Dual power supply switching electrical system

Abstract

The utility model provides a dual-power-supply switching electrical system, and relates to the technical field of power supply. In the system, one end of an incoming line isolation cabinet is connected with one end of a third bus, the other end of the third bus is connected with one end of a main incoming line switch cabinet, the other end of the main incoming line switch cabinet is connected with one end of a first bus, the other end of the first bus is connected with one end of a mother branch switch cabinet, and the other end of the mother branch switch cabinet is connected with one end of a second bus. The other end of the second bus is connected with one end of the security wire switch cabinet, the other end of the security wire switch cabinet is used for being connected with a factory substation, and the other end of the incoming line isolation cabinet is used for being connected with commercial power. When maintenance and overhaul are needed, under the one-out-of-three mode, the overhaul section is isolated, and loss is reduced. In the two-out-of-three mode, even if one of the commercial power or the plant substation breaks down, the first bus and the second bus can be ensured to be electrified at the same time, so that the stability of power supply is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field, specifically, relate to a double power supply switching electrical system. BACKGROUND

[0002] With the rapid development of industrialization and urbanization, the scale of power system is expanding, and the requirement of power supply reliability is also higher and higher. In the early stage of power system development, single busbar power supply mode is widely used because of its simple structure and low investment cost.

[0003] Although the single busbar power supply system is simple in structure, its limitation is also very obvious. First, the system reliability is low, once the main power supply fails, the whole system will lose power supply; second, the system maintenance and overhaul are difficult, need to stop power supply, influence power supply continuity, bring great inconvenience to production and life. UTILITY MODEL CONTENTS

[0004] The utility model solves the problem that the existing power supply system loses power supply and influences power supply continuity when power supply fails or overhauls.

[0005] In order to solve the above problem, the utility model provides a double power supply switching electrical system, which comprises: a third busbar, a incoming line isolation cabinet, a main incoming line switch cabinet, a busbar switch cabinet, a safety line switch cabinet, a first busbar and a second busbar.

[0006] One end of the incoming line isolation cabinet is connected with one end of the third busbar, the other end of the third busbar is connected with one end of the main incoming line switch cabinet, the other end of the main incoming line switch cabinet is connected with one end of the first busbar, the other end of the first busbar is connected with one end of the busbar switch cabinet, the other end of the busbar switch cabinet is connected with one end of the second busbar, the other end of the second busbar is connected with one end of the safety line switch cabinet, the other end of the safety line switch cabinet is used for being connected with a factory substation, and the other end of the incoming line isolation cabinet is used for being connected with a city power supply.

[0007] Optionally, the double power supply switching electrical system further comprises a quick switching electrical interlocking switch, and the quick switching electrical interlocking switch is connected with the main incoming line switch cabinet, the busbar switch cabinet and the safety line switch cabinet.

[0008] Optionally, the double power supply switching electrical system further comprises a first main transformer switch cabinet, a second main transformer switch cabinet, a first transformer, a second transformer, a low-voltage first section busbar and a low-voltage third section busbar.

[0009] One end of the first main transformer switch cabinet is connected with the first busbar, and the connection point is located between the main incoming line switch cabinet and the busbar switch cabinet; the other end of the first main transformer switch cabinet is connected with one end of the first transformer, the other end of the first transformer is connected with the low-voltage three-section busbar, a plurality of production electrical equipment are connected to the low-voltage three-section busbar, and the low-voltage three-section busbar is used to be connected with the plant substation.

[0010] One end of the second main transformer switch cabinet is connected with the second busbar, and the connection point is located between the busbar switch cabinet and the safety line switch cabinet; the other end of the second main transformer switch cabinet is connected with one end of the second transformer, the other end of the second transformer is connected with the low-voltage one-section busbar, a plurality of production electrical equipment are connected to the low-voltage one-section busbar, and the low-voltage one-section busbar is used to be connected with the plant substation.

[0011] Optionally, the dual-power switching electrical system further comprises a third transformer, a low-voltage two-section busbar and a second low-voltage busbar switch cabinet.

[0012] One end of the third transformer is used to be connected with the plant substation, and the other end of the third transformer is connected with the low-voltage two-section busbar; a plurality of production electrical equipment are connected to the low-voltage two-section busbar.

[0013] Two ends of the second low-voltage busbar switch cabinet are respectively connected with one end of the low-voltage one-section busbar and one end of the low-voltage two-section busbar.

[0014] Optionally, the dual-power switching electrical system further comprises a fourth transformer, a low-voltage four-section busbar and a first low-voltage busbar switch cabinet.

[0015] One end of the fourth transformer is used to be connected with the plant substation, and the other end of the fourth transformer is connected with the low-voltage four-section busbar; a plurality of production electrical equipment are connected to the low-voltage four-section busbar.

[0016] Two ends of the first low-voltage busbar switch cabinet are respectively connected with one end of the low-voltage three-section busbar and one end of the low-voltage four-section busbar.

[0017] Optionally, the dual-power switching electrical system further comprises a low-voltage standby section, a low-voltage emergency section, a diesel generator, a first standby section switch cabinet and a second standby section switch cabinet.

[0018] One end of the first standby section switch cabinet is respectively connected with one end of the low-voltage standby section and one end of the diesel generator, and the other end of the first standby section switch cabinet is connected with the other end of the low-voltage four-section busbar.

[0019] One end of the second standby section switch cabinet is respectively connected with one end of the low-voltage emergency section and the other end of the diesel generator, and the other end of the second standby section switch cabinet is connected with the other end of the low-voltage three-section busbar.

[0020] Optionally, the low-voltage standby section and the low-voltage emergency section are both connected with the standby load.

[0021] The utility model provides a kind of dual power switching electrical system.Compared with prior art, it has the following beneficial effects:

[0022] The system is composed of two independent power supply lines, which are the incoming line power connected with the first busbar and the incoming line power connected with the second busbar, and realizes the dual power standby mechanism together.The main incoming line switch cabinet remains in a state of communication, and in the case of any power line breakage, the opening and closing state of the incoming line isolation cabinet, the busbar switch cabinet and the safety line switch cabinet is converted to realize the following two switching modes: three options one mode and three options two mode.In the three options one mode, if the incoming line isolation cabinet is closed and the busbar switch cabinet and the safety line switch cabinet are opened, only the first busbar remains in an electrified state;otherwise, if the incoming line isolation cabinet is opened, the busbar switch cabinet is opened, and the safety line switch cabinet is closed, only the second busbar is electrified.When maintenance and repair are needed, the isolation repair section can be maintained in the three options one mode, and the other section is kept powered on to reduce losses.In the three options two mode, whether the incoming line isolation cabinet is opened, the busbar switch cabinet is closed and the safety line switch cabinet is closed, or the incoming line isolation cabinet is closed, the busbar switch cabinet is closed and the safety line switch cabinet is opened, the first busbar and the second busbar can be electrified at the same time, and even if the power supply or the substation in the factory area fails, the entire system can still maintain power supply, thereby improving the stability of power supply. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 The structure diagram of the dual power switching electrical system provided by the embodiments of the utility model.

[0025] MARKED FOR EXPLANATION

[0026] 1. Third busbar; 2. Incoming line isolation cabinet; 3. First metering cabinet; 4. Main incoming line switchgear; 5. First main transformer switchgear; 6. Bus branch switchgear; 7. Second main transformer switchgear; 8. Safety line switchgear; 9. First busbar; 10. Second busbar; 11. First transformer; 12. Second transformer; 13. Third transformer; 14. Fourth transformer; 15. Low-voltage section 1 busbar; 16. Low-voltage section 2 busbar; 17. Low-voltage section 3 busbar; 18. Low-voltage section 4 busbar; 19. Low-voltage standby section; 20. Low-voltage emergency section; 21. Diesel generator; 22. Quick-connect electrical interlock switch; 23. First low-voltage bus tie cabinet; 24. First standby section switchgear; 25. Second standby section switchgear; 26. Second low-voltage bus tie cabinet. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0029] like Figure 1 As shown in the figure, the dual power supply switching electrical system provided in this application includes: a third busbar 1, an incoming line isolation cabinet 2, a main incoming line switch cabinet 4, a bus branch switch cabinet 6, a safety line switch cabinet 8, a first busbar 9, and a second busbar 10;

[0030] One end of the incoming line isolation cabinet 2 is connected to one end of the third busbar 1, the other end of the third busbar 1 is connected to one end of the main incoming line switch cabinet 4, the other end of the main incoming line switch cabinet 4 is connected to one end of the first busbar 9, the other end of the first busbar 9 is connected to one end of the bus branch switch cabinet 6, the other end of the bus branch switch cabinet 6 is connected to one end of the second busbar 10, the other end of the second busbar 10 is connected to one end of the safety line switch cabinet 8, the other end of the safety line switch cabinet 8 is used to connect to the plant substation, and the other end of the incoming line isolation cabinet 2 is used to connect to the mains power.

[0031] Specifically, a first metering cabinet 3 can be installed at the power input end of the first busbar 9. The two ends of the first metering cabinet 3 are respectively connected to the other end of the third busbar 1 and one end of the main incoming switch cabinet 4, so as to measure the power consumption.

[0032] In the embodiment, the system is composed of two independent power supply lines, namely the incoming line power connected to the first busbar 9 and the incoming line power connected to the second busbar 10, which together realize the dual power backup mechanism, wherein the first busbar 9 is connected to the 10kv municipal power through the main incoming line switch cabinet 4, the third busbar 1 and the incoming line isolation cabinet 2, and the second busbar 10 is connected to the power substation in the factory area for power supply. The first busbar 9 and the second busbar 10 are connected to each other through the busbar switch cabinet 6, ensuring the continuity of power supply. Specifically, the main incoming line switch cabinet 4 remains in a connected state, and in the case of a broken line of any power supply line, the opening and closing states of the incoming line isolation cabinet 2, the busbar switch cabinet 6 and the safety line switch cabinet 8 are converted, realizing the following two switching modes: three out of one mode and three out of two mode. In the three out of one mode, if the incoming line isolation cabinet 2 is closed and the busbar switch cabinet 6 and the safety line switch cabinet 8 are opened, only the first busbar 9 remains in a live state; on the contrary, if the incoming line isolation cabinet 2 is opened, the busbar switch cabinet 6 is opened, and the safety line switch cabinet 8 is closed, only the second busbar 10 is live. When maintenance and repair are needed, the three out of one mode can be used to isolate the maintenance section and keep the other section powered on, reducing losses. In the three out of two mode, whether the incoming line isolation cabinet 2 is opened, the busbar switch cabinet 6 is closed and the safety line switch cabinet 8 is closed, or the incoming line isolation cabinet 2 is closed, the busbar switch cabinet 6 is closed and the safety line switch cabinet 8 is opened, both can ensure that the first busbar 9 and the second busbar 10 are live at the same time. Even if the municipal power or the power substation in the factory area fails, the entire system can still maintain power supply, thereby improving the stability of power supply.

[0033] As Figure 1 shown in the optional embodiment of the utility model, the dual power switching electrical system further comprises a quick switching electrical interlocking switch 22 connected with the main incoming line switch cabinet 4, the busbar switch cabinet 6 and the safety line switch cabinet 8.

[0034] Specifically, a variety of loads can be connected to the first busbar 9 and the second busbar 10, such as a plurality of refrigeration units. Using the electrical drive interlocking switch, the main incoming line switch cabinet 4, the busbar switch cabinet 6 and the safety line switch cabinet 8 are combined according to the three out of one mode and the three out of two mode to form a variety of opening and closing combination modes. Each combination mode can correspond to a different working mode of the electrical drive device, control the electrical drive device to work so that the three switch cabinets reach different opening and closing states, thereby realizing faster power switching. The time used for each switching is about 0-30 milliseconds, reducing the time of power interruption and meeting the requirements of high continuity of power supply. The time used by the existing switch mode is about 10 seconds. Compared with the time used by the existing switch mode, the switching time is greatly shortened, thereby also reducing the downtime loss caused by switching interruption. In addition, due to the shortening of the switching time, the power phases before and after switching can be quickly aligned, reducing the impact on the load.

[0035] As Figure 1As shown, in an optional embodiment of this utility model, the dual power supply switching electrical system further includes a first main transformer switch cabinet 5, a second main transformer switch cabinet 7, a first transformer 11, a second transformer 12, a low-voltage first-section busbar 15, and a low-voltage third-section busbar 17.

[0036] One end of the first main transformer switchgear 5 is connected to the first busbar 9, and the connection point is located between the main incoming switchgear 4 and the bus branch switchgear 6; the other end of the first main transformer switchgear 5 is connected to one end of the first transformer 11, and the other end of the first transformer 11 is connected to the low-voltage three-section busbar 17. Multiple production electrical equipment are connected to the low-voltage three-section busbar 17, and the low-voltage three-section busbar 17 is used to connect to the plant substation.

[0037] One end of the second main transformer switchgear 7 is connected to the second busbar 10, and the connection point is located between the bus branch switchgear 6 and the safety line switchgear 8; the other end of the second main transformer switchgear 7 is connected to one end of the second transformer 12, and the other end of the second transformer 12 is connected to the low-voltage first-stage busbar 15. Multiple production electrical equipment are connected to the low-voltage first-stage busbar 15, and the low-voltage first-stage busbar 15 is used to connect to the plant substation.

[0038] Specifically, in addition to introducing mains power from the incoming isolation cabinet 2 or from the safety switch cabinet 8 into the plant substation, a first main transformer switch cabinet 5 and a second main transformer switch cabinet 7 are also installed. Through the first transformer 11 and the second transformer 12, the power from the plant substation is introduced into the first busbar 9 and the second busbar 10 via the low-voltage first-section busbar 15 and the low-voltage third-section busbar 17. During power supply, the first main transformer switch cabinet 5 and the second main transformer switch cabinet 7 can be closed to prioritize the use of the power from the plant substation introduced from the low-voltage first-section busbar 15 and the low-voltage third-section busbar 17. Simultaneously, it can also supply power to the low-voltage equipment on the low-voltage first-section busbar 15 and the low-voltage third-section busbar 17. The power introduced from the plant substation is controllable, stable, and relatively inexpensive.

[0039] like Figure 1 As shown, in an optional embodiment of this utility model, the dual power supply switching electrical system further includes a third transformer 13, a low-voltage second-stage busbar 16, and a second low-voltage bus tie cabinet 26.

[0040] One end of the third transformer 13 is used to connect to the substation in the plant area, and the other end of the third transformer 13 is connected to the low-voltage second busbar 16, on which multiple production electrical equipment are connected.

[0041] The two ends of the second low-voltage bus tie cabinet 26 are respectively connected to one end of the low-voltage first-stage bus 15 and one end of the low-voltage second-stage bus 16.

[0042] Similarly, the dual-power switching electrical system also includes a fourth transformer 14, a low-voltage four-section busbar 18, and a first low-voltage bus tie cabinet 23;

[0043] One end of the fourth transformer 14 is used to connect to the substation in the plant area, and the other end of the fourth transformer 14 is connected to the low-voltage four-section busbar 18, on which multiple production electrical equipment are connected.

[0044] The two ends of the first low-voltage bus tie cabinet 23 are respectively connected to one end of the low-voltage three-section bus 17 and one end of the low-voltage four-section bus 18.

[0045] Specifically, a low-voltage bus tie cabinet is used to connect the low-voltage busbar 15 and the low-voltage busbar 16, as well as the low-voltage busbar 17 and the low-voltage busbar 18. When the first low-voltage bus tie cabinet 23 or the second low-voltage bus tie cabinet 26 is closed, the power of the plant substation is transformed by the third transformer 13 and the fourth transformer 14, and the power of the plant substation can be introduced into the four low-voltage busbars to provide power to the electrical equipment on the four low-voltage busbars. At the same time, through the first transformer 11 and the second transformer 12, the power of two or four low-voltage busbars can be introduced into the first busbar 9 and the second busbar 10 at one time, thereby improving the load capacity of the busbars.

[0046] In addition, the system has a rapid fault isolation function. When any section of the busbar or transformer fails, it can quickly isolate the problem, ensuring that production activities are not affected. In the low-voltage section, the system is divided into four busbar sections, with low-voltage busbar 15, low-voltage busbar 26, low-voltage busbar 3, and low-voltage busbar 4 connected by low-voltage bus tie cabinets. During operation, if any section of the low-voltage busbar fails, the system can immediately isolate the faulty section while maintaining the normal operation of the electrical equipment on other busbar sections. For example, if low-voltage busbar 15 fails, the second low-voltage bus tie cabinet 26 can be disconnected, while low-voltage busbar 26 remains energized. The safety switch cabinet 8 is closed, diverting power from the plant substation to the second busbar 10, thus isolating and disconnecting low-voltage busbar 15.

[0047] like Figure 1 As shown, in an optional embodiment of this utility model, the dual power supply switching electrical system further includes a low-voltage standby section 19, a low-voltage emergency section 20, a diesel generator 21, a first standby section switch cabinet 24, and a second standby section switch cabinet 25.

[0048] One end of the first standby section switchgear 24 is connected to one end of the low-voltage standby section 19 and one end of the diesel generator 21, respectively, and the other end of the first standby section switchgear 24 is connected to the other end of the low-voltage four-section busbar 18.

[0049] The second standby section switch cabinet 25 is connected with one end of the low-voltage emergency section 20 and the other end of the diesel generator 21 respectively, and the other end of the second standby section switch cabinet 25 is connected with the other end of the low-voltage three-section bus 17. The low-voltage standby section 19 and the low-voltage emergency section 20 are connected with standby loads.

[0050] Specifically, in an emergency, the first standby section switch cabinet 24 and the second standby section switch cabinet 25 are closed, and the diesel generator 21 will serve as a standby power supply for the key equipment on the low-voltage three-section bus 17 and the low-voltage four-section bus 18. Once the incoming power supply of the first bus 9 and the second bus 10 is simultaneously interrupted, the diesel generator 21 will automatically start, and through the low-voltage three-section bus 17, the low-voltage four-section bus 18 and the first transformer 11, the diesel generator 21 will supply power to the first bus 9 and the second bus 10, thereby providing necessary power support for important equipment that cannot be shut down, so as to ensure the continuity and safety of the production process. At the same time, standby loads can also be temporarily connected to the low-voltage standby section 19 and the low-voltage emergency section 20.

[0051] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0052] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual-power switching electrical system, characterized in that, include: Third busbar (1), incoming line isolation cabinet (2), main incoming line switch cabinet (4), bus branch switch cabinet (6), security line switch cabinet (8), first busbar (9) and second busbar (10); One end of the incoming line isolation cabinet (2) is connected to one end of the third busbar (1), the other end of the third busbar (1) is connected to one end of the main incoming line switch cabinet (4), the other end of the main incoming line switch cabinet (4) is connected to one end of the first busbar (9), the other end of the first busbar (9) is connected to one end of the bus branch switch cabinet (6), the other end of the bus branch switch cabinet (6) is connected to one end of the second busbar (10), the other end of the second busbar (10) is connected to one end of the safety line switch cabinet (8), the other end of the safety line switch cabinet (8) is used to connect to the substation in the plant area, and the other end of the incoming line isolation cabinet (2) is used to connect to the mains power.

2. The dual-power switching electrical system as described in claim 1, characterized in that, It also includes a quick-switching electrical interlock switch (22), which is connected to the main incoming line switch cabinet (4), the bus branch switch cabinet (6) and the security line switch cabinet (8).

3. The dual-power switching electrical system as described in claim 1, characterized in that, It also includes the first main transformer switchgear (5), the second main transformer switchgear (7), the first transformer (11), the second transformer (12), the low-voltage first-section busbar (15), and the low-voltage third-section busbar (17); One end of the first main transformer switchgear (5) is connected to the first busbar (9), and the connection point is located between the main incoming switchgear (4) and the bus branch switchgear (6); the other end of the first main transformer switchgear (5) is connected to one end of the first transformer (11), and the other end of the first transformer (11) is connected to the low-voltage three-section busbar (17). Multiple production electrical equipment are connected to the low-voltage three-section busbar (17), and the low-voltage three-section busbar (17) is used to connect to the substation in the plant area. One end of the second main transformer switchgear (7) is connected to the second busbar (10), and the connection point is located between the bus branch switchgear (6) and the security line switchgear (8); the other end of the second main transformer switchgear (7) is connected to one end of the second transformer (12), and the other end of the second transformer (12) is connected to the low-voltage first-stage busbar (15). The low-voltage first-stage busbar (15) is used to connect multiple production electrical equipment, and the low-voltage first-stage busbar (15) is used to connect to the plant substation.

4. The dual-power switching electrical system as described in claim 3, characterized in that, It also includes a third transformer (13), a low-voltage second-section busbar (16), and a second low-voltage bus tie cabinet (26); One end of the third transformer (13) is used to connect to the substation in the plant area, and the other end of the third transformer (13) is connected to the low-voltage second busbar (16). Multiple production electrical equipment are connected to the low-voltage second busbar (16). The two ends of the second low-voltage bus tie cabinet (26) are respectively connected to one end of the low-voltage first-stage busbar (15) and one end of the low-voltage second-stage busbar (16).

5. The dual-power switching electrical system as described in claim 3, characterized in that, It also includes the fourth transformer (14), the four low-voltage busbars (18), and the first low-voltage bus tie cabinet (23); One end of the fourth transformer (14) is used to connect to the substation in the plant area, and the other end of the fourth transformer (14) is connected to the low-voltage four-section busbar (18). Multiple production electrical equipment are connected to the low-voltage four-section busbar (18). The two ends of the first low-voltage bus tie cabinet (23) are respectively connected to one end of the low-voltage three-section busbar (17) and one end of the low-voltage four-section busbar (18).

6. The dual-power switching electrical system as described in claim 5, characterized in that, It also includes a low-voltage standby section (19), a low-voltage emergency section (20), a diesel generator (21), a first standby section switchgear (24), and a second standby section switchgear (25); One end of the first standby section switchgear (24) is connected to one end of the low-voltage standby section (19) and one end of the diesel generator (21), respectively, and the other end of the first standby section switchgear (24) is connected to the other end of the low-voltage four-section busbar (18). One end of the second standby section switchgear (25) is connected to one end of the low-voltage emergency section (20) and the other end of the diesel generator (21), and the other end of the second standby section switchgear (25) is connected to the other end of the low-voltage three-section busbar (17).

7. The dual-power switching electrical system as described in claim 6, characterized in that, Both the low-voltage standby section (19) and the low-voltage emergency section (20) are connected to standby loads.

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