Power supply device of ring main unit

Abstract

The utility model discloses a power supply device of a ring main unit, and relates to the field of power transmission and distribution in the power industry, the power supply device comprises a rectification circuit, a first filter circuit and a second filter circuit, and a first input terminal and a second input terminal of the rectification circuit are external power supply connecting ends; a first output terminal of the rectifying circuit is connected with a first input terminal of the first filter circuit and a first input terminal of the second filter circuit, and a second output terminal of the rectifying circuit is connected with a second input terminal of the first filter circuit and a second input terminal of the second filter circuit; a first output terminal of the first filter circuit is connected with a first power supply end through a first switch, and a second output terminal is connected with a second power supply end through a second switch; a first output terminal of the second filter circuit is connected with the first power supply end through a third switch, and a second output terminal is connected with the second power supply end through a fourth switch. The rectification circuit and the filter circuit are arranged, stable direct current is provided for the ring main unit, and the influence on the ring main unit or other parts of equipment is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power transmission and distribution in the electric power industry, and in particular to a power supply device for a ring main unit. Background Art

[0002] Cable branch boxes are widely used in power systems for power transmission and distribution. They transfer electricity from the high-voltage grid to the low-voltage grid, distributing it according to varying load demands and distributing it to various user facilities through the distribution system. Cable branch boxes can be installed with ring main units (RMUs), high-voltage switchgear that distribute and protect electrical energy. Before the cable branch box is put into operation, it is necessary to perform transmission commissioning to ensure its normal operation.

[0003] When the cable branch box is being tested or used, an external power source (such as a generator truck or uninterruptible power supply system) is connected to the ring main unit (RMU). Parameters such as the voltage of this external power source are often unstable, which can lead to commissioning errors and even damage the RMU or other equipment in the cable branch box. Utility Model Content

[0004] In view of the above problems, the present application provides a power supply device for a ring main unit (RMU) to achieve the purpose of reducing the impact on the RMU or other equipment in the cable branch box during power supply. The specific solution is as follows:

[0005] A first aspect of the present application provides a power supply device for a ring main unit, the power supply device for the ring main unit comprising a rectifier circuit, a first filter circuit and a second filter circuit.

[0006] The first input terminal and the second input terminal of the rectifier circuit are external power supply connection terminals;

[0007] The first output terminal of the rectifier circuit is connected to the first input terminal of the first filter circuit, and the second output terminal of the rectifier circuit is connected to the second input terminal of the first filter circuit;

[0008] The first output terminal of the rectifier circuit is connected to the first input terminal of the second filter circuit, and the second output terminal of the rectifier circuit is connected to the second input terminal of the second filter circuit;

[0009] The first output terminal of the first filter circuit is connected to a first power supply end for supplying power to the ring main unit through a first switch, and the second output terminal of the first filter circuit is connected to a second power supply end for supplying power to the ring main unit through a second switch;

[0010] The first output terminal of the second filter circuit is connected to the first power supply terminal through a third switch, and the second output terminal of the second filter circuit is connected to the second power supply terminal through a fourth switch.

[0011] In a possible implementation, the power supply device of the ring main unit further includes a battery pack;

[0012] The third output terminal of the rectifier circuit is connected to the first input terminal of the battery pack, and the fourth output terminal of the rectifier circuit is connected to the second input terminal of the battery pack;

[0013] The first output terminal of the battery pack is connected to the third input terminal of the first filter circuit, and the second output terminal of the battery pack is connected to the fourth input terminal of the first filter circuit;

[0014] The first output terminal of the battery pack is connected to the third input terminal of the second filter circuit, and the second output terminal of the battery pack is connected to the fourth input terminal of the second filter circuit.

[0015] In a possible implementation, the power supply device of the ring main unit further includes a fifth switch and a sixth switch;

[0016] The first input terminal of the rectifier circuit is connected to the first output terminal of the external power supply through the fifth switch, and the second input terminal of the rectifier circuit is connected to the second output terminal of the external power supply through the sixth switch.

[0017] In a possible implementation, the rectifier circuit includes an AC / DC circuit and a DC / DC circuit,

[0018] The first input terminal and the second input terminal of the AC / DC circuit are external power supply connection terminals, and the first input terminal and the second input terminal of the DC / DC circuit are external power supply connection terminals;

[0019] The first output terminal of the AC / DC circuit is connected to the first input terminal of the first filter circuit, and the second output terminal of the AC / DC circuit is connected to the second input terminal of the first filter circuit;

[0020] The first output terminal of the DC / DC circuit is connected to the first input terminal of the first filter circuit, and the second output terminal of the DC / DC circuit is connected to the second input terminal of the first filter circuit;

[0021] The first output terminal of the AC / DC circuit is connected to the first input terminal of the second filter circuit, and the second output terminal of the AC / DC circuit is connected to the second input terminal of the second filter circuit;

[0022] The first output terminal of the DC / DC circuit is connected to the first input terminal of the second filter circuit, and the second output terminal of the DC / DC circuit is connected to the second input terminal of the second filter circuit.

[0023] In a possible implementation, the power supply device of the ring main unit further includes a first power indicator lamp,

[0024] Both ends of the first power indicator lamp are respectively connected to the first input terminal and the second input terminal of the rectifier circuit.

[0025] In a possible implementation, the power supply device of the ring main unit further includes a second power indicator lamp,

[0026] Both ends of the second power indicator lamp are respectively connected to the first power supply terminal and the second power supply terminal.

[0027] In a possible implementation, it further includes: a socket for connecting an external power supply, a first terminal of the socket is electrically connected to the first input terminal of the rectifier circuit through the fifth switch, and a second terminal of the socket is electrically connected to the second input terminal of the rectifier circuit through the sixth switch.

[0028] In a possible implementation, the third input terminal of the first filter circuit is connected to the third input terminal of the second filter circuit, and the third output terminal of the first filter circuit is connected to the third output terminal of the second filter circuit.

[0029] In a possible implementation, the power supply device of the ring main unit further includes a box body,

[0030] The rectifier circuit, the first filter circuit, the second filter circuit and the battery pack are all arranged in the box body;

[0031] The box body is arranged on one side of the ring main unit.

[0032] In a possible implementation, it further includes an intelligent monitoring device, and a monitoring parameter output interface is arranged on the power supply device of the ring main unit;

[0033] The intelligent monitoring device is connected to the monitoring parameter output interface.

[0034] With the above technical solution, a power supply device for a ring main unit provided by the present application can provide stable direct current to the ring main unit in the cable distribution box through a rectifier circuit and a filter circuit. Since the stability of direct current is higher than that of alternating current, the rectifier circuit can improve the stability of the external power supply, and further, the filter circuit can also eliminate the fluctuations of the external power supply caused by environmental factors as much as possible. Therefore, this device can effectively reduce the impact on the ring main unit or other partial devices in the cable distribution box. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In combination with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic and that the elements and elements are not necessarily drawn to scale.

[0036] Figure 1 FIG. [FIG. NUMBER] is a schematic structural diagram of a power supply device for a ring main unit provided by an embodiment of the present application;

[0037] Figure 2 FIG. [FIG. NUMBER] is a schematic connection diagram of a battery pack provided by an embodiment of the present application;

[0038] Figure 3 FIG. [FIG. NUMBER] is a schematic connection diagram of a first power indicator and a second power indicator provided by an embodiment of the present application;

[0039] Figure 4 FIG. [FIG. NUMBER] is a schematic diagram of the placement position of a power supply device for a ring main unit in a cable distribution box provided by an embodiment of the present application.

[0040] Reference Numerals:

[0041] Note: The "FIG. [FIG. NUMBER]" in the translation is a placeholder. You need to fill in the actual figure number according to the specific content of the original text.1 - Rectifier circuit; 2 - First filter circuit; 3 - Second filter circuit; 4 - First input terminal of the rectifier circuit; 5 - Second input terminal of the rectifier circuit; 6 - First output terminal of the rectifier circuit; 7 - Second output terminal of the rectifier circuit; 8 - First input terminal of the first filter circuit; 9 - Second input terminal of the first filter circuit; 10 - First input terminal of the second filter circuit; 11 - Second input terminal of the second filter circuit; 12 - First output terminal of the first filter circuit; 13 - Second output terminal of the first filter circuit; 14 - First switch; 15 - Second switch; 16 - First power supply terminal; 17 - Second power supply terminal; 18 - First output terminal of the second filter circuit; 19 - Second output terminal of the second filter circuit; 20 - Third switch; 21 - Fourth switch; 22 - Battery pack; 23 - Third output terminal of the rectifier circuit; 24 - Fourth output terminal of the rectifier circuit; 25 - First input terminal of the battery pack; 26 - Second input terminal of the battery pack; 27 - First output terminal of the battery pack; 28 - Second output terminal of the battery pack; 29 - Third input terminal of the first filter circuit; 30 - Fourth input terminal of the first filter circuit; 31 - Third input terminal of the second filter circuit; 32 - Fourth input terminal of the second filter circuit; 33 - First power indicator; 34 - Second power indicator; 35 - Box body. Detailed implementation manners

[0042] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. The terms used in the embodiments of the present application are only for explaining the specific embodiments of the present application, rather than aiming to limit the present application.

[0043] The embodiments of the present application will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0044] The terms "first", "second", etc. in the specification of the present application and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing when describing objects with the same attributes in the embodiments of the present application. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device including a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these processes, methods, products or devices.

[0045] The 35KV cable distribution box is a power transmission and distribution device widely used in the power system. It can transmit electricity from the high-voltage power grid to the low-voltage power grid, distribute it according to different load demands, and distribute it to each user facility through the distribution system. A ring main unit can be set in the 35KV cable distribution box. The ring main unit is a high-voltage switchgear that realizes the distribution and protection of electric energy. Before the 35KV cable distribution box starts to be used intelligently, it is necessary to conduct a drive commissioning on the 35KV cable distribution box to ensure its normal operation.

[0046] When the 35KV cable distribution box is being tested or used, an external power supply (such as an external power generation vehicle or an uninterruptible power supply system) is connected to supply power to the ring main unit. The voltage and other parameters of the external power supply are often unstable, which can lead to deviation in commissioning and even damage to the ring main unit or other partial equipment in the 35KV cable distribution box. And the power supply control circuit of the ring main unit in the 35KV cable distribution box requires direct current, so a relatively stable direct current power supply system needs to be provided.

[0047] To solve the above problems, the embodiment of the present application provides a power supply device for a ring main unit. The power supply device for the ring main unit in the embodiment of the present application will be introduced in detail below with reference to the accompanying drawings.

[0048] Refer to Figure 1 , Figure 1 which is a schematic structural diagram of a power supply device for a ring main unit provided by the embodiment of the present application. As Figure 1 shown, the power supply device for a ring main unit provided by the embodiment of the present application includes a rectification circuit 1, a first filter circuit 2, and a second filter circuit 3.

[0049] The first input terminal 4 and the second input terminal 5 of the rectification circuit 1 are external power supply connection terminals;

[0050] The first output terminal 6 of the rectification circuit 1 is connected to the first input terminal 8 of the first filter circuit 2, and the second output terminal 7 of the rectification circuit 1 is connected to the second input terminal 9 of the first filter circuit 2;

[0051] The first output terminal 6 of the rectification circuit 1 is connected to the first input terminal 10 of the second filter circuit 3, and the second output terminal 7 of the rectification circuit 1 is connected to the second input terminal 11 of the second filter circuit 3;

[0052] The first output terminal 12 of the first filter circuit 2 is connected to the first power supply terminal 16 for supplying power to the ring main unit through the first switch 14, and the second output terminal 13 of the first filter circuit 2 is connected to the second power supply terminal 17 for supplying power to the ring main unit through the second switch 15;

[0053] The first output terminal 18 of the second filter circuit 3 is connected to the first power supply terminal 16 through the third switch 20, and the second output terminal 19 of the second filter circuit 3 is connected to the second power supply terminal 17 through the fourth switch 21.

[0054] Among them, the rectifier circuit can be a circuit that converts to direct current, and can include an AC / DC circuit and a DC / DC circuit. The rectifier circuit can convert alternating current with one voltage value or current value into direct current with another voltage value or current value, or convert direct current with one voltage value or current value into direct current with another voltage value or current value. In this embodiment, the rectifier circuit can convert the external power supply into stable direct current required by the power supply control circuit of the ring main unit. Further, the power supply device of the ring main unit can also include a fifth switch and a sixth switch, and the first input terminal of the rectifier circuit is connected to the first output terminal of the external power supply through the fifth switch, and the second input terminal of the rectifier circuit is connected to the second output terminal of the external power supply through the sixth switch. In this embodiment, the connection between the rectifier circuit and the external power supply can be controlled by the fifth switch and the sixth switch, indicating that the connection between the power supply device of the ring main unit and the external power supply can be controlled by the fifth switch and the sixth switch. Of course, the rectifier circuit also has a filtering function.

[0055] When the rectifier circuit includes an AC / DC circuit and a DC / DC circuit, the connection relationship between the rectifier circuit and the external power supply connection end can be specifically as follows:

[0056] The first input terminal and the second input terminal of the AC / DC circuit are the external power supply connection ends, and the first input terminal and the second input terminal of the DC / DC circuit are the external power supply connection ends;

[0057] The connection relationship between the rectifier circuit and the first filter circuit and the second filter circuit can be specifically as follows:

[0058] The first output terminal of the AC / DC circuit is connected to the first input terminal of the first filter circuit, and the second output terminal of the AC / DC circuit is connected to the second input terminal of the first filter circuit;

[0059] The first output terminal of the DC / DC circuit is connected to the first input terminal of the first filter circuit, and the second output terminal of the DC / DC circuit is connected to the second input terminal of the first filter circuit;

[0060] The first output terminal of the AC / DC circuit is connected to the first input terminal of the second filter circuit, and the second output terminal of the AC / DC circuit is connected to the second input terminal of the second filter circuit;

[0061] The first output terminal of the DC / DC circuit is connected to the first input terminal of the second filter circuit, and the second output terminal of the DC / DC circuit is connected to the second input terminal of the second filter circuit.

[0062] Among them, the AC / DC circuit, that is, the AC-to-DC circuit, is a circuit that converts an AC power supply (AC) into a DC power supply (DC). The DC / DC circuit, that is, the DC-to-DC circuit, refers to a circuit that converts the voltage or current of a DC power supply into a DC power with a different voltage or current level.

[0063] In this embodiment, the external power supply can be powered through the PT (voltage transformer) of the AC220V bus, or can be powered through the power supply socket of AC220V. Among them, the voltage transformer is a device used to convert high voltage into low voltage in proportion.

[0064] When the external power supply is powered through the power supply socket of AC220V, in this embodiment, the first terminal of the power supply socket can be electrically connected to the first input terminal of the rectifier circuit through the fifth switch, and the second terminal of the power supply socket can be electrically connected to the second input terminal of the rectifier circuit through the sixth switch. The connection or disconnection between the rectifier circuit and the power supply socket is controlled by the fifth switch and the sixth switch. Further, when the external power supply is powered through the power supply socket of AC220V, the PT needs to be disconnected to prevent reverse power transmission of the PT.

[0065] Among them, the first filter circuit and the second filter circuit can be circuits for filtering, filtering out the noise and interference components in the direct current, reducing the AC components in the direct current, retaining its DC components, so that the ripple coefficient of the direct current is reduced, and the direct current is smoother and purer. In this embodiment, the first filter circuit or the second filter circuit can be used alone to filter the direct current, or the first filter circuit and the second filter circuit can be used simultaneously to filter the direct current. Further, in this embodiment, the AC / DC circuit and the DC / DC circuit can be integrated into a rectification module (such as a rectification chip).

[0066] The first switch, the second switch, the third switch, and the fourth switch can all be miniature circuit breakers. In this embodiment, by controlling the opening and closing of the first switch, the second switch, the third switch, and the fourth switch, it is possible to control the use of the first filter circuit or the second filter circuit to filter the direct current, and to control the use of the first filter circuit and the second filter circuit to filter the direct current simultaneously.

[0067] A power supply device for a ring main unit provided by the present application can supply stable direct current to the ring main unit in the cable distribution box through a rectification circuit and a filtering circuit. Since the stability of direct current is higher than that of alternating current, the rectification circuit can improve the stability of the external power supply, and further, the filtering circuit can also eliminate the fluctuations of the external power supply caused by environmental factors as much as possible. Therefore, this device can effectively reduce the impact on the ring main unit or other partial devices in the cable distribution box.

[0068] In a possible implementation, the power supply device of the ring main unit further includes a battery pack 22, as Figure 2 shown in the connection schematic diagram of the battery pack;

[0069] The third output terminal 23 of the rectification circuit 1 is connected to the first input terminal 25 of the battery pack 22, and the fourth output terminal 24 of the rectification circuit 1 is connected to the second input terminal 26 of the battery pack 22;

[0070] The first output terminal 27 of the battery pack 22 is connected to the third input terminal 29 of the first filtering circuit 2, and the second output terminal 28 of the battery pack 22 is connected to the fourth input terminal 30 of the first filtering circuit 2;

[0071] The first output terminal 27 of the battery pack 22 is connected to the third input terminal 31 of the second filtering circuit 3, and the second output terminal 28 of the battery pack 22 is connected to the fourth input terminal 32 of the second filtering circuit 3.

[0072] Among them, except for the external power supply, in this embodiment, a battery pack can also be arranged inside the power supply device of the ring main unit, so that this embodiment can supply power to the ring main unit independently of the external power supply, or can supply power to the ring main unit together with the external power supply. In this embodiment, the first output terminal of the battery is connected to the third input terminal of the first filtering circuit, and the second output terminal of the battery pack is connected to the fourth input terminal of the first filtering circuit, so that the battery pack can supply power to the ring main unit through the first filtering circuit, and the first filtering circuit can filter the direct current output by the battery pack. Further, in this embodiment, the first output terminal of the battery pack is also connected to the third input terminal of the second filtering circuit, and the second output terminal of the battery pack is connected to the fourth input terminal of the second filtering circuit, which is convenient for filtering the direct current output by the battery pack through the second filtering circuit. The battery pack can supply power to the ring main unit alone through the first filtering circuit or the second filtering circuit, or can supply power to the ring main unit through the first filtering circuit and the second filtering circuit at the same time.

[0073] Further, the first input terminal of the battery pack can be integrated with the first output of the battery pack into a terminal with input / output functions, and the second input terminal of the battery pack can be integrated with the second output of the battery pack into a terminal with input / output functions, so that the battery pack can achieve charging and discharging only through a set of terminals with input / output functions.

[0074] In a possible implementation, as Figure 3 shown, the power supply device of the ring main unit further includes a first power indicator lamp 33 and a second power indicator lamp 34.

[0075] Both ends of the first power indicator lamp 33 are respectively connected to the first input terminal 4 and the second input terminal 5 of the rectifying circuit 1.

[0076] Both ends of the second power indicator lamp 34 are respectively connected to the first power supply terminal 16 and the second power supply terminal 17.

[0077] Among them, in this embodiment, both ends of the first power indicator lamp are respectively connected to the first input terminal and the second input terminal of the rectifying circuit, and it can be determined whether there is current input to the power supply device of the ring main unit through the first power indicator lamp, indicating that it can be determined whether the external power supply outputs current through the first power indicator lamp. In this embodiment, both ends of the second power indicator lamp are respectively connected to the first power supply terminal and the second power supply terminal, and it can be determined whether the power supply device of the ring main unit outputs current through the second power indicator lamp.

[0078] In a possible implementation, the third input terminal of the first filtering circuit is connected to the third input terminal of the second filtering circuit, and the third output terminal of the first filtering circuit is connected to the third output terminal of the second filtering circuit.

[0079] Among them, when the first filtering circuit and the second filtering circuit operate simultaneously, in this embodiment, the third input terminal of the first filtering circuit can be connected to the third input terminal of the second filtering circuit, and the third output terminal of the first filtering circuit can be connected to the third output terminal of the second filtering circuit, so as to achieve current sharing between the first filtering circuit and the second filtering circuit.

[0080] In a possible implementation, it further includes an intelligent monitoring device, and a monitoring parameter output interface is provided on the power supply device of the ring main unit;

[0081] The intelligent monitoring device is connected to the monitoring parameter output interface.

[0082] Among them, the intelligent monitoring device can be a device for implementing various system settings, battery management, voltage setting, system maintenance, signal acquisition and uploading, etc. The intelligent monitoring device can monitor the operating status of the battery pack through the monitoring parameter output interface. Specifically, the intelligent monitoring device can monitor the charging status of the battery pack, whether the battery pack supplies power abnormally, etc. Of course, the intelligent monitoring device can also monitor the operating status of the rectifying circuit and the filtering circuit.

[0083] Further, as Figure 4 shown in the schematic diagram of the placement position of the power supply device of the ring main unit in the cable distribution box, the power supply device of the ring main unit can be arranged in the cable distribution box. The power supply device of the ring main unit can include a box body 35, and the box body is arranged on one side of the ring main unit. In this embodiment, the box body is provided to facilitate the centralized arrangement of the rectifying circuit, the first filtering circuit, the second filtering circuit, the battery pack and other devices in the box body. Arranging the power supply device of the ring main unit in the cable distribution box can also reduce the influence of environmental factors on the power supply device.

[0084] In addition, it should be noted that the device embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the device embodiments provided in this application, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines.

[0085] Each embodiment in this specification is described in a related manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized.

[0086] It can be understood that before using the technical solutions disclosed in the embodiments of the present disclosure, the types, usage scopes, usage scenarios, etc. of the personal information involved in the present disclosure should be informed to users and the authorization of users should be obtained in an appropriate manner in accordance with relevant laws and regulations.

[0087] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power supply device for a ring main unit, characterized in that, The power supply device of the ring main unit includes a rectification circuit, a first filter circuit and a second filter circuit. The first input terminal and the second input terminal of the rectification circuit are external power supply connection terminals. The first output terminal of the rectification circuit is connected to the first input terminal of the first filter circuit, and the second output terminal of the rectification circuit is connected to the second input terminal of the first filter circuit. The first output terminal of the rectification circuit is connected to the first input terminal of the second filter circuit, and the second output terminal of the rectification circuit is connected to the second input terminal of the second filter circuit. The first output terminal of the first filter circuit is connected to the first power supply terminal for supplying power to the ring main unit through a first switch, and the second output terminal of the first filter circuit is connected to the second power supply terminal for supplying power to the ring main unit through a second switch. The first output terminal of the second filter circuit is connected to the first power supply terminal through a third switch, and the second output terminal of the second filter circuit is connected to the second power supply terminal through a fourth switch.

2. The power supply device of the ring main unit according to claim 1, characterized in that, The power supply device of the ring main unit further includes a battery pack. The third output terminal of the rectification circuit is connected to the first input terminal of the battery pack, and the fourth output terminal of the rectification circuit is connected to the second input terminal of the battery pack. The first output terminal of the battery pack is connected to the third input terminal of the first filter circuit, and the second output terminal of the battery pack is connected to the fourth input terminal of the first filter circuit. The first output terminal of the battery pack is connected to the third input terminal of the second filter circuit, and the second output terminal of the battery pack is connected to the fourth input terminal of the second filter circuit.

3. The power supply device of the ring main unit according to claim 1, characterized in that, The power supply device of the ring main unit further includes a fifth switch and a sixth switch. The first input terminal of the rectification circuit is connected to the first output terminal of the external power supply through the fifth switch, and the second input terminal of the rectification circuit is connected to the second output terminal of the external power supply through the sixth switch.

4. The power supply device of the ring main unit according to claim 1, characterized in that, The rectification circuit includes an AC / DC circuit and a DC / DC circuit. The first input terminal and the second input terminal of the AC / DC circuit are external power supply connection terminals, and the first input terminal and the second input terminal of the DC / DC circuit are external power supply connection terminals. The first output terminal of the AC / DC circuit is connected to the first input terminal of the first filter circuit, and the second output terminal of the AC / DC circuit is connected to the second input terminal of the first filter circuit. The first output terminal of the DC / DC circuit is connected to the first input terminal of the first filter circuit, and the second output terminal of the DC / DC circuit is connected to the second input terminal of the first filter circuit. The first output terminal of the AC / DC circuit is connected to the first input terminal of the second filter circuit, and the second output terminal of the AC / DC circuit is connected to the second input terminal of the second filter circuit. The first output terminal of the DC / DC circuit is connected to the first input terminal of the second filtering circuit, and the second output terminal of the DC / DC circuit is connected to the second input terminal of the second filtering circuit.

5. The power supply device of the ring main unit according to claim 1, wherein, The power supply device of the ring main unit further includes a first power indicator light. Both ends of the first power indicator light are respectively connected to the first input terminal and the second input terminal of the rectifying circuit.

6. The power supply device of the ring main unit according to claim 1, characterized in that, The power supply device of the ring main unit further includes a second power indicator light. Both ends of the second power indicator light are respectively connected to the first power supply terminal and the second power supply terminal.

7. The power supply device of the ring main unit according to claim 3, characterized in that, It further includes: A socket for connecting an external power supply. The first terminal of the socket is electrically connected to the first input terminal of the rectifying circuit through the fifth switch, and the second terminal of the socket is electrically connected to the second input terminal of the rectifying circuit through the sixth switch.

8. The power supply device of the ring main unit according to claim 1, characterized in that The third input terminal of the first filtering circuit is connected to the third input terminal of the second filtering circuit, and the third output terminal of the first filtering circuit is connected to the third output terminal of the second filtering circuit.

9. The power supply device of the ring main unit according to claim 2, characterized in that, The power supply device of the ring main unit further includes a box body. The rectifying circuit, the first filtering circuit, the second filtering circuit and the battery pack are all arranged in the box body. The box body is arranged on one side of the ring main unit.

10. The power supply device of the ring main unit according to claim 9, characterized in that, It further includes an intelligent monitoring device, and a monitoring parameter output interface is arranged on the power supply device of the ring main unit. The intelligent monitoring device is connected to the monitoring parameter output interface.

Images