High safety fuse and voltage transformer

Abstract

The utility model belongs to the technical field of mutual inductor, disclose a kind of high safety's fuse and voltage transformer.The fuse includes main spare, spare and rotary switch;The rotary switch is electrically connected with line primary high voltage end, including conducting position and several insulation positions;The main spare and the spare are electrically connected with the different working positions in the rotary switch respectively;The main spare and the spare all include first high voltage shield, second high voltage shield, insulating cylinder and fuse main body;The insulating cylinder gap is worn in the first high voltage shield, one end of the fuse main body gap is worn in the second high voltage shield, the other end is adapted and worn in the insulating cylinder;Wherein, the outside wall of the insulating cylinder is conductive structure, and the inside wall is insulating structure.The utility model has more excellent current protection effect.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a high-safety fuse and voltage transformer. Background Technology

[0002] Industries such as construction, power, and petrochemicals all require reliable, safe, and efficient power distribution and control from power systems to ensure stable production. However, overloads and short circuits are inevitable in power systems. To address these faults promptly and prevent equipment damage, power outages, or even major safety accidents, appropriate circuit protection devices must be installed in the power system.

[0003] Specifically, a fuse is an overcurrent protection device used in voltage transformers in power systems. When an overload or short circuit occurs in the circuit, the fuse's fuse body melts, thereby cutting off the circuit and protecting equipment and personnel. In practical applications, the fuse is simply placed inside the fuse compartment of the voltage transformer, making it difficult to ensure good contact at each contact point. If the contact points are improperly installed or become loose or oxidized during use, the contact resistance will increase, leading to more heat generation when normal current flows through, degrading the performance of the surrounding insulation and causing partial discharge. Simultaneously, because the fuse located at the primary end of the voltage transformer is on the high-voltage side, the floating potential around the high-voltage end of the voltage transformer can also cause partial discharge.

[0004] Therefore, to prevent partial discharge caused by fuses from affecting the partial discharge level of voltage transformers, two high-voltage shields are usually added to the fuses to improve partial discharge. However, adding high-voltage shields introduces the following drawback: when a fuse explodes during operation, the fiberglass casing of the fuse will burn and carbonize, increasing the risk of continuity of the two high-voltage shields. This means that the voltage transformer cannot quickly cut off the current when the power system experiences severe overload or other abnormal behavior. Utility Model Content

[0005] The purpose of this utility model is to provide a highly secure fuse and voltage transformer to solve the technical problem that current voltage transformers equipped with fuses are difficult to effectively achieve current protection in practical applications.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] Firstly, a highly secure fuse is provided, comprising: a main component, a spare component, and a rotary switch;

[0008] The rotary switch is electrically connected to the primary high-voltage terminal of the line and includes a conducting position and several insulating positions; the main component and the spare component are electrically connected to different working positions of the rotary switch respectively.

[0009] Both the main component and the spare component include a first high-voltage shield, a second high-voltage shield, an insulating cylinder, and a fuse body; the insulating cylinder is gapped through the first high-voltage shield, one end of the fuse body is gapped through the second high-voltage shield, and the other end is adapted to be inserted through the insulating cylinder; wherein, the outer side wall of the insulating cylinder is a conductive structure, and the inner side wall is an insulating structure.

[0010] Furthermore, it includes a conductive fixing part; the conductive fixing part includes a first fixing member and a terminal; the first fixing member passes through both the insulating cylinder and the first high-voltage shield to fix both, and its end protrudes from the first high-voltage shield; the terminal is sleeved on the protruding end of the first fixing member and is electrically connected to the primary high-voltage input terminal of the primary winding through a wire.

[0011] Furthermore, it includes a sleeve and a second fixing member; the second high-voltage shield is a cylindrical structure, the sleeve is sleeved and fixed to the end of the second high-voltage shield away from the first high-voltage shield, and the second fixing member passes through the second high-voltage shield and is threadedly engaged with the sleeve;

[0012] The second fixing member has several mounting holes spaced apart at its unused end, and a support rod is detachably inserted into each mounting hole.

[0013] Furthermore, it includes a first limiting groove; the first limiting groove is opened at the end of the second fixing member near the second high-voltage shield, and one end of the fuse body is placed in the first limiting groove.

[0014] Furthermore, it includes a second limiting groove; the second limiting groove is fixed to the inner end face of the insulating cylinder, and the other end of the fusion body is placed in the second limiting groove.

[0015] Furthermore, it includes an elastic element, which is fixed to the inner end face of the insulating cylinder by its end, and the end of the fusion body adapted to pass through the insulating cylinder is press-fitted with the unused end of the elastic element.

[0016] Furthermore, the insulating cylinder is a resin cylinder, and the outer wall of the resin cylinder is covered with a shielding buffer layer.

[0017] Furthermore, the thickness of the insulating cylinder is positively correlated with the voltage value of the primary input voltage.

[0018] Furthermore, the fuse body, the first high-voltage shield, the second high-voltage shield, and the insulating cylinder are all coaxially arranged.

[0019] Secondly, this technical solution provides a voltage transformer, including the aforementioned high-safety fuse.

[0020] Beneficial effects:

[0021] This invention provides a highly secure fuse to address the shortcomings of current fuses that cannot effectively provide current protection. It includes a main component, a spare component, and a rotary switch that work together.

[0022] The rotary switch is electrically connected to the primary high-voltage terminal of the line, including a conducting position and several insulating positions; the main component and the spare component are electrically connected to different working positions of the rotary switch respectively. Both the main component and the spare component include a first high-voltage shield, a second high-voltage shield, an insulating cylinder, and a fuse body; the insulating cylinder is gapped inside the first high-voltage shield, one end of the fuse body is gapped inside the second high-voltage shield, and the other end is adapted to pass through the insulating cylinder; wherein, the outer wall of the insulating cylinder is a conductive structure, and the inner wall is an insulating structure.

[0023] Based on the fuse described in this technical solution, on the one hand, from an overall perspective, when the fuse in the main component blows, the main component can be switched to the insulating position with the help of a rotary switch, and the spare component can be switched to the conducting position after the circuit is normalized. This avoids the situation where the current cannot be effectively cut off due to the breakage of the main component, and provides rapid current-coordinated protection when the circuit is normal. On the other hand, from a local perspective, an insulating cylinder is set inside the first high-voltage shield to completely isolate the fuse body from the first high-voltage shield. At this time, the carbonized shell after the fuse body explodes is effectively constrained within the insulating cylinder, avoiding indirect conduction between the two high-voltage shield sections and ensuring rapid current cutoff. At the same time, the outer surface of the insulating cylinder is made into a conductive structure to conduct with the first high-voltage shield, thereby providing double shielding of the primary high-voltage end, reducing partial discharge, and improving safety.

[0024] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0025] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0026] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0027] Fig. 1 This is a schematic diagram of the voltage transformer described in this embodiment;

[0028] Fig. 2 This is a schematic diagram of the structure of one end of the main component or spare component in the high-safety fuse described in this embodiment;

[0029] Fig. 3 This is a schematic diagram of the structure of the other end of the main component or spare component in the high-safety fuse described in this embodiment;

[0030] Fig. 4 This is a schematic diagram of the structure of the second fastener described in this embodiment.

[0031] The attached figures are labeled as follows:

[0032] 01 is a rotary switch, 02 is the main component, 03 is a spare component, 04 is the main body of the current transformer, 05 is the first high-voltage shield, 06 is an insulating cylinder, 07 is the second limiting groove, 08 is an elastic element, 09 is the first fixing element, 10 is a terminal, 11 is a sleeve, 12 is the second fixing element, 13 is the fuse body, 14 is the primary high-voltage terminal of the line, 15 is the second high-voltage shield; 12a is a mounting hole, and 12b is the first limiting groove. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0034] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] A fuse is an overcurrent protection device used in voltage transformers in power systems. When an overload or short circuit occurs in the circuit, the fuse's fuse element melts, thereby cutting off the circuit and protecting equipment and personnel. To prevent partial discharge of the fuse from affecting the partial discharge level of the entire transformer, a high-voltage shield is required. However, the use of a high-voltage shield can cause the circuit to continue conducting even after the fuse has blown, thus failing to achieve the purpose of current protection. Therefore, this embodiment aims to provide a highly safe fuse to solve the above-mentioned technical problems.

[0036] The highly secure fuse disclosed in this utility model will be further described in detail below with reference to the embodiments shown in the accompanying drawings.

[0037] Combination Figs. 1-4 As shown, the fuse described in this embodiment includes a main component 02, a spare component 03, and a rotary switch 01 that cooperate with each other.

[0038] Specifically, the rotary switch 01 is electrically connected to the primary high-voltage terminal 14 of the line and includes the following operating positions: one conducting position and several insulating positions. In this embodiment, it includes two insulating positions. The main component 02 and the spare component 03 are electrically connected to different operating positions of the rotary switch 01 respectively.

[0039] Both the main component 02 and the spare component 03 include a first high-voltage shield 05, a second high-voltage shield 15, an insulating cylinder 06, and a fuse body 13. The insulating cylinder 06 is gapped inside the first high-voltage shield 05, and one end of the fuse body 13 is gapped inside the second high-voltage shield 15, while the other end is fitted inside the insulating cylinder 06. In specific implementations, the distance between adjacent ends of the first high-voltage shield 05 and the second high-voltage shield 15 ranges from 20mm to 30mm. The outer wall of the insulating cylinder 06 is conductive, and the inner wall is insulating.

[0040] In specific implementation, a conductive fixing part is also included. The conductive fixing part includes a first fixing member 09 and a terminal 10. The first fixing member 09 passes through both the insulating cylinder 06 and the first high-voltage shield 05 to fix them together, and its end protrudes beyond the first high-voltage shield 05. The terminal 10 is sleeved on the protruding end of the first fixing member 09 and is electrically connected to the primary high-voltage input terminal of the primary winding through a wire.

[0041] In practical implementation, on the one hand, considering the overall situation, when the fuse in main component 02 blows, main component 02 can be switched to the insulating position with the help of a rotary switch. After the circuit returns to normal, spare component 03 can be switched to the conducting position to avoid the situation where the current is difficult to effectively cut off due to carbonization of the fuse shell in main component 02, and to quickly perform current-coordinated protection when the circuit is normal. Specifically, when the circuit is abnormal, main component 02 and spare component 03 are switched to the insulating position simultaneously. Then, when the circuit returns to normal, spare component 03 is switched to the conducting position, and the fuse in main component 02 is replaced in the insulating position. On the other hand, from a local perspective, an insulating cylinder 06 is installed inside the first high-voltage shield 05. The interior of the insulating cylinder 06 is designed as an insulating structure. The insulating cylinder 06, with its certain thickness, forms an insulating layer between the first high-voltage shield 05 and the fuse body 13, completely isolating the fuse from the first high-voltage shield 05. The carbonized outer shell of the fuse after rupture is confined within the insulating cylinder 06, preventing indirect conduction between the two high-voltage shield sections and ensuring rapid current interruption. Simultaneously, since the outer surface of the insulating cylinder 06 is also made conductive, it will conduct with the first high-voltage shield 05, thus providing double shielding of the primary high-voltage end, reducing partial discharge, and improving safety.

[0042] Further preferably, the thickness of the insulating cylinder 06 is set to be positively correlated with the voltage value of the primary input voltage to ensure the effectiveness of the insulating cylinder 06. In this embodiment, when the primary input voltage is 10kV, the thickness of the insulating cylinder 06 is 6mm; when the primary input voltage is 20kV, the thickness of the insulating cylinder 06 is 10mm; and when the primary input voltage is 35kV, the thickness of the insulating cylinder 06 is 14mm.

[0043] Preferably, considering that the insulating cylinder 06 is usually made of resin, during the friction process, the resin powder loses electrons, while the first high-voltage shield 05, made of metal, gains these electrons, thus making the metal negatively charged and the resin powder positively charged; thereby generating static electricity. Based on this, a shielding buffer layer is also wrapped around the resin insulating cylinder 06 to prevent static electricity generated by friction between the first high-voltage shield 05 and the resin insulating cylinder 06. In this embodiment, the shielding buffer layer is a self-adhesive semi-conductive tape.

[0044] As another preferred embodiment, considering the prior art, built-in fuses are sealed inside the transformer fuse compartment by a primary end cover. Before replacing the fuse, the primary end cover needs to be slowly unscrewed with needle-nose pliers, and since the primary end cover is usually tightened very tightly, replacing the fuse requires a lot of time and effort. Based on this, this embodiment further includes a sleeve 11 and a second fixing member 12 in the fuse configuration. The second high-voltage shield 15 has a cylindrical structure, and the sleeve 11 is fitted and fixed to the end of the second high-voltage shield 15 away from the first high-voltage shield 05. The second fixing member 12 passes through the second high-voltage shield 15 and is threadedly engaged with the sleeve 11. At the same time, a plurality of mounting holes 12a are provided at intervals on the unused end of the second fixing member 12, and a support rod is detachably inserted into each mounting hole 12a. At this point, if it is necessary to replace the fuse body 13, simply insert the support rod 12a into each mounting hole 12a, place a stop bar between each support rod 12a, and continue to rotate the stop bar. Under the action of torque, the second fixing part 12 can be easily unscrewed to replace the fuse.

[0045] To improve the accuracy of the relative position of the fuse body 13 during installation and thus enhance safety, a first limiting groove 12b is also included. The first limiting groove 12b is located at the end of the second fixing member 12 near the second high-voltage shield 15, with one end of the fuse body 13 placed within it. Simultaneously, a second limiting groove 07 is also provided. The second limiting groove 07 is fixed to the inner end face of the insulating cylinder 06, with the other end of the fuse body 13 placed within it. In this configuration, the limiting grooves can restrict the position of the fuse body 13, preventing abnormal communication with other structures.

[0046] Similarly, the fuse body 13, the first high-voltage shield 05, the second high-voltage shield 15, and the insulating cylinder 06 are coaxially arranged, and their dimensional relationships are defined as follows: The diameter of the fuse body 13 is set to D1; the inner diameter of the second high-voltage shield 15 is D2 = D1 + 1; the inner diameter of the insulating cylinder 06 is D3 = D2 = D1 + 1; the outer diameter of the insulating cylinder 06 is D4 = D3 + 2 * T (T is the thickness of the insulating cylinder); and the inner diameter of the first high-voltage shield 05 is D5 = D4 + 1. This overall arrangement prevents circuit malfunctions caused by abnormal conduction.

[0047] As another preferred embodiment, to improve the contact quality of the fuse body 13 and reduce the generation of partial discharge at its source, the fuse is provided with an elastic element 08, which is fixed to the inner end face of the insulating cylinder 06 by one end. One end of the fuse body 13, adapted to pass through the insulating cylinder 06, is press-fitted with the unused end of the elastic element 08. In this case, good contact can be ensured by the elastic element 08.

[0048] Meanwhile, this embodiment also provides a voltage transformer, which includes a transformer body 04 and a high-safety fuse is provided on the transformer body 04. Therefore, the voltage transformer has higher safety during operation and is easier to replace the fuse body 13.

[0049] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A high-safety fuse, characterized in that, include: Main components, spare parts, and rotary switches; The rotary switch is electrically connected to the primary high-voltage terminal of the line and includes a conducting position and several insulating positions; the main component and the spare component are electrically connected to different working positions of the rotary switch respectively. Both the main component and the spare component include a first high-voltage shield, a second high-voltage shield, an insulating cylinder, and a fuse body; the insulating cylinder is gapped through the first high-voltage shield, one end of the fuse body is gapped through the second high-voltage shield, and the other end is adapted to be inserted through the insulating cylinder; wherein, the outer side wall of the insulating cylinder is a conductive structure, and the inner side wall is an insulating structure.

2. The high-safety fuse according to claim 1, characterized in that, It includes a conductive fixing part; the conductive fixing part includes a first fixing member and a terminal; the first fixing member passes through both the insulating cylinder and the first high-voltage shield to fix them, and its end protrudes from the first high-voltage shield; the terminal is sleeved on the protruding end of the first fixing member and is electrically connected to the primary high-voltage input terminal of the primary winding through a wire.

3. The high-safety fuse according to claim 1, characterized in that, It includes a sleeve and a second fixing member; the second high-voltage shield is a cylindrical structure, the sleeve is sleeved and fixed at the end of the second high-voltage shield away from the first high-voltage shield, and the second fixing member passes through the second high-voltage shield and is threadedly engaged with the sleeve; The second fixing member has several mounting holes spaced apart at its unused end, and a support rod is detachably inserted into each mounting hole.

4. The high-safety fuse according to claim 3, characterized in that, It includes a first limiting groove; the first limiting groove is opened at the end of the second fixing member near the second high voltage shield, and one end of the fuse body is placed in the first limiting groove.

5. The high-safety fuse according to claim 1, characterized in that, It includes a second limiting groove; the second limiting groove is fixed to the inner end face of the insulating cylinder, and the other end of the fuse body is placed in the second limiting groove.

6. The high-safety fuse according to claim 1, characterized in that, It includes an elastic element, which is fixed to the inner end face of the insulating cylinder by its end, and the end of the fusion body adapted to pass through the insulating cylinder is press-fitted with the unused end of the elastic element.

7. The high-safety fuse according to claim 1, characterized in that, The insulating cylinder is a resin cylinder, and the outer wall of the resin cylinder is covered with a shielding buffer layer.

8. The high-safety fuse according to claim 1, characterized in that, The thickness of the insulating cylinder is positively correlated with the voltage value of the primary input voltage.

9. The high-safety fuse according to claim 1, characterized in that, The fuse body, the first high-voltage shield, the second high-voltage shield, and the insulating cylinder are all coaxially arranged.

10. A voltage transformer, characterized in that, Including the high-safety fuse as described in any one of claims 1-9.

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