Combined electric appliance and flexible direct current system starting loop

Abstract

The utility model provides a combined electric appliance and a flexible direct current system starting loop, and the combined electric appliance comprises a sealed cavity, a bus, a voltage transformer, a lightning arrester, a first circuit breaker, and a starting resistor. An insulating medium with the insulating strength larger than preset strength is arranged in the sealed cavity, the bus, the voltage transformer, the lightning arrester and the first circuit breaker are arranged in the sealed cavity, the voltage transformer and the lightning arrester are connected to the first end of the bus in parallel, and the first circuit breaker is connected between the second end and the third end of the bus in series. The starting resistor is arranged outside the sealing cavity; the first end, the second end and the third end of the bus respectively extend out of the sealed cavity, the first end of the starting resistor is connected with the second end of the bus, and the second end of the starting resistor is connected with the third end of the bus. According to the combined electric appliance and the flexible direct current system starting loop, all the devices are arranged in an integrated mode, the occupied area is reduced, and the wiring structure is simplified.

Description

Technical Field

[0001] The present disclosure relates to the technical field of flexible DC system starting circuits, and in particular to a combination electrical appliance and a flexible DC system starting circuit. Background Art

[0002] The flexible DC system is a high-voltage DC transmission system based on voltage source converters, self-switching devices and pulse width modulation. The traditional flexible DC system starting circuit solution is to arrange each device independently, which not only occupies a large area, but also has complex wiring, making the overall layout difficult and costly. At the same time, air is used for insulation between each device, and the insulation performance is easily affected by environmental factors such as altitude, temperature, and humidity. Therefore, in different environments, different safety clearances are required between each device, which further increases the difficulty of the overall layout. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, an object of the present disclosure is to provide a combination appliance and a flexible DC system starting circuit.

[0005] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides a combined electrical appliance, comprising: a sealed chamber, a busbar, a voltage transformer, a lightning arrester, a first circuit breaker and a starting resistor; wherein, an insulating medium with an insulation strength greater than a preset strength is arranged in the sealed chamber, and the busbar, the voltage transformer, the lightning arrester and the first circuit breaker are respectively arranged in the sealed chamber, the voltage transformer and the lightning arrester are respectively connected in parallel to the first end of the busbar, the first circuit breaker is connected in series between the second end and the third end of the busbar, and the starting resistor is arranged outside the sealed chamber; the first end, the second end and the third end of the busbar respectively extend out of the sealed chamber, and the first end of the starting resistor is connected to the second end of the busbar, and the second end of the starting resistor is connected to the third end of the busbar.

[0006] Optionally, the sealed chamber includes: a first channel, a second channel and a third channel; wherein the second end of the first channel is respectively connected to the first end of the second channel and the first end of the third channel, and the first channel and the third channel are respectively arranged along a first direction, and the second channel is arranged along a second direction, and the first direction and the second direction are at a first preset angle; the voltage transformer and the lightning arrester are respectively arranged in the first channel, and the first circuit breaker is arranged in the third channel, and the starting resistor is located between the second channel and the third channel; the first end of the busbar extends out of the first end of the first channel, and the second end of the busbar extends out of the second end of the second channel, and the third end of the busbar extends out of the second end of the third channel.

[0007] Optionally, the sealed chamber also includes: a first sleeve, a second sleeve and a third sleeve; wherein the first sleeve, the second sleeve and the third sleeve are respectively arranged along a third direction, and the first direction and the third direction form a second preset angle, and the second direction and the third direction form a third preset angle; the second end of the first sleeve is connected to the first end of the first channel, and the second end of the second sleeve is connected to the second end of the second channel, and the second end of the third sleeve is connected to the second end of the third channel; the first end of the busbar extends out of the first end of the first sleeve, and the second end of the busbar extends out of the first end of the second sleeve, and the third end of the busbar extends out of the first end of the third sleeve.

[0008] Optionally, the combined electrical appliance further includes: a second circuit breaker, which is disposed in the first channel and connected in series between the first end and the second end of the busbar.

[0009] Optionally, the combination electrical appliance further includes: a first grounding switch, which is arranged in the first channel and connected in parallel to the first end of the second circuit breaker; and / or a second grounding switch, which is arranged in the first channel and connected in parallel to the second end of the second circuit breaker.

[0010] Optionally, the combined electrical appliance further includes: a first isolating switch, which is disposed in the first channel and is connected in series between the first end and the second end of the busbar.

[0011] Optionally, the combined electrical appliance further includes: a third grounding switch, which is disposed in the first channel and connected in parallel to the second end of the first isolating switch.

[0012] Optionally, the combined electrical appliance further includes: a current transformer, which is disposed in the second channel and is connected in series between the second end and the first and third ends of the busbar.

[0013] Optionally, the combined electrical appliance further includes: a second isolating switch, which is disposed in the second channel and is connected in series between the second end and the first and third ends of the busbar.

[0014] A second aspect of the present disclosure provides a flexible DC system starting circuit, comprising: a combined electrical appliance as provided in the first aspect of the present disclosure.

[0015] The technical solution provided by the present disclosure may have the following beneficial effects:

[0016] Since the voltage transformer, lightning arrester and first circuit breaker are respectively arranged in the sealed chamber and connected in parallel or in series by busbar, the various devices of the starting circuit in the flexible DC system are integrated, which not only reduces the footprint, but also simplifies the wiring structure, greatly reducing the overall layout difficulty and cost; moreover, since an insulating medium with an insulation strength greater than a preset strength is provided in the sealed chamber, the insulation performance between the various devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the various devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0017] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a structural schematic diagram of a combined electrical appliance proposed in an embodiment of the present disclosure;

[0020] Figure 2 is a schematic diagram of a partial structure along a first direction in a combined electrical appliance provided in an embodiment of the present disclosure;

[0021] Figure 3 is a schematic diagram of a partial structure along a second direction in a combined electrical appliance provided in an embodiment of the present disclosure;

[0022] Figure 4 is a circuit diagram of a combined electrical appliance proposed in an embodiment of the present disclosure;

[0023] As shown in the figure: 1, sealed chamber, 11, first channel, 12, second channel, 13, third channel, 14, first sleeve, 15, second sleeve, 16, third sleeve;

[0024] 2. Busbar;

[0025] PT, voltage transformer, LA, lightning arrester, R, starting resistor, CT, current transformer;

[0026] CB1, first circuit breaker, CB2, second circuit breaker;

[0027] ES1, a first grounding switch, ES2, a second grounding switch, ES3, a third grounding switch;

[0028] DS1, the first isolating switch; DS2, the second isolating switch. DETAILED DESCRIPTION

[0029] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0030] like Figure 1 , Figure 2 and Figure 4 As shown, an embodiment of the present disclosure proposes a combined electrical appliance, comprising: a sealed chamber 1, a busbar 2, a voltage transformer PT, a lightning arrester LA, a first circuit breaker CB1 and a starting resistor R; wherein, an insulating medium with an insulation strength greater than a preset strength is arranged in the sealed chamber 1, and the busbar 2, the voltage transformer PT, the lightning arrester LA and the first circuit breaker CB1 are respectively arranged in the sealed chamber 1, the voltage transformer PT and the lightning arrester LA are respectively connected in parallel to the first end of the busbar 2, the first circuit breaker CB1 is connected in series between the second end and the third end of the busbar 2, the starting resistor R is arranged outside the sealed chamber 1, the first end, the second end and the third end of the busbar 2 respectively extend out of the sealed chamber 1, and the first end of the starting resistor R is connected to the second end of the busbar 2, and the second end of the starting resistor R is connected to the third end of the busbar 2.

[0031] It can be understood that, since the first circuit breaker CB1 is connected in series between the second end and the third end of the bus 2, and the first end of the starting resistor R is connected to the second end of the bus 2, and the second end of the starting resistor R is connected to the third end of the bus 2, the first circuit breaker CB1 and the starting resistor R form a parallel structure and constitute the main part of the starting circuit of the flexible DC system. At the same time, since the voltage transformer PT and the lightning arrester LA are respectively connected in parallel to the first end of the bus 2, the voltage transformer PT and the lightning arrester LA constitute the protection part of the starting circuit of the flexible DC system. Therefore, the normal operation of the flexible DC system is guaranteed by the cooperation of the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and the starting resistor R.

[0032] At the same time, since the voltage transformer PT, the lightning arrester LA and the first circuit breaker CB1 are respectively arranged in the sealed chamber 1, and the busbar 2 is used to realize parallel or series connection, the various devices of the starting circuit in the flexible DC system are integrated, which not only reduces the footprint, but also simplifies the wiring structure, and greatly reduces the overall layout difficulty and layout cost; moreover, since an insulating medium with an insulation strength greater than a preset strength is provided in the sealed chamber 1, the insulation performance between the various devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the various devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0033] It should be noted that the sealed chamber 1 is a chamber structure with sealing performance such as air tightness and liquid tightness exceeding the set value. The sealed chamber 1 is used to accommodate the bus 2, the voltage transformer PT, the lightning arrester LA and the first circuit breaker CB1. Since the starting resistor R is large in volume, the starting resistor R is arranged outside the sealed chamber 1. The specific type of the sealed chamber 1 can be set according to actual needs and is not limited to this. For example, the sealed chamber 1 may include a plurality of independent sealed shells, and the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1, etc. are respectively located in independent sealed shells, and the plurality of sealed shells are connected in sequence, thereby forming a split structure of the sealed chamber 1; the sealed chamber 1 may be a sealed shell, and the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1, etc. are respectively located in the sealed shell, thereby forming an integral structure of the sealed chamber 1.

[0034] The busbar 2 is used for parallel and series connection between the devices in the sealed chamber 1 such as the voltage transformer PT, the lightning arrester LA, and the first circuit breaker CB1, and the first end, the second end, and the third end of the busbar 2 extend out of the sealed chamber 1 and are connected to other devices such as the starting resistor R. The specific type of the busbar 2 can be set according to actual needs and is not limited. Among them, the first end of the busbar 2 can be used as the input end of the combined electrical appliance, and the third end of the busbar 2 can be used as the output end of the combined electrical appliance. Specifically, the first end of the busbar 2 can be connected to the output end of the converter transformer in the flexible direct current system, and the third end of the busbar 2 can be connected to the input end of the bridge arm reactor.

[0035] The voltage transformer PT is similar to a transformer and is a device used to transform voltage. The purpose of the voltage transformer PT to transform voltage is mainly to measure the voltage, power and electric energy of the bus 2, or to protect other devices in the bus 2 when a fault occurs in the bus 2. The specific type of the voltage transformer PT can be set according to actual needs and is not limited to this. Among them, the voltage transformer PT described in this embodiment refers to the primary side of the voltage transformer PT, that is, the primary side of the voltage transformer PT is connected in parallel to the first end of the bus 2.

[0036] The lightning arrester LA is a device used to protect electrical equipment from high transient overvoltage hazards and limit the follow-through time and often also limit the follow-through amplitude. The specific type of the lightning arrester LA can be set according to actual needs and there is no restriction on this.

[0037] The first circuit breaker CB1 is a circuit breaker, which refers to a switching device that can close, carry and disconnect current under normal circuit conditions and can close, carry and disconnect current under abnormal circuit conditions within a specified time. The specific type of the first circuit breaker CB1 can be set according to actual needs and is not limited to this.

[0038] The specific type of the starting resistor R can be set according to actual needs and is not limited thereto.

[0039] Among them, for devices such as voltage transformer PT and lightning arrester LA connected in parallel to bus 2, their first ends are connected to bus 2 and their second ends are grounded. In addition, the grounding method can be to use the same wire to lead out to the outside of the sealed chamber 1 for centralized grounding, or to be connected separately to the grounding area of ​​the sealed chamber 1.

[0040] The insulating medium is used for insulation isolation between the devices in the sealed chamber 1 such as the voltage transformer PT, the lightning arrester LA, and the first circuit breaker CB1. The specific type of the insulating medium can be set according to actual needs, and there is no restriction on this. For example, the insulating medium can be sulfur hexafluoride (SF6) gas, and the insulation strength of sulfur hexafluoride is about 2.5 times that of air. Among them, during normal operation, except for the three ports of the busbar 2, the combined electrical body is not energized. When arranging the scheme, it is only necessary to consider the overall installation and maintenance space, without considering the clearance required for personal and equipment safety.

[0041] The combined electrical appliance of this embodiment belongs to HGIS (Hybrid Gas Insulated Switchgear, high-voltage switchgear), which can be applied to flexible direct current systems with the starting circuit arranged on the converter valve side; can be applied to projects where the converter station in the flexible direct current system has limited land occupation and it is inconvenient to requisition land; can be applied to flexible direct current transmission projects in onshore or offshore wind power projects that are affected by geological conditions or environmental conditions and do not occupy too much land; can be applied to projects where the production of air-insulated equipment is difficult due to climate restrictions. Among them, the use of the combined electrical appliance of this embodiment is not limited to a specific region, power system scale or usage scenario, and has a wide range of applications and is not limited by factors such as terrain or climate.

[0042] like Figure 1 , Figure 2 and Figure 3As shown, in some embodiments, the sealed chamber 1 includes: a first channel 11, a second channel 12 and a third channel 13; wherein the second end of the first channel 11 is respectively connected to the first end of the second channel 12 and the first end of the third channel 13, and the first channel 11 and the third channel 13 are respectively arranged along the first direction, the second channel 12 is arranged along the second direction, the first direction and the second direction are at a first preset angle, the voltage transformer PT and the lightning arrester LA are respectively arranged in the first channel 11, and the first circuit breaker CB1 is arranged in the third channel 13, the starting resistor R is located between the second channel 12 and the third channel 13, the first end of the busbar 2 extends out of the first end of the first channel 11, the second end of the busbar 2 extends out of the second end of the second channel 12, and the third end of the busbar 2 extends out of the second end of the third channel 13.

[0043] It can be understood that since the second end of the first channel 11 is connected to the first end of the second channel 12 and the first end of the third channel 13 respectively, and the first channel 11 and the third channel 13 are respectively arranged along the first direction, and the second channel 12 is arranged along the second direction, the sealed chamber 1 forms an overall structure close to a "T" shape, and since the voltage transformer PT and the lightning arrester LA are respectively arranged in the first channel 11, and the first circuit breaker CB1 is arranged in the third channel 13, the starting resistor R is located between the second channel 12 and the third channel 13, the overall layout of the combined electrical appliance is more compact and occupies a smaller area, so that it is easy to arrange the overall structure.

[0044] It should be noted that the first channel 11, the second channel 12 and the third channel 13 constitute a sealed chamber 1 that is close to a "T" shape. The specific types of the first channel 11, the second channel 12 and the third channel 13 can be set according to actual needs and are not limited to this. For example, the first channel 11, the second channel 12 and the third channel 13 can all be sealed tube structures.

[0045] The arrangement of the voltage transformer PT in the first channel 11 can be set according to actual needs and is not limited to this. For example, a sealed channel arranged along an "L" shape extends from the first channel 11, and the voltage transformer PT is arranged in the sealed channel along the third direction.

[0046] The arrangement of the lightning arrester LA in the first channel 11 can be set according to actual needs and is not limited to this. For example, a sealed channel arranged along an "L" shape extends from the first channel 11, and the lightning arrester LA is arranged in the sealed channel along the third direction.

[0047] The arrangement of the first circuit breaker CB1 in the third channel 13 can be set according to actual needs, and there is no limitation on this. For example, a sealed channel arranged along a "U" shape extends from the third channel 13, and the first circuit breaker CB1 is arranged in the sealed channel along the first direction.

[0048] The arrangement of the starting resistor R outside the sealed chamber 1 can be set according to actual needs and is not limited to this. For example, the starting resistor R can be set between the second channel 12 and the third channel 13 along the first direction, between the second channel 12 and the third channel 13 along the second direction, or between the second channel 12 and the third channel 13 along other directions.

[0049] The specific settings of the first direction, the second direction and the third direction can be set according to actual needs without limitation. For example, the first direction and the second direction are both located in the horizontal plane, and the third direction is located in the vertical direction. Specifically, the first preset angle, the second preset angle and the third preset angle are all 90 degrees.

[0050] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the sealed chamber 1 further includes: a first sleeve 14, a second sleeve 15 and a third sleeve 16; wherein the first sleeve 14, the second sleeve 15 and the third sleeve 16 are respectively arranged along the third direction, and the first direction and the third direction are at a second preset angle, the second direction and the third direction are at a third preset angle, the second end of the first sleeve 14 is connected to the first end of the first channel 11, and the second end of the second sleeve 15 is connected to the second end of the second channel 12, the second end of the third sleeve 16 is connected to the second end of the third channel 13, the first end of the busbar 2 extends out of the first end of the first sleeve 14, and the second end of the busbar 2 extends out of the first end of the second sleeve 15, and the third end of the busbar 2 extends out of the first end of the third sleeve 16.

[0051] It can be understood that since the second end of the first bushing 14 is connected to the first end of the first channel 11, and the first end of the busbar 2 extends out of the first end of the first bushing 14, the first end of the busbar 2 can be connected to an external device using the first bushing 14; since the second end of the second bushing 15 is connected to the second end of the second channel 12, and the second end of the busbar 2 extends out of the first end of the second bushing 15, the second end of the busbar 2 can be connected to an external device using the second bushing 15; since the second end of the third bushing 16 is connected to the second end of the third channel 13, and the third end of the busbar 2 extends out of the first end of the third bushing 16, the third end of the busbar 2 can be connected to an external device using the third bushing 16.

[0052] Among them, since the first sleeve 14, the second sleeve 15 and the third sleeve 16 are respectively arranged along the third direction, the combination appliance uses the first sleeve 14, the second sleeve 15 and the third sleeve 16 to connect with external devices without occupying the area in the first direction and the second direction, thereby facilitating the overall installation layout.

[0053] It should be noted that the specific types of the first bushing 14, the second bushing 15 and the third bushing 16 can be set according to actual needs and are not limited to this. For example, the first bushing 14, the second bushing 15 and the third bushing 16 can all be sealed tube structures, and the first bushing 14, the second bushing 15 and the third bushing 16 are respectively supported on the ground by a stand, the first end of the busbar 2 extends out of the first end of the first bushing 14 and forms an exposed wiring structure, the second end of the busbar 2 extends out of the first end of the second bushing 15 and forms an exposed wiring structure, and the third end of the busbar 2 extends out of the first end of the third bushing 16 and forms an exposed wiring structure.

[0054] Among them, the first bushing 14, the second bushing 15 and the third bushing 16 are significantly smaller in size compared to the independent device layout, and the number of exposed live parts of the combined electrical appliance is small and the volume is small. When arranged in the flexible direct current system, only the safety clearance requirements of the three bushings need to be considered, which reduces the limiting factors and reduces the difficulty of layout.

[0055] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the combined electrical appliance further includes: a second circuit breaker CB2, which is disposed in the first channel 11 and connected in series between the first end and the second end of the busbar 2.

[0056] It can be understood that since the second circuit breaker CB2 is connected in series between the first end and the second end of the bus 2, the second circuit breaker CB2 can serve as a protection device for the starting circuit in the flexible DC system, and cooperate with the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices to ensure the normal operation of the flexible DC system.

[0057] At the same time, since the second circuit breaker CB2 is arranged in the first channel 11 and is connected in series between the first end and the second end of the busbar 2, the second circuit breaker CB2 and the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices are integrated, which not only reduces the footprint, but also simplifies the wiring structure, so that the overall layout difficulty and layout cost are greatly reduced; moreover, by using the insulating medium in the sealed chamber 1, the insulation performance between the second circuit breaker CB2 and other devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the second circuit breaker CB2 and other devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0058] It should be noted that the second circuit breaker CB2 is a circuit breaker, and the specific type of the second circuit breaker CB2 can be set according to actual needs and is not limited to this.

[0059] The arrangement of the second circuit breaker CB2 in the first channel 11 can be set according to actual needs, and there is no limitation on this. For example, a sealed channel arranged along a "U" shape extends from the first channel 11, and the second circuit breaker CB2 is arranged in the sealed channel along the first direction.

[0060] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the combination appliance further includes: a first grounding switch ES1 and / or a second grounding switch ES2, the first grounding switch ES1 is arranged in the first channel 11, and the first grounding switch ES1 is connected in parallel to the first end of the second circuit breaker CB2, the second grounding switch ES2 is arranged in the first channel 11, and the second grounding switch ES2 is connected in parallel to the second end of the second circuit breaker CB2.

[0061] It can be understood that since the first grounding switch ES1 is connected in parallel to the first end of the second circuit breaker CB2, the first grounding switch ES1 can serve as a protection device for the starting circuit of the flexible DC system, and cooperate with the second circuit breaker CB2, the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices to ensure the normal operation of the flexible DC system.

[0062] At the same time, since the first grounding switch ES1 is arranged in the first channel 11 and is connected in parallel to the first end of the second circuit breaker CB2, the first grounding switch ES1 and the second circuit breaker CB2, the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices are integrated, which not only reduces the floor space, but also simplifies the wiring structure, so that the overall layout difficulty and layout cost are greatly reduced; moreover, by using the insulating medium in the sealed chamber 1, the insulation performance between the first grounding switch ES1 and other devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the first grounding switch ES1 and other devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0063] Since the second grounding switch ES2 is connected in parallel to the first end of the second circuit breaker CB2, the second grounding switch ES2 can serve as a protection device for the starting circuit of the flexible DC system, and cooperate with the second circuit breaker CB2, the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices to ensure the normal operation of the flexible DC system.

[0064] At the same time, since the second grounding switch ES2 is arranged in the first channel 11 and is connected in parallel to the first end of the second circuit breaker CB2, the second grounding switch ES2 and the second circuit breaker CB2, the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices are integrated, which not only reduces the footprint, but also simplifies the wiring structure, so that the overall layout difficulty and layout cost are greatly reduced; moreover, by using the insulating medium in the sealed chamber 1, the insulation performance between the second grounding switch ES2 and other devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the second grounding switch ES2 and other devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0065] It should be noted that the first grounding switch ES1 and the second grounding switch ES2 are both grounding switches. The grounding switch refers to a mechanical grounding device that releases the static charge of the equipment and circuit under maintenance and ensures the personal safety of maintenance personnel during power outage maintenance. The specific types of the first grounding switch ES1 and the second grounding switch ES2 can be set according to actual needs and there is no restriction on this.

[0066] The arrangement of the first grounding switch ES1 in the first channel 11 can be set according to actual needs, and is not limited thereto. For example, the first grounding switch ES1 is arranged in the first channel 11 along the first direction.

[0067] The arrangement of the second grounding switch ES2 in the first channel 11 can be set according to actual needs, and is not limited thereto. For example, the second grounding switch ES2 is arranged in the first channel 11 along the first direction.

[0068] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the combined electrical appliance further includes: a first isolating switch DS1, which is disposed in the first channel 11 and is connected in series between the first end and the second end of the busbar 2.

[0069] It can be understood that since the first isolating switch DS1 is connected in series between the first end and the second end of the bus 2, the first isolating switch DS1 can serve as a protection device for the starting circuit in the flexible DC system, and cooperate with the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices to ensure the normal operation of the flexible DC system.

[0070] At the same time, since the first isolating switch DS1 is arranged in the first channel 11 and is connected in series between the first end and the second end of the busbar 2, the first isolating switch DS1 and devices such as the voltage transformer PT, the lightning arrester LA, and the first circuit breaker CB1 are integrated, which not only reduces the footprint, but also simplifies the wiring structure, thereby greatly reducing the overall layout difficulty and cost; moreover, by utilizing the insulating medium in the sealed chamber 1, the insulation performance between the first isolating switch DS1 and other devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the first isolating switch DS1 and other devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0071] It should be noted that the first isolating switch DS1 is an isolating switch, which is a switching device mainly used for "isolating power supply, switching operation, and connecting and disconnecting small current circuits" without arc extinguishing function. The specific type of the first isolating switch DS1 can be set according to actual needs and there is no restriction on this.

[0072] The arrangement of the first isolating switch DS1 in the first channel 11 can be set according to actual needs, and there is no limitation to this. For example, the first isolating switch DS1 is arranged in the first channel 11 along the first direction.

[0073] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the combined electrical appliance further includes: a third grounding switch ES3, the third grounding switch ES3 is disposed in the first channel 11, and the third grounding switch ES3 is connected in parallel to the second end of the first isolation switch DS1.

[0074] It can be understood that since the third grounding switch ES3 is connected in parallel to the second end of the first isolating switch DS1, the third grounding switch ES3 can serve as a protection device for the starting circuit of the flexible DC system, and cooperate with the first isolating switch DS1, the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices to ensure the normal operation of the flexible DC system.

[0075] At the same time, since the third grounding switch ES3 is arranged in the first channel 11 and is connected in parallel to the second end of the first isolating switch DS1, the third grounding switch ES3 and the first isolating switch DS1, the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices are integrated, which not only reduces the footprint, but also simplifies the wiring structure, thereby greatly reducing the overall layout difficulty and layout cost; moreover, by utilizing the insulating medium in the sealed chamber 1, the insulation performance between the third grounding switch ES3 and other devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the third grounding switch ES3 and other devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0076] It should be noted that the third grounding switch ES3 is a grounding switch, and the specific type of the third grounding switch ES3 can be set according to actual needs and is not limited to this.

[0077] The arrangement of the third grounding switch ES3 in the first channel 11 can be set according to actual needs, and there is no limitation to this. For example, the third grounding switch ES3 is arranged in the first channel 11 along the first direction.

[0078] like Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the combined electrical appliance further includes: a current transformer CT, which is disposed in the second channel 12 and is connected in series between the second end of the busbar 2 and the first and third ends.

[0079] It can be understood that since the current transformer CT is connected in series between the second end and the first and third ends of the bus 2, the current transformer CT can be used as a protection device for the starting circuit in the flexible DC system, and cooperate with the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices to ensure the normal operation of the flexible DC system.

[0080] At the same time, since the current transformer CT is arranged in the second channel 12 and is connected in series between the second end and the first end and the third end of the busbar 2, the current transformer CT and the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices are integrated, which not only reduces the footprint, but also simplifies the wiring structure, so that the overall layout difficulty and layout cost are greatly reduced; moreover, by using the insulating medium in the sealed chamber 1, the insulation performance between the current transformer CT and other devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the current transformer CT and other devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0081] It should be noted that the current transformer CT is a device that converts a large current on the primary side into a small current on the secondary side for measurement based on the principle of electromagnetic induction. The specific type of the current transformer CT can be set according to actual needs and is not limited to this. Among them, the current transformer CT described in this embodiment refers to the primary side of the current transformer CT, that is, the primary side of the current transformer CT is connected in series between the second end of the bus 2 and the first end and the third end.

[0082] The arrangement of the current transformer CT in the second channel 12 can be set according to actual needs and is not limited to this. For example, a sealed channel arranged along a "U" shape extends from the second channel 12, and the current transformer CT is arranged in the sealed channel along the second direction.

[0083] like Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the combined electrical appliance further includes: a second isolating switch DS2, which is disposed in the second channel 12, and is connected in series between the second end of the busbar 2 and the first and third ends.

[0084] It can be understood that since the second isolating switch DS2 is connected in series between the second end and the first end and the third end of the bus 2, the second isolating switch DS2 can serve as a protection device for the starting circuit in the flexible DC system, and cooperate with the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and other devices to ensure the normal operation of the flexible DC system.

[0085] At the same time, since the second isolating switch DS2 is arranged in the second channel 12 and is connected in series between the second end and the first end and the third end of the busbar 2, the second isolating switch DS2 and devices such as the voltage transformer PT, the lightning arrester LA, and the first circuit breaker CB1 are integrated, which not only reduces the footprint, but also simplifies the wiring structure, thereby greatly reducing the overall layout difficulty and layout cost; moreover, by utilizing the insulating medium in the sealed chamber 1, the insulation performance between the second isolating switch DS2 and other devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the second isolating switch DS2 and other devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0086] It should be noted that the second isolating switch DS2 is an isolating switch, and the specific type of the second isolating switch DS2 can be set according to actual needs and is not limited to this.

[0087] The arrangement of the second isolating switch DS2 in the second channel 12 can be set according to actual needs, and there is no limitation to this. For example, the second isolating switch DS2 is arranged in the second channel 12 along the second direction.

[0088] For example, Figure 4 As shown, in the combined electrical apparatus of this embodiment, the first end of the voltage transformer PT is connected to the external device through the busbar 2, the second end of the voltage transformer PT is grounded, the first end of the lightning arrester LA is connected to the first end of the voltage transformer PT, the second end of the lightning arrester LA is grounded, the first end of the first grounding switch ES1 is connected to the first end of the lightning arrester LA, the second end of the first grounding switch ES1 is grounded, the first end of the second circuit breaker CB2 is connected to the first end of the first grounding switch ES1, the first end of the second grounding switch ES2 is connected to the second end of the second circuit breaker CB2, the second end of the second grounding switch ES2 is grounded, and the first end of the first isolating switch DS1 is connected to the first end of the first grounding switch ES1. The first end of the third grounding switch ES3 is connected to the second end of the first isolating switch DS1, the second end of the third grounding switch ES3 is grounded, the first end of the first circuit breaker CB1 is connected to the first end of the third grounding switch ES3, the second end of the first circuit breaker CB1 is respectively connected to the first end of the starting resistor R and an external device through the bus 2, the first end of the second isolating switch DS2 is connected to the first end of the third grounding switch ES3, the first end of the current transformer CT is connected to the second end of the second isolating switch DS2, and the second end of the current transformer CT is connected to the second end of the starting resistor R through the bus 2.

[0089] Among them, each component in the combination electrical appliance can use existing molding equipment, thereby reducing the difficulty of research and development and production. At the same time, the components in the combination electrical appliance can be deleted or added accordingly according to engineering requirements to meet different personalized requirements.

[0090] The disclosed embodiment also provides a flexible DC system starting circuit, including: a combined electrical appliance as in the disclosed embodiment.

[0091] It can be understood that, since the first circuit breaker CB1 is connected in series between the second end and the third end of the bus 2, and the first end of the starting resistor R is connected to the second end of the bus 2, and the second end of the starting resistor R is connected to the third end of the bus 2, the first circuit breaker CB1 and the starting resistor R form a parallel structure and constitute the main part of the starting circuit of the flexible DC system. At the same time, since the voltage transformer PT and the lightning arrester LA are respectively connected in parallel to the first end of the bus 2, the voltage transformer PT and the lightning arrester LA constitute the protection part of the starting circuit of the flexible DC system. Therefore, the normal operation of the flexible DC system is guaranteed by the cooperation of the voltage transformer PT, the lightning arrester LA, the first circuit breaker CB1 and the starting resistor R.

[0092] At the same time, since the voltage transformer PT, the lightning arrester LA and the first circuit breaker CB1 are respectively arranged in the sealed chamber 1, and the busbar 2 is used to realize parallel or series connection, the various devices of the starting circuit in the flexible DC system are integrated, which not only reduces the footprint, but also simplifies the wiring structure, and greatly reduces the overall layout difficulty and layout cost; moreover, since an insulating medium with an insulation strength greater than a preset strength is provided in the sealed chamber 1, the insulation performance between the various devices is not easily affected by the external environment, which not only improves the overall insulation performance, but also avoids adjusting the safety clearance between the various devices according to environmental changes, thereby further reducing the overall layout difficulty.

[0093] It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0094] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0095] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0096] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A combination electrical appliance, characterized in that: include: Sealed chamber, busbar, voltage transformer, lightning arrester, first circuit breaker and starting resistor; Wherein, an insulating medium with an insulation strength greater than a preset strength is arranged in the sealed chamber, and the busbar, the voltage transformer, the lightning arrester and the first circuit breaker are respectively arranged in the sealed chamber, the voltage transformer and the lightning arrester are respectively connected in parallel to the first end of the busbar, the first circuit breaker is connected in series between the second end and the third end of the busbar, and the starting resistor is arranged outside the sealed chamber; The first end, the second end and the third end of the busbar extend out of the sealed chamber respectively, and the first end of the starting resistor is connected to the second end of the busbar, and the second end of the starting resistor is connected to the third end of the busbar.

2. The combined electrical appliance according to claim 1, characterized in that: The sealed chamber comprises: Channel 1, Channel 2, and Channel 3; The second end of the first channel is connected to the first end of the second channel and the first end of the third channel respectively, and the first channel and the third channel are respectively arranged along a first direction, and the second channel is arranged along a second direction, and the first direction and the second direction form a first preset angle; The voltage transformer and the lightning arrester are respectively arranged in the first channel, and the first circuit breaker is arranged in the third channel, and the starting resistor is located between the second channel and the third channel; The first end of the busbar extends out of the first end of the first channel, the second end of the busbar extends out of the second end of the second channel, and the third end of the busbar extends out of the second end of the third channel.

3. The combined electrical appliance according to claim 2, characterized in that: The sealed chamber also includes: A first sleeve, a second sleeve, and a third sleeve; Wherein, the first sleeve, the second sleeve and the third sleeve are respectively arranged along a third direction, and the first direction and the third direction form a second preset angle, and the second direction and the third direction form a third preset angle; The second end of the first sleeve is in communication with the first end of the first channel, the second end of the second sleeve is in communication with the second end of the second channel, and the second end of the third sleeve is in communication with the second end of the third channel; The first end of the busbar extends out of the first end of the first bushing, the second end of the busbar extends out of the first end of the second bushing, and the third end of the busbar extends out of the first end of the third bushing.

4. The combined electrical appliance according to claim 2, characterized in that: The combined electrical appliance further comprises: A second circuit breaker is disposed in the first channel and is connected in series between the first end and the second end of the busbar.

5. The combined electrical appliance according to claim 4, characterized in that: The combined electrical appliance further comprises: a first grounding switch, wherein the first grounding switch is disposed in the first channel and connected in parallel to a first end of the second circuit breaker; and / or A second grounding switch is disposed in the first channel and is connected in parallel to the second end of the second circuit breaker.

6. The combined electrical appliance according to claim 2, characterized in that: The combined electrical appliance further comprises: A first isolating switch is disposed in the first channel and is connected in series between the first end and the second end of the busbar.

7. The combined electrical appliance according to claim 6, characterized in that: The combined electrical appliance further comprises: A third grounding switch is disposed in the first channel and is connected in parallel to the second end of the first isolating switch.

8. The combined electrical appliance according to claim 2, characterized in that: The combined electrical appliance further comprises: A current transformer is arranged in the second channel and is connected in series between the second end and the first end and the third end of the busbar.

9. The combined electrical appliance according to claim 2, characterized in that: The combined electrical appliance further comprises: A second isolating switch is disposed in the second channel and is connected in series between the second end of the bus bar and the first end and the third end.

10. A flexible DC system starting circuit, characterized in that: include: The combined electrical appliance according to any one of claims 1 to 9.

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