A fuse structure and a transformer
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2026-08-14
AI Technical Summary
[0005]本实用新型的主要目的是提供一种熔丝结构，将熔丝组进行并联后再接入至高压侧线圈和负荷开关之间，有效提高熔丝结构的过载保护能力，解决现有的熔丝结构与大容量变压器的高压侧额定电流相比安全余量小，在实际运行中容易因电流波动导致过载熔丝误动作，引发变压器非计划性跳脱而影响供电可靠性的问题
[0016]本实用新型通过将熔丝组进行并联后再接入至高压侧线圈和负荷开关之间，由于在并联电路中，总电流等于各支路电流之和，能够有效提高熔丝结构的过载保护能力，例如，当采用的过载熔丝(型号为4000380C16CBCN)的额定电流为80A，并将两个熔丝组进行并联，并联后的两个熔丝组能够承受的最大过载电流为160A，与大容量变压器(容量为6750kVA)的高压侧额定电流(112.96A)相比仍然具有足够的安全余量；此外，由于每个熔丝组中均包括串联连接的过载熔丝和后备熔丝，应用于大容量的变压器(容量为6750kVA)中时，过载熔丝作为主保护，后备熔丝作为后备在过载熔丝失效时介入进行保护，应对大容量变压器的高短路电路时可以显著提升变压器的整体分断能力，从而可解决现有的熔丝结构与大容量变压器的高压侧额定电流相比安全余量小，在实际运行中容易因电流波动导致过载熔丝误动作，引发变压器非计划性跳脱而影响供电可靠性的问题。
Smart Images
Figure CN224637183U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of fuses, and in particular to a fuse structure and a transformer. Background Technology
[0002] Fuse is an important protective measure in power systems. Through thermal effect detection circuits, it can quickly cut off the circuit when the current exceeds the rated value, preventing equipment damage and the escalation of accidents.
[0003] Under normal circumstances, a transformer with a capacity of 5140kVA has a high-voltage side voltage of 34.5kV and a low-voltage side voltage of 0.69kV. At this time, the rated current on the high-voltage side is 86.02A (rated current on the high-voltage side = capacity / high-voltage side voltage / √3). Currently, the maximum rated current of the ejector fuse (i.e., overload fuse) on the market is 120A, which has sufficient safety margin compared with the rated current on the high-voltage side (86.02A).
[0004] However, with the growth of social electricity demand and the improvement of power grid capacity, the capacity of transformers is also constantly increasing. When the transformer capacity increases to 6750kVA, the wiring method remains unchanged (the high-voltage side is usually D-connected), and its high-voltage side voltage is 34.5kV. At this time, the rated current on the high-voltage side will reach 112.96A, and the large-capacity transformer will also generate a larger short-circuit current. Compared with the rated current of the current overload fuses on the market, which is a maximum of 120A, the rated current on the high-voltage side of the large-capacity transformer has a smaller safety margin. In actual operation, the overload fuse is prone to malfunction due to current fluctuations, causing unplanned tripping of the transformer and premature protection, which will affect the reliability of power supply. Utility Model Content
[0005] The main purpose of this utility model is to provide a fuse structure that connects fuse groups in parallel before connecting them between the high-voltage side coil and the load switch, thereby effectively improving the overload protection capability of the fuse structure. This solves the problem that the existing fuse structure has a small safety margin compared to the rated current of the high-voltage side of a large-capacity transformer, and is prone to overload fuse malfunction due to current fluctuations in actual operation, which can lead to unplanned transformer tripping and affect the reliability of power supply.
[0006] Another objective of this invention is to provide a transformer with better overload protection capabilities and better overall breaking capacity in the case of high short-circuit circuits of large-capacity transformers. This addresses the problem that existing fuse structures have a small safety margin compared to the rated current on the high-voltage side of large-capacity transformers, and are prone to overload fuse malfunctions due to current fluctuations during actual operation, leading to unplanned transformer tripping and affecting power supply reliability.
[0007] To achieve the above objectives, this utility model proposes a fuse structure applied to a transformer. The transformer includes a high-voltage side coil, a load switch, and a high-voltage bushing. The fuse structure includes a fuse assembly. The lead-out end of the high-voltage side coil is connected to one end of the fuse assembly, and the other end of the fuse assembly is connected to one end of the load switch. The other end of the load switch is connected to the high-voltage bushing. The fuse assembly includes at least two fuse groups, each fuse group being connected in parallel. Each fuse group includes an overload fuse and a backup fuse, and the overload fuse and the corresponding backup fuse are connected in series.
[0008] Optionally, one end of the overload fuse in the fuse group is connected to the lead-out terminal of the high-voltage side coil, the other end of the overload fuse is connected to one end of the corresponding backup fuse, and the other end of the backup fuse is connected to the load switch.
[0009] Optionally, the number of fuse groups in the fuse assembly is two.
[0010] This utility model also proposes a transformer, including a fuse structure as described in any of the above claims. The high-voltage side coil includes an A-phase coil, a B-phase coil, and a C-phase coil, and the wiring method between the A-phase coil, the B-phase coil, and the C-phase coil is a D-connection. Three fuse assemblies are provided, each corresponding to one of the A-phase coil, the B-phase coil, and the C-phase coil. The load switch is provided with an access point and a lead-out point, each access point corresponding to one of the A-phase coil, the B-phase coil, and the C-phase coil. The lead-out points are respectively set one-to-one with the A-phase coil, the B-phase coil, and the C-phase coil; the A-phase coil includes the A-phase coil start and the A-phase coil end, the B-phase coil includes the B-phase coil start and the B-phase coil end, and the C-phase coil includes the C-phase coil start and the C-phase coil end; the A-phase coil start, the B-phase coil start, and the C-phase coil start are respectively connected to one end of the corresponding fuse assembly, and the other end of the fuse assembly is connected to the connection point of the load switch, and the lead-out point of the load switch is connected to the high-voltage bushing.
[0011] Optionally, the number of high-voltage bushings is six, wherein the A-phase coil, the B-phase coil, and the C-phase coil each correspond to two high-voltage bushings; the lead-out points of the load switch include a first lead-out point and a second lead-out point; wherein the fuse assembly connected to the A-phase coil is connected to the corresponding connection point, the corresponding first lead-out point is connected to the corresponding high-voltage bushing, and the corresponding second lead-out point is connected to the corresponding other high-voltage bushing.
[0012] Optionally, the transformer further includes a housing, in which the high-voltage side coil, the load switch, the high-voltage bushing, and the fuse assembly are all disposed, with the high-voltage side coil, the load switch, and the fuse assembly located above the high-voltage side coil. The fuse structure further includes a fixing structure, comprising a supporting wooden structure and a clamping wooden structure. The supporting wooden structures are spaced apart along the length of the housing, and both ends of the supporting wooden structures are fixedly connected to the inner sidewall of the housing. The clamping wooden structures are spaced apart along the length of the supporting wooden structures. One end of the clamping wooden structure is fixedly connected to the upper surface of one of the supporting wooden structures, and the other end of the clamping wooden structure is fixedly connected to the upper surface of another supporting wooden structure. The clamping wooden structure and the supporting wooden structure are arranged perpendicular to each other. The clamping wooden structure has three sets of clamping spaces inside, and each set of clamping spaces includes two clamping ports spaced apart from top to bottom. The clamping ports are used to fix and install the backup fuse. The three sets of clamping spaces are distributed along the length of the clamping wooden structure, and the three sets of clamping spaces are respectively arranged in correspondence with the three fuse assemblies.
[0013] Optionally, the clamping wood structure includes a first clamping wood, a second clamping wood, and a third clamping wood; the first clamping wood is fixedly connected to the upper end face of the supporting wood structure, and the first clamping wood, the second clamping wood, and the third clamping wood are detachably connected sequentially from bottom to top; the upper end face of the first clamping wood has a first notch, the lower end face of the second clamping wood has a second notch corresponding to the first notch, and the first notch and the second notch enclose to form one of the clamping openings in the clamping space; the lower end face of the third clamping wood has a third notch, and the third notch and the first notch are positioned correspondingly; the upper end face of the second clamping wood has a fourth notch corresponding to the third notch, and the third notch and the fourth notch enclose to form another clamping opening in the corresponding clamping space.
[0014] Optionally, the fixing structure further includes a first tie rod, a second tie rod, and several bolts; one end of the first tie rod is fixedly connected to the bolts, and the other end of the first tie rod passes through the first clamping wood, the second clamping wood, and the third clamping wood in sequence before being fixedly connected to another bolt; one end of the second tie rod is fixedly connected to the bolts, and the other end of the second tie rod passes through the first clamping wood and the supporting wood structure in sequence before being fixedly connected to another bolt.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] This invention improves the overload protection capability of the fuse structure by connecting fuse groups in parallel before connecting them between the high-voltage side coil and the load switch. Since the total current in a parallel circuit equals the sum of the currents in each branch, this effectively enhances the overload protection capability of the fuse structure. For example, when using an overload fuse (model 4000380C16CBCN) with a rated current of 80A, and connecting two fuse groups in parallel, the maximum overload current that the two parallel fuse groups can withstand is 160A. This still provides sufficient safety margin compared to the rated current (112.96A) of the high-voltage side of a large-capacity transformer (6750kVA). Furthermore, since each fuse group includes an overload fuse and a backup fuse connected in series, when applied to a large-capacity transformer (capacity of 6750kVA), the overload fuse serves as the main protection, while the backup fuse acts as a backup to provide protection when the overload fuse fails. This can significantly improve the overall breaking capacity of the transformer when dealing with high short-circuit circuits in large-capacity transformers. This solves the problem that the existing fuse structure has a small safety margin compared to the rated current on the high-voltage side of large-capacity transformers, and is prone to overload fuse malfunction due to current fluctuations in actual operation, leading to unplanned transformer tripping and affecting power supply reliability. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the wiring method of the fuse structure according to an embodiment of the present invention;
[0018] Figure 2 This is a schematic diagram of a partial wiring configuration of a fuse structure according to an embodiment of the present invention;
[0019] Figure 3 This is a schematic diagram of the structure of a transformer according to an embodiment of the present invention;
[0020] Figure 4 This is a schematic diagram of the fuse structure, high-voltage side coil, load switch, high-voltage bushing and housing of one embodiment of the present invention (only the internal structure of the housing is shown);
[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle;
[0022] Figure 6 This is a schematic diagram of the fixing structure of the fuse structure according to an embodiment of the present invention;
[0023] Figure 7 This is a front view of the fixing structure of the fuse structure according to an embodiment of the present invention.
[0024] In the attached diagram: 1. Fuse structure; 11. Fuse assembly; 111. Fuse group; 1111. Overload fuse; 1112. Backup fuse; 12. Fixing structure; 121. Supporting wooden structure; 122. Clamping wooden structure; 1221. Clamping space; 12211. Clamping opening; 1222. First clamping wood; 12221. First notch; 1223. Second clamping wood; 12231. Second notch; 12232. Fourth notch; 1224. Third clamping wood; 12241. Third notch; 123. First pull rod; 124. Second pull rod; 2. High-voltage side coil; 21. Phase A coil; 22. Phase B coil; 23. Phase C coil; 3. Load switch; 31. Connection point; 32. Lead-out point; 321. First lead-out point; 322. Second lead-out point; 4. High-voltage bushing; 5. Housing. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a fixed connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0028] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0029] To resolve the above technical issues, please refer to [link / reference]. Figures 1 to 2 This utility model proposes a fuse structure 1 for use in a transformer. The transformer includes a high-voltage side coil 2, a load switch 3, and a high-voltage bushing 4. The fuse structure 1 includes a fuse assembly 11. The lead-out end of the high-voltage side coil 2 is connected to one end of the fuse assembly 11, the other end of the fuse assembly 11 is connected to one end of the load switch 3, and the other end of the load switch 3 is connected to the high-voltage bushing 4.
[0030] The fuse assembly 11 includes at least two fuse groups 111, each fuse group 111 being connected in parallel; each fuse group 111 includes an overload fuse 1111 and a backup fuse 1112, and the overload fuse 1111 and the corresponding backup fuse 1112 are connected in series.
[0031] Since the rated maximum breaking current of the overload fuse 1111 is limited, each fuse group 111 is configured to use the overload fuse 1111 and the backup fuse 1112 in series. This allows the overload fuse 1111 to operate at a current lower than the rated minimum breaking current of the backup fuse 1112, while the backup fuse 1112 operates at a current higher than the rated maximum breaking current of the overload fuse 1111. The overload fuse 1111 serves as the main protection, operating preferentially at low currents and primarily protecting against overload currents. The backup fuse 1112 serves as a backup, intervening to provide protection when the overload fuse 1111 fails, primarily protecting against short circuits.
[0032] By connecting the fuse groups 111 in parallel and then connecting them between the high-voltage side coil 2 and the load switch 3, the overload protection capability of the fuse structure 1 can be effectively improved, since the total current in the parallel circuit is equal to the sum of the currents in each branch. For example, the overload fuse 1111 (model 4000380C16CBCN) used in this embodiment has a rated current of 80A. Connecting two fuse groups 111 in parallel allows the two fuse groups 111 to withstand a maximum overload current of 160A, which still has sufficient safety margin compared to the rated current (112.96A) of the high-voltage side of a large-capacity transformer (capacity 6750kVA). Furthermore, Since each fuse group 111 includes an overload fuse 1111 and a backup fuse 1112 connected in series, when applied to a large-capacity transformer (capacity of 6750kVA), the overload fuse 1111 serves as the main protection, and the backup fuse 1112 serves as a backup. It intervenes to provide protection when the overload fuse 1111 fails. This can significantly improve the overall breaking capacity of the transformer when dealing with high short-circuit circuits in large-capacity transformers. This solves the problem that the existing fuse structure has a small safety margin compared to the rated current on the high-voltage side of large-capacity transformers, and is prone to overload fuse malfunction due to current fluctuations in actual operation, causing unplanned transformer tripping and affecting power supply reliability.
[0033] Furthermore, since each of the fuse groups 111 is connected in parallel, when the overload fuse 1111 or the backup fuse 1112 in one of the fuse groups 111 fails, the other fuse groups 111 connected in parallel can still provide protection for the transformer, thus preventing the fuse structure 1 from being completely unprotected and affecting the reliability of power supply.
[0034] Specifically, optionally, the number of fuse assemblies 11 can be set to multiple, and the number of fuse assemblies 11 corresponds to the number of coils included in the high-voltage side coil 2.
[0035] Please see Figure 2 Furthermore, one end of the overload fuse 1111 in the fuse group 111 is connected to the lead-out end of the high-voltage side coil 2, the other end of the overload fuse 1111 is connected to one end of the corresponding backup fuse 1112, and the other end of the backup fuse 1112 is connected to the load switch 3.
[0036] Since the overload fuse 1111 is mainly for overload current protection and takes priority action under low current, the backup fuse 1112 is used to deal with more serious faults, mainly for short circuit protection. The load switch 3 provides overload or manual disconnection functions. By connecting the overload fuse 1111 to the side closer to the high-voltage side coil 2, when a current overload occurs on the high-voltage side, the overload fuse 1111 can quickly sense the temperature rise and melt quickly, thereby cutting off the circuit to isolate the fault and prevent the fault from spreading to the entire power system. Although the load switch 3 has the ability to interrupt load current, excessively high short circuit current may exceed its rated breaking capacity. By connecting the backup fuse 1112 to the side closer to the load switch 3, the load switch 3 can be prevented from being damaged by overload during a short circuit.
[0037] Please see Figure 2 Furthermore, the number of fuse groups 111 in the fuse assembly 11 is two.
[0038] The fuse assembly 11 of this invention includes two fuse groups 111 connected in parallel. This reduces production and maintenance costs while meeting the basic requirements of current large-capacity transformers (6750kVA). It also simplifies installation, wiring, and connection operations. Furthermore, fewer fuse groups 111 occupy less space inside the transformer, optimizing the overall transformer structure. Optionally, the fuse assembly 11 can also include more than two fuse groups 111. When the overload fuse 1111 or the backup fuse 1112 in some of the fuse groups 111 fails, the other fuse groups 111 connected in parallel can still provide protection for the transformer, preventing the fuse structure 1 from completely failing and affecting power supply reliability.
[0039] Please see Figure 1 and Figure 4 The present invention also proposes a transformer, including a fuse structure 1 as described in any one of the above, wherein the high-voltage side coil 2 includes an A-phase coil 21, a B-phase coil 22 and a C-phase coil 23, and the connection method between the A-phase coil 21, the B-phase coil 22 and the C-phase coil 23 is a D connection.
[0040] The number of fuse assemblies 11 is three, and the three fuse assemblies 11 are respectively connected to the A-phase coil 21, the B-phase coil 22 and the C-phase coil 23;
[0041] Please see Figure 1 and Figure 2The load switch 3 is provided with an access point 31 and a lead-out point 32. The access point 31 is respectively set to correspond one-to-one with the A-phase coil 21, the B-phase coil 22 and the C-phase coil 23. The lead-out point 32 is respectively set to correspond one-to-one with the A-phase coil 21, the B-phase coil 22 and the C-phase coil 23.
[0042] The A-phase coil 21 includes an A-phase coil start and an A-phase coil end; the B-phase coil 22 includes a B-phase coil start and a B-phase coil end; and the C-phase coil 23 includes a C-phase coil start and a C-phase coil end.
[0043] The start of phase A coil, the start of phase B coil, and the start of phase C coil are respectively connected to one end of the corresponding fuse assembly 11. The other end of the fuse assembly 11 is connected to the access point 31 of the load switch 3. The lead-out point 32 of the load switch 3 is connected to the high-voltage bushing 4.
[0044] For specific wiring instructions, please refer to [link / reference]. Figure 1 and Figure 2 It should be noted that the wiring method between the A-phase coil 21, the B-phase coil 22, and the C-phase coil 23 is a D-connection, that is, the tail end of the A-phase coil is connected to the head end of the B-phase coil, the tail end of the B-phase coil is connected to the head end of the C-phase coil, and the tail end of the C-phase coil is connected to the head end of the A-phase coil. At the same time, since the head end of the A-phase coil, the head end of the B-phase coil, and the head end of the C-phase coil can be used as the lead-out terminals of the high-voltage side coil 2 and connected to the corresponding fuse assembly 11, it can be understood that the head end of the A-phase coil, the tail end of the A-phase coil, the head end of the B-phase coil, the tail end of the B-phase coil, the head end of the C-phase coil, and the tail end of the C-phase coil can all be called the lead-out terminals of the high-voltage side coil 2.
[0045] In the transformer of this utility model, each of the three-phase coils (i.e., the A-phase coil 21, the B-phase coil 22, and the C-phase coil 23) is connected to a fuse assembly 11. Each fuse assembly 11 includes at least two fuse groups 111 connected in parallel, which can effectively improve the overload protection capability. When applied to large-capacity transformers, it can significantly improve the overall breaking capacity of the transformer and cope with the high short-circuit circuit of large-capacity transformers. This solves the problem that the existing fuse structure has a small safety margin compared with the rated current of the high-voltage side of large-capacity transformers, and is prone to overload fuse malfunction due to current fluctuations in actual operation, causing unplanned transformer tripping and affecting the reliability of power supply.
[0046] Please see Figure 1 and Figure 2Furthermore, there are six high-voltage bushings 4, wherein the A-phase coil 21, the B-phase coil 22 and the C-phase coil 23 each correspond to two high-voltage bushings 4;
[0047] The lead-out point 32 of the load switch 3 includes a first lead-out point 321 and a second lead-out point 322; wherein, the fuse assembly 11 connected to the A-phase coil 21 is connected to the corresponding connection point 31, the corresponding first lead-out point 321 is connected to the corresponding high-voltage bushing 4, and the corresponding second lead-out point 322 is connected to the corresponding other high-voltage bushing 4.
[0048] For specific wiring instructions, please refer to [link / reference]. Figure 1 and Figure 2 More specifically, the wiring method between the B-phase coil 22, the corresponding fuse assembly 11, the load switch 3, and the high-voltage bushing 4 is the same as that between the A-phase coil 21, the corresponding fuse assembly 11, the load switch 3, and the high-voltage bushing 4; the wiring method between the C-phase coil 23, the corresponding fuse assembly 11, the load switch 3, and the high-voltage bushing 4 is the same as that between the A-phase coil 21, the corresponding fuse assembly 11, the load switch 3, and the high-voltage bushing 4.
[0049] The transformer of this invention has three-phase coils (i.e., A-phase coil 21, B-phase coil 22 and C-phase coil 23) independently configured with fuse assembly 11, load switch 3 (with corresponding access point 31, first lead-out point 321 and second lead-out point 322 respectively) and two corresponding high-voltage bushings 4, which can realize single-phase disconnection in case of single-phase fault without affecting the normal operation of the other two phases.
[0050] Please see Figures 3 to 5 Furthermore, the transformer also includes a housing 5, and the high-voltage side coil 2, the load switch 3, the high-voltage bushing 4 and the fuse assembly 11 are all disposed inside the housing 5, and the high-voltage side coil 2, the load switch 3 and the fuse assembly 11 are all located on the upper side of the high-voltage side coil 2;
[0051] The fused wire structure 1 also includes a fixing structure 12, which includes a supporting wooden structure 121 and a clamping wooden structure 122. The supporting wooden structure 121 is spaced apart along the length of the box 5, and both ends of the supporting wooden structure 121 are fixedly connected to the inner sidewall of the box 5.
[0052] The clamping wood structure 122 is spaced apart along the length of the supporting wood structure 121. One end of the clamping wood structure 122 is fixedly connected to the upper end face of one of the supporting wood structures 121, and the other end of the clamping wood structure 122 is fixedly connected to the upper end face of another supporting wood structure 121. The clamping wood structure 122 and the supporting wood structure 121 are arranged perpendicular to each other.
[0053] Please see Figures 6 to 7 The clamping wooden structure 122 has three sets of clamping spaces 1221 inside, and each set of clamping spaces 1221 includes two clamping ports 12211 spaced apart from top to bottom. The clamping ports 12211 are used to fix and install the backup fuse 1112.
[0054] The three sets of clamping spaces 1221 are distributed along the length of the clamping wooden structure 122, and the three sets of clamping spaces 1221 are respectively set to correspond one-to-one with the three fuse assemblies 11.
[0055] Specifically, since each set of clamping spaces 1221 includes two clamping ports 12211 arranged from top to bottom, and the three sets of clamping spaces 1221 are respectively arranged in a one-to-one correspondence with the three sets of fuse assemblies 11, it can be understood that the two backup fuses 1112 in the same fuse assembly 11 are vertically distributed (i.e., see [reference]). Figure 6 The two backup fuses 1112 that are vertically distributed are connected in parallel. The inlet and outlet ends of the backup fuses 1112 can be led out in the vertical direction. When two backup fuses 1112 in the same fuse assembly 11 are connected, the wiring between the two backup fuses 1112 will not interfere with each other, which can reduce the overlap of wiring paths (if the two backup fuses 1112 are side by side on the same horizontal plane, the wiring paths are likely to overlap and cross during the process of connecting the two backup fuses 1112 in parallel and then leading them out to the load switch 3).
[0056] Please see Figures 6 to 7 Furthermore, the clamping wood structure 122 includes a first clamping wood 1222, a second clamping wood 1223, and a third clamping wood 1224;
[0057] The first clamping wood 1222 is fixedly connected to the upper end face of the supporting wood structure 121, and the first clamping wood 1222, the second clamping wood 1223 and the third clamping wood 1224 are detachably connected from bottom to top.
[0058] The upper end face of the first clamping wood 1222 is provided with a first notch 12221, and the lower end face of the second clamping wood 1223 is provided with a second notch 12231 corresponding to the first notch 12221. The first notch 12221 and the second notch 12231 enclose each other to form a clamping opening 12211 in a set of clamping spaces 1221.
[0059] The lower end face of the third clamping wood 1224 is provided with a third notch 12241, and the third notch 12241 and the first notch 12221 are positioned correspondingly. The upper end face of the second clamping wood 1223 is provided with a fourth notch 12232 corresponding to the third notch 12241. The third notch 12241 and the fourth notch 12232 enclose each other to form another clamping opening 12211 in the corresponding clamping space 1221.
[0060] By setting the first notch 12221, the second notch 12231, the third notch 12241, and the fourth notch 12232 to respectively form the clamping opening 12211, the backup fuse 1112 can be accurately installed into the corresponding clamping opening 12211. Furthermore, the clamping wood structure 122 is a layered structure (including the first clamping wood 1222, the second clamping wood 1223, and the third clamping wood 1224), which helps to better clamp the backup fuse 1112 and can prevent the backup fuse 1112 from becoming loose due to vibration during transformer operation.
[0061] Please see Figures 6 to 7 Furthermore, the fixing structure 12 also includes a first tie rod 123, a second tie rod 124, and several bolts;
[0062] One end of the first pull rod 123 is fixedly connected to the bolt, and the other end of the first pull rod 123 passes through the first clamping wood 1222, the second clamping wood 1223 and the third clamping wood 1224 in sequence before being fixedly connected to another bolt;
[0063] One end of the second pull rod 124 is fixedly connected to the bolt, and the other end of the second pull rod 124 passes through the first clamping wood 1222 and the supporting wood structure 121 in sequence before being fixedly connected to another bolt.
[0064] Specifically, there are multiple first pull rods 123, which are distributed along the length of the third clamping wood 1224, which helps to better fix the first clamping wood 1222, the second clamping wood 1223 and the third clamping wood 1224, thereby better clamping the backup fuse 1112; the first clamping wood 1222, the second clamping wood 1223 and the third clamping wood 1224 are respectively provided with multiple first through holes for the first pull rods 123 to pass through.
[0065] The number of second pull rods 124 is also provided in multiples, and the multiple pull rods are distributed at both ends of the first clamping wood 1222. The first clamping wood 1222 and the supporting wood structure 121 are respectively provided with multiple second through holes for the second pull rods 124 to pass through.
[0066] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.
Claims
1. A fuse structure applied to a transformer, the transformer comprising a high-voltage side coil, a load switch, and a high-voltage bushing, characterized in that, The fuse structure includes a fuse assembly, the lead end of the high-voltage side coil is connected to one end of the fuse assembly, the other end of the fuse assembly is connected to one end of the load switch, and the other end of the load switch is connected to the high-voltage bushing. The fuse assembly includes at least two fuse groups, each fuse group being connected in parallel; each fuse group includes an overload fuse and a backup fuse, and the overload fuse and the corresponding backup fuse are connected in series.
2. The fuse structure according to claim 1, characterized in that, One end of the overload fuse in the fuse group is connected to the lead-out terminal of the high-voltage side coil, the other end of the overload fuse is connected to one end of the corresponding backup fuse, and the other end of the backup fuse is connected to the load switch.
3. The fuse structure according to claim 2, characterized in that, The number of fuse groups in the fuse assembly is two.
4. A transformer, characterized in that, Including the fuse structure as described in any one of claims 1 to 3, the high-voltage side coil includes an A-phase coil, a B-phase coil, and a C-phase coil, and the wiring method between the A-phase coil, the B-phase coil, and the C-phase coil is a D-connection; The number of fuse assemblies is set to three, and the three fuse assemblies are respectively connected to the A-phase coil, the B-phase coil and the C-phase coil; The load switch is provided with connection points and lead-out points. The connection points are respectively set to correspond one-to-one with the A-phase coil, the B-phase coil and the C-phase coil, and the lead-out points are respectively set to correspond one-to-one with the A-phase coil, the B-phase coil and the C-phase coil. The A-phase coil includes an A-phase coil start and an A-phase coil end; the B-phase coil includes a B-phase coil start and a B-phase coil end; and the C-phase coil includes a C-phase coil start and a C-phase coil end. The start end of phase A coil, the start end of phase B coil, and the start end of phase C coil are respectively connected to one end of the corresponding fuse assembly, and the other end of the fuse assembly is connected to the access point of the load switch. The lead-out point of the load switch is connected to the high-voltage bushing.
5. The transformer according to claim 4, characterized in that, The number of high-voltage bushings is six, wherein the A-phase coil, the B-phase coil, and the C-phase coil each correspond to two high-voltage bushings; The load switch has a first lead-out point and a second lead-out point; wherein the fuse assembly connected to the A-phase coil is connected to the corresponding connection point, the first lead-out point is connected to the corresponding high-voltage bushing, and the second lead-out point is connected to the corresponding other high-voltage bushing.
6. The transformer according to claim 4, characterized in that, The transformer also includes a housing, in which the high-voltage side coil, the load switch, the high-voltage bushing, and the fuse assembly are all housed, and the high-voltage side coil, the load switch, and the fuse assembly are all located above the high-voltage side coil. The fuse structure also includes a fixing structure, which includes a supporting wooden structure and a clamping wooden structure. The supporting wooden structures are spaced apart along the length of the box, and both ends of the supporting wooden structures are fixedly connected to the inner sidewall of the box. The clamping wooden structures are spaced apart along the length of the supporting wooden structures. One end of the clamping wooden structure is fixedly connected to the upper end face of one of the supporting wooden structures, and the other end of the clamping wooden structure is fixedly connected to the upper end face of another supporting wooden structure. The clamping wooden structures and the supporting wooden structures are arranged perpendicular to each other. The clamping wooden structure has three sets of clamping spaces inside, and each set of clamping spaces includes two clamping ports spaced apart from top to bottom. The clamping ports are used to fix and install the backup fuse. The three sets of clamping spaces are distributed along the length of the clamping wooden structure, and the three sets of clamping spaces are respectively set to correspond one-to-one with the three fuse assemblies.
7. The transformer according to claim 6, characterized in that, The clamping wood structure includes a first clamping wood, a second clamping wood, and a third clamping wood; The first clamping wood is fixedly connected to the upper end face of the supporting wood structure, and the first clamping wood, the second clamping wood and the third clamping wood are detachably connected from bottom to top; The upper end face of the first clamping wood is provided with a first notch, and the lower end face of the second clamping wood is provided with a second notch corresponding to the first notch. The first notch and the second notch together form a clamping opening in a set of clamping spaces. The lower end face of the third clamping wood is provided with a third notch, and the third notch is positioned corresponding to the first notch. The upper end face of the second clamping wood is provided with a fourth notch corresponding to the third notch. The third notch and the fourth notch together form another clamping opening in the corresponding clamping space.
8. The transformer according to claim 7, characterized in that, The fixing structure also includes a first tie rod, a second tie rod, and several bolts; One end of the first pull rod is fixedly connected to the bolt, and the other end of the first pull rod passes through the first clamping wood, the second clamping wood and the third clamping wood in sequence before being fixedly connected to another bolt; One end of the second tie rod is fixedly connected to the bolt, and the other end of the second tie rod passes through the first clamping wood and the supporting wood structure in sequence before being fixedly connected to another bolt.