Air compressor starting cabinet and air compressor starting method

Abstract

The application provides an air compressor starting cabinet and an air compressor starting method. The air compressor starting cabinet comprises a first control switch, a second control switch connected with an air compressor, and a third control switch connected with a transformer. The first control switch is connected with the second control switch and the third control switch respectively. After the third control switch controls the transformer to be turned on, the second control switch is adjusted to be in a closed state to control the air compressor to be turned on. The problem that the maintenance performance of the transformer is low when the transformer is used to start the air compressor in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compressor starting, in particular to an air compressor starting cabinet and an air compressor starting method. BACKGROUND

[0002] At present, the starting modes of medium-pressure air compressors are generally divided into direct starting, self-coupled transformer step-down starting, electric reactor step-down starting and soft starting.

[0003] However, when the motor is directly started, the no-load starting current can reach 4 to 7 times the rated current, and when the motor is loaded, the starting current can reach 8 to 10 times, and the multiplied starting current will have a great impact on the power supply system; when the electric reactor is step-down started, the motor terminal voltage also drops during the starting process, which can easily lead to insufficient torque during starting and is not easy to use for air compressor starting.

[0004] Although the self-coupled transformer has a small starting current during step-down starting and has a small impact on the power supply system, when the motor is started by the self-coupled transformer, the short-circuit current in the power system increases, and the current in the self-coupled transformer is large, which can easily damage the self-coupled transformer, and the maintenance cost of the self-coupled transformer is high in the later period. SUMMARY

[0005] The main purpose of the present application is to provide an air compressor starting cabinet and an air compressor starting method to solve the problem of high maintenance cost of the self-coupled transformer when the air compressor is started by the self-coupled transformer in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an air compressor starting cabinet is provided, which comprises: a first control switch; a second control switch connected with the air compressor; a third control switch connected with the transformer; the first control switch is connected with the second control switch and the third control switch respectively, and after the third control switch controls the transformer to be turned on, the air compressor is controlled to be turned on by adjusting the second control switch to be in the closed state.

[0007] Further, the air compressor starting cabinet further comprises a relay module, and the first control switch, the second control switch and the third control switch are connected with the relay module; the relay module comprises: a first intermediate relay connected with the third control switch; a second intermediate relay connected with the first time relay, the first intermediate relay, the second time relay and the second control switch respectively; a third intermediate relay connected with the second control switch.

[0008] Further, the relay module further comprises: a first time relay connected with the second intermediate relay and the third control switch respectively; a second time relay connected with the second intermediate relay; a third time relay connected with the first control switch and the second time relay respectively.

[0009] Further, the third control switch comprises a first opening auxiliary contact, and the second control switch comprises a first closing loop, and the first opening auxiliary contact is arranged in series on the first closing loop.

[0010] Further, the third control switch further comprises a first closing auxiliary contact, and the second control switch further comprises a first opening loop, and the first closing auxiliary contact is arranged in parallel on the first opening loop.

[0011] Further, the second control switch comprises a second opening auxiliary contact, and the third control switch comprises a second closing loop, and the second opening auxiliary contact is arranged in series on the second closing loop.

[0012] Further, the second control switch further comprises a second closing auxiliary contact, and the third control switch further comprises a second opening loop, and the second closing auxiliary contact is arranged in parallel on the second opening loop.

[0013] According to another aspect of the present application, a method for starting an air compressor is provided, which is suitable for the air compressor starting cabinet, and the method comprises the following steps: S10, sequentially controlling the first control switch and the third control switch of the air compressor starting cabinet to close, so as to start the transformer; S20, when the transformer is started for a first predetermined time, controlling the third control switch to open; S30, when the third control switch is opened for a second predetermined time, controlling the second control switch to close, so as to start the air compressor.

[0014] Further, the air compressor starting cabinet is the air compressor starting cabinet, and the method for controlling the third control switch to open comprises the following steps: controlling the coil of the first intermediate relay to lose electricity, and controlling the coils of the second time relay and the second intermediate relay to be electrified.

[0015] Further, the air compressor starting cabinet is the air compressor starting cabinet, and the method further comprises the following steps: when the first control switch is opened for the second predetermined time, and the second control switch is detected to be in the open state, and the coil of the third time relay is detected to be in the electrified state for a third predetermined time, a fault alarm is sent.

[0016] The air compressor starting cabinet comprises a first control switch, a second control switch and a third control switch, the second control switch is used for being connected with the air compressor, the third control switch is used for being connected with the transformer, and the first control switch is connected with the second control switch and the third control switch respectively, so that the air compressor is controlled to be started by adjusting the second control switch to be in the closed state after the third control switch controls the transformer to be started. In this way, before the air compressor is started, the transformer is controlled to be operated for a period of time by the third control switch, so that the transformer has a certain voltage, then the second control switch is controlled to be closed, the air compressor is started by the second control switch, at this time, since the transformer has been operated for a period of time, the impact of the current on the transformer is reduced when the air compressor is started, the problem that the transformer is easily short-circuited or damaged due to the excessive instantaneous current in the transformer is avoided, and the protection of the transformer and the maintenance cost of the transformer in the later period are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, make an explanation of the application, and do not constitute an improper limitation of the application. In the drawings:

[0018] Figure 1 A structural schematic diagram of an embodiment of the air compressor starting cabinet according to the application is shown;

[0019] Figure 2 A signal connection schematic diagram of a relay module in the air compressor starting cabinet according to the application is shown;

[0020] Figure 3 A linkage principle schematic diagram of the second control switch and the third control switch in the air compressor starting cabinet according to the application is shown;

[0021] Figure 4 A connection relationship diagram between the relay module of the air compressor starting cabinet according to the application and the first control switch, the second control switch and the third control switch is shown.

[0022] In the above drawings, the following reference signs are used:

[0023] 100, transformer; 200, main cabinet room; 300, auxiliary cabinet room; 400, capacitor assembly;

[0024] 1, first control switch; 10, third opening contact; 2, second control switch; 21, first closing circuit; 22, first opening circuit; 23, second opening auxiliary contact; 24, second closing auxiliary contact; 220, main opening circuit; 221, first opening branch circuit; 222, second opening branch circuit;

[0025] 3, third control switch; 31, first opening auxiliary contact; 32, first closing auxiliary contact; 33, second closing circuit; 34, second opening circuit;

[0026] 41, first time relay; 42, second time relay; 43, third time relay;

[0027] 51, first intermediate relay; 510, fourth relay contact; 52, second intermediate relay; 520, first relay contact; 53, third intermediate relay; 531, second relay contact; 532, third relay contact. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In the present application, the first control switch 1 is a vacuum contactor VCS-52, the second control switch 2 is a vacuum contactor VC-42, and the third control switch 3 is a vacuum contactor VC-6, wherein VC6X is the first intermediate relay 51, T1X is the second intermediate relay 52, T2X is the third intermediate relay 53, T1 is the first time relay 41, T2 is the second time relay 42, T3 is the third time relay 43, HQ is the closing coil, and TQ is the opening coil.

[0030] Please refer to Figures 1 to 4 The present application provides an air compressor starting cabinet, comprising: a first control switch 1; a second control switch 2 connected with an air compressor; a third control switch 3 connected with a transformer 100, the first control switch 1 is connected with the second control switch 2 and the third control switch 3 respectively, and after the third control switch 3 controls the transformer 100 to start, the second control switch 2 is adjusted to be in a closing state to control the air compressor to start.

[0031] The air compressor starting cabinet provided by the application comprises a first control switch 1, a second control switch 2 and a third control switch 3, the second control switch 2 is used to be connected with the air compressor, the third control switch 3 is used to be connected with the transformer 100, and the first control switch 1 is connected with the second control switch 2 and the third control switch 3 respectively, so that the air compressor is started by adjusting the second control switch 2 to be in the closed state after the third control switch 3 controls the transformer 100 to be started. In this way, before starting the air compressor, the transformer 100 is first controlled to run for a first predetermined time by the third control switch 3, so that the transformer 100 has a certain voltage, then the second control switch 2 is controlled to be closed, the second control switch 2 controls the air compressor to start, at this time, since the transformer 100 has run for a period of time, the impact of the current on the transformer 100 is reduced when the air compressor starts, the problem that the transformer 100 is easily short-circuited or damaged due to the excessive instantaneous current is avoided, the protection of the transformer 100 is realized, and the maintenance cost of the transformer 100 in the later period is reduced.

[0032] Further, the air compressor starting cabinet further comprises a capacitor assembly 400, the capacitor assembly 400 is connected with the air compressor, the air compressor is started through the transformer 100, needs to obtain a large amount of reactive power from the power grid, the capacitor assembly 400 is used to reduce the reactive power absorbed by the air compressor from the power grid in the way of local compensation, so that the impact on the power grid system is greatly reduced, and the air compressor can be started in a more harsh power grid environment.

[0033] Specifically, as shown in Figure 2 the air compressor starting cabinet further comprises a relay module, the first control switch 1, the second control switch 2 and the third control switch 3 are connected with the relay module, the relay module comprises: a first intermediate relay 51 connected with the third control switch 3, a second intermediate relay 52 connected with the second control switch 2, and a third intermediate relay 53 connected with the second control switch 2, the relay module further comprises: a first time relay 41 connected with the first intermediate relay 51 and the second intermediate relay 52 respectively, a second time relay 42 connected with the first time relay 41 and the third intermediate relay 53 respectively, and a third time relay 43 connected with the first control switch 1.

[0034] In the application, the relay module is connected with the first control switch 1 through the control circuit of the first control switch 1, the relay module is connected with the second control switch 2 through the control circuit of the second control switch 2, and the relay module is connected with the third control switch 3 through the control circuit of the third control switch 3; wherein the third time relay 43 and the control circuit of the second control switch 2 are on the same pulse signal, so that in the subsequent operation process, after the second control switch 2 sends out the tripping state signal, the signal is transmitted to the third time relay 43, so that the coil of the third time relay 43 is in the power-on state, and when the third time relay 43 runs for the third predetermined time, the first control switch 1 is in the closing state and the second control switch 2 is still in the tripping state, it can be judged that the air compressor starts to fail, and an alarm is sent out.

[0035] Wherein, the first time relay 41 is connected with the first intermediate relay 51, which facilitates the control of the running time of the third control switch 3 after closing by the first time relay 41; in the running process, when the first control switch 1 is in the closing state, the coil of the first time relay 41 and the coil of the first intermediate relay 51 are powered on, and the third control switch 3 is closed, after the first time relay 41 runs for the first predetermined time, the second time relay 42 and the second intermediate relay 52 are powered on, the coil of the first intermediate relay 51 loses power, and the third control switch 3 is tripped; after the second time relay 42 runs for the second predetermined time, the third intermediate relay 53 is powered on, at this time, the second control switch 2 is controlled to be closed.

[0036] As shown in Figure 3 In the application, the third control switch 3 includes a first tripping auxiliary contact 31, the second control switch 2 includes a first closing circuit 21, and the first tripping auxiliary contact 31 is arranged on the first closing circuit 21. In this way, when the first closing circuit 21 of the second control switch 2 is running, the first tripping auxiliary contact 31 triggers a tripping state signal to the second control switch 2, so that the third control switch 3 is in the tripping state; so that the second control switch 2 is in the closing state.

[0037] In the application, the logic principle for controlling the second control switch 2 to be closed is that: first, the first tripping auxiliary contact 31 receives the tripping state signal for controlling the third control switch 3 to be tripped, and then triggers the tripping state signal of the third control switch 3 to the first closing circuit 21 of the second control switch 2, the first closing circuit 21 of the second control switch 2 is running, so that the second control switch 2 is in the closing state.

[0038] Further, the third control switch 3 further comprises a first closing auxiliary contact 32, and the second control switch 2 further comprises a first opening circuit 22, and the first closing auxiliary contact 32 is connected in parallel to the first opening circuit 22. In this way, when the third control switch 3 is in the closing state, the first closing auxiliary contact 32 sends an opening signal to the first opening circuit 22 in the second control switch 2, and the first opening circuit 22 operates, and the second control switch 2 is immediately opened.

[0039] In the present application, the logic principle for controlling the second control switch 2 to open is that: first, the first closing auxiliary contact 32 receives the closing state signal for controlling the third control switch 3 to close, and then triggers the closing state signal of the third control switch 3 to the first opening circuit 22 of the second control switch 2, the first opening circuit 22 of the second control switch 2 operates, and the second control switch 2 is in the open state.

[0040] In the present application, the logic principle for controlling the second control switch 2 to open is that: first, the first closing auxiliary contact 32 receives the closing state signal for controlling the third control switch 3 to close, and then triggers the closing state signal of the third control switch 3 to the first opening circuit 22 of the second control switch 2, the first opening circuit 22 of the second control switch 2 operates, and the second control switch 2 is in the open state. Figure 2 Figure 3 As shown in FIG. 1, the first opening circuit 22 comprises a main opening circuit 220, a first opening branch circuit 221 and a second opening branch circuit 222, wherein the main opening circuit 220 is connected with the first opening branch circuit 221 and the second opening branch circuit 222 respectively, the first opening branch circuit 221 and the second opening branch circuit 222 are connected in parallel, and the first control switch 1 comprises a third opening contact 10, which is arranged on the first opening branch circuit 221. The first closing auxiliary contact 32 is arranged in parallel with the third opening contact 10. In the non-operating state, the first control switch 1 is in the open state, and therefore the third opening contact 10 is in the closed state. In this way, when the coils of the second intermediate relay 52 and the third intermediate relay 53 lose power, the second control switch 2 is in the open state under the closed state of the third opening contact 10. When the third control switch 3 is in the closing state, the first closing auxiliary contact 32 is closed, and at this time, the opening coil in the second control switch 2 is controlled to be conductive through the second opening branch circuit 222, so that the second control switch 2 remains in the open state.

[0041] The non-operating state refers to the state when the air compressor is not started, and the operating state refers to the state when the first control switch 1, the second control switch 2 and the third control switch 3 start to operate after receiving the instruction to start the air compressor.

[0042] In the present application, as shown in FIG. 1, when the first control switch 1 is in the open state, the third opening contact 10 receives the open state signal of the first control switch 1, and after the third opening contact 10 is closed, the coils of the second intermediate relay 52 and the third intermediate relay 53 lose power, the first opening circuit 22 operates, and the second control switch 2 is in the open state. Figure 3

[0043] ​​Specifically, after the first control switch 1 receives the closing command, the first control switch 1 is closed, and in the open state of the second control switch 2, the third control switch 3 is controlled to be closed by the first intermediate relay 51, and after the third control switch 3 is closed for a first predetermined time, the first intermediate relay 51 loses power, and the third control switch 3 is controlled to be opened; after a second predetermined time, the coils of the second intermediate relay 52 and the third intermediate relay 53 are powered, and when the first relay contact 520 of the second intermediate relay 52 and the second relay contact 531 of the third intermediate relay 53 are both closed in the open state of the third control switch 3, the second control switch 2 is controlled to be closed.

[0044] Further, the second control switch 2 includes a second opening auxiliary contact 23, and the third control switch 3 includes a second closing loop 33, and the second opening auxiliary contact 23 is arranged on the second closing loop 33. At this time, the second opening auxiliary contact 23 on the second closing loop 33 sends an open state signal to the third control switch 3, so that when the second control switch 2 is in the open state, the second closing loop 33 operates, and the third control switch 3 is in the closed state.

[0045] Specifically, the second intermediate relay 52 includes two first relay contacts 520, and the two first relay contacts 520 are arranged on the first closing loop 21 and the first opening loop 22, respectively; the third intermediate relay 53 includes a second relay contact 531 and a third relay contact 532, the second relay contact 531 is connected in series on the first closing loop 21, and the third relay contact 532 is connected in parallel on the first opening loop 22. Preferably, the third relay contact 532 is arranged on the second opening branch 222.

[0046] By connecting a first relay contact 520 and a second relay contact 531 in series on the first closing loop 21 in turn, both the first relay contact 520 and the second relay contact 531 are conductive, so that the second control switch 2 is in the closed state, or both the other first relay contact 520 and the third relay contact 532 are closed, so that the second control switch 2 is in the open state. It can be known here that the states of the two first relay contacts 520 are opposite, one of which is closed and the other is open, and the states of the second relay contact 531 and the third relay contact 532 are opposite, when the second relay contact 531 is closed, the third relay contact 532 is open. Avoiding the second control switch 2 from being closed when the third control switch 3 has not been completely opened, which avoids the third control switch 3 and the second control switch 2 being in the closed state at the same time, causing the entire circuit to malfunction.

[0047] Specifically, when the second control switch 2 is in the open state, the second open auxiliary contact 23 receives the open state signal of the second control switch 2, and then sends the open state signal of the second control switch 2 to the third control switch 3, the second closing loop 33 operates, and the third control switch 3 is in the closed state.

[0048] Further, the second control switch 2 further comprises a second closing auxiliary contact 24, and the third control switch 3 further comprises a second opening loop 34, and the second closing auxiliary contact 24 is connected in parallel to the second opening loop 34. In this way, when the second control switch 2 is in the closed state, the second closing auxiliary contact 24 sends an opening signal to the second opening loop 34 of the third control switch 3, the second opening loop 34 operates, and the third control switch 3 immediately opens.

[0049] Specifically, when the second control switch 2 is in the closed state, the second closing auxiliary contact 24 receives the closed state signal of the second control switch 2, and then sends the closed state signal of the second control switch 2 to the third control switch 3, the second opening loop 34 operates, and the third control switch 3 is in the open state.

[0050] In this application, by arranging the first opening auxiliary contact 31 on the first closing loop 21 of the second control switch 2, the first closing auxiliary contact 32 on the first opening loop 22, the second opening auxiliary contact 23 on the second closing loop 33 of the third control switch 3, and the second closing auxiliary contact 24 on the second opening loop 34, the second control switch 2 and the third control switch 3 realize the interlocking function, so that only one of the second control switch 2 and the third control switch 3 can be closed and the other can be opened, and they cannot be in the closed state at the same time, so as to avoid the overall circuit from malfunctioning when they are in the closed state at the same time, and to ensure the safety and reliability of the air compressor starting cabinet.

[0051] Specifically, the second intermediate relay 52 comprises two first relay contacts 520, which are arranged on the first closing loop 21 and the first opening loop 22 respectively; the third intermediate relay 53 comprises a second relay contact 531 and a third relay contact 532, the second relay contact 531 is connected in series on the first closing loop 21, and the third relay contact 532 is connected in parallel on the first opening loop 22. By connecting a first relay contact 520 and a second relay contact 531 in series on the first closing loop 21, both the first relay contact 520 and the second relay contact 531 are conductive, so that the second control switch 2 is in the closed state, and the second control switch 2 is closed when the third control switch 3 is not completely opened, which avoids the third control switch 3 and the second control switch 2 being in the closed state at the same time, causing the entire circuit to malfunction.

[0052] When the second intermediate relay 52 and the third intermediate relay 53 are powered, the first relay contact 520 on the first tripping circuit 22 is in a closed state, and the third relay contact 532 is in a closed state. In this state, if the first control switch 1 is tripped, the third tripping contact 10 is closed, the first tripping circuit 22 is conducted, and the second control switch 2 is tripped. In any state, when the third control switch 3 is in a closing state, the first tripping circuit 22 of the second control switch 2 is conducted, and when the second control switch 2 is in a closing state, the second tripping circuit 34 of the third control switch 3 is conducted, that is, the two switches of the second control switch 2 and the third control switch 3 are in different tripping / closing states in the logic control.

[0053] In the present application, the first intermediate relay 51 includes two fourth relay contacts 510, which are respectively arranged on the second closing circuit 33 and the second tripping circuit 34. When the first control switch 1 is in a closing state, the first intermediate relay 51 is powered, the fourth relay contact 510 on the second closing circuit 33 is closed, the second closing circuit 33 is operated, and the third control switch 3 is closed. After the third control switch 3 is operated for a first predetermined time, the first intermediate relay 51 is powered off, the fourth relay contact 510 on the second tripping circuit 34 is closed, the second tripping circuit 34 is operated, and the third control switch 3 is tripped.

[0054] In the specific implementation, the air compressor starting cabinet further includes a main cabinet room 200, the first control switch 1 and the second control switch 2 are arranged in the main cabinet room 200, and an auxiliary cabinet room 300, the third control switch 3 and the transformer 100 are arranged in the auxiliary cabinet room 300.

[0055] The present application also provides an air compressor starting method suitable for the air compressor starting cabinet of the above-mentioned embodiments, which comprises the following steps: S10, sequentially controlling the first control switch 1 and the third control switch 3 of the air compressor starting cabinet to be closed to start the transformer 100; S20, when the transformer 100 is started for a first predetermined time, controlling the third control switch 3 to be tripped; S30, when the third control switch 3 is tripped for a second predetermined time, controlling the second control switch 2 to be closed to start the air compressor. The third control switch 3 is used to first control the transformer 100 to be started, and the transformer 100 has a voltage before the air compressor is started. When the second control switch 2 controls the air compressor to be started, the starting current does not have a great impact on the transformer 100, thereby protecting the transformer 100.

[0056] The air compressor starting cabinet is the air compressor starting cabinet of the above embodiment, and the method for controlling the tripping of the third control switch 3 comprises: controlling the coil of the first intermediate relay 51 to lose power, and controlling the coils of the second time relay 42 and the second intermediate relay 52 to be powered.

[0057] Specifically, when the first intermediate relay 51 loses power, the tripping circuit of the third control switch 3 is controlled to operate, at this time, the second time relay 42 and the second intermediate relay 52 are powered at the same time, the second time relay 42 starts timing, and after reaching the second predetermined time, the third intermediate relay 53 is powered, at this time, the first tripping auxiliary contact 31 receives the tripping signal of the third control switch 3, the second relay contact 531 of the third intermediate relay 53 is closed, the first relay contact 520 located on the first closing circuit 21 is closed, the first closing circuit 21 is turned on, the closing coil HQ in the second control switch 2 is powered, and the second control switch 2 is controlled to be in the closed state.

[0058] The air compressor starting cabinet is the air compressor starting cabinet of the above embodiment, and the starting method further comprises: after the first control switch 1 is closed for the second predetermined time, and after detecting that the second control switch 2 is in the open state and the coil of the third time relay 43 is in the powered state and operates for the third predetermined time, a fault alarm is issued. In use, when it is detected that the second control switch 2 is still in the open state after the third time relay 43 is powered and operates for the third predetermined time, it indicates that the air compressor has not started, at this time, a fault display alarm is issued, and the first control switch 1 is controlled to be open.

[0059] In specific operation, the first predetermined time is 8s to 15s, within this time range, sufficient starting time is given to the transformer 100 until it reaches a stable running state; the second predetermined time is 0.5s to 3s, within this time range, the tripping circuit of the third control switch 3 or the closing circuit of the first control switch 1 operates smoothly; and the third predetermined time is 10s to 20s, within this time range, the risk of false judgment of faults is reduced, and the result of detecting faults is more accurate. Preferably, the first predetermined time is 13s, the second predetermined time is 1s, and the third predetermined time is 15s. Figure 3 As shown in the control principle diagram, in the air compressor starting program, the first control switch 1 always remains in the closed state, and only when the first control switch 1 is in the open state, the second control switch 2 can be open.

[0060] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0061] The air compressor starting cabinet provided by the application comprises a first control switch 1, a second control switch 2 and a third control switch 3, the second control switch 2 is used to be connected with the air compressor, the third control switch 3 is used to be connected with the transformer 100, and the first control switch 1 is connected with the second control switch 2 and the third control switch 3 respectively, so that the air compressor is controlled to be started by adjusting the second control switch 2 to be in the closed state after the third control switch 3 controls the transformer 100 to be started. In this way, before starting the air compressor, the transformer 100 is first controlled to run for a period of time by the third control switch 3, so that the transformer 100 has a certain voltage, then the second control switch 2 is controlled to be closed, the second control switch 2 controls the air compressor to start, at this time, since the transformer 100 has run for a period of time, the impact of the current on the transformer 100 is reduced when the air compressor starts, the problem that the transformer 100 is easily short-circuited or damaged due to the too large instantaneous current is avoided, the protection of the transformer 100 is realized, and the maintenance cost of the transformer 100 in the later period is reduced. In addition, when the transformer 100 is started by step-down, the starting current is small, the impact on the power supply system is small, the local compensation is adopted to reduce the reactive power absorbed by the air compressor from the power grid, the impact on the power grid system is greatly reduced, so that the air compressor can be started in a relatively harsh power grid environment, so that the safe, stable and reliable operation of the entire power supply system can be ensured.

[0062] The above only describes the preferred embodiments of the application and is not used to limit the application. The application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. An air compressor starter cabinet, characterized in that, include: First control switch (1); The second control switch (2) is connected to the air compressor; The third control switch (3) is connected to the transformer (100). The first control switch (1) is connected to the second control switch (2) and the third control switch (3) respectively. After the third control switch (3) controls the transformer (100) to start, the air compressor is controlled to start by adjusting the second control switch (2) to be in the closed state. The air compressor starter cabinet also includes a relay module, and the second control switch (2) and the third control switch (3) are both connected to the relay module; the relay module includes: a second intermediate relay (52) connected to the second control switch (2); and a third intermediate relay (53) connected to the second control switch (2); The third control switch (3) includes a first tripping auxiliary contact (31), and the second control switch (2) includes a first closing circuit (21). The first tripping auxiliary contact (31) is connected in series in the first closing circuit (21). When the first closing circuit (21) of the second control switch (2) is running, the first tripping auxiliary contact (31) triggers a tripping status signal to the third control switch (3), so that the third control switch (3) is in the tripping state and the second control switch (2) is in the closing state. The third control switch (3) further includes a first closing auxiliary contact (32), and the second control switch (2) further includes a first opening circuit (22). The first closing auxiliary contact (32) is connected in parallel on the first opening circuit (22). When the third control switch (3) is in the closed state, when the first closing auxiliary contact (32) sends an opening signal to the first opening circuit (22) in the second control switch (2), the first opening circuit (22) operates, and the second control switch (2) opens. The second intermediate relay (52) includes two first relay contacts (520), which are respectively disposed on the first closing circuit (21) and the first opening circuit (22); the third intermediate relay (53) includes a second relay contact (531) and a third relay contact (532), which are connected in series on the first closing circuit (21) and the third relay contact (532) are connected in parallel on the first opening circuit (22); The states of the two first relay contacts (520) are opposite, and the states of the second relay contact (531) and the third relay contact (532) are opposite.

2. The air compressor starter cabinet according to claim 1, characterized in that, The first control switch (1) is connected to the relay module; the relay module includes: The first intermediate relay (51) is connected to the third control switch (3).

3. The air compressor starter cabinet according to claim 2, characterized in that, The relay module also includes: The first time relay (41) is connected to the first intermediate relay (51) and the second intermediate relay (52) respectively; The second time relay (42) is connected to the first time relay (41) and the third intermediate relay (53) respectively; The third time relay (43) is connected to the first control switch (1).

4. The air compressor starter cabinet according to claim 1, characterized in that, The second control switch (2) includes a second tripping auxiliary contact (23), and the third control switch (3) includes: The second closing circuit (33) is connected in series with the second opening auxiliary contact (23) on the second closing circuit (33).

5. The air compressor starter cabinet according to claim 1, characterized in that, The second control switch (2) further includes a second closing auxiliary contact (24), and the third control switch (3) further includes: The second tripping circuit (34) has the second closing auxiliary contact (24) connected in parallel on the second tripping circuit (34).

6. A method for starting an air compressor, applicable to the air compressor starter cabinet according to any one of claims 1 to 5, characterized in that, The air compressor startup method includes: S10: Sequentially control the first control switch (1) and the third control switch (3) of the air compressor starter cabinet to close, so as to start the transformer (100). S20: After the transformer (100) has been started for a first predetermined time, control the third control switch (3) to open: S30: When the third control switch (3) is open for a second predetermined time, the second control switch (2) is closed to start the air compressor.

7. The air compressor start-up method according to claim 6, characterized in that, The air compressor starter cabinet is the air compressor starter cabinet as described in claim 3, and the method for controlling the tripping of the third control switch (3) includes: The coil of the first intermediate relay (51) is de-energized, and the coils of the second time relay (42) and the second intermediate relay (52) are energized.

8. The air compressor start-up method according to claim 6, characterized in that, The air compressor starter cabinet is the air compressor starter cabinet according to claim 3, and the starter method further includes: When the first control switch (1) is closed for the second predetermined time, and the second control switch (2) is detected to be in the open state and the coil of the third time relay (43) is in the energized state for the third predetermined time, a fault alarm is issued.

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