WO2018035756A1 - 一种半封闭干式互感器 - Google Patents
一种半封闭干式互感器 Download PDFInfo
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- WO2018035756A1 WO2018035756A1 PCT/CN2016/096539 CN2016096539W WO2018035756A1 WO 2018035756 A1 WO2018035756 A1 WO 2018035756A1 CN 2016096539 W CN2016096539 W CN 2016096539W WO 2018035756 A1 WO2018035756 A1 WO 2018035756A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
Definitions
- the invention relates to the technical field of transformers, in particular to a semi-closed dry transformer.
- Partial discharge refers to the discharge that occurs in a local range under the action of a sufficient electric field of the insulating medium of the power equipment, which only causes the insulation between the conductors to be short-circuited locally without forming a conductive path. The energy of this discharge is small, so its short-term presence does not affect the dielectric strength of electrical equipment.
- the partial discharge measurement standard for semi-closed cast voltage transformers in China is to allow the apparent discharge amount to be ⁇ 20pC.
- the existing semi-closed cast voltage transformers may form insulation defects due to materials, manufacturing and installation processes, and suffering from poor working conditions, resulting in partial discharge of the voltage transformer > 20 pC, so that the voltage transformer has low safety performance. Defects with short service life and unstable working conditions.
- a semi-closed dry transformer including a transformer casting body, wherein the left and right sides of the bottom of the transformer casting body are fixed with a mounting panel, the mutual inductance
- the outer wall of the potting body is sleeved with an outer iron core, and the outer iron core comprises a core wire a ring, a top plate and a bottom portion of the iron core coil are provided with a guard plate, and the four corners of the two sets of guard plates are connected by a fixing screw, and the terminal is inserted into the top left and right sides of the transformer casting body
- the outer wall of the binding post is provided with an insulator, the top of the binding post is provided with a busbar terminal block, the top of the mounting panel is provided with a junction box, and the top of the junction box is inserted with a low voltage lead, and the other end of the low voltage lead penetrates
- the external iron core is connected to the outer wall of the transformer casting body.
- the inner cavity of the transformer casting body is provided with a coiler
- the top of the coiler is provided with an epoxy cylinder
- the top of the epoxy cylinder is provided with a secondary coil
- the top of the secondary coil is separated by a top
- the plate is provided with two sets of opposite primary coils, and the top of each set of primary coils is provided with a high voltage lead, the top of the high voltage lead is provided with an appearance port, the bottom of the coil is plugged with a lead, and the other end of the lead Connected to the outer wall of the terminal, one end of the low voltage lead is connected to the outer wall of the terminal.
- the inner cavity of the terminal is provided with a dry insulating medium, and a center of the inner cavity of the dry insulating medium is provided with a voltage equalizing capacitor, and the top of the voltage equalizing capacitor is connected to the bottom of the bus bar through the shielding ring,
- the outer wall of the voltage equalizing capacitor is wound with a voltage dividing resistor string, the bottom of the voltage equalizing capacitor is provided with a wiring port, the bottom of the terminal is provided with a base, and the bottom of the base is provided with a mounting bar.
- the mounting panel is an L-shaped right angle insulating plate.
- the outlet port penetrates through the mounting bar and the inner cavity of the base and the connection port, and the base of the mounting bar is disposed on the top of the inner cavity of the transformer casting body.
- the voltage equalizing capacitor is composed of at least four identical capacitors, and each group of voltage equalizing capacitors is wound with a voltage dividing resistor, and the end face flange of each group of capacitors is provided with a connection interface.
- the beneficial effects of the invention are: the semi-closed dry transformer, the transformer body adopts a pouring integrated structure, a fully enclosed structure, has the characteristics of maintenance-free, full working condition, and is capacitive under load conditions.
- the core is not saturated, effectively preventing the occurrence of resonant vibration in the line, safe operation, reducing the possibility of cracks and cracks inside the product, and not only improving the finished product of the voltage transformer manufacturing.
- Figure 1 is a schematic structural view of the present invention
- Figure 2 is a right side view of the structure of the present invention.
- FIG. 3 is a schematic structural view of a terminal of the present invention.
- FIG. 4 is a schematic view showing the structure of a coil former of the present invention.
- the present invention provides a technical solution: a semi-closed dry transformer, including a transformer casting body 1, which greatly improves the insulation performance of the voltage transformer casting body, the transformer casting body 1
- the mounting panel 2 is fixed to the left and right sides of the bottom by mounting screws 3, and the mounting panel 2 is L-shaped
- the angle insulating plate when the transformer is working, provides the insulation property and provides good stability to the device.
- the outer wall of the transformer casting body 1 is sleeved with the outer iron core 4, and the outer iron core 4 includes
- the core coil 41 is provided with a shield 42 at the top and the bottom of the core coil 41, and the four corners of the two sets of shields 42 are connected by fixing screws 43 on the left and right sides of the top of the transformer casting body 1.
- the terminal 7 is plugged, the outer wall of the terminal 7 is provided with an insulator 8, the top of the terminal 7 is mounted with a busbar terminal 9, the top of the mounting panel 2 is provided with a junction box 5, and the junction box 5
- the top of the low-voltage lead 6 is connected to the outer wall of the transformer casting body 1 through the outer core 4.
- the inner cavity of the transformer casting body 1 is provided with a coiler 11, the top of the coiler 11 is provided with an epoxy cylinder 12, and the top of the epoxy cylinder 12 is provided with a secondary coil 13, the second
- the top of the secondary coil 13 is provided with two sets of opposite primary coils 14 through the partition 19, which effectively increases the overvoltage multiple and has strong anti-saturation capability, and the top of each set of primary coils 14 is provided with high-voltage leads 15 having magnetic circuit symmetry.
- the characteristics of small magnetic resistance and low loss ensure the safety and stability of the transformer.
- the top of the high voltage lead 15 is provided with an outlet port 16, the bottom of the coil 11 is plugged with a lead 17, and the lead 17 is further One end is connected to the outer wall of the terminal 18, and one end of the low-voltage lead 6 is connected to the outer wall of the terminal 18.
- the voltage in the low-voltage lead 6 is introduced into the inside of the coiler 11 via the lead 17 by the connection of the terminal 18.
- the inner cavity of the terminal 7 is provided with a dry insulating medium 71 to ensure that the insulating medium does not damage the internal components after curing, and has suitable mechanical strength to ensure that the insulating medium after curing can provide insulation support for the internal device, ensuring
- the insulating property of the insulating medium operating at a high voltage, and suitable heat dissipation performance ensure that the insulating medium can transfer the heat generated by the voltage dividing resistor faster, and the pressure equalizing capacitor 72 is disposed at the center of the inner cavity of the dry insulating medium 71.
- the top of the voltage equalizing capacitor 72 is connected to the bottom of the bus bar 9 through the shield ring 91.
- the bus bar 9 provides a multi-circuit common line, which is a bus conductor for incoming and outgoing power, and the outer wall of the voltage equalizing capacitor 72 is wound. Voltage dividing resistor string 73, the voltage equalizing capacitor The bottom of the 72 is provided with a wiring port 74, the bottom of which is provided with a base 75, and the bottom of the base 75 is provided with a mounting strip 76.
- the outlet port 16 is connected to the connection port 74 through the inner cavity of the mounting bar 76 and the base 75, and the base 75 of the mounting bar 76 is disposed on the top of the inner cavity of the transformer casting body 1.
- the voltage equalizing capacitor 72 is At least the same four sets of capacitors are formed, and each set of voltage equalizing capacitors 72 is wound with a voltage dividing resistor, and the end face flange of each set of capacitors is provided with a connection interface, and multi-section resistors and voltage equalizing capacitors are assembled according to different voltage levels. 72.
- the RC unit When the RC unit is assembled into the inner cavity of the terminal 7, the low-voltage end is isolated by a dry insulating medium 71 to extract a secondary voltage dividing signal line.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulating Of Coils (AREA)
Abstract
一种半封闭干式互感器，包括互感器浇筑体（1），所述互感器浇筑体（1）的底部左右两侧均通过安装螺钉（3）固定有安装面板（2），所述互感器浇筑体（1）的外壁套接有外置铁芯（4），所述外置铁芯（4）包括铁芯线圈（41），所述铁芯线圈（41）的顶部和底部均设置有护板（42），且两组护板的四角处通过固定螺钉（43）连接，所述互感器浇筑体（1）的顶部左右两侧均插接有接线柱（7），所述接线柱（7）的外壁设置有绝缘子（8），所述接线柱（7）的顶部安装有母线接线排（9），所述安装面板（2）的顶部设置有接线盒（5），且接线盒（5）的顶部插接有低压引线（6），该半封闭干式互感器，变压器本体采用浇注一体化结构，全封闭结构，具有免维护、全工况的特点，负载条件下呈容性，铁芯不饱和，在线路中有效防止了谐振振动的发生，运行安全。
Description
本发明涉及互感器技术领域，具体为一种半封闭干式互感器。
目前，随着我国经济的高速发展和人们生活水平的不断提高，人们对电力的依赖程度越来越大，互感器作为电力系统中的一个关键设备，互感器质量的好坏，将直接影响电力系统的可靠运行，然而，局部放电问题一直是困扰干式电压互感器生产的一个难题。局部放电是指电力设备绝缘介质在足够的电场作用下局部范围内发生的放电，仅造成导体间的绝缘局部短接而不形成导电通道。这种放电的能量是很小的，所以它的短时存在并不影响到电气设备的绝缘强度。但若电气设备绝缘在运行电压下不断出现局部放电，这些微弱的放电将产生积累效应使绝缘的介电性能逐渐劣化并使局部缺陷扩大，最后导致整个绝缘击穿。然而，我国对半封闭浇注式电压互感器的局部放电测量标准为允许视在放电量≤20pC。但是现有的半封闭浇注式电压互感器由于材质、制造安装工艺、遭受不良工况等原因会形成绝缘缺陷，造成该电压互感器局部放电量>20pC，从而该电压互感器存在安全性能低、使用寿命短、工作状态不稳定的缺陷。
发明内容
本发明的目的在于提供一种半封闭干式互感器，以解决上述背景技术中提出的问题。
为实现上述目的，本发明提供如下技术方案：一种半封闭干式互感器，包括互感器浇筑体，所述互感器浇筑体的底部左右两侧均通过安装螺钉固定有安装面板，所述互感器浇筑体的外壁套接有外置铁芯，所述外置铁芯包括铁芯线
圈，所述铁芯线圈的顶部和底部均设置有护板，且两组护板的四角处通过固定螺钉连接，所述互感器浇筑体的顶部左右两侧均插接有接线柱，所述接线柱的外壁设置有绝缘子，所述接线柱的顶部安装有母线接线排，所述安装面板的顶部设置有接线盒，且接线盒的顶部插接有低压引线，所述低压引线的另一端贯穿外置铁芯连接到互感器浇筑体的外壁。
其中，所述互感器浇筑体的内腔设置有线圈器，所述线圈器的顶部设置有环氧筒，所述环氧筒的顶部设置有二次线圈，所述二次线圈的顶部通过隔板设置有两组相对的一次线圈，且每组一次线圈的顶部均设置有高压引线，所述高压引线的顶部设置有出现端口，所述线圈器的底部插接有引线，且引线的另一端与接线端子的外壁连接，所述低压引线的一端与接线端子的外壁连接。
其中，所述接线柱的内腔设置有干式绝缘介质，且干式绝缘介质的内腔中心处设置有均压电容器，所述均压电容器的顶部贯穿屏蔽环与母线接线排的底部连接，所述均压电容器的外壁缠绕有分压电阻串，所述均压电容器的底部设置有接线端口，所述接线柱的底部设置有底座，且底座的底部设置有安装条。
其中，所述安装面板为L型直角绝缘板。
其中，所述出线端口贯穿安装条和底座的内腔与接线端口相配合连接，且安装条的底座均设置在互感器浇筑体的内腔顶部。
其中，所述均压电容器由最少为相同的四组电容器组成，且每组均压电容器均缠绕有分压电阻，且每组电容器的端面法兰设有连接接口。
与现有技术相比，本发明的有益效果是：该半封闭干式互感器，变压器本体采用浇注一体化结构，全封闭结构，具有免维护、全工况的特点，负载条件下呈容性，铁芯不饱和，在线路中有效防止了谐振振动的发生，运行安全，减少了产品内部出现裂纹与龟裂的可能，不仅提高了该电压互感器的制造的成品
率，而且大大提高了浇注体器身的绝缘强度，使整个电压互感器的使用寿命大大延长，并同时提高了该电压互感器的安全性能，干式绝缘介质，保证绝缘介质固化后不至破坏内部元器件，其具有的合适的机械强度保证固化后的绝缘介质能为内部器件提供绝缘支撑，保证绝缘介质在高电压下工作的绝缘性能，并且合适的散热性能保证绝缘介质能较快将分压电阻产生的热量向外传递。
图1为本发明结构示意图；
图2为本发明的结构右视图；
图3为本发明的接线柱结构示意图；
图4为本发明的线圈器结构示意图。
图中：1互感器浇筑体、11线圈器、12环氧筒、13二次线圈、14一次线圈、15高压引线、16出线端口、17引线、18接线端子、19隔板、2安装面板、3安装螺钉、4外置铁芯、41铁芯线圈、42护板、43固定螺钉、5接线盒、6低压引线、7接线柱、71干式绝缘介质、72均压电容器、73分压电阻串、74接线端口、75底座、76安装条、8绝缘子、9母线接线排、91屏蔽环。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图1-4，本发明提供一种技术方案：一种半封闭干式互感器，包括互感器浇筑体1，大大提高了电压互感器浇筑体的绝缘性能，所述互感器浇筑体1的底部左右两侧均通过安装螺钉3固定有安装面板2，所述安装面板2为L型直
角绝缘板，互感器工作时，提供绝缘特性的同时，给装置提供很好的稳定性，所述互感器浇筑体1的外壁套接有外置铁芯4，所述外置铁芯4包括铁芯线圈41，所述铁芯线圈41的顶部和底部均设置有护板42，且两组护板42的四角处通过固定螺钉43连接，所述互感器浇筑体1的顶部左右两侧均插接有接线柱7，所述接线柱7的外壁设置有绝缘子8，所述接线柱7的顶部安装有母线接线排9，所述安装面板2的顶部设置有接线盒5，且接线盒5的顶部插接有低压引线6，所述低压引线6的另一端贯穿外置铁芯4连接到互感器浇筑体1的外壁。
其中，所述互感器浇筑体1的内腔设置有线圈器11，所述线圈器11的顶部设置有环氧筒12，所述环氧筒12的顶部设置有二次线圈13，所述二次线圈13的顶部通过隔板19设置有两组相对的一次线圈14，有效提高了过电压倍数，抗饱和能力强，且每组一次线圈14的顶部均设置有高压引线15，具有磁路对称、磁阻小和损耗小的特点，保证了互感器的安全稳定性，所述高压引线15的顶部设置有出线端口16，所述线圈器11的底部插接有引线17，且引线17的另一端与接线端子18的外壁连接，所述低压引线6的一端与接线端子18的外壁连接，通过接线端子18的连接作用，将低压引线6中的电压经引线17引入到线圈器11的内部。
所述接线柱7的内腔设置有干式绝缘介质71，保证绝缘介质固化后不至破坏内部元器件，其具有的合适的机械强度保证固化后的绝缘介质能为内部器件提供绝缘支撑，保证绝缘介质在高电压下工作的绝缘性能，并且合适的散热性能保证绝缘介质能较快将分压电阻产生的热量向外传递，且干式绝缘介质71的内腔中心处设置有均压电容器72，所述均压电容器72的顶部贯穿屏蔽环91与母线接线排9的底部连接，其中母线接线排9提供多回路公用线路,是进出电的汇流导体，所述均压电容器72的外壁缠绕有分压电阻串73，所述均压电容器
72的底部设置有接线端口74，所述接线柱7的底部设置有底座75，且底座75的底部设置有安装条76。
所述出线端口16贯穿安装条76和底座75的内腔与接线端口74相配合连接，且安装条76的底座75均设置在互感器浇筑体1的内腔顶部，所述均压电容器72由最少为相同的四组电容器组成，且每组均压电容器72均缠绕有分压电阻，且每组电容器的端面法兰设有连接接口,根据不同电压等级的需要拼装多节电阻和均压电容器72，阻容单元装配进接线柱7的内腔时，低压端应用干式绝缘介质71进行隔离，以引出二次分压信号线。
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。
Claims (6)
- 一种半封闭干式互感器，包括互感器浇筑体，所述互感器浇筑体的底部左右两侧均通过安装螺钉固定有安装面板，其中：所述互感器浇筑体的外壁套接有外置铁芯，所述外置铁芯包括铁芯线圈，所述铁芯线圈的顶部和底部均设置有护板，且两组护板的四角处通过固定螺钉连接，所述互感器浇筑体的顶部左右两侧均插接有接线柱，所述接线柱的外壁设置有绝缘子，所述接线柱的顶部安装有母线接线排，所述安装面板的顶部设置有接线盒，且接线盒的顶部插接有低压引线，所述低压引线的另一端贯穿外置铁芯连接到互感器浇筑体的外壁。
- 根据权利要求1所述的一种半封闭干式互感器，其中：所述互感器浇筑体的内腔设置有线圈器，所述线圈器的顶部设置有环氧筒，所述环氧筒的顶部设置有二次线圈，所述二次线圈的顶部通过隔板设置有两组相对的一次线圈，且每组一次线圈的顶部均设置有高压引线，所述高压引线的顶部设置有出线端口，所述线圈器的底部插接有引线，且引线的另一端与接线端子的外壁连接，所述低压引线的一端与接线端子的外壁连接。
- 根据权利要求1所述的一种半封闭干式互感器，其中：所述接线柱的内腔设置有干式绝缘介质，且干式绝缘介质的内腔中心处设置有均压电容器，所述均压电容器的顶部贯穿屏蔽环与母线接线排的底部连接，所述均压电容器的外壁缠绕有分压电阻串，所述均压电容器的底部设置有接线端口，所述接线柱的底部设置有底座，且底座的底部设置有安装条。
- 根据权利要求1所述的一种半封闭干式互感器，其中：所述安装面板为L型直角绝缘板。
- 根据权利要求1所述的一种半封闭干式互感器，其中：所述出线端口贯 穿安装条和底座的内腔与接线端口相配合连接，且安装条的底座均设置在互感器浇筑体的内腔顶部。
- 根据权利要求1所述的一种半封闭干式互感器，其中：所述均压电容器由最少为相同的四组电容器组成，且每组均压电容器均缠绕有分压电阻，且每组电容器的端面法兰设有连接接口。
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