Double-circuit power supply switching circuit and double-circuit power supply switching system

Abstract

The utility model relates to a double-circuit power supply switching circuit and a double-circuit power supply switching system. The double-circuit power supply switching circuit comprises a first high-voltage power supply line which is connected with the first loop low-voltage distribution cabinet; the second high-voltage power supply line is connected with the second loop low-voltage distribution cabinet; an interconnection switch; the first end of the interconnection switch is connected to a line between the first control switch and the first loop low-voltage distribution cabinet; the second end of the interconnection switch is connected to a line between the second control switch and the second loop low-voltage distribution cabinet; the controller is used for controlling the interlocking state of the first control switch, the second control switch and the interconnection switch according to the first power supply state of the first high-voltage power supply line to the first loop low-voltage distribution cabinet and the second power supply state of the second high-voltage power supply line to the second loop low-voltage distribution cabinet. Therefore, important equipment in an enterprise or a workshop can be in a power-on state, and the operation efficiency of the enterprise or the workshop can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of industrial control technology, and in particular to a dual-power supply switching circuit and a dual-power supply switching system. Background Art

[0002] The power distribution system is a crucial component of the electricity supply and plays a crucial role in ensuring its stability and security. Widely used across various sectors, including homes, businesses, industry, and agriculture, the system provides a favorable power environment and guaranteed power supply, driving socioeconomic development. With technological advancements, the power distribution system is constantly evolving and improving. This is especially true for specialized workshops, where power distribution has unique requirements. For example, refrigerated storage of finished products requires that some equipment maintains power without prolonged interruptions. Such an outage could result in significant economic losses and negatively impact the business. Utility Model Content

[0003] In view of this, embodiments of the present disclosure provide a dual-power supply switching circuit and a dual-power supply switching system.

[0004] The technical solution of the present disclosure is achieved as follows:

[0005] In a first aspect, the present disclosure provides a dual-power supply switching circuit.

[0006] The dual-power supply switching circuit provided by the embodiment of the present disclosure includes:

[0007] A first high-voltage power supply line is connected to a first-circuit low-distribution cabinet; wherein the first high-voltage power supply line is used to supply power to the first-circuit low-distribution cabinet after the voltage is stepped down by a transformer;

[0008] A second high-voltage power supply line is connected to the second circuit low-profile cabinet; wherein the second high-voltage power supply line is used to supply power to the second circuit low-profile cabinet after the voltage is stepped down by the transformer;

[0009] The first control switch is located between the first high-voltage power supply line and the connection line of the first circuit low-distribution cabinet; the second control switch is located between the second high-voltage power supply line and the connection line of the second circuit low-distribution cabinet;

[0010] Tie switch; the first end of the tie switch is connected to the line between the first control switch and the first circuit low-distribution cabinet; the second end of the tie switch is connected to the line between the second control switch and the second circuit low-distribution cabinet;

[0011] A controller is connected to the first high-voltage power supply line and the second high-voltage power supply line, and is used to obtain the first power supply status of the first high-voltage power supply line to the first circuit low-distribution cabinet and the second power supply status of the second high-voltage power supply line to the second circuit low-distribution cabinet, and to control the interlocking status of the first control switch, the second control switch and the connecting switch to determine that the first circuit low-distribution cabinet and the second circuit low-distribution cabinet are both in the power-on state.

[0012] In some embodiments, a first high-voltage switch and a first transformer are provided between the first high-voltage power supply line and the first circuit low-voltage distribution cabinet; wherein the first high-voltage switch is connected to the first transformer; the first transformer is used to reduce the high voltage input by the first high-voltage power supply line; and the first control switch is located between the first transformer and the first circuit low-voltage distribution cabinet.

[0013] A second high-voltage switch and a second transformer are provided between the second high-voltage power supply line and the second circuit low-distribution cabinet; wherein, the second high-voltage switch is connected to the second transformer; the second transformer is used to reduce the high voltage input by the second high-voltage power supply line; the second control switch is located between the second transformer and the second circuit low-distribution cabinet.

[0014] In some embodiments, the first circuit low-profile cabinet is connected to a first load; the second circuit low-profile cabinet is connected to a second load; wherein both the first load and the second load include multiple types of electrical equipment;

[0015] Wherein, at least one electrical device is equipped with a load unloading module;

[0016] Wherein, the load unloading module includes: an external control circuit and a load switch;

[0017] The external control circuit is connected to the controller and the load switch; the load switch is connected to the power supply line between the electrical equipment and the first circuit low-profile cabinet or the power supply line between the electrical equipment and the second circuit low-profile cabinet;

[0018] The controller is used to control the load switch of at least one of the electrical equipment to be in the open state through the external control circuit when the first power supply state of the first high-voltage power supply line to the first circuit low-distribution cabinet is in the power-off state, or the second power supply state of the second high-voltage power supply line to the second circuit low-distribution cabinet is in the power-off state.

[0019] In some embodiments, the external control circuit includes:

[0020] An external power supply, a main control relay, a time delay relay, a first relay, and a shunt trip coil; wherein the time delay relay is connected in parallel with the first relay and then connected in series with the main control relay to the positive and negative poles of the external power supply;

[0021] The first relay and the shunt trip coil are connected in series within the positive and negative poles of the external power supply;

[0022] The load switch is connected in series in the loop of the shunt tripping coil;

[0023] The controller is connected to the main control relay;

[0024] The controller is configured to control the main control relay to close so that the first relay is energized and the shunt trip coil is energized at the same time, thereby tripping the load switch;

[0025] The time delay relay is used to delay for a predetermined time to de-energize the first relay after the first relay is energized.

[0026] In some embodiments, the controller is configured to, when the first power supply state of the first high-voltage power supply line to the first circuit low-distribution cabinet is in a power-off state, adjust the first control switch to an open state and the tie switch to a closed state, so that the second high-voltage power supply line supplies power to the first circuit low-distribution cabinet; or

[0027] When the second power supply state of the second high-voltage power supply line to the second circuit low-distribution cabinet is in the power-off state, the second control switch is adjusted to the open state and the connecting switch is adjusted to the closed state so that the first high-voltage power supply line supplies power to the second circuit low-distribution cabinet.

[0028] In some embodiments, the controller is configured to, when the first high-voltage power supply line is powered on, control the tie switch to be in an open state and the first control switch to be in a closed state, so that the first high-voltage power supply line resumes power supply to the first circuit low-profile cabinet; or

[0029] When the second high-voltage power supply line is powered on, the connecting switch is regulated to be in the open state and the second control switch is regulated to be in the closed state, so that the second high-voltage power supply line resumes supplying power to the second circuit low-profile cabinet.

[0030] In some embodiments, including:

[0031] A first mutual inductor; the first mutual inductor is connected to the first control switch and the controller; the controller is configured to obtain a first power supply state of the first high-voltage power supply line to the first circuit low-profile cabinet through the first mutual inductor;

[0032] A second mutual inductor; the second mutual inductor is connected to the second control switch and the controller; the controller is used to obtain the second power supply state of the second high-voltage power supply line to the second circuit low-profile cabinet through the second mutual inductor.

[0033] In some embodiments, including:

[0034] One of the first relays includes a plurality of normally open contacts connected in parallel;

[0035] Wherein, one of the normally open contacts and one of the shunt tripping coils are connected in series in the positive and negative poles of the external power supply.

[0036] In a second aspect, the present disclosure provides a dual-power supply switching system, comprising:

[0037] The dual-power supply switching circuit described in the first aspect above;

[0038] The electrical equipment is connected to the first circuit low-profile cabinet or the second circuit low-profile cabinet of the dual-circuit power supply switching circuit;

[0039] The dual-path power supply switching circuit is used to supply power to the electrical equipment.

[0040] The dual-circuit power supply switching circuit provided by the embodiment of the present disclosure includes: a first high-voltage power supply line connected to a first-circuit low-distribution cabinet; wherein the first high-voltage power supply line is used to supply power to the first-circuit low-distribution cabinet after reducing the voltage through a transformer; a second high-voltage power supply line connected to the second-circuit low-distribution cabinet; wherein the second high-voltage power supply line is used to supply power to the second-circuit low-distribution cabinet after reducing the voltage through a transformer; a first control switch located between the first high-voltage power supply line and the connection line of the first-circuit low-distribution cabinet; a second control switch located between the second high-voltage power supply line and the connection line of the second-circuit low-distribution cabinet; a connecting switch; a first end of the connecting switch is connected to the line between the first control switch and the first-circuit low-distribution cabinet; a second end of the connecting switch is connected to the line between the second control switch and the second-circuit low-distribution cabinet; a controller connected to the first high-voltage power supply line and the second high-voltage power supply line, and used to obtain a first power supply state of the first high-voltage power supply line to the first-circuit low-distribution cabinet and a second power supply state of the second high-voltage power supply line to the second-circuit low-distribution cabinet, and to control the interlocking state of the first control switch, the second control switch, and the connecting switch to ensure that both the first-circuit low-distribution cabinet and the second-circuit low-distribution cabinet are in a powered-on state. In the present application, the controller interlocks and controls the first control switch, the second control switch and the connecting switch according to the first power supply state of the first high-voltage power supply line to the first-circuit low-configuration cabinet and the second power supply state of the second high-voltage power supply line to the second-circuit low-configuration cabinet, so that when one line of the first high-voltage power supply line and the second high-voltage power supply line is powered off, the first-circuit low-configuration cabinet and the second-circuit low-configuration cabinet can be powered on at the same time through another line, so that both the first-circuit low-configuration cabinet and the second-circuit low-configuration cabinet are in the powered-on state, which is beneficial for important equipment in the enterprise or workshop to be in the powered-on state, and further beneficial to the operating efficiency of the enterprise or workshop, and reduces the power outage and shutdown of important equipment.

[0041] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of a dual-power supply switching circuit structure according to an exemplary embodiment is shown. Figure 1 ;

[0043] Figure 2 A schematic diagram of a dual-power supply switching circuit structure according to an exemplary embodiment is shown. Figure 2 ;

[0044] Figure 3 This is a partial schematic diagram of a load unloading module of a dual power supply switching circuit according to an exemplary embodiment. Figure 1 ;

[0045] Figure 4This is a partial schematic diagram of a load unloading module of a dual power supply switching circuit according to an exemplary embodiment. Figure 2 ;

[0046] Figure 5 The figure is a flow chart of a dual power supply switching method according to an exemplary embodiment.

[0047] Reference numerals

[0048] 01. First high-voltage power supply line; 02. Second high-voltage power supply line; 03. First transformer; 04. Second transformer; 05. First control switch; 06. Second control switch; 07. Contact switch; 08. Controller; 09. First circuit low-profile cabinet; 10. Second circuit low-profile cabinet; 11. First high-voltage switch; 12. Second high-voltage switch; 13. First load; 14. Second load; 15. Load switch; 30. Main control relay; 31. Main control relay; 32. Main control relay; 33. Time delay relay; 34. Time delay relay; 35. Time delay relay; 36. First relay; 37. First relay; 38. First relay. DETAILED DESCRIPTION

[0049] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0050] The power distribution system is a crucial component of the electricity supply and plays a crucial role in ensuring its stability and security. Widely used across various sectors, including homes, businesses, industry, and agriculture, the system provides a favorable power environment and guaranteed power supply, driving socioeconomic development. With technological advancements, the power distribution system is constantly evolving and improving. This is especially true for specialized workshops, where power distribution has unique requirements. For example, refrigerated storage of finished products requires that some equipment maintains power without prolonged interruptions. Such an outage could result in significant economic losses and negatively impact the business.

[0051] In view of the above situation, the present disclosure provides a dual-power supply switching circuit. Figure 1 A schematic diagram of a dual-power supply switching circuit structure according to an exemplary embodiment is shown. Figure 1 .like Figure 1 As shown, the dual power supply switching circuit includes:

[0052] The first high-voltage power supply line 01 is connected to the first circuit low-distribution cabinet 09; wherein the first high-voltage power supply line 01 is used to supply power to the first circuit low-distribution cabinet 09 after the voltage is stepped down by the transformer;

[0053] The second high-voltage power supply line 02 is connected to the second circuit low-profile cabinet 10; wherein the second high-voltage power supply line 02 is used to supply power to the second circuit low-profile cabinet 10 after the voltage is stepped down by the transformer;

[0054] The first control switch 05 is located between the connection line of the first high-voltage power supply line 01 and the first circuit low-distribution cabinet 09; the second control switch 06 is located between the connection line of the second high-voltage power supply line 02 and the second circuit low-distribution cabinet 10;

[0055] Contact switch 07; the first end of the contact switch 07 is connected to the line between the first control switch 05 and the first circuit low-distribution cabinet 09; the second end of the contact switch 07 is connected to the line between the second control switch 06 and the second circuit low-distribution cabinet 10;

[0056] The controller 08 is connected to the first high-voltage power supply line 01 and the second high-voltage power supply line 02, and is used to control the interlocking state of the first control switch 05, the second control switch 06 and the connecting switch 07 according to the first power supply state of the first high-voltage power supply line 01 to the first circuit low-distribution cabinet 09 and the second power supply state of the second high-voltage power supply line 02 to the second circuit low-distribution cabinet 10, so as to ensure that the first circuit low-distribution cabinet 09 and the second circuit low-distribution cabinet 10 are both in the power-on state.

[0057] In this exemplary embodiment, the first control switch 05, the second control switch 06, and the tie switch 07 are interlocking switches that can be interlocked and controlled by the controller 08. The first control switch 05, the second control switch 06, and the tie switch 07 are all connected to the controller 08 and can automatically operate in conjunction with each other under the control of the controller 08. For example, when the first control switch 05 is opened, the tie switch 07 can automatically close; and when the second control switch 06 is opened, the tie switch 07 can automatically close. The first control switch 05, the second control switch 06, and the tie switch 07 cannot all be in the closed state. That is, at least one of the three switches must be in the open state while the other two are in the closed state, thereby achieving interlocking control among the three switches.

[0058] In this exemplary embodiment, the controller 08 interlocks and controls the first control switch 05, the second control switch 06 and the connecting switch 07 according to the first power supply state of the first high-voltage power supply line 01 to the first-circuit low-distribution cabinet 09 and the second power supply state of the second high-voltage power supply line 02 to the second-circuit low-distribution cabinet 10, so that when one line of the first high-voltage power supply line 01 and the second high-voltage power supply line 02 is powered off, the first-circuit low-distribution cabinet 09 and the second-circuit low-distribution cabinet 10 can be powered on simultaneously through another line, so that the first-circuit low-distribution cabinet 09 and the second-circuit low-distribution cabinet 10 are both powered on, which is beneficial for important equipment in the enterprise or workshop to be powered on, and further beneficial for the operating efficiency of the enterprise or workshop, and reduces the power outage and shutdown of important equipment.

[0059] In some embodiments, Figure 2 A schematic diagram of a dual-power supply switching circuit structure according to an exemplary embodiment is shown. Figure 2 .like Figure 2 As shown, a first high-voltage switch 11 and a first transformer 03 are provided between the first high-voltage power supply line 01 and the first circuit low-distribution cabinet 09; wherein the first high-voltage switch 11 is connected to the first transformer 03; the first transformer 03 is used to reduce the high voltage inputted by the first high-voltage power supply line 01; the first control switch 05 is located between the first transformer 03 and the first circuit low-distribution cabinet 09;

[0060] A second high-voltage switch 12 and a second transformer 04 are provided between the second high-voltage power supply line 02 and the second circuit low-distribution cabinet 10; wherein, the second high-voltage switch 12 is connected to the second transformer 04; the second transformer 04 is used to reduce the voltage of the high voltage input by the second high-voltage power supply line 02; the second control switch 06 is located between the second transformer 04 and the second circuit low-distribution cabinet 10.

[0061] In this exemplary embodiment, the first transformer 03 is used to step down the high voltage input from the first high-voltage power supply line 01, converting the high voltage input from the first high-voltage power supply line 01 into low voltage electricity, thereby supplying power to the first circuit low-voltage distribution cabinet 09. When a short circuit fault occurs in the first transformer 03, the first high-voltage switch 11 can trip to protect the first circuit low-voltage distribution cabinet 09.

[0062] In this exemplary embodiment, the second transformer 04 is used to step down the high voltage input from the second high-voltage power supply line 02, converting the high voltage input from the second high-voltage power supply line 02 into low voltage electricity, thereby supplying power to the second circuit low-distribution cabinet 10. When a short circuit fault occurs in the second transformer 04, the second high-voltage switch 12 can trip to protect the second circuit low-distribution cabinet 10.

[0063] In some embodiments, the first circuit low-profile cabinet 09 is connected to a first load 13; the second circuit low-profile cabinet 10 is connected to a second load 14; wherein the first load 13 and the second load 14 both include various types of electrical equipment;

[0064] Wherein, at least one electrical device is equipped with a load unloading module;

[0065] Wherein, the load unloading module includes: an external control circuit and a load switch 15;

[0066] The external control circuit is connected to the controller 08 and the load switch 15; the load switch 15 is connected to the power supply line between the electrical equipment and the first circuit low-profile cabinet 09 or the power supply line between the electrical equipment and the second circuit low-profile cabinet 10;

[0067] The controller 08 is used to control the load switch 15 of at least one of the electrical equipment to be in the open state through the external control circuit when the first power supply state of the first high-voltage power supply line 01 to the first circuit low-distribution cabinet 09 is in the power-off state, or the second power supply state of the second high-voltage power supply line 02 to the second circuit low-distribution cabinet 10 is in the power-off state.

[0068] In this exemplary embodiment, controller 08 can use a load unloading module to unload electrical equipment connected to first-circuit low-profile cabinet 09 and second-circuit low-profile cabinet 10. This allows unnecessary load unloading to occur when a power outage occurs on either first high-voltage power supply line 01 or second high-voltage power supply line 02, thereby ensuring power supply to critical equipment. Controller 08 can send a load unloading control signal to an external control circuit, triggering the opening of load switch 15 to achieve load unloading.

[0069] In some embodiments, Figure 3 This is a partial schematic diagram of a load unloading module of a dual power supply switching circuit according to an exemplary embodiment. Figure 1 . Figure 4 This is a partial schematic diagram of a load unloading module of a dual power supply switching circuit according to an exemplary embodiment. Figure 2 .like Figure 3 、 4 As shown, the external control circuit includes:

[0070] External power supply UPS, main control relay 30, time delay relay 33, first relay 36 and shunt trip coil A2; wherein, after the time delay relay 33 and the first relay 36 are connected in parallel, they are connected in series with the main control relay 30 in the positive and negative poles of the external power supply UPS; wherein, Figure 3The main control relays shown include a main control relay 30 between ① and ②, a main control relay 31 between ④ and ⑤, and a main control relay 32 between ⑦ and ⑧. The time delay relays include a time delay relay 33, a time delay relay 34, and a time delay relay 35. The first relays include a first relay 36, a first relay 37, and a first relay 38.

[0071] The first relay 36 and the shunt trip coil A2 are connected in series in the positive and negative poles of the external power supply UPS;

[0072] The load switch 15 is connected in series in the loop of the shunt tripping coil A2;

[0073] The controller 08 is connected to the main control relay 30;

[0074] The controller 08 is configured to control the main control relay 30 to be closed, so that the first relay 36 is energized and the shunt trip coil A2 is energized at the same time, thereby tripping the load switch 15;

[0075] The time delay relay 33 is used to delay for a predetermined time period to de-energize the first relay 36 after the first relay 36 is energized.

[0076] In this exemplary embodiment, the external control circuit may include: an external power supply, a main control relay 30, a time delay relay 33, a first relay 36 and a shunt tripping coil A2. The time delay relay 33 is connected in parallel with the first relay 36 and then connected in series with the main control relay 30 in the positive and negative poles of the external power supply; the first relay 36 and the shunt tripping coil A2 are connected in series in the positive and negative poles of the external power supply; the load switch 15 is connected in series in the loop of the shunt tripping coil A2; and the controller 08 is connected to the main control relay 30. Figure 2 As shown, when the controller 08 triggers the main control relay 30 to close, the time delay relay 33 and the first relay 36 can be energized. When the first relay 36 is energized, the normally open contact K1 ( Figure 4 The K1 shown is closed, thereby energizing the shunt trip coil A2. When the shunt trip coil A2 is energized, the load switch 15 connected in series in the shunt trip coil A2 energization circuit will trip and de-energize, thereby achieving load unloading. When the first relay 36 is energized, the delay relay 33 is also energized, causing the switch KT1 of the delay relay to open after a predetermined delay time, thereby de-energizing the first relay and, in turn, the shunt trip coil A2. This improves the power-on safety of the shunt trip coil and reduces the risk of burnout due to excessive power-on time. The predetermined time can be a very short time, such as 1 to 2 seconds.

[0077] For example, consider a dual 4000 kVA + 4000 kVA normal supply circuit, totaling 8000 kVA capacity. Under normal circumstances, the low-voltage busbar switching mode provides 8000 kVA for the entire plant. In the event of a power outage on one circuit, the other circuit can provide 4000 kVA. In this situation, it is necessary to be able to disconnect power to non-essential circuits while ensuring power to essential circuits. When the 8000 kVA capacity drops to 4000 kVA after a power outage on one circuit, the load needs to be reduced by half. Therefore, controller 08 can be used to trip load switches 15 on non-critical equipment, thereby offloading these non-essential devices.

[0078] In some embodiments, the controller 08 is configured to, when the first power supply state of the first high-voltage power supply line 01 to the first circuit low-distribution cabinet 09 is in a power-off state, adjust the first control switch 05 to an open state and the contact switch 07 to a closed state, so that the second high-voltage power supply line 02 supplies power to the first circuit low-distribution cabinet 09; or,

[0079] When the second power supply state of the second high-voltage power supply line 02 to the second-circuit low-distribution cabinet 10 is in the power-off state, the second control switch 06 is adjusted to the open state and the connecting switch 07 is adjusted to the closed state, so that the first high-voltage power supply line 01 supplies power to the second-circuit low-distribution cabinet 10.

[0080] In this exemplary embodiment, under normal circumstances, the first high-voltage power supply line 01 supplies power to the first-circuit low-distribution cabinet 09, and the second high-voltage power supply line 02 supplies power to the second-circuit low-distribution cabinet 10. When a power outage occurs on one of the first and second high-voltage power supply lines 01 and 02, the controller 08 can regulate the interlocking state between the first control switch 05, the second control switch 06, and the tie switch 07, so that one high-voltage power supply line supplies power to the first and second circuit low-distribution cabinets 09 and 10. For example, when the first power supply state of the first high-voltage power supply line 01 to the first circuit low-distribution cabinet 09 is a power-off state, the first control switch 05 is regulated to be open and the tie switch 07 is regulated to be closed so that the second high-voltage power supply line 02 supplies power to the first circuit low-distribution cabinet 09; or, when the second power supply state of the second high-voltage power supply line 02 to the second circuit low-distribution cabinet 10 is a power-off state, the second control switch 06 is regulated to be open and the tie switch 07 is regulated to be closed so that the first high-voltage power supply line 01 supplies power to the second circuit low-distribution cabinet 10.

[0081] In some embodiments, the controller 08 is used to control the connecting switch 07 to be in the open state and the first control switch 05 to be in the closed state when the first high-voltage power supply line 01 is powered on, so that the first high-voltage power supply line 01 can resume power supply to the first circuit low-distribution cabinet 09; or, when the second high-voltage power supply line 02 is powered on, control the connecting switch 07 to be in the open state and the second control switch 06 to be in the closed state, so that the second high-voltage power supply line 02 can resume power supply to the second circuit low-distribution cabinet 10.

[0082] In this exemplary embodiment, when a high-voltage power supply line that was de-energized is restored to power, the interlocking state among the first control switch 05, the second control switch 06, and the connecting switch 07 can be adjusted by the controller 08, so as to realize the power supply state in which, under normal circumstances, the first high-voltage power supply line 01 supplies power to the first-circuit low-distribution cabinet 09 and the second high-voltage power supply line 02 supplies power to the second-circuit low-distribution cabinet 10. For example, when the first high-voltage power supply line 01 is powered on, the connecting switch 07 is adjusted to an open state and the first control switch 05 is adjusted to a closed state so that the first high-voltage power supply line 01 resumes powering the first-circuit low-distribution cabinet 09; or, when the second high-voltage power supply line 02 is powered on, the connecting switch 07 is adjusted to an open state and the second control switch 06 is adjusted to a closed state so that the second high-voltage power supply line 02 resumes powering the second-circuit low-distribution cabinet 10.

[0083] In some embodiments, including:

[0084] The first transformer is connected to the first control switch 05 and the controller 08; the controller 08 is used to obtain the first power supply state of the first high-voltage power supply line 01 to the first circuit low-profile cabinet 09 through the first transformer;

[0085] The second transformer is connected to the second control switch 06 and the controller 08; the controller 08 is used to obtain the second power supply state of the second high-voltage power supply line 02 to the second circuit low-profile cabinet 10 through the second transformer.

[0086] In this exemplary embodiment, the mutual inductor operates based on the principle of AC electromagnetic induction. Different coils are wound around each side of a highly magnetically permeable ring conductor, inducing different voltages and currents on the other side. This allows AC voltages and high currents to be proportionally reduced to values that can be directly measured with an instrument, facilitating direct measurement while also providing power for relay protection and automatic devices. In this application, the first power supply status of the first high-voltage power supply line 01 to the first circuit low-profile cabinet 09 can be obtained via a first mutual inductor. The second power supply status of the second high-voltage power supply line 02 to the second circuit low-profile cabinet 10 can be obtained via a second mutual inductor.

[0087] In some embodiments, including:

[0088] One of the first relays includes a plurality of normally open contacts connected in parallel;

[0089] Wherein, one of the normally open contacts and one of the shunt tripping coils are connected in series in the positive and negative poles of the external power supply.

[0090] In this exemplary embodiment, Figure 3 As shown, when the controller 08 triggers the main control relay to close, the time delay relay and the first relay can be energized. When the first relay is energized, the normally open contact of the first relay ( Figure 4 The K1 shown is closed, thereby energizing the shunt trip coil. When the shunt trip coil is energized, the load switch 15 connected in series in the shunt trip coil energizing circuit will trip and de-energize, thereby achieving load unloading. When the first relay is energized, the time delay relay is also energized, causing the switch KT1 of the time delay relay to open after a predetermined delay time, thereby de-energizing the first relay and, in turn, the shunt trip coil. This improves the power-on safety of the shunt trip coil and reduces the risk of burnout due to excessive power-on time. The predetermined time length can be a very short time, such as 1 to 2 seconds.

[0091] The present disclosure provides a dual-circuit power supply switching method, which is applied to a dual-circuit power supply switching circuit, wherein the dual-circuit power supply switching circuit includes: a first high-voltage power supply line 01, connected to a first-circuit low-distribution cabinet 09; wherein the first high-voltage power supply line 01 is used to supply power to the first-circuit low-distribution cabinet 09 after reducing the voltage through a transformer; a second high-voltage power supply line 02, connected to a second-circuit low-distribution cabinet 10; wherein the second high-voltage power supply line 02 is used to supply power to the second-circuit low-distribution cabinet 10 after reducing the voltage through a transformer; a first control switch 05, located between the connection line between the first high-voltage power supply line 01 and the first-circuit low-distribution cabinet 09; a second control switch 06, located between the connection line between the second high-voltage power supply line 02 and the second-circuit low-distribution cabinet 10; a connecting switch 07; a first end of the connecting switch 07 is connected to the line between the first control switch 05 and the first-circuit low-distribution cabinet 09; a second end of the connecting switch 07 is connected to the line between the second control switch 06 and the second-circuit low-distribution cabinet 10; and a controller 08, connected to the first high-voltage power supply line 01 and the second high-voltage power supply line 02. Figure 5 FIG. 1 is a flow chart of a dual power supply switching method according to an exemplary embodiment. Figure 5 As shown in FIG, the dual power supply switching method process includes:

[0092] Step 50: Obtain a first power supply status of the first high-voltage power supply line to the first circuit low-profile cabinet and a second power supply status of the second high-voltage power supply line to the second circuit low-profile cabinet;

[0093] Step 51: According to the first power supply state of the first high-voltage power supply line to the first circuit low-distribution cabinet and the second power supply state of the second high-voltage power supply line to the second circuit low-distribution cabinet, the interlocking state of the first control switch, the second control switch and the connecting switch are controlled by the controller to ensure that the first circuit low-distribution cabinet and the second circuit low-distribution cabinet are both in the power-on state.

[0094] In this exemplary embodiment, the first control switch 05, the second control switch 06, and the tie switch 07 are interlocking switches. Each of these three switches is connected to a controller 08, enabling interlocking control by the controller 08. For example, when the first control switch 05 is opened, the tie switch 07 automatically closes; and when the second control switch 06 is opened, the tie switch 07 automatically closes. Furthermore, the first control switch 05, the second control switch 06, and the tie switch 07 cannot all be in the closed state. In other words, at least one of these switches must be in the open state while the other two are in the closed state, thereby achieving interlocking control among the three.

[0095] In this exemplary embodiment, the controller 08 interlocks and controls the first control switch 05, the second control switch 06 and the connecting switch 07 according to the first power supply state of the first high-voltage power supply line 01 to the first-circuit low-distribution cabinet 09 and the second power supply state of the second high-voltage power supply line 02 to the second-circuit low-distribution cabinet 10, so that when one line of the first high-voltage power supply line 01 and the second high-voltage power supply line 02 is powered off, the first-circuit low-distribution cabinet 09 and the second-circuit low-distribution cabinet 10 can be powered on simultaneously through another line, so that the first-circuit low-distribution cabinet 09 and the second-circuit low-distribution cabinet 10 are both powered on, which is beneficial for important equipment in the enterprise or workshop to be powered on, and further beneficial for the operating efficiency of the enterprise or workshop, and reduces the power outage and shutdown of important equipment.

[0096] In some embodiments, according to the first power supply state of the first high-voltage power supply line 01 to the first circuit low-distribution cabinet 09 and the second power supply state of the second high-voltage power supply line 02 to the second circuit low-distribution cabinet 10, the interlocking state of the first control switch 05, the second control switch 06 and the tie switch 07 is controlled by the controller 08 to determine that the first circuit low-distribution cabinet 09 and the second circuit low-distribution cabinet 10 are both in the power-on state, including:

[0097] When the first power supply state of the first high-voltage power supply line 01 to the first circuit low-distribution cabinet 09 is in a power-off state, the first control switch 05 is controlled by the controller 08 to be in an open state and the contact switch 07 is in a closed state, so that the second high-voltage power supply line 02 supplies power to the first circuit low-distribution cabinet 09; or,

[0098] When the second power supply state of the second high-voltage power supply line 02 to the second-circuit low-distribution cabinet 10 is in the power-off state, the second control switch 06 is controlled to be in the open state and the connecting switch 07 is in the closed state through the controller 08, so that the first high-voltage power supply line 01 supplies power to the second-circuit low-distribution cabinet 10.

[0099] In this exemplary embodiment, under normal circumstances, the first high-voltage power supply line 01 supplies power to the first-circuit low-distribution cabinet 09, and the second high-voltage power supply line 02 supplies power to the second-circuit low-distribution cabinet 10. When a power outage occurs on one of the first and second high-voltage power supply lines 01 and 02, the controller 08 can regulate the interlocking state between the first control switch 05, the second control switch 06, and the tie switch 07, so that one high-voltage power supply line supplies power to the first and second circuit low-distribution cabinets 09 and 10. For example, when the first power supply state of the first high-voltage power supply line 01 to the first circuit low-distribution cabinet 09 is a power-off state, the first control switch 05 is regulated to be open and the tie switch 07 is regulated to be closed so that the second high-voltage power supply line 02 supplies power to the first circuit low-distribution cabinet 09; or, when the second power supply state of the second high-voltage power supply line 02 to the second circuit low-distribution cabinet 10 is a power-off state, the second control switch 06 is regulated to be open and the tie switch 07 is regulated to be closed so that the first high-voltage power supply line 01 supplies power to the second circuit low-distribution cabinet 10.

[0100] In some embodiments, the first circuit low-profile cabinet 09 is connected to a first load 13; the second circuit low-profile cabinet 10 is connected to a second load 14; wherein the first load 13 and the second load 14 both include various types of electrical equipment;

[0101] Wherein, at least one electrical device is equipped with a load unloading module;

[0102] The method comprises:

[0103] When one of the first high-voltage power supply line 01 and the second high-voltage power supply line 02 is in a power-off state, and the first-loop low-profile cabinet 09 and the second-loop low-profile cabinet 10 are simultaneously powered through one line, the predetermined electrical equipment is powered off based on the load unloading module to reduce the power load of the first-loop low-profile cabinet 09 and / or the second-loop low-profile cabinet 10.

[0104] In this exemplary embodiment, the load unloading module includes: an external control circuit, a load switch 15;

[0105] The external control circuit is connected to the controller 08 and the load switch 15; the load switch 15 is connected to the power supply line between the electrical equipment and the first circuit low-profile cabinet 09 or the power supply line between the electrical equipment and the second circuit low-profile cabinet 10;

[0106] The controller 08 is used to control the load switch 15 of at least one of the electrical equipment to be in the open state through the external control circuit when the first power supply state of the first high-voltage power supply line 01 to the first circuit low-distribution cabinet 09 is in the power-off state, or the second power supply state of the second high-voltage power supply line 02 to the second circuit low-distribution cabinet 10 is in the power-off state.

[0107] In this exemplary embodiment, controller 08 can use a load unloading module to unload electrical equipment connected to first-circuit low-profile cabinet 09 and second-circuit low-profile cabinet 10. This allows unnecessary load unloading to occur when a power outage occurs on either first high-voltage power supply line 01 or second high-voltage power supply line 02, thereby ensuring power supply to critical equipment. The controller can send a load unloading control signal to an external control circuit, triggering the opening of load switch 15 to achieve load unloading.

[0108] In some embodiments, the powering off of predetermined electrical equipment based on the load unloading module to reduce the power load of the first circuit low-profile cabinet 09 and / or the second circuit low-profile cabinet 10 includes:

[0109] Prioritize power outages for electrical equipment based on their importance to the power system;

[0110] When powering off a predetermined electrical device based on the load unloading module, the electrical device with a high priority for powering off is determined to be the predetermined electrical device, so as to power off the device; wherein, the lower the importance of the electrical device to the power system, the higher the power-off priority of the electrical device.

[0111] In this exemplary embodiment, for example, an enterprise or workshop includes refrigeration equipment, lighting equipment, and so on. Since refrigeration equipment is more important to the enterprise's operations than lighting equipment, the lighting equipment can be powered off first, that is, the refrigeration equipment is set to the lowest power-off priority, and the lighting equipment is set to the highest power-off priority. Based on the priority sorting, the load can be unloaded first for the lighting equipment with the highest priority. This helps to ensure the normal power supply of important equipment. Specifically, in this application, when unloading power-consuming equipment, automatic tripping and unloading can be performed according to the pre-set power-off priority. After the automatic tripping and unloading is performed according to the pre-set power-off priority, adjustments can be made according to actual needs at the time to meet the current power supply and equipment operation requirements.

[0112] The present disclosure provides a dual-circuit power supply switching system, comprising:

[0113] The dual power supply switching circuit described in the above embodiments;

[0114] The electrical equipment is connected to the first circuit low-profile cabinet or the second circuit low-profile cabinet of the dual-circuit power supply switching circuit;

[0115] The dual-path power supply switching circuit is used to supply power to the electrical equipment.

[0116] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can retrieve and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing it in a suitable manner if necessary, and then storing it in a computer memory.

[0117] It should be understood that various parts of the present disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0118] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0119] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0120] In addition, the terms "first" and "second" used in the embodiments of the present disclosure are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined in the embodiments of the present disclosure with terms such as "first" and "second" can explicitly or implicitly indicate that the embodiment includes at least one such feature. In the description of the present disclosure, the word "plurality" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0121] In this disclosure, unless otherwise clearly specified or limited in the embodiments, the terms "installed," "connected," "connect," and "fixed" appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection. It can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two elements, or the interaction between two elements. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood based on the specific implementation.

[0122] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0123] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A dual-power supply switching circuit, characterized in that: include: A first high-voltage power supply line is connected to a first-circuit low-distribution cabinet; wherein the first high-voltage power supply line is used to supply power to the first-circuit low-distribution cabinet after the voltage is stepped down by a transformer; A second high-voltage power supply line is connected to the second circuit low-profile cabinet; wherein the second high-voltage power supply line is used to supply power to the second circuit low-profile cabinet after the voltage is stepped down by the transformer; The first control switch is located between the first high-voltage power supply line and the connection line of the first circuit low-distribution cabinet; the second control switch is located between the second high-voltage power supply line and the connection line of the second circuit low-distribution cabinet; Tie switch; the first end of the tie switch is connected to the line between the first control switch and the first circuit low-distribution cabinet; the second end of the tie switch is connected to the line between the second control switch and the second circuit low-distribution cabinet; A controller is connected to the first high-voltage power supply line and the second high-voltage power supply line, and is used to control the interlocking state of the first control switch, the second control switch and the connecting switch according to the first power supply state of the first high-voltage power supply line to the first circuit low-distribution cabinet and the second power supply state of the second high-voltage power supply line to the second circuit low-distribution cabinet, so as to determine that the first circuit low-distribution cabinet and the second circuit low-distribution cabinet are both in the power-on state.

2. The dual power supply switching circuit according to claim 1, wherein: A first high-voltage switch and a first transformer are provided between the first high-voltage power supply line and the first circuit low-voltage cabinet; wherein the first high-voltage switch is connected to the first transformer; the first transformer is used to reduce the voltage of the high voltage input by the first high-voltage power supply line; the first control switch is located between the first transformer and the first circuit low-voltage cabinet; A second high-voltage switch and a second transformer are provided between the second high-voltage power supply line and the second circuit low-distribution cabinet; wherein, the second high-voltage switch is connected to the second transformer; the second transformer is used to reduce the high voltage input by the second high-voltage power supply line; the second control switch is located between the second transformer and the second circuit low-distribution cabinet.

3. The dual power supply switching circuit according to claim 1, wherein: The first circuit low-profile cabinet is connected to a first load; the second circuit low-profile cabinet is connected to a second load; wherein the first load and the second load both include various types of electrical equipment; Wherein, at least one electrical device is equipped with a load unloading module; Wherein, the load unloading module includes: an external control circuit and a load switch; The external control circuit is connected to the controller and the load switch; the load switch is connected to the power supply line between the electrical equipment and the first circuit low-profile cabinet or the power supply line between the electrical equipment and the second circuit low-profile cabinet; The controller is used to control the load switch of at least one of the electrical equipment to be in the open state through the external control circuit when the first power supply state of the first high-voltage power supply line to the first circuit low-distribution cabinet is in the power-off state, or the second power supply state of the second high-voltage power supply line to the second circuit low-distribution cabinet is in the power-off state.

4. The dual power supply switching circuit according to claim 3, characterized in that: The external control circuit includes: An external power supply, a main control relay, a time delay relay, a first relay, and a shunt trip coil; wherein the time delay relay is connected in parallel with the first relay and then connected in series with the main control relay to the positive and negative poles of the external power supply; The first relay and the shunt trip coil are connected in series within the positive and negative poles of the external power supply; The load switch is connected in series in the loop of the shunt tripping coil; The controller is connected to the main control relay; The controller is configured to control the main control relay to close so that the first relay is energized and the shunt trip coil is energized at the same time, thereby tripping the load switch; The time delay relay is used to delay for a predetermined time to de-energize the first relay after the first relay is energized.

5. The dual power supply switching circuit according to claim 1, wherein: The controller is used to adjust the first control switch to an open state and the connecting switch to a closed state when the first power supply state of the first high-voltage power supply line to the first circuit low-distribution cabinet is a power-off state, so that the second high-voltage power supply line supplies power to the first circuit low-distribution cabinet; or, When the second power supply state of the second high-voltage power supply line to the second circuit low-distribution cabinet is in the power-off state, the second control switch is adjusted to the open state and the connecting switch is adjusted to the closed state so that the first high-voltage power supply line supplies power to the second circuit low-distribution cabinet.

6. The dual power supply switching circuit according to claim 5, characterized in that: The controller is configured to adjust the tie switch to an open state and the first control switch to a closed state when the first high-voltage power supply line is powered on, so that the first high-voltage power supply line resumes power supply to the first circuit low-profile cabinet; or, When the second high-voltage power supply line is powered on, the connecting switch is regulated to be in the open state and the second control switch is regulated to be in the closed state, so that the second high-voltage power supply line resumes supplying power to the second circuit low-profile cabinet.

7. The dual power supply switching circuit according to claim 1, wherein: include: a first mutual inductor; The first mutual inductor is connected to the first control switch and the controller; The controller is configured to obtain, through the first mutual inductor, a first power supply state of the first high-voltage power supply line to the first circuit low-profile cabinet; A second mutual inductor; the second mutual inductor is connected to the second control switch and the controller; the controller is used to obtain the second power supply state of the second high-voltage power supply line to the second circuit low-profile cabinet through the second mutual inductor.

8. The dual power supply switching circuit according to claim 4, characterized in that: include: One of the first relays includes a plurality of normally open contacts connected in parallel; Wherein, one of the normally open contacts and one of the shunt tripping coils are connected in series in the positive and negative poles of the external power supply.

9. A dual-circuit power supply switching system, characterized in that: include: The dual power supply switching circuit according to any one of claims 1 to 8; The electrical equipment is connected to the first circuit low-profile cabinet or the second circuit low-profile cabinet of the dual-circuit power supply switching circuit; The dual-path power supply switching circuit is used to supply power to the electrical equipment.

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