CN111968829A

CN111968829A - Containing component, electrical system and method of operation

Info

Publication number: CN111968829A
Application number: CN202010987942.9A
Authority: CN
Inventors: S·布罗德; M·维克斯滕; G·斯特隆伯格; J·R·蒂勒里; J·约翰逊
Original assignee: ABB Grid Switzerland AG
Current assignee: Hitachi Energy Co ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2020-11-20

Abstract

In at least one embodiment, the containment component (1) is configured to be connected to an electrical assembly (2) to contain an electrical line (3) and to be filled with a liquid (4). The receiving part (1) comprises an electrically conductive material and has an open mounting side (51) to be connected to the electrical component (2). The surface area to volume ratio of the containing part (1) is at least 3m^‑1And the ratio of the volume of the containment member (1) to the wall-breaking pressure (r) is at least 0.02m³MPa^‑1. Operating the corresponding electrical system (100) such that capacity is maintainedWhen an arc (8) occurs in the receiving part (1), the receiving part (1) absorbs the pressure rise (7) which is conducted into the module case (6).

Description

Containing component, electrical system and method of operation

Technical Field

The present disclosure provides a containment component for an electrical system and such an electrical system. Furthermore, an operating method for such an electrical system is provided.

Background

Documents US 7,317,598B 2, US 7,902,590B 2 and EP 1166297B 1 relate to rupture discs for transformers.

Disclosure of Invention

The object to be achieved is to provide a containment component which can withstand the pressure caused by the arc occurring therein.

This object is achieved in particular by a containment component, an electrical system and a method of operation as described in the independent claims. Exemplary further developments form the subject matter of the dependent claims.

For example, the containment component is filled with transformer oil and mechanically strengthened in the following manner: before the pressure rise due to the arc can lead to a destruction or significant leakage of the receiving part, it is absorbed and guided into the larger assembly into which it is deflected by the receiving part. Accordingly, damage to the accommodating member and to surrounding equipment, for example, due to fire caused by damage or leakage of the accommodating member, can be prevented.

In at least one embodiment, the receiving component is configured to be connected to an electrical component, such as a transformer or a shunt reactor, and is configured to receive an electrical line. Further, the receiving member is configured to be filled with a liquid, wherein the receiving member comprises a conductive material. The receiving part has an open mounting side to be connected to the electrical component. The surface area to volume ratio of the containment member is at least 3m^-1And the ratio of the volume of the accommodating member to the wall-breaking pressure is at least 0.02m³MPa^-1。

The accommodating member is, for example, a turntable to be mounted on a transformer or a shunt reactor. The liquid may be transformer oil configured to provide more efficient cooling than air.

The electrically conductive material may be at least one metal, for example steel, such as stainless steel.

The open mounting side is, for example, the bottom side of a cylinder forming the receiving part. Thus, at the open mounting side, the receiving part comprises a hole, such that the mounting side is for example at least 60% or 80% or 90% free of any solid material. The remaining area of the mounting side may be formed of a material to be placed on the electrical component on which the receiving part is mounted.

The open mounting side may be flat such that the receiving part may be placed on a flat surface of the electrical component. Additionally, the open mounting side may include structure for improving connectivity with electrical components. Such structures may be formed, for example, by indentations, by adapters, or by mating rings.

The surface area to volume ratio of the containment component is relatively large. Thus, the surface area to volume ratio may be at least 3m^-1Or at least 4m^-1Or at least 5m^-1. Alternatively, the surface area to volume ratio may be at most 9m^-1Or at most 10m^-1Or at most 11m^-1. The surface area of the receiving part relevant for determining the surface area to volume ratio may be the inner surface area of the receiving part excluding the area of the opening in the mounting side, or the relevant surface area may also be the outer surface area of the receiving part, again without taking into account the area of the opening in the mounting side.

For example, if the receiving part has the shape of a hollow cylinder, the relevant surface area is the area of the cylinder barrel plus the area of the top side of the cylinder, assuming that the bottom side of the cylinder is completely open. When the cylinder has a height H and a radius R, then in this case the relevant surface area is 2 π RH + π R². In another example, the receiving part has the shape of a cuboid with a height H, a width W and a length K, and the relevant surface area is 2H (L + K) + KL, also assuming that the bottom side of the cuboid is completely open.

Further assuming that the wall thickness of the containment component is small compared to the diameter of the containment component, it should be noted that the outer and inner surface areas of the containment component are approximately equal. "smaller" may mean that there is a multiple of at least 50 times or 100 times between the wall thickness and the diameter. If the containment features are not circular, the diameter may be calculated as the square root of the area of the containment features in the plane divided by pi.

The ratio of the volume of the containment member to the wall-breaking pressure may be at least 0.01m³MPa^-1Or at least 0.02m³MPa^-1Or at least 0.04m³MPa^-1Or may also be at least 0.05m³MPa^-1. Optionally, the failure pressure is at most 2m³MPa^-1Or at most 1m³MPa^-1Or at most 0.4m³MPa^-1Or at most 0.3m³MPa^-1. That is, the receiving member has high mechanical strength to resist damage due to internal pressure.

With the above values, on the one hand a sufficiently strong accommodation of the components can be achieved, while on the other hand the mechanical loading of the electrical assembly and the manufacturing costs can be kept relatively low and a high manageability can be achieved. Thus, for example, the surface area to volume ratio may be in the range of 3m^-1And 9m^-1Between (including 3m)^-1And 9m^-1) And the ratio of the volume of the containing part to the wall breaking pressure may be 0.04m³MPa^-1And 2m³MPa^-1Between (containing 0.04 m)³MPa^-1And 2m³MPa^-1). For example, for a straight turntable, this value may be 0.04m³MPa^-1And 0.6m³MPa^-1Between (containing 0.04 m)³MPa^-1And 0.6m³MPa^-1) (ii) a For an external turret or side turret, this value may be 0.4m³MPa^-1And 1.5m³MPa^-1In the middle (containing 0.4 m)³MPa^-1And 1.5m³MPa^-1) (ii) a And for cable boxes this value may be in the range of 0.1m³MPa^-1And 1m³MPa^-1Between (containing 0.1 m)³MPa^-1And 1m³MPa^-1) To ensure both sufficient mechanical strength and manageability.

The failure pressure may be the internal pressure of the containment component at which the outer shell of the containment device begins to crack and begins to chip and fracture. The breaking pressure can be calculated, for example, by means of a finite element method (FEM for short), or can also be measured.

Thus, the receiving part may be a reinforced turntable for the electrical apparatus.

High energy internal arcs in oil filled turntables can produce very sudden pressure rises due to the small volume of the turntable, and damage can be accompanied by a large amount of oil leakage and fire. Containment components (such as the oil-filled reinforced turret described herein) are designed to resist such large pressure rises without damage and significant oil leakage. The turret design is modified to thicker turret shells, flanges and stronger bolted connections, such as steel or stainless steel. The pressure rise is then transferred to an electrical component, such as a transformer main tank, which is configured to absorb the injected energy by elastic-plastic deformation. It should be noted that the internal tank pressure in the electrical assembly is much lower due to the large volume of the internal tank. This safety feature may prevent damage and fire to the turntable.

In addition, this enhanced design solution can be applied to other oil-filled cubicles, such as cable terminations, cable boxes, and side turntables (e.g., vent chimneys). This design can also be applied to on-load tap changer covers (OLTC covers for short) and to the connection to the transformer tank.

In the case of internal arcs, the transformer turret, cable terminations and cable boxes, in which there are bushing ends and/or bushing shields, are the second largest cause of fire. The arc peak pressure rise in such a small oil volume can be as high as 10 times compared to the same event located in the main transformer tank.

One might think that a pressure relief valve might be a solution, but several studies have shown that such a valve is not effective because of its relatively slow reaction time and small diameter. Other alternatives would be to avoid transformer designs, cable terminations and cable boxes with oil-filled turntables, or to use large open pressure relief devices at the top cover of the transformer. However, these alternatives may be accompanied by the occurrence of reduced breakdown voltage or by the occurrence of increased risk of oil leakage.

The containment components described herein are intended to resist certain internal arc energies and associated pressures. Thicker turntable housings and flanges may provide better mechanical resistance to withstand damage. Larger bolt sizes (including higher tightening torques) and thicker turret flanges may prevent potential oil leakage. All of these design variations may be the result of calculations and the result of nonlinear finite element analysis. The specific internal arc energy is, for example, 20MJ or 30 MJ.

Once the pressure is contained in the turntable, the pressure will be transmitted to the transformer main tank. The tank will deform to absorb this additional arc gas volume. The tank displacement and resistance can be ensured by nonlinear finite element analysis.

As an example, the following variant is performed for a straight turret with a diameter of 930 mm:

the thickness of the turntable housing increases from 5mm to 8mm, wherein the use of stainless steel may also be effective,

the turntable flange and the tank cover flange increase in thickness from 18mm to 50mm,

the thickness of the turntable cover increases from 28mm to 50mm,

the turret bolt size increased from M12 to M36,

the bolt tightening torque increases from 84Nm to 2400 Nm.

The turntable may also be equipped with a pressure relief valve. The shape of the valve may be straight or may be curved or chimney-shaped. The same principle can also be applied to other oil-filled compartments, such as cable terminations and cable boxes.

The containment components and design principles described herein may be applied, for example, to:

-a single-phase distribution transformer, which,

-a medium-sized distribution transformer configured for 315kVA up to 2499kVA,

-a low voltage variable speed drive transformer configured for a secondary voltage of at most 1.0kV,

-an industrial transformer, to which a power supply is connected,

-a housing transformer, which is,

-a vacuum or a conventional OLTC,

-a large to medium distribution transformer configured for exceeding 2499kVA,

-a small distribution transformer configured for up to 315kVA,

-a small-sized power transformer, comprising,

-a high voltage direct current transformer, and/or

-a reactor such as a shunt reactor.

According to at least one embodiment, the accommodating member is a turn table configured to be added to a transformer or a shunt reactor as the electric device. Thus, the electrical line may be a high power line or a high voltage line configured to be applied with a voltage of, for example, at least 16kV or a voltage of at least 100 kV.

Further, an electrical system is provided. The electrical system comprises a receiving member as shown in connection with at least one of the above embodiments. Thus, features of the electrical system for housing the components are also disclosed, and vice versa.

In at least one embodiment, an electrical system includes one or more containment components. By means of the at least one receiving part, the electrical system can be provided with one power line or with a plurality of power lines. The electrical system further comprises an electrical component, such as a transformer or a shunt reactor, having at least one component enclosure. The at least one receiving part is mounted to the assembly box through the open mounting side such that the interior of the assembly box is connected with the interior of the at least one receiving part at the corresponding open mounting side. The volume of the module case exceeds the volume of the containing part by at least 3 times, or by at least 10 times, or by at least 100 times.

According to at least one embodiment, the receiving part comprises a top side opposite to the open mounting side. For example, the top side comprises at least one hole such that at least one electrical line received by the receiving part is fed through the at least one hole.

According to at least one embodiment, the receiving part comprises a side wall. The side wall connects the top side and the open mounting side. The side wall may be one piece or multiple pieces. Optionally, the top side is thicker than the side walls.

According to at least one embodiment, the side walls and/or the top surface are made of a metal having a modulus of elasticity of at least 150GPa or at least 190GPa at room temperature. For example, the top surface and/or the side walls are made of steel or stainless steel.

According to at least one embodiment, the wall thickness of the side wall is at least 5mm or at least 6mm or at least 7 mm. Optionally, the wall thickness is at most 20mm or at most 14mm or at most 10 mm.

According to at least one embodiment, the side wall is constituted by at least two elements, for example by two elements or by three elements. These elements may have the same or different designs.

According to at least one embodiment the side wall elements are connected by means of an intermediate flange along the side wall between the top side and the open mounting side. Thus, in the case of two elements, each of the side wall elements may comprise one intermediate flange; in the case of three or more elements, at least one of the middle parts comprises two middle flanges and two end elements each comprise one middle flange.

According to at least one embodiment, the intermediate flange mechanically reinforces the sidewall. The intermediate flange may thus be a reinforcing ring thickening the side wall in the respective position. For example, the wall thickness of the side wall is increased at the intermediate flange by at least a factor of 3 and/or at most a factor of 7 compared to the remaining area of the side wall without any flange or the like.

According to at least one embodiment, the electrical line received by the receiving part is connected to a bushing of the electrical assembly. The electrical line can be electrically connected to a cable or an electrical line of the electrical assembly, for example, to an internal power line, by means of the bushing.

According to at least one embodiment, the bushings and/or the internal power lines of the electrical components protrude from the component magazine. The sleeve and/or the internal power line may terminate within the containment component. Thus, the receiving part may also receive the sleeve.

According to at least one embodiment, the cannula comprises a shield. The end of the electrical line fed through the containment component is retained by the shroud. Optionally, said end of the electrical line and an end of the internal electrical line of the electrical assembly are held and/or coupled and/or connected by means of the shroud and/or by means of the bushing.

According to at least one embodiment, the intermediate flange or at least one of the intermediate flanges extends around the sleeve, the shield and/or the cable on the outer surface of the side wall. Thus, the intermediate flange may provide mechanical reinforcement at or near the location where arcing is most likely to occur.

According to at least one embodiment, the diameter and/or length of the containment part is at least 0.3m or at least 0.7m or at least 1 m. Optionally, said diameter and/or said length of the containment means is at most 10m or at most 7m or at most 3 m. The length may be determined in a direction perpendicular to the opened mounting side. The diameter may be determined in a plane parallel to the open mounting side.

According to at least one embodiment, the minimum distance between the side wall of the containment part and the electrical lines and/or assembly internal lines and/or bushings and/or shields contained in the containment part is at least 0.1m or at least 0.2m or at least 0.3 m. Alternatively or additionally, the distance is at most 0.5m or 0.4m or 0.3 m. For example, the distance is between 0.2m and 0.3m (including 0.2m and 0.3 m). The diameter of the receiving part is therefore relatively large in order to reduce the risk of internal arcing. This distance can be completely filled with liquid before the arc occurs.

According to at least one embodiment, the volume of the module case is at least 12m³Or at least 15m³Or at least 25m³. Optionally, the volume is at most 220m³Or 170m at the maximum³Or a maximum of 100m³. The volume may be the entire volume enclosed by the module case. Thus, the actual volume of liquid filling the module tank can be small. For example, the volume of the liquid in the module case is at least 3m³Or at least 10m³Or at least 20m³And/or at most 80m³Or at most 40m³。

According to at least one embodiment, the liquid filling the containing part and also filling the assembly tank is transformer oil. The transformer oil may be a silicon-based oil or a mineral oil.

According to at least one embodiment, the receiving part further comprises at least one bottom flange. One or more bottom flanges may surround the open mounting side. Similar to the middle flange, the bottom flange may be a thickened portion of the side wall that is endmost of the side wall on the open mounting side. The receiving member may be mounted to the assembly box by means of a bottom flange.

According to at least one embodiment, the receiving part further comprises at least one top flange. One or more top flanges may be located at a side of the side wall distal from the open mounting side, i.e., the side wall proximate the top side.

According to at least one embodiment, the at least one cover of the receiving part forms a top side. Thus, the one or more cover and the top side may comprise at least one cover flange. The at least one cover is secured to the sidewall by at least one top flange and at least one cover flange. Similar to the middle and bottom flanges, the top flange may be a thickened portion of the sidewall that is located at the extreme end of the sidewall at the top side.

According to at least one embodiment, the ratio of the thickness of the intermediate flange to the wall thickness of the side wall is at least 4 or at least 5. Alternatively or additionally, the ratio is at most 15 or at most 10. Thus, in order to avoid leakage of liquid at the intermediate flange, the flange is designed to be relatively strong. The same applies to the ratio of the thickness of the top flange to the wall thickness of the side wall and/or to the ratio of the thickness of the cover flange to the wall thickness of the side wall and/or to the ratio of the thickness of the bottom flange to the wall thickness of the side wall.

According to at least one embodiment, the cover comprises at least one through opening through which the electrical lines are fed into the receiving part. The through opening in the cover thus corresponds to the hole of the top side.

According to at least one embodiment, at least one of the intermediate flanges, at least one of the bottom flange and the assembly box, and at least one of the top flange and the cover flange are connected together with a fastening torque flange of at least 0.5kNm or at least 1kNm or at least 2 kNm. Optionally, the tightening torque is at most 3kNm or at most 5 kNm. Therefore, the bolts connecting the respective flanges are applied with a torque of a relatively high moment.

Further, an operating method for an electrical system is provided. The electrical system is designed as shown in connection with at least one of the embodiments described above. Thus, features of the electrical system and features of the containment component are also disclosed with respect to the method of operation, and vice versa.

In at least one embodiment, a method of operation for an electrical system comprises:

when an arc occurs in the containing part, the containing part absorbs the pressure rise due to the arc,

the pressure rise is conducted from the receiving component into the module case via the open installation side, wherein the receiving component is subjected to the pressure rise during the time required for the pressure rise to be deflected into the module case without being destroyed, and

upon receipt of the pressure rise, the component box deforms and contains the pressure rise such that no damage or significant damage occurs to the electrical components and the containing parts.

Thus, oil leakage and resulting fire can be prevented.

According to at least one embodiment of the method, the travel time of the pressure rise within the containment part from the position of the arc to the open mounting side is less than the total build-up time of the pressure rise and/or the arc. For example, the maximum pressure and/or volume expansion and/or complete arc is established at least 20ms or at least 35ms after the start of the arc. However, the travel time required for the pressure rise in the liquid to reach the open mounting side is at most 20ms or at most 10 ms. Thus, the pressure rise is partially released to the larger module case before it can exert its destructive effect sufficiently in the accommodating member having a relatively small volume.

According to at least one embodiment of the method, the arc occurs at or near the bushing and/or the shield. For example, the distance between the current-carrying part fed through the receiving part and the side wall of the receiving part is minimal near the bushing and/or the shield.

Drawings

The containment components, electrical systems, and methods of operation described herein are described in more detail by way of exemplary embodiments with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. However, the relationships between elements are not shown to scale, but various elements may be shown exaggerated to aid understanding. The attached drawings are as follows:

FIG. 1 is a schematic side view of an exemplary embodiment of an electrical system described herein;

FIG. 2 is a schematic cross-sectional view of the electrical system of FIG. 1;

FIG. 3 is a detail of a schematic cross-sectional view of the electrical system of FIG. 2;

FIG. 4 is a schematic perspective view of a containment component of the electrical system of FIG. 1;

FIG. 5 is a schematic cross-sectional view of the containment component of FIG. 4;

FIG. 6 is a schematic perspective view of an exemplary embodiment of an electrical system described herein;

FIG. 7 is a schematic cross-sectional view of an exemplary embodiment of a containment component described herein;

fig. 8-10 are schematic side views of exemplary embodiments of electrical systems described herein; and

fig. 11 and 12 are schematic diagrams of the time-to-pressure dependence in the containing member.

Detailed Description

Fig. 1 to 5 show an exemplary embodiment of an electrical system 100, which electrical system 100 comprises an exemplary embodiment of a receiving part 1. The electrical system 100 further comprises an electrical component 2, such as a transformer 21 or, alternatively, a shunt reactor. The electric line 3 is supplied to the electric device 2 through the accommodating member 1. Thus, the accommodating member 1 may be a top turntable 11 mounted on the electrical component 2.

Referring to fig. 2, the electrical component 2 includes a component case 6, and a base member 62 is located in the component case 6. The component base element 62 includes, for example, a transformer winding and a transformer core. Furthermore, the electrical component 2 comprises an internal line 61, by means of which internal line 61 an electrical current is fed to the component base element 62. For example, the component internal wiring 61 is a high power wiring and is configured to carry a high voltage. The assembly tank 6 as well as the containing part 1 is filled with a liquid 4, for example transformer oil.

As can be seen from fig. 2 and 3, the electrical line 3 is connected to the module internal line 61, for example by means of a bushing 27. At the end 31 of the electrical line 3, there is optionally a shield 28 of the sleeve 27, which clamps the electrical line 3. The shield 28 may be located at the middle or approximately the middle of the accommodating member 1, as viewed in a direction perpendicular to the open mounting 51 side of the accommodating member 1. For example, the electrical line 3 comprises a conductive core 33 and an electrical insulator 32 extending around the core 33 up to the end 31.

Referring to fig. 3, in the region of the end 31, the distance between the sleeve 27 of the shield 28, which is configured to carry current on the one hand, and the electrically conductive receiving part 1 on the other hand is relatively small. Therefore, in this region, the possibility that the arc 8 may occur is highest. Thus, the arc 8 may occur in a relatively narrow region of the containing member 1 and also within a relatively small volume defined by the containing member 1.

Due to the arc 8, the liquid 4 breaks down in the region of the arc 8 and a rapid pressure rise 7 occurs in a small volume in the receiving part 1, while comparing the following fig. 11 and 12. By means of the mechanically relatively large receiving part 1, the pressure rise 7 is deflected into a much larger volume of the module case 6. Therefore, the pressure rise 7 can be absorbed in the module case 6, and damage to the electrical system 100 caused by, for example, a fire due to the liquid 4 and gas overflowing from the accommodating member 1 can be prevented.

Thus, the receiving part 1 is constructed in a mechanically stable manner, see fig. 4 and 5. However, care must be taken to ensure that the containing part 1 is not too large in terms of its mechanical properties, in order to avoid excessive mechanical loads on the assembly box 6 and in order to keep the costs relatively low.

In this exemplary embodiment, the accommodating member 1 substantially has the shape of a hollow cylinder. The mounting side 51 of the receiving part 1 facing the module case 6 is substantially open, so that the diameter of the opening at the mounting side 51 corresponds to the inner diameter of the hollow cylinder. Therefore, the opening at the mounting side 51 is as large as possible.

The top side 52 of the receiving part 1 may be formed by a cover 57. Optionally, on top of the cover 57 there are further elements of the containing part 1 for mounting the electrical lines 3. Thus, a through opening 59 is defined at the top side 52 by means of further elements.

The top side 52 and the open mounting side 51 are connected by a side wall 53. Optionally, the side wall 53 is of multi-piece design, such that the side wall 53 is made up of two elements 50. The elements 50 may have the same design or may have different shapes. For example, the elements 50 of the side wall 53 are

tubes having flanges

54, 55, 56 at their respective ends.

Thus, at the open mounting side 51 there is a bottom flange 55, at the interface between the elements 50 of the side wall 53 there are two intermediate flanges 54, and at the top side 52 there is a top flange 56 of the topmost element 50 of the side wall 53 and a covering flange 58 of a cover 57. All the

flanges

54, 55, 56, 58 may be integral with the respective elements 50, 57 and may constitute a ring or edge at the end of the tube of the element 50 forming the side wall 53. The

flanges

54, 55, 56, 58 may be connected by means of bolts 91 and by means of O-rings 92 between each of the element 50, the cover 57 and the assembly box 6. The O-ring 92 may be rubber or metal.

Optionally, the intermediate flange 54 is located close to the end 31 of the electrical line 3 and therefore near the shield 58 of the sleeve 57. Thus, the intermediate flange 54 may serve as a mechanical reinforcement of the side wall 53. Furthermore, the possible arcing positions are relatively close to the open installation side 51, so that the pressure rise 7 can be conducted into the larger component box 6 in a short period of time.

The liquid 4 may fill, for example, 60% to 75% of the total internal volume of the containment component 1, with the remaining space within the containment component 1 being occupied by the electrical lines 3, the sleeve 27 and the assembly internal lines 62. The same applies to the module case 6 in connection with the module internal wiring 61 and the module base element 62.

Optionally, the following parameters (for example, with a tolerance of in each case a maximum of 1.5 times or a maximum of 1.3 times or a maximum of 1.1 times) are applied to the receiving part 1 individually or in any combination:

the wall thickness of the tube of the element 50 constituting the side wall 52 is 8 mm.

The element 50 of the side wall 53 and the cover 57 are made of a material having a young's modulus of 200GPa, for example steel or stainless steel.

The thickness of the

flanges

54, 55, 56 and/or 58 and thus of the cover 57 is 50 mm. For example, the

flanges

54, 55, 56, 58 may be in accordance with ANSI B16.47 grade 150, or in accordance with a similar grade.

Bolt 91 is an M36 bolt, for example, according to ISO 898 grade 8.8.

The tightening torque to the bolt 91 is 2400 Nm.

The diameter (e.g. inner diameter) of the elements 50 of the side wall 53 is 930 mm.

The length of the containing part 1 (e.g. comprising the cover 57 but not comprising further elements on top of the cover 57) is 2.3 m.

Thus, the containing member 1 may have about 4.7m^-1And the ratio of the volume of the containment member 1 to the wall-breaking pressure r may be about 0.17m³MPa^-1。

Alternatively, the valve 44 may also be present, for example, at the side wall 53 of the containing part 1. However, such pressure relief valves 44 are typically too slow to allow timely release of the pressure rise 7 caused by the arc 8

In fig. 6, another exemplary embodiment of the system 100 is shown. The electrical component 2 is, for example, a shunt reactor 22, but may also be a transformer 21, not shown.

At the top side of the module case 6 are a plurality of receiving parts 1. For example, there are three top turrets 11, each equipped with one electrical line 3. Furthermore, in addition to the top turntable 11 or instead of the top turntable 11, there may be a cable box 13 as a further accommodating member 1.

Otherwise, the description for fig. 1 to 5 also applies to fig. 6.

In fig. 7, an exemplary embodiment of the accommodating member 1 configured as the cable box 13 is shown. The cable box 13 may be rectangular parallelepiped or approximately rectangular parallelepiped in shape and may have an open mounting side 51 and a closed top side 52 and closed side walls 53. Optionally, there are a plurality of electrical insulators 32 andan electrical line 3. For example, the surface area to volume ratio of the cable box 13 is 2.4m^-1And the ratio of the volume of the cable box 13 to the wall-breaking pressure r is 1.1m³MPa^-1。

Such a cable box 13 may be present in all exemplary embodiments of the electrical system 100.

Otherwise, the description for fig. 1 to 6 also applies to fig. 7.

Fig. 8 to 10 schematically show further exemplary embodiments of an electrical system 100 comprising an exemplary receiving member 1.

According to fig. 8, the accommodating member 1 is configured as a side turn table 12 at a side wall of the module case 6. For example, such a side turntable 12 may be present in all exemplary embodiments of the electrical system 100 in addition to the top turntable 11 or instead of the top turntable 11.

Otherwise, the description for fig. 1 to 7 applies equally to fig. 8.

According to fig. 9, the accommodating member 1 is configured as a cable termination 15. For example, the cable termination 15 is located within the component enclosure 6, but may alternatively be located at a side wall or at the top of the component enclosure 6. Such cable terminations 15 may be present in all exemplary embodiments of the electrical system 100. Otherwise, the description for fig. 1 to 8 also applies to fig. 9.

According to fig. 10, the receiving part 1 is configured as an on-load tap changer 14. For example, on-load tap changer 14 is located at the top of assembly box 6. Such an on-load tap changer 14 may be present in all exemplary embodiments of the electrical system 100. Otherwise, the description for fig. 1 to 9 also applies to fig. 10.

As in all other exemplary embodiments, the top side 52 and the side wall 53 may be merged into a single surface of the receiving part. Alternatively, as shown in fig. 10, the top side 52 and the side wall 53 may be made together as a dome, e.g. as a hollow hemisphere.

In fig. 11 and 12, an exemplary pressure rise 7 is characterized. As shown in fig. 11, the pressure rise 7 and associated arc may be established on a time scale of about 40 ms. Thus, in a closed fixed volume, the maximum pressure will not occur before 40ms after the arc has been initiated. In other words, in the volume of a separate turntable without attached tanks, the maximum pressure in the turntable will occur after 40 ms. However, the duration will also depend on the actual arc duration.

As can be seen from fig. 12, the pressure P in the containing member 7 rises rapidly and reaches a maximum on a time scale of 5ms to 10ms, and then falls. This relatively rapid drop is caused by the pressure being released into the module case 6 through the open mounting side 51.

The pressure rise 7 in fig. 12 is caused by the arcs with energies of 20MJ and 30MJ, respectively. Additionally, such high energy arcs that rise rapidly beyond, for example, 15MJ energy can be very disruptive in high voltage applications.

Based on the turntable 11 of fig. 4 and 5, the accommodating member 1 has a wall-breaking pressure r of 9 MPa. However, in the case of high-energy arcs above 30MJ, a small and short-term leakage of the liquid 4 in the region of the

flanges

54, 55, 56, 58 can occur with a low leakage pressure 1 and a total of 4.6 MPa.

Accordingly, the containment component 1 in the electrical system 100 described herein may withstand high energy arcs.

The invention described herein is not limited by the description given with reference to the exemplary embodiments. Rather, the invention encompasses any novel feature and any combination of features, including in particular any combination of features in the claims, even if this feature or this combination itself is not explicitly indicated in the claims or exemplary embodiments.

List of reference numerals

1 accommodating member

11 Top revolving stage

12 side rotating table

13 Cable box

14 on-load tap-changer

15 Cable termination

2 electric assembly

21 transformer

22 parallel reactor

27 casing tube

28 casing shield

3 electric circuit

31 end of electric line

32 electrical insulator

33 conductive core

4 liquid

44 valve

50 elements of the containing part

51 open mounting side

52 top side

53 side wall

54 intermediate flange

55 bottom flange

56 top flange

57 cover

58 overlay member flange

59 lead through the opening

6 component box

61 Module internal circuitry

62 assembly foundation element

7 pressure rise

8 arc

91 bolt

92O-ring

100 electrical system

D diameter of the receiving part

Pressure of leakage

Length of L-shaped accommodating member

Pressure P

R wall breaking pressure

time t

Claims

1. A receiving part (1) for receiving a container,

the receiving part is configured to be connected to an electrical component (2),

the accommodating member is configured to accommodate an electric line (3), and

the containment means being configured to be filled with a liquid (4),

wherein the receiving part (1) comprises an electrically conductive material,

wherein the receiving part (1) has an open mounting side (51) to be connected to the electrical component (2),

wherein the surface area to volume ratio of the containment part (1) is at least 3m^-1And is and

wherein the ratio of the volume of the containment part (1) to the wall-breaking pressure (r) is at least 0.02m³MPa^-1。

2. The containment part (1) according to claim 1,

the housing part is formed as a turntable (11) and is configured to be added to a transformer (21) as an electrical device (2) or a shunt reactor (22) as an electrical device.

3. An electrical system (100) is provided,

the electrical system comprising a containment component (1) according to any one of the preceding claims, and

the electrical system comprises an electrical assembly (10) with an assembly box (6),

wherein the receiving part (1) is mounted to the assembly box (6) by the open mounting side (51) such that the interior of the assembly box (6) is connected to the interior of the receiving part (1) at the open mounting side (51), and

wherein the volume of the module case (6) exceeds the volume of the accommodating member (1) by at least 3 times.

4. The electrical system (100) of claim 3,

wherein the receiving part (1) comprises a top side (52) opposite to the open mounting side (51) and side walls (53) connecting the top side (52) and the open mounting side (51),

wherein the side wall (53) is made of a metal having an elastic modulus of at least 150GPa at room temperature, and

wherein the wall thickness of the side wall (53) is at least 6 mm.

5. The electrical system (100) of claim 4,

wherein the side wall (53) is formed by at least two elements (50), the elements (50) being connected by means of at least two intermediate flanges (54) positioned along the side wall (53) between the top side (52) and the open mounting side (51), and

wherein the intermediate flange (54) mechanically reinforces the side wall (53).

6. The electrical system (100) of any of claims 3 to 5,

wherein the electrical component (2) is a high-power transformer (21) or a shunt reactor (22),

wherein the housing part (1) houses the electrical line (3) which is connected to a bushing (27) of the electrical component (2).

7. Electrical system (100) according to the preceding claim,

wherein the sleeve (27) protrudes out of the assembly box (6) and terminates in the receiving part (1).

8. The electrical system (100) of claims 5 and 7,

wherein the sleeve (27) comprises a shield (28) which grips an end (31) of the electrical line (3),

wherein at least one of the intermediate flanges (54) extends around at least one of the sleeve (27) and the shroud (28) on an outer surface of the sidewall (53).

9. The electrical system (100) of any of claims 3 to 8,

wherein the diameter (D) and the length (L) of the containment part (1) are between 0.3m and 7m and comprise 0.3m and 0.7m,

wherein the volume of the component box (6) is 12m³And 170m³And includes 12m³And 170m³And is and

wherein the liquid (4) filling the containing part (1) and the assembly tank (6) is transformer oil.

10. The electrical system (100) of any of claims 3 to 9,

wherein the receiving part (1) further comprises a bottom flange (55) surrounding the open mounting side (51),

wherein the receiving part (1) is mounted to the assembly box (6) by means of the bottom flange (55).

11. The electrical system (100) of any of claims 3 to 10,

wherein the receiving part (1) further comprises a top flange (56) on the side of the side wall (53) remote from the open mounting side (51),

wherein a cover (57) of the receiving part (1) forming the top side (52) comprises a cover flange (58),

wherein the cover (57) is fixed to the side wall (53) by means of the top flange (56) and the cover flange (58),

wherein the cover (57) comprises a through opening (59) through which the electrical line (3) is fed into the receiving part (1).

12. The electrical system (100) of any of claims 5, 8, 10 and 11,

wherein at least one of the following is flanged together with a fastening torque of at least 1 kNm:

-the intermediate flange (54),

-the bottom flange (55) and the module case (6), and

-the top flange (56) and the cover flange (58), and

wherein at least one of the following is at least 5:

-the ratio of the thickness of the intermediate flange (54) to the wall thickness of the side wall (53),

-the ratio of the thickness of the top flange (56) to the wall thickness of the side wall (53),

-the ratio of the thickness of the bottom flange (55) to the wall thickness of the side wall (53), and

-the ratio of the thickness of the cover flange (58) to the wall thickness of the side wall (53).

13. A method of operation for an electrical system (100) according to any one of claims 3 to 12,

wherein, when an arc (8) occurs in the receiving part (1), the receiving part (1) absorbs a pressure rise (7) caused by the arc (8), and the pressure rise (7) is conducted from the receiving part (1) into the module case (6) via the open installation side (51), and

upon receiving the pressure rise (7), the component case (6) deforms and contains the pressure rise (7).

14. The method according to the preceding claim,

wherein the travel time of the pressure rise (7) from the arc (8) to the open mounting side (51) within the containment part (1) is less than the entire build-up time of the pressure rise (7).

15. Method according to claim 13 or 14, by which method the electrical assembly (10) according to claim 8 is operated,

wherein the arc (8) occurs at the bushing (27), the shield (28) and/or the cable (61).