Capacitor system for standard container and standard container comprising capacitor system

Abstract

There is provided a capacitor system for a standard container and a standard container including the same, the capacitor system including: a capacitor bank configured to be mounted within the standard container; the air-core reactor is configured to be stacked outside the standard container, is electrically connected with the capacitor bank and is used for limiting closing inrush current and suppressing power grid harmonic waves; and the fence is used for covering the air-core reactor and forms electrical locking with the capacitor bank. The capacitor system supports a capacitor bank with multiple voltage levels from 6.6 KV to 33KV, can meet the voltage requirements of different users, achieves the dual functions of limiting the closing inrush current and suppressing harmonic waves of the air-core reactor, and effectively protects the safety of a power grid. The problem that only a small-size current-limiting reactor can be adopted and power grid harmonic waves cannot be suppressed when a capacitor bank above 10KV is installed in an existing standard container is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the capacitor field, especially relate to a capacitor system for standard container and the standard container including capacitor system. BACKGROUND

[0002] The statements in this section merely provide background information related to the present utility model and can not constitute the prior art.

[0003] In power systems, capacitor banks are widely used for reactive power compensation and voltage quality improvement. With the increasing demand for power quality and efficiency, the demand for capacitor banks suitable for different voltage levels is also growing. In particular, in the application scenarios of 10kV and below voltage levels, in order to adapt to the space limitations of standard containers, relatively small or more compact current limiting reactors are generally used to limit the closing inrush current. However, current limiting reactors are mainly designed to reduce the transient current peak generated when the capacitor is switched on, and they do not have the ability to suppress grid harmonics, which limits their application range and makes it difficult to meet the user's demand for comprehensive performance.

[0004] For high voltage levels such as 20kV and 33kV, the market demand for capacitor banks for standard containers is growing. Although core reactors can be used at these higher voltage levels, they are costly and prone to magnetic saturation, which can lead to unstable tuning effects and thus affect the overall performance of the system. In addition, due to limited space, traditional designs often have to sacrifice heat dissipation or operational flexibility to meet the installation requirements within the standard container, thereby limiting the flexibility and applicability of the product. SUMMARY

[0005] In order to solve the above problems and better serve the diversified needs of users, it is necessary to develop a new type of capacitor bank solution that not only can efficiently operate in such a small space as a standard container, but also can limit the closing inrush current and provide good harmonic suppression capability and stable tuning performance, while ensuring safe and reliable operation and convenient transportation conditions.

[0006] To achieve the above purpose, the first aspect of the present disclosure provides a capacitor system for a standard container, comprising: a capacitor bank configured to be installed within the standard container; an air-core reactor configured to be stacked outside the standard container and electrically connected to the capacitor bank; a fence configured to cover the air-core reactor and form an electrical lock with the capacitor bank.

[0007] In some embodiments, the air-core reactor is electrically connected to the capacitor bank by a wall bushing.

[0008] In some embodiments, the capacitor bank comprises a plurality of capacitor branches, each of the capacitor branches comprising a plurality of capacitors.

[0009] In some embodiments, the capacitor system further comprises a vacuum circuit breaker connected in series with a corresponding one of the plurality of capacitor branches.

[0010] In some embodiments, the capacitors are connected in a double star configuration.

[0011] In some embodiments, the capacitor bank is provided with a disconnector at the incoming line side.

[0012] In some embodiments, each of the capacitor branches comprises a first current transformer installed at the incoming line of the capacitor branch and a second current transformer installed at the outgoing line of the capacitor branch.

[0013] A second aspect of the present disclosure provides a standard container comprising the capacitor system as described above.

[0014] In some embodiments, the lower part of one side wall of the standard container is provided with an air intake fan, the upper part of the opposite side wall is provided with an air exhaust fan, and the air intake fan and the air exhaust fan are respectively provided with detachable air intake fan covers and air exhaust fan covers.

[0015] In some embodiments, the outer side of the top of the standard container is provided with a ramp.

[0016] The capacitor system provided in the present application configures the capacitor bank to be installed in the standard container and configures the air-core reactor to be stacked outside the standard container. Thus, the capacitor system can support capacitor banks of multiple voltage levels and achieve the dual functions of limiting the inrush current and suppressing harmonics of the air-core reactor, effectively protecting the safety of the power grid. By setting the fence and the capacitor bank located in the standard container, electrical interlocking is achieved, and the electrical connection between the capacitor bank and the air-core reactor is achieved. The present application effectively solves the problem that when a capacitor bank above 10KV is installed in the existing standard container, only a small-sized current-limiting reactor can be used, and the power grid harmonics cannot be suppressed. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 3 shows a schematic diagram of part of the capacitor system for a standard container according to an embodiment of the present application inside the standard container.

[0018] Figure 2 Fig. 4 shows a plan view of the capacitor system for a standard container according to an embodiment of the present application.

[0019] Figure 3 A-A sectional view of the Figure 1

[0020] Figure 4 B-B sectional view of the Figure 1

[0021] Figure 5 C-C sectional view of the Figure 1

[0022] Figure 6 D-D sectional view of the Figure 1

[0023] Figure 7 E-E sectional view of the Figure 2

[0024] Figure 8 Front view of a standard container according to one embodiment of the present application.

[0025] Figure 9 Rear view of a standard container according to one embodiment of the present application.

[0026] Figure 10 Left view of a standard container according to one embodiment of the present application.

[0027] The meanings of the various reference numerals in the drawings are as follows:

[0028] 1 - standard container; 2 - isolating switch; 3 - control cabinet; 4 - busbar; 5 - wiring cable; 6 - insulator; 7 - slope; 8 - branch connection line; 9 - through-wall bushing; 10 - first current transformer; 11 - wire clamp; 12 - vacuum circuit breaker; 13 - surge arrester; 14 - capacitor; 15 - second current transformer; 16 - fence; 17 - air-core reactor; 18 - steel-cored aluminum stranded wire; 19 - standard container door; 20 - fence net door; 21 - mounting hole; 22 - control cabinet door; 23 - air intake fan outer cover; 24 - air exhaust fan outer cover; 25 - standard container external grounding terminal; 26 - standard container internal grounding terminal. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. It should be noted that the embodiments given by the present application are only for illustration, and do not limit the protection scope of the present application.

[0030] Figure 1 and Figure 2 ​​​​​The schematic diagram of the capacitor system for the standard container is shown in the standard container, and the plane schematic diagram of the capacitor system is shown. Figures 3-6 The schematic diagram of the capacitor system for the standard container is shown in the standard container, and the plane schematic diagram of the capacitor system is shown. Figure 1 The cross-sectional schematic diagram of the A-A section, the B-B section, the C-C section and the D-D section in the capacitor system for the standard container is shown. Figure 7 The cross-sectional schematic diagram of the E-E section in the capacitor system for the standard container is shown. Figure 2 The cross-sectional schematic diagram of the E-E section in the capacitor system for the standard container is shown. Figure 1 The cross-sectional schematic diagram of the E-E section in the capacitor system for the standard container is shown. Figure 2 The cross-sectional schematic diagram of the E-E section in the capacitor system for the standard container is shown. Figures 3 to 7 The capacitor system comprises: a capacitor bank configured to be installed in the inside of the standard container 1; an air-core reactor 17 configured to be stacked on the outside of the standard container 1 and electrically connected with the capacitor bank, preferably, the air-core reactor 17 is electrically connected with the capacitor bank through the bushing 9, and the air-core reactor 17 is used for limiting the closing inrush current and inhibiting the power grid harmonic; and a fence 16 used for covering the air-core reactor 17, the fence 16 forms an electrical lock with the capacitor bank to avoid the personnel from being electrocuted and protect the safety of the personnel. The capacitor system of the embodiment of the application supports the capacitor bank of multiple voltage levels of 6.6KV to 33KV. In the embodiment, the air-core reactor 17 arranged on the outside of the standard container 1 effectively limits the closing inrush current when the capacitor 14 is switched, and inhibits the influence of the power grid harmonic on the system, and the voltage of the capacitor bank arranged in the standard container 1 is 6.6KV to 33KV, which does not affect the normal work of the air-core reactor 17.

[0031] In some embodiments, the capacitor bank comprises a plurality of capacitor branches, as shown in Figure 1 and 2 Preferably, the number of capacitor branches is 2, each capacitor branch comprises a plurality of capacitors 14, and specifically, the number of capacitor branches can be set according to specific requirements and the specifications of the standard container to meet the reactive power compensation requirements of different application scenarios and achieve the optimal compensation effect in the limited space. In some embodiments, the number of capacitors 14 is 12, Figure 1 only one phase of the capacitor branch is shown in the capacitor bank, each capacitor branch has three phases, and preferably, four capacitors 14 are arranged in each phase. In some embodiments, the capacitor 14 can be a parallel capacitor, and in other embodiments, the capacitor 14 can be a filter capacitor.

[0032] In some embodiments, preferably, the capacitor 14 adopts a double-star connection mode, and specifically, the double-star connection mode can divide the capacitor 14 into two star-shaped connection capacitor banks with equal or similar capacitances, when one of the capacitors 14 fails, the fault current is limited in a small range and does not affect the entire capacitor bank, thereby reducing the impact of the fault on the entire system.

[0033] In some embodiments, the capacitor system includes a vacuum circuit breaker 12 connected in series with a corresponding capacitor branch among a plurality of capacitor branches. The vacuum circuit breaker 12 is used for automatic switching. In some embodiments, the vacuum circuit breaker 12 switching the capacitor branch can prevent damage to the capacitor 14 from the system interruption current. Specifically, the capacitor branch can automatically perform switching operations according to the user's load conditions, thereby achieving dynamic adjustment of reactive power compensation and improving the system's power factor and operating efficiency. Compared with traditional sulfur hexafluoride circuit breakers, the vacuum circuit breaker 12 has significant environmental advantages. The vacuum circuit breaker 12 uses vacuum as the arc-extinguishing medium, completely avoiding the use of sulfur hexafluoride gas, thus eliminating the serious environmental pollution caused by sulfur hexafluoride gas leakage.

[0034] In some embodiments, such as Figure 3 As shown, a disconnecting switch 2 is provided on the incoming side of the capacitor bank. The incoming side is used to connect the wiring cable 5. The disconnecting switch 2 is grounded to provide a safe disconnection point during maintenance. In some embodiments, the incoming side is used to connect the user's incoming cable. By setting the disconnecting switch 2, the electrical connection between the capacitor bank and the user's incoming cable can be safely and effectively disconnected during maintenance, repair, or fault handling, ensuring the safety of workers and the stable operation of the entire power system. Specifically, after the grounding disconnecting switch 2 is closed, the residual charge of the capacitor 14 can be discharged, thereby ensuring the personal safety of maintenance personnel.

[0035] In some embodiments, each capacitor branch includes a first current transformer 10 and a second current transformer 15. The first current transformer 10 is installed at the inlet of the capacitor branch and is used to measure the current of the capacitor bank and provide a signal for the overcurrent protection device. In some embodiments, the first current transformer 10 is a bus current transformer, used to provide bus current measurement and protection signals. In some embodiments, the second current transformer 15 is installed at the outlet of the capacitor branch and is a neutral point unbalanced current transformer to provide unbalanced current signals in the event of an internal fault in the capacitor 14.

[0036] In some embodiments, each capacitor branch also includes a zinc oxide surge arrester 13, such as Figure 1 As shown, the surge arrester 13 can prevent the capacitor 14 from being affected by lightning overvoltage or vacuum circuit breaker 12 closing overvoltage.

[0037] In some embodiments, such as Figure 3 and Figure 9As shown, the capacitor system further comprises a capacitor bank control cabinet 3 arranged inside the standard container 1 and a control cabinet door 22 for opening and closing the control cabinet 3. The control cabinet 3 is provided with an automatic switching controller and a capacitor bank protection device, which further ensures the efficient and stable operation of the power system and provides a solid guarantee for the safety of the equipment.

[0038] In embodiments of the present application, preferably, as Figure 2 As shown, the fence 16 is equipped with a fence net door 20 for daily maintenance work. The fence net door 20 is provided with an electromagnetic lock and a travel switch, which are electrically interlocked with the vacuum circuit breaker 12 in the standard container 1, ensuring that the vacuum circuit breaker 12 cannot be closed for power transmission when the fence net door 20 is open, effectively preventing the risk of live operation; at the same time, it also ensures that the fence net door 20 cannot be opened at will in the case of live air-core reactor 17 inside the fence 16, thereby enhancing the safety and reliability of the overall system. Figure 2 As shown in the middle, the fence net door 20 is arranged on the upper part of the side wall of the fence 16. Those skilled in the art can arrange the fence net door 20 at any other suitable position according to actual needs.

[0039] In some embodiments, the fence 16 is detachably connected with the standard container 1, used to cover the air-core reactor 17 arranged outside the standard container 1, and forms an electrical interlock with the capacitor bank arranged inside the standard container 1.

[0040] In some embodiments, the standard container 1 is configured as a 20-foot high cube (HC) with a single capacitor branch. In other embodiments, the standard container 1 is configured as a 40-foot high cube with 2 capacitor branches. The 40-foot provides double the space of the 20-foot, allowing for more cargo or equipment to be loaded. This is more advantageous for applications that require more space.

[0041] In embodiments of the present application, multi-voltage levels refer to the simultaneous presence of multiple devices and facilities of different voltage levels in the capacitor system, and the coordinated operation between different voltage levels is achieved through reasonable division and connection. Specifically, the multi-voltage levels in the capacitor system generally cover the range of 6.6KV to 33KV. In actual applications, the multi-voltage level system can select the appropriate voltage level for power transmission and distribution according to different application scenarios and needs. In addition, the multi-voltage level capacitor system can also dynamically adjust the input or removal of the capacitor bank according to the user's load through the automatic switching function, further optimizing the power factor.

[0042] In some embodiments, as Figure 2 and Figure 9As shown, mounting holes 21 are pre-drilled on the side wall of the standard container 1 as needed. The number of mounting holes 21 can be determined according to the number of through-wall bushings 9. In some embodiments, when the standard container 1 is configured to have a single capacitor branch, preferably, the number of mounting holes 21 is set to 6; when the standard container 1 is configured to have 2 capacitor branches, preferably, the number of mounting holes 21 is set to 12. The mounting holes 21 are used to install and fix the through-wall bushings 9. The through-wall bushings 9 are not installed during transportation to maintain the external dimensions of the standard container 1 for easy transport. The locations where the mounting holes 21 are made are waterproof and sealed to prevent rainwater intrusion during transportation. Upon arrival at the site, the user can remove the sealing material and install the through-wall bushings 9 through the mounting holes 21. The air-core reactor 17 is connected to the through-wall bushings 9 via steel-cored aluminum stranded wire 18. The design of this utility model not only facilitates transportation but also meets the electrical connection requirements of the capacitor system after installation. At the same time, the waterproof sealing measures improve the protection level of the standard container, ensuring the reliable operation of the capacitor system in outdoor environments.

[0043] In some embodiments, a clamp 11 for connecting to a steel-cored aluminum stranded wire 18 is provided on the through-wall sleeve 9 located outside the standard container 1. The steel-cored aluminum stranded wire 18 can be cut to length according to the actual needs of the user at the site, and then fastened using a special clamp 11 (e.g., Figures 4-7 As shown), it is simple and quick, thus greatly simplifying and reducing the workload at the user's site. In some embodiments, such as Figure 1 As shown, the busbar 4 is fixed and the live parts are isolated by the insulator 6 set on the top of the standard container 1, so that the live parts are insulated from the standard container 1, thus ensuring the safety of the system.

[0044] In some embodiments, such as Figure 4 As shown, the through-wall bushing 9 is connected to the first current transformer 10 via a branch connection line 8. In other embodiments, such as... Figure 6 As shown, insulator 6 is connected to the first current transformer 10 via branch connection line 8.

[0045] According to other embodiments of the present invention, the steel-cored aluminum stranded wire 18 can also be replaced by other types of conductors known in the art, such as copper-cored aluminum stranded wire.

[0046] In some embodiments, see Figures 8-9 The front and rear views of a standard container 1 according to an embodiment of the present invention are shown. An intake fan is provided at the lower part of one side wall of the standard container 1, and an exhaust fan is provided at the upper part of the opposite side wall. This layout effectively enhances the air circulation rate inside the standard container 1 by optimizing the air flow path and prevents the capacitor system from being damaged due to overheating.

[0047] In some embodiments, preferably, the air intake fan and the air exhaust fan are respectively provided with a detachable air intake fan cover 23 and an air exhaust fan cover 24. During the operation of the capacitor bank, the air intake fan cover 23 and the air exhaust fan cover 24 can protect the air intake fan and the air exhaust fan from rainwater, improve the protection level of the standard container 1, and make the standard container 1 reach the IP54 or even IP55 standard.

[0048] In some embodiments, preferably, referring to Figure 10 the left view of the standard container 1 according to an embodiment of the present application, the number of the air exhaust fans is 2, the number of the air intake fans on the opposite side is also 2, and the corresponding air intake fan cover 23 and the air exhaust fan cover 24 are respectively 2. During transportation, the air intake fan cover 23 and the air exhaust fan cover 24 are removed, so that the influence of the covers on the external dimensions of the standard container can be avoided, the standard container can still be transported according to the international marine standard container, and the transportation cost is reduced.

[0049] In some embodiments, the top and the side of the standard container 1 are provided with thermal insulation cotton, which can effectively insulate the transmission of external heat. When the standard container 1 is placed outdoors, especially in the sun, the thermal insulation cotton can significantly reduce the rapid rise of the temperature in the standard container 1. Because the thermal insulation cotton has a low thermal conductivity, it can reduce the conduction of heat through the shell of the standard container 1 to the inside. In addition, the thermal insulation cotton can also prevent the condensate water caused by the large temperature difference in the standard container, and can also ensure that the temperature in the standard container is lower than the extreme low temperature and higher than the extreme high temperature under the extreme low temperature condition and the extreme high temperature condition, thereby further protecting the capacitor system in the standard container 1.

[0050] In some embodiments, as Figure 3 shown, the outside of the top of the standard container 1 is provided with a slope 7, which facilitates the rapid drainage of rainwater, thereby avoiding the corrosion problem caused by water accumulation and prolonging the service life of the standard container 1.

[0051] The utility model also provides a standard container, as Figures 8-10 shown, the standard container comprises the capacitor system as described above, wherein the capacitor bank of the capacitor system is installed in the inside of the standard container 1, and the air core reactor 17 of the capacitor system is stacked on the outside of the standard container 1. The standard container 1 can be transported according to the international marine standard container, and the transportation cost is low.

[0052] In some embodiments, as Figure 9As shown, the standard container 1 further comprises a standard container external grounding terminal 25 and a standard container internal grounding terminal 26, so that the entire standard container 1 and the capacitor system inside the standard container 1 form a complete grounding system, effectively reducing the grounding resistance, improving the reliability of the grounding system, and ensuring personal and equipment safety. Specifically, the number of different grounding terminals is preferably 2, and the two grounding terminals are arranged to facilitate separate detection and maintenance of the grounding state of the outside and inside of the standard container 1, ensuring normal operation of the grounding system.

[0053] Those skilled in the art can understand that the capacitor system of the utility model can also be applied to non-standard containers. The utility model sets the capacitor bank in the standard container 1 and stacks the air-core reactor 17 outside the standard container 1, so that the capacitor system can support capacitor banks of multiple voltage levels and achieve the dual functions of limiting the inrush current and suppressing harmonics of the air-core reactor 17, effectively protecting the safety of the power grid; by setting the fence 16 and the capacitor bank inside the standard container 1, electrical interlocking is achieved, and the internal and external electrical connections of the capacitor bank and the air-core reactor 17 are achieved. The utility model effectively solves the problem that when installing a capacitor bank above 10KV in the existing standard container 1, only a small volume current-limiting reactor can be used, and the power grid harmonics cannot be suppressed.

[0054] The capacitor system for a standard container and the standard container comprising the capacitor system of the utility model can be applied in traditional industries, new energy, power transmission and distribution, and energy storage industries.

[0055] Although the utility model has been described by the preferred embodiments, the utility model is not limited to the embodiments described herein, and includes various changes and variations made without departing from the scope of the utility model.

Claims

1. A capacitor system for a standard shipping container, characterized in that, include: A capacitor bank, configured to be installed within the standard container; An air-core reactor is configured to be stacked outside the standard container and electrically connected to the capacitor bank; A fence is provided to cover the air-core reactor and form an electrical interlock with the capacitor bank.

2. The capacitor system according to claim 1, characterized in that, The air-core reactor is electrically connected to the capacitor bank via a through-wall bushing.

3. The capacitor system according to claim 1, characterized in that, The capacitor bank includes multiple capacitor branches, and each capacitor branch includes multiple capacitors.

4. The capacitor system according to claim 3, characterized in that, It also includes a vacuum circuit breaker, which is connected in series with a corresponding capacitor branch of the plurality of capacitor branches.

5. The capacitor system according to claim 3, characterized in that, The capacitor is connected in a double star configuration.

6. The capacitor system according to claim 3, characterized in that, Each capacitor branch includes a first current transformer and a second current transformer, the first current transformer being installed at the inlet of the capacitor branch and the second current transformer being installed at the outlet of the capacitor branch.

7. The capacitor system according to claim 1, characterized in that, The capacitor bank is equipped with an isolating switch on its input side.

8. A standard shipping container, characterized in that, Includes the capacitor system according to any one of claims 1-7.

9. The standard container according to claim 8, characterized in that, An intake fan is provided on the lower part of one side wall of the standard container, and an exhaust fan is provided on the upper part of the other side wall opposite to the intake fan. The intake fan and the exhaust fan are respectively equipped with a detachable intake fan cover and an exhaust fan cover.

10. The standard container according to claim 8 or 9, characterized in that, The standard container has a ramp on the outside of its top.

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