AU2021107158A4 - Sealed dry-type transformer - Google Patents

Abstract

The present application discloses a dry-type transformer enclosed by a sealed vessel, wherein a transformer is mounted in the vessel, so that key components are completely isolated from an external environment. The vessel is composed of a thermal conductive assembly with multiple support structures, which can effectively radiate the heat generated by the internal electrical structure. The sealed dry-type transformer provided by the present application may be applied to all application scenarios of conventional oil-immersed transformers and dry-type transformers and is lower in shutdown fault rate, longer in service life and completely maintenance-free. /2113 12111A Fig. 1 -4 A-A D Fig. 2 1/5

Description

/2113 12111A

Fig. 1

D

-4 A-A

Fig. 2 1/5

SEALED DRY-TYPE TRANSFORMER TECHNICAL FIELD

The present application relates to power distribution transformer, in particular to a hermetically sealed dry-type transformer.

BACKGROUND OF THE PRESENT INVENTION

Generally, transformers may be divided into oil-immersed transformers and dry-type transformers according to insulating medium. Transformers for long-distance and high-capacity power transmission generally adopt the oil-immersed transformers due to high voltage and high capacity. However, in downstream power distribution networks, both the oil-immersed transformers and the dry-type transformers are utilized due to low voltage and capacity.

In some general power supply occasions, such as villages and communities, where there are ample footprint and reduced fire requirements, the oil-immersed transformers are usually selected; however, in some occasions of such as buildings, basements, critical infrastructure or ships, where there are insufficient installation footprint, or explosive environments, or high level of fire safety requirements, dry-type transformers are the only option.

For an existing dry-type transformer, air is used as an insulating and thermal conductive medium, key components, such as an iron core and a coil, of the existing dry-type transformer are exposed to natural air; thus the dry-type transformer is extremely easily affected by humidity, condensation, pollutants, dust, salt and other environmental factors. Therefore, the dry-type transformer installation requires a high environmental class and as such is generally mounted indoors only. At present, these problems have been solved by adopting additional air filtering and cooling method, such as forced air cooling and circulating water cooling, in some special applications, by which the cost is generally relatively high, and a cooling device, such as a fan or a water pump, is prone to failure which can result in overheating leading to loss of life and ultimately failure of the transformer.

Reference to any prior art in the specification is not, and should not be taken as, an acknowledgment or any form of suggestion that this prior art forms part of the common general knowledge in Australia or any other jurisdiction or that this prior art could reasonably be expected to be understood and regarded as relevant by a person skilled in the art.

SUMMARY OF THE PRESENT INVENTION

In order to overcome defects existing in the related art, the present application provides a sealed dry-type transformer which is provided with a sealed vessel, wherein a transformer is mounted in a vessel, so that key components, such as transformer active part, are completely isolated from an external environment.

The present application provides a sealed dry-type transformer, comprising a transformer and a vessel mounted outside the transformer, wherein the vessel is of a sealed structure and is filled with an insulating and thermal conductive medium;

the vessel comprises a top cover, a base and thermal conductive assemblies connected between the top cover and the base; and

the thermal conductive assemblies are provided with thermal conductive structures.

In some embodiments, support structures are arranged around the base of the vessel and are perpendicular to a plane where the base is located, and the support structures connects the base and the top cover; and

the thermal conductive assemblies are arranged between two adjacent of the support structures.

In some embodiments, each of the thermal conductive assemblies comprises a thermal conductive element; sealing strips are arranged around the thermal conductive element; fixed plates for mounting are arranged at two sides of the thermal conductive element; the fixed plates for mounting are connected with the support structures so that the thermal conductive element is fixedly mounted among the support structures; and due to the arrangement of the sealing strips around the thermal conductive element, the thermal conductive elements, the support structures, the top cover and the base form the vessel which is of the sealed structure.

In some embodiments, each of the support structures comprises a main body extending in a vertical direction as well as a first mounting part and a second mounting part which are connected with the main body and extends in the vertical direction, and the first mounting part and the second mounting part are respectively connected with the adjacent thermal conductive assemblies.

In some embodiments, the first mounting part and the second mounting part are respectively connected with the fixed plates for mounting of the thermal conductive assemblies adjacent to two sides of the housing frame.

In some embodiments, the thermal conductive element is of a multi-sheet corrugated structure, that is, the thermal conductive element comprises layers of thermal conductive element, and both thermal conductive elements are corrugated or profiled sheets.

In some embodiments, the sealed dry-type transformer further comprising one or more pressure relief elements and one or more arc light discharge sensors.

In some embodiments, the transformer is mounted inside the vessel, footings are arranged at a bottom of the transformer, a positioning element is arranged on an upper surface of the base of the vessel, and the footings are fixedly connected with the positioning element;

a connecting piece is arranged at an upper part of the transformer and is connected with the top cover of the vessel.

In some embodiments, the top cover of the vessel is further provided with cable boxes and cable supports; gland plates are arranged on side walls of the cable boxes, and hand hole cover plates are arranged on tops of the cable boxes; the cable boxes comprises a high-voltage cable box and a low-voltage cable box.

In some embodiments, the transformer comprises one or more transformer active parts, and each of the transformer active parts comprises an iron core and a coil wound at a periphery of the iron core;

an upper part of the transformer active part is further provided with a high-voltage tapping patch board located below the hand hole cover plate of the high-voltage cable box.

The sealed dry-type transformer provided by the present application is provided with a sealed vessel, and therefore, the protection rating reaches IP54. The transformer of the dry-type transformer is mounted in the vessel, so that the key components, such as the transformer active part, are completely isolated from the external environment. The housing has certain strength, and a pressure relief device is matched, so that an arcing test may be passed without damage, and internal electric structures may be effectively protected. The vessel is provided with a thermal conductive element with a special structure, so that internal and external thermal conductive areas may be increased, and heat generated by the internal electric structures may be radiated effectively. A main thermal conductive surface inside the transformer is coated with a thermal conductive coating by which the thermal conductive efficiency is increased. The sealed dry-type transformer provided by the present application may be applied to all application scenarios of conventional oil-immersed transformers and dry-type transformers and is lower in shutdown fault rate, longer in service life and completely maintenance-free. Moreover, there is no auxiliary machine loss, and the overall efficiency is increased.

As used herein, except where the context clearly requires otherwise, the term "comprise" and variations of the term, such as "comprising", "comprises" and "comprised", are not intended to exclude further features, components, integers or steps.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings described herein are provided for further understanding of the present application, and constitute one part of the present application. Schematic embodiments of the present application and descriptions thereof serve to explain the present application, rather than to improperly limit the present application.

Fig. 1 is a front view of a sealed dry-type transformer in one embodiment of the present application;

Fig. 2 is a sectional view of the sealed dry-type transformer along line A-A in Fig.1;

Fig. 3 is a perspective view of a sealed dry-type transformer in one embodiment of the present application;

Fig. 4 is a sectional view of the sealed dry-type transformer along line B-B in Fig.1;

Fig. 5a is a structural schematic view of a thermal conductive assembly of a sealed dry-type transformer in one embodiment of the present application;

Fig. 5b is a partial enlarged view of part E in Fig. 5a;

Fig. 6 is a partial enlarged view of part C in Fig. 4;

Fig. 7 is a top view of a sealed dry-type transformer in one embodiment of the present application;

Fig. 8 is a sectional view of the sealed dry-type transformer along line D-D in Fig.2;

in which: 1, transformer; 11, footing; 12, positioning element; 13, connecting piece; 14, transformer active part; 141, iron core; 142, coil; 143, high-voltage tapping patch board; 2, vessel; 21, top cover; 211, cable box; 2111, gland plate; 2112, hand hole cover plate; 2113, through hole; 212, cable support; 22, base; 23, thermal conductive assembly; 231, thermal conductive element; 2311, layer of thermal conductive element; 232, sealing strip; 233, fixed plate for mounting; 24, housing frame; 241, main body; 242, first mounting part; 243, second mounting part; 3, arc light discharge sensor; 4, temperature controller; , hoisting ring; and 6, pressure relief element.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The technical solutions in embodiments will be clearly and completely described below in combination with the accompanying drawings in embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. On the basis of the embodiments of the application, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the present application.

In the description of the present application, it is to be noted that the direction or positional relationships indicated by terms "upper", "lower", "horizontal", "inner", "outer" and the like are based on the positional relationships in the drawings, these terms are merely used to facilitate the description of the present application and simplify the description, yet do not indicate or imply that the devices or elements referred must have a particular orientation, be constructed and operated in particular orientation, and therefore should not be interpreted as a limitation on this application.

In the description of the present application, it is to be understood that terms "first", "second" are merely used for descriptive purpose and should not be interpreted to indicate or imply the relative importance or implicitly indicate the number of technical features indicated. Thus, the features defined by "first" and "second" may explicitly or implicitly include one or more of the features.

In the description of the present application, it is to be noted that, unless clearly indicates otherwise, terms "connect", "connection" shall be generally understood, such as, may be fixed connection, detachable connection or integrated connection, may be directly connected, or indirectly connected through intermediate media, or inner communication of two components. For the person skilled in the art, the specific meanings of the above terms in the present application may be interpreted according to specific circumstance.

As shown in Fig. 1 to Fig. 3, in a schematic embodiment of a sealed dry-type transformer provided by the present application, the transformer comprises:

a transformer 1 and a vessel 2 mounted outside the transformer 1, wherein the vessel 2 is of a sealed structure and is filled with an insulating and thermal conductive medium;

the vessel 2 comprises a top cover 21, a base 22 and thermal conductive assemblies 23 connected between the top cover 21 and the base 22; and

the thermal conductive assemblies 23 are provided with thermal conductive structures. Wherein, the insulating and thermal conductive medium may be dried air, nitrogen and the like.

Specifically, as shown in Fig. 4, support structures 24 are arranged around the base 22 of the vessel 2 and are perpendicular to a plane where the base is located, and the support structures 24 connects the base 22 and the top cover 21; and

the thermal conductive assemblies 23 are arranged between every two adjacent of the support structures 24.

Specifically, as shown in Fig. 5a and Fig. 5b, each of the thermal conductive assemblies 23 comprises a thermal conductive element 231; sealing strips 232 are arranged around the thermal conductive element 231; fixed plates for mounting 233 are arranged at two sides of the thermal conductive element 231; the fixed plates for mounting 233 are connected with the support structures 24 so that the thermal conductive element 231 is fixedly mounted among the support structures 24; and due to the arrangement of the sealing strips 233 around the thermal conductive element 231, the thermal conductive elements 231, the support structures 24, the top cover 21 and the base 22 form the vessel 2 which is of the sealed structure.

In some embodiments, as shown in Fig. 6, each of the support structures 24 comprises a main body 241 extending in a vertical direction as well as a first mounting part 242 and a second mounting part 243 which are connected with the main body 241 and extends in the vertical direction, and the first mounting part 242 and the second mounting part 243 are respectively connected with the adjacent thermal conductive assemblies 23. Specifically, the first mounting part and the second mounting part are respectively connected with the fixed plates for mounting of the thermal conductive assemblies adjacent to two sides of the housing frame. In the present embodiment, sections of the vessels are of a rectangle, there are six support structures in total, wherein four of the support structures are located at vertexes of the rectangle, and two of the support structures are located at two long sides of the rectangle. Extension directions of the adjacent thermal conductive assemblies of the support structures located at the vertexes are perpendicular to each other, and therefore, the first mounting part and the second mounting part are perpendicular to each other. Extension directions of the adjacent thermal conductive assemblies of the support structures located at the long sides are the same, and therefore, the first mounting part and the second mounting part extend in the same direction (a direction where the rectangle is located).

Specifically, as shown in Fig. 6, the thermal conductive element 231 is of a multi-sheet corrugated structure, that is, the thermal conductive element 231 comprises layers of thermal conductive element 2311; a surface of the layer of thermal conductive element 2311 is corrugated or profiled. The multiple layers of elements are connected by a high thermal conducting material or heat pipe. The thermal conductive element which is of the double-sided corrugated structure may increase the effective thermal conductive area and increase the thermal conductive efficiency in an internal environment of the vessel and the thermal conductive element, so that heat generated by internal electric operation inside the vessel is radiated to the external environment with relatively high thermal conductive efficiency.

In some embodiments, the thermal conductive element consists of at least one profiled metal sheet and the surface of the thermal conductive element is corrugated. In an instance where there is more than one profiled metal sheet, the metal sheets are connected by a high thermal conducting material or heat pipe.

In some embodiments, as shown in Fig. 7, the sealed dry-type transformer further comprises pressure relief elements 6, and the pressure relief elements 6 are connected with the vessel 2 and capable of controlling the communication between the vessel and the external environment so as to release a pressure inside the vessel. There may be one or more pressure relief elements, and the number of the pressure relief elements is set according to a pressure relief demand of the vessel. In the present embodiment, the pressure relief elements select blasting caps, two of which are set and are arranged on the top cover of the vessel.

In some embodiments, the top cover 21 of the vessel 2 is further provided with an arc light discharge sensor 3. The arc light discharge sensor 3 is capable of sensing fault discharge caused by faults inside the vessel of the sealed transformer; so that it is ensured that the faults inside the sealed transformer may be monitored in time.

As shown in Fig. 8, the transformer 1 is mounted inside the vessel 2, footings 11 are arranged at a bottom of the transformer 1, a positioning element 12 is arranged on an upper surface of the base 22 of the vessel, and the footings 11 are fixedly connected with the positioning element 12;

a connecting piece 13 is arranged at an upper part of the transformer 1 and is connected with the top cover 21 of the vessel; and

by virtue of the above-mentioned structure, the transformer may be fixedly arranged inside the vessel.

Specifically, as shown in Fig. 2 and Fig. 8, the transformer 1 comprises one or more transformer active parts 14, and each of the transformer active parts 14 comprises an iron core 141 and a coil 142 wound at a periphery of the iron core 141.

As a preferred implementation, each of the layers of thermal conductive element 2311 and the transformer active part 14 is coated with a thermal conductive coating which has relatively high thermal radiation absorptivity. The heat exchange rate between the transformer active part and gas medium and between the gas medium and the layer of thermal conductive element may be increased, and the thermal conductive efficiency may be increased.

Specifically, the top cover 21 of the vessel 2 is further provided with cable boxes 211 and cable supports 212. The cable boxes 211 are used for inserting high-voltage and low-voltage cables, gland plates 2111 are arranged on side walls of the cable boxes 211, and hand hole cover plates 2112 are arranged on tops of the cable boxes 211. Through holes 2113 are formed in the gland plates and are used for introducing the high-voltage and low-voltage cables, the high-voltage and low-voltage cables introduced through the through hole are sealed and fixed by using glands, and the cables located outside the vessel are fixedly arranged on the cable supports after wire connection is completed. As shown in Fig. 3, the top cover of the sealed dry-type transformer provided in the present embodiment is provided with a high-voltage cable box for inserting the high-voltage cable and a low-voltage cable box for inserting the low-voltage cable.

An upper part of the transformer active part 14 is further provided with a high-voltage tapping patch board 143 located below the hand hole cover plate 2112 of the high-voltage cable box. When a variable ratio is required to be regulated, the hand hole cover plate of the high-voltage cable box may be removed, a wire connection order on the high-voltage tapping patch board may be regulated, and thus, the variable ratio of the transformer is regulated.

In some embodiments, the top cover 21 of the vessel 2 is further provided with hoisting rings 5 for hoisting the transformer when the transformer needs to be moved, and thus, the transformer is moved as a whole.

In some embodiments, the top cover 21 of the vessel 2 is further provided with a temperature controller 4 which is used for detecting the temperature inside the vessel and monitoring whether the temperature inside the vessel is kept in a certain safe range in real time.

In some embodiments, a desiccant bag is further placed inside the vessel 2. The desiccant bag may absorb moisture inside the housing and guarantees the dryness of the transformer active part in a transformer transportation or storage process. After the transformer is put into operation, a desiccant may be dried by heat generated by the operation of the transformer with the rise of the temperature inside the housing.

Finally, it should be noted that each embodiment in this description is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts of each embodiment can be referred to each other.

The above embodiments are only used to illustrate the technical solutions of the present application rather than limit it; although the application has been described in detail with reference to the preferred embodiment, those skilled in the art should understand that the specific embodiment of the application can still be modified or some technical features can be replaced equally; without departing from the spirit of the technical solutions of the application, it shall be covered within the scope of the technical solutions claimed by the present application.

Claims (10)

CLAIMS:

1. A sealed dry-type transformer, comprising a vessel which surrounds a transformer core and windings, wherein the vessel is of a sealed structure and is filled with an electrically insulated and thermal conductive medium;

the vessel comprises a top cover, a base and thermal conductive assemblies connected between the top cover and the base; and

the thermal conductive assemblies are provided with thermal conductive structures.

2. The sealed dry-type transformer according to claim 1, wherein support structures are arranged around the base of the vessel and are perpendicular to a plane whereof the base, and the support structures connects the base and the top cover; and

the thermal conductive assemblies are arranged between the support structures.

3. The sealed dry-type transformer according to claim 2, wherein each of the thermal conductive assemblies comprises a thermal conductive element; sealing strips are arranged around the thermal conductive element; fixed plates for mounting are arranged at two sides of the thermal conductive element; the fixed plates for mounting are connected with the support structures so that the thermal conductive element is fixedly mounted among the support structures; and due to the arrangement of the sealing strips around the thermal conductive element, the thermal conductive element, the support structures, the top cover and the base form the sealed vessel.

4. The sealed dry-type transformer according to claim 3, wherein each of the support structures comprises a main body extending in a vertical direction as well as a first mounting part and a second mounting part which are connected with the main body and extends in the vertical direction, and the first mounting part and the second mounting part are respectively connected with the adjacent thermal conductive assemblies.

5. The sealed dry-type transformer according to claim 4, wherein the first mounting part and the second mounting part are respectively connected with the fixed plates for mounting of the thermal conductive assemblies adjacent to two sides of the housing frame.

6. The sealed dry-type transformer according to claim 3, wherein the thermal conductive element comprises at least one layer of the thermal conductive element, a surface of the layer of thermal conductive element is corrugated;

when the layer of the thermal conductive element is more than one, the thermal conductive element is of a multi-sheet corrugated structure.

7. The sealed dry-type transformer according to any one of claims 1-6, further comprising one or more pressure relief elements and one or more arc light discharge sensors.

8. The sealed dry-type transformer according to claim 7, wherein the transformer is mounted inside the vessel, footings are arranged at a bottom of the transformer, a positioning element is arranged on an upper surface of the base of the vessel, and the footings are fixedly connected with the positioning element;

a connecting piece is arranged at an upper part of the transformer and is connected with the top cover of the vessel.

9. The sealed dry-type transformer according to claim 7, wherein the top cover of the vessel is further provided with cable boxes and cable supports; gland plates are arranged on side walls of the cable boxes, and hand hole cover plates are arranged on tops of the cable boxes; the cable boxes comprises a high-voltage cable box and a low-voltage cable box.

10. The sealed dry-type transformer according to claim 9, wherein the transformer comprises one or more transformer active parts, and each of the transformer active parts comprises an iron core and a coil wound at a periphery of the iron core;

an upper part of the transformer active part is further provided with a high-voltage tapping patch board located below the hand hole cover plate of the high-voltage cable box.