JPS5946723A - Vacuum breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum breaker that fully improves the breaking performance by applying a full magnetic field parallel to the arc that occurs during breaking.

Conventionally, when the arc is cut off, a magnetic field (so-called longitudinal magnetic field) in the same direction as the arc is generated between a pair of contacts. [-A large number of vacuum breakers have been proposed that aim to achieve the same breaking performance by applying an applied voltage to the furnace.This type of vacuum breakers consist of a vacuum interrupter that serves as the opening/closing part, and a coil for generating a magnetic field is integrally attached to the vacuum interrupter. This type of vacuum interrupter can be roughly divided into those with a metal coil inside the vacuum container as shown in Figure 1, and those with a coil outside the vacuum container as shown in Figure 2. It can be separated into things.

That is, the vacuum interrupter 1 in FIG.
? A pair of lead rods 2a and 2bk (if any, both lead rods 2
The inner ends of the leads 2a and 2b are respectively equipped with high resistance elements 21 and contacts 8a and 3b, and the lead rod 2a.

2b and the contact point +(a t JJ b) A current lead rod 2 m long, a coil that changes the current surrounding the 2b and generates a current parallel to the arc.
a and 4b, and at least one mounting rod 2b
is provided between the bellows 22 and the vacuum vessel 10 and has an axial opening (
It is configured to be movable in the vertical direction (in the figure).

The vacuum interrupter l configured as above is
A lead-out conductor 5m is housed in an insulating frame (not shown) and is provided at one end of a terminal portion 51 that can be freely affixed to a main circuit conductor (not shown) at the outer end of each lead rod 2a, 2b.
5b are connected to each other, and an operating device (not shown) is further attached to form a necessary vacuum breaker. Note that 9a and 9b connected to the terminal portion 51 are main circuit conductors.

By the way, the vacuum interrupter constructed as shown in FIG. 1 described above has the following drawbacks.

(2) Since the coil electrodes 4a and 4b are located inside the vacuum container 100, the coils generate heat due to current flow.

In the case of V1, this heat is difficult to dissipate to the outside I11, which makes it unsuitable for large current applications.

■ Contacts 3a and 8b at the tips of lead rods 2a and 2b.

Since the coil 'Ft1#1.4a, 4b and the high-resistance element 21 are integrally connected by brazing on multiple members, the number of parts and processing steps are large, and the number of parts to be brazed is large. As a result, durability was poor.

Therefore, especially in the case of a vacuum interrupter 1 with a large capacity M (for high voltage or large current), the contacts 8a, :3b and the coil electrodes 4a, 4b are large and heavy, so the impact during operation is large. This resulted in a significant decrease in durability.

■ Coil tl! Q4 a, 4 b B, each contact 3
Since they are located on the backs of the coil electrodes 4a and 3b, when one of the lead rods 2b moves (moves downward in the figure) at 1 o'clock, the pair of coil electrodes 4a and 4b
The gap will widen. As a result, as the distance between the contacts becomes wider, the magnetic field gradually attenuates, causing the diffused arc to become concentrated due to the attenuation of the magnetic field, which adversely affects the breaking performance.

From the above, a vacuum interrupter is constructed of coil electrodes 4a, 4bi for generating the entire R magnetic field as shown in FIG. 1 naturally has a limit in terms of shutoff performance, and although it is suitable for relatively low capacity and large quantities, it is not the same as the high-quality M1. this.

For these reasons, as for large capacity vacuum increctors, historically, the vacuum interrupter as shown in Figure 2 was proposed in 1971 earlier than the first direct air interrupter. Kanmagnetic field? +1? The technology of vacuum interrupters in which the coil conductor 4 to be generated is arranged outside the vacuum vessel IO has been looked at. Next, I will explain the vacuum interrupter shown in Fig. 2 in its entirety, or I will give a detailed explanation of the vacuum interrupter shown in Fig. 1 by assigning the same reference numerals to the same parts as those shown in Fig. 1. , 1JTj are omitted.

'j, that is, the inner end 1 of lead 4+'P2 a, 2 b
1 (flu is provided with only contacts 3a and 8b, respectively.) A coil conductor 4 for generating vertical magnetic field sound is provided on the outer periphery of the empty container 10.
One winding of this coil conductor 4: M side t connection lead (
+ a 'tc via [^1 constant side glued to the outer end of the god 2a J7j continuation-c5its'! The other end of the winding is connected to the lead-out conductor 5a via a connecting lead 6b. And vacuum interrupter 1 configured like this?
The vacuum breaker is constructed by being housed in an insulating frame (not shown).

By the way, in the vacuum interrupter 1 as shown in FIG. 2, (1) Since the coil conductor 4 is provided outside the vacuum vessel 1o, even if heat is generated in the coil conductor 4, the contacts 3a, 8
There is no negative impact on B etc. (2) Since the coil conductor 4 has both legs, even if the gap between the pair of contacts 8a and Bb widens during disconnection, the magnetic field applied to the arc does not attenuate and remains constant. ■Only the contacts 8a and 8b need to be provided at the inner ends of the lead rods 2a and 2b, and the structure is simple. It is. There are various advantages such as f+Ii.

However, in the conventional vacuum interrupter 1 of this type, the coil conductor 4 is insulated and integrally connected to the outside 11'I of the vacuum vessel 10.
For example, since the vacuum interrupter J- including the coil conductor 4 has a large external shape, the empty interrupter 1 is exactly
The size of the insulating beam becomes larger accordingly, and as a result, the size of the breaker becomes larger.

Also, the connection leads 6a and 6b that connect the coil conductor 4, the lead rod 2a, and the lead-out conductor 5a are coils of elementary conductors that form the coil conductor 4! IA? Since it was formed by extending it to the housing, these connection leads Qa,
There is a drawback that the work of individually connecting the leads 6b to the leads 4, 1ξ2a and the drawer 2 thick body 5a is very complicated.

The present invention has been made in view of the above points, and includes a lead-out conductor connected to an outer end of a lead rod of an empty interrupter. IM Zheng and the connecting part and the spacer that electrically separates both of them are integrally rr'l Dk L, while the coil conductor, the vacuum interrupter and the drawer 2! By attaching the coil conductor to an insulating frame that holds and fixes the coil conductor, and connecting both winding ends of the coil conductor to the terminal and connecting portions of the lead-out conductor using connection leads through elastic contacts, the structure can be further improved. The present invention provides a vacuum breaker that achieves the same level of breaking performance and is easy to assemble.

Next, embodiments of the present invention will be explained based on FIGS. 8 to 8.

First, FIG. 8 shows a cross-sectional side view of the main part of the vacuum breaker, showing the negative phase component +1.

A pair of lead rods 2a that pass R through the vacuum container 10 airtightly,
Inner edge of 2b? flt has g points: 3 a, 8 b
frLR'& cut off, and one lead rod 2al! The vacuum interrupter 1 is configured by a fixed foot extension 11 and a stand 2b movable via 22 bellows. "t, fc" is housed in an insulating frame 8 with a gap provided therein, and is held and fixed to this insulating frame 8 via a pair of lead-out conductors 5a and 5bk.

In other words, one of the lead-out conductors 5a is connected to the upper neck J Hll of the insulating frame 8 at one end 1111 (right side in the figure) of the lead-out conductor 5a.
The fixed-side glue rod 2a of the vacuum interface 2 is connected to the MIS 52 at both ends. Sweet other drawer 2
, 4f wire 5b is fixedly fixed to the middle part of the insulating frame 8, and the lead rod 2b on the movable side of the vacuum interrupter l is movably connected to the ring contact 58 provided on the 1/2 inch connection 52 of the lead-out conductor 5b. (In the figure, it can be freely inserted in the vertical direction).

The pair of lead-out conductors 5a and 5b are both directed in the same direction (
9) and the lead-out conductor 5
a, 5b (K (contact + qtt free) is formed at the left end ((U) of the terminal part 51 so that the contact 54 is attached to the end of the main circuit conductor 9a and 9b so that the end Vr-meshing contact can be made. ing.

The terminal portion 61 and connecting portion 52 of the lead-out conductor 5b located on the lower side are integrally uniaxially formed of a highly conductive material such as steel.

On the other hand, in the lead-out conductor a located on the upper side, the terminal 1551 and the connecting part 52 are formed of steel material, and both are integrally connected (-shaft-shaped) at the base +j7 electrically separated from each other.
It is composed of a combination of P! within the insulating frame 8 and the vacuum interrupter 1 (particularly the pair of contacts 25a
, 8b), a coil conductor 4 is buried in the area surrounding the coil conductor 4, and both winding ends 41 and 42 of the coil conductor 4 protrude outward from the insulating frame 8, respectively. At the same time as the drawer 4 ('E 5 a), both winding ends 41 and 42 of the coil conductor 4 and the terminal portion 51 and the connecting portion 52 of the drawer conductor 5 a are connected to each other. are separately formed connection leads U b and Oa.
Vt is connected.

In addition, in the 8th N, 81 is 114γ5 edge frame 8
It is a pedestal frame on which is erected, and has a built-in operating device (not shown). Reference numeral 82 is an operating rod, the upper end of which is connected to the movable lead rod 2b of the vacuum ink cleaner 1. The lower end side is operatively connected to an operating device (not shown) within the gantry frame 81. 88 is a surface plate erected on the stand frame 81.

Next, the structure of the lead-out conductor 5a and the coil conductor 4 and the connection part 1
To explain this based on FIGS. 4 and 5, the lead-out conductor 5R is linearly connected integrally with the terminal TH151 made of steel material through the connection 11552 or 7 spacers, and ! ; Stepped hole 55 in 1a child part 51
A similar stepped hole 57 is provided in the connecting portion 62, and an elastic contact 5 (for example, a ring contact or a multi-contact) is installed and fixed therein. There is.

On the other hand, the coil conductor 'H,j:, As shown in Fig. 4, the thickness (
A flat rectangular conductor having a width (B) of 9 widths (B) is wound in approximately one turf state, and both winding end portions 41 and 42 are opposed to each other with a gap interposed therebetween, and are provided so as to protrude outward in the radial direction. Ori,
Furthermore, mounting seats 48 and 44 are provided at the tip IS of each winding end portion 41 and 42, respectively. This mounting seat 48, 4
4 are each provided with stepped holes 45, 40 and are fitted with elastic contacts 47, 48, as shown in FIG.

This stepped hole 45°46 is located on one side (
Although there is a hole in the lead-out conductor 5ai11tl),
It is not open on the other side (the lead-out conductor 6bπlil...see FIG. 3). This is because the mounting seat 4:I, 44 is located at the middle part V (V) of the pair of lead-out conductors 5g, 5b, so the other lead-out conductor 5bVC approaches, and the stepped hole 45.4fi is on the side of the lead-out conductor 5b. If there is an opening in the opening, there is a risk of flashover caused by the protrusion of this opening, and in order to prevent this, the stepped hole 45
, 46 are neatly installed without penetrating them. Of course, if the mounting seats 43 and 44 are coated with insulation, they can also be used as through holes.

The fc connection leads t5a and lJb are made of steel, for example, and are shaped like round bars as shown in FIG. 5, and are provided with a large head 61 at one end (upper end in the figure). has been done.

The lead-out conductor 5a, the coil conductor 4, and the N! : Connecting leads (5a, Ub's ■I5 material is the elastic contact 5G in the terminal part 51 of the drawer conductor 5a, and the elastic contactor 5G in the mounting seat 43 of the coil conductor 4). b, and is connected by the insertion of lead conductor 6a.
The elastic contact 58 in the connection part 62 of the coil conductor 4 and the elastic contact 48 in the mounting seat 44 of the coil conductor 4 are connected to the other connection lead 6.
They are connected by fitting (a) and are assembled together.

Next, the entire flow of current in the vacuum breaker configured as described above will be explained based on FIG. 4 while referring to FIG. A loop current flows from the connection node 6b (II)% and flows through the coil conductor 4? >I
C (It), a magnetic field sound is generated, and the connection part 5 is connected to the other 12 lead Oa flow 7l-(Is).
2 (h) s and the glue on both legs of the vacuum interrupter 1 a % pair of contacts H (a , 8 b
(at the time of cutoff K)l arc), and the other lead-out conductor 5bVc via the lead rod 2b on the movable side.

The lead-out conductor 5n and the coil conductor 4 configured as described above.
An example of the assembly work of the insulating frame 8 and the vacuum interface 2 (fixed side gluing rod 2a) will be described. First, four coil conductors are attached to the insulating frame 8.

Connection of the lead-out conductor 5a vJIS52 and the lead rod 2a on the solid side of the vacuum interrupter 1 are fully connected. Then, the vacuum interrupter 1 in this state is inserted into the insulating frame 8 from the upper part, and the connecting part b2 of the conductor 5a is brought into contact with the upper end surface 8a of the insulating frame 8 (see Figure 3), and the mounting port is attached. Place both feet at 8b. Next, the elastic contact 66 of the terminal part 51 of the lead-out conductor 5a is inserted and inserted, and the elastic contact 47 in the mounting seat 43 of one winding end 41 of the coil conductor 4 is inserted.
The elastic contact of the connection part b2 of the lead-out conductor 5a [i8 is held down by 10i, and the mounting seat 44 of the other winding ψilA part 42 of the coil conductor 4 is inserted into the Part 1: By fitting 12 into the contactor 48 and attaching the other connection lead 6a, it is assembled and connected mechanically and electrically.

Next, the embodiment shown in FIG. Is it equivalent to the one shown in Figure 5?
With these explanations? Omitted.

In other words, connection leads fJa, lJb, one end S(
(lower end in the figure) with a screw 62 ligature (#tf to form 4Yl,
Attachment of the coil conductor 4 to the stepped holes 46 and 45 of 44 and 413, respectively, with grooves 4 o a and 45 a'
The connecting lead 6a, tJb elastic contacts 58, 48, and 50.47 are fitted and screwed onto the receiving seat 44.48 of the coil conductor 4 to form a coupling structure. This is what I did. This 4N formation
For example, the connection leads (5a, Ob) can be securely attached and fixed.

In addition, if the winding ends fi1141, 42 of the coil conductor 4 and the connection leads Qa, Ubk are covered with an insulating material (for example, by covering the connection leads 6a, 6b with insulating tubes during assembly), the other lead-out conductor 5b or the ground This provides sufficient insulation strength between the two. Furthermore, the insulating frame 8 is not limited to a cylindrical shape as in the above-described embodiment, but may also be composed of a plurality of rod-shaped insulating columns.
This “1!” In case of h, the coil conductor 4 is covered with insulation and arranged Ft.
, then it's good. Furthermore, the winding ends 41 and 42 of the coil conductor 40 are not limited to protruding outward from the insulating frame 8 as described above, but are buried within the insulating frame 8, and the connecting leads 6a, There is no problem even if the structure is such that the tjb is inserted seven times into the insulating frame 8 (in the vertical direction).

In addition, the VC of the present invention is not limited to the case where four coil conductors are connected to one (upper) lead-out conductor 5a, but may also be connected to the other (lower) lead-out conductor 5b and the coil conductor 4. Alternatively, it is also possible to provide two coil conductors and connect them to the lead conductors 5a and 5b, respectively.

As is clear from the above description, the present invention provides various effects as described below.

■ Vacuum interrupter 1 and coil conductor 4 are separated [1i
-1 conductor 5a with 1 vacuum incretor
, 5byK: The coil conductor 4 is fixedly attached to the insulating frame 8 through the insulating frame 8VC, and the coil conductor 4 and the connecting lead 8a are connected to the lead conductor 5a (or 5b). , (Vertical magnetic field application type vacuum cut-off for the first time by connecting with J b)
Or coil Tl inside: 31144 a, 4 b
(see Figure 1) or directly equipped with a coil/J body 4 (see Figure 2) on the outside. Compared to the structure of the breaker system, the structure of the vacuum ink converter 1 itself is extremely simple, and it is a breaker which is safe and easy to operate while standing.

■ Vacuum interrupter 1 lead doy “il 2 a (
2b) K-connected drawer 2j 1 body 5a (5b)
7) s, terminal rls 51, connection part 52, and these are all electrically r (separated by spacer 7). Fixed vc and ekey n7? : :J-f
Le 梼：体4 ノboth volumes 9: M 'rflj 4 ],
By connecting each of the 42 pieces separately to the terminal 11551 and the connection part b2, the vacuum chamber which can apply a strong C magnetic field can be easily constructed, and the coil conductor 4 is of the double-leg type. Therefore, even if the distance between the pair of contacts 3a and 3b widens during the cutoff, the magnetic field does not attenuate, and the same or better cutoff performance can be achieved.

(2) The connection leads Ua and 8b are in the shape of an I-shaped body, and are connected to the connection portion 52 of the eyelid conductor 5a. The winding ends 42141vc of the coil conductor 4 are connected to the terminals Ti1151 through elastic contacts 58 and 56, respectively, and the elastic contacts 48 and 48 are connected to the terminal Ti1151, respectively.
．． Since the connection is made through a 47-ft-long wire, not only can these connecting leads Ua and Ub be easily inserted and installed, but also electrical and mechanical connections can be made reliably. Moreover, each part 1 between the opposing lead-out conductor 5a (5b) and the coil conductor 4 is made the same size (vertical interval dimension), and a force of 11 hours is applied.
Even if there is a difference in C4 and a button position error, the above-mentioned error is It can be easily absorbed and a reliable electrical and mechanical connection can be made.

[Brief explanation of the drawing]

1 and 2171 are schematic cross-sectional views of a conventional vacuum interrupter, FIG. 8 is a cross-sectional side view of essential parts of a vacuum breaker according to an embodiment of the present invention, and FIG. 4 is a drawer shown in FIG. 3. An assembled perspective view of a conductor, a coil conductor, and a connection lead; FIG. 5 is a sectional view taken along the line AA and ' of FIG. 4; FIG. 6 is a four-part 1tl diagram corresponding to FIG. 1 is the vacuum interrupter, 10 is the air conditioner, 2a is the lead rod, 2b is the lead rod sda+Jb is 4, 3 is the point, 4 is the coil conductor, 4 ], 42 is the winding end. , 5
a, 5b FJ, drawer', body, 51 is ψIM child 1b2 is connection part, 47, 48. 50.581 elastic contactor, (la, Ub are connection leads, 7 is a spacer, 8 is an insulating frame, 11a, 1
1b is the main circuit conductor (1).

Claims (1)

[Claims] Vacuum container +1+1)? z A pair of opposing lead rods (2a, 2b) that penetrate airtight and can move toward and away from each other.
A vacuum interrupter (1) comprising contacts (3a, 3b) k at the inner ends of these lead rods (2a, 2b), and a pair of lead rods (2a , 2b) A pair of lead-out conductors (5a, 5b) which are connected to the outer ends of the main circuit conductors (9a, i) 17j and can be freely connected and separated, and these lead-out conductors (5a, 5b) are connected to the outer ends of the vacuum interrupter (1) and the main circuit conductors (9a, i) U” conductor (5g, 5b) holding insulating frame with both legs, and the vacuum incretor (1)
In a vacuum breaker comprising a coil conductor (4) which is wound around the outer periphery of a vacuum vessel (II) and generates a magnetic field parallel to the arc generated between a pair of contacts (8a, 3b). , at least one coil conductor (4) is fixedly provided on the insulating frame, and elastic contacts (47) and (48) are provided at both winding ends (41) and (42) of the coil conductor (4), respectively. At least one lead-out conductor (5a or 5b) i of the pair of lead-out conductors (5a, 5b), the main circuit conductor (9
a, 9b); a connecting part (52) to which the lead rods (2a, 2b) of the vacuum interrupter (1) are connected; A spacer (force) is formed to form the terminal portion (51
) and the connecting part (52), respectively, an elastic contactor (5fj),
(58) A rod-shaped connection lead (Ub) 'c elastic contactor (5 ( vinegar,
(47), and completely connects the connection part (52) with the other winding end (42) of the coil conductor (4) 7 elastic contacts (58), ( 48
) A vacuum breaker characterized in that it is configured by being fitted into a