Pre-fabricated cabin type switch cabinet explosion-proof pressure relief control method

Abstract

This application discloses an explosion-proof pressure relief control method for a prefabricated compartment-type switchgear, applied to a cabinet with multiple chambers; each chamber is equipped with an electromagnetic spring pressure relief device; the electromagnetic spring pressure relief device includes: an outer plate, an inner plate, a push rod, an electromagnet, and a spring; the method includes: obtaining THB, P, and I. 总 Real-time data, where THB is the temperature and humidity value inside the chamber, P is the pressure value inside the chamber, and I... 总 This is the load current value of the cabinet; when I 总 When the distance is greater than I1, THB is greater than THB1, or P is greater than P1, the distance value of the inner plate relative to the preset position is obtained, where I1 is the first-level starting current value, THB1 is the first-level starting temperature and humidity value, and P1 is the first-level starting pressure value. It is then determined whether the distance value is greater than the preset distance value; if not, the electromagnet is energized. By real-time monitoring of the temperature and humidity values, pressure values, and cabinet load current values ​​within the cavity, the electromagnetic spring pressure relief device can be controlled according to different situations, achieving more precise pressure relief control.

Description

Technical Field

[0001] This application relates to the field of pressure relief device technology, and in particular to an explosion-proof pressure relief control method for a prefabricated cabin-type switchgear. Background Technology

[0002] Currently, in most 10kV switchgear equipment in substations, when short-circuit faults, excessive temperatures, excessive currents, or reduced insulation of components occur, the electric arc releases a large amount of heat instantaneously, heating the air and causing it to expand. If the expanded gas cannot be discharged in time, it can lead to deformation, displacement, or even rupture of the high-voltage equipment. If the ventilation inside the switchgear is poor, the arc-heated air may damage the switchgear, causing protection trips and serious consequences such as busbar power outages. Therefore, switchgear is generally equipped with pressure relief devices.

[0003] Current pressure relief methods for switchgear typically involve installing an openable cover, which is opened to release pressure when there is internal overpressure. However, this method cannot provide real-time pressure relief based on the internal pressure of the switchgear, resulting in poor pressure relief effectiveness. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide an explosion-proof pressure relief control method for prefabricated cabin-type switchgear, which solves the problem of poor pressure relief effect of existing switchgear pressure relief methods.

[0005] To achieve the above technical objectives, this application provides an explosion-proof pressure relief control method for prefabricated compartment-type switchgear, which is applied to a cabinet with multiple chambers;

[0006] Each of the chambers is equipped with an electromagnetic spring pressure relief device;

[0007] The electromagnetic spring pressure relief device includes: an outer plate, an inner plate, a push rod, an electromagnet, and a spring;

[0008] The electromagnet is fixed inside the cavity;

[0009] The push rod is slidably connected to the electromagnet, and its front end and rear end are respectively connected to the outer plate and the inner plate;

[0010] One end of the spring is connected to the electromagnet, and the other end is connected to the inner plate;

[0011] The inner plate is used to move forward when pushed by pressure, pushing the push rod forward to open the outer plate for pressure relief;

[0012] The electromagnet is used to drive the push rod forward when energized, so that the outer plate opens to release pressure;

[0013] The method includes the following steps:

[0014] S1. Obtain THB, P, and I. 总 Real-time data, where THB is the temperature and humidity value inside the chamber, P is the pressure value inside the chamber, and I... 总 This refers to the load current value of the cabinet.

[0015] S2, when I 总 When I1 is greater than THB or THB1 or P is greater than P1, the distance value of the inner plate relative to the preset position is obtained, where I1 is the first-level starting current value, THB1 is the first-level starting temperature and humidity value, and P1 is the first-level starting pressure value.

[0016] S3. Determine whether the distance value is greater than the preset distance value. If not, proceed to step S4.

[0017] S4. Control the electromagnet to be energized.

[0018] Furthermore, after step S4, the method further includes:

[0019] S41. Obtain the current value of the electromagnet;

[0020] S42. Determine whether the current value of the electromagnet is greater than the preset magnet current value. If not, output a magnet fault signal. If yes, obtain the energization time of the electromagnet in real time and proceed to step S43.

[0021] S43, Regarding THB, P, and I 总 Monitoring is conducted when I 总 If I1, THB, and P are less than P1, and the energizing time exceeds a preset time, the electromagnet is de-energized and the process returns to step S1.

[0022] Furthermore, step S43 also includes:

[0023] When I 总 When I2 is greater than THB or THB2 or P is greater than P2, the current value of the electromagnet is increased and the process proceeds to step S44, where I2 is the secondary start-up current value, THB2 is the secondary start-up temperature and humidity value, and P2 is the secondary start-up pressure value.

[0024] S44. When I 总 If the current value of the electromagnet is less than I2, THB is less than THB2, and P is less than P2, and the energizing time of the electromagnet exceeds the preset time, the current value of the electromagnet is reduced and the process returns to step S41.

[0025] Furthermore, if the judgment result of step S3 is yes, then proceed to step S5;

[0026] S5, regarding THB, P, and I 总 Monitoring is conducted when I 总When I2 is greater than THB, THB is greater than THB2, or P is greater than P2, the electromagnet is energized.

[0027] Furthermore, after step S5, the method further includes:

[0028] S6. Obtain the current value of the electromagnet;

[0029] S7. Determine whether the current value of the electromagnet is greater than the preset magnet current value. If so, obtain the energization time of the electromagnet in real time and proceed to step S8.

[0030] S8, regarding THB, P and I 总 Monitoring is conducted when I 总 If I2, THB, and P are less than P2, and the energizing time exceeds a preset time, the pressure relief valve is closed and the process returns to step S5.

[0031] Furthermore, the electromagnetic spring pressure relief device also includes: a pressure relief valve that can be controlled to open and close;

[0032] Step S8 further includes:

[0033] When I 总 When I3 is greater than I3, THB is greater than THB3, or P is greater than P3, the pressure relief valve is opened, where I3 is the three-stage starting current value, THB3 is the three-stage starting temperature and humidity value, and P3 is the three-stage starting pressure value.

[0034] Furthermore, after opening the pressure relief valve in step S8, the method further includes:

[0035] S9, regarding THB, P, and I 总 Monitoring is conducted when I 总 If the values ​​of I3, THB, and P are less than P3, and the energization time exceeds the preset time, the electromagnet is de-energized and the process returns to step S5.

[0036] Furthermore, in step S1, after obtaining THB, P, and I... 总 In addition to real-time data, it also includes:

[0037] Determine THB, P, and I 总 If any of the values ​​exceeds the preset range, then the electromagnet in that chamber is controlled to be energized and de-energized synchronously with the electromagnet in the adjacent chamber.

[0038] Furthermore, each of the chambers is also equipped with an acoustic wave monitor;

[0039] The method also includes:

[0040] Acquire the sound waves inside the cabinet, and when the sound waves are detected to match the preset historical discharge sound waves, control the electromagnet to be energized.

[0041] Furthermore, each of the chambers is also equipped with an electric fan;

[0042] The electric fan and the electromagnet are powered on and off synchronously.

[0043] As can be seen from the above technical solutions, this application provides a prefabricated compartment-type switchgear explosion-proof pressure relief control method, applied to a cabinet with multiple chambers; each chamber is equipped with an electromagnetic spring pressure relief device; the electromagnetic spring pressure relief device includes: an outer plate, an inner plate, a push rod, an electromagnet, and a spring; the method includes the following steps: S1, obtaining THB, P, and I. 总 Real-time data, where THB is the temperature and humidity value inside the chamber, P is the pressure value inside the chamber, and I... 总 S2, when I is the load current value of the cabinet; 总 When the distance is greater than I1, THB is greater than THB1, or P is greater than P1, the distance value of the inner plate relative to the preset position is obtained, where I1 is the first-level starting current value, THB1 is the first-level starting temperature and humidity value, and P1 is the first-level starting pressure value; S3, determine whether the distance value is greater than the preset distance value. If not, proceed to step S4; S4, control the electromagnet to be energized. By real-time monitoring of the temperature and humidity value, pressure value and the load current value of the cabinet in the cavity, the electromagnetic spring pressure relief device can be controlled according to different situations to achieve more precise pressure relief control and solve the problem of poor pressure relief effect of existing switch cabinet pressure relief methods. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A schematic diagram of the electromagnetic spring pressure relief device 20 in a prefabricated cabin-type switchgear explosion-proof pressure relief control method provided in this application embodiment;

[0046] Figure 2 A schematic diagram of a push rod and electromagnet for a prefabricated cabin-type switchgear explosion-proof pressure relief control method provided in this application embodiment;

[0047] Figure 3 A flowchart illustrating an explosion-proof pressure relief control method for a prefabricated cabin-type switchgear, provided as an embodiment of this application;

[0048] Figure 4 A flowchart illustrating an explosion-proof pressure relief control method for a prefabricated cabin-type switchgear, provided for other embodiments of this application. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0050] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0052] This application discloses an explosion-proof pressure relief control method for a prefabricated compartment-type switchgear, applied to the cabinet. The cabinet contains multiple chambers, such as a circuit breaker chamber, a busbar chamber, and a lower cabinet chamber.

[0053] Please see Figure 1Each chamber is equipped with an electromagnetic spring pressure relief device 20, which includes an outer plate 21, an inner plate 22, a push rod 23, an electromagnet 24, and a spring 25. A pressure relief channel is provided within each chamber. A pressure relief door 10 is provided on the pressure relief channel. A pressure relief hole 11 is provided on the pressure relief door 10. The outer plate 21 is shaped to match the pressure relief hole 11 and is slidably disposed within the pressure relief hole 11 in the horizontal direction; thus, when the outer plate 21 is within the pressure relief hole 11, the two are sealed together; when the outer plate 21 is opened, that is, when the outer plate 21 slides out of the pressure relief hole 11, the pressure relief channel is connected to the outside, allowing pressure relief. The inner plate 22 is located within the chamber. The electromagnet 24 is fixed within the chamber. The push rod 23 is slidably connected to the electromagnet 24, and its front and rear ends are respectively connected to the outer plate 21 and the inner plate 22; one end of the spring 25 is connected to the electromagnet 24, and the other end is connected to the inner plate 22.

[0054] It should be noted that the electromagnetic spring pressure relief device 20 undergoes a pressure test before installation. When the pressure inside the cavity is too high and exceeds the preset pressure, the inner plate 22 is pushed forward by the pressure, thereby pushing the push rod 23 forward to open the outer plate 21, that is, to slide out of the pressure relief hole 11 for pressure relief. The front end of the push rod 23 is provided with a magnetic pole opposite to that of the electromagnet 24 when it is energized; when the electromagnet 24 is energized, the magnetic force can drive the push rod 23 forward, causing the outer plate 21 to open for pressure relief.

[0055] This method is applied to the detection of individual chambers; please refer to [link / reference]. Figure 3 This includes the following steps:

[0056] S1. Obtain THB, P, and I. 总 Real-time data, where THB is the temperature and humidity value inside the chamber, P is the pressure value inside the chamber, and I... 总 This is the load current value of the cabinet.

[0057] Among them, I 总 This refers to the bus current value inside the cabinet. Temperature and humidity sensors, pressure sensors, and load current measuring devices can be installed in each chamber of the cabinet.

[0058] S2, regarding THB, P, and I 总 The magnitude of the current is monitored and judged. Let I1 be the first-stage starting current value, THB1 be the first-stage starting temperature and humidity value, and P1 be the first-stage starting pressure value. When I... 总 When >I1 or THB>THB1 or P>P1, obtain the distance value of the inner plate 22 relative to the preset position.

[0059] The preset position of the inner panel 22 can be the position where the outer panel 21 is closed, that is, when the outer panel 21 is sealed to the pressure relief hole 11 and the outer end face of the outer panel 21 is flush with the outer end face of the pressure relief door 10. When the load current value of the cabinet or the temperature and humidity inside the cavity increase, the pressure inside the cavity will increase accordingly. Therefore, I1, THB1, and P... 1的 The value can be set based on the stress test before installation. In I 总 When >I1 or THB>THB1 or P>P1, the inner plate 22 will be pushed forward by the pressure inside the cavity, causing the outer plate 21 to move forward accordingly and open the pressure relief hole 11 to relieve pressure.

[0060] S3. Determine if the distance value is greater than the preset distance value. If not, proceed to step S4.

[0061] By monitoring the distance value, it can be determined whether the forward movement distance of the inner panel 22 meets the preset distance value. If not, it indicates that the opening degree of the outer panel 21 is insufficient under the current conditions, and therefore proceeds to step S4.

[0062] S4 controls the energization of electromagnet 24.

[0063] When the inner panel 22 cannot be passively opened due to wear, rust, or other external factors caused by prolonged use, the electromagnet 24 can be energized to drive the push rod 23 to slide forward, thereby actively controlling the opening of the outer panel 21 and actively relieving pressure.

[0064] In other embodiments, please refer to Figure 2 After step S4, the following may also be included:

[0065] S41. Obtain the current value of electromagnet 24;

[0066] S42. Determine whether the current value of electromagnet 24 is greater than the preset magnet current value. If not, output a magnet fault signal. If yes, obtain the energization time of electromagnet 24 in real time and proceed to step S43.

[0067] Specifically, the magnetic force generated by electromagnet 24 is positively correlated with its current value. By monitoring the magnetic force generated by electromagnet 24, the magnitude of the magnetic force can be determined. When its current value is less than the preset magnet current value, it indicates that the outer panel 21 is not open sufficiently. A magnet fault signal is output to remind staff to intervene and prevent the cabinet from failing to release pressure in a timely manner.

[0068] S43, Regarding THB, P, and I 总 Monitoring will be conducted. When I 总 If <I1, THB < THB1 and P < P1, and the energizing time exceeds the preset time, control the electromagnet 24 to de-energize and return to step S1.

[0069] Specifically, when the current value of electromagnet 24 is turned on and meets the requirements, the pressure inside the cavity will gradually decrease as the pressure is released. When all conditions inside the cavity meet the requirements, electromagnet 24 can be de-energized, and the tension of spring 25 on inner plate 22 will gradually move backward, thereby reducing the opening degree of outer plate 21. Monitoring the energizing time of electromagnet 24 ensures that the energizing time of electromagnet 24 meets the preset requirements each time, avoiding damage caused by frequent on / off switching of electromagnet 24.

[0070] In other embodiments, step S43 may further include:

[0071] When I 总 When I2 > THB > THB2 or P > P2, increase the current value of electromagnet 24 and proceed to step S44. Here, I2 is the secondary starting current value, THB2 is the secondary starting temperature and humidity value, and P2 is the secondary starting pressure value.

[0072] That is, in step S43, THB, P and I are detected. 总 If the value is gradually reduced to below the level required for initial activation, electromagnet 24 will be de-energized, and THB, P, and I will be monitored. 总 Increasing the current to a value greater than that of a second-stage starter vertically increases the current to the electromagnet.

[0073] S44. When I 总 If <I2, THB < THB2 and P < P2, and the energizing time of electromagnet 24 exceeds the preset time, reduce the current of electromagnet 24 and return to step S41.

[0074] By monitoring the current value of electromagnet 24, it is possible to determine the relationship between THB, P, and I. 总 The numerical adjustment of the current value of electromagnet 24 enables more precise pressure relief control.

[0075] As a further improvement, in other embodiments, if the determination result of step S3 is yes, then proceed to step S5;

[0076] S5, regarding THB, P, and I 总 Monitoring is conducted when I 总 When I2 > THB > THB2 or P > P2, control electromagnet 24 is energized.

[0077] Specifically, after determining through S3 that the inner plate 22 can move with the THB, P and I in the cavity... 总 After the corresponding automatic movement, the controller maintains the connection between THB, P, and I. 总 Monitoring will be conducted. When I 总When I1, THB < THB1, and P < P1, the inner plate 22 will move backward due to the reduced pressure from the spring 25, causing the outer plate 21 to decrease in opening degree to close. Correspondingly, when THB, P, and I... 总 If the value is increased to meet the requirements for secondary startup, electromagnet 24 will be energized to perform further active pressure relief.

[0078] In other embodiments, step S5 is followed by:

[0079] S6. Obtain the current value of electromagnet 24;

[0080] S7. Determine whether the current value of electromagnet 24 is greater than the preset magnet current value. If so, obtain the energization time of the electromagnet in real time and proceed to step S8.

[0081] S8, regarding THB, P and I 总 Monitoring is conducted when I 总 If <I2, THB < THB2 and P < P2, and the energizing time exceeds the preset time, control the electromagnet 24 to de-energize and return to step S5.

[0082] In other embodiments, the pressure relief door 10 can be controlled to open and close. For example, the pressure relief door 10 can be raised and lowered onto the cabinet.

[0083] Step S8 also includes:

[0084] When I 总 When I3 > THB > THB3 or P > P3, the pressure relief valve 10 is opened, where I3 is the third-level starting current value, THB3 is the third-level starting temperature and humidity value, and P3 is the third-level starting pressure value.

[0085] Furthermore, after step S8 opens the pressure relief valve 10, the following steps are also included:

[0086] S9, regarding THB, P, and I 总 Monitoring is conducted when I 总 If <I3, THB < THB3 and P < P3, and the energizing time exceeds the preset time, control the pressure relief valve 10 to close and return to step S5.

[0087] Specifically, when I 总 When I3 > THB or THB3 or P > P3, that is, when THB, P and I in the cavity are equal, the concentration of THB, P and I in the cavity is equal. 总 When the value meets the value for Level 3 start-up, the controller controls the pressure relief valve 10 to open, which means that the pressure relief channel on the cavity is fully opened for rapid pressure relief.

[0088] In other embodiments, in step S1, after obtaining THB, P and I... 总 In addition to real-time data, it also includes:

[0089] Determine THB, P, and I 总 If any of the values ​​exceeds the preset range, then the electromagnet in that chamber is controlled to be energized and de-energized synchronously with the electromagnet in the adjacent chamber.

[0090] Specifically, in THB, P and I 总 If any of the parameters exceeds the preset range, it indicates that the temperature and humidity sensor, pressure sensor, or load current measuring device within the chamber may be damaged, resulting in inaccurate measurement data. Therefore, the electromagnet in this chamber will be energized synchronously with the electromagnets in adjacent chambers, and a fault signal will be sent to the operator.

[0091] Furthermore, each chamber is also equipped with a sound wave monitor;

[0092] The method also includes:

[0093] Acquire the sound waves inside the cabinet, and when the sound waves are detected to match the preset historical discharge sound waves, control the electromagnet 24 to be energized.

[0094] Specifically, the sound waves inside the cabinet can be, for example, the sound waves of an electric arc discharge. The preset historical discharge sound waves can be the sound waves inside the cabinet under overpressure conditions. By monitoring the sound waves, the accuracy of pressure relief control can be further improved.

[0095] Furthermore, each chamber is also equipped with an electric fan 30; the electric fan 30 can be installed on the inner plate 22 and is switched on and off synchronously with the electromagnet 24, that is, it can rotate when the electromagnet 24 is energized to increase the speed of gas flow.

[0096] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although this application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for explosion-proof pressure relief control of a prefabricated cabin-type switchgear, characterized in that, Applied to cabinets with multiple chambers; Each of the chambers is equipped with an electromagnetic spring pressure relief device; The electromagnetic spring pressure relief device includes: an outer plate, an inner plate, a push rod, an electromagnet, and a spring; The electromagnet is fixed inside the cavity; The push rod is slidably connected to the electromagnet, and its front end and rear end are respectively connected to the outer plate and the inner plate; One end of the spring is connected to the electromagnet, and the other end is connected to the inner plate; The inner plate is used to move forward when pushed by pressure, pushing the push rod forward to open the outer plate for pressure relief; The electromagnet is used to drive the push rod forward when energized, so that the outer plate opens to release pressure; The method includes the following steps: S1. Obtain THB, P, and I. 总 Real-time data, where THB is the temperature and humidity value inside the chamber, P is the pressure value inside the chamber, and I... 总 This refers to the load current value of the cabinet. S2, when I 总 When I1 is greater than THB or THB1 or P is greater than P1, the distance value of the inner plate relative to the preset position is obtained, where I1 is the first-level starting current value, THB1 is the first-level starting temperature and humidity value, and P1 is the first-level starting pressure value. S3. Determine whether the distance value is greater than the preset distance value. If not, proceed to step S4. S4. Control the electromagnet to be energized so that the push rod slides forward to actively control the opening of the outer plate and actively release pressure.

2. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to claim 1, characterized in that, The process following step S4 also includes: S41. Obtain the current value of the electromagnet; S42. Determine whether the current value of the electromagnet is greater than the preset magnet current value. If not, output a magnet fault signal. If yes, obtain the energization time of the electromagnet in real time and proceed to step S43. S43, Regarding THB, P, and I 总 Monitoring is conducted when I 总 If I1, THB, and P are less than P1, and the energizing time exceeds the preset time, the electromagnet is de-energized and the process returns to step S1.

3. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to claim 2, characterized in that, Step S43 further includes: When I 总 When I2 is greater than THB or THB2 or P is greater than P2, the current value of the electromagnet is increased and the process proceeds to step S44, where I2 is the secondary start-up current value, THB2 is the secondary start-up temperature and humidity value, and P2 is the secondary start-up pressure value. S44. When I 总 If the current value of the electromagnet is less than I2, THB is less than THB2, and P is less than P2, and the energizing time of the electromagnet exceeds the preset time, the current value of the electromagnet is reduced and the process returns to step S41.

4. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to claim 1, characterized in that, If the judgment result of step S3 is yes, then proceed to step S5; S5, regarding THB, P, and I 总 Monitoring is conducted when I 总 When I2 is greater than THB, THB is greater than THB2, or P is greater than P2, the electromagnet is energized.

5. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to claim 4, characterized in that, Following step S5, the following is also included: S6. Obtain the current value of the electromagnet; S7. Determine whether the current value of the electromagnet is greater than the preset magnet current value. If so, obtain the energization time of the electromagnet in real time and proceed to step S8. S8, regarding THB, P and I 总 Monitoring is conducted when I 总 If I2, THB, and P are less than P2, and the energizing time exceeds a preset time, the electromagnet is de-energized and the process returns to step S5.

6. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to claim 5, characterized in that, The electromagnetic spring pressure relief device also includes: a pressure relief valve that can be controlled to open and close; Step S8 further includes: When I 总 When I3 is greater than I3, THB is greater than THB3, or P is greater than P3, the pressure relief valve is opened, where I3 is the three-stage starting current value, THB3 is the three-stage starting temperature and humidity value, and P3 is the three-stage starting pressure value.

7. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to claim 6, characterized in that, After step S8 opens the pressure relief valve, the following steps are also included: S9, regarding THB, P, and I 总 Monitoring is conducted when I 总 If I3 is less than 1, THB is less than THB3 and P is less than P3, and the energizing time exceeds the preset time, the pressure relief valve is controlled to close and the process returns to step S5.

8. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to claim 1, characterized in that, In step S1, THB, P and I are obtained. 总 In addition to real-time data, it also includes: Determine THB, P, and I 总 If any of the parameters exceeds the preset range, then the electromagnet in that chamber is controlled to be energized and de-energized synchronously with the electromagnet in the adjacent chamber.

9. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to claim 1, characterized in that, Each of the chambers is also equipped with an acoustic wave monitor; The method also includes: Acquire the sound waves inside the cabinet, and when the sound waves are detected to match the preset historical discharge sound waves, control the electromagnet to be energized.

10. The explosion-proof pressure relief control method for prefabricated cabin-type switchgear according to any one of claims 1-9, characterized in that, Each of the chambers is also equipped with an electric fan; The electric fan and the electromagnet are powered on and off synchronously.

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