EP3171373A1 - Dispositif de changement de prise sous charge - Google Patents

Dispositif de changement de prise sous charge Download PDF

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Publication number
EP3171373A1
EP3171373A1 EP15821798.4A EP15821798A EP3171373A1 EP 3171373 A1 EP3171373 A1 EP 3171373A1 EP 15821798 A EP15821798 A EP 15821798A EP 3171373 A1 EP3171373 A1 EP 3171373A1
Authority
EP
European Patent Office
Prior art keywords
current
carrying
change
oil tank
over switch
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP15821798.4A
Other languages
German (de)
English (en)
Other versions
EP3171373A4 (fr
EP3171373B1 (fr
Inventor
Naoki Eguchi
Taku Ishikawa
Yasushi Miyamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Publication of EP3171373A1 publication Critical patent/EP3171373A1/fr
Publication of EP3171373A4 publication Critical patent/EP3171373A4/fr
Application granted granted Critical
Publication of EP3171373B1 publication Critical patent/EP3171373B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01H9/0005—Tap change devices
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • 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
    • H01H9/0005—Tap change devices
    • H01H9/0027—Operating mechanisms
    • 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
    • H01H9/0005—Tap change devices
    • H01H9/0038—Tap change devices making use of vacuum switches
    • 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
    • H01H9/0005—Tap change devices
    • H01H9/0044—Casings; Mountings; Disposition in transformer housing
    • 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
    • H01H9/08—Arrangements to facilitate replacement of a switch, e.g. cartridge housing

Definitions

  • Embodiments of the present disclosure relate to an on-load tap changer that includes a vacuum-valve scheme change-over switch.
  • an on-load tap changer is installed in order to adjust the voltage of a power transmission line or a power distribution line.
  • an on-load tap changer 51 illustrated in FIG. 17 is provided with an on-load tap change unit 52 installed in a transformer main tank 60, and an electric actuation mechanism 53 installed outside the transformer main tank 60.
  • the electric actuation mechanism 53 is to actuate and control the on-load tap change unit 52.
  • the on-load tap change unit 52 is a unit that switches the tap of winding with a load being applied to a transformer in accordance with a voltage fluctuation.
  • the on-load tap change unit 52 is provided with an oil tank 50 filled with an insulation oil 56, and a change-over switch 54 is placed in the oil tank 50.
  • a stationary contact 47 and a stationary-side current-carrying contact 48 are provided on the internal wall surface of the oil tank 50.
  • a tap selecting unit 55 is installed below the oil tank 50. The tap selecting unit 55 is connected to the winding of the transformer.
  • the change-over switch 54 collectively controls the three phases, and switches a carried current while maintaining the operation of the transformer.
  • the change-over switch 54 cuts off and carries the carried current with the main contact in a breaker circuit being exposed to the insulation oil 56 in the oil tank 50.
  • This scheme is called an in-oil arch switching scheme, and for example, a structure illustrated in FIGs. 18-20 is known.
  • the change-over switch 54 is provided with movable contactors 36 at the M1 side, and movable contactors 38 at the M2 side.
  • Each movable contactor 36, 38 is attached to a switch actuation link 37, and the switch actuation link 37 is coupled to a movable contactor actuation lever 43.
  • Those movable contactors 36, 38 are each a so-called rotational arm type movable contact, and performs electrode opening-closing action relative to the stationary contact 47 (see FIG. 17 ) attached to the internal wall surface of the oil tank 50 with a phase difference.
  • the change-over switch 54 is provided with a current-carrying conductor 39 at the M1 side, and a current-carrying conductor 40 at the M2 side in order to reduce the current flowing in a breaker unit.
  • Each current-carrying conductor 39, 40 is attached with a link 41 that supports the current-carrying conductor 39, 40, and the link 41 is coupled to an actuation lever 42.
  • the actuation lever 42 actuates the current-carrying conductor 39, 40, in conjunction with the sequential action of the movable contactor 36, 38.
  • the stationary contact 47 is provided with a stationary contactor 44 at the M1 side and a stationary contactor 54 at the M2 side.
  • the stationary contactor 44 at the M1 side is disposed so as to face the movable contactor 36 (illustrated in FIG. 18 ) at the M1 side and to be in contact with and move apart from the movable contactor 36.
  • the stationary contactor 45 at the M2 side is disposed so as to face the movable contactor 38 (illustrated in FIG. 18 ) at the M2 side and to be in contact with and move apart from the movable contactor 38.
  • the stationary-side current-carrying contact 48 provided on the internal wall surface of the oil tank 50 are neutral current-carrying contacts 30, 32, a tap current-carrying contact 31 at the M1 side, and a tap current-carrying contact 33 at the M2 side.
  • the change-over switch 54 when the current-carrying conductors 39, 40 illustrated in FIG. 18 are actuated, the neutral current-carrying contact 30 and the tap current carrying contact 31 at the M1 side, the neutral current-carrying contact 32 and the tap current carrying contact 33 at the M1 side are alternatively short-circuit, and therefore switches a tap current-carrying.
  • the oil tank 50 includes a cylindrical insulation cylinder 12, and an oil tank bottom 17 fixed to the lower part thereof.
  • the change-over switch 54 (unillustrated in FIG. 20 ) is placed in the insulation cylinder 12.
  • a tap head 10 is installed on the upper part of the oil tank 50, and a deceleration gear mechanism 11 to transmit rotation force to the change-over switch 54 is attached to the head.
  • Attached to the outer circumference surface of the insulation cylinder 12 are, for each phase, a neutral connection terminal 14, a tap connection terminal 15 at the M1 side, and a tap connection terminal 16 at the M2 side, and further a neutral ring 13 that couples the neutral points of the three phases.
  • the neutral connection terminal 14 is disposed below the neutral ring 13, and the tap connection terminals 15, 16 are disposed below the neutral connection terminal 14.
  • the tap connection terminals 15, 16 are disposed side by side in the horizontal direction by a predetermined distance therebetween.
  • the contact wears due to an arc generated in the insulation oil 56.
  • carbon sludge produced together with the arc may contaminate the insulation oil 56 in the oil tank 50.
  • the change-over switch 54 in the in-oil arc switching scheme the maintenance and inspection work, and the filtering work of the insulation oil 56 are essential, resulting in an increase in costs.
  • a vacuum-valve scheme change-over switch that employs a breaker unit that is a vacuum valve is getting attention.
  • the main contact is sealed in the vacuum valve in a high vacuum state, and a current is broken by opening and closing the vacuum valve.
  • excellent dielectric strength and arc-extinguishing performance are achieved.
  • the vacuum-valve scheme a large number of vacuum valves are disposed, and the opening closing mechanisms thereof are necessary.
  • the layout of the components disposed in the oil tank is largely different from that of the in-oil arc switching scheme.
  • the oil tank 50 is directly installed in the transformer main tank 60, it is difficult to detach the oil tank 50 from the transformer main tank 60.
  • the service life of the oil tank 50 is designed to be substantially consistent with that of the transformer main tank 60. Accordingly, there is a desire to interchange the change-over switch 54 from the in-oil arc switching scheme to the vacuum-valve scheme but use the oil tank 50 for a long time with the transformer main tank 60 without a replacement and a modification.
  • actuation mechanisms such as a mechanism to open and close the vacuum valve, and a mechanism that actuates the current-carrying conductor in conjunction therewith.
  • An example and typical actuation mechanism is a toggle ring having a complex structure.
  • Embodiments of the present disclosure have been proposed to address the aforementioned technical problems, and an objective is to provide an on-load tap changer which ensures the compatibility of an oil tank when an interchange from the in-oil arc switching scheme to the vacuum-valve scheme is made, enhancing a retrofit function, achieving a space saving by simplifying components, and facilitating a construction of an actuation mechanism.
  • an on-load tap changer includes an oil tank filled with an insulation oil, and a vacuum-valve scheme change-over switch placed in the oil tank, the change-over switch includes a main contact contained a vacuum valve, and a current-carrying conductor reducing a current flowing in the main contact.
  • This on-load tap changer includes the following features.
  • a first embodiment will be explained in detail with reference to FIGs. 1-16 .
  • an improvement is made to the change-over switch of an on-load tap changer, and the same component as that of the conventional on-load tap changer illustrated in FIG. 17 will be denoted by the same reference numeral, and the explanation thereof will be omitted.
  • a change-over switch 46 employs the vacuum-valve scheme, and a stationary-side current-carrying contact 48 is attached to the internal wall surface of an oil tank 50.
  • the oil tank 50 and the stationary-side current-carrying contact 48 employ the same structures as those of the conventional in-oil arc switching scheme illustrated in FIG. 19 , 20 . That is, the stationary-side current-carrying contact 48 includes neutral current-carrying contacts 30, 32, a tap current-carrying contact 31 at the M1 side, and a tap current-carrying contact 33 at the M2 side, as illustrated in FIG. 19 .
  • a feature such that the change-over switch 46 is freely attachable to and detachable from the oil tank 50 while the stationary-side current-carrying contact 48 being attached to the oil tank 50 is employed.
  • the change-over switch 46 is to be detached from the oil tank 50, or when the change-over switch 46 is to be attached to the oil tank 50, no component is provided at the location that disturbs the attachment and detachment work of the change-over switch 46 at both the oil-tank-50 side and the change-over-switch-46 side.
  • a ground shield 18 is installed on the upper part of the change-over switch 46, and an accumulating mechanism 19 is attached just below.
  • a breaker unit 49 is built in the lower part of the accumulating mechanism 19. Provided on the outer circumference of the breaker unit 49 are a slide neutral contact 20, a slide M1 contact 21, and a slide M2 contact 22.
  • the slide neutral contact 20, the slide M1 contact 21, and the slide M2 contact 22 are abutting to a neutral connection terminal 14, tap connection terminals 15, 16 (located outside the oil tank 50) explained in reference to FIG. 20 , and are contacts that draw a current into the change-over switch 46.
  • a current limiting resistor 23 and a varistor 24 are provided at the lower part of each contact 20-22. The varistor 24 is to protect a part between current-breaking electrodes of the change-over switch 54 when an abnormal surge voltage is applied between taps.
  • the breaker unit 49 of the change-over switch 46 will be explained with reference to FIG. 3 .
  • vacuum valves that are an M1-side main valve 2, an M2-side main valve 3, an M1-side resistance valve 5, and an M2-side resistance valve 6 are provided. All of the vacuum valves are formed of cylindrical components, and are installed in such way that the lengthwise direction of the cylindrical component is in parallel with the axial-line direction of the breaker unit 49.
  • the breaker unit 49 is provided with three phases that are the U-phase, the V-phase, and the W-phase, and the four vacuum valves per each phase, that is, a total of 12 vacuum valves in the three phases are attached to breaker holders 4.
  • the breaker holder 4 is provided at the middle part of the breaker unit 49, and is provided for each phase respectively.
  • An opening-closing mechanism for the vacuum valves including the four vacuum valves, and a parallel link mechanism that actuates current-carrying conductors 7, 8 in a parallel manner are attached to the breaker holder 4.
  • the current-carrying conductor 7 at the M1 side and the current-carrying conductor 8 at the M2 side are provided adjacent to the M1-side resistance valve 5, and the M2-side resistance valve 6, respectively.
  • the current-carrying conductors 7, 8 close electrodes to carry the current after the tap change, thereby suppressing a deterioration of the current-breaking performance in the breaker unit 49 to enhance the durability performance, and contributing to the downsizing and the simplification of the change-over switch 46.
  • a resistance switch holder 9 is provided below the resistance valves 5, 6.
  • the resistance switch holder 9 is built with a switch mechanism (unillustrated) that ensures the insulation of the non-current-carrying tap.
  • a change crank 1 is provided at the upper part of the breaker unit 49.
  • the change crank 1 is coupled to the opening-closing mechanism for the vacuum valve, the parallel link mechanism that actuates the current-carrying conductor 7, 8 in the parallel manner, and the switch mechanism that ensures the insulation of the non-current-carrying tap. Those mechanisms are actuated by the rotation of the change crank 1.
  • the parallel link mechanism is a current-carrying contact mechanism that actuates the current-carrying conductor 7, 8, moves in and out the current-carrying conductor 7, 8 in the radial direction of the change-over switch 46 upon receiving rotation forces from current-carrying cams 26, 29, causes M1, M2 taps in the stationary-side current-carrying contact 48 to be alternately short-circuited, thereby switching the current-carrying.
  • the current-carrying cam 26 is a component that actuates the parallel link mechanism, and is a cam component in a disk shape provided to be freely rotatable around the center axis of the change-over switch 46. As illustrated in FIGs. 3 , 4 , the current-carrying cam 26 is disposed to engage with the respective upper parts of the current-carrying conductors 7, 8. In addition, as illustrated in FIG. 4 , the current-carrying cam 29 is disposed to engage with the respective lower parts of the current-carrying conductors 7, 8.
  • the parallel link mechanism is provided with a pair of current-carrying links 27, and one end of the current-carrying links 27 rotatably support the current-carrying conductors 7, 8 via coupling shafts 7b, 8b.
  • a current-carrying link support pin 28 is attached to the other end of the current-carrying link 27.
  • the current-carrying link support pin 28 is a component elongated in the axial-line direction of the breaker unit 49.
  • the end of the current-carrying link support pin 28 is rotatably supported by a current-carrying link support hole 25 (shown in FIG. 5 ) formed in the breaker holder 4.
  • the stationary-side current-carrying contact 48 that includes the neutral current-carrying contacts 30, 32, and the tap current-carrying contacts 31, 33 at the M1 side and M2 side respectively.
  • Those current-carrying contacts 30-33 will be explained with reference to FIGs. 6-8 .
  • the tap current-carrying contact 31 at the M1 side is disposed under the neutral current-carrying contact 30, and the tap current-carrying contact 33 at the M2 side is disposed under the neutral current-carrying contact 32.
  • actuation rollers 7a, 8a are provided to respective upper end and lower end of the current-carrying conductors 7, 8 in free rotatable manner, and the upper current-carrying cam 26 and the lower current-carrying cam 29 are installed to sandwich the actuation rollers 7a, 8a from above and below.
  • Cam grooves 26a, 29a are formed in the current-carrying cams 26, 29, respectively, and are engaged with the actuation rollers 7a, 8a.
  • the parallel link mechanisms in this embodiment are disposed at both ends of a divided region per a phase. That is, as illustrated in FIG. 8 , the three phases (U-phase, V-phase, and W-phase) are similarly provided at a dividing angle of 120 degrees, and the parallel link mechanisms are supported by the respective current-carrying link support holes 25 (see FIG. 5 ) formed in the breaker holders 4 at both ends of the respective divided regions for the three phases, and are disposed in a mirror-image manner. In addition, as illustrated in FIG. 8 , the resistance valves 5, 6 at the M1 and M2 sides are disposed between the link mechanisms.
  • FIG. 9A the M1 side closes to form a current-carrying electrode closing unit 34 at the M1 side, while at the same time, the M2 side opens to form a current-carrying electrode opening unit 35 at the M2 side. This state corresponds to FIG. 10 .
  • FIG. 9A the M1 side closes to form a current-carrying electrode closing unit 34 at the M1 side, while at the same time, the M2 side opens to form a current-carrying electrode opening unit 35 at the M2 side.
  • FIG. 10 the M1 side closes to form a current-carrying electrode closing unit 34 at the M1 side.
  • the current-carrying conductor 7 at the M1 side becomes a current-carrying ON state while the current-carrying conductor 8 at the M2 side becomes a current-carrying OFF state, and it will be at the current-carrying position of M1.
  • both M1 and M2 become the electrode opening state. That is, the current-carrying electrode closing unit 34 at the M1 side now becomes a current-carrying electrode opening unit 36, and the current-carrying electrode opening unit 35 at the M2 side remains unchanged.
  • This state corresponds to FIGs. 11-13 . That is, a switching action that causes the current-carrying conductor 7 at the M1 side to be retracted is performed, and in FIGs. 11 , 12 , both M1 and M2 sides are in the current-carrying OFF state.
  • the current-carrying conductor 8 at the M2 side starts moving so as to move outwardly from the center direction relative to the radial direction of the change-over switch 46.
  • the M1 side becomes the electrode opening state
  • the M2 side becomes the electrode closing state
  • the current-carrying electrode opening unit 36 at the M1 side remains unchanged while the M2 side now becomes a current-carrying electrode closing unit 37, and the tap switching action completes.
  • This state corresponds to FIG. 14 .
  • the current-carrying conductor 7 at the M1 side becomes the current-carrying OFF state while the current-carrying conductor 8 at the M2 side becomes the current-carrying ON state, and it will be at the current-carrying position of M2.
  • FIGs. 15A-15C each illustrate a circuit diagram of the breaker unit 49 in this embodiment.
  • FIGs. 9A-9C correspond to FIGs. 15A-15C , respectively.
  • the M1 side of the parallel link mechanism that is the contact current-carrying mechanism is indicated as B so
  • the M2 side is indicated as B se .
  • Reference signs 34-37 in FIGs. 15A-15C are the same as those of FIGs. 9A-9C , and 34, 35, 36, and 37 indicate the current-carrying electrode closing unit at the M1 side, the current-carrying electrode opening unit the M2 side, the current-carrying electrode opening unit at the M1 side, and the current-carrying electrode closing unit at the M2 side, respectively.
  • FIG. 16 illustrates an exemplary switching sequence of the breaker unit 49 in this embodiment.
  • the switching angle range is set to 0-75 degrees
  • the M1 side closes the electrode at 0-10 degrees, and opens the electrode at 10-75 degrees.
  • the M2 side is set to open the electrode at 0-65 degrees, and to close the electrode at 65-75 degrees.
  • Reference signs 34, 35 in FIG. 16 are the same as those of FIGs. 9A-9C , and 34, 35 indicate the current-carrying electrode closing unit at the M1 side, and the current-carrying electrode opening unit at the M2 side, respectively.
  • the first embodiment as explained above achieves the following actions and effects.
  • the oil tank may be provided with an opening that enables the entire change-over switch to be taken out, and a lid to close this opening may be provided in a manner slidable in the horizontal direction. According to such embodiment, even if the deceleration gear mechanism, etc., is provided near the opening, by sliding and opening the lid so as not to collide such mechanism, a take-out work of the change-over switch from the oil tank is made efficient.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Gas-Insulated Switchgears (AREA)
EP15821798.4A 2014-07-15 2015-06-30 Dispositif de changement de prise sous charge Active EP3171373B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014145430A JP6282547B2 (ja) 2014-07-15 2014-07-15 負荷時タップ切換装置
PCT/JP2015/068802 WO2016009825A1 (fr) 2014-07-15 2015-06-30 Dispositif de changement de prise sous charge

Publications (3)

Publication Number Publication Date
EP3171373A1 true EP3171373A1 (fr) 2017-05-24
EP3171373A4 EP3171373A4 (fr) 2018-04-11
EP3171373B1 EP3171373B1 (fr) 2019-08-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15821798.4A Active EP3171373B1 (fr) 2014-07-15 2015-06-30 Dispositif de changement de prise sous charge

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EP (1) EP3171373B1 (fr)
JP (1) JP6282547B2 (fr)
WO (1) WO2016009825A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022148583A1 (fr) * 2021-01-07 2022-07-14 Maschinenfabrik Reinhausen Gmbh Module de commutation et changeur de prises en charge comprenant un module de commutation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110085459A (zh) * 2018-12-12 2019-08-02 浙江腾龙电器有限公司 一种新型有载调容分接开关

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Publication number Priority date Publication date Assignee Title
JPS58222506A (ja) * 1982-06-18 1983-12-24 Hitachi Ltd 負荷時タツプ切換器
JPS6091608A (ja) * 1983-10-26 1985-05-23 Toshiba Corp １タツプ式負荷時タツプ切換器
ES2715046T3 (es) * 2006-08-23 2019-05-31 Abb Schweiz Ag Conmutador de desviación basado en vacío para cambiador de la relación de transformación
DE102010020180A1 (de) * 2010-05-11 2011-11-17 Maschinenfabrik Reinhausen Gmbh Lastumschalter für einen Stufenschalter
JP2012238653A (ja) * 2011-05-10 2012-12-06 Toshiba Corp 切換開閉器およびこれを用いたタップ切換装置
JP5709641B2 (ja) * 2011-05-11 2015-04-30 株式会社東光高岳 タップ切換装置及び柱上変圧器
JP6081082B2 (ja) * 2012-05-18 2017-02-15 株式会社東芝 負荷時タップ切換装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022148583A1 (fr) * 2021-01-07 2022-07-14 Maschinenfabrik Reinhausen Gmbh Module de commutation et changeur de prises en charge comprenant un module de commutation

Also Published As

Publication number Publication date
JP2016021533A (ja) 2016-02-04
WO2016009825A1 (fr) 2016-01-21
EP3171373A4 (fr) 2018-04-11
EP3171373B1 (fr) 2019-08-21
JP6282547B2 (ja) 2018-02-21

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