WO2005081377A1 - Appareil declencheur de fuite electrique pour defaut de mise a la masse - Google Patents

Appareil declencheur de fuite electrique pour defaut de mise a la masse Download PDF

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Publication number
WO2005081377A1
WO2005081377A1 PCT/CN2004/000133 CN2004000133W WO2005081377A1 WO 2005081377 A1 WO2005081377 A1 WO 2005081377A1 CN 2004000133 W CN2004000133 W CN 2004000133W WO 2005081377 A1 WO2005081377 A1 WO 2005081377A1
Authority
WO
WIPO (PCT)
Prior art keywords
disconnect switch
load
switch
leakage
main
Prior art date
Application number
PCT/CN2004/000133
Other languages
English (en)
Chinese (zh)
Inventor
Wai Chan
Original Assignee
Hong Kong Productivity Council
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 Hong Kong Productivity Council filed Critical Hong Kong Productivity Council
Priority to PCT/CN2004/000133 priority Critical patent/WO2005081377A1/fr
Priority to CNB2004800084069A priority patent/CN100452597C/zh
Publication of WO2005081377A1 publication Critical patent/WO2005081377A1/fr

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Classifications

    • 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

Definitions

  • the invention relates to a leakage protection device when a ground loop fails, and in particular to a leakage protection device capable of quickly disconnecting a power supply and a load. Background technique
  • a ground fault leakage protection device is a safety device installed to protect personnel's lives installed between the power supply and the load. Its function is to prevent the ground circuit of the load from failing or there is no ground circuit. At the same time when a leakage occurs, once the human body contacts the leakage body, Cut off the power circuit to protect life.
  • earth-fault leakage protection devices basically consist of a main disconnect switch, a zero-sequence current transformer, a leakage signal amplifier, a relay that controls the operation of the main disconnect switch, and an actuator.
  • the working principle is that when the reset button is pressed, if the load end is normal, the main disconnect switch of the protection device is turned on, and the zero-sequence current transformer, leakage signal amplification circuit, relay and load are all powered into the working state. There is no leakage current in the zero-sequence current transformer, the control circuit supplies power to the relay, the relay pulls in the main disconnect switch, and the load works normally.
  • the zero-sequence current transformer gives a signal
  • the leakage signal amplification circuit amplifies this signal and de-energizes the relay, and the actuator opens the main circuit.
  • the switch is turned off to cut off the power supply.
  • a complete ground fault leakage protection device also needs to have the function that the main disconnect switch does not give a closing action even when the reset button is pressed when a load leakage fault exists.
  • the technical requirement for this type of earth-fault leakage protection device is that the disconnection speed should be as fast as possible when the leakage occurs.
  • the main action is to unlock the main disconnect switch before opening That is to say, the entire cutting process is completed by two mechanical actions, and the disconnection time is undoubtedly relatively long.
  • the pull-in force of the relay is used to overcome the opening and closing force of the main disconnect switch to achieve the purpose of closing the main disconnect switch.
  • the principle is that when the relay is de-energized, disconnecting the restoring force causes the main disconnect switch to open.
  • the breaking and restoring force is limited by the magnetic field strength of the cutting stroke distance, that is, the relay must rely on the electromagnetic force of the electromagnet to cause the main disconnect switch action beyond a certain distance to overcome the breaking and restoring force.
  • the existing technology only controls the disconnection of the power supply side and does not control the disconnection of the load side.
  • the disadvantage of this leakage protection method is that when there is a leakage fault at the load end, and someone is touching the leakage body. In this case, once others press and hold the reset button for a long time, the malfunction will be aggravated and the electric shock will be more dangerous.
  • the main object of the present invention is to provide a relay-type power-off device with manual assistance for resetting.
  • the device is used on a ground-circuit failure leakage circuit breaker or an arc failure circuit breaker, thereby obtaining a shorter disconnection time and simultaneously Keep compact and simple design;
  • Another object of the present invention is to provide a ground loop failure leakage protection device that is still safe when someone accidentally resets the leakage fault at the load end before it is eliminated;
  • Another object of the present invention is to provide a ground loop failure leakage protection device including a simple mechanical action mechanism, thereby reducing the risk of failure due to the characteristics of a mechanical lock;
  • the present invention provides a technical solution of a ground loop failure leakage protection device, which includes a main circuit breaker for turning on and off the power supply, a zero-sequence current transformer, which is used when the protected circuit fails.
  • Generate a leakage signal that is, a leakage induced current signal is given when a phenomenon such as leakage, short circuit, or electric shock occurs in the load circuit.
  • a leakage signal amplifier that receives the leakage signal and amplifies it, amplifies the received leakage induction current signal enough to drive the relay, de-energizes the relay, and thus loses its closing constraint on the main disconnect switch.
  • the actuator of the leakage protection device has the following structural characteristics: a main disconnect switch controls the spring, its restoring force is used to cancel the closing constraint on the main disconnect switch, a load disconnect switch and its control spring, and the load disconnect switch controls the restoring force of the spring
  • a travel block fixed integrally with the reset button.
  • the travel block has a restricting part that can unidirectionally restrain the main disconnect switch and a restricting part that can unidirectionally restrain the load disconnect switch.
  • the travel block is at two limits. Alternatively, one of the circuit breakers is closed and closed.
  • a strong spring is placed between the foundation and the travel block. The strong spring restoring force is used to release the moving block from closing the main circuit breaker.
  • FIG. 1 is a diagram illustrating the working principle of the actuator of the present invention
  • Fig. 3 is a sectional view taken along A-A of Fig. 2;
  • Fig. 4 is a sectional view taken along the line B-B of Fig. 3;
  • FIG. 5 is a view taken in the direction of the arrow C in FIG. 3. detailed description
  • control circuit 1 for short, and are represented by a block diagram. It is connected to the control circuit 1, the other end of the control circuit 1 is connected to the load 5 through the load disconnect switch 4, and the output end of the control circuit 1 is connected to the coil 65 of the relay 4.
  • the two armature 61 and 64 of the relay 6 are connected to the main disconnect switch 3 and the load disconnect switch 4, respectively.
  • the actuator mainly includes a main disconnect switch control spring 62 and a load disconnect switch control spring 63.
  • the actuator also has a stroke block 7, which is fixed on the foundation by a rotating hinge 75, which can reciprocate around the hinge 75 at two extreme positions. At one extreme position, one end 71 restrains the main circuit breaker. The switch 3 closes it, and the other end 74 is released from the closing restriction on the load disconnect switch 4; at the other extreme position, the opposite end, the one end 74 applies the closing restriction on the load disconnect switch 4, and the other end 71 is released from the main disconnect switch. Closed constraint of 3. There is also a reset button 72 and a strong spring 73 at the near end 71. When the reset button 72 is pressed downwards as shown in FIG.
  • the restoring force of the strong spring 73 can be overcome to make the stroke block 7 reach the position where the main disconnect switch 3 is closed.
  • the travel block 7 In the extreme position, release the reset button 72, and the travel block 7 reaches the other extreme position that closes the load disconnect switch 4 under the force of the restoring force of the strong spring 73. That is, the travel block 7 can alternatively be in two positions. The movement between the extreme positions, closes one of the thresholds.
  • the control circuit 1 will supply power to the coil 65 of the relay 6, and the armature 61 is closed to keep the main disconnect switch 3 closed after the human is removed.
  • the armature 64 is powered by a strong spring 73 and the armature electromagnetic force.
  • the load disconnect switch 4 is brought into a closed state, and the load 5 is brought into a powered state. If there is no leakage at the load end and the phenomenon of conducting the ground loop exists, the load will remain powered.
  • the control circuit 1 When there is a leakage at the load end and the grounding loop conduction phenomenon occurs, the control circuit 1 will quickly de-energize the coil 6 of relay 6 and the main disconnect switch 3 will immediately open under the extension of the control spring 62 to cut off the power supply 2.
  • the coil 65 can be one or two groups of independent coils.
  • the control circuit 1 When an electric shock or leakage at the load end is not ruled out and someone presses the reset button 72, the control circuit 1 will quickly get a signal and quickly make the relay 6 The coil 65 loses power. Even if the reset button 72 is not released, the load disconnect switch 4 will cause the open state under the extension of the control spring 63 to effectively protect the safety of the electric shocked person or equipment.
  • FIG. 2 this is a structural front view of a leakage protection device product.
  • the entire device is arranged in a box body 8.
  • One panel of the box body 8 has a power input socket 9 and a load output socket 10 (the virtual Line).
  • the circuit board of the control circuit 1 is fixed in the box body 8, and the base of the actuator is fixed in the box body 8.
  • the test button 11 and the reset button 72 pass out of the box panel 8a.
  • the main body of the travel block 7 of this example is a straight rod, which has a convex portion 14 on the right side and another convex portion 14a on the left end, which moves linearly with respect to the box body 8 as a base, and the test button is not moved with a relatively basic base.
  • the fixed plate 15 is connected, and the main disconnect switch 3 and the load disconnect switch 4 can rotate around the shaft 12.
  • the strong spring 73, the main disconnect switch control spring 62, and the load disconnect switch control spring 63 are sleeved on the travel block 7. Among them, the load is disconnected.
  • the switch control spring 63 is placed between a relatively basic spring support plate 13 and the load disconnect switch 4 (armature 64).
  • the main disconnect switch control spring 62 is placed between the spring support plate 13 and the main disconnect switch 3 (armature 61). In between, a strong spring 73 is placed between the base and the stroke block 7.
  • relay 6 When relay 6 operates, electromagnetic The iron core 65a will attract the armature 61 and 64 when the relay is energized.
  • the mass of the armature 64 should be appropriately reduced to prevent the electromagnetic attraction force from exceeding the extension tension of the control spring 63.
  • the travel block ⁇ has two convex portions 14 and 14a which can be alternatively provided to the main disconnect switch 3 and the load disconnect switch 4 to be turned on and closed.
  • this figure reflects the structural form of the shaft 12 and the main disconnect switch 3, the load disconnect switch 4.
  • the invention can be used for all electrical appliances and indoor and outdoor power supply facilities, as a disconnection device that protects human life when the ground loop fails and when there is a leakage, and at the same time, it reduces the risk of fire caused by electric arcs in the circuit to a greater extent.
  • the disconnection of the power supply is not only simplified into one, but also the resetting force of the main disconnect switch control spring is overcome by manually touching the reset button. Therefore, the restoring force of the control spring can be selected to be relatively low.
  • the existing technology is much larger, the disconnection speed is extremely fast, and the physical property disconnection on the circuit is realized; at the same time, incorrect operation can also effectively protect people or load equipment when the fault is not eliminated.
  • the present invention will provide safer protection to electrical appliance users and the use environment where there are flammable materials.
  • the entire device also has the advantages of simple structure, high reliability, and easy processing.

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Abstract

Un appareil déclencheur de fuite électrique pour défaut de mise à la masse composé d'un commutateur principal, d'un commutateur de charge, d'un transformateur de courant séquence zéro et d'un circuit de commande dans lequel l'amplificateur signal-fuite est contenu. Le mécanisme de l'appareil déclencheur de fuite présente les caractéristiques suivantes: un ressort de commande du commutateur principal sert à rétracter la rétention sur le commutateur principal, un ressort de commande du commutateur de charge sert à ouvrir le commutateur de charge, un bloc de défilement est fixé à un bouton de remise à zéro, un ressort vient entre une base et le bloc de défilement sert à rétracter la rétention sur le commutateur principal appliquée par le bloc de défilement. Ce bloc comporte des éléments de restriction pour restreindre unilatéralement le commutateur principal et le commutateur de charge respectivement. Le bloc de défilement sélectionne une position supérieure et restreint la fermeture du commutateur. Dans le cas d'une fuite électrique ou d'un défaut de mise à la masse, l'appareil peut s'interrompre rapidement et assurer une protection fiable à l'utilisateur et l'appareil de charge même si la panne persiste.
PCT/CN2004/000133 2004-02-19 2004-02-19 Appareil declencheur de fuite electrique pour defaut de mise a la masse WO2005081377A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2004/000133 WO2005081377A1 (fr) 2004-02-19 2004-02-19 Appareil declencheur de fuite electrique pour defaut de mise a la masse
CNB2004800084069A CN100452597C (zh) 2004-02-19 2004-02-19 接地失效漏电保护装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2004/000133 WO2005081377A1 (fr) 2004-02-19 2004-02-19 Appareil declencheur de fuite electrique pour defaut de mise a la masse

Publications (1)

Publication Number Publication Date
WO2005081377A1 true WO2005081377A1 (fr) 2005-09-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2004/000133 WO2005081377A1 (fr) 2004-02-19 2004-02-19 Appareil declencheur de fuite electrique pour defaut de mise a la masse

Country Status (2)

Country Link
CN (1) CN100452597C (fr)
WO (1) WO2005081377A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113258541A (zh) * 2021-06-28 2021-08-13 西安中熔电气股份有限公司 一种控制电路由常开切换常闭的激励保护装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3422720A1 (de) * 1984-06-19 1985-12-19 Siemens AG, 1000 Berlin und 8000 München Strombegrenzender schalter
US4814738A (en) * 1986-10-02 1989-03-21 Ellenberger & Poensgen Gmbh Overload protection switch
US5332986A (en) * 1993-04-13 1994-07-26 Allen-Bradley Company, Inc. Overload relay mechanism
CN1407577A (zh) * 2001-08-28 2003-04-02 德丰实业有限公司 断路器
US6580344B2 (en) * 2000-09-04 2003-06-17 Huadao Huang Ground fault interruption receptacle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07282712A (ja) * 1994-04-08 1995-10-27 Kawamura Denki Sangyo Kk 漏電遮断器
US6788173B2 (en) * 2002-05-01 2004-09-07 Leviton Manufacturing Co., Inc. Reset lockout and trip for circuit interrupting device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3422720A1 (de) * 1984-06-19 1985-12-19 Siemens AG, 1000 Berlin und 8000 München Strombegrenzender schalter
US4814738A (en) * 1986-10-02 1989-03-21 Ellenberger & Poensgen Gmbh Overload protection switch
US5332986A (en) * 1993-04-13 1994-07-26 Allen-Bradley Company, Inc. Overload relay mechanism
US6580344B2 (en) * 2000-09-04 2003-06-17 Huadao Huang Ground fault interruption receptacle
CN1407577A (zh) * 2001-08-28 2003-04-02 德丰实业有限公司 断路器

Also Published As

Publication number Publication date
CN1768461A (zh) 2006-05-03
CN100452597C (zh) 2009-01-14

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