WO2024055365A1 - 一种可靠性极高的三相不一致保护器 - Google Patents

一种可靠性极高的三相不一致保护器 Download PDF

Info

Publication number
WO2024055365A1
WO2024055365A1 PCT/CN2022/122524 CN2022122524W WO2024055365A1 WO 2024055365 A1 WO2024055365 A1 WO 2024055365A1 CN 2022122524 W CN2022122524 W CN 2022122524W WO 2024055365 A1 WO2024055365 A1 WO 2024055365A1
Authority
WO
WIPO (PCT)
Prior art keywords
box
box body
circuit
phase
contact group
Prior art date
Application number
PCT/CN2022/122524
Other languages
English (en)
French (fr)
Inventor
杨家凯
杨杰
杨伟
段军鹏
代显忠
沈燚
徐正佼
刘晶晶
李春利
刘根
谭武光
罗玉花
段海和
唐建忠
李家保
刘华
王培县
林恩彬
张航
陈有忠
周园
郭浩钰
杜直珊
汤晗
普朝健
Original Assignee
云南电网有限责任公司楚雄供电局
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 云南电网有限责任公司楚雄供电局 filed Critical 云南电网有限责任公司楚雄供电局
Publication of WO2024055365A1 publication Critical patent/WO2024055365A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/14—Terminal arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Definitions

  • the invention relates to the technical field of circuit equipment, specifically a highly reliable three-phase inconsistent protector.
  • the three-phase inconsistency protector is a protective circuit device commonly used in power systems. It can prevent the negative sequence component in the system caused by the three-phase inconsistency of the floor-standing tank circuit breaker, thereby maintaining the stability of the power system. In order to reduce the harm caused to the system when the three-phase inconsistency of the circuit breaker occurs, the three-phase inconsistency protection (non-all-phase protection) of the circuit breaker should be installed, and the circuit breaker with three-phase inconsistency will be taken out of operation to ensure the normal operation of the system.
  • Today's three-phase inconsistency protectors have an integrated structure. After damage, they need to be replaced as a whole, which increases maintenance costs.
  • the purpose of the present invention is to provide a highly reliable three-phase inconsistent protector to solve the problems raised in the above background technology.
  • a highly reliable three-phase inconsistency protector which includes a box body with an open side and a box cover arranged on one side of the box body.
  • the edge of the opening side of the box body is provided with a number of fixed plugs arranged evenly and equidistantly.
  • the edge of the box cover is provided with fixed sockets that have the same number, corresponding position, matching size and plug-in fit as the fixed sockets; the inner side wall of the box body is equipped with a desiccant-filled hole.
  • a drying box, the outer wall of the drying box is a mesh structure; a transparent observation window is embedded in the outer wall of the lid.
  • one end of the box body away from the opening is provided with a plurality of fixing ears symmetrically on both sides, and each fixing ear is provided with a fixing hole.
  • a circuit board is installed in the box, and the circuit board includes a three-phase inconsistency protection circuit.
  • the three-phase inconsistency protection circuit includes a starting loop, an outlet loop and a tripping loop.
  • the starting loop is connected to the positive electrode KM+ of the power supply. and the negative electrode KM-, including a normally closed contact group, a normally open contact group and a time relay SJ connected in series.
  • the normally closed contact group includes three-phase parallel normally closed contacts QFA1, QFB1, QFC1, and a normally open contact group.
  • the point group includes three-phase parallel normally open contacts QFA2, QFB2, and QFC2.
  • the outlet circuit includes a parallel time relay SJ1 and a time relay SJ2.
  • the time relay SJ2 is connected in series with a filter LP and a trip relay TJ.
  • the input end of the trip circuit is connected to a start-up circuit between the opening normally closed contact group and the closing normally open contact group.
  • the input end of the outlet circuit is connected to the starting circuit between the closing normally open contact group and the time relay SJ.
  • the protector is divided into a box body and a box cover, and the box body and the box cover are connected through fixed plug-in posts and fixed jacks to facilitate installation. Or it can be disassembled and the interior can be inspected regularly.
  • the drying box installed in the box can absorb water vapor in the internal air to prevent corrosion of internal parts and extend the service life.
  • the normally open contact S positive end of the time relay SJ1 is connected in parallel to its starting circuit to ensure that the positive end of the contact is charged only when starting. Fundamentally This avoids the problem of contact misoperation.
  • the start-up circuit of the trip relay After the start-up circuit of the trip relay is changed, it must meet two conditions before it can start: the position of the split-phase circuit breaker is inconsistent or the time relay SJ1 acts; the two start-up conditions verify each other, effectively preventing the unreliability of individual relays.
  • the resulting protection malfunction has greatly improved the safety and reliability of power supply for power grids of 220 kV and above.
  • Figure 1 is a schematic structural diagram of the present invention
  • Figure 2 is a schematic front structural view of the box body of the present invention.
  • FIG. 3 is an electrical schematic diagram of the present invention.
  • Figure 4 is an electrical schematic diagram of connecting a signal relay according to the present invention.
  • a highly reliable three-phase inconsistency protector as shown in Figures 1 and 2, includes a box body 10 with an open side and a box cover 20 arranged on one side of the box body 10.
  • the box body 10 has an open side.
  • a number of fixed plugs 13 arranged evenly and equidistantly are provided on the edge.
  • the edge of the box cover 20 is provided with fixed sockets that have the same number, corresponding position, matching size and plug-in matching as the fixed plugs 13; the box body 10 has A drying box 14 filled with desiccant 15 is installed on the inner side wall.
  • the outer wall of the drying box 14 has a mesh structure; a transparent observation window 21 is embedded in the outer wall of the box cover 20.
  • the protector is divided into a box body 10 And the box cover 20, and the box body 10 and the box cover 20 are plugged and matched through the fixed plug 13 and the fixed jack, which is convenient for installation or disassembly, and the interior can be inspected regularly.
  • the drying box 14 provided in the box body 10 can absorb water vapor in the internal air to prevent corrosion of internal parts and extend service life.
  • a plurality of fixing ears 11 are symmetrically arranged on both sides of the end of the box body 10 away from the opening.
  • Each fixing ear 11 is provided with a fixing hole 12.
  • the fixed ears 11 and the fixing holes 12 are provided to facilitate installation or disassembly.
  • a circuit board is installed in the box 10, and the circuit board includes a three-phase inconsistency protection circuit, as shown in Figures 3 and 4.
  • the three-phase inconsistency protection circuit includes a starting loop, an outlet loop and a tripping loop.
  • the starting loop is connected to Between the positive terminal KM+ and the negative terminal KM- of the power supply, there are a normally closed contact group, a normally open contact group and a time relay SJ connected in series.
  • the normally closed contact group includes three-phase parallel normally closed contacts QFA1, QFB1 and QFC1.
  • the normally open contact group includes three-phase parallel normally open contacts QFA2, QFB2, and QFC2.
  • the outlet circuit includes parallel time relay SJ1 and time relay SJ2. Time relay SJ2 is connected in series with filter LP and trip relay TJ.
  • the input end of the tripping circuit is connected to the starting circuit between the opening normally closed contact group and the closing normally open contact group.
  • the input end of the outlet circuit is connected to the starting circuit between the closing normally open contact group and the time relay SJ.
  • the working principle of the highly reliable three-phase inconsistent protector of the present invention is as follows: the operator installs the parts required for the three-phase inconsistent protection circuit on the circuit board, and fixes the circuit board inside the box body 10.
  • the drying box 14 containing the desiccant 15 is bonded to the inner wall, and the box body 10 and the box cover 20 are plugged and matched through the fixed plug 13 and the fixed jack, and then it can be used;
  • the working principle of the three-phase inconsistency protection circuit connect the input end of the tripping circuit to the starting circuit on the output side of the opening normally closed contact group, and connect the output end to the negative pole of the power supply, so that only at least one of the opening normally closed contact group
  • the input end of the outlet circuit can be connected to the positive pole of the power supply, and the outlet circuit can operate normally, which can avoid malfunction of the time relay or tripping relay.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Patch Boards (AREA)

Abstract

本发明涉及电路设备技术领域，具体为一种可靠性极高的三相不一致保护器，包括侧面为开口状态的盒体和设置于盒体一侧的盒盖，盒体开口一侧边缘开设有若干均匀等距排列的固定插柱，盒盖的边缘开设有与固定插柱数量相同、位置相对应、尺寸相适配且插接配合的固定插孔；盒体的内部侧壁上安装有内部装满干燥剂的干燥盒，干燥盒的外壁为网状结构；盒盖的外壁上嵌设有透明观察窗。本发明通过将保护器分为盒体和盒盖，且盒体和盒盖之间通过固定插柱和固定插孔插接配合，便于进行安装或拆卸，可定期对内部进行检修，盒体内设置的干燥盒，可以将内部空气中的水蒸汽吸收，防止腐蚀内部零件，延长使用寿命。

Description

一种可靠性极高的三相不一致保护器 技术领域
本发明涉及电路设备技术领域，具体为一种可靠性极高的三相不一致保护器。
背景技术
三相不一致保护器是电力系统中常用的一种保护电路设备，其可以防止因落地罐式断路器的三相不一致而导致系统出现负序分量，从而维持电力系统稳定。为减小断路器三相不一致时对系统造成的危害，应装设断路器三相不一致保护(非全相保护)，将出现三相不一致的断路器退出运行，保证系统的正常运行。现如今的三相不一致保护器为一体式的结构，损坏后需要整体进行更换，增加维修成本。
发明内容
本发明的目的在于提供一种可靠性极高的三相不一致保护器，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：
一种可靠性极高的三相不一致保护器，包括侧面为开口状态的盒体和设置于盒体一侧的盒盖，所述盒体开口一侧边缘开设有若干均匀等距排列的固定插柱，所述盒盖的边缘开设有与固定插柱数量相同、位置相对应、尺寸相适配且插接配合的固定插孔；所述盒体的内部侧壁上安装有内部装满干燥剂的干燥盒，所述干燥盒的外壁为网状结构；所述盒盖的外壁上嵌设有透明观察窗。
作为优选，所述盒体远离开口的一端两侧对称设置有多个固定耳，每个所述固定耳上开设有固定孔。
作为优选，所述盒体内安装有电路板，所述电路板上包括三相不一致保护电路，所述三相不一致保护电路包括启动回路、出口回路和跳闸回路，所述启动回路连接在电源正极KM+和负极KM-之间，包括依次串联的常闭触点组、常开触点组和时间继电器SJ，常闭触点组包括三相并联的常闭触点QFA1、QFB1、QFC1，常开触点组包括三相并联的常开触点QFA2、QFB2、QFC2，所述出口回路包括并联的时间继电器SJ1、时间继电器SJ2，所述时间继电器SJ2串联有滤波器LP和跳闸继电器TJ。
作为优选，所述跳闸回路的输入端连接在分闸常闭触点组与合闸常开触点组之间的启动回路上。
作为优选，所述出口回路的输入端连接在合闸常开触点组与时间继电器SJ之间的启动回路上。
与现有技术相比，本发明的有益效果是：
1、本可靠性极高的三相不一致保护器中，通过将保护器分为盒体和盒盖，且盒体和盒盖之间通过固定插柱和固定插孔插接配合，便于进行安装或拆卸，可定期对内部进行检修，盒体内设置的干燥盒，可以将内部空气中的水蒸汽吸收，防止腐蚀内部零件，延长使用寿命。
2、本可靠性极高的三相不一致保护器中，将时间继电器SJ1的常开触点S正电端并联到其启动回路上，保证其只有在启动时接点正电端才带电，从根本上避免了接点误动问题，跳闸继电器的启动回路改动之后需满足两个条件才能启动：分相断路器位置不一致或时间继电器SJ1动作；两个启动条件互相校验，有效防止由于个别继电器不可靠导致的保护误动，极大程度提高了220千伏及以上电网的供电安全性及可靠性
附图说明
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本 发明的实施例一起做进一步的详细解释，但并不构成对本发明的限制。
图1为本发明的结构示意图；
图2为本发明盒体的主视结构示意图；
图3为本发明的电气原理图；
图4为本发明连接信号继电器的电气原理图。
图中各标号的含义：
10、盒体；11、固定耳；12、固定孔；13、固定插柱；14、干燥盒；15、干燥剂；
20、盒盖；21、观察窗；22、固定座；
具体实施方式
下面将结合本发明实施例和说明书附图，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。
一种可靠性极高的三相不一致保护器，如图1和图2所示，包括侧面为开口状态的盒体10和设置于盒体10一侧的盒盖20，盒体10开口一侧边缘开设有若干均匀等距排列的固定插柱13，盒盖20的边缘开设有与固定插柱13数量相同、位置相对应、尺寸相适配且插接配合的固定插孔；盒体10的内部侧壁上安装有内部装满干燥剂15的干燥盒14，干燥盒14的外壁为网状结构；盒盖20的外壁上嵌设有透明观察窗21，通过将保护器分为盒体10和盒盖20，且盒体10和盒盖20之间通过固定插柱13和固定插孔插接配合，便于进行安装或拆卸，可定期对内部进行检修，盒体10内设置的干燥盒14，可以将内部空气中的水蒸汽吸收，防止腐蚀内部零件，延长使用寿命。
进一步，盒体10远离开口的一端两侧对称设置有多个固定耳11，每个固 定耳11上开设有固定孔12，通过设置的固定耳11和固定孔12便于进行安装或拆卸。
具体的，盒体10内安装有电路板，电路板上包括三相不一致保护电路，如图3和图4所示，三相不一致保护电路包括启动回路、出口回路和跳闸回路，启动回路连接在电源正极KM+和负极KM-之间，包括依次串联的常闭触点组、常开触点组和时间继电器SJ，常闭触点组包括三相并联的常闭触点QFA1、QFB1、QFC1，常开触点组包括三相并联的常开触点QFA2、QFB2、QFC2，出口回路包括并联的时间继电器SJ1、时间继电器SJ2，时间继电器SJ2串联有滤波器LP和跳闸继电器TJ。
值得说明的是，跳闸回路的输入端连接在分闸常闭触点组与合闸常开触点组之间的启动回路上。出口回路的输入端连接在合闸常开触点组与时间继电器SJ之间的启动回路上。
本发明的可靠性极高的三相不一致保护器的工作原理：操作人员将三相不一致保护电路所需的零件安装于电路板上，并将电路板固定于盒体10内部，在盒体10内壁上粘接装有干燥剂15的干燥盒14，并将盒体10和盒盖20之间通过固定插柱13和固定插孔插接配合，即可进行使用；
三相不一致保护电路的工作原理：将跳闸回路的输入端连接在分闸常闭触点组输出侧的启动回路上，输出端与电源负极连接，这样只有在分闸常闭触点组的至少一相分闸常闭触点闭合，即断路器至少一相非正常跳闸时，出口回路的输入端才能导接电源正极，出口回路可正常工作，可避免时间继电器或跳闸继电器发生误动作，而导致跳闸回路导通，导致断路器非正常跳闸，影响断路器的正常工作，将时间继电器SJ1的常开触点S正电端并联到其启动回路上，保证其只有在启动时接点正电端才带电，从根本上避免了接点误动问题，跳闸继电器的启动回路改动之后需满足两个条件才能启动：分相断路器位置不一致或时间继电器SJ1动作；两个启动条件互相校验，有效防止 由于个别继电器不可靠导致的保护误动，极大程度提高了220千伏及以上电网的供电安全性及可靠性。
以上显示和描述了本发明的基本原理、主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的仅为本发明的优选例，并不用来限制本发明，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。

Claims (5)

  1. 一种可靠性极高的三相不一致保护器，包括侧面为开口状态的盒体(10)和设置于盒体(10)一侧的盒盖(20)，其特征在于：所述盒体(10)开口一侧边缘开设有若干均匀等距排列的固定插柱(13)，所述盒盖(20)的边缘开设有与固定插柱(13)数量相同、位置相对应、尺寸相适配且插接配合的固定插孔；
    所述盒体(10)的内部侧壁上安装有内部装满干燥剂(15)的干燥盒(14)，所述干燥盒(14)的外壁为网状结构；所述盒盖(20)的外壁上嵌设有透明观察窗(21)。
  2. 根据权利要求1所述的可靠性极高的三相不一致保护器，其特征在于：所述盒体(10)远离开口的一端两侧对称设置有多个固定耳(11)，每个所述固定耳(11)上开设有固定孔(12)。
  3. 根据权利要求1所述的可靠性极高的三相不一致保护器，其特征在于：所述盒体(10)内安装有电路板，所述电路板上包括三相不一致保护电路，所述三相不一致保护电路包括启动回路、出口回路和跳闸回路，所述启动回路连接在电源正极KM+和负极KM-之间，包括依次串联的常闭触点组、常开触点组和时间继电器SJ，常闭触点组包括三相并联的常闭触点QFA1、QFB1、QFC1，常开触点组包括三相并联的常开触点QFA2、QFB2、QFC2，所述出口回路包括并联的时间继电器SJ1、时间继电器SJ2，所述时间继电器SJ2串联有滤波器LP和跳闸继电器TJ。
  4. 根据权利要求3所述的可靠性极高的三相不一致保护器，其特征在于：所述跳闸回路的输入端连接在分闸常闭触点组与合闸常开触点组之间的启动回路上。
  5. 根据权利要求3所述的可靠性极高的三相不一致保护器，其特征在于：所述出口回路的输入端连接在合闸常开触点组与时间继电器SJ1之间的启动回路上。
PCT/CN2022/122524 2022-09-13 2022-09-29 一种可靠性极高的三相不一致保护器 WO2024055365A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211107484.0A CN115346837A (zh) 2022-09-13 2022-09-13 一种可靠性极高的三相不一致保护器
CN202211107484.0 2022-09-13

Publications (1)

Publication Number Publication Date
WO2024055365A1 true WO2024055365A1 (zh) 2024-03-21

Family

ID=83956875

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/122524 WO2024055365A1 (zh) 2022-09-13 2022-09-29 一种可靠性极高的三相不一致保护器

Country Status (2)

Country Link
CN (1) CN115346837A (zh)
WO (1) WO2024055365A1 (zh)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0684380U (ja) * 1993-05-21 1994-12-02 財団法人関東電気保安協会 地絡継電器の動作試験装置
CN208819806U (zh) * 2018-10-15 2019-05-03 国网内蒙古东部电力有限公司呼伦贝尔供电公司 一种电力继电保护装置
CN213501878U (zh) * 2020-10-26 2021-06-22 深圳快电科技股份有限公司 一种用于汽车便携式充电的3.5kw充电盒
CN213782868U (zh) * 2020-10-12 2021-07-23 成都交大许继电气有限责任公司 一种适用于电气化铁路的保护操作箱
CN216794837U (zh) * 2021-12-31 2022-06-21 浙江易鑫电子科技股份有限公司 一种一体化智能开关模组

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0684380U (ja) * 1993-05-21 1994-12-02 財団法人関東電気保安協会 地絡継電器の動作試験装置
CN208819806U (zh) * 2018-10-15 2019-05-03 国网内蒙古东部电力有限公司呼伦贝尔供电公司 一种电力继电保护装置
CN213782868U (zh) * 2020-10-12 2021-07-23 成都交大许继电气有限责任公司 一种适用于电气化铁路的保护操作箱
CN213501878U (zh) * 2020-10-26 2021-06-22 深圳快电科技股份有限公司 一种用于汽车便携式充电的3.5kw充电盒
CN216794837U (zh) * 2021-12-31 2022-06-21 浙江易鑫电子科技股份有限公司 一种一体化智能开关模组

Also Published As

Publication number Publication date
CN115346837A (zh) 2022-11-15

Similar Documents

Publication Publication Date Title
WO2024055365A1 (zh) 一种可靠性极高的三相不一致保护器
CN109239450A (zh) 计数器安装机构
CN210350507U (zh) 一种便于组装的高低压配电箱
CN211377369U (zh) 一种智能化配电站六氟化硫检测装置
CN209642049U (zh) 一种便于安装的电气配电断路器
CN209822452U (zh) 一种可分离式出线套管
CN208921780U (zh) 计数器安装机构
CN208861900U (zh) 一种便于防潮的漏电保护器
CN201994154U (zh) 全绝缘避雷装置
US10333112B2 (en) Recloser battery assembly
CN213816761U (zh) 一种安全性高的联锁配电箱
CN2899225Y (zh) 断零缺相保护配电箱
CN204391885U (zh) 一种并机板的安装结构
CN204334468U (zh) 一种带防雷失效预警功能的光伏汇流箱
CN2322291Y (zh) 一种迷宫形组装式全封闭套管
CN207705636U (zh) 一种物联网家用配电箱
CN219041081U (zh) 一种具有湿度监测及控制功能的电源错断相智能保护器
CN216015245U (zh) 一种自恢复过欠压保护器
CN220207684U (zh) 电压互感器二次电压引出装置
CN116154666B (zh) 一种上隔离上接地环保气体绝缘环网柜
CN220856488U (zh) 一种电源失压自动脱扣机构
CN208336948U (zh) 一种建筑机电配电箱
CN214227412U (zh) 一种具有泄压结构的开关柜
CN213878885U (zh) 一种继电保护屏柜的绝缘保护装置
CN102610342B (zh) 全绝缘避雷装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22958555

Country of ref document: EP

Kind code of ref document: A1