WO2014156000A1 - 漏電検出引外しユニット - Google Patents

漏電検出引外しユニット Download PDF

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Publication number
WO2014156000A1
WO2014156000A1 PCT/JP2014/001309 JP2014001309W WO2014156000A1 WO 2014156000 A1 WO2014156000 A1 WO 2014156000A1 JP 2014001309 W JP2014001309 W JP 2014001309W WO 2014156000 A1 WO2014156000 A1 WO 2014156000A1
Authority
WO
WIPO (PCT)
Prior art keywords
vent
leakage detection
terminal portion
circuit
housing
Prior art date
Application number
PCT/JP2014/001309
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
佐藤　昌弘
稲次　崇
Original Assignee
パナソニック 株式会社
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 パナソニック 株式会社 filed Critical パナソニック 株式会社
Priority to CN201480016682.3A priority Critical patent/CN105122415A/zh
Publication of WO2014156000A1 publication Critical patent/WO2014156000A1/ja

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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
    • H01H71/08—Terminals; Connections
    • 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
    • H01H71/025—Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • 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
    • H01H9/52—Cooling of switch parts

Definitions

  • the present invention relates to a leakage detection trip unit that is applied to an external trip type earth leakage breaker including a circuit breaker and is externally attached to the circuit breaker.
  • an earth leakage circuit breaker that interrupts an electric circuit when an earth leakage is detected has been proposed (see, for example, Patent Document 1).
  • Some earth leakage circuit breakers have a built-in leakage detection function in the circuit breaker, and others have a built-in leakage detection function in a device external to the circuit breaker. The latter is called an external trip type earth leakage breaker, and the device externally attached to the circuit breaker is called an earth leakage detection trip unit.
  • a circuit breaker has a power supply terminal part on one end side and a load terminal part on the other end side, and a contact part, a trip mechanism part, and a handle for turning on and off the contact part between both terminal parts. And a mechanism part.
  • the leakage detection trip unit has a connection terminal portion on one end side and a load terminal portion on the other end side, and a leakage detection circuit, a main circuit bar serving as an electric circuit, and a leakage detection signal between both terminal portions And a tripping drive unit that drives the tripping mechanism unit of the circuit breaker in response.
  • the connection terminal portion of the leakage detection trip unit is connected to the load terminal portion of the circuit breaker (hereinafter referred to as the connection terminal portion of the circuit breaker).
  • a zero-phase current transformer (hereinafter referred to as “ZCT”) is used for detection of electric leakage by the leakage detection trip unit, and a main circuit bar is passed through this ZCT.
  • ZCT zero-phase current transformer
  • main circuit bar is passed through this ZCT.
  • the leakage detection circuit detects the difference between the current in the forward path and the return path passing through the ZCT. When there is no leakage, the difference is zero. However, when a leakage occurs, a difference occurs between the forward and return currents. This difference is amplified to cut off the electric circuit.
  • One end side of the main circuit bar provided as an alternative to the electric wire forms a connection terminal portion of the leakage detection trip unit, and is fixed to the connection terminal portion of the circuit breaker with a terminal screw.
  • the other end side of the main circuit bar is fixed to a load terminal portion of the leakage detection trip unit via a terminal plate with a terminal screw.
  • the temperature rise of the connection terminal of the circuit breaker when energized is greater than when the circuit breaker alone is energized. For this reason, the temperature rise of the cover in the vicinity of the connection terminal portion of the circuit breaker tends to increase.
  • An object of the present invention is to provide a leakage detection trip unit capable of suppressing a temperature rise in the vicinity of a connection terminal portion of a circuit breaker.
  • the leakage detection trip unit includes a housing, a load terminal connected to the electric wire, a connection terminal connected to the load-side terminal of the circuit breaker, the load terminal and the connection terminal.
  • a main circuit bar provided as an electric circuit to be connected, a leakage detection circuit provided on the path of the main circuit bar to detect leakage, and a circuit breaking operation by driving the circuit breaker when leakage is detected by the leakage detection circuit
  • a tripping drive unit for performing the operation wherein the housing is provided on a side where the load terminal unit is located, and is opposed to the first surface having a first vent and the first surface. And the second surface having the second vent hole, and the main circuit bar is interposed in the flow path from the first vent hole to the second vent hole.
  • the leakage detection trip unit is further provided with a protrusion provided between the first vent and a zero-phase current transformer that constitutes the leakage detection circuit, and narrows the flow path. Also good.
  • the housing may include a housing body that houses the main circuit bar and the leakage detection circuit, and a housing cover that closes an opening of the housing body.
  • the first ventilation port includes a load terminal portion ventilation port provided on a surface of the housing body on which the load terminal portion is located, and the load terminal portion is located on the housing cover. And a bottom vent provided on the side surface.
  • the main circuit bar, the load terminal portion vent and the second vent may be disposed on a line connecting.
  • the leakage detection trip unit may further include a protrusion that is provided between the bottom vent and a zero-phase current transformer that constitutes the leakage detection circuit and narrows the flow path. .
  • FIG. 2 is a front view of the external trip type earth leakage breaker of FIG. 1 excluding a housing cover of the earth leakage detection trip unit.
  • Fig. 1 shows an external trip type earth leakage breaker.
  • the earth leakage breaker generally includes a plurality (eg, four) of circuit breakers 3 and an earth leakage detection trip unit 4.
  • Each circuit breaker 3 includes a power supply terminal portion 3a and a connection terminal portion 3b.
  • An electric wire 1 is fixed to the power supply terminal portion 3a by a terminal screw 2.
  • the connection terminal portion 3b is an example of a load side terminal portion.
  • the leakage detection trip unit 4 includes a connection terminal portion 7a (see FIG. 3) and load terminal portions 4a (four in this case).
  • An electric wire 1 is fixed to the load terminal portion 4a by a terminal screw 2.
  • the four circuit breakers 3 are connected to each other by a connecting handle 5 as a handle mechanism.
  • the connection handle 5 is connected to the interlock handle 6 of the leakage detection trip unit 4 and shuts off the circuit in conjunction with the operation of the interlock handle 6 when a leak is detected.
  • the interlocking handle 6 is an example of
  • main circuit bars 7 (four in this case) serving as electric circuits are routed inside the leakage detection trip unit 4.
  • the tip of each main circuit bar 7 is welded to the terminal board 8.
  • a zero-phase current transformer (hereinafter referred to as ZCT) 9 is provided as a leakage detection circuit that detects leakage and generates a leakage detection signal.
  • the interlocking handle 6 drives the circuit breaker 3 when the leakage current is detected by the ZCT 9 to perform the circuit breaking operation.
  • connection terminal portion 7a one end side of the main circuit bar 7 is provided as a connection terminal portion 7a, and this connection terminal portion 7a is connected to the connection terminal portion 3b (see FIG. 1) of the circuit breaker 3 with a terminal screw 2. It is fixed. The other end side of the main circuit bar 7 is fixed to the load terminal portion 4 a of the leakage detection trip unit 4 via the terminal plate 8 with the terminal screw 2.
  • the leakage detection trip unit 4 includes a terminal cover 10, a casing body 11, and a casing cover 12, which form a casing of the leakage detection trip unit 4. Yes.
  • the earth leakage detection trip unit 4 includes a heat transfer member 14.
  • the heat transfer member 14 is formed of, for example, a plate material bent into a substantially L shape.
  • the plate material includes a first plate portion and a second plate portion.
  • One end side of the heat transfer member 14 provided as the first plate portion is in contact with the end face 10 a of the terminal cover 10.
  • the connection terminal portion 7 a of the main circuit bar 7 protected by the terminal cover 10 passes through the first plate portion of the heat transfer member 14.
  • the other end side of the heat transfer member 14 provided as the second plate portion is disposed on the side surface of the housing body 11 located on the side close to the mechanical portion 13.
  • the leakage detection trip unit 4 includes an in-casing heat transfer member 15.
  • the in-casing heat transfer member 15 is formed of, for example, a plate material bent into a substantially U shape.
  • the heat transfer members 14 and 15 are opposed to each other with the wall of the housing body 11 interposed therebetween.
  • a substantially ellipse-shaped load terminal portion vent hole 16 is formed on the surface 11a of the housing body 11 provided on the side where the load terminal portion 4a is located. Further, a bottom vent 17 having the same shape as the load terminal vent 16 is also formed on the surface 12a of the housing cover 12 provided on the side where the load terminal 4a is located.
  • the surfaces 11a and 12a are directed to the ground side. Thereby, air whose temperature is lower than that inside the housing can be taken into the housing from the ground side.
  • an upper surface vent 18 having the same shape as the vents 16 and 17 is formed on the surface 11 b opposite to the surface 11 a.
  • the load terminal portion vent 16 and the upper vent 18 are on the same line, and the main circuit bar 7 is arranged on this line.
  • the upper surface vent 18 can discharge the air flowing in from the ground side through the load terminal portion vent 16 and the bottom vent 17 from the inside of the housing to the outside.
  • the leakage detection trip unit 4 has a function of cooling the inside of the housing by ventilation.
  • the main circuit bar 7 is interposed in the flow path from the load terminal portion vent 16 and the bottom vent 17 to the top vent 18.
  • a projection 19 is formed on the inner side of the housing cover 12 from the portion between the interlocking handle 6 and the surface 12 a toward the housing body 11.
  • the protrusion 19 is located between the bottom vent 17 formed on the surface 12a and the ZCT 9.
  • the projection 19 narrows the flow path from the bottom vent 17 to the top vent 18 so that a faster airflow can be applied directly to the main circuit bar 7 than when there is no projection 19.
  • the leakage detection trip unit 4 improves the cooling performance as well as the air permeability inside the housing by the cooperation of the load terminal portion vent 16, the bottom vent 17, the top vent 18, and the protrusion 19.
  • the main circuit bar 7 is easily cooled. Therefore, even when the temperature of the connection terminal portion 7a of the main circuit bar 7 rises, the temperature rise value can be reduced by heat transfer due to ventilation.
  • This embodiment has the following advantages.
  • the channel area becomes narrower and the flow velocity becomes faster than when the protrusion 19 is not provided. For this reason, the main circuit bar 7 is exposed to an airflow having a higher flow velocity. Therefore, the cooling effect of the main circuit bar 7 can be promoted.
  • connection terminal portion 3b of the circuit breaker 3 Since the temperature rise in the vicinity of the connection terminal portion 3b of the circuit breaker 3 is suppressed, it is not necessary to separately attach a cover that covers the connection terminal portion 3b. That is, it is not necessary to provide a dedicated member for lowering the temperature of the housing near the connection terminal portion 3b.
  • the arrangement of the load terminal vent 16, the bottom vent 17, and the top vent 18 is not limited to the above embodiment. However, it is desirable that the airflow flows from the ground in the facing direction when the leakage detection trip unit 4 is installed. Thereby, air whose temperature is lower than that inside the housing can be taken in.
  • the shapes of the load terminal vent 16, the bottom vent 17, and the top vent 18 are not limited to the above embodiment. However, it is desirable that these vents 16 to 18 have a shape that can be easily processed.
  • the shape, position, angle, number, and the like of the protrusions 19 can be arbitrarily set according to the flow velocity or flow rate required for the airflow.

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PCT/JP2014/001309 2013-03-26 2014-03-07 漏電検出引外しユニット WO2014156000A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201480016682.3A CN105122415A (zh) 2013-03-26 2014-03-07 漏电检测解扣单元

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-064330 2013-03-26
JP2013064330A JP6037229B2 (ja) 2013-03-26 2013-03-26 漏電検出引外しユニット

Publications (1)

Publication Number Publication Date
WO2014156000A1 true WO2014156000A1 (ja) 2014-10-02

Family

ID=51623021

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/001309 WO2014156000A1 (ja) 2013-03-26 2014-03-07 漏電検出引外しユニット

Country Status (3)

Country Link
JP (1) JP6037229B2 (zh)
CN (1) CN105122415A (zh)
WO (1) WO2014156000A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114156105A (zh) * 2021-11-16 2022-03-08 扬州鹿洵智能科技有限公司 一种负载浸水的漏电保护开关

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108538684A (zh) * 2017-04-17 2018-09-14 乐清大唐新能源有限公司 一种小型漏电断路器以及重合闸断路器
CN109524277B (zh) * 2018-11-16 2021-06-01 公牛集团股份有限公司 一种连接组件及组合式断路器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04129452U (ja) * 1991-05-20 1992-11-26 三菱電機株式会社 回路遮断器
JP2007242463A (ja) * 2006-03-09 2007-09-20 Nitto Electric Works Ltd 回路遮断器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2513222Y (zh) * 2001-12-25 2002-09-25 陈酌升 组合式漏电保护控制装置
CN101281837B (zh) * 2007-04-05 2011-06-29 浙江正泰电器股份有限公司 模数化剩余电流动作保护器
CN201060828Y (zh) * 2007-06-05 2008-05-14 丁文军 一种漏电断路器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04129452U (ja) * 1991-05-20 1992-11-26 三菱電機株式会社 回路遮断器
JP2007242463A (ja) * 2006-03-09 2007-09-20 Nitto Electric Works Ltd 回路遮断器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114156105A (zh) * 2021-11-16 2022-03-08 扬州鹿洵智能科技有限公司 一种负载浸水的漏电保护开关
CN114156105B (zh) * 2021-11-16 2024-03-08 扬州鹿洵智能科技有限公司 一种负载浸水的漏电保护开关

Also Published As

Publication number Publication date
JP2014191909A (ja) 2014-10-06
JP6037229B2 (ja) 2016-12-07
CN105122415A (zh) 2015-12-02

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