connected to each phase busbar of the phase-isolated closed busbar; characterized in that: The device further comprises an industrial control integrated machine (2), and a gas pressure sensor (3) is correspondingly arranged in each phase bus; the industrial control integrated machine (2) is communicatively connected with the cold dryer (1) and all the gas pressure sensors (3); each phase bus is connected to the cold dryer (1) via an independent gas charging solenoid valve (4), and the industrial control integrated machine (2) is communicatively connected with all the gas charging solenoid valves (4); the industrial control integrated machine (2) is used to receive gas pressure data in the corresponding phase bus fed back from the gas pressure sensor (3), and when the gas pressure data is lower than a preset pressure lower limit, controls the gas charging solenoid valve (4) of the corresponding phase bus to open, and simultaneously controls the cold dryer (1) to open, so as to charge dry air into the corresponding phase bus.

2. The isolated phase enclosed busbar micro-positive pressure device according to claim 1 is characterized in that: The phase-isolated closed busbar comprises an A-phase busbar (5), a B-phase busbar (6) and a C-phase busbar (7); the inflation solenoid valve (4) comprises an A-phase inflation solenoid valve, a B-phase inflation solenoid valve and a C-phase inflation solenoid valve respectively; the A-phase busbar (5) is connected to the cold dryer (1) via the A-phase inflation solenoid valve, the B-phase busbar (6) is connected to the cold dryer (1) via the B-phase inflation solenoid valve, and the C-phase busbar (7) is connected to the cold dryer (1) via the C-phase inflation solenoid valve; and the industrial control all-in-one machine (2) is respectively communicatively connected to the A-phase inflation solenoid valve, the B-phase inflation solenoid valve and the C-phase inflation solenoid valve.

3. The isolated phase enclosed busbar micro-positive pressure device according to claim 1 is characterized in that: A temperature and humidity sensor (8) is also provided in each phase bus, and the industrial control integrated machine (2) is connected to all the temperature and humidity sensors (8) in communication; the industrial control integrated machine (2) is also used to receive temperature and humidity data in the corresponding phase bus fed back from the temperature and humidity sensor (8), and when the temperature data therein is lower than a preset temperature lower limit, or the humidity data therein is higher than a preset humidity upper limit, control the inflation solenoid valve (4) of the corresponding phase bus to open, and at the same time control the cold dryer (1) to open, so as to fill dry air into the corresponding phase bus.

4. The isolated phase enclosed busbar micro-positive pressure device according to claim 3 is characterized in that: The cold dryer (1) is also connected to the gas tank (10) via the first solenoid valve (9), and the industrial control all-in-one computer (2) is communicatively connected to the first solenoid valve (9); the industrial control all-in-one computer (2) is also used to control the opening of the first solenoid valve (9) while controlling the opening of the cold dryer (1).

5. The isolated phase enclosed busbar micro-positive pressure device according to claim 4 is characterized in that: A manual pressure regulating valve (11) is also provided on the connection line between the first solenoid valve (9) and the cold dryer (1).

6. The isolated phase enclosed busbar micro-positive pressure device according to claim 4 is characterized in that: The gas tank (10) is also connected with a manual air release valve (12).

7. The isolated phase enclosed busbar micro-positive pressure device according to claim 4 is characterized in that: The gas tank (10) is connected to a compressor (14) via a second solenoid valve (13), and the industrial control integrated machine (2) is communicatively connected to the second solenoid valve (13) and the compressor (14) respectively.

8. The isolated phase enclosed busbar micro-positive pressure device according to claim 7 is characterized in that: The gas tank (10) is provided with an in-tank pressure sensor (15), and the industrial control integrated computer (2) is communicatively connected with the in-tank pressure sensor (15); the industrial control integrated computer (2) is also used to receive the internal pressure data of the gas tank fed back from the in-tank pressure sensor (15), and when the internal pressure data of the gas tank is lower than a preset lower limit of the in-tank pressure value, control the second solenoid valve (13) to open, and control the compressor (14) to open, so as to fill the gas tank with compressed air; the industrial control integrated computer (2) is also used to close the second solenoid valve (13) and the compressor (14) when the internal pressure data of the gas tank reaches a preset upper limit of the in-tank pressure value.

9. The isolated phase enclosed busbar micro-positive pressure device according to claim 7 is characterized in that: The industrial control integrated machine (2) is respectively connected to the cold dryer (1), the compressor (14), the first solenoid valve (9), the second solenoid valve (13) and the respective relays of all the inflation solenoid valves (4). The industrial control integrated machine (2) controls whether the corresponding switch contacts are closed by controlling whether the relays are energized, thereby controlling whether the corresponding equipment or solenoid valves are opened.

10. A control method for a phase-isolated closed busbar micro-positive pressure device, characterized in that: The hardware basis of the method is the phase-isolated closed busbar micro-positive pressure device as claimed in claim 8; the method includes a gas tank inflation automatic control process and a phase-isolated closed busbar inflation automatic phase-separation control process running simultaneously; During the automatic control process of filling the gas tank, the industrial control integrated machine (2) collects the internal pressure data of the gas tank in real time; when the internal pressure data of the gas tank is lower than the preset lower limit of the tank pressure value, the second solenoid valve (13) and the compressor (14) are opened to fill the gas tank with compressed air; when the internal pressure data of the gas tank reaches the preset upper limit of the tank pressure value, the second solenoid valve (13) and the compressor (14) are closed; During the automatic phase-separation control process of the isolated closed busbar inflation, the industrial control integrated machine (2) collects the gas pressure data and temperature and humidity data of each phase busbar of the isolated closed busbar in real time; when the gas pressure data of any phase busbar is lower than the preset pressure lower limit, or the temperature data in the temperature and humidity data is lower than the preset temperature lower limit, or the humidity data in the temperature and humidity data is higher than the preset humidity upper limit, the inflation solenoid valve (4) of the corresponding phase busbar is opened, and the cold dryer (1) is opened at the same time; when the gas pressure data and temperature and humidity data of each phase busbar collected in real time are both within the preset value range, the cold dryer (1) and all the inflation solenoid valves (4) are closed.

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