DC system power distribution switching circuit

Abstract

The present application provides a DC system power distribution switching circuit, which is applied to the power distribution sub-screen of a layered radial power supply system, including: a first bus, a second bus, a third bus and a fourth bus, a first switching switch module and a second switching switch module; the first bus is connected to the first main bus, the second bus is connected to the second main bus, and the first bus and the second bus are connected to the first load; the first bus and the second bus are respectively connected to the input end of the first switching switch module, the output end of the first switching switch module is connected to the third bus, and the third bus is connected to the second load; the first bus and the second bus are respectively connected to the input end of the second switching switch module, the output end of the second switching switch module is connected to the fourth bus, and the fourth bus is connected to the third load. The DC system power distribution switching circuit provided by the present application can ensure the normal operation of all loads when any section of the bus of the power distribution sub-screen fails or exits operation.

Description

Technical Field

[0001] The present application relates to the field of water conservancy and hydropower, and in particular to a direct current system power distribution switching circuit. Background Art

[0002] The DC system of a hydropower station generally adopts a layered radial power supply system, which generally includes the main powerhouse, generator floor, main transformer tunnel and auxiliary powerhouse, etc. The DC system distribution main panel is set in the main powerhouse, and the distribution sub-panels are set in the generator floor, main transformer tunnel and auxiliary powerhouse respectively. Both the distribution main panel and the distribution sub-panel are equipped with two sections of busbars. The power supply load of the unit includes dual power supply load, dual configuration device power supply, single power supply load and emergency braking device.

[0003] In the current DC system of a hydropower station, the two busbars on the distribution panel are connected to the two busbars of the main distribution panel, and they obtain electric energy from the two busbars respectively. For the dual-power supply load and the power supply of the device with a dual configuration, they are connected to the two busbars on the distribution panel respectively, and they obtain electric energy from the two busbars on the distribution panel at the same time; for the single-power supply load and the emergency brake device, they are connected to one of the busbars on the distribution panel in a load-sharing manner. The problem with the current DC system of a hydropower station is that when a busbar on the distribution panel fails, the dual-power supply load and the power supply of the device with a dual configuration can obtain electric energy from the busbar that has not failed, but the single-power supply load and the emergency brake device connected to the busbar will not work, and there will be a failure to exit operation, which is easy to cause an operation accident. Utility Model Content

[0004] The present application provides a DC system power distribution switching circuit, which can ensure the normal operation of all loads when any section of the busbar of the power distribution panel fails or stops operating.

[0005] The DC system power distribution switching circuit provided in the present application is applied to a power distribution sub-panel of a layered radial power supply system, wherein the layered radial power supply system comprises a power distribution main panel and a power distribution sub-panel, wherein the power distribution main panel comprises a first main bus and a second main bus; the power distribution sub-panel comprises: a first bus, a second bus, a third bus and a fourth bus, a first switching switch module and a second switching switch module;

[0006] The positive pole of the first busbar is connected to the positive pole of the first main busbar, and the negative pole of the first busbar is connected to the negative pole of the first main busbar; the positive pole of the second busbar is connected to the positive pole of the second main busbar, and the negative pole of the second busbar is connected to the negative pole of the second main busbar; the first busbar and the second busbar are connected to the first load, and the first load is a dual-power supply load and a dual-configuration device power supply;

[0007] The first bus is connected to the first input end of the first switching switch module, the second bus is connected to the second input end of the first switching switch module, and the output end of the first switching switch module is connected to the third bus; the first switching switch module is used to switch the conduction path between the first bus or the second bus and the third bus, the third bus is connected to the second load, and the second load is a single power supply load;

[0008] The first bus is connected to the first input end of the second switching switch module, the second bus is connected to the second input end of the second switching switch module, and the output end of the second switching switch module is connected to the fourth bus; the second switching switch module is used to switch the conduction path between the first bus or the second bus and the fourth bus, the fourth bus is connected to the third load, and the third load is an emergency braking device.

[0009] In one example, the first switching switch module includes: a first switch, a second switch, a third switch and a fourth switch;

[0010] One end of the first switch is connected to the positive electrode of the first busbar, and the other end of the first switch is connected to the positive electrode of the third busbar;

[0011] One end of the second switch is connected to the negative electrode of the first bus, and the other end of the second switch is connected to the negative electrode of the third bus;

[0012] One end of the third switch is connected to the positive electrode of the second busbar, and the other end of the third switch is connected to the positive electrode of the third busbar;

[0013] One end of the fourth switch is connected to the negative electrode of the second bus, and the other end of the fourth switch is connected to the negative electrode of the third bus.

[0014] In one example, the second switch module includes: a fifth switch, a sixth switch, a seventh switch and an eighth switch;

[0015] One end of the fifth switch is connected to the positive electrode of the first busbar, and the other end of the fifth switch is connected to the positive electrode of the fourth busbar;

[0016] One end of the sixth switch is connected to the negative electrode of the first bus, and the other end of the sixth switch is connected to the negative electrode of the fourth bus;

[0017] One end of the seventh switch is connected to the positive electrode of the second busbar, and the other end of the seventh switch is connected to the positive electrode of the fourth busbar;

[0018] One end of the eighth switch is connected to the negative electrode of the second bus, and the other end of the eighth switch is connected to the negative electrode of the fourth bus.

[0019] In one example, the first switching switch module further includes: a first interlocking device;

[0020] One end of the first interlocking device is connected to the first switch and the second switch respectively, and the other end of the first interlocking device is connected to the third switch and the fourth switch respectively. The first interlocking device is used to close the first switch and the second switch, or to close the third switch and the fourth switch.

[0021] In one example, the second switch module further includes: a second interlocking device;

[0022] One end of the second interlocking device is connected to the fifth switch and the sixth switch respectively, and the other end of the second interlocking device is connected to the seventh switch and the eighth switch respectively. The second interlocking device is used to close the fifth switch and the sixth switch, or to close the seventh switch and the eighth switch.

[0023] In one example, the circuit further includes: at least one first load monitoring module, at least one second load monitoring module, at least one third load monitoring module and at least one fourth load monitoring module;

[0024] The positive input terminal of the first load monitoring module is connected to the positive pole of the first bus, the negative input terminal of the first load monitoring module is connected to the negative pole of the first bus, and the output terminal of the first load monitoring module is connected to the first load;

[0025] The positive input terminal of the second load monitoring module is connected to the positive pole of the second bus, the negative input terminal of the second load monitoring module is connected to the negative pole of the second bus, and the output terminal of the second load monitoring module is connected to the first load;

[0026] The positive input terminal of the third load monitoring module is connected to the positive pole of the third bus, the negative input terminal of the third load monitoring module is connected to the negative pole of the third bus, and the output terminal of the third load monitoring module is connected to the second load;

[0027] The positive input terminal of the fourth load monitoring module is connected to the positive pole of the fourth bus, the negative input terminal of the fourth load monitoring module is connected to the negative pole of the fourth bus, and the output terminal of the fourth load monitoring module is connected to the third load.

[0028] In one example, the first load monitoring module includes: a first indicator light and a first circuit breaker, the second load monitoring module includes: a second indicator light and a second circuit breaker, the third load monitoring module includes: a third indicator light and a third circuit breaker, and the fourth load monitoring module includes: a fourth indicator light and a fourth circuit breaker;

[0029] One end of the first indicator light is connected to the positive input end of the first load monitoring module, and the other end of the first indicator light is connected to the negative input end of the first load monitoring module; the first input end of the first circuit breaker is connected to the positive pole of the first bus, the second input end of the first circuit breaker is connected to the negative pole of the first bus, the first output end of the first circuit breaker is connected to one end of the first indicator light, and the second output end of the first circuit breaker is connected to the other end of the first indicator light, the first circuit breaker is used to conduct the path between the first load and the first bus, the first indicator light is used to be in a first state when the path between the first load and the first bus is conducted, and is used to be in a second state when the path between the first load and the first bus is disconnected;

[0030] One end of the second indicator light is connected to the positive input end of the second load monitoring module, and the other end of the second indicator light is connected to the negative input end of the second load monitoring module; the first input end of the second circuit breaker is connected to the positive pole of the second bus, the second input end of the second circuit breaker is connected to the negative pole of the second bus, the first output end of the second circuit breaker is connected to one end of the second indicator light, and the second output end of the second circuit breaker is connected to the other end of the second indicator light. The second circuit breaker is used to conduct the path between the second load and the second bus, and the second indicator light is used to be in a first state when the path between the second load and the second bus is conducted, and is used to be in a second state when the path between the second load and the second bus is disconnected;

[0031] One end of the third indicator light is connected to the positive input end of the third load monitoring module, and the other end of the third indicator light is connected to the negative input end of the third load monitoring module; the first input end of the third circuit breaker is connected to the positive pole of the third busbar, the second input end of the third circuit breaker is connected to the negative pole of the third busbar, the first output end of the third circuit breaker is connected to one end of the third indicator light, and the second output end of the third circuit breaker is connected to the other end of the third indicator light; the third circuit breaker is used to conduct the path between the third load and the third busbar, and the third indicator light is used to be in a first state when the path between the third load and the third busbar is conducted, and is used to be in a second state when the path between the third load and the third busbar is disconnected;

[0032] One end of the fourth indicator light is connected to the positive input end of the fourth load monitoring module, and the other end of the fourth indicator light is connected to the negative input end of the fourth load monitoring module; the first input end of the fourth circuit breaker is connected to the positive pole of the fourth bus, the second input end of the fourth circuit breaker is connected to the negative pole of the fourth bus, the first output end of the fourth circuit breaker is connected to one end of the fourth indicator light, and the second output end of the fourth circuit breaker is connected to the other end of the fourth indicator light. The fourth circuit breaker is used to conduct the path between the third load and the fourth bus, and the fourth indicator light is used to be in a first state when the path between the fourth load and the fourth bus is conducted, and is used to be in a second state when the path between the fourth load and the fourth bus is disconnected.

[0033] In one example, the circuit further includes: a first voltmeter, a second voltmeter, a third voltmeter, and a fourth voltmeter;

[0034] A first input terminal of the first voltmeter is connected to the positive electrode of the first busbar, and a second input terminal of the first voltmeter is connected to the negative electrode of the first busbar;

[0035] A first input terminal of the second voltmeter is connected to the positive electrode of the second busbar, and a second input terminal of the second voltmeter is connected to the negative electrode of the second busbar;

[0036] A first input terminal of a third voltmeter is connected to the positive electrode of the third busbar, and a second input terminal of the third voltmeter is connected to the negative electrode of the third busbar;

[0037] The first input terminal of the fourth voltmeter is connected to the positive electrode of the fourth busbar, and the second input terminal of the fourth voltmeter is connected to the negative electrode of the fourth busbar.

[0038] In one example, the circuit further includes: a power module;

[0039] The first output terminal of the power module is connected to the positive electrode of the fourth bus, and the second output terminal of the power module is connected to the negative electrode of the fourth bus.

[0040] In one example, the power module includes: a UPS, an AC circuit breaker, a rectifier, and a DC circuit breaker;

[0041] The first input terminal, the second input terminal and the third input terminal of the AC circuit breaker are connected to the UPS, the first input terminal of the rectifier is connected to the first output terminal of the AC circuit breaker, the second input terminal of the rectifier is connected to the second output terminal of the AC circuit breaker, and the third input terminal of the rectifier is connected to the third output terminal of the AC circuit breaker, so as to convert the AC power output by the UPS into DC power when the AC circuit breaker is closed;

[0042] The first input end of the DC circuit breaker is connected to the first output end of the rectifier, the second input end of the DC circuit breaker is connected to the second output end of the rectifier, the first output end of the DC circuit breaker is connected to the positive pole of the fourth bus, and the second output end of the DC circuit breaker is connected to the negative pole of the fourth bus, which is used to turn on or off the path between the DC circuit breaker and the fourth bus.

[0043] The DC system distribution switching circuit provided in the present application, the first bus and the second bus on the distribution panel are connected to the first main bus and the second main bus on the main distribution panel respectively, so as to provide power for the dual-power supply load and the dual-configuration device power supply; the path between the first bus and the third bus or the path between the first bus and the third bus is switched by the first switch switching module to provide power for the single-power supply load; the path between the first bus and the fourth bus or the path between the first bus and the fourth bus is switched by the second switch switching module to provide power for the emergency braking device; when a section of the bus connected to the main bus on the distribution panel fails, another section of the bus connected to the main bus on the distribution panel can still ensure that the dual-power supply load, the dual-configuration device power supply, the single-power supply load and the emergency braking device can provide power, so as to ensure that the dual-power supply load, the dual-configuration device power supply, the single-power supply load and the emergency braking device can all work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0045] Figure 1 An application scenario diagram of an example of the prior art;

[0046] Figure 2 A schematic diagram of the structure of a DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0047] Figure 3 A schematic diagram of the structure of another DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0048] Figure 4 A structural schematic diagram of another DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0049] Figure 5 A structural schematic diagram of another DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0050] Figure 6 A structural schematic diagram of another DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0051] Figure 7 A structural schematic diagram of another DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0052] Figure 8 A structural schematic diagram of another DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0053] Fig. 9 A structural schematic diagram of another DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0054] Fig.10 A structural schematic diagram of another DC system power distribution switching circuit provided in Embodiment 1 of the present application;

[0055] Fig.11 This is a structural schematic diagram of another DC system power distribution switching circuit provided in Example 1 of the present application.

[0056] Figure ID:

[0057] L1: first busbar;

[0058] L2: second busbar;

[0059] L3: the third busbar;

[0060] L4: fourth busbar;

[0061] K1: first main switch;

[0062] K2: second main switch;

[0063] K3: first switch;

[0064] K4: second switch;

[0065] K5: the third switch;

[0066] K6: the fourth switch;

[0067] K7: fifth switch;

[0068] K8: the sixth switch;

[0069] K9: The seventh switch;

[0070] K10: the eighth switch;

[0071] HA1: first indicator light;

[0072] HA2: second indicator light;

[0073] HA3: The third indicator light;

[0074] HA4: the fourth indicator light;

[0075] QA1: First circuit breaker;

[0076] QA2: Second circuit breaker;

[0077] QA3: The third circuit breaker;

[0078] QA4: Fourth circuit breaker;

[0079] SD1: The first normally open auxiliary node;

[0080] SD2: The second normally open auxiliary node;

[0081] SD3: The third normally open auxiliary node;

[0082] SD4: The fourth normally open auxiliary node.

[0083] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0084] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely devices and examples consistent with some aspects of the present application as detailed in the appended claims.

[0085] The DC system of a hydropower station generally adopts a layered radial power supply system, which generally includes the main powerhouse, generator floor, main transformer tunnel and auxiliary powerhouse, etc. The DC system distribution main panel is set in the main powerhouse, and the distribution sub-panels are set in the generator floor, main transformer tunnel and auxiliary powerhouse respectively. Both the distribution main panel and the distribution sub-panel are equipped with two sections of busbars. The power supply load of the unit includes dual power supply load, dual configuration device power supply, single power supply load and emergency braking device.

[0086] Figure 1 This is an application scenario diagram of an existing technology example, such as Figure 1As shown, in the current DC system of a hydropower station, the two busbars L1 and L2 on the distribution panel are respectively connected to the first main busbar and the second main busbar of the distribution main panel. When the first main switch K1 and the second main switch K2 are turned on, L1 and L2 obtain power from the two main busbars respectively; for dual-power supply loads and dual-configuration device power supplies, they are respectively connected to L1 and L2, and obtain power from L1 and L2 at the same time; for single-power supply loads and emergency brake devices, they are connected to one of the busbars of the distribution panel in a load-sharing manner. The problem with the current DC system of a hydropower station is that when a busbar of a distribution panel fails, the dual-power supply load and the dual-configuration device power supply can obtain power from the busbar that has not failed, but the single-power supply load and the emergency brake device connected to the busbar will not work, and there is a failure to exit operation, which is easy to cause an operation accident. For example, dual-power supply load A is connected to L1 and L2 on the distribution panel respectively, single-power supply load B is connected to L1 of the distribution panel, and single-power supply load C is connected to L2 of the distribution panel. If L1 fails, dual-power supply load A can obtain power from L2 and can work normally, and single-power supply load C can continue to be powered by L2 and can work normally, but single-power supply load B loses power and cannot work normally.

[0087] The DC system distribution switching circuit provided in the present application is applied to the distribution sub-panel of the layered radial power supply system. The first bus and the second bus on the distribution sub-panel are respectively connected to the first main bus and the second main bus on the distribution main panel to provide power for the dual-power supply load and the dual-configuration device power supply; the path between the first bus and the third bus or the path between the first bus and the third bus is switched by the first switch switching module to provide power for the single-power supply load; the path between the first bus and the fourth bus or the path between the first bus and the fourth bus is switched by the second switch switching module to provide power for the emergency braking device; when a section of the bus connected to the main bus on the distribution sub-panel fails, another section of the bus connected to the main bus on the distribution sub-panel can still provide power for the dual-power supply load, the dual-configuration device power supply, the single-power supply load and the emergency braking device, thereby ensuring that the dual-power supply load, the dual-configuration device power supply, the single-power supply load and the emergency braking device can all work normally.

[0088] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0089] Embodiment 1

[0090] Figure 2 A schematic diagram of a DC system power distribution switching circuit provided in the first embodiment of the present application is applied to a power distribution sub-screen of a layered radial power supply system. The layered radial power supply system includes a power distribution main screen and a power distribution sub-screen, such as Figure 2 As shown, the power distribution main panel includes a first main bus and a second main bus; the power distribution sub-panel includes: a first bus L1, a second bus L2, a third bus L3 and a fourth bus L4, a first switching switch module and a second switching switch module;

[0091] The positive pole of the first busbar L1 is connected to the positive pole of the first main busbar, and the negative pole of the first busbar L1 is connected to the negative pole of the first main busbar; the positive pole of the second busbar L2 is connected to the positive pole of the second main busbar, and the negative pole of the second busbar L2 is connected to the negative pole of the second main busbar. The first busbar L1 and the second busbar L2 are connected to the first load, and the first load is a dual-power supply load and a dual-configuration device power supply;

[0092] The first busbar L1 is connected to the first input end of the first switching switch module, the second busbar L2 is connected to the second input end of the first switching switch module, and the output end of the first switching switch module is connected to the third busbar L3; the first switching switch module is used to switch the conduction path between the first busbar L1 or the second busbar L2 and the third busbar, the third busbar L3 is connected to the second load, and the second load is a single power supply load;

[0093] The first bus L1 is connected to the first input end of the second switching switch module, the second bus L2 is connected to the second input end of the second switching switch module, and the output end of the second switching switch module is connected to the fourth bus L4; the second switching switch module is used to switch the conduction path between the first bus L1 or the second bus L2 and the fourth bus L4, the fourth bus is connected to the third load, and the third load is an emergency braking device.

[0094] In combination with the scenario example, the first bus L1 on the distribution sub-panel is connected to the first main bus on the distribution main panel, and obtains power from the first main bus. The second bus L2 on the distribution sub-panel is connected to the second main bus on the distribution main panel, and obtains power from the second main bus. The first bus L1 and the second bus L2 are both connected to the input end of the first switching switch module, and the output end of the first switching switch module is connected to the third bus. The first switching switch module can conduct the path between the first bus L1 and the third bus, or conduct the path between the second bus L2 and the third bus at the same time, so that the third bus obtains power from the first bus L1 or the second bus L2. Similarly, the first bus L1 and the second bus L2 are both connected to the input end of the second switching switch module, and the output end of the second switching switch module is connected to the fourth bus. The second switching switch module can conduct the path between the first bus L1 and the fourth bus, or conduct the path between the second bus L2 and the fourth bus at the same time, so that the fourth bus obtains electrical energy from the first bus L1 or the second bus L2.

[0095] For example, assuming that the first load is load A, load A can be connected to the first bus L1 and the second bus L2 respectively, and load A is provided with electric energy by the first bus L1 or the second bus L2. The second load is load B and load C in the example, load B and load C can be connected to the third bus, and electric energy is provided to load B and load C through the third bus. The third load is load D in the example, load D can be connected to the fourth bus, and electric energy is provided to load D through the fourth bus. Through the DC system power distribution switching circuit provided in this example, when a fault occurs in the first bus L1 or the second bus L2, for example, when a fault occurs in the first bus L1, electric energy can be provided to load A through the second bus L2, and at the same time, the first switching switch can conduct the path between the second bus L2 and the third bus, and the second switching switch can conduct the path between the fourth bus and the third bus, so that there is still electric energy in the third bus and the fourth bus, and electric energy can still be provided to loads B, C and D, thereby ensuring that dual-power supply loads, dual-configuration device power supplies, single-power supply loads and emergency braking devices can all operate normally.

[0096] Optional, Figure 3 This is a structural diagram of another DC system power distribution switching circuit provided in Embodiment 1 of the present application, such as Figure 3 As shown, the first switch module includes: a first switch K3, a second switch K4, a third switch K5 and a fourth switch K6;

[0097] One end of the first switch K3 is connected to the positive electrode of the first busbar L1, and the other end of the first switch K3 is connected to the positive electrode of the third busbar L3;

[0098] One end of the second switch K4 is connected to the negative electrode of the first busbar L1, and the other end of the second switch K4 is connected to the negative electrode of the third busbar L3;

[0099] One end of the third switch K5 is connected to the positive electrode of the second busbar L2, and the other end of the third switch K5 is connected to the positive electrode of the third busbar L3;

[0100] One end of the fourth switch K6 is connected to the negative electrode of the second busbar L2 , and the other end of the fourth switch K6 is connected to the negative electrode of the third busbar L3 .

[0101] In combination with the scenario example, the first switch K3 and the second switch K4 are closed at the same time. When the first switch K3 and the second switch K4 are closed, the path between the first bus L1 and the third bus L3 is conductive. The third switch K5 and the fourth switch K6 are closed at the same time. When the third switch K5 and the fourth switch K6 are closed, the path between the second bus L1 and the third bus L3 is conductive. Based on the DC system power distribution switching circuit provided in this example, when the first switch K3 and the second switch K4 are closed, the first bus L1 can provide electric energy to the third bus L3, and when the third switch K5 and the fourth switch K6 are closed, the second bus L2 can provide electric energy to the third bus L3.

[0102] Optional, Figure 4 A structural diagram of another DC system power distribution switching circuit provided in the first embodiment of the present application is shown in FIG. Figure 4 As shown, the second switch module includes: a fifth switch K7, a sixth switch K8, a seventh switch K9 and an eighth switch K10;

[0103] One end of the fifth switch K7 is connected to the positive electrode of the first busbar, and the other end of the fifth switch K7 is connected to the positive electrode of the fourth busbar;

[0104] One end of the sixth switch K8 is connected to the negative electrode of the first bus, and the other end of the sixth switch K8 is connected to the negative electrode of the fourth bus;

[0105] One end of the seventh switch K9 is connected to the positive electrode of the second busbar, and the other end of the seventh switch K9 is connected to the positive electrode of the fourth busbar;

[0106] One end of the eighth switch K10 is connected to the negative electrode of the second bus, and the other end of the eighth switch K10 is connected to the negative electrode of the fourth bus.

[0107] In combination with the scenario example, the fifth switch K7 and the sixth switch K8 are closed at the same time. When the fifth switch K7 and the sixth switch K8 are closed, the path between the first bus L1 and the fourth bus L4 is conductive. The seventh switch K9 and the eighth switch K10 are closed at the same time. When the seventh switch K9 and the eighth switch K10 are closed, the path between the second bus L1 and the fourth bus L4 is conductive. Based on the DC system power distribution switching circuit provided in this example, when the fifth switch K7 and the sixth switch K8 are closed, the first bus L1 can provide electric energy to the fourth bus L4, and when the seventh switch K9 and the eighth switch K10 are closed, the second bus L2 can provide electric energy to the fourth bus L4.

[0108] Optional, Figure 5 A structural diagram of another DC system power distribution switching circuit provided in the first embodiment of the present application is shown in FIG. Figure 5 As shown, the first switch module further includes: a first interlocking device D1;

[0109] One end of the first interlocking device D1 is connected to the first switch K3 and the second switch K4 respectively, and the other end of the first interlocking device D1 is connected to the third switch K5 and the fourth switch K6 respectively. The first interlocking device D1 is used to close the first switch K3 and the second switch K4, or to close the third switch K5 and the fourth switch K6.

[0110] In combination with the scenario example, the first switch K3 and the second switch K4 can be used as a group of switches, and the third switch K5 and the fourth switch K6 can be used as another group of switches. If there is no fault in the first bus L1 and the second bus L2, the first interlocking device D1 can control the closing of any one of the groups of switches. If there is a fault in the first bus L1 or the second bus L2, the first interlocking device D1 can control the closing of the group of switches corresponding to the non-faulty bus. For example, if there is a fault in the first bus L1, the first interlocking device D1 can close the third switch K5 and the fourth switch K6 to conduct the path between the third bus L3 and the second bus L2, so that the third bus L3 can still obtain electrical energy from the second bus L2.

[0111] Optional, Figure 6 A structural diagram of another DC system power distribution switching circuit provided in the first embodiment of the present application is shown in FIG. Figure 6 As shown, the second switching switch module further includes: a second interlocking device D2;

[0112] One end of the second interlocking device D2 is connected to the fifth switch K7 and the sixth switch K8 respectively, and the other end of the second interlocking device is connected to the seventh switch K9 and the eighth switch K10 respectively. The second interlocking device D2 is used to close the fifth switch K7 and the sixth switch K8, or to close the seventh switch K9 and the eighth switch K10.

[0113] In combination with the scenario example, the fifth switch K7 and the sixth switch K8 can be used as a group of switches, and the seventh switch K9 and the eighth switch K10 can be used as another group of switches. If there is no fault in the first bus L1 and the second bus L2, the second interlocking device D2 can control the closing of any one of the groups of switches. If there is a fault in the first bus L1 or the second bus L2, the second interlocking device D2 can control the closing of the group of switches corresponding to the non-faulty bus. For example, if there is a fault in the first bus L1, the second interlocking device D2 can conduct the path between the fourth bus L4 and the second bus L2 by closing the seventh switch K9 and the eighth switch K10, so that the fourth bus L4 can still obtain electrical energy from the second bus L2.

[0114] Optional, Figure 7 A structural diagram of another DC system power distribution switching circuit provided in the first embodiment of the present application is shown in FIG. Figure 7 As shown, the circuit further includes: at least one first load monitoring module, at least one second load monitoring module, at least one third load monitoring module and at least one fourth load monitoring module;

[0115] The positive input terminal of the first load monitoring module is connected to the positive pole of the first bus, the negative input terminal of the first load monitoring module is connected to the negative pole of the first bus, and the output terminal of the first load monitoring module is connected to the first load;

[0116] The positive input terminal of the second load monitoring module is connected to the positive pole of the second bus, the negative input terminal of the second load monitoring module is connected to the negative pole of the second bus, and the output terminal of the second load monitoring module is connected to the first load;

[0117] The positive input terminal of the third load monitoring module is connected to the positive pole of the third bus, the negative input terminal of the third load monitoring module is connected to the negative pole of the third bus, and the output terminal of the third load monitoring module is connected to the second load;

[0118] The positive input terminal of the fourth load monitoring module is connected to the positive pole of the fourth bus, the negative input terminal of the fourth load monitoring module is connected to the negative pole of the fourth bus, and the output terminal of the fourth load monitoring module is connected to the third load.

[0119] In combination with the scenario example, the number of the first load detection modules and the number of the second load detection modules are equal to the number of dual-power supply loads, and each first load detection module and each second load detection module are connected to a dual-power supply load. Figure 7The load A in the example is a load powered by dual power supplies. The first load detection module and the second load detection module are both connected to load A and can simultaneously detect the operation of load A. The number of the third load monitoring modules is equal to the number of the loads powered by a single power supply. Each third load monitoring module is connected to a load powered by a single power supply and is used to detect the operation of the connected load powered by a single power supply. Figure 7 The loads B and C in the example are single-power-supply loads, so Figure 7 The two third load detection modules in the example are respectively connected to one of the loads powered by a single power supply. The number of the fourth load detection modules is equal to the number of emergency brake devices. Each fourth load monitoring module is connected to an emergency brake device to detect the operating conditions of the connected emergency brake device. Figure 7 The load D in the example is an emergency braking device, and the fourth load monitoring module is connected to the load D.

[0120] Optional, Figure 8 A structural diagram of another DC system power distribution switching circuit provided in the first embodiment of the present application is shown in FIG. Figure 8 As shown, the first load monitoring module includes: a first indicator light HA1 and a first circuit breaker QA1, the second load monitoring module includes: a second indicator light HA2 and a second circuit breaker QA2, the third load monitoring module includes: a third indicator light HA3 and a third circuit breaker QA3, and the fourth load monitoring module includes: a fourth indicator light HA4 and a fourth circuit breaker QA4;

[0121] One end of the first indicator light HA1 is connected to the positive input end of the first load monitoring module, and the other end of the first indicator light HA1 is connected to the negative input end of the first load monitoring module; the first input end of the first circuit breaker QA1 is connected to the positive pole of the first busbar L1, the second input end of the first circuit breaker QA1 is connected to the negative pole of the first busbar L1, the first output end of the first circuit breaker QA1 is connected to one end of the first indicator light HA1, and the second output end of the first circuit breaker QA1 is connected to the other end of the first indicator light HA1. The first circuit breaker QA1 is used to conduct the path between the first load and the first busbar L1. The first indicator light HA1 is used to be in a first state when the path between the first load and the first busbar L1 is conducted, and is used to be in a second state when the path between the first load and the first busbar L1 is disconnected;

[0122] One end of the second indicator light HA2 is connected to the positive input end of the second load monitoring module, and the other end of the second indicator light HA2 is connected to the negative input end of the second load monitoring module; the first input end of the second circuit breaker QA2 is connected to the positive pole of the second busbar L2, the second input end of the second circuit breaker QA2 is connected to the negative pole of the second busbar L2, the first output end of the second circuit breaker QA2 is connected to one end of the second indicator light HA2, and the second output end of the second circuit breaker QA2 is connected to the other end of the second indicator light HA2. The second circuit breaker QA2 is used to conduct the path between the second load and the second busbar L2. The second indicator light HA2 is used to be in a first state when the path between the second load and the second busbar L2 is conducted, and is used to be in a second state when the path between the second load and the second busbar L2 is disconnected;

[0123] One end of the third indicator light HA3 is connected to the positive input end of the third load monitoring module, and the other end of the third indicator light HA3 is connected to the negative input end of the third load monitoring module; the first input end of the third circuit breaker QA3 is connected to the positive pole of the third busbar L3, the second input end of the third circuit breaker QA3 is connected to the negative pole of the third busbar L3, the first output end of the third circuit breaker QA3 is connected to one end of the third indicator light HA3, the second output end of the third circuit breaker QA3 is connected to the other end of the third indicator light HA3, the third circuit breaker QA3 is used to conduct the path between the third load and the third busbar L3, the third indicator light HA3 is used to be in a first state when the path between the third load and the third busbar is conducted, and is used to be in a second state when the path between the third load and the third busbar L3 is disconnected;

[0124] One end of the fourth indicator light HA4 is connected to the positive input end of the fourth load monitoring module, and the other end of the fourth indicator light HA4 is connected to the negative input end of the fourth load monitoring module; the first input end of the fourth circuit breaker QA4 is connected to the positive pole of the fourth bus L4, the second input end of the fourth circuit breaker QA4 is connected to the negative pole of the fourth bus L4, the first output end of the fourth circuit breaker QA4 is connected to one end of the fourth indicator light HA4, and the second output end of the fourth circuit breaker QA4 is connected to the other end of the fourth indicator light HA4. The fourth circuit breaker QA4 is used to conduct the path between the third load and the fourth bus L4. The fourth indicator light HA4 is used to be in a first state when the path between the fourth load and the fourth bus L4 is conducted, and is used to be in a second state when the path between the fourth load and the fourth bus L4 is disconnected.

[0125] Combined with the scenario example, each load monitoring module includes an indicator light and a circuit breaker. The circuit breaker is used to conduct or disconnect the path between the connected load and the bus. When the circuit breaker is closed, the path between the load and the bus is conducted, and when the circuit breaker is disconnected, the path between the load and the bus is disconnected. The indicator light is used to prompt whether the path between the load connected to the load monitoring module and the bus is conducted, that is, whether the bus supplies power to the load normally. Each circuit breaker includes a circuit breaker normally open auxiliary node. For example, the first circuit breaker QA1 includes a first normally open auxiliary node SD1, the second circuit breaker QA2 includes a second normally open auxiliary node SD2, the third circuit breaker QA3 includes a third normally open auxiliary node SD3, and the fourth circuit breaker QA4 includes a first normally open auxiliary node SD4. For example, taking the first load monitoring module and load A as an example, when the first indicator light is on, it can be determined that the path between load A and the first bus is in a conducting state, and when the first indicator light is off, it can be determined that the path between load A and the first bus is in a disconnected state.

[0126] Optional, Fig. 9 A structural diagram of another DC system power distribution switching circuit provided in the first embodiment of the present application is shown in FIG. Fig. 9 As shown, the circuit further includes: a first voltmeter PV1, a second voltmeter PV2, a third voltmeter PV3 and a fourth voltmeter PV4;

[0127] A first input terminal of the first voltmeter PV1 is connected to the positive electrode of the first busbar L1, and a second input terminal of the first voltmeter PV1 is connected to the negative electrode of the first busbar L2;

[0128] A first input terminal of the second voltmeter PV2 is connected to the positive electrode of the second busbar L2, and a second input terminal of the second voltmeter PV2 is connected to the negative electrode of the second busbar L2;

[0129] A first input terminal of the third voltmeter PV3 is connected to the positive electrode of the third busbar L3, and a second input terminal of the third voltmeter PV3 is connected to the negative electrode of the third busbar L3;

[0130] A first input terminal of the fourth voltmeter PV4 is connected to the positive electrode of the fourth busbar L4, and a second input terminal of the fourth voltmeter PV4 is connected to the negative electrode of the fourth busbar L4.

[0131] In combination with the scenario example, the first voltmeter PV1 is used to measure the voltage on the first bus L1. Similarly, the second voltmeter PV2 is used to measure the voltage on the second bus L2. The third voltmeter PV3 is used to measure the voltage on the third bus L3. The fourth voltmeter PV4 is used to measure the voltage on the fourth bus L4.

[0132] Optional, Fig.10 A structural diagram of another DC system power distribution switching circuit provided in the first embodiment of the present application is shown in FIG. Fig.10As shown, the circuit also includes: a power supply module;

[0133] The first output terminal of the power module is connected to the positive electrode of the fourth bus, and the second output terminal of the power module is connected to the negative electrode of the fourth bus.

[0134] Combined with the scenario example, since the fourth bus is connected to an emergency braking device, another power module can be provided for the fourth bus. When both the first bus and the second bus fail, the power module can provide power to the fourth bus to avoid the accidental failure of the emergency braking device to work.

[0135] Optional, Fig.11 A structural diagram of another DC system power distribution switching circuit provided in the first embodiment of the present application is shown in FIG. Fig.11 As shown, the power module includes: UPS, AC circuit breaker, rectifier and DC circuit breaker;

[0136] The first input terminal, the second input terminal and the third input terminal of the AC circuit breaker are connected to the UPS, the first input terminal of the rectifier is connected to the first output terminal of the AC circuit breaker, the second input terminal of the rectifier is connected to the second output terminal of the AC circuit breaker, and the third input terminal of the rectifier is connected to the third output terminal of the AC circuit breaker, so as to convert the AC power output by the UPS into DC power when the AC circuit breaker is closed;

[0137] The first input end of the DC circuit breaker is connected to the first output end of the rectifier, the second input end of the DC circuit breaker is connected to the second output end of the rectifier, the first output end of the DC circuit breaker is connected to the positive pole of the fourth bus, and the second output end of the DC circuit breaker is connected to the negative pole of the fourth bus, which is used to turn on or off the path between the DC circuit breaker and the fourth bus.

[0138] Combined with the scenario example, the uninterruptible power supply (UPS) provided in this example can provide 380V AC power, which can be converted into 220V DC power after the rectifier. The AC circuit breaker QFJ is used to control the conduction and disconnection of the path between the UPS and the rectifier, and the DC circuit breaker QFD is used to control the conduction and disconnection of the path between the rectifier and the fourth bus. When the fourth bus loses power, the DC circuit breaker and the AC circuit breaker are both closed, and the 380V AC power provided by the UPS is converted into 220V DC power through the rectifier, and then the DC power is transmitted to the fourth bus to provide power for the fourth bus.

[0139] The present application switches the path between the first bus and the third bus or the path between the first bus and the third bus through the first switch switching module to provide power for the single-power supply load; switches the path between the first bus and the fourth bus or the path between the first bus and the fourth bus through the second switch switching module to provide power for the emergency braking device; when a section of the bus connected to the main bus on the distribution panel fails, another section of the bus connected to the main bus on the distribution panel can still provide power for the dual-power supply load, the dual-configuration device power supply, the single-power supply load and the emergency braking device, thereby ensuring that the dual-power supply load, the dual-configuration device power supply, the single-power supply load and the emergency braking device can all work normally.

[0140] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0142] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A DC system power distribution switching circuit, applied to the power distribution sub-screen of a layered radial power supply system, characterized in that: The layered radial power supply system includes a main distribution panel and a sub-distribution panel, wherein the main distribution panel includes a first main bus and a second main bus; the sub-distribution panel includes: a first bus, a second bus, a third bus and a fourth bus, a first switching switch module and a second switching switch module; The positive electrode of the first bus is connected to the positive electrode of the first main bus, and the negative electrode of the first bus is connected to the negative electrode of the first main bus; the positive electrode of the second bus is connected to the positive electrode of the second main bus, and the negative electrode of the second bus is connected to the negative electrode of the second main bus; the first bus and the second bus are connected to a first load, and the first load is a dual-power supply load and a dual-configuration device power supply; The first bus is connected to the first input end of the first switching switch module, the second bus is connected to the second input end of the first switching switch module, and the output end of the first switching switch module is connected to the third bus; the first switching switch module is used to switch the conduction path between the first bus or the second bus and the third bus, the third bus is connected to the second load, and the second load is a single power supply load; The first bus is connected to the first input end of the second switching switch module, the second bus is connected to the second input end of the second switching switch module, and the output end of the second switching switch module is connected to the fourth bus; the second switching switch module is used to switch the conduction path between the first bus or the second bus and the fourth bus, the fourth bus is connected to the third load, and the third load is an emergency braking device.

2. The circuit according to claim 1, characterized in that The first switch module includes: a first switch, a second switch, a third switch and a fourth switch; One end of the first switch is connected to the positive electrode of the first bus, and the other end of the first switch is connected to the positive electrode of the third bus; One end of the second switch is connected to the negative electrode of the first bus, and the other end of the second switch is connected to the negative electrode of the third bus; One end of the third switch is connected to the positive electrode of the second busbar, and the other end of the third switch is connected to the positive electrode of the third busbar; One end of the fourth switch is connected to the negative electrode of the second bus, and the other end of the fourth switch is connected to the negative electrode of the third bus.

3. The circuit according to claim 2, characterized in that The second switch module includes: a fifth switch, a sixth switch, a seventh switch and an eighth switch; One end of the fifth switch is connected to the positive electrode of the first busbar, and the other end of the fifth switch is connected to the positive electrode of the fourth busbar; One end of the sixth switch is connected to the negative electrode of the first bus, and the other end of the sixth switch is connected to the negative electrode of the fourth bus; One end of the seventh switch is connected to the positive electrode of the second bus, and the other end of the seventh switch is connected to the positive electrode of the fourth bus; One end of the eighth switch is connected to the negative electrode of the second bus, and the other end of the eighth switch is connected to the negative electrode of the fourth bus.

4. The circuit according to claim 3, characterized in that The first switching switch module further includes: a first interlocking device; One end of the first interlocking device is connected to the first switch and the second switch respectively, and the other end of the first interlocking device is connected to the third switch and the fourth switch respectively. The first interlocking device is used to close the first switch and the second switch, or to close the third switch and the fourth switch.

5. The circuit according to claim 4, characterized in that The second switching switch module further includes: a second interlocking device; One end of the second interlocking device is connected to the fifth switch and the sixth switch respectively, and the other end of the second interlocking device is connected to the seventh switch and the eighth switch respectively. The second interlocking device is used to close the fifth switch and the sixth switch, or to close the seventh switch and the eighth switch.

6. The circuit according to claim 5, characterized in that The circuit further comprises: at least one first load monitoring module, at least one second load monitoring module, at least one third load monitoring module and at least one fourth load monitoring module; The positive input terminal of the first load monitoring module is connected to the positive pole of the first bus, the negative input terminal of the first load monitoring module is connected to the negative pole of the first bus, and the output terminal of the first load monitoring module is connected to the first load; The positive input terminal of the second load monitoring module is connected to the positive pole of the second bus, the negative input terminal of the second load monitoring module is connected to the negative pole of the second bus, and the output terminal of the second load monitoring module is connected to the first load; The positive input terminal of the third load monitoring module is connected to the positive pole of the third bus, the negative input terminal of the third load monitoring module is connected to the negative pole of the third bus, and the output terminal of the third load monitoring module is connected to the second load; The positive input terminal of the fourth load monitoring module is connected to the positive pole of the fourth bus, the negative input terminal of the fourth load monitoring module is connected to the negative pole of the fourth bus, and the output terminal of the fourth load monitoring module is connected to the third load.

7. The circuit according to claim 6, characterized in that The first load monitoring module includes: a first indicator light and a first circuit breaker, the second load monitoring module includes: a second indicator light and a second circuit breaker, the third load monitoring module includes: a third indicator light and a third circuit breaker, and the fourth load monitoring module includes: a fourth indicator light and a fourth circuit breaker; One end of the first indicator light is connected to the positive input end of the first load monitoring module, and the other end of the first indicator light is connected to the negative input end of the first load monitoring module; the first input end of the first circuit breaker is connected to the positive pole of the first bus, the second input end of the first circuit breaker is connected to the negative pole of the first bus, the first output end of the first circuit breaker is connected to one end of the first indicator light, and the second output end of the first circuit breaker is connected to the other end of the first indicator light, the first circuit breaker is used to conduct the path between the first load and the first bus, the first indicator light is used to be in a first state when the path between the first load and the first bus is conducted, and is used to be in a second state when the path between the first load and the first bus is disconnected; One end of the second indicator light is connected to the positive input end of the second load monitoring module, and the other end of the second indicator light is connected to the negative input end of the second load monitoring module; the first input end of the second circuit breaker is connected to the positive pole of the second bus, the second input end of the second circuit breaker is connected to the negative pole of the second bus, the first output end of the second circuit breaker is connected to one end of the second indicator light, and the second output end of the second circuit breaker is connected to the other end of the second indicator light, the second circuit breaker is used to conduct the path between the second load and the second bus, the second indicator light is used to be in a first state when the path between the second load and the second bus is conducted, and is used to be in a second state when the path between the second load and the second bus is disconnected; One end of the third indicator light is connected to the positive input end of the third load monitoring module, and the other end of the third indicator light is connected to the negative input end of the third load monitoring module; the first input end of the third circuit breaker is connected to the positive pole of the third bus, the second input end of the third circuit breaker is connected to the negative pole of the third bus, the first output end of the third circuit breaker is connected to one end of the third indicator light, and the second output end of the third circuit breaker is connected to the other end of the third indicator light; the third circuit breaker is used to conduct the path between the third load and the third bus, and the third indicator light is used to be in a first state when the path between the third load and the third bus is conducted, and is used to be in a second state when the path between the third load and the third bus is disconnected; One end of the fourth indicator light is connected to the positive input end of the fourth load monitoring module, and the other end of the fourth indicator light is connected to the negative input end of the fourth load monitoring module; the first input end of the fourth circuit breaker is connected to the positive pole of the fourth bus, the second input end of the fourth circuit breaker is connected to the negative pole of the fourth bus, the first output end of the fourth circuit breaker is connected to one end of the fourth indicator light, and the second output end of the fourth circuit breaker is connected to the other end of the fourth indicator light; the fourth circuit breaker is used to conduct the path between the third load and the fourth bus, and the fourth indicator light is used to be in a first state when the path between the fourth load and the fourth bus is conducted, and is used to be in a second state when the path between the fourth load and the fourth bus is disconnected.

8. The circuit according to claim 7, characterized in that The circuit further comprises: a first voltmeter, a second voltmeter, a third voltmeter and a fourth voltmeter; The first input terminal of the first voltmeter is connected to the positive electrode of the first busbar, and the second input terminal of the first voltmeter is connected to the negative electrode of the first busbar; The first input terminal of the second voltmeter is connected to the positive electrode of the second bus, and the second input terminal of the second voltmeter is connected to the negative electrode of the second bus; The first input terminal of the third voltmeter is connected to the positive electrode of the third busbar, and the second input terminal of the third voltmeter is connected to the negative electrode of the third busbar; The first input terminal of the fourth voltmeter is connected to the positive electrode of the fourth bus, and the second input terminal of the fourth voltmeter is connected to the negative electrode of the fourth bus.

9. The circuit according to claim 8, characterized in that The circuit further comprises: a power supply module; The first output end of the power module is connected to the positive electrode of the fourth bus, and the second output end of the power module is connected to the negative electrode of the fourth bus.

10. The circuit according to claim 9, characterized in that The power supply module includes: UPS, AC circuit breaker, rectifier and DC circuit breaker; The first input terminal, the second input terminal and the third input terminal of the AC circuit breaker are connected to the UPS, the first input terminal of the rectifier is connected to the first output terminal of the AC circuit breaker, the second input terminal of the rectifier is connected to the second output terminal of the AC circuit breaker, and the third input terminal of the rectifier is connected to the third output terminal of the AC circuit breaker, and is used to convert the AC power output by the UPS into DC power when the AC circuit breaker is closed; The first input end of the DC circuit breaker is connected to the first output end of the rectifier, the second input end of the DC circuit breaker is connected to the second output end of the rectifier, the first output end of the DC circuit breaker is connected to the positive pole of the fourth bus, and the second output end of the DC circuit breaker is connected to the negative pole of the fourth bus, for connecting or disconnecting the path between the DC circuit breaker and the fourth bus.

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