External current transformer and GIS

Abstract

The utility model belongs to the technical field of current transformers, and particularly provides an external current transformer and a GIS. The external current transformer comprises a circuit breaker connecting plate, an isolating switch connecting plate and three branch box cylinders, one end of each branch box cylinder is fixedly connected with one of the circuit breaker connecting plate and the isolating switch connecting plate, and the other end of each branch box cylinder is sleeved with an insulating ring and is in bolt connection with the other one of the circuit breaker connecting plate and the isolating switch connecting plate through the insulating ring. The size of a bolt hole for a bolt to penetrate through is larger than the diameter of the bolt, so that normal installation of the bolt is met by adjusting the position of the bolt in the bolt hole. The GIS comprises the external current transformer provided by the utility model. As the size of the bolt hole on the insulating ring is larger than the diameter of the bolt, when the other connecting plate is assembled, the position of the bolt in the bolt hole can be finely adjusted according to the actual assembling position of the sub-box cylinder, so that the bolt can normally penetrate into the threaded hole on the connecting plate, and the yield of products is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of current transformer, especially relates to a kind of external current transformer and GIS. BACKGROUND

[0002] With the rapid development of power grid construction, GIS (gas insulated metal-enclosed switchgear) is widely used with its compact structure, strong environmental tolerance, high safety and reliability, and current transformer, as an important detection equipment in GIS, is responsible for monitoring and protecting the operation state of GIS.

[0003] According to the working environment of the coil, the current transformer can be divided into two technical routes of built-in and external. The external current transformer refers to the current transformer whose coil is located outside the SF6 gas chamber. Its structure is relatively simple and convenient to manufacture and install. For example, the patent for invention with the authorization announcement number CN113871176B discloses an external current transformer, which includes two flanges (connecting plates provided with bolt holes), three sub-box cylinders, a protective cover and the like. The two flanges are connected and fixed by a fixing rod. The two ends of the sub-box cylinder are sealingly connected with the two flanges respectively. One of the flanges (i.e. the left flange) can be connected with a circuit breaker, and the other flange (i.e. the right flange) is connected with a common box cylinder (i.e. an adapter cylinder). Both of the flanges are provided with conductive rod perforations (through holes) corresponding to the positions of the sub-box cylinders. The conductive rods pass through the inside of the sub-box cylinder. The conductive rods pass through the two flanges and the sub-box cylinder and are connected with the conversion conductor located in the common box cylinder. The coil is arranged outside the sub-box cylinder.

[0004] The above-mentioned external current transformer realizes the conversion from common box to sub-box and electrically isolates the sub-box shell to ensure that the current transformer can effectively monitor the primary current. As for how the sub-box cylinder and the two flanges are sealingly connected, the above-mentioned patent provides two forms. One is that the sub-box cylinder and one of the flanges (the right flange) are integrally cast into shape. After the coil is installed, the other end of the sub-box cylinder is connected with the other flange (the left flange) through an insulating ring. The insulating ring and the flange are bolted. The inner periphery of the insulating ring is sealingly fitted with the sub-box cylinder, and the end part is sealingly fitted with the flange (the left flange). The other is that the sub-box cylinder and the two flanges are separately processed. When assembling, the one end of the sub-box cylinder is connected with one of the flanges. The connection mode can adopt bolt connection or welding. After the coil is installed, the other end of the sub-box cylinder is connected with the other flange through an insulating ring. The inner periphery of the insulating ring is sealingly fitted with the sub-box cylinder, and the end part is sealingly fitted with the flange (the left flange). The insulating ring and the flange are bolted.

[0005] In the above two forms, the one-piece casting forming mode has higher requirements for processing precision and mold manufacturing level, and has higher cost. The split-box cylinder and flange plate split processing and reassembling mode has lower cost, but there is inevitable error in the assembling process, especially for the welding case of the split-box cylinder and the flange plate. After the split-box cylinder is welded and the insulating ring is sleeved on the split-box cylinder, due to the position deviation of the split-box cylinder, the bolt holes at the connecting position of the insulating ring and the flange plate may not be able to be penetrated by the connecting bolts in the case of large error, thereby causing the insulating ring and the flange plate to be unable to be connected, and affecting the product yield. Content of the utility model

[0006] The utility model discloses an external current transformer to solve the low product yield caused by the assembling error of the split-box cylinder and the flange split processing and reassembling current transformer in the prior art. The utility model also discloses a GIS using the external current transformer to solve the same technical problem.

[0007] To achieve the above object, the technical scheme of the external current transformer provided by the utility model is as follows:

[0008] An external current transformer comprises a circuit breaker connecting plate, an isolating switch connecting plate and three split-box cylinders, one end of each split-box cylinder is fixedly connected with one of the circuit breaker connecting plate and the isolating switch connecting plate, the other end of each split-box cylinder is sleeved with an insulating ring, and each split-box cylinder is bolted with the other one of the circuit breaker connecting plate and the isolating switch connecting plate through the insulating ring. The bolt hole provided on the insulating ring for the bolt to pass through is larger than the diameter of the bolt, so that the normal installation of the bolt can be met by adjusting the position of the bolt in the bolt hole.

[0009] As a further improvement, the insulating ring comprises a large-diameter section and a small-diameter section. The diameter of the through hole provided on the connecting plate corresponding to the position of each split-box cylinder is larger than the outer diameter of the small-diameter section, and the small-diameter section penetrates into the through hole. The bolt hole is provided on the large-diameter section.

[0010] As a further improvement, the end face of the small-diameter section is flush with the end face of the connecting plate connected therewith.

[0011] As a further improvement, the end face of the split-box cylinder exceeds the end face of the small-diameter section.

[0012] As a further improvement, a gasket is further provided between the bolt and the insulating ring.

[0013] As a further improvement, the sealing structure between the insulating ring and the connecting plate connected therewith is provided in the following manner: a sealing ring groove is provided on the connecting plate, and a sealing ring is installed in the sealing ring groove.

[0014] As a further improvement, the sealing structure between the insulation ring and the compartment cylinder is arranged in the following manner: a sealing ring groove is arranged on the compartment cylinder, and a sealing ring is arranged in the sealing ring groove.

[0015] As a further improvement, the end of the compartment cylinder away from the insulation ring is welded to the corresponding connecting plate.

[0016] As a further improvement, one end of the compartment cylinder is connected to the circuit breaker connecting plate, and the other end is bolted to the disconnecting switch connecting plate through the insulation ring.

[0017] The utility model belongs to the improved invention creation, its beneficial effect is: compared with prior art, in the utility model, when installing the insulation ring, even if there is an error in the compartment cylinder assembly, because the size of the bolt hole on the insulation ring is larger than the diameter of the bolt, when assembling the other connecting plate, the position of the bolt in the bolt hole can be adjusted according to the actual assembly position of the compartment cylinder, to ensure that the bolt can normally pass through the threaded hole on the connecting plate, and then adapt to the assembly error of the compartment cylinder, thereby improving the yield of the product.

[0018] To achieve the above object, the technical scheme of the GIS provided by the utility model is:

[0019] A GIS, comprising a circuit breaker, a disconnecting switch and an external current transformer connected between the circuit breaker and the disconnecting switch, the external current transformer comprising a circuit breaker connecting plate, a disconnecting switch connecting plate and three compartment cylinders, each compartment cylinder being fixedly connected at one end to one of the circuit breaker connecting plate and the disconnecting switch connecting plate and having an insulation ring sleeved at the other end, and being bolted to the other one of the circuit breaker connecting plate and the disconnecting switch connecting plate through the insulation ring, the bolt hole provided on the insulation ring for the bolt to pass through having a size larger than the diameter of the bolt, so as to adjust the position of the bolt in the bolt hole to meet the normal installation of the bolt.

[0020] As a further improvement, the insulation ring comprises a large-diameter section and a small-diameter section, the diameter of the through hole provided on the connecting plate to which the insulation ring is connected and corresponding to each compartment cylinder is larger than the outer diameter of the small-diameter section, the small-diameter section is inserted into the through hole, and the bolt hole is arranged on the large-diameter section.

[0021] As a further improvement, the end face of the small-diameter section is flush with the end face of the connecting plate connected thereto.

[0022] As a further improvement, the end face of the compartment cylinder exceeds the end face of the small-diameter section.

[0023] As a further improvement, a gasket is further arranged between the bolt and the insulation ring.

[0024] As a further improvement, the sealing structure between the insulation ring and the connecting plate connected with the insulation ring is arranged in the following manner: a sealing ring groove is arranged on the connecting plate, and a sealing ring is installed in the sealing ring groove.

[0025] As a further improvement, the sealing structure between the insulation ring and the connecting plate connected with the insulation ring is arranged in the following manner: a sealing ring groove is arranged on the connecting plate, and a sealing ring is installed in the sealing ring groove.

[0026] As a further improvement, the end of the sub-tank cylinder away from the insulation ring is welded on the corresponding connecting plate.

[0027] As a further improvement, one end of the sub-tank cylinder is connected with the circuit breaker connecting plate, and the other end is bolted with the disconnecting switch connecting plate through the insulation ring.

[0028] The utility model belongs to the improved invention creation, its beneficial effect is: compared with prior art, in the utility model, when installing the insulation ring, even if there is error in the sub-tank cylinder assembly, because the size of the bolt hole on the insulation ring is greater than the diameter of the bolt, when assembling another connecting plate, the position of the bolt in the bolt hole can be adjusted according to the actual assembly position of the sub-tank cylinder, to ensure that the bolt can normally pass into the threaded hole on the connecting plate, and then adapt to the assembly error of the sub-tank cylinder, thereby improving the yield of the product. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the sectional view of the external current transformer embodiment in the utility model;

[0030] Figure 2 It is the sectional view of the external current transformer embodiment in the utility model; Figure 1 It is the sectional view of the external current transformer embodiment in the utility model;

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 1, circuit breaker connecting plate;2, fixed rod;3, disconnecting switch connecting plate;4, common tank cylinder;5, conversion conductor;6, protective cover;7, coil;8, sub-tank cylinder;9, conductive rod;10, insulation ring;11, radial sealing ring;12, end face sealing ring;13, fastening bolt;100, circuit breaker;200, disconnecting switch. DETAILED DESCRIPTION

[0033] The sub-tank cylinder and the connecting plate (including the circuit breaker connecting plate for connecting the circuit breaker and the disconnecting switch connecting plate for connecting the disconnecting switch) are respectively manufactured and assembled, and the cost is lower. However, when the sub-tank cylinder and one of the connecting plates are connected, and then the other connecting plate is connected through the insulation ring, due to the assembly error, in the case of large error, the insulation ring which plays the role of connection and sealing cannot be connected with the other connecting plate, resulting in low product yield.

[0034] In order to solve the above problems, the basic technical idea of the utility model is to improve the structure of the bolt hole through which the connecting bolt passes on the insulating ring, appropriately increase the size of the bolt hole, so that the size of the bolt hole is larger than the diameter of the bolt. In this way, when the insulating ring is installed, even if there is a position error in the sub-tank cylinder, because the bolt hole is larger, the bolt hole can still have a partial area that can match the threaded hole on the connecting plate. In other words, the bolt can adjust the position in the bolt hole at this time, so that the error of the sub-tank cylinder can be compensated for, the insulating ring and the connecting plate can be normally connected, and the product yield can be improved. The utility model will be further described in detail in combination with the embodiments.

[0035] The specific embodiment of the external current transformer provided by the utility model is as follows:

[0036] The structure of the external current transformer provided in the embodiment is installed behind the GIS and can be referred to as Figure 1 , which comprises a circuit breaker connecting plate 1, three sub-tank cylinders 8, a disconnecting switch connecting plate 3, the circuit breaker connecting plate 1 can be used to connect the circuit breaker 100, and specifically can be a flange plate, the disconnecting switch connecting plate 3 is used to connect the disconnecting switch 200, and specifically can also be a flange plate. Of course, in the case of being provided with the common tank cylinder 4, in fact, the disconnecting switch connecting plate 3 is connected with the disconnecting switch 200 through the common tank cylinder 4. The disconnecting switch connecting plate 3 and the circuit breaker connecting plate 1 are fixedly connected through the fixing rod 2. The three sub-tank cylinders 8 are each externally sleeved with a coil 7, the inside of which is passed through by a conductive rod 9 connected with the outgoing conductor of the circuit breaker 100, the conductive rod 9 passes through the sub-tank cylinder 8 and is connected with the insulating pot of the disconnecting switch 200 through the conversion conductor 5. The basic working principle of the external current transformer is consistent with the prior art, and details are not repeated here.

[0037] The two ends of the sub-tank cylinder 8 are respectively connected and sealingly matched with the disconnecting switch connecting plate 3 and the circuit breaker connecting plate 1. Specifically, one end of the sub-tank cylinder 8 is welded on the circuit breaker connecting plate 1, and the annular weld formed after welding can directly form a sealing structure, which is convenient and efficient. Of course, in other embodiments, it is also not excluded that a flange ring (which can be welded) is arranged at one end of the sub-tank cylinder 8, and the sub-tank cylinder 8 is connected with the circuit breaker connecting plate 1 by means of a bolt, but when connected, a sealing ring should be arranged between the end faces of the flange ring and the circuit breaker connecting plate 1 that are pressed against each other. After the connection between the sub-tank cylinder 8 and the circuit breaker connecting plate 1 is completed, the coil 7 can be sleeved outside the sub-tank cylinder 8, and epoxy resin is poured. The other end of the sub-tank cylinder 8 is connected and sealingly matched with the disconnecting switch connecting plate 3 through the insulating ring 10. Specifically, as Figure 2As shown, the inner periphery of the insulation ring 10 and the outer periphery of the compartment cylinder 8 are sealingly fitted, and specifically, a radial sealing ring 11 is arranged between the insulation ring 10 and the compartment cylinder 8, and in order to achieve better sealing effect, the radial sealing ring 11 is provided with two rows. One end of the insulation ring 10 and the end face of the disconnecting link plate 3 are sealingly fitted, and specifically, an end face sealing ring 12 is arranged between the insulation ring 10 and the disconnecting link plate 3.

[0038] In order to avoid excessive processing of the insulation ring 10, when the sealing ring is arranged above, the sealing ring groove for installing the radial sealing ring 11 is opened on the compartment cylinder 8, and the sealing ring groove for installing the end face sealing ring 12 is opened on the disconnecting link plate 3.

[0039] The insulation ring 10 is connected with the disconnecting link plate 3 through a fastening bolt 13, and it is not difficult to understand that the disconnecting link plate 3 is provided with a threaded hole for connecting with the fastening bolt 13, and the insulation ring 10 is provided with a bolt hole for the fastening bolt 13 to pass through. Different from the prior art, in order to ensure that the fastening bolt 13 can be smoothly installed when there is an installation error in the compartment cylinder 8, in the embodiment, the size of the bolt hole on the insulation ring 10 is greater than the diameter size of the fastening bolt 13, and when the fastening bolt 13 is tightened, the relative position of the fastening bolt 13 in the bolt hole can be adjusted to ensure that it can be smoothly connected and installed with the threaded hole on the disconnecting link plate 3, so as to press the insulation ring 10 on the disconnecting link plate 3.

[0040] In the case of a larger bolt hole, in order to ensure that the head of the fastening bolt 13 can press the insulation ring 10, in a further preferred scheme, a gasket can be arranged in front of the fastening bolt 13 and the insulation ring 10.

[0041] As a more reliable preferred scheme, in the embodiment, as shown in the figure, Figure 2 The insulation ring 10 includes a large-diameter section with a larger diameter and a small-diameter section with a smaller diameter, the disconnecting link plate 3 is provided with a through hole corresponding to the position of the compartment cylinder 8, the diameter of the through hole is greater than the outer diameter of the small-diameter section, the small-diameter section is inserted into the through hole provided by the disconnecting link plate 3, the large-diameter end is provided with the above-mentioned bolt hole and sealingly fitted with the disconnecting link plate 3.

[0042] Since the diameter of the through hole provided by the disconnecting link plate 3 is greater than the outer diameter of the small-diameter section, this also makes the insulation ring 10 adapt to the assembly error of the compartment cylinder 8, so as to be smoothly inserted into the through hole. Compared with the prior art of arranging the insulation ring 10 and the corresponding connecting plate to only abut the end face, at this time, the insulation ring 10 can separate the compartment cylinder 8 from the disconnecting link plate 3, has a more optimal insulation effect, and further improves the reliability of the current transformer.

[0043] Further preferred, the end face of the small diameter section and the end face of the disconnector connecting plate 3 are flush, it should be noted that due to inevitable installation errors, flush here should be understood as substantially flush. In this way, the compartment cylinder 8 and the disconnector connecting plate 3 can be completely separated, so that the reliability is further improved.

[0044] Further, the end face of the compartment cylinder 8 exceeds the end face of the small diameter section. In this way, the position of the radial sealing ring 11 can be as far away from the end face of the compartment cylinder 8 as possible, so as to facilitate the formation of a sealing structure with better sealing effect.

[0045] It should be noted that the above only gives an embodiment of the connection of the insulation ring 10 and the disconnector connecting plate 3, so that when assembling the external current transformer to the GIS, the external current transformer can be installed on the circuit breaker 100 first, at this time the position of the coil 7 is closer to the circuit breaker 100, and then the center of gravity of the external current transformer is closer to the circuit breaker 100, so that the external current transformer can be more stable when the disconnector 200 is assembled subsequently. However, in other embodiments, the compartment cylinder 8 can also be connected with the disconnector connecting plate 3, and connected with the circuit breaker connecting plate 1 through the insulation ring 10, wherein the insulation ring 10 is arranged between the insulation ring 10 and the circuit breaker connecting plate 1, and the arrangement mode of the insulation ring 10 is consistent with the arrangement mode of the insulation ring 10 and the disconnector connecting plate 3 in the above embodiment, which will not be described here. At this time, the external current transformer and the disconnector 200 can be assembled integrally when assembling.

[0046] The specific embodiment of the GIS in the utility model:

[0047] The GIS comprises a disconnector, an external current transformer and a circuit breaker, the external current transformer is located between the disconnector and the circuit breaker, and the specific structure of the external current transformer is consistent with the above-mentioned embodiment of the external current transformer, which will not be described in detail here.

[0048] Finally, it should be noted that the above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical scheme recorded in the foregoing embodiments can be modified without creative labor, or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An external current transformer, comprising a circuit breaker connecting plate, a disconnector connecting plate, three sub-tank cylinders, one end of each sub-tank cylinder is fixedly connected with one of the circuit breaker connecting plate and the disconnector connecting plate, the other end is sleeved with an insulating ring, and the other one of the circuit breaker connecting plate and the disconnector connecting plate is bolted through the insulating ring, characterized in that, The bolt hole provided on the insulation ring for the bolt to pass through is larger than the diameter of the bolt, so that the normal installation of the bolt can be met by adjusting the position of the bolt in the bolt hole.

2. The current transformer according to claim 1, characterized in that The insulation ring comprises a large-diameter section and a small-diameter section, the diameter of the through hole provided on the connecting plate to which the insulation ring is connected and corresponding to the position of each sectioned cylinder is larger than the outer diameter of the small-diameter section, the small-diameter section is inserted into the through hole, and the bolt hole is provided on the large-diameter section.

3. The current transformer of claim 2, wherein, The end surface of the small-diameter section is flush with the end surface of the connecting plate connected thereto.

4. The current transformer according to claim 2 or 3, characterized in that The end surface of the sectioned cylinder exceeds the end surface of the small-diameter section.

5. An external current transformer according to any one of claims 1-3, characterized in that A gasket is further provided between the bolt and the insulation ring.

6. The current transformer according to any one of claims 1 to 3, characterized in that The sealing structure between the insulation ring and the connecting plate to which the insulation ring is connected is provided in the following manner: a sealing ring groove is provided on the connecting plate, and a sealing ring is installed in the sealing ring groove.

7. The current transformer according to any one of claims 1 to 3, characterized in that The sealing structure between the insulation ring and the sectioned cylinder is provided in the following manner: a sealing ring groove is provided on the sectioned cylinder, and a sealing ring is installed in the sealing ring groove.

8. The current transformer according to any one of claims 1 to 3, characterized in that The end of the sectioned cylinder away from the insulation ring is welded to the corresponding connecting plate.

9. The current transformer according to any one of claims 1 to 3, characterized in that One end of the sectioned cylinder is connected to the circuit breaker connecting plate, and the other end is bolted to the disconnecting switch connecting plate through the insulation ring.

10. A GIS comprising a circuit breaker, a disconnector and an external current transformer connected between the circuit breaker and the disconnector, characterized in that The external current transformer is the external current transformer of any one of claims 1-9.

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