Cooling system automatic starting device for excitation system rectifier cabinet

Abstract

The utility model relates to the field of power supply starting equipment of cooling equipment, in particular to a cooling system automatic starting device for an excitation system rectifier cabinet, which comprises a first power supply air switch and a first coil which are electrically connected to an A-phase power line, a B-phase power line and a C-phase power line of a main cooling fan. The second power supply air switch and the second coil are electrically connected to an A-phase power line, a B-phase power line and a C-phase power line which are composed of a plurality of auxiliary cooling fans; the cooling system starting control loop is arranged between the main cooling fan and the auxiliary cooling fans, two auxiliary contacts of the field suppression switch are electrically connected in the cooling system starting control loop, and one auxiliary contact of the field suppression switch is connected in the starting control loop of the main cooling fan in parallel. And the other auxiliary contact of the field suppression switch is connected in parallel in a starting control loop of the auxiliary cooling fan. According to the utility model, normal operation of the rectifier cabinet cooling system can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of power supply starting equipment for cooling equipment, and specifically to an automatic starting device for the cooling system of the excitation system rectifier cabinet. Background Technology

[0002] The cooling system of the excitation system rectifier cabinet generally consists of a main cooling fan and multiple auxiliary cooling fans. Under normal circumstances, the main cooling fan operates, and in the event of a failure of the main cooling fan or a power outage, it automatically switches to the auxiliary cooling fans.

[0003] Currently, the start-stop control of the main cooling fan and auxiliary cooling fan can only be operated locally. It is not possible to automatically start the cooling system after the excitation system is put into operation remotely. Local operation is prone to the risk of missing the cooling system, causing the rectifier cabinet to overheat and the excitation system to shut down. Utility Model Content

[0004] The present invention aims to provide an automatic start-up device for the cooling system of the rectifier cabinet of the excitation system, so as to solve the problem of the risk of the excitation system shutting down due to overheating of the rectifier cabinet caused by the failure to start the cooling system.

[0005] The automatic start device for the cooling system of the excitation system rectifier cabinet in this scheme includes a first power circuit breaker and a first coil electrically connected to the A-phase, B-phase and C-phase power lines of the main cooling fan, and a second power circuit breaker and a second coil electrically connected to the A-phase, B-phase and C-phase power lines of multiple auxiliary cooling fans.

[0006] It also includes a cooling system start-up control circuit set between a main cooling fan and multiple auxiliary cooling fans. The cooling system start-up control circuit is electrically connected to two auxiliary contacts of a demagnetizing switch. One auxiliary contact of the demagnetizing switch is connected in parallel in the start-up control circuit of the main cooling fan, and the other auxiliary contact of the demagnetizing switch is connected in parallel in the start-up control circuit of the auxiliary cooling fans.

[0007] Furthermore, the cooling system startup includes a switch electrically connected between the main cooling fan and the auxiliary cooling fan. The switch is electrically connected to a first branch line and a second branch line that respectively control the power supply to the main cooling fan and the auxiliary cooling fan. Both the first branch line and the second branch line are grounded.

[0008] Furthermore, the first and third pins of the changeover switch are electrically connected between the first power circuit breaker and the first coil of the A-phase power line of the main cooling fan, and the second and fourth pins of the changeover switch are electrically connected to the first branch line;

[0009] The fifth and seventh pins of the changeover switch are electrically connected between the second power circuit breaker and the second coil of the A-phase power line of the auxiliary cooling fan, and the sixth and eighth pins of the changeover switch are electrically connected to the second branch line.

[0010] Furthermore, the connection circuit of the first branch line is as follows: the second pin is electrically connected to one end of the normally closed auxiliary contact of the second coil, the other end of the normally closed auxiliary contact of the second coil is electrically connected to one end of the normally closed contact of the first coil, the other end of the normally closed auxiliary contact of the second coil is electrically connected to the fourth pin, the other end of the normally closed auxiliary contact of the second coil is electrically connected to one end of a resistor, the other end of the resistor is electrically connected to one end of a capacitor, and the other end of the capacitor and the other end of the normally closed contact of the first coil are grounded.

[0011] Furthermore, the connection circuit of the second branch line is as follows: the eighth pin is electrically connected to one end of the normally closed auxiliary contact of the first coil, the other end of the normally closed auxiliary contact of the first coil is electrically connected to one end of the normally closed contact of the second coil, the other end of the normally closed auxiliary contact of the first coil is electrically connected to the sixth pin, the other end of the normally closed auxiliary contact of the first coil is electrically connected to one end of another resistor, the other end of the other resistor is electrically connected to one end of another capacitor, and the other end of the other capacitor and the other end of the normally closed contact of the second coil are grounded.

[0012] Furthermore, one auxiliary contact of the demagnetizing switch is electrically connected between the fourth pin and the first pin, and the other auxiliary contact of the demagnetizing switch is electrically connected between the eighth pin and the seventh pin.

[0013] The beneficial effects of this plan are:

[0014] After the excitation system is put into operation, the demagnetization switch is closed, and the main cooling fan is automatically started. If the main cooling fan loses power, the auxiliary cooling fan can be started automatically to ensure the normal operation of the rectifier cabinet cooling system and prevent the risk of the excitation system shutting down due to overheating of the rectifier cabinet caused by the failure to start the cooling system. Attached Figure Description

[0015] Figure 1 This is a circuit connection diagram of an embodiment of the automatic start-up device for the cooling system of the excitation system rectifier cabinet of this utility model. Detailed Implementation

[0016] The following detailed description provides further details on specific implementation methods.

[0017] Example

[0018] Automatic start-up device for the cooling system of the excitation system rectifier cabinet, such as Figure 1The diagram shows a system including a first power circuit breaker QF1 and a first coil KM1 electrically connected to the A-phase, B-phase, and C-phase power lines of the main cooling fan; and a second power circuit breaker QF2 and a second coil KM2 electrically connected to the A-phase, B-phase, and C-phase power lines of multiple auxiliary cooling fans. The first coil KM1 is located closer to the main cooling fan, and the second coil KM2 is located closer to the auxiliary cooling fans. The A-phase, B-phase, and C-phase power lines of the main cooling fan correspond to the power lines marked U1, V1, and W1 on the diagram, respectively. Three auxiliary cooling fans are provided. All three cooling fans start simultaneously. Because the main cooling fan has a high power output, the auxiliary cooling fans serve as backup. Under normal circumstances, the main cooling fan starts; if the main cooling fan fails, the system automatically switches to the auxiliary cooling fans. The auxiliary cooling fans have lower power output, requiring the airflow of three smaller cooling fans to equal that of the main cooling fan.

[0019] It also includes a cooling system start-up control circuit set between a main cooling fan and multiple auxiliary cooling fans. The cooling system start-up control circuit is electrically connected to two auxiliary contacts of the demagnetizing switch FMK. One auxiliary contact of the demagnetizing switch FMK is connected in parallel in the start-up control circuit of the main cooling fan, and the other auxiliary contact of the demagnetizing switch FMK is connected in parallel in the start-up control circuit of the auxiliary cooling fans.

[0020] The cooling system startup includes a changeover switch SA electrically connected between the main cooling fan and the auxiliary cooling fan. The contact diagram of the changeover switch SA is shown in Table 1. In the table, circles indicate open contacts and crosses indicate closed contacts. The changeover switch is electrically connected to a first branch line and a second branch line that respectively control the power supply to the main cooling fan and the auxiliary cooling fan. Both the first branch line and the second branch line are grounded.

[0021] Table 1SA Switch Contact Table

[0022] I S II 1-2 ○ ○ × 3-4 × ○ ○ 5-6 ○ ○ × 7-8 × ○ ○

[0023] The first and third pins of the changeover switch SA are electrically connected between the first power circuit breaker QF1 and the first coil KM1 on the A-phase power line of the main cooling fan. The second and fourth pins of the changeover switch SA are electrically connected to the first branch line. The connection circuit of the first branch line is as follows: the second pin is electrically connected to one end of the normally closed auxiliary contact of the second coil KM2; the other end of the normally closed auxiliary contact of the second coil KM2 is electrically connected to one end of the normally closed contact of the first coil KM1; the other end of the normally closed auxiliary contact of the second coil KM2 is electrically connected to the fourth pin; the other end of the normally closed auxiliary contact of the second coil KM2 is electrically connected to one end of a resistor; the other end of the resistor is electrically connected to one end of a capacitor; and the other end of the capacitor and the other end of the normally closed contact of the first coil KM1 are grounded.

[0024] The fifth and seventh pins of the changeover switch are electrically connected between the second power circuit breaker QF2 and the second coil KM2 on the A-phase power line of the auxiliary cooling fan. The sixth and eighth pins of the changeover switch SA are electrically connected to the second branch line. The connection circuit of the second branch line is as follows: the eighth pin is electrically connected to one end of the normally closed auxiliary contact of the first coil KM1; the other end of the normally closed auxiliary contact of the first coil KM1 is electrically connected to one end of the normally closed contact of the second coil KM2; the other end of the normally closed auxiliary contact of the first coil KM1 is electrically connected to the sixth pin; the other end of the normally closed auxiliary contact of the first coil KM1 is electrically connected to one end of another resistor; the other end of the other resistor is electrically connected to one end of another capacitor; and the other end of the other capacitor and the other end of the normally closed contact of the second coil KM2 are grounded.

[0025] One auxiliary contact of the demagnetizing switch FMK is electrically connected between pin 4 and pin 1, and the other auxiliary contact of the demagnetizing switch FMK is electrically connected between pin 8 and pin 7. The two auxiliary contacts of the demagnetizing switch FMK are connected to pin 4 and pin 8 respectively, which ensures that the main cooling fan starts first, and only switches to the auxiliary cooling fan if the main cooling fan fails or power is lost.

[0026] The specific implementation process is as follows:

[0027] During control, switch the selector switch SA to position S, close the power circuit breakers QF1 and QF2, and remotely close the demagnetizing switch FMK. Simultaneously, the auxiliary contacts of the demagnetizing switch FMK between pins 1 and 4 and between pins 7 and 8 close. This energizes the first coil KM1, connecting the main power circuit of the main cooling fan, which then starts running. At the same time, the normally closed auxiliary contact of the first coil KM1 disconnects the starting circuit of the auxiliary cooling fan, preventing the second coil KM2 from being energized and thus preventing the auxiliary cooling fan from starting, ensuring priority operation of the main cooling fan. In this situation, the main cooling fan power supplies U1, V1, W1, and N1 lose voltage, the first coil KM1 is de-energized, its normally closed contact closes, the second coil KM2 is energized, the main power circuit of the auxiliary cooling fan is connected, and the auxiliary cooling fan starts running.

[0028] If, after the remote control closes the demagnetizing switch FMK, the auxiliary contacts of the demagnetizing switch FMK between the first and fourth pins and between the seventh and eighth pins fail to close due to a fault, closing the power circuit breakers QF1 and QF2 allows the local switch SA to be switched to position I. This energizes the first coil KM1, connecting the main power circuit of the main cooling fan, and the main cooling fan begins operation. Simultaneously, the normally closed auxiliary contact of the first coil KM1 disconnects the starting circuit of the auxiliary cooling fan, preventing the second coil KM2 from being energized and thus preventing the auxiliary cooling fan from starting, ensuring the main cooling fan operates first. In this situation, the main cooling fan power supplies U1, V1, W1, and N1 lose voltage, the first coil KM1 is de-energized, its normally closed contact closes, the second coil KM2 is energized, the main power circuit of the auxiliary cooling fan is connected, and the auxiliary cooling fan begins operation.

[0029] If, after the remote control closes the demagnetizing switch FMK, the auxiliary contacts of the demagnetizing switch FMK between the first and fourth pins and between the seventh and eighth pins fail to close due to a fault, closing the power circuit breakers QF1 and QF2 allows the local switch SA to be switched from position S to position II. After the second coil KM2 is energized, it connects the main power circuit for the auxiliary cooling fan, and the auxiliary cooling fan starts running. Simultaneously, the normally closed auxiliary contact of the second coil KM2 disconnects the starting circuit for the main cooling fan, preventing the first coil KM1 from being energized and thus preventing the main cooling fan from starting, ensuring priority operation of the auxiliary cooling fan. In this situation, the auxiliary cooling fan power supplies U2, V2, W2, and N2 lose voltage, the second coil KM2 is de-energized, its normally closed contact closes, the first coil KM1 is energized, the main power circuit for the main cooling fan is connected, and the main cooling fan starts running.

[0030] After the excitation system in this embodiment is put into operation, the rectifier cabinet cooling system is automatically activated without human intervention, reducing workload and increasing automation. Implementation requires no cost; the existing demagnetizing switch auxiliary contacts are sufficient to automatically start the rectifier cabinet cooling system, ensuring its normal operation.

[0031] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An automatic start device for the cooling system of the excitation system rectifier cabinet, comprising a first power circuit breaker and a first coil electrically connected to the A-phase, B-phase and C-phase power lines of the main cooling fan, and a second power circuit breaker and a second coil electrically connected to the A-phase, B-phase and C-phase power lines of multiple auxiliary cooling fans. Its features are: It also includes a cooling system start-up control circuit set between a main cooling fan and multiple auxiliary cooling fans. The cooling system start-up control circuit is electrically connected to two auxiliary contacts of a demagnetizing switch. One auxiliary contact of the demagnetizing switch is connected in parallel in the start-up control circuit of the main cooling fan, and the other auxiliary contact of the demagnetizing switch is connected in parallel in the start-up control circuit of the auxiliary cooling fans.

2. The automatic start-up device for the cooling system of the excitation system rectifier cabinet according to claim 1, characterized in that: The cooling system startup includes a switch electrically connected between the main cooling fan and the auxiliary cooling fan. The switch is electrically connected to a first branch line and a second branch line that respectively control the power supply to the main cooling fan and the auxiliary cooling fan. Both the first branch line and the second branch line are grounded.

3. The automatic start-up device for the cooling system of the excitation system rectifier cabinet according to claim 2, characterized in that: The first and third pins of the changeover switch are electrically connected between the first power circuit breaker and the first coil of the A-phase power line of the main cooling fan, and the second and fourth pins of the changeover switch are electrically connected to the first branch line. The fifth and seventh pins of the changeover switch are electrically connected between the second power circuit breaker and the second coil of the A-phase power line of the auxiliary cooling fan, and the sixth and eighth pins of the changeover switch are electrically connected to the second branch line.

4. The automatic start-up device for the cooling system of the excitation system rectifier cabinet according to claim 3, characterized in that: The connection circuit of the first branch line is as follows: the second pin is electrically connected to one end of the normally closed auxiliary contact of the second coil, the other end of the normally closed auxiliary contact of the second coil is electrically connected to one end of the normally closed contact of the first coil, the other end of the normally closed auxiliary contact of the second coil is electrically connected to the fourth pin, the other end of the normally closed auxiliary contact of the second coil is electrically connected to one end of a resistor, the other end of the resistor is electrically connected to one end of a capacitor, and the other end of the capacitor and the other end of the normally closed contact of the first coil are grounded.

5. The automatic start-up device for the cooling system of the excitation system rectifier cabinet according to claim 4, characterized in that: The connection circuit of the second branch line is as follows: the eighth pin is electrically connected to one end of the normally closed auxiliary contact of the first coil, the other end of the normally closed auxiliary contact of the first coil is electrically connected to one end of the normally closed contact of the second coil, the other end of the normally closed auxiliary contact of the first coil is electrically connected to the sixth pin, the other end of the normally closed auxiliary contact of the first coil is electrically connected to one end of another resistor, the other end of the other resistor is electrically connected to one end of another capacitor, and the other end of the other capacitor and the other end of the normally closed contact of the second coil are grounded.

6. The automatic start-up device for the cooling system of the excitation system rectifier cabinet according to claim 5, characterized in that: One auxiliary contact of the demagnetizing switch is electrically connected between the fourth pin and the first pin, and the other auxiliary contact of the demagnetizing switch is electrically connected between the eighth pin and the seventh pin.

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