WO2016009825A1

WO2016009825A1 - On-load tap changing device

Info

Publication number: WO2016009825A1
Application number: PCT/JP2015/068802
Authority: WO
Inventors: 江口　直紀; 拓石川; 泰志宮本
Original assignee: 株式会社東芝
Priority date: 2014-07-15
Filing date: 2015-06-30
Publication date: 2016-01-21
Also published as: JP2016021533A; EP3171373A4; EP3171373B1; JP6282547B2; EP3171373A1

Abstract

Provided is an on-load tap changing device with which retrofit functionality can be increased while maintaining compatibility of the oil tank when changing from an in-oil arc changing method to a vacuum valve method, and with which the configuration of the components can be simplified, thereby improving the space-saving characteristic and enabling a drive mechanism to be easily constructed. A vacuum valve type tap switch (46) is housed inside an oil tank (50) filled with insulating oil (56). The tap switch (46) is provided with vacuum valves (2, 3, 5, and 6) that house primary contacts, and current-carrying conductors (7, 8) that reduce the current flowing in the primary contacts, and the tap switch is equipped with a parallel link mechanism that moves the current-carrying conductors (7, 8) in a parallel manner. Fixed contacts (47) capable of contacting and separating from the current-carrying conductors (7, 8) are attached to the inner wall surface of the oil tank (50). The configuration is such that the tap switch (46) can be attached to and removed from the oil tank (50) while the fixed contacts (47) are attached to the oil tank (50).

Description

Load tap changer

Embodiment of this invention is related with the tap switching apparatus at the time of loading provided with the switching switch of the vacuum valve system.

Generally, an on-load tap switching device is provided to adjust the voltage of the transmission line or distribution line. For example, the on-load tap switching device 51 shown in FIG. 17 is provided with an on-load tap switching device 52 installed in the transformer tank 60 and an electric operation mechanism 53 installed outside the transformer tank 60. Yes.

Among these, the electric operation mechanism 53 is for driving and controlling the on-load tap changer 52. The on-load tap changer 52 is a device that switches the taps of the windings in a state where a transformer load is applied in accordance with voltage fluctuations. The on-load tap changer 52 is provided with an oil tank 50 filled with insulating oil 56, and a switching switch 54 is accommodated in the oil tank 50. A fixed contact 47 and a fixed-side energization contact 48 are provided on the inner wall surface of the oil tank 50. A tap selector 55 is installed at the lower part of the oil tank 50. The tap selector 55 is connected to the transformer winding.

The switching switch 54 controls the three phases at once and switches the energizing current while continuing the operation of the transformer. The switching switch 54 cuts off the energization current and energizes the main contact in the interruption circuit with the insulating oil 56 in the oil tank 50 exposed. This method is called an arc-in-oil switching method, and for example, configurations shown in FIGS. 18 to 20 are known.

As shown in FIG. 18, the switching switch 54 is provided with a movable contact 36 on the M1 side and a movable contact 38 on the M2 side. Each

movable contact

36, 38 is attached to a switching movable link 37, and the switching movable link 37 is connected to a movable contact driving lever 43. These

movable contacts

36 and 38 are so-called rotary arm type movable contacts, and perform a switching pole operation with a fixed contact 47 (shown in FIG. 17) attached to the inner wall surface of the oil tank 50 with a phase difference. Yes.

Further, the switching switch 54 is provided with a current-carrying conductor 39 on the M1 side and a current-carrying conductor 40 on the M2 side in order to reduce the current flowing in the interrupting portion. A link 41 for supporting the current-carrying

conductors

39, 40 is attached to each current-carrying

conductor

39, 40, and a drive lever 42 is connected to the link 41. The drive lever 42 drives the current-carrying

conductors

39 and 40 in conjunction with a series of movements of the

movable contacts

36 and 38.

The configuration of the fixed contact 47 on the oil tank 50 side and the fixed-side energizing contact 48 will be described with reference to FIG. As shown in FIG. 19, the fixed contact 47 is provided with a fixed contact 44 on the M1 side and a fixed contact 45 on the M2 side. The fixed contact 44 on the M1 side is arranged so as to face and separate from the movable contact 36 on the M1 side (shown in FIG. 18). The fixed contact 45 on the M2 side is disposed so as to face and separate from the movable contact 38 on the M2 side (shown in FIG. 18).

Further, as the fixed side energizing contact 48, neutral

point energizing contacts

30 and 32, M1 side tap energizing contact 31 and M2 side tap energizing contact 33 are provided on the inner wall surface of the oil tank 50. In the switching switch 54, when the current-carrying

conductors

39 and 40 shown in FIG. Are alternately short-circuited, thereby switching the tap energization.

19 shows the members attached to the inner wall surface of the oil tank 50. Next, the appearance of the oil tank 50 will be described with reference to FIG. As shown in FIG. 20, the oil tank 50 is composed of a cylindrical insulating cylinder 12 and an oil tank bottom 17 fixed to the lower part thereof, and a switching switch 54 (not shown in FIG. 20) is provided inside the insulating cylinder 12. (Shown) is stored. A tap tow 10 is installed in the upper part of the oil tank 50, and a deceleration Haguru mechanism 11 for transmitting a rotational force to the switching switch 54 is attached thereto.

A neutral point connection terminal 14, an M1 side tap connection terminal 15, and an M2 side tap connection terminal 16 are attached to the outer peripheral surface of the insulating cylinder 12 for each phase. A neutral ring 13 is provided for connection. The neutral point connection terminal 14 is disposed below the neutral ring 13, and the

tap connection terminals

15 and 16 are disposed below the neutral point connection terminal 14. The

tap connection terminals

15 and 16 are arranged in a horizontal direction with a predetermined distance.

In the switching switch 54 of the arc-in-oil switching system as described above, the contact wear is caused by the arc generated in the insulating oil 56. Moreover, the carbon sludge generated with the arc may contaminate the insulating oil 56 in the oil tank 50. Therefore, in the switching switch 54 of the arc-in-oil switching system, maintenance inspection work and filtration work of the insulating oil 56 are indispensable, and the work cost is increased.

Therefore, instead of the arc-in-oil switching method, a vacuum valve type switching switch that uses a vacuum valve in the shut-off part has attracted attention. In the vacuum valve system, the main contact is sealed in a high vacuum vacuum valve, and the current is cut off by opening and closing the vacuum valve, so that excellent dielectric strength and arc extinguishing performance can be exhibited.

In addition, no arc is generated in the oil tank 50, and consumption of the main contact can be suppressed. Further, since the insulating oil 56 in the oil tank 50 is not contaminated, the filtering operation of the insulating oil 56 is not necessary, and the maintenance inspection work interval can be extended. Thereby, maintainability improves and working cost reduces.

JP 2006-520535 A Japanese National Patent Publication No. 11-504755

Since the switching switch of the vacuum valve system has the above merits, it is desired to change from the arc-in-oil switching system. However, the following problems have been pointed out when changing the system. When changing the switching switch 54 from the arc-in-oil switching method to the vacuum valve method, the fixed contact 47 among the members attached to the inner wall surface of the oil tank 50 is housed in the vacuum valve, but the fixed-side energizing contact Since 48 is attached to the inner wall surface of the oil tank 50, it is necessary to replace it with that for the vacuum valve system.

In the vacuum valve system, a large number of vacuum valves are arranged, and their opening / closing mechanism is also indispensable. Therefore, the layout of the members arranged in the oil tank was greatly different from that in the oil arc switching system. Therefore, conventionally, when changing from the arc-in-oil switching system to the vacuum valve system, the entire oil tank 50 is replaced or the oil tank 50 is modified for the vacuum valve system.

However, since the oil tank 50 is directly installed in the transformer main body tank 60, it is difficult to remove it from the transformer main body tank 60. Further, the service life of the oil tank 50 is normally set to be as long as that of the transformer main body tank 60. For this reason, the switching switch 54 is desired to be changed from the arc-in-oil switching system to the vacuum valve system. On the other hand, the oil tank 50 continues to be used with the transformer main body tank 60 for a long time without replacement or modification. There is a desire to want.

Recently, it has been demanded to enhance the function of drawing out the maximum performance at low cost, the so-called retrofit function, by utilizing the existing equipment as effectively as possible. For this reason, in the field of on-load tap switching devices, even when changing from the arc-in-oil switching system to the vacuum valve switching switch, the oil tank 50 with a long service life can be replaced or remodeled. It is expected to be used as it is.

In addition, the vacuum valve type switching switch is provided with a plurality of drive mechanisms such as a mechanism for opening and closing the vacuum valve and a mechanism for operating the current-carrying conductor in conjunction therewith. As these drive mechanisms, those having a complicated structure such as a toggle link mechanism are generally used. In particular, when a large number of vacuum valves are arranged in the vacuum valve system, it is difficult to construct a drive mechanism in a limited space in the oil tank 50.

The embodiment of the present invention has been proposed in order to solve the above-mentioned problems, and its purpose is to ensure compatibility of the oil tank when changing from the arc-in-oil switching system to the vacuum valve system, and to retrofit it. An object of the present invention is to provide an on-load tap changer capable of enhancing functions and simplifying a component configuration to enhance space and easily construct a drive mechanism.

In order to achieve the above object, an embodiment of the present invention includes a vacuum valve type switching switch in an oil tank filled with insulating oil, and the switching switch includes a vacuum valve for storing a main contact; The on-load tap switching device provided with a conducting conductor that reduces the current flowing through the main contact is characterized by the following points.

(A) an energizing cam that rotates about a central axis of the switching switch;
(B) a parallel link mechanism that receives the rotational force of the energization cam and drives the energization conductor in parallel in the radial direction of the switching switch;
(C) a fixed-side energizing contact that is attached to the inner wall surface of the oil tank and is capable of contacting and separating from the energizing conductor.
(D) The switching switch is configured to be attachable to and detachable from the oil tank in a state where the fixed-side energizing contact is attached to the oil tank.

The block diagram of 1st Embodiment. The perspective view of the whole switching switch of 1st Embodiment. The perspective view of the interruption | blocking part of the switching switch of 1st Embodiment. The perspective view of the parallel link mechanism of 1st Embodiment. The perspective view of the parallel link mechanism of 1st Embodiment. The perspective view of the parallel link mechanism of 1st Embodiment. The side view of the parallel link mechanism of 1st Embodiment. The top view of the parallel link mechanism of 1st Embodiment. The top view for demonstrating operation | movement of the parallel link mechanism of 1st Embodiment. The perspective view for demonstrating operation | movement of the parallel link mechanism of 1st Embodiment. The perspective view for demonstrating operation | movement of the parallel link mechanism of 1st Embodiment. The perspective view for demonstrating operation | movement of the parallel link mechanism of 1st Embodiment. The perspective view for demonstrating operation | movement of the parallel link mechanism of 1st Embodiment. The perspective view for demonstrating operation | movement of the parallel link mechanism of 1st Embodiment. The circuit breaker circuit of the switching switch of 1st Embodiment. The switching sequence of the interruption | blocking part of the switching switch of 1st Embodiment. The block diagram of the general tap switching device at the time of a load. The principal part perspective view of the switching switch of the arc switching system in oil. The principal part top view of the switching switch of the arc switching system in oil. The perspective view which shows the general view of the oil tank which accommodates the switching switch of the arc switching system in oil.

(First embodiment)
(Constitution)
The first embodiment will be specifically described with reference to FIGS. The first embodiment is obtained by improving the switching switch of the on-load tap switching device, and the same members as those of the conventional on-load tap switching device shown in FIG. Is omitted.

(Features of switching switch)
As shown in FIG. 1, the switching valve 46 according to the first embodiment employs a vacuum valve system, and a fixed energizing contact 48 is attached to the inner wall surface of the oil tank 50. The structures of the oil tank 50 and the fixed-side energizing contact 48 are the same as those in the conventional arc-in-oil switching system shown in FIGS. That is, the fixed side energizing contact 48 is the neutral

point energizing contacts

30, 32, the M1 side tap energizing contact 31, and the M2 side tap energizing contact 33 shown in FIG.

The first embodiment is characterized in that the switching switch 46 is configured to be detachable from the oil tank 50 while the fixed-side energization contact 48 is attached to the oil tank 50. For this reason, when the switching switch 46 is removed from the oil tank 50 or when the switching switch 46 is attached to the oil tank 50, the switching opening / closing is also performed on the oil tank 50 side at a position that obstructs the attaching / detaching operation of the switching switch 46. No component is provided on the container 46 side.

(Overall switch)
As shown in FIG. 2, the ground shield 18 is installed above the switching switch 46, and the energy storage mechanism 19 is attached below the shield 18. A blocking part 49 is incorporated in the lower part of the energy storage mechanism 19. A slide neutral point contact 20, a slide M1 contact 21, and a slide M2 contact 22 are provided on the outer peripheral portion of the blocking portion 49.

The slide neutral point contact 20, the slide M1 contact 21, and the slide M2 contact 22 are in contact with the neutral point connection terminal 14 and the tap connection terminals 15 and 16 (located outside the oil tank 50) described in FIG. , A contact for drawing current into the switching switch 46. Further, a current limiting resistor 23 and a varistor 24 are provided below each of the contacts 20-22. The varistor 24 protects the portion between the breaking electrodes of the switching switch 54 when an abnormal surge voltage is applied between the taps.

(Switching switch breaker)
The interruption | blocking part 49 of the switching switch 46 is demonstrated using FIG. In FIG. 3, the M1 side main valve 2, the M2 side main valve 3, the M1 side resistance valve 5, and the M2 side resistance valve 6 are provided as vacuum valves, with the left side as the M1 side and the right side as the M2 side which is the opposite electrode. . All of these vacuum valves are formed of a cylindrical member, and are installed so that the longitudinal direction thereof is parallel to the axial direction of the blocking portion 49.

The shut-off part 49 is provided with three phases of U-phase, V-phase and W-phase, and four vacuum valves per phase and a total of twelve vacuum valves in total for three phases are attached to the shut-off holder 4. . The blocking holder 4 is provided in the middle of the blocking portion 49. One blocking holder 4 is provided for each phase, and a vacuum valve opening / closing mechanism including four vacuum valves and a parallel link mechanism for driving the conducting

conductors

7 and 8 in parallel are attached.

Further, the M1 side energizing conductor 7 and the M2 side energizing conductor 8 are provided close to the M1 side resistance valve 5 and the M2 side resistance valve 6, respectively. The current-carrying

conductors

7 and 8 are closed and energized after the tap switching, thereby suppressing the deterioration of the interruption performance in the interruption section 49 and improving the durability performance, thereby contributing to the downsizing and simplification of the switching switch 46. Is. Further, a resistance switch holder 9 is provided below the

resistance valves

5 and 6. The resistance switch holder 9 incorporates a switch mechanism (not shown) that ensures insulation of the non-energized side tap.

The switching crank 1 is provided at the upper part of the blocking part 49. The switching crank 1 is connected to a vacuum valve opening / closing mechanism, a parallel link mechanism for driving the energizing

conductors

7 and 8 in parallel, and a switch mechanism for ensuring insulation of the non-energizing side tap. These mechanisms are driven.

(Parallel link mechanism)
Next, a parallel link mechanism that drives the current-carrying

conductors

7 and 8 in parallel will be described. The parallel link mechanism is a contact energization mechanism that operates the

energization conductors

7 and 8, and receives the rotational force of the

energization cams

26 and 29 to cause the

energization conductors

7 and 8 to move in and out in the radial direction of the switching switch 46. This is a mechanism for switching between energization by alternately short-circuiting between the M1 and M2 taps in the energizing contact 48.

The energizing cam 26 is a member that operates the parallel link mechanism, and is a disc-shaped cam member that is rotatably provided around the central axis of the switching switch 46. As shown in FIGS. 3 and 4, the energization cam 26 is disposed so as to engage with the upper portions of the

energization conductors

7 and 8. The energization cam 29 is disposed so as to engage with the lower portions of the

energization conductors

7 and 8 as shown in FIG.

The structure of the parallel link mechanism will be described in more detail. As shown in FIG. 4, the parallel link mechanism is provided with a pair of energizing links 27, and the energizing

conductors

7 and 8 rotate at one end of the energizing link 27 via connecting

shafts

7b and 8b. It is supported freely. An energization link support pin 28 is attached to the other end of the energization link 27. The energizing link support pin 28 is a member extending in parallel to the axial direction of the blocking portion 49. An end portion of the energization link support pin 28 is rotatably supported by an energization link support hole 25 (shown in FIG. 5) formed in the blocking holder 4.

As described above, the neutral

point energizing contacts

30 and 32 and the M1 and M2 side

tap energizing contacts

31 and 33 are provided on the oil tank 50 side as the fixed energizing contact 48. These energizing contacts 30 to 33 will be described with reference to FIGS. As shown in FIGS. 6 and 7, the M1 side tap energizing contact 31 is disposed below the neutral point energizing contact 30, and the M2 side tap energizing contact 32 is disposed below the neutral point energizing contact 32. Has been.

As shown in FIGS. 7 and 8, drive

rollers

7a and 8a are rotatably attached to the upper and lower ends of the current-carrying

conductors

7 and 8, and the

drive rollers

7a and 8a are sandwiched from above and below. An upper energizing cam 26 and a lower energizing cam 29 are provided.

Cam grooves

26a and 29a are formed in the energizing

cams

26 and 29, and the driving

rollers

7a and 8a are engaged therewith.

Therefore, when the

energization cams

26 and 29 rotate, the

cam grooves

26a and 29a move the

drive rollers

7a and 8a, and the

energization conductors

7 and 8 are driven. The driven current-carrying

conductors

7 and 8 are moved in and out in the radial direction of the switching switch 46, and thereby contact or retreat with respect to the current-carrying contacts 30 to 33 fixed on the oil tank 50 side, and M1 and M2 The tap energization is switched.

The parallel link mechanism in the present embodiment is disposed at both ends of the divided area per phase. That is, as shown in FIG. 8, the three phases (U phase, V phase, W phase) are arranged in a similar manner by dividing 120 degrees, and the parallel link mechanism is formed in the blocking holder 4 at both ends of each region of the three phases. The energized link support hole 25 (shown in FIG. 5) is supported and arranged in a mirror image. Further, as shown in FIG. 8, M1, M2

side resistance valves

5, 6 are arranged between the parallel link mechanisms.

(Operation of parallel link mechanism)
The operation of the parallel link mechanism, that is, the energizing contact mechanism of the switching switch according to the first embodiment will be described with reference to FIGS. 9A, 9B and 9C and FIGS. In FIG. 9A, the M1 side is closed and becomes the M1 side energization closing part 34, and the M2 side is opened and becomes the M2 side energization opening part 35. This state corresponds to FIG. In FIG. 10, the energization conductor 7 on the M1 side is energized ON, and the energization conductor 8 on the M2 side is energized OFF, which is the energization position of M1.

When the energizing

cams

26 and 29 rotate counterclockwise from this state, both M1 and M2 are in the open state as shown in FIG. 9B. That is, the energization closing part 34 on the M1 side becomes the energization opening part 36, and the energization opening part 35 on the M2 side remains as it is. This state corresponds to FIGS. That is, the switching operation for retracting the energization conductor 7 on the M1 side is performed, and in FIGS. 11 and 12, the energization OFF is performed on both the M1 side and the M2 side. Then, at the stage of FIG. 13, the current-carrying conductor 8 on the M2 side starts to move outward from the central direction with respect to the radial direction of the switching switch 46.

When the

energization cams

26 and 29 continue to rotate counterclockwise, as shown in FIG. 9C, the M1 side is in an open state, the M2 side is in a closed state, and the energization open portion 36 on the M1 side remains. The M2 side becomes the energization closing portion 37 and the tap switching operation is completed. This state corresponds to FIG. In FIG. 14, the energization conductor 7 on the M1 side is energized OFF, and the energization conductor 8 on the M2 side is energized ON, which is the energization position of M2.

FIG. 15 shows a circuit diagram of the blocking unit 49 of the present embodiment. (A), (B), and (C) shown in FIG. 9 correspond to (a), (b), and (c) in FIG. 15, respectively. In FIG. 15, the parallel link mechanism, which is a contact energization mechanism, has M1 side as Bso and M2 side as Bse. Reference numerals 34 to 37 in FIG. 15 are the same as those in FIG. 9. 34 denotes an energization closing part on the M1 side, 35 denotes an energization opening part on the M2 side, 36 denotes an energization opening part on the M1 side, Reference numeral 37 denotes an energization closing part on the M2 side.

FIG. 16 shows an example of a switching sequence of the blocking unit 49 of the present embodiment. In this embodiment, the switching angle range is 0 to 75 °, and the M1 side is set to 0 to 10 ° closed and 10 to 75 ° opened. Further, the M2 side is set to open from 0 to 65 ° and closed from 65 to 75 °.

Reference numerals

34 and 35 in FIG. 16 are the same as those in FIG. 9. Reference numeral 34 denotes an energization closing part on the M1 side, and 35 denotes an energization opening part on the M2 side.

(Action and effect)
The first embodiment as described above has the following operations and effects.
(1) In the first embodiment, the switching switch 46 can be attached to and detached from the oil tank 50 while the fixed-side energizing contact 48 is attached to the oil tank 50. The structure of the oil tank 50 and the fixed-side energizing contact 48 attached thereto is the same as that of the conventional arc switching method in oil shown in FIG.

Accordingly, even if the switching switch 46 is changed from the arc-in-oil switching system to the vacuum valve system, the compatibility of the oil tank 50 that houses the switching switch 46 can be ensured, and the oil tank 50 cannot be replaced or modified at all. It is unnecessary. Therefore, the oil tank 50 can be continuously used without being replaced or modified. Thereby, the oil tank 50 having the same life as the transformer main body tank 60 can be used continuously for a long time, and the retrofit function is improved.

(2) The parallel link mechanism that drives the current-carrying

conductors

7 and 8 in parallel can be configured with only simple components such as the current-carrying link 27 and the current-carrying link support pin 28. The energizing

cams

26 and 29 for applying a driving force to the parallel link mechanism are disk-like members that rotate around the central axis of the switching switch 46, and the switching switch 46 is less likely to swell radially. There is no worry of becoming larger.

Therefore, in the first embodiment, the energizing contact mechanism can be provided in a space-saving manner. In the first embodiment, as many as twelve vacuum valves are arranged, the space in the oil tank 50 is narrowed, but by adopting a parallel link mechanism with good space characteristics, the mechanism construction becomes easy and the vacuum is reduced. A valve system can be implemented reliably.

(3) Since the current-carrying

cams

26 and 29 are engaged with the upper and lower portions of the current-carrying

conductors

7 and 8, the current-carrying

cams

26 and 29 can equally handle the contact pressure of the current-carrying

conductors

7 and 8 from the vertical direction. Accordingly, the current-carrying

conductors

7 and 8 can obtain a sufficient contact force with respect to the current-carrying contacts 30 to 33, and the parallel link mechanism can obtain high reliability as the current-carrying contact mechanism.

(4) In 1st Embodiment, the parallel link mechanism which is an electricity supply contact mechanism is arrange | positioned at the both ends of the division area per phase. Therefore, a plurality of vacuum valves can be arranged per phase between the parallel link mechanisms. As a result, the space can be further improved, and the switching switch 46 can be further reduced in size.

(5) A vacuum valve opening / closing mechanism and an energizing contact mechanism, that is, a parallel link mechanism, are attached to one blocking holder 4 provided for each phase, so that the driving timing of the vacuum valve and energizing contact per phase are driven. The timing can be guaranteed by the manufacturing accuracy of the blocking holder 4 which is a single member. Therefore, the drive timing is not affected by the assembly accuracy of the opening and closing mechanism of the vacuum valve and the parallel link mechanism that is the energizing contact mechanism, and the timing of driving the vacuum valve and energizing contact can be matched with high accuracy. Is possible.

(Other embodiments)
The above embodiment is presented as an example in the present specification, and is not intended to limit the scope of the invention. In other words, the present invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and their equivalents as well as included in the scope and gist of the invention.

For example, with respect to the switching switch excluding the fixed-side energization contact, an opening that can be taken out from the oil tank is provided on the oil tank side, and a lid that closes the opening is slidably disposed in the horizontal direction. Good. According to such an embodiment, even if a deceleration hagulma mechanism or the like is provided in the vicinity of the opening, the lid of the switching switch from the oil tank can be opened by sliding the lid so as not to hit these mechanisms. The take-out operation can be performed efficiently.

DESCRIPTION OF SYMBOLS 1 Switching crank 2 M1 side main valve 3 M2 side main valve 4 Shut-off holder 5 M1 side resistance valve 6 M2 side resistance valve 7 M1 side energization conductor 8 M2 side energization conductor 9 Resistance switch holder 14 Neutral

point connection terminal

15, 16 Tap connection terminal 18 Ground shield 19 Energy storage mechanism 20 Slide neutral point contact 21 Slide M1 contact 22 Slide M2 contact 23 Current limiting resistor 24 Varistor 25 Energizing link support holes 26, 29 Energizing cam 27 Energizing link 28 Energizing

link support pin

30 , 32 Neutral point energization contact 31 M1 side tap energization contact 33 M2 side tapping energization contact 34 M1 side energization closing part 35 M2 side energization opening part 36 M1 side energization opening part 37 M2 side energization Closed part 46 Switching switch 47 Fixed contact 48 Fixed side energizing contact 49 Breaking part 50 Oil tank 51 Load tap changer 52 Load tap Exchanger 53 motor operation mechanism 54 switching switch 55 tap selector 56 insulating oil 60 transformer tank

Claims

When a vacuum valve type switching switch is housed in an oil tank filled with insulating oil, the switching switch is equipped with a vacuum valve that houses the main contact, and a current-carrying conductor that reduces the current flowing through the main contact. In the tap switching device,
An energization cam that rotates about the central axis of the switching switch;
A parallel link mechanism which receives the rotational force of the energization cam and drives the energization conductor in parallel in the radial direction of the switching switch;
A fixed-side energizing contact that is attached to the inner wall surface of the oil tank and is capable of contacting and separating from the energizing conductor;
Have
The on-load tap switching device, wherein the switching switch is configured to be detachable from the oil tank in a state where the fixed-side energization contact is attached to the oil tank.
2. The oil tank and the fixed-side energizing contact are the same as those used in a switch for an arc-in-oil switching system in which a blocking portion is exposed in insulating oil in the oil tank. Tap switching device when loaded.
The on-load tap switching device according to claim 1 or 2, wherein the energization cam is arranged to engage with an upper portion and a lower portion of the energization conductor.
The on-load tap switching device according to any one of claims 1 to 3, wherein the parallel link mechanism is arranged at both ends of a divided area per phase in the switching switch.
Provide one blocking holder per phase in the switching switch,
The on-load tap switching device according to any one of claims 1 to 4, wherein the vacuum valve opening / closing mechanism and the parallel link mechanism are attached to the shut-off holder.