Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
  • H01H33/66—Vacuum switches
  • H01H33/666—Operating arrangements
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H1/00—Contacts
  • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position

Definitions

• the present invention relates to a vacuum circuit breaker, and more particularly to a vacuum circuit breaker provided with a pressure contact spring which provides a contact pressure between movable and fixed contacts.
• vacuum circuit breakers are used in large numbers for substations, distribution facilities, etc. because they can shut off large currents due to their small size.
• the fixed electrode fixed to the end face of the conducting conductor and the movable electrode similarly fixed to the end face of the conducting conductor are faced in the insulating container made of ceramic etc. maintaining the vacuum state.
• This valve body is disposed in the atmosphere or in an insulating gas atmosphere, and is used as a vacuum circuit breaker provided with an operating device for driving and operating the movable electrode in the vicinity of the valve body.
• the actuator used for the vacuum circuit breaker moves the rotation of the rotary shaft linearly through the presence of a lever or the like, and linearly moves the movable electrode to make contact with or separate from the fixed electrode.
• the actuator pulls the movable electrode away from the fixed electrode and performs the blocking operation based on the shutoff command from the control device, and performs the closing operation to bring the movable electrode into contact with the fixed electrode based on the closing command.
• a spring called a pressure contact spring or a wipe spring is provided.
• the pressure contact spring etc. can smoothly shut off and close the movable electrode, apply a predetermined contact pressure at the completion of the closing operation of the movable and fixed electrodes, and insert the movable electrode into the fixed electrode. It is used to prevent chattering that damages the contact surface.
• Patent Document 1 Japanese Patent Laid-Open Publication No. Hei 8-298040
• a pressure contact spring or the like is used for a vacuum circuit breaker.
• a lever for operating the current-carrying conductor of the movable electrode is fixed to the rotary shaft of the actuator, and a cam device is provided at the tip of the lever.
• the contact pressure spring one end of which engages with the cam device, It is arranged on the extension of the conductor.
• the cam device acts on the contact pressure spring to store energy and apply pressing force, and conversely, the open position of the electrode from the closed electrode position When moving to the position of, the pressing force of the contact pressure spring is gradually released.
• a conversion mechanism is connected to the rotation shaft of the operation unit via a lever, and this conversion mechanism The horizontal reciprocating motion is converted into the vertical reciprocating motion to operate the conductive conductor on which the movable electrode is fixed.
• a wipe spring is interposed at the lower end of the insulating operation rod provided on the extension of the current-carrying conductor of the movable electrode, so that the switching operation between the movable and fixed electrodes can be smoothly performed.
• the movable electrode of the conventional vacuum circuit breaker has a stroke characteristic line S 1 as shown in FIG. ing.
• the movable electrode of the conventional vacuum circuit breaker starts the operation from the start time To of operation during the interruption operation (left side in the drawing) to the completion point of interruption operation To 1 and the operation during the closing operation (right side in the drawing) Both from the time point T e to the closing operation completion point T e 1 have stroke characteristics that change linearly at a constant rate.
• the initial separation speed can not be increased by one contact pressure spring, so that the interrupting characteristic can not be improved.
• the insulation performance is further improved by using a pressure spring, and the wear of the contact surface of the movable and fixed electrodes due to chattering is reduced, and the withstand voltage performance between the electrodes It is desirable to improve the shutoff performance and enable long-term use.
• the object of the present invention is to improve the breaking performance by increasing the initial opening speed of the movable electrode, to reduce the wear of the contact surfaces of the movable and fixed electrodes, and to withstand voltage between the electrodes and It is an object of the present invention to provide a vacuum circuit breaker capable of extending the service life as well as improving the interrupting performance. Disclosure of the invention
• a fixed electrode fixed to the tip of the conducting conductor and a movable electrode fixed to the tip of the conducting conductor are disposed in the insulating container maintaining the vacuum state with their contact surfaces facing each other.
• a pulp main body is provided, and a pressing spring is provided on an operating system of the current-carrying conductor of the movable electrode, an auxiliary pressing spring is provided on the operating system, and the auxiliary pressing spring is It is characterized in that it is arranged to start the accumulation of the spring pressure from the middle of the closing operation after the end of the biasing.
• an intermediate connecting rod forming a part of the operation system is engaged with the current-carrying conductor of the movable electrode, and an engagement portion between the current-carrying conductor of the movable electrode and the intermediate connecting rod is the main pressure contact spring.
• the auxiliary pressure contact spring is arranged concentrically.
• the auxiliary pressure welding spring is characterized by using a spring whose spring constant is larger than that of the pressure spring.
• the vacuum circuit breaker is configured using the pressure contact spring and the auxiliary pressure contact spring as in the present invention, even when the movable electrode is separated from the fixed electrode in the case of a breaking operation in which the movable electrode is separated. Since the pressure contact spring continues to expand, the initial opening speed of the movable electrode can be increased, so the interrupting performance can be improved, and the actuator can be manufactured economically since it is not necessary to make the actuator large. In addition, at the time of the closing operation of the movable electrode, the closing speed of the movable electrode can be appropriately reduced by the function of the auxiliary pressure contact spring, so that chattering between the movable and fixed electrodes can be avoided to damage both electrodes. In addition to significantly reducing the voltage between the electrodes and improving the interrupting performance, the service life of the vacuum circuit breaker can be extended. Brief description of the drawings
• FIG. 1 is a schematic longitudinal sectional view showing a partial section of a vacuum tube built-in vacuum circuit breaker according to an embodiment of the present invention.
• FIG. 2 is a schematic vertical cross-sectional view showing the main part of FIG. 1 in an enlarged manner.
• FIGS. 3 (a) to 3 (e) are schematic views sequentially showing the process of the interrupting operation of the electrode in the vacuum circuit breaker of the present invention.
• FIG. 4 (a) Force et al. (E) are schematic views sequentially showing the process of the electrode closing operation of the vacuum circuit breaker of the present invention.
• FIG. 5 is a stroke characteristic diagram of the movable electrode of the vacuum circuit breaker. BEST MODE FOR CARRYING OUT THE INVENTION
• a fixed electrode fixed to the tip of the conducting conductor and a movable electrode fixed to the tip of the conducting conductor are disposed in the insulating container maintaining the vacuum state with their contact surfaces facing each other. Construct the valve body.
• the operating system of the current-carrying conductor of the movable electrode is provided with a pressure-contact spring, and an auxiliary pressure-contacting spring is provided in the operating system. And, it is arranged to start the accumulation of spring pressure in the middle of the closing operation.
• the vacuum circuit breaker shown in Fig. 1 has a ladder-type vacuum circuit breaker structure in which the valve body 10 is housed in the bushing 1 and the terminals 2 and 3 are disposed at the upper and lower end surfaces of the bushing 1 to enclose insulating gas. is there.
• the insulating tube 1 is supported by a hollow support insulator 4 to secure an insulation distance, and the insulation operation rod 5 penetrates the support insulator 4 and is connected to a lever (not shown) of the operation device or the like. , The valve body 10 is operated to open and close.
• the pulp body 10 which is the main part of the vacuum circuit breaker, uses an insulating container 11 which is made of ceramic and maintains the inside in a vacuum state in the same manner as a normal one.
• the fixed electrode 12 is fixed to the end of the conducting conductor 13 fixed to the one end side of the insulating container 1 1 and movable to the tip of the conducting conductor 16 fixed to the bellows 14 provided on the other end side of the insulating container 11.
• the electrodes 15 are fixed, and the contact surfaces of the fixed electrode 12 and the movable electrode 15 are arranged to face each other.
• the current-carrying conductor 16 of the movable electrode 15 is engaged with the current collector 17 which is held by the connection conductor 18.
• an electric circuit can be made to reach terminal 2-conductive conductor 1 3-fixed electrode 1
• 2-movable electrode 1 5-conductive conductor 1 6-current collector 1 7-connection conductor 1 8-terminal 3.
• An intermediate connecting rod 19 which is a part of the operation system is interposed between the conducting conductor 16 surrounded by the connecting conductor 18 and the insulated control port 5. Then, the operating force of the opening of the movable electrode 15 by the operating device is assisted at the connection portion between the end of the current conducting conductor 16 and the intermediate connection rod 19, and between the fixed electrode 12 and the movable electrode 15
• a pressure contact spring 20 for applying a contact pressure is disposed, and an auxiliary pressure contact spring 21 is further disposed.
• the auxiliary pressure contact spring 21 is provided to operate in order to supplement the spring pressure of the pressure contact spring 20 to increase the initial opening speed as described later.
• the above-mentioned structure will be more specifically described with reference to FIG. 2.
• the current-carrying conductor 16 is provided with an engaging portion 16 formed by narrowing a part of the lower end portion.
• the engaging portion 16 A is slidably engaged with the engaging groove 19 A formed at the end of the intermediate connecting rod 19, and the connection is not released by the engaging projection 16 B.
• the pressure contact spring 20 and the auxiliary pressure contact spring 21 which apply contact pressure between the fixed electrode 12 and the movable electrode 15 are disposed concentrically in the engagement portion 16 A. Since the auxiliary pressure contact spring 21 assists the function of the pressure contact spring 20, at least a spring to which pressure can be applied at least as in the pressure contact spring 20, preferably the auxiliary pressure contact spring 21 pressure-contacts this spring constant. Use a spring that is larger than the spring constant of spring 20 so that the desired operation can be performed.
• the auxiliary pressure contact spring 21 shown in FIG. 2 is supported at one end by a spring receiving seat 23 provided at the upper end of the intermediate connecting rod 19 so that the other end can slide on the lower end of the conducting conductor 16 It is configured to be supported by a peristaltic spring seat 24 disposed in
• the peristaltic spring seat 24 is formed on part of the connecting conductor 18 during the closing operation in which the conducting conductor 16 is moved upward to close both electrodes 12 and 15.
• the auxiliary pressure contact spring 21 starts to store the spring pressure. Then, along with the movement of the current-carrying conductor 16 and the intermediate connecting rod 19, the auxiliary pressure contact spring 21 is sufficiently accumulated in the spring pressure, and when the closing operation is completed, The pressure is applied between the electrodes 12 and 15 to increase the contact pressure and to make it available for the next blocking operation.
• a breaking spring (not shown) connected to the lever of the operation unit continues to expand, so that the movable electrode 15 does not move with the pressure spring 20 and the auxiliary pressure spring 21 open. proceed. Finally, as shown in Fig. 3 (e), the movable electrode 15 is completely moved and released, and the blocking operation is completed.
• the pressure contact spring from the start time To of operation in the blocking operation (left side in the figure). Since the spring pressing force of 20 and the auxiliary pressure welding spring 2 1 is added to the operation force of the operation system, the initial opening / closing speed of the movable electrode 15 becomes fast, so the time to the interruption operation completion point To 2 can be shortened. Therefore, the blocking performance is improved.
• both the pressure contact spring 20 and the auxiliary pressure contact spring 2 1 complete the accumulation of spring pressure.
• the movable electrode 15 changes substantially uniformly due to the pressure spring 20 from the start time T e of the movement operation at the closing operation (right side in the figure) to the interval 1, but the auxiliary pressure welding The degree of change changes to the closing operation completion point T e 2 at which the deflection of the spring 21 starts and the amount of deflection d ends. For this reason, since the completion time of the injection is delayed, the injection speed of the movable electrode 15 can be reduced.
• the impact energy of the contact surfaces of both electrodes 12 and 15 can be greatly reduced, and chattering of the contact surfaces can be effectively prevented.
• the impact energy is about half that of the conventional one, which is effective for preventing chattering.
• the vacuum circuit breaker of the present invention has been described as an example used for a ladder-type vacuum circuit breaker, but it is apparent that the present invention can be applied to those housed in air or in a housing.
• the pressure contact spring 20 and the auxiliary pressure contact spring 21 are arranged concentrically at the connection portion between the end of the conductor 16 and the intermediate connection rod 19.
• these locations can be changed as appropriate.
• the pressure spring 20 and the auxiliary pressure spring 21 may be suitably provided in the middle of an operation system having an insulating port, an operating port or an operating mechanism connected to the conductive conductor 16 of the movable electrode 15.
• the locking portion 18 A can be changed in structure and provided at an appropriate place. Industrial applicability
• the vacuum circuit breaker of the present invention can improve the breaking performance by increasing the initial opening speed of the movable electrode, and can be economically manufactured since there is no need to make the operating unit large, and it can be used for power distribution equipment. There is an advantage applicable to each type of vacuum circuit breaker.

Landscapes

• High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=41216961

Family Applications (1)

Country Status (6)

Cited By (2)

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Citations (4)

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• 2008
  • 2008-04-24 JP JP2008113396A patent/JP5297682B2/ja active Active
• 2009
  • 2009-04-21 WO PCT/JP2009/058237 patent/WO2009131238A1/ja not_active Ceased
  • 2009-04-21 KR KR1020107023604A patent/KR101582205B1/ko not_active Expired - Fee Related
  • 2009-04-21 EP EP09735044.1A patent/EP2270827B1/en active Active
  • 2009-04-21 CN CN200980113986.0A patent/CN102017040B/zh not_active Expired - Fee Related
  • 2009-04-21 US US12/989,250 patent/US8426759B2/en active Active

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Non-Patent Citations (1)

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