CN111696775B - Voltage transformer - Google Patents

Voltage transformer Download PDF

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Publication number
CN111696775B
CN111696775B CN202010529133.3A CN202010529133A CN111696775B CN 111696775 B CN111696775 B CN 111696775B CN 202010529133 A CN202010529133 A CN 202010529133A CN 111696775 B CN111696775 B CN 111696775B
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CN
China
Prior art keywords
connecting piece
fuse tube
voltage transformer
mutual inductor
side wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010529133.3A
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Chinese (zh)
Other versions
CN111696775A (en
Inventor
陈冠
温志宝
吴正伟
唐金水
魏兴元
冯梓军
黄学仪
徐健
陈木胜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingyuan Power Supply Bureau of Guangdong Power Grid Co Ltd
Original Assignee
Qingyuan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingyuan Power Supply Bureau of Guangdong Power Grid Co Ltd filed Critical Qingyuan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority to CN202010529133.3A priority Critical patent/CN111696775B/en
Publication of CN111696775A publication Critical patent/CN111696775A/en
Application granted granted Critical
Publication of CN111696775B publication Critical patent/CN111696775B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/54Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/24Voltage transformers
    • H01F38/26Constructions

Abstract

The invention belongs to the technical field of power transmission and transformation equipment, and discloses a voltage transformer, which comprises: the mutual inductor comprises a mutual inductor body, wherein the mutual inductor body is arranged along a Z axis; the first end of the upper connecting piece is connected to the top end of the mutual inductor body, and the second end of the upper connecting piece extends along the X-axis direction and can elastically swing along the Z-axis direction; the first end of the lower connecting piece is connected to the bottom end of the mutual inductor body, and the second end of the lower connecting piece is opposite to the second end of the upper connecting piece; the top end of the fuse tube is clamped on the upper connecting piece, and the bottom end of the fuse tube is clamped on the connecting piece. The fuse tube sets up in the outside of mutual-inductor body, need not the outage and can realize dismantling and installing, goes up the connecting piece and can follow Z axle elastic swing, and the fuse tube can earlier with last connecting piece cooperation, connects in connecting piece down again, and lower connecting piece supports the fuse tube, can make the fuse tube break away from connecting piece down earlier during the dismantlement, breaks away from the connecting piece again, the voltage transformer of this kind of structure easy to assemble and dismantles the fuse tube.

Description

Voltage transformer
Technical Field
The invention relates to the technical field of power transmission and transformation equipment, in particular to a voltage transformer.
Background
PT (voltage transformer) are all installed to present 10kV distribution lines outdoor automatic column switch, and the function of this equipment is exactly for the power that automation equipment provided 220V, and PT inside is equipped with a fuse-link, and when meetting thunder and lightning weather, circuit fault scheduling problem all probably causes the fuse-link fusing, and unable normal work needs to be changed the fuse-link.
This replacement operation necessitates a power outage to the line in operation, and the failure of the fusion tube to melt is relatively frequent, which can result in a loss of grid economy if there is a frequent power outage. The fuse tube is not replaced by a common overhauling mode, but the whole fuse tube is replaced, so that time and labor are wasted, and the power failure time is prolonged.
Disclosure of Invention
The invention aims to provide a voltage transformer to solve the problem that a fuse tube of the existing voltage transformer needs to be powered off before replacement.
In order to achieve the purpose, the invention adopts the following technical scheme:
a voltage transformer, comprising:
the mutual inductor comprises a mutual inductor body, a first connecting piece and a second connecting piece, wherein the mutual inductor body is arranged along a Z axis;
the first end of the upper connecting piece is connected to the top end of the mutual inductor body, and the second end of the upper connecting piece extends along the X-axis direction and can elastically swing along the Z-axis direction;
the first end of the lower connecting piece is connected to the bottom end of the mutual inductor body, and the second end of the lower connecting piece is opposite to the second end of the upper connecting piece;
the top end of the fuse tube is clamped and connected with the upper connecting piece, and the bottom end of the fuse tube is clamped and connected with the lower connecting piece.
The fuse tube is arranged outside the mutual inductor body through the upper connecting piece and the lower connecting piece, disassembly and assembly can be achieved without power failure, the upper connecting piece can swing along the Z axis elasticity, the fuse tube can be matched with the upper connecting piece at first, then the fuse tube is connected to the lower connecting piece, the lower connecting piece provides a supporting effect for the fuse tube, the fuse tube can be separated from the lower connecting piece firstly during disassembly operation, the upper connecting piece is separated from the voltage mutual inductor with the structure, and the fuse tube is convenient to install and disassemble.
As a preferable mode of the above voltage transformer, an elastic member is provided between the upper connecting member and the lower connecting member, and the elastic member applies a pulling force to the upper connecting member to move closer to the lower connecting member.
The elastic piece makes the upper connecting piece move towards the direction of the lower connecting piece, and then applies acting force of the lower connecting piece to the fuse tube, so that the fuse tube is prevented from being easily separated from the upper connecting piece, and the stability of the fuse tube arranged on the mutual inductor body is improved.
As a preferable scheme of the above voltage transformer, the upper connecting member includes an elastic limb and an upper clamp spring, the elastic limb has elasticity, one end of the elastic limb is connected to the transformer body, and the other end of the elastic limb can elastically swing along the Z axis and is connected to the upper clamp spring.
The elastic limb can drive the upper clamp spring to elastically move along the Z axis, and the upper clamp spring elastically moves along the Z axis through the elastic limb and can be clamped on the top end of the fuse tube, so that the installation and the disassembly are convenient.
As a preferable scheme of the above voltage transformer, the upper clamp spring has a side wall and a cassette bottom, an opening is formed at one end of the upper clamp spring away from the cassette bottom, and an inner diameter of the side wall is gradually reduced from the opening to the cassette bottom.
The inner diameter of the side wall is gradually reduced from the opening to the bottom of the clamping seat, and the top end of the fuse tube can be clamped.
As a preferable scheme of the voltage transformer, the side wall is composed of a plurality of side wall monomers, and two adjacent side wall monomers are connected with each other at one end close to the holder bottom and at a preset distance at one end far away from the holder bottom.
Because the one end interval at keeping away from the cassette bottom of a plurality of lateral wall monomers to make the lateral wall can strut to bigger scope, lead to the fuse-link easily, and the one end interconnect that the lateral wall monomer is close to the cassette bottom can not influence and presss from both sides tight fuse-link.
As a preferable mode of the above-described voltage transformer, an inner wall of each of the side wall units is provided with a lip portion extending in a circumferential direction.
The inner wall of the side wall monomer is provided with the convex lip part, so that the friction force between the side wall monomer and the fuse tube can be improved.
As a preferable scheme of the above voltage transformer, the protruding lip portions of the individual side walls are all disposed on the same annular surface, the annular surface is parallel to the surface of the base, and the fuse tube is provided with an annular groove adapted to the protruding lip portions.
The fuse tube is provided with an annular groove, and can be matched with the convex lip parts on the side wall monomers in a clamping mode, so that the connection stability is improved.
As an optimal scheme of the voltage transformer, one end of the side wall single body, which is far away from the base, is connected with a guide part, and an included angle between the guide part and the central axis of the upper clamp spring is larger than an included angle between the side wall single body and the central axis of the upper clamp spring.
The guide part of this structure can guide the fuse tube to transfer to in the last jump ring.
As a preferred embodiment of the above voltage transformer, the lower connecting member includes a connecting limb and a lower snap spring, one end of the connecting limb is connected to the lower end of the transformer body, the other end of the connecting limb can be connected to the lower snap spring, and an elastic coefficient of the connecting limb is smaller than an elastic coefficient of the elastic limb.
The connecting limbs have certain elasticity, the fuse tube is conveniently detached, the elastic coefficient of the connecting limbs is smaller than that of the elastic limbs, and when the fuse tube is installed, the connecting limbs can support the fuse tube.
As a preferable scheme of the voltage transformer, a hook is arranged on the outer wall of the fusing tube.
The fuse tube is conveniently hung and transferred between the upper connecting piece and the lower connecting piece by the hook, and the fuse tube is also convenient to detach.
The voltage transformer provided by the invention has the beneficial effects that: the fuse tube is arranged outside the mutual inductor body through the upper connecting piece and the lower connecting piece, disassembly and assembly can be achieved without power failure, the upper connecting piece can swing along the Z axis elasticity, the fuse tube can be matched with the upper connecting piece at first, then the fuse tube is connected to the lower connecting piece, the lower connecting piece provides a supporting effect for the fuse tube, the fuse tube can be separated from the lower connecting piece firstly during disassembly operation, the upper connecting piece is separated from the voltage mutual inductor with the structure, and the fuse tube is convenient to install and disassemble.
Drawings
Fig. 1 is a schematic structural diagram of a voltage transformer according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an upper connection member of a voltage transformer in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an upper clamp spring of the voltage transformer according to the embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a sidewall monomer of the upper clamp spring shown in FIG. 3;
fig. 5 is a schematic structural view of a lower connection member of a voltage transformer according to an embodiment of the present invention.
In the figure:
1-a transformer body; 2-upper connecting piece; 3-lower connecting piece; 4-fusing the tube; 5-an elastic member;
21-elastic limb; 22-mounting a clamp spring; 221-side wall; 221A-raised lip portion; 222-a cartridge base; 223-a guide;
31-connecting limbs; 32-lower clamp spring;
and 40-hanging hooks.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The invention provides a voltage transformer, which comprises a transformer body 1, an upper connecting piece 2, a lower connecting piece 3 and a fuse tube 4, as shown in figure 1.
The mutual inductor comprises a mutual inductor body 1, an upper connecting piece 2, a lower connecting piece 3 and a lower connecting piece 2, wherein the mutual inductor body 1 is arranged along a Z axis, the left end of the upper connecting piece 2 is connected to the top end of the mutual inductor body 1, the right end of the upper connecting piece 2 extends along the X axis direction and can elastically swing along the Z axis direction, the left end of the lower connecting piece 3 is connected to the bottom end of the mutual inductor body 1, and the right end of the lower connecting piece 3 is opposite to the right end of the upper connecting piece 2; the top end of the fuse tube 4 is clamped on the upper connecting piece 2, and the bottom end of the fuse tube 4 is clamped on the lower connecting piece 3.
Fuse tube 4 sets up in mutual-inductor body 1's outside through last connecting piece 2 and lower connecting piece 3, need not the outage and can realize dismantling and install fuse tube 4, it can follow Z axle elasticity swing to go up connecting piece 2, fuse tube 4 can at first cooperate with last connecting piece 2, and make the direction motion of connecting piece 2 to keeping away from lower connecting piece 3, later make fuse tube 4 connect in lower connecting piece 3 again, lower connecting piece 3 provides the supporting role to fuse tube 4, when dismantling the operation, thereby can make fuse tube 4 break away from lower connecting piece 3 to the direction motion of keeping away from lower connecting piece 3 earlier, later break away from connecting piece 2 again, the voltage transformer easy to assemble of this kind of structure and dismantle fuse tube 4.
Further, an elastic member 5 is provided between the upper link 2 and the lower link 3, and the elastic member 5 applies a tensile force to the upper link 2 to move toward the lower link 3. The elastic piece 5 enables the upper connecting piece 2 to move towards the lower connecting piece 3, and then applies acting force close to the lower connecting piece 3 to the fuse tube 4, so that the fuse tube 4 is prevented from being easily separated from the upper connecting piece 2, and the stability of the fuse tube 4 mounted on the mutual inductor body 1 is improved.
In the present embodiment, the elastic member 5 is a compression spring. Optionally, the surface of the compression spring is coated with an insulating varnish to improve the insulation of the elastic member 5.
With reference to fig. 1 and 2, the upper connecting element 2 comprises an elastic limb 21 and an upper circlip 22. The elastic limb 21 has elasticity, and one end of the elastic limb 21 is connected with the mutual inductor body 1, and the other end can elastically swing along the Z axis and is connected with the upper clamp spring 22. Go up jump ring 22 and can swing along the Z axle synchronization through the elastic action of elasticity limb 21, during installation fuse-tube 4, can at first can be with the top joint of fuse-tube 4 in last jump ring 22, drive elasticity limb 21 afterwards along the direction motion of keeping away from lower connecting piece 3 to conveniently arrange fuse-tube 4 in between upper connecting piece 2 and lower connecting piece 3.
As shown in fig. 3, the upper clamp spring 22 has a side wall 221 and a cassette base 222, the side wall 221 is disposed at a circumferential edge of the cassette base 222, an opening is formed at an end of the upper clamp spring 22 away from the cassette base 222, and an inner diameter of the side wall 221 is gradually reduced from the opening toward the cassette base 222. The top end of the fuse tube 4 can enter the sidewall 221 from the opening and finally can be connected to the socket bottom 222 and electrically connected. The side wall 221 extends from the opening to the cartridge base 222 and tapers to facilitate gripping of the fuse tube 4.
The fuse tube 4 is also electrically connected to the side wall 221.
With continued reference to fig. 3, the sidewall 221 is formed by a plurality of sidewall monomers, and two adjacent sidewall monomers are connected to each other at an end close to the holder base 222 and at an end far from the holder base 222 at a predetermined distance. Because a plurality of side wall monomers are keeping away from the one end interval of cassette base 222 to make lateral wall 221 can strut to bigger scope, guide fuse tube 4 easily simultaneously, and the one end interconnect that the side wall monomer is close to cassette base 222 can not influence last jump ring 22 and press from both sides tight fuse tube 4.
In the present embodiment, as shown in fig. 4, the inner wall of each sidewall monomer is provided with a lip 221A extending in the circumferential direction. The arrangement of the convex lip portion 221A can increase the friction force between the side wall monomer and the fuse tube 4, and the stable effect of the upper clamp spring 22 in clamping the fuse tube 4 is improved.
The single protruding lip 221A of each side wall is arranged on the same annular surface, the annular surface is parallel to the base 222, and the top end of the fuse tube 4 is provided with an annular groove matched with the protruding lip 221A. When fuse tube 4 cooperates with last jump ring 22 with arbitrary angle, can both with lip 221A joint to can not influence fuse tube 4 when going up jump ring 22 joint fuse tube 4 and rotate around self axis, fuse tube 4 is rotatory all with lip 221A joint cooperation to arbitrary angle.
As shown in fig. 3, one end of the side wall single body, which is far away from the holder base 222, is connected with a guide portion 223, and an included angle between the guide portion 223 and the central axis of the upper snap spring 22 is greater than an included angle between the side wall single body and the central axis of the upper snap spring 22. When the top end of the fuse tube 4 abuts against the guide portion 223, the guide portion 223 can guide the transfer of the fuse tube 4 into the upper snap spring 22.
It should be noted that the central axis of the upper clamp spring 22 vertically passes through the geometric center of the clamp base 222.
As shown in fig. 5, the lower connection member 3 includes a connection limb 31 and a lower clamp spring 32, one end of the connection limb 31 is connected to the transformer body 1, and the other end of the connection limb 31 can be connected to the lower clamp spring 32, and the elastic coefficient of the connection limb 31 is smaller than the elastic coefficient of the elastic limb 21, and the structure of the lower clamp spring 32 is the same as that of the upper clamp spring 22, which is not described herein again. The connecting limb 31 has certain elasticity, the fuse tube 4 is convenient to detach, the elastic coefficient of the connecting limb 31 is smaller than that of the elastic limb 21, and when the fuse tube 4 is installed, the connecting limb 31 is not easy to deform so as to support the fuse tube 4.
As shown in fig. 1, the outer wall of the fuse tube 4 is provided with a hook 40. In one use scenario, the operator can transfer the fuse tube 4 between the upper and lower attachment members 2, 3 using a long rod attachment clevis 40 with a hook or clamp.
The assembly principle of the voltage transformer is as follows: when installation fuse-link 4, with fuse-link 4 butt upper junction spare 2 messenger elasticity limb 21 warp, fuse-link 4 slides in lateral wall 221 and cooperates with lateral wall 221 joint through the guide part 223 of upper junction spare 2, and elasticity limb 21 recovers afterwards, makes things convenient for fuse-link 4 to align lower connecting piece 3 to further the joint is in lower connecting piece 3. When the fuse tube 4 is disassembled, the fuse tube 4 is jacked up the upper connecting piece 2, the elastic limbs 21 are deformed, and after the fuse tube 4 is separated from the lower connecting piece 3, the fuse tube 4 is pulled downwards, so that the fuse tube 4 is separated from the upper connecting piece 2.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (7)

1. A voltage transformer, comprising:
the mutual inductor comprises a mutual inductor body (1), wherein the mutual inductor body (1) is arranged along a Z axis;
the first end of the upper connecting piece (2) is connected to the top end of the mutual inductor body (1), and the second end of the upper connecting piece (2) extends along the X-axis direction and can elastically swing along the Z-axis direction;
the first end of the lower connecting piece (3) is connected to the bottom end of the mutual inductor body (1), the second end of the lower connecting piece (3) is opposite to the second end of the upper connecting piece (2), an elastic piece (5) is arranged between the upper connecting piece (2) and the lower connecting piece (3), and the elastic piece (5) applies pulling force to the upper connecting piece (2) to move towards the lower connecting piece (3);
the top end of the fuse tube (4) is clamped with the upper connecting piece (2), and the bottom end of the fuse tube (4) is clamped with the lower connecting piece (3);
the upper connecting piece (2) comprises an elastic limb (21) and an upper clamp spring (22), the elastic limb (21) has elasticity, one end of the elastic limb (21) is connected with the mutual inductor body (1), and the other end of the elastic limb (21) can elastically swing along a Z axis and is connected with the upper clamp spring (22);
lower connecting piece (3) are including connecting limb (31) and lower jump ring (32), the one end of connecting limb (31) is connected the lower extreme of mutual-inductor body (1), the other end can be connected jump ring (32) down, just connecting limb (31) elastic coefficient is less than the elastic coefficient of elastic limb (21).
2. The voltage transformer according to claim 1, characterized in that the upper clamp spring (22) has a side wall (221) and a socket bottom (222), the upper clamp spring (22) forms an opening at an end away from the socket bottom (222), and an inner diameter of the side wall (221) is gradually reduced from the opening to the socket bottom (222).
3. The voltage transformer according to claim 2, characterized in that the side wall (221) is composed of a plurality of side wall units, and two adjacent side wall units are connected with each other at an end close to the holder base (222) and at an end far from the holder base (222) at a predetermined distance.
4. The voltage transformer according to claim 3, characterized in that the inner wall of each of said single side wall bodies is provided with a circumferentially extending lip (221A).
5. The voltage transformer according to claim 4, characterized in that the protruding lip (221A) of each single sidewall is arranged on the same annular surface, the annular surface is parallel to the surface of the base (222), and the top end of the fuse tube (4) is provided with an annular groove adapted to the protruding lip (221A).
6. The voltage transformer according to claim 3, characterized in that one end of the side wall single body, which is far away from the clamp seat bottom (222), is connected with a guide part (223), and an included angle between the guide part (223) and a central axis of the upper clamp spring (22) is larger than an included angle between the side wall single body and the central axis of the upper clamp spring (22).
7. The voltage transformer according to claim 1, characterized in that the outer wall of the fuse tube (4) is provided with a hook (40).
CN202010529133.3A 2020-06-11 2020-06-11 Voltage transformer Active CN111696775B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010529133.3A CN111696775B (en) 2020-06-11 2020-06-11 Voltage transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010529133.3A CN111696775B (en) 2020-06-11 2020-06-11 Voltage transformer

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CN111696775A CN111696775A (en) 2020-09-22
CN111696775B true CN111696775B (en) 2021-10-26

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Publication number Priority date Publication date Assignee Title
US4320432A (en) * 1979-12-03 1982-03-16 San Angelo Electric Service Company High voltage transformer bushing fuse and arrester arrangement
CN202488012U (en) * 2012-03-09 2012-10-10 宁波天安(集团)股份有限公司 Combined transformer for photovoltaic power generation
CN203134740U (en) * 2013-03-13 2013-08-14 康联精密机电(深圳)有限公司 Fuse connector
CN203300587U (en) * 2013-06-27 2013-11-20 国家电网公司 High voltage protective tube of voltage transformer
CN204088246U (en) * 2014-06-20 2015-01-07 Abb技术有限公司 Fuse supporting component on high voltage switchgear and high voltage switchgear
CN104616874A (en) * 2015-02-14 2015-05-13 云南电网有限责任公司带电作业分公司 Voltage transformer protection device
CN204885950U (en) * 2015-08-21 2015-12-16 国网河北肃宁县供电公司 Voltage transformer change of fuse device
CN205264663U (en) * 2015-12-31 2016-05-25 天津威图电气设备有限公司 Fixed electrically conductive shell fragment of insurance
CN205488927U (en) * 2016-02-24 2016-08-17 康联精密机电(深圳)有限公司 Multi -functional adapter of solar energy fuse
CN208401513U (en) * 2018-07-10 2019-01-18 陕西和硕电气有限公司 A kind of high-voltage fuse, arrester integration apparatus
CN209822586U (en) * 2019-07-02 2019-12-20 厦门顾德益电器有限公司 Improved 24kV fuse cylinder
CN210467748U (en) * 2019-11-20 2020-05-05 高春胜 Operation maintenance equipment for transformer substation

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