CN110931231A - Lightning protection dry-type transformer - Google Patents

Lightning protection dry-type transformer Download PDF

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Publication number
CN110931231A
CN110931231A CN201911248236.6A CN201911248236A CN110931231A CN 110931231 A CN110931231 A CN 110931231A CN 201911248236 A CN201911248236 A CN 201911248236A CN 110931231 A CN110931231 A CN 110931231A
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CN
China
Prior art keywords
lightning
lightning protection
protection dry
lightning arrester
arrester
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.)
Granted
Application number
CN201911248236.6A
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Chinese (zh)
Other versions
CN110931231B (en
Inventor
孙业荣
陈飞
朱培珍
王言德
黄晓龙
齐云龙
周欣林
勇钰莹
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.)
Intelligent Electric Co Ltd Of Shandong Electrician Electric Group
Original Assignee
Intelligent Electric Co Ltd Of Shandong Electrician Electric Group
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.)
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Publication date
Application filed by Intelligent Electric Co Ltd Of Shandong Electrician Electric Group filed Critical Intelligent Electric Co Ltd Of Shandong Electrician Electric Group
Priority to CN201911248236.6A priority Critical patent/CN110931231B/en
Publication of CN110931231A publication Critical patent/CN110931231A/en
Application granted granted Critical
Publication of CN110931231B publication Critical patent/CN110931231B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/40Structural association with built-in electric component, e.g. fuse
    • H01F27/402Association of measuring or protective means

Abstract

The invention provides a lightning protection dry-type transformer, and relates to the technical field of transformers. The lightning protection dry-type transformer comprises a body and at least one lightning arrester arranged on the body, wherein one end of each lightning arrester is connected with a high-voltage input current lead of one phase of the body and the winding head end of a winding, and the other end of each lightning arrester is grounded. In the lightning protection dry-type transformer, the lightning arrester has less wiring, so the wiring is simple; in addition, the lightning protection dry-type transformer can be directly arranged in a power distribution room without a shell, so that the cost can be saved.

Description

Lightning protection dry-type transformer
Technical Field
The invention relates to the technical field of transformers, in particular to a lightning protection dry type transformer.
Background
Dry-type transformers are generally used in power distribution rooms in residential areas, office buildings, shopping malls, airports, etc., and are equipped with a special housing, and generally, the transformer is easily damaged or burned by being subjected to overcurrent and overvoltage, only by grounding the transformer to conduct the current to the ground, without a separate lightning protection measure.
To the above problem, the prior art provides a lightning protection scheme for placing a lightning rod at the top of the housing or installing the lightning rod on the body of the transformer. However, since the lightning rod is higher, the lightning protection scheme of placing the lightning rod on the top of the shell has a higher requirement on the height of the power distribution room, and the lightning protection scheme of additionally installing the lightning rod on the body has a higher requirement on the height of the shell, so that the cost is undoubtedly increased no matter the height of the power distribution room is increased or the height of the shell is increased.
The prior art also provides a lightning protection scheme for placing the lightning arrester on the top of the shell, and although the lightning protection scheme has no special requirements on the height of a power distribution room and the height of the shell, the dry-type transformer adopting the lightning protection scheme in the prior art has the problem of complex wiring of the lightning arrester.
Disclosure of Invention
The invention aims to provide a lightning protection dry type transformer to solve the technical problem that the lightning arrester of the dry type transformer in the prior art is complicated in wiring.
The invention provides a lightning protection dry type transformer which comprises a body and at least one lightning arrester arranged on the body, wherein one end of each lightning arrester is connected with a high-voltage input current lead of one phase of the body and the winding head end of a winding, and the other end of each lightning arrester is grounded.
Furthermore, the lightning protection dry-type transformer is a three-phase transformer, the number of the lightning arresters is three, the three-phase high-voltage input current leads of the body are respectively connected with the three lightning arresters in a one-to-one correspondence manner, and the head ends of the three-phase windings of the body are also respectively connected with the three lightning arresters in a one-to-one correspondence manner.
Further, the surge arrester has an insulating portion capable of supporting the high-voltage input current lead.
Further, the body is provided with a clamping piece, the lightning arrester is connected with the clamping piece, and the lightning arrester is grounded through the clamping piece.
Further, the lightning protection dry-type transformer further comprises a bracket, the bracket is arranged on the clamping piece, and the lightning arrester is arranged on the bracket.
Furthermore, the lightning protection dry-type transformer is a three-phase transformer, and three-phase windings of the body are distributed along a first horizontal direction;
the bracket comprises a first plate and a second plate, the length direction of the first plate and the length direction of the second plate both extend along a first horizontal direction, the second plate is vertically and fixedly connected to the top end of the first plate, the width direction of the second plate extends along a second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction;
the second plate is fixedly connected with the clamping piece.
Furthermore, two ends of the lightning arrester are distributed along a second horizontal direction, and one end, far away from the clamping piece, of the lightning arrester is connected with the high-voltage input current lead and the head end of the winding.
Further, the arrester is a zinc oxide arrester.
Furthermore, a winding head end lead is connected to the winding head end, and the lightning arrester is connected with the winding head end lead.
Further, the lightning protection dry-type transformer also comprises a shell, and the body and the lightning arrester are both arranged in the shell.
The lightning protection dry-type transformer provided by the invention can produce the following beneficial effects:
the lightning protection dry-type transformer comprises a body and at least one lightning arrester, wherein the lightning arrester is directly arranged on the body, one end of the lightning arrester is connected with a high-voltage input current lead of one phase of the body and the winding head end of a winding, the other end of the lightning arrester is grounded, and the lightning arrester is few in wiring, so that the wiring is simple.
In addition, the lightning arrester of the lightning protection dry type transformer is directly arranged on the body, so that the lightning protection dry type transformer can be directly arranged in a power distribution room without arranging a shell, and the cost can be saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a lightning protection dry type transformer according to an embodiment of the present invention;
fig. 2 is a second schematic diagram of a lightning protection dry type transformer according to an embodiment of the invention.
Icon:
100-a lightning arrester; 110-an insulating part;
200-a scaffold;
300-high voltage input current lead;
400-a clamp;
500-winding; 510-winding head end; 520-winding head end lead;
600-iron core.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "inside", "outside", "horizontal", "vertical", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or vertical, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Fig. 1 is a schematic diagram of a lightning protection dry type transformer provided in this embodiment, and fig. 2 is a schematic diagram of a lightning protection dry type transformer provided in this embodiment.
The present embodiment provides a lightning protection dry type transformer, as shown in fig. 1 and 2, the lightning protection dry type transformer is a three-phase transformer, the lightning protection dry type transformer includes a body and three lightning arresters 100 arranged in the body, one end of each lightning arrester 100 is connected to a high-voltage input current lead 300 of one phase of the body and a winding head end 510 of a winding 500, and the other end is grounded.
In the lightning protection dry-type transformer provided by this embodiment, the lightning arrester 100 is equivalent to an insulator under a rated voltage, the high-voltage input current lead 300 is connected with the winding head end 510, and the lightning protection dry-type transformer operates normally; when a lightning strike or an overvoltage occurs, the arrester 100 acts as a conductor to conduct current to the ground, thereby effectively protecting equipment.
It should be noted that in other embodiments of the present application, the lightning protection dry type transformer is not limited to a three-phase transformer, for example: the lightning protection dry-type transformer is a one-way transformer.
It should be further noted that, in other embodiments of the present application, when the lightning protection dry-type transformer is a three-phase transformer, the number of the lightning arresters 100 is not limited to three, for example: the number of the arresters 100 is two, two high-voltage input current lead wires 300 of three phases of the three-phase transformer are respectively connected to the two arresters 100 in a one-to-one correspondence, and the winding head ends (510) of the two phases are also respectively connected to the two arresters 100 in a one-to-one correspondence.
In the lightning protection dry-type transformer provided by this embodiment, the lightning arrester 100 is directly disposed on the body, and one end of the lightning arrester is connected to the high-voltage input current lead 300 of one phase of the body and the winding head end 510 of the winding 500, and the other end is grounded, so that the lightning arrester 100 has fewer wires, and thus the wires are simple.
In addition, in the lightning protection dry-type transformer provided by this embodiment, the lightning arrester 100 is directly disposed on the body, so that the lightning protection dry-type transformer may not be disposed on the housing, but may be directly disposed in the power distribution room, thereby saving the cost.
In this embodiment, the lightning protection dry-type transformer may also include a housing, and the body and the lightning arrester 100 are both disposed in the housing. The housing protects the body and the arrester 100. Compared with the lightning protection scheme of placing the lightning arrester on the top of the shell in the prior art, the lightning protection dry-type transformer provided by the embodiment has the advantages that the lightning arrester 100 is located in the shell, the shell does not need to be modified so that the lightning arrester 100 can be installed, and in this respect, the lightning protection dry-type transformer provided by the embodiment can also save cost.
In addition, the lightning arrester 100 is located in the housing, so that the occupation of the space in the power distribution room and outside the housing is reduced, and the utilization rate of the space in the lightning protection dry type transformer housing is improved.
In the present embodiment, as shown in fig. 1, the surge arrester 100 has an insulating portion 110, and the insulating portion 110 can support a high-voltage input current lead 300. The high voltage side of a conventional dry-type transformer is generally provided with a post insulator, and the post insulator plays a role of insulation support. In the lightning protection dry-type transformer provided in this embodiment, the insulating portion 110 of the lightning arrester 100 can serve as an insulating support, and thus can replace a post insulator. That is, in the lightning protection dry-type transformer provided in this embodiment, the lightning arrester 100 can suppress various overvoltage to protect the lightning protection dry-type transformer body, and can also provide an insulating support for the high-voltage input current lead 300 to reduce the number of post insulators. In addition, in this arrangement, the lightning arrester 100 can use the fixing device of the post insulator without adding an additional fixing device, so that the overall cost is hardly affected, and the lightning arrester has a very high application value.
In this embodiment, as shown in fig. 1 and 2, the body is provided with a clip 400, the lightning arrester 100 is connected to the clip 400, and the lightning arrester 100 is grounded through the clip 400. In addition, the clip 400 is also used to clamp the silicon steel sheet of the iron core 600.
It should be noted that in other embodiments of the present application, the lightning arrester 100 may not be grounded through the clip 400, for example: the body is provided with the earth connection, and arrester 100 is connected with the earth connection, and arrester 100 passes through the earth connection ground connection.
In this embodiment, as shown in fig. 1 and fig. 2, the lightning protection dry-type transformer further includes a bracket 200, the bracket 200 is disposed on the clip 400, and the lightning arrester 100 is disposed on the bracket 200.
Specifically, in the present embodiment, as shown in fig. 1 and 2, the windings 500 of the three phases of the body are arranged in the first horizontal direction; the bracket 200 includes a first plate and a second plate, the length direction of the first plate and the length direction of the second plate both extend along a first horizontal direction, the second plate is vertically and fixedly connected to the top end of the first plate, the width direction of the second plate extends along a second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction; the second plate is fixedly connected to the clip 400. With such an arrangement, one bracket 200 can be simultaneously fixedly provided with a plurality of arresters 100, and the structure is simple, and the number of components is small, so that the assembly process can be simplified.
It should be noted that the present embodiment provides only one arrangement of the bracket 200, and in other embodiments of the present application, the bracket 200 is not limited to this arrangement, for example: the number of the brackets 200 may be three, and the three brackets 200 are respectively used for fixedly arranging three lightning arresters 100; another example is: the first plate and the second plate may not be perpendicularly connected or the like as long as the arrester 100 can be fixedly disposed, and the present application does not specifically limit the number thereof, the positional relationship of the first plate and the second plate, or the like.
Specifically, in the present embodiment, as shown in fig. 2, two ends of the lightning arrester 100 are distributed along the second horizontal direction, and one end of the lightning arrester 100 away from the clip 400 is connected to the high-voltage input current lead 300 and the winding head end 510. So configured, the lightning arrester 100 is used to connect the high-voltage input current lead 300 and the end of the winding head end 510 proximate to each other, so that it is convenient to connect the high-voltage input current lead 300 and the winding head end 510 of each phase to the lightning arrester 100 correspondingly.
In an embodiment, the arrester 100 may be a zinc oxide arrester. The zinc oxide lightning arrester has the capability of absorbing various lightning impulse voltages, power frequency transient overvoltage and operation overvoltage.
The zinc oxide lightning arrester mainly comprises a zinc oxide piezoresistor. Each voltage dependent resistor has a certain switching voltage or voltage dependent voltage, and when the voltage is in a normal working voltage (namely the voltage is less than the voltage dependent voltage), the voltage dependent resistor is in a high-resistance state and is equivalent to an insulator; under the action of impulse voltage, namely when the voltage is greater than the voltage-sensitive voltage, the resistance value of the voltage-sensitive resistor is very small, and the voltage-sensitive resistor is equivalent to a short circuit state; and when the voltage higher than the voltage-sensitive voltage is removed, the voltage-sensitive resistor can recover the high-resistance state. Therefore, when the body of the lightning protection dry type transformer is provided with the zinc oxide lightning arrester and is struck by lightning, the high voltage of the lightning wave breaks down the piezoresistor, and the lightning current flows into the ground through the piezoresistor, so that the safety of the winding 500 and the like in the body can be protected.
In addition, in other embodiments of the present application, the lightning arrester 100 may be other lightning arresters besides the zinc oxide lightning arrester, as long as it can protect the body from being damaged by overvoltage, and the present application does not limit the type of the lightning arrester 100.
In this embodiment, the winding head end 510 is connected to a winding head end lead 520, and the arrester 100 is connected to the winding head end lead 520.
In this embodiment, the lightning protection dry type transformer may be an epoxy dry type transformer. The epoxy resin dry type transformer takes epoxy resin as an insulating material, high and low voltage windings are wound by adopting a copper strip or a copper foil, and the epoxy resin is poured and cured in vacuum to form a high-strength glass fiber reinforced plastic body structure. The epoxy resin dry-type transformer has the characteristics of good electrical property, strong lightning impulse resistance, strong short circuit resistance, small volume, light weight and the like.
In this embodiment, epoxy dry-type transformer is provided with arrester 100, so insulating structure can effectively avoid suffering overvoltage such as operation or lightning impulse and the permanent damage that can't self-heal to extension insulating structure's life reduces the condition that insulating structure broke down.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The lightning protection dry type transformer is characterized by comprising a body and at least one lightning arrester (100) arranged on the body, wherein one end of each lightning arrester (100) is connected with a high-voltage input current lead (300) of one phase of the body and a winding head end (510) of a winding (500), and the other end of each lightning arrester is grounded.
2. The lightning protection dry-type transformer of claim 1, wherein the lightning protection dry-type transformer is a three-phase transformer, the number of the lightning arresters (100) is three, the high-voltage input current leads (300) of the three phases of the body are respectively connected with the three lightning arresters (100) in a one-to-one correspondence, and the winding head ends (510) of the three phases of the body are also respectively connected with the three lightning arresters (100) in a one-to-one correspondence.
3. Lightning protection dry transformer according to claim 1 or 2, wherein the lightning arrester (100) has an insulation (110), the insulation (110) being able to support the high voltage input current lead (300).
4. The lightning protection dry transformer according to claim 1, characterized in that the body is provided with a clip (400), the lightning arrester (100) being connected with the clip (400), the lightning arrester (100) being grounded through the clip (400).
5. The lightning protection dry transformer according to claim 4, further comprising a bracket (200), the bracket (200) being disposed to the clip (400), the lightning arrester (100) being disposed to the bracket (200).
6. The lightning protection dry transformer according to claim 5, wherein the lightning protection dry transformer is a three-phase transformer, the windings (500) of the three phases of the body being arranged in a first horizontal direction;
the bracket (200) comprises a first plate and a second plate, the length direction of the first plate and the length direction of the second plate both extend along a first horizontal direction, the second plate is vertically and fixedly connected to the top end of the first plate, the width direction of the second plate extends along a second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction;
the second plate is fixedly connected with the clamping piece (400).
7. The lightning protection dry transformer according to claim 6, wherein the two ends of the lightning arrester (100) are distributed along a second horizontal direction and the end of the lightning arrester (100) remote from the clip (400) connects the high voltage input current lead (300) and the winding head end (510).
8. Lightning protection dry transformer according to claim 1 or 2, wherein the lightning arrester (100) is a zinc oxide lightning arrester.
9. Lightning protection dry transformer according to claim 1 or 2, wherein a winding head lead (520) is connected to the winding head (510), the lightning arrester (100) being connected to the winding head lead (520).
10. The lightning protection dry transformer according to claim 1 or 2, further comprising an enclosure, the body and the lightning arrester (100) being disposed within the enclosure.
CN201911248236.6A 2019-12-06 2019-12-06 Lightning protection dry-type transformer Active CN110931231B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911248236.6A CN110931231B (en) 2019-12-06 2019-12-06 Lightning protection dry-type transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911248236.6A CN110931231B (en) 2019-12-06 2019-12-06 Lightning protection dry-type transformer

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CN110931231A true CN110931231A (en) 2020-03-27
CN110931231B CN110931231B (en) 2021-05-04

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201444578U (en) * 2009-05-19 2010-04-28 徐殿成 Lightning-protection device for transformer
CN201570359U (en) * 2009-08-28 2010-09-01 马琳 Dry-type lightning proof transformer
CN103022917A (en) * 2012-11-30 2013-04-03 河南省电力公司驻马店供电公司 Uninterruptible assembled/disassembled mobile distribution transformer
CN203760885U (en) * 2014-04-10 2014-08-06 国家电网公司 Pole-mounted distribution transformation system
CN204130318U (en) * 2014-09-11 2015-01-28 佛山佛锐电气有限公司 A kind of lightning protection dry-type transformer
CN105023668A (en) * 2015-06-29 2015-11-04 蔡桂钧 Zinc oxide arrester for power plant
CN205645498U (en) * 2016-05-05 2016-10-12 国网天津市电力公司 Transformer high voltage arrester installing support
CN106208723A (en) * 2016-08-24 2016-12-07 合肥智博电气有限公司 Voltage-stabilizing energy-saving device
CN108461255A (en) * 2018-01-24 2018-08-28 江苏瑞恩电气股份有限公司 A kind of dry-type transformer with lightning protection function

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201444578U (en) * 2009-05-19 2010-04-28 徐殿成 Lightning-protection device for transformer
CN201570359U (en) * 2009-08-28 2010-09-01 马琳 Dry-type lightning proof transformer
CN103022917A (en) * 2012-11-30 2013-04-03 河南省电力公司驻马店供电公司 Uninterruptible assembled/disassembled mobile distribution transformer
CN203760885U (en) * 2014-04-10 2014-08-06 国家电网公司 Pole-mounted distribution transformation system
CN204130318U (en) * 2014-09-11 2015-01-28 佛山佛锐电气有限公司 A kind of lightning protection dry-type transformer
CN105023668A (en) * 2015-06-29 2015-11-04 蔡桂钧 Zinc oxide arrester for power plant
CN205645498U (en) * 2016-05-05 2016-10-12 国网天津市电力公司 Transformer high voltage arrester installing support
CN106208723A (en) * 2016-08-24 2016-12-07 合肥智博电气有限公司 Voltage-stabilizing energy-saving device
CN108461255A (en) * 2018-01-24 2018-08-28 江苏瑞恩电气股份有限公司 A kind of dry-type transformer with lightning protection function

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