Transformer tank for a shell transformer, shell transformer and method for clamping a magnetic core of a shell transformer

Abstract

Transformer tank for a shell transformer (100), comprising: - a wall (111) surrounding a tank interior (112); - a clamping device (120) for exerting a clamping force (121) on a magnetic core (101) of the shell transformer (100), wherein the clamping device (120) comprises: - a beam (122) fixed on the wall (111); - a plunger (123) comprising a first axial end (124) configured to exert the clamping force (121) on the magnetic core (101), wherein the plunger (123) is movable along its longitudinal axis (126) relative to the beam (122), and wherein a value of the clamping force (121) is settable depending on a position of the plunger relative to the beam (122).

Description

Technical Field

[0001] This disclosure relates to a transformer box for a shell-type transformer, a shell-type transformer, and a method for clamping the core of a shell-type transformer. Background Technology

[0002] US 3082391 and US 3234492 relate to shell-type transformers.

[0003] There is a need for a transformer box for a reliable and stable shell-type transformer, a reliable and stable shell-type transformer, and a method for clamping the core of the shell-type transformer (which allows for precise setting of the clamping force).

[0004] A transformer box houses the components of a transformer, such as one or more coils and one or more magnetic cores (also known as magnetic circuits). Summary of the Invention

[0005] According to an embodiment, a transformer enclosure for a shell-type transformer is disclosed. The transformer enclosure includes:

[0006] - A wall that surrounds the inside of the box;

[0007] - Clamping device for applying clamping force to the core of a shell-type transformer.

[0008] -The clamping device includes:

[0009] - Beams, fixed to the wall;

[0010] - A plunger, the plunger including a first axial end configured to apply a clamping force on the magnetic core, wherein the plunger is movable relative to the beam along its longitudinal axis, and the value of the clamping force is set according to the position of the plunger relative to the beam.

[0011] A transformer enclosure is configured to house the components of a transformer (especially a shell-type transformer). For example, a transformer enclosure is configured to house a magnetic core and one or more coils. A beam fixed to the wall of the transformer enclosure is also referred to as a short-circuit beam. Along the longitudinal axis, a designated mounting space for the magnetic core is arranged below the beam. A plunger is arranged and configured to apply a clamping force between the beam and the magnetic core. The plunger is supported at a second axial end of the beam, opposite a first axial end. The clamping force can be controlled by controlling the position of the plunger relative to the beam. Therefore, the total force transmitted to the magnetic core can be set to a desired value. This allows for reliable clamping of the magnetic core, particularly clamping different parts of the core together. This allows for a stable and reliable arrangement of the transformer enclosure and the transformer comprising it.

[0012] For example, a transformer box, particularly a clamping device, includes a screw mechanism. The screw mechanism contacts the second axial end of a plunger. The screw mechanism is configured to move the plunger along its longitudinal axis. By tightening one or more screws of the screw mechanism, the plunger can be pushed in a direction toward the magnetic core. Therefore, the clamping force can be set according to the screw of the screw mechanism, and in particular according to the torque applied to the screw.

[0013] For example, a plunger is arranged in a plunger sleeve. The plunger sleeve and the plunger (for example) form a unit, particularly together with a screw mechanism. This unit is mounted on a beam in the wall of the transformer tank.

[0014] According to embodiments, the transformer box, particularly the clamping device, includes multiple plungers. For example, the plungers may be similar in structure and function. Alternatively, the plungers may differ in structure and design.

[0015] According to a further embodiment, the different plungers are designed differently. The plungers are configured to apply a preset clamping force to the magnetic core. For each plunger, the preset clamping force may be the same or different.

[0016] According to an embodiment, the shell-type transformer includes a transformer housing according to at least one embodiment described herein. The shell-type transformer includes a magnetic core. A plunger applies a preset clamping force to the magnetic core. Thus, the magnetic core is stably and reliably secured within the transformer housing.

[0017] According to an embodiment, a method for clamping the core of a shell-type transformer includes moving a plunger relative to the wall of the transformer housing along its longitudinal axis. This establishes a clamping force on the transformer core. By moving the plunger along its longitudinal axis, the value of the clamping force is set to a desired preset value. Therefore, the core is clamped with a known clamping force.

[0018] For example, one or more screws are used to force the plungers against the magnetic core. Alternatively, multiple plungers can be moved along their respective longitudinal axes to apply a clamping force to the magnetic core with a predetermined value.

[0019] For example, the method for clamping the magnetic core is performed using a transformer box for shell-type transformers as described herein. The features and advantages described in conjunction with the transformer box and transformer also apply to this method and other methods. Attached Figure Description

[0020] The accompanying drawings are included to provide further understanding. In the drawings, elements having the same structure and / or function can be represented by the same reference numerals. It should be understood that the embodiments shown in the drawings are illustrative and are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of a transformer according to an embodiment.

[0022] Figure 2 This is a schematic diagram of a transformer according to an embodiment.

[0023] Figure 3 and Figure 4 This is a schematic diagram of a transformer box according to an embodiment.

[0024] Figures 5 to 7 This is a schematic diagram of the plunger and plunger sleeve according to an embodiment.

[0025] Figure 8 and Figure 9 This is a schematic diagram of the clamping device according to an embodiment.

[0026] Figure 10 This is a flowchart of a method for clamping a magnetic core according to an embodiment. Detailed Implementation

[0027] While various modifications and alternatives may be made to this disclosure, its details have been shown by way of example in the accompanying drawings and will be described in detail. However, it should be understood that this disclosure is not intended to be limited to the specific embodiments described. Rather, it is intended to cover all modifications, equivalents, and alternatives falling within the scope of this disclosure as defined by the appended claims.

[0028] Figure 1 A shell-type transformer 100 according to an embodiment is schematically shown.

[0029] Figure 2 A portion of the shell-type transformer 100 is schematically shown in a top view.

[0030] For example, the shell-type transformer 100 can be a single-phase transformer or a three-phase transformer. The shell-type transformer 100 includes a transformer housing 110. The walls 111 of the transformer housing 110 surround a housing interior 112. A magnetic core 101 and one or more coils 102 are arranged within the housing interior 112. For example, the magnetic core includes multiple core sections 103 and 104 (…). Figure 2 Together, they form a magnetic core 101. Magnetic core portions 103 and 104 are connected at a connector 105. A coil 102 is at least partially surrounded by the magnetic core 101.

[0031] The transformer enclosure 110 includes an upper enclosure portion 113 and a lower enclosure portion 114. For example, the lower enclosure portion 114 is arranged below the upper enclosure portion 113 along its long axis 126. The lower enclosure portion 114 includes a bottom 117, for example, for supporting the shell-type transformer 100 in an underground location.

[0032] The upper compartment 113 includes an upper opening 115. The upper opening 115 allows access to the interior 112 of the compartment. During use, the upper opening 115 is closed, for example, by a cover 116.

[0033] A clamping device 120 is disposed on the inside of the wall 111 within the housing interior 112 (particularly in the upper housing portion 113). The clamping device 120 includes one or more beams 122. The beams 122 are also referred to as short-circuit beams. The beams 122 are disposed above the magnetic core 101. A portion of the coil 102 is disposed between the beams 122. The beams 122 are disposed along the longitudinal axis 126 between the upper opening 115 or cover 116 and the magnetic core 101.

[0034] The clamping device 120 includes one or more plungers 123. The plungers 123 are tensioned between the beam 122 and the magnetic core 101. The plungers 123 apply force to the magnetic core 101 along its long axis 126. This secures the magnetic core 101 (particularly core portions 103, 104) tightly within the transformer housing 110. A desired clamping force 121 acts on the core portions 103, 104. This results in a connecting force between the core portions 103, 104. The clamping device 120 allows the clamping force to be precisely set to the desired reset value. This results in a rigid core with high pressure at the joint 105. Especially in the event of a short circuit, this rigid core absorbs the load. Therefore, a reliable and stable shell-type transformer 100 is achieved.

[0035] Figure 3 and Figure 4 Different views of the transformer box 110 are schematically shown, and Figures 5 to 7 The plunger 123 and plunger sleeve 127 are schematically shown.

[0036] Figure 3 The upper box portion 113 with an upper opening 115 is shown. Figure 4 A view of the lower box portion 114 from below is shown.

[0037] The clamping device 120 includes a plunger 123 disposed in a corresponding plunger sleeve 127. The plunger sleeves are respectively connected to the beam 122 by, for example, welding. The plunger 123 is movable, sliding, displaced, and adjustable relative to the corresponding plunger sleeve 127 along the longitudinal axis 126.

[0038] For example, such as Figure 5 and Figure 7 As shown, the plunger sleeve 127 is a hollow sleeve surrounding the sleeve interior 135 (e.g., Figure 5 and 7The interior 135 of the sleeve is confined at the first axial end 131. During operation, the first axial end 131 of the plunger sleeve 127 faces the upward opening 115. The first axial end 131 of the plunger sleeve 127 can be accessed through the upper opening 115.

[0039] A screw mechanism 128 is arranged at the first axial end 131 of the plunger sleeve 127. The screw mechanism 128 includes one or more screws 129, for example, four screws 129. The screws 129 are rotatable in the threads of the plunger sleeve 127 to move relative to the plunger sleeve 127 along the longitudinal axis 126. Therefore, the portion of the screw 129 protruding from the sleeve interior 135 is adjustable. Specifically, the length of the protruding portion of the screw 129 is adjustable.

[0040] The plunger sleeve 127 includes a second axial end 132 opposite to the first axial end 131 along the longitudinal axis 126. The plunger sleeve 127 includes an opening 130 at the second axial end 132. The opening 130 is configured to allow the plunger 123 to reach the outside of the plunger sleeve 127 from the inside 135 of the sleeve through the opening 130. A protrusion 133 of the plunger 123 protrudes at the second axial end 132 of the plunger sleeve 127 and extends above the plunger sleeve 127.

[0041] For example, such as Figure 6 As shown, the plunger 123 includes a first axial end 124 and a second axial end 125. The second axial end 125 is opposite to the first axial end 124 along the longitudinal axis 126. The plunger 123 has an elongated shape along the longitudinal axis 126 between the first axial end 124 and the second axial end 125.

[0042] The second axial end 125 of the plunger 123 is disposed at the first axial end 131 of the plunger sleeve 127. The second axial end 125 of the plunger 123 contacts the screw mechanism 128, and in particular the screw 129.

[0043] The first axial end 124 of the plunger 123 protrudes above the second axial end 132 of the plunger sleeve 127. A contact surface 134 is formed at the first axial end 124 of the plunger 123. The plunger 123 contacts the magnetic core 101 through the contact surface 134.

[0044] The screw 129 of the screw assembly 128 allows for precise positioning of the plunger 123 relative to the plunger sleeve 127. The screw 129 sets the displacement of the plunger 123 along the longitudinal axis 126 in the direction toward the magnetic core 101. The screw allows control over how far the protrusion 133 protrudes onto the plunger sleeve 127. The screw 129 pushes against the second axial end 125 of the plunger sleeve 129, allowing a clamping force 121 to be applied from the first axial end 124.

[0045] according to Figure 3 and Figure 4 In the illustrated embodiment, the clamping device 120 includes four plungers 123 located on two opposing inner sides of the housing 110. According to another embodiment, the number of plungers 123 is different, for example, more than four or fewer than four plungers per side. The position of the plungers 123 relative to the housing 110 is, for example, determined by the preferred position where the clamping force 121 should act on the magnetic core 101. In particular, the corresponding positions of the plungers 123 are predetermined based on the position of the joint 105 between the magnetic core portions 103, 104. The positions of the plungers 123 are selected such that the desired connection force is applied to the joint 105.

[0046] Figure 8 and Figure 9 A schematic diagram of a clamping device 120 according to an embodiment is shown. A beam 122 forms a rectangular frame configured to surround a portion of the coil 102. A plunger sleeve 127 is arranged almost entirely or completely inside the beam 122, allowing the screw mechanism 128 to be accessed from above. The plunger sleeve 127 extends from the upper side 137 of the frame 136 to the lower side 138 of the frame 136. The upper side 137 faces the opening 115 of the housing 110. The lower side 138 of the frame 136 faces the bottom 117 of the housing. The screw mechanism 128 is accessible at the upper side 137. A plunger 123 extends from the screw mechanism 128 through the frame 136 to the lower side 138. At the lower side 138, the plunger 123 applies a clamping force 121 to the magnetic core 101. The value of the clamping force 121 can be precisely set by applying a corresponding torque to the screw 129. Due to the contact between the plunger 123 and the magnetic core 101 at the contact surface 134, the torque applied to the screw 129 is transmitted to the plunger 123 and then to the magnetic core 101. According to an embodiment, for example, a torque between 100 N·m and 300 N·m is applied to the M16 type (metric thread) screw 129. Of course, other types of screws with different diameters can be used, and correspondingly, different torques are applied to the screw 129 depending on the desired clamping force 121.

[0047] Figure 10 A flowchart of a method for clamping a magnetic core 101 according to an embodiment is shown.

[0048] In step S1, the screw 129 is rotated to apply torque to the plunger 123. The screw is rotated according to a predetermined torque, which is determined based on the desired clamping force 121.

[0049] In step S2, the rotation of screw 129 causes plunger 123 to move according to the applied torque.

[0050] In step S3, the movement of the plunger 123 applies a clamping force 121 to the magnetic core 101. Of course, the rotation of the screw 129, the movement of the plunger 123, and the application of the clamping force 121 actually occur simultaneously.

[0051] The clamping device 120 allows for increased connection force in the connector 105 of the core 101 of the shell transformer 100. A plunger 123 is embedded in a plunger sleeve 127 and in the beam 122 of the upper housing portion 113. The clamping force 121, and thus the connection force, is controlled by a screw 129 located at the first axial end 131 of the plunger sleeve 127. A known torque or tightening force of the screw 129 results in a known clamping force 121 transmitted to the core 101, and thus a known connection force. According to an embodiment, the plunger 123, the plunger sleeve 129, and the screw device 128 are assembled onto a single unit before being welded to the beam 122.

[0052] The screw mechanism 128 can be accessed from above through the upper opening 150. Therefore, the clamping force 121 can be controlled not only during the initial installation of the shell-type transformer 100 but also during subsequent maintenance. To control the clamping force 121, the shell-type transformer 100 does not need to be completely disassembled. Only the screw 129, easily accessible through the upper opening 115 or the opening in the cover 116, located at the upper side 137, must be reached with a tool. Therefore, the force acting on the magnetic core 101, and particularly on the connector 105, can be easily, accurately, and reliably controlled. A securely fastened magnetic core 101 better withstands short-circuit forces.

[0053] The controlled clamping of the magnetic core 101 by the precisely settable clamping force 121 results in higher reliability of the transformer 100. The clamping device 120 allows the magnetic core 101 to be re-clamped during its service life. The clamping device 120 realizes a reliable system for applying the desired preset clamping force 121 to the magnetic core 101.

[0054] Figures 1 to 10 The embodiments shown represent exemplary embodiments of the transformer housing 110, transformer 100, and method for clamping magnetic core 101; therefore, they do not constitute a complete list of all embodiments of the transformer housing 110, transformer 100, and method. The actual arrangement of the transformer housing 110, transformer 100, and method may differ from the embodiments shown in the figures.

[0055] Reference Marker

[0056] 100 shell-type transformer

[0057] 101 magnetic core

[0058] 102 coil

[0059] 103 and 104 magnetic core sections

[0060] 105 connector

[0061] 110 Transformer Box

[0062] 111 wall

[0063] Inside 112 boxes

[0064] 113 Upper Box Section

[0065] 114 Lower Box Section

[0066] 115 upper opening

[0067] 116 cover

[0068] 117 bottom

[0069] 120 clamping device

[0070] 121 clamping force

[0071] 122 beams

[0072] 123 plunger

[0073] 124 First Axial End

[0074] 125 Second Axial End

[0075] 126 vertical axis

[0076] 127 plunger sleeve

[0077] 128 screw mechanism

[0078] 129 screw

[0079] 130 opening

[0080] The first axial end of the 131 plunger sleeve

[0081] The second axial end of the 132 plunger sleeve

[0082] 133 protrusions

[0083] 134 contact surfaces

[0084] 135 sleeve interior

[0085] 136 frame

[0086] 137 upper side

[0087] 138 lower side

[0088] S1 to S3 Method Steps

Claims

1. A transformer box for a shell-type transformer (100), comprising: - Wall (111), the wall (111) surrounds the interior of the box (112); - A clamping device (120) for applying a clamping force (121) to the magnetic core (101) of the shell-type transformer (100), the clamping device being arranged on the inside of the wall (111) inside the housing (112). - Wherein, the clamping device (120) includes: - Beam (122), which is fixed to the wall (111), - A plunger (123) including a first axial end (124) configured to apply the clamping force (121) on the magnetic core (101), wherein the plunger (123) is movable relative to the beam (122) along its longitudinal axis (126), and the value of the clamping force (121) is set according to the position of the plunger (123) relative to the beam (122). - A screw mechanism (128) that contacts the second axial end (125) of the plunger (123) for moving the plunger (123) along its longitudinal axis (126). - A plunger sleeve (127), said plunger sleeve (127) being arranged inside the beam (122), wherein - The plunger (123) is disposed inside the plunger sleeve (127) and is movable relative to the plunger sleeve (127) along its longitudinal axis (126). - The plunger sleeve (127) includes a first axial end (131) and an opposing second axial end (132). - The screw mechanism (128) is arranged at the first axial end (131). - The screw mechanism (128) includes one or more screws (129). - The screw (129) is rotatable in the threads of the plunger sleeve (127) to move relative to the plunger sleeve (127) along the longitudinal axis (126), wherein a portion of the screw (129) protruding from the sleeve interior (135) is configured, and - The second axial end (125) of the plunger (123) is arranged at the first axial end (131) of the plunger sleeve (127) and is in contact with the screw mechanism (128).

2. The transformer box according to claim 1, wherein... - The plunger sleeve (127) includes an opening (130) at the second axial end (132), and - The plunger (123) reaches through the opening (130) and protrudes over the plunger sleeve (127) at the second axial end (132).

3. The transformer box according to claim 1, wherein, The clamping device (120) is arranged in the upper box portion (113) of the transformer box (110) such that the clamping device (120) can be approached from the upper opening (115) of the transformer box (110).

4. The transformer box according to any one of claims 1 to 3, wherein, The clamping device (120) includes a plurality of plungers (123) configured to apply an adjustable clamping force (121) to the magnetic core (101).

5. A shell-type transformer, comprising: - Transformer box (110) according to any one of claims 1 to 4; - The magnetic core (101), wherein the plunger (123) applies a preset value of the clamping force (121) to the magnetic core (101).

6. The shell-type transformer according to claim 5, wherein, The plunger (123) is movable relative to the beam (122) to apply the clamping force (121) on the magnetic core (101) such that the clamping force (121) pushes the magnetic core (101) away from the beam.

7. The shell-type transformer according to claim 5 or 6, wherein, The magnetic core (101) comprises two separate magnetic core portions (103, 104), and the force at the joint (150) between the two magnetic core portions (103, 104) can be set according to the value of the clamping force (121).

8. A method for clamping the magnetic core (101) of a shell-type transformer (100) according to any one of claims 5 to 7, comprising: - Rotate the screw (129) to move the plunger (123) along its longitudinal axis (126) relative to the wall (111) of the transformer tank (110), wherein the screw (129) contacts the second axial end (125) of the plunger (123), thereby - The clamping force (121) is applied to the magnetic core (101) of the transformer (100), and - The clamping force (121) is set to the preset value by rotating the screw (129) with a torque value corresponding to the preset value of the clamping force (121).

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