WO2015035717A1 - 一种防爆炸起火油纸电容式变压器套管 - Google Patents

一种防爆炸起火油纸电容式变压器套管 Download PDF

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Publication number
WO2015035717A1
WO2015035717A1 PCT/CN2013/088914 CN2013088914W WO2015035717A1 WO 2015035717 A1 WO2015035717 A1 WO 2015035717A1 CN 2013088914 W CN2013088914 W CN 2013088914W WO 2015035717 A1 WO2015035717 A1 WO 2015035717A1
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Prior art keywords
flange
insulation
casing pipe
cylinder
oil
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PCT/CN2013/088914
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English (en)
French (fr)
Inventor
虞育号
汪新泉
冯彬
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江苏智达高压电气有限公司
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Publication of WO2015035717A1 publication Critical patent/WO2015035717A1/zh

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00Insulators or insulating bodies characterised by their form
    • H01B17/26Lead-in insulators; Lead-through insulators
    • H01B17/28Capacitor type
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/02Casings
    • H01F27/04Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00Insulators or insulating bodies characterised by their form
    • H01B17/34Insulators containing liquid, e.g. oil

Definitions

  • the present invention relates to a transformer bushing, and more particularly to an anti-explosive ignition oil-paper-capacitor transformer bushing.
  • the main cause of the initial failure of the water in the casing is the sudden failure, which is extremely harmful.
  • the main reason is that in the unsealed condition (the cause of the damage to the seal may be due to a defect in the structural design or the operator's misoperation during installation of the casing), and the inside of the casing is infiltrated with moisture.
  • Breakdown discharge inside the casing causes a large amount of decomposition of the insulating oil to generate gas, which causes the internal pressure of the casing to be too large, resulting in an explosion accident.
  • the object of the present invention is to provide an anti-explosive ignition oil-paper capacitive transformer bushing, which has high reliability, can ensure safe operation and is easy to implement.
  • an explosion-proof ignition paper capacitor transformer bushing including a terminal block, a metal expander, an upper insulation, a mounting flange, a flange cylinder, a lower insulation, a base,
  • the conductive rod and the capacitor core are characterized in that: the lower insulation is a FRP cylinder, the mounting flange is fixed with the flange cylinder, the flange cylinder and the lower insulation are integrally cast; the base is glued on the lower insulation;
  • the main insulated capacitor core is fixed and sealed by a strong spring in the upper insulation, the flange cylinder, the lower insulation and the base; the top of the upper insulation is placed inside the casing
  • the metal expander that always maintains a slight positive pressure.
  • the high-strength FRP cylinder for the lower insulation replaces the porcelain sleeve, the flange and the flange cylinder are welded, the flange cylinder and the lower insulation casting are integrated, the base is glued on the lower insulation, and the capacitor core is fixed and sealed through the base.
  • the whole casing oil is integrated into one, and the seal is ensured to prevent the porcelain parts from leaking or bursting due to excessive pressure, which is harmful to equipment and personal safety.
  • the metal expander adopts a double corrugated structure.
  • the metal expander includes a lower flange, an upper flange, a radial corrugation and an axial corrugation.
  • One end of the radial corrugation is connected to the upper flange, and the other end is connected to the upper end of the axial corrugation; Connect to the lower flange to the lower end of the corrugation.
  • the metal expander is provided with a circular step in the downward insulating direction.
  • the annular step is 20mm higher than the flat surface of the expander.
  • An oil sampling device directly connected to the oil sampling needle is provided on the mounting flange.
  • a double corrugated metal expander is used in the sleeve head to replace the traditional oil pillow, and the metal expander is used as an oil storage component of the sleeve for the thermal expansion and contraction of the insulating oil in the sleeve, so that the inside of the sleeve is always kept micro.
  • the head metal expander acts first, which can effectively avoid the explosion of the casing;
  • the casing metal expander is provided with a ring step to the casing body, except When the annular step is connected with the main body of the casing, the entire casing is still in a sealed state, and the annular step is about 20 mm higher than the bottom plane, and the casing can be safely operated in a short time after the expansion of the expander.
  • FIG. 1 is a schematic structural view of a casing of an explosion-proof ignition paper transformer of the present invention
  • FIG. 2 is a partially enlarged schematic view of a portion A of FIG. 1
  • FIG. 3 is another schematic structural view of a metal expander of the present invention
  • Partially enlarged schematic view of Part B in 1 Partially enlarged schematic view of Part B in 1 .
  • the bushing comprises a terminal 1, a metal expander 2, an upper insulation 3, a mounting flange 4, a flange cylinder 5, a lower insulation 6, a base 7 , the conductive rod 12 and the capacitor core 8, the capacitor core 8 as the main insulation, the sleeve is integrally sealed by the strong spring 9 and the inter-part seal.
  • the insulation under the casing 6 is replaced by a high-strength FRP insulation cylinder, the mounting flange 4 and the flange cylinder 5 are welded, the porcelain sleeve flange cylinder 5 and the lower insulation 6 are integrally cast, and the base 7 is glued to the lower insulation 6, the capacitor
  • the core 8 is fixed and sealed by the base 7; the sleeve head is provided with a double corrugated metal expander 2 instead of the conventional oil pillow, so that the inside of the product is always kept slightly positive pressure; see Fig.
  • the metal expander adopts double corrugated structure, metal
  • the expander 2 includes a lower flange 23, an upper flange 24, a radial corrugation 21 and an axial corrugation 22, one end of the radial corrugation is connected to the upper flange, and the other end is connected to the upper end of the axial corrugation; the lower end of the axial corrugation Connected to the lower flange.
  • the metal expander is provided with a circular step 10 to the sleeve body, and the annular step is about 20 mm higher than the bottom plane.
  • Fig. 3 is a schematic view showing another structure of the metal expander of the present invention, in which the spring fixing structure is replaced with a structure fixed by bolts through a flange.
  • the casing mounting flange 4 has an oil taking device 11 which can be directly connected to the oil sampling needle tube, as shown in Fig. 4.
  • the metal expander is used as an oil storage component of the casing for the thermal expansion and contraction of the insulating oil in the casing, so that the inside of the casing is always kept at a slight positive pressure; when the pressure inside the casing rises due to a fault, the head The metal expander operates first, which can effectively avoid the occurrence of casing explosion accidents; the casing metal expander is provided with a circular step to the casing body, and the entire casing is still sealed except that the ring step is connected with the casing body. After the expander is operated, the casing can be safely operated in a short time.

Abstract

本发明公开了一种防爆炸起火油纸电容式变压器套管,该套管包括接线端子、金属膨胀器、上绝缘、安装法兰、法兰圆筒、下绝缘、底座导电杆和电容芯子,下绝缘为玻璃钢筒,安装法兰与法兰圆筒固定在一起,法兰圆筒和下绝缘浇注为一体;底座胶装在下绝缘上;作为主绝缘的电容芯子通过强力弹簧固定和密封在上绝缘、法兰圆筒、下绝缘和底座内;使套管内部始终保持微正压的金属膨胀器设置在上绝缘的顶部。当套管内部因故障出现压力升高时,头部金属膨胀器先动作,可有效避免套管爆炸事故的发生;安装法兰上还有取油样装置,微正压状态下可以直接同取油针管相连,无需放气,非常方便。

Description

一种防爆炸起火油纸电容式变压器套管 技术领域 本发明涉及一种变压器套管, 具体涉及一种防爆炸起火油纸电容式变压器 套管。
背景技术 变压器套管运行条件极为苛刻, 运行时受到电压、 电流、 拉力、 震动、 风 力、 大气污秽等多方面的综合影响, 一旦产生故障, 极易导致事故扩大, 损失 严重。 因此, 套管也是各主机配件中最为关注的配件。 变压器套管发生爆炸, 可能会造成重大经济损失和威胁人员生命安全, 其 发生的主要原因有:
1、 套管内部进水仍是的初期故障发生的主要原因, 多为突发性故障, 危害 性极大。 主要原因是非密封状况下 (破坏密封的原因可能为结构设计存在缺陷 或套管安装时安装人员的误操作导致) , 套管内部渗入水份。
2、 套管内部击穿放电, 导致绝缘油大量分解产生气体, 造成套管内部压力 过大, 从而发生爆炸事故。
发明内容 为了克服现有的油纸电容式变压器套管的缺点, 本发明的目的是提供一种 防爆炸起火油纸电容式变压器套管, 该套管可靠性高、 能保证运行安全、 容易 实现。 本发明的目的是通过以下技术方案来实现的: 一种防爆炸起火油纸电容式变压器套管, 包括接线端子、 金属膨胀器、 上 绝缘、 安装法兰、 法兰圆筒、 下绝缘、 底座、 导电杆和电容芯子, 其特征在于: 所述下绝缘为玻璃钢筒, 安装法兰与法兰圆筒固定在一起, 法兰圆筒和下绝缘 浇注为一体; 底座胶装在下绝缘上; 作为主绝缘的电容芯子通过强力弹簧固定 和密封在上绝缘、 法兰圆筒、 下绝缘和底座内; 在上绝缘的顶部设有使套管内 部始终保持微正压的金属膨胀器。 本发明中, 下绝缘用高强度玻璃钢筒代替瓷套, 法兰和法兰圆筒焊接, 法 兰圆筒和下绝缘浇注为一体, 底座胶装在下绝缘上, 电容芯子通过底座固定和 密封, 整个套管油中为一体, 且保证密封, 避免瓷件因压力过高发生渗漏或炸 裂, 危害设备和人身安全。
金属膨胀器采用双波纹结构, 金属膨胀器包括下法兰、 上法兰、 径向波纹 和轴向波纹, 径向波纹的一端与上法兰连接, 另一端与轴向波纹的上端连接; 轴向波纹的下端与下法兰连接。 金属膨胀器内通向下绝缘方向设有圆环台阶。 圆环台阶高出属膨胀器底平 面 20mm。 在安装法兰上设有直接与取油样针管相连的取油样装置。
本发明中, 在套管头部用一双波纹金属膨胀器代替传统的油枕, 金属膨胀 器作为套管的储油部件, 供套管内绝缘油热胀冷缩用, 使套管内部始终保持微 正压; 当套管内部因故障出现压力升高时, 头部金属膨胀器先动作, 可有效避 免套管爆炸事故的发生; 套管金属膨胀器内通向套管主体设圆环台阶, 除圆环 台阶和套管主体连通外, 整个套管仍处于密封状态, 圆环台阶高于底平面约 20mm, 在膨胀器动作后仍能保证套管短时间内的安全运行。
安装法兰上还有取油样装置, 微正压状态下可以直接同取油针管相连, 无 需放气, 非常方便。
附图说明 图 1是本发明防爆炸起火油纸变压器套管结构示意图; 图 2是图 1中 A部局部放大示意图; 图 3是本发明中金属膨胀器的另一种结构示意图; 图 4是图 1中 B部局部放大示意图。 具体实施方式 下面结合附图对本发明作进一步说明。 一种防爆炸起火油纸电容式变压器套管, 见图 1, 该套管包括接线端子 1、 金属膨胀器 2、 上绝缘 3、 安装法兰 4、 法兰圆筒 5、 下绝缘 6、 底座 7、 导电杆 12和电容芯子 8, 电容芯子 8作为主绝缘, 通过强力弹簧 9和部件间密封件使 套管整体密封。 套管下绝缘 6用高强度玻璃钢绝缘筒代替, 安装法兰 4和法兰 圆筒 5焊接, 瓷套法兰圆筒 5和下绝缘 6浇注为一体, 底座 7胶装在下绝缘 6上, 电容芯子 8通过底座 7固定和密封; 套管头部设用一双波纹金属膨胀器 2代替 传统的油枕, 使产品内部始终保持微正压; 见图 2, 金属膨胀器采用双波纹结 构, 金属膨胀器 2包括下法兰 23、 上法兰 24、 径向波纹 21和轴向波纹 22, 径 向波纹的一端与上法兰连接, 另一端与轴向波纹的上端连接; 轴向波纹的下端 与下法兰连接。 金属膨胀器内通向套管主体设有圆环台阶 10, 圆环台阶高于底 平面约 20mm。 图 3是本发明中金属膨胀器的另一种结构示意图, 将弹簧固定结 构替换为用螺栓通过法兰固定的结构。 套管安装法兰 4上有取油装置 11, 可以 直接同取油样针管相连, 见图 4。 本发明中, 金属膨胀器作为套管的储油部件, 供套管内绝缘油热胀冷缩用, 使套管内部始终保持微正压; 当套管内部因故障出现压力升高时, 头部金属膨 胀器先动作, 可有效避免套管爆炸事故的发生; 套管金属膨胀器内通向套管主 体设圆环台阶, 除圆环台阶和套管主体连通外, 整个套管仍处于密封状态, 在 膨胀器动作后仍能保证套管短时间内的安全运行。

Claims

1. 一种防爆炸起火油纸电容式变压器套管, 包括接线端子 (1 ) 、 上绝缘
( 3) 、 安装法兰 (4) 、 法兰圆筒 (5) 、 下绝缘 (6) 、 底座 (7) 、 导电 杆 (12) 和电容芯子 (8) , 其特征在于: 所述下绝缘 (6) 为玻璃钢筒, 安 装法兰 (4) 与法兰圆筒 (5) 固定在一起, 法兰圆筒 (5) 和下绝缘 (6) 浇 注为一体; 底座 (7) 胶装在下绝缘 (6) 上; 作为主绝缘的电容芯子 (8) 通过强力弹簧 (9) 固定和密封在上绝缘 (3) 、 法兰圆筒 (5) 、 下绝缘
(6) 和底座 (7) 内; 在上绝缘 (3) 的顶部设有使套管内部始终保持微正 压的金属膨胀器 (2)
2. 根据权利要求 1所述的防爆炸起火油纸电容式变压器套管, 其特征在于: 金 属膨胀器 (2) 采用双波纹结构, 金属膨胀器 (2) 包括下法兰 (23) 、 上法 兰 (24) 、 径向波纹 (21 ) 和轴向波纹 (22) , 径向波纹 (21 ) 的一端与上 法兰 (24) 连接, 另一端与轴向波纹 (22) 的上端连接; 轴向波纹 (22) 的 下端与下法兰 (23) 连接。
3. 根据权利要求 1所述的防爆炸起火油纸电容式变压器套管, 其特征在于: 金 属膨胀器 (2) 内通向下绝缘 (6) 方向设有圆环台阶 (10)
4. 根据权利要求 3所述的防爆炸起火油纸电容式变压器套管, 其特征在于: 圆 环台阶 (10) 高出属膨胀器 (2) 底平面 20
5. 根据权利要求 1所述的防爆炸起火油纸电容式变压器套管, 其特征在于: 在 安装法兰 (4) 上设有直接与取油样针管相连的取油样装置 (11 )
PCT/CN2013/088914 2013-09-11 2013-12-10 一种防爆炸起火油纸电容式变压器套管 WO2015035717A1 (zh)

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