JPS60163323A - 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 [Technical Field of the Invention] The present invention relates to a buffer type gas circuit breaker, particularly a circuit breaker 8B with a high current interrupting rating.

[Prior art]

In recent years, the rated breaking current of circuit breakers has increased as the capacity of single generators has increased or as grids have become higher in voltage and capacity. Expected to be requested. usually,
Among the rated duties of the circuit breaker, the rated closing current is required to be an asymmetrical current closing force having a P aK value 25 times the rated breaking current (effective value). For example, if the rated breaking current is 250 kA, 250X2.5=625 kA
It is necessary to input the peak current without any problem. In such a large current injection MIIR, an increase in the contact pressure of the contact portion occurs due to the so-called pinch effect, which is an electromagnetic force of the contact portion, and as a result, a reaction force is generated due to an increase in frictional force against the operation in the injection direction. In addition, the traditional buffer shape is removed? In the current path of the arc extinguishing chamber, a very large repulsive force due to the Em force is generated in the movable part of the arc extinguishing chamber, and as the input current increases, the input force of the operation 41 mechanism must also be increased. , which was imitating an increase in costs.

In addition, as the rated closing Iu flow increases, the gap between the closing force required to close the circuit breaker during no-load conditions and the closing force required during rated closing and current flow increases, reaching a maximum near the final closing. It is necessary to absorb a large amount of kinetic energy, making it difficult to control the charging operation.

A conventional one is shown in Japanese Patent Application Laid-open No. 108624/1983. That is, in FIG. 1, (1) is a flange, (
2) supports a viscous constant arc contact fixed to the flange (1), and (3) is a fixed main contact which is attached to the flange peak and has a plurality of fins at the end arranged in an fM fall arrangement; It comes into sliding contact with or separates from a buffer cylinder (4), which will be described later. (4) is a buffer cylinder which also serves as a movable main contact for energization, and is driven by an operating rod (8) which will be described later. (5) is a flange, and (6) is a current-carrying finger contact whose end is aligned with the flange 15) and has a plurality of finger contacts arranged in a ring shape, and is in sliding contact with the buffer cylinder (4). (7) is a piston fixed to the flange 15), into which the buffer cylinder (4) is slidably fitted. (8) is an operating rod that has a communication hole (8a) and is moved in the axial direction jθ\ by a drive mechanism (not shown) via an absolute rod (not shown);
It is slidably supported by a piston (7). A support member (9) is fixed to the buffer cylinder (4) and the operating rod (8), and is provided with a plurality of injection holes (9a). The buffer cylinder (4), the piston (7), and the support body (9) constitute a buffer chamber tl (l), and when the buffer cylinder (4) moves to the right in the figure, the gas fluid in the buffer chamber 4 is compressed.Uυ is the operating rod)8)
A movable arc contact fixed with (Ia is possible +1i
1 An identification arc contact that can be brought into contact with and separated from arc contacts 1 and liυ, and is fixed to a fixed arc contact support t(2). (+3 is a flow guide made of an insulating material such as Teflon, which is arranged coaxially with the fixed arc contact (field), and is fixed to the support (9).

Next, I will explain the operation. In particular, in the fully closed position shown in Figure 1, the flange (υ → fixed main contact (3) → buffer cylinder +4) → finger contact (6)
, →Electricity is applied through the flange (5). When the current is cut off, the operating rod (8) is driven to the right by an operating mechanism (not shown).

In the middle of the breaking process, the fixed main contact (3) and the buffer cylinder (4) are first separated, and the current flows through the flange (1).
] → Fixed arc contact support (2) → Fixed arc contact (reinforcement → Movable arc contact αV → Operating rod (
8) → Buffer cylinder (4) → Finger contact (
6)→The flow is diverted to Yuzuji of flange 15). After holding,
Fixed arc contact (¥ and movable arc contact 0υ
is opened, and the generated arc is extinguished by the flow of compressed gas within the buffer chamber 4.

When turning on, the operation is opposite to when turning off, and first the identified arc contact (Q and the movable arc contact ((υ come into contact)
(lower half of Figure 1). Then the fixed main contact (
3) and the buffer cylinder (4) come into contact and the closing is complete.The current path at this instant of closing is shown by the arrow in the lower half of Figure 1, and this is diagrammatically expressed as a line current. s +9 (a). In the figure, the -14, - repulsive force acting on the movable part in the input direction is mainly caused by Fl and F2.
It is expressed as That is, it is the ftE Ia force for the current component (1) perpendicular to the center line, and F,, F2 are the respective magnetic fields)i,,)12. Vacuum transmittance μ. Then, Fl = fio "l' I ・11F2=μo- is expressed as 42.1.12. Generally, 1-12〉M, but in a normal buffer type arc extinguishing chamber, I + ', )l 2, so "l > F2.

Repulsion force F = Fl + F2 against input tL + 11 pieces is non-'
/iJ: and, depending on the shape of the arc extinguishing chamber and the input current value, detailed measurements have shown that it can reach a value of 7 tons.

[Invention (already required)]

The present invention has been made in view of the above, and by changing the flow path for the first time when the current is turned on, the electromagnetic repulsion force at the time of turning on a large current can be minimized, and the turning operation force can be reduced. To provide a circuit breaker that can reduce the amount of electricity.

[Embodiments of the invention]

An embodiment of the present invention will be described below. Filling 2il
The basic groove of the buffer type arc extinguishing chamber is almost the same as that in Fig. 1, but the insulating tube a< is connected to the buffer cylinder (4
) and the operating rod (8) to insulate the two from each other, and press with a ring spring 0Q.
! By providing the sub-UTI, the current path at the time of turning on is made into 4F+1 as shown in the lower half of FIG. That is,
Flange IIJ → 1Bil Constant arc contact support (
2) → Fixed arc contact ((support) → Movable arc contact (lυ → Operation r3 (8) - → Collector uIll
→ Piston (7) → Flange +5.

Near completion of closing, the fixed main contact (3) and buffer cylinder (4) are in contact, and the current path is the same as before: fixed main contact (3) → buffer cylinder (4) → finger contact (6). .

; The ringing process is completely opposite to the above-mentioned charging process.

The current path at the time of charging is a tower indicated by an arrow in the lower half of FIG. 2, and FIG. 8(b) shows this diagrammatically using a line current at rβ, which is the same as in the conventional example. In this figure, the repulsive force acting on the movable part in the input direction is represented by F2. Since this F2 is approximately the same value as the F2 of the conventional example shown in FIG. 3(a), according to the embodiment of the present invention shown in FIG. .

In addition, normally the increase in the cutoff gradient ν is correlated with the increase in the buffer Schilling diameter, resulting in an increase of 11 in Fig. 8(a), but in the case of a misfire l'l↓1, the current is equivalent to 11. This method is even more effective since there is no other route. Although the present invention has been described only with respect to an example in which the buffer cylinder is energized, it is of course also effective in an authoritative system having a contact for energization in the direction of the outer station of the buffer cylinder.
- [Effects of the Invention] According to the present invention, by arranging the bulge between the buffer cylinder and the t' operating rod, it is possible to reduce the repulsive force acting on the operating rod at the time of injection.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a conventional circuit breaker, with the upper half showing the completed closing state and the lower half showing the initial closing state. FIG. 2 is a cross-sectional view showing an embodiment of the present invention, in which the upper half shows the completion of charging H1j, and the lower half shows the initial state of charging. Figure 8 (a) is an explanatory diagram showing the current path in the lower half of Figure 1 as a line section, and Figure 3 (b) is a line diagram showing the current path in the lower half of Figure 2. FIG. In the figure, (3) is a fixed main contact, (4) is a buffer cylinder that also serves as a movable main contact, (7) is a piston,
(8) is the operating rod, (!υ is the movable arc contact,
((branches) are W and J constant arc contacts, and circles are ferrous tubes. The same reference numerals in each figure indicate the same or equivalent parts. 14 people, 4 tons.

Claims (1)

[Claims] (A movable arc contact and a fixed arc contact, which are integrally moved with the movable main contact and are moved by an operating rod, are arranged inside the fixed main contact and the movable main contact which are energized during steady state, A buffer cylinder that moves together with the movable arc contact and a piston that supports the operating rod spray compressed binding fluid when both the arc contacts are separated, wherein the papier cylinder and the operating rod are connected to each other. An insulating member is placed between the two arc contacts, so that when the two arc contacts are separated and the two arc contacts are in contact, a current flows through the two arc contacts, the operating rod, and the piston. (2) The circuit breaker according to claim 1, wherein the buffer cylinder also serves as a movable main contact.