KR20130051791A - Improved hybrid operating rod of circuit breaker - Google Patents

Abstract

PURPOSE: A breaker which has a hybrid-type actuating rod is provided to perform an arc soho operation rapidly and accurately by using the compressed gas which flows backward to the inside of a ventilation load in the low current breakable operation status. CONSTITUTION: A pupper cylinder(6) performs the gas compression(P1) through a fixing main contact(1), a driving main contact(2), a fixed arc contact(3), a movable arc contact(4) and a piston(5). A ventilation load(7) guides a reciprocating linear motion of the piston. The ventilation load forms a first and a second exhaust hole(21,22) in the upper and lower side with a constant interval. An actuating rod(30) and an elastic member(40) which have a first and a second guide hole(31,32) are arranged inside the ventilation load. The elastic member is comprised to push the actuating rod up to the fixed arc contact direction.

Description

HybridImproved hybrid operating rod of circuit breaker

The present invention relates to a circuit breaker (circuit breaker), and more particularly to a breaker having a hybrid type of operating rod to compensate for the shortcomings in the popper arc method to achieve a small current breaking operation of several thousand amps or less.

When a failure occurs in the power system, in order to protect the power system and various power devices, a fault current must be cut off, and a breaker is performed to block the fault current.

That is, although the circuit breaker is not shown in the drawings, gas compression is generally performed by the action of a fixed main contact, a movable main contact, a fixed arc contact, and a movable arc contact for energizing a normal current and blocking a fault current. A wrapper cylinder, an exhaust rod that guides the reciprocating linear movement of the piston, a nozzle which is provided on one side of the popper cylinder and guides contact and separation of the fixed arc contact and the movable arc contact, and wraps and protects each of the above components. It is basically provided with a tank filled with insulating gas (SF6), in addition to the connection rod for transmitting the power for moving the movable portion to increase the blocking performance of the gas shut-off portion, and the manipulator for providing power for the movement of the movable portion It was.

However, the conventional circuit breaker extinguishes the arc with gas compressed by the piston in the papillar by mechanical operation, and for this arcing operation, the pressure in the papillary chamber must be higher than the pressure in the working rod. When the gas to be expanded flows back into the exhaust rod to increase the pressure in the working rod, and thus the pressure in the exhaust rod is higher than the pressure in the papper chamber, arc extinguishing at the time of breaking the small current cannot be expected.

Therefore, the present invention is to improve the conventional problems as described above, if the pressure in the pap cylinder (paper chamber) is higher than the pressure in the exhaust rod to arc arc extinguishment in the popper method, the pressure in the pap cylinder back flow The purpose of the present invention is to provide a circuit breaker having a hybrid operating rod that allows arc arcing at the time of breaking a small current by using the compressed gas flowing back into the exhaust rod when the compressed gas is lower than the pressure in the exhaust rod. It is.

Breaker having a hybrid operating rod of the present invention for achieving the above object, by the operation of the fixed main contact, the movable main contact, the fixed arc contact and the movable arc contact and the action of the piston so that the energization of the normal current and the interruption of the fault current is achieved. And a exhaust cylinder that guides the reciprocating linear movement of the piston, wherein the exhaust rods comprise first and second exhaust holes at upper and lower sides with a predetermined interval. The second exhaust hole is opened inside the exhaust rod to allow arc extinguishing when a small current is interrupted by the gas compressed in the pap cylinder by the action of the piston, and when a reverse flow of the compressed gas flows into the exhaust rod. To guide this in the pap cylinder to guide arc arcing through the backflow compressed gas and the compressed gas in the pap cylinder. An actuating member for moving the rod and the actuating rod is compressed by the compressed gas flowing back into the exhaust rod, and is elastically extended to push up the actuating rod when there is no backflow of the compressed gas into the exhaust rod. Combining configuration.

In addition, the operating rod does not have a backflow of compressed gas into the exhaust rod, and when the pressure in the exhaust rod is lower than the elastic pressure of the elastic member, the first exhaust hole is blocked and compressed into the exhaust rod. When the pressure in the exhaust rod is higher than the elastic pressure of the elastic member due to the reverse flow of gas, the first guide hole is opened to partially open the first exhaust hole to guide a part of the counter flowed compressed gas into the pap cylinder. And the second exhaust hole is partially opened when the pressure in the exhaust rod is lower than the elastic pressure of the elastic member because there is no back flow of compressed gas into the exhaust rod. When the pressure in the exhaust rod is higher than the elastic pressure of the elastic member due to backflow, the second exhaust hole is completely opened. To, to form a second guide hole to evacuate the part of the compressed gas which is the reverse flow at the lower side.

Thus, in the present invention, when the pressure in the popper cylinder is higher than the pressure in the working rod, arc arcing is made in the popper method, but the pressure in the popper cylinder is lower than the pressure in the exhaust rod by the backflow of compressed gas. In this case, arc extinguishing is performed when the small current is interrupted by using the compressed gas flowing back into the exhaust rod. This makes the arc extinguishing effect quickly and accurately in the small current interruption operation state of the breaker. You can expect it.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of a state in which a circuit breaker performs arc extinguishing at a pressure in a pap cylinder (a pap chamber) according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of an arc extinguishing operation at a pressure in a pap cylinder (paper chamber) containing a compressed gas backflowed by a breaker according to an embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a cross-sectional view of a circuit breaker in an arc extinguishing operation at a pressure in a pap cylinder according to an embodiment of the present invention, and FIG. The sectional drawing of the state which arc arcing-operates by the pressure in a (paper chamber) is shown.

The circuit breaker having a hybrid operating rod according to an exemplary embodiment of the present invention has a fixed main contact point 1 and a movable main contact point 2 such that energization of a normal current and interruption of a fault current are performed as shown in FIGS. 1 and 2. ), The fixed arc contact (3) and the movable arc contact (4), the reciprocating of the cylinder (Paper seal) (6) and the piston (5) in which gas compression (P ₁ ) is performed by the action of the piston (5) In constructing a circuit breaker including an exhaust rod 7 for guiding a linear movement, the exhaust rod 7 is formed with first and second exhaust holes 21 and 22 spaced apart from each other at a predetermined interval up and down. In the, the exhaust rod (7) is composed of the operating rod 30 and the elastic member 40 having the first and second guide holes 31 and 32 in the interior.

The actuating rod 30 opens the second exhaust hole 22 so that arc extinguishing at the time of interruption of small current with gas compressed in the pap cylinder 6 by the action of the piston 5 is achieved. When the reverse flow of the compressed gas to the inside of the exhaust rod (7) guides it to the pap cylinder (6), it slides to guide arc arc through the back flow of compressed gas and the compressed gas in the pap cylinder (6). .

At this time, the first guide hole 31 formed at the upper side of the operation rod 30 has no back flow of compressed gas into the exhaust rod 7 so that the pressure P _{2 in} the exhaust rod 7 is increased. When it is lower than the elastic pressure P ₀ of the elastic member 40 (P ₂ ≤ P ₀ ), the first exhaust hole 21 is blocked, but a reverse flow of compressed gas into the exhaust rod 7 occurs. When the pressure P ₂ in the exhaust rod 7 is higher than the elastic pressure P ₀ of the elastic member 40 (P ₂ ≥ P ₀ ), the first exhaust hole 21 is partially opened. It is configured to guide a part of the back flow compressed gas to the papper chamber (P) maintaining a constant pressure (P ₂ ).

In addition, the second guide hole 32 formed at the lower side of the operating rod 30 has no back flow of compressed gas into the exhaust rod 7 so that the pressure P _{2 in} the exhaust rod 7 is increased. When lower than the elastic pressure P ₀ of the elastic member 40 (P ₂ ≤ P ₀ ), the second exhaust hole 22 is partially opened, but the backflow of the compressed gas into the exhaust rod 7 is reversed _. When the pressure P ₂ in the exhaust rod 7 is higher than the elastic pressure P ₀ of the elastic member 40 due to the occurrence (P ₂ ≥ P ₀ ), the second exhaust hole 22 is completely opened. It is configured to exhaust a part of the compressed gas flowing back.

The elastic member 40 is compressed when the operation rod 30 slides by the compressed gas flowing back into the exhaust rod 7, and the reverse flow of the compressed gas into the exhaust rod 7 When the pressure P _{2 in} the exhaust rod 7 due to the absent or reversed gas is lower than the retained elastic pressure P ₀ , the operating rod 30 is extended in the direction of the fixed arc contact 2. It is configured to push up.

That is, the circuit breaker according to the embodiment of the present invention, as shown in Figure 1 attached first, when the energization of the normal current and the interruption of the fault current is made while the power is supplied to the movable portion by the manipulator, the piston (6) ) Moves linearly along the exhaust rod 7 while the gas in the pap cylinder 6 is compressed and its pressure P ₁ is increased, and the fixed main contact ₁ is released from the gas pressure P _{1 in} the pap cylinder 6. ) And the movable main contact (2), and arcing which occurs when the fixed arc contact (3) and the movable arc contact (4) are separated.

At this time, the pressure P _{1 in} the popper cylinder 6 is higher than the pressure P _{2 in} the exhaust rod 7 for guiding the linear movement of the piston 7 (P ₁ ≥ P ₂ ) and accordingly the exhaust The first guide hole 31 formed in the upper side of the operating rod 30 located in the rod 7 is blocked without communicating the first exhaust hole 21 formed in the upper side of the exhaust rod 7, The second guide hole 32 formed at the lower side of the actuating rod 30 opens only a part of the second exhaust hole 22 formed at the lower side of the exhaust rod 7.

On the other hand, when arc extinguishment is made from the gas pressure P ₁ compressed in the puffer cylinder 6, if the compressed gas used in the arc extinguishing flows back into the exhaust rod 7, the counter flow the pressure in by the compressed gas (7) the exhaust load (P ₂₎ is the pressure (P ₂₎ in this case higher than the pressure (P ₁₎ in the Popper cylinders _{(6) (P 1 ≤P 2} ), increasing the The operating rod 30 slides downward while overcoming the elastic pressure P ₀ of the elastic member 40.

Then, the first guide hole 31 formed in the upper side of the operating rod 30 opens a part of the first exhaust hole 21 formed in the upper side of the exhaust rod 7, and the operating rod 30 The second guide hole 32 formed at the lower side of the) opens the entire second exhaust hole 22 formed at the lower side of the exhaust rod 7.

At this time, a part of the compressed gas flowed back into the exhaust rod 7 from the partial opening of the first exhaust hole 21 is guided to the pap cylinder 6, and the pressure P in the pap cylinder 6 is maintained. ₁ ) becomes higher again, and becomes higher than the pressure P _{2 in} the exhaust rod 7. Accordingly, the fixed main contact 1 and the movable main contact (1) are released from the gas pressure P _{1 in} the pap cylinder 6. 2) and arc extinguishing occurs when the fixed arc contact 3 and the movable arc contact 4 are separated.

In the above description, the technical concept of the MCT block assembly automatic generation device of the present invention has been described together with the accompanying drawings, but this is only illustrative of the best embodiment of the present invention and not intended to limit the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that such changes and modifications are within the scope of the claims.

One ; Fixed main contact point 2; Operation main contact
3; Fixed arc contact 4; Movable Arc Contact
5; Piston 6; Popper cylinder
7; Exhaust rods 21,22; 1st and 2nd exhaust hole
30; Working rod 31,32; 1st and 2nd guide hole
40; Elastic member

Claims (2)

A breaker including a fixed main contact, a movable main contact, a fixed arc contact and a movable arc contact, a pap cylinder (gas chamber) in which gas is compressed by the action of the piston, and an exhaust rod for guiding the reciprocating linear movement of the piston. In that,
First and second exhaust holes are formed on the exhaust rod at upper and lower sides with a predetermined interval,
Inside the exhaust rod,
The second exhaust hole is opened to allow arc extinguishing when a small current is interrupted by the gas compressed in the pap cylinder by the action of the piston, and guides the pap cylinder to the pap cylinder when a reverse flow of compressed gas occurs into the exhaust rod. An actuating rod that slides to guide arc extinguishing through the countercurrent compressed gas and the compressed gas in the pap cylinder;
The operation rod is compressed when the slide movement by the compressed gas flowing back into the exhaust rod, when there is no back flow of the compressed gas into the exhaust rod is characterized in that it comprises an elastic member coupled to push up the operating rod Breaker with hybrid actuation rod. The method of claim 1, wherein the operating rod,
When there is no back flow of compressed gas into the exhaust rod and the pressure in the exhaust rod is lower than the elastic pressure of the elastic member, the first exhaust hole is blocked, and the back flow of the compressed gas into the exhaust rod causes When the pressure in the exhaust rod is higher than the elastic pressure of the elastic member, a part of the first exhaust hole is opened to form a first guide hole for guiding a part of the backflow compressed gas to the pap cylinder,
When there is no reverse flow of compressed gas into the exhaust rod and the pressure in the exhaust rod is lower than the elastic pressure of the elastic member, the second exhaust hole is partially opened, and the reverse flow of compressed gas into the exhaust rod is caused. When the pressure in the exhaust rod is higher than the elastic pressure of the elastic member, the second exhaust hole is completely opened, so that a second guide hole for exhausting a part of the back flow of compressed gas is formed below. Circuit breaker with working rod.

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