KR-20260062582-A - CIRCUIT BREAKER

KR20260062582AKR 20260062582 AKR20260062582 AKR 20260062582AKR-20260062582-A

Abstract

The present invention relates to a circuit breaker, and may further comprise: a fixed part including a fixed housing formed of an outer fixed housing and an inner fixed housing, wherein a fixed arc contact is provided and an exhaust passage for discharging high-temperature gas is formed on the inner side; a movable part having a cylinder part connected to a cylinder rod that receives driving force from a movable rod inside, wherein the cylinder part reciprocates back and forth and is electrically connected to and disconnected from the fixed part and selectively contacts the fixed arc contact, and an exhaust passage for discharging high-temperature gas is formed on the inner side; and a guide vane part provided in the exhaust passage of each of the fixed part and the movable part to guide metal vapor or exhaust gas in a predetermined shape or direction. The present invention provides that when a circuit breaker discharges hot gas generated during the process of interrupting a fault current to the outside, the length of the flow path is increased by a flow path guide, and the increased length of the flow path provides more cooling time, thereby allowing the discharged hot gas to be cooled more easily. Furthermore, the present invention has the effect of preventing ground fault interruption failure in advance because metal vapor contained in the discharged hot gas is filtered by a movement restriction part or a collection container part as it moves along the flow of the hot gas.

Inventors

유정현
송태헌

Assignees

에이치디현대일렉트릭 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (13)

A fixed part comprising a fixed housing having a fixed arc contact, the fixed housing being composed of an outer fixed housing and an inner fixed housing, and having a discharge channel formed on the inner side for discharging high-temperature gas; A movable part having a cylinder portion connected to a cylinder rod that receives driving force from a movable rod inside, a movable arc contact provided that reciprocates back and forth and is electrically connected to and disconnected from the fixed part and selectively contacts the fixed arc contact, and an exhaust passage formed inside for discharging high-temperature gas; and A guide vane provided in the discharge passage of each of the fixed and movable parts to guide metal vapor or exhaust gas in a predetermined shape or direction; A circuit breaker that further includes.
In paragraph 1, A flow path guide portion that extends or is connected along the longitudinal direction of the fixed arc contact from one side of the inner fixed housing, or extends or is connected along the longitudinal direction of the cylinder rod from the cylinder, and extends the length of the discharge path through which the expanded high-temperature gas is discharged; A circuit breaker that further includes.
In paragraph 2, The above-mentioned movable part is, A rod support member that forms a through hole through which the cylinder rod passes and supports the cylinder rod by contacting the outer surface of the cylinder rod; Includes, The above-mentioned guide wing portion is a circuit breaker installed on the surface facing the above-mentioned flow guide portion of the above-mentioned rod support portion.
In paragraph 2, The above fixed part is, A fixed support member that fixes and supports the fixed arc contact around the fixed arc contact; Includes, The above-mentioned guide wing portion is a circuit breaker installed on the surface of the above-mentioned fixed support member facing the above-mentioned flow guide portion.
In paragraph 1, A circuit breaker in which the above-mentioned guide vane is formed so that metal vapor or exhaust gas passing through the above-mentioned guide vane rolls and obtains centrifugal force.
In paragraph 3, The above-mentioned guide wing section is, A wing formed obliquely along the longitudinal direction of the cylinder rod on the cylinder rod or the rod support, with the cylinder rod as the central axis; A circuit breaker that further includes.
In paragraph 4, The above-mentioned guide wing section is, A wing formed obliquely along the longitudinal direction of the fixed arc contact on the outer side of the fixed arc contact or on the outer side of the fixed support member, with the fixed arc contact as the central axis; A circuit breaker that further includes.
In paragraph 6 or 7, The above-mentioned guide wing section is, A first wing obliquely provided along the longitudinal direction of the central axis on the outer side of the central axis; and A second wing provided obliquely along the longitudinal direction of the central axis on the outer side of the central axis and connected to the first wing; A circuit breaker that further includes.
In paragraph 2, A movement restriction part provided in the above Euro guide part and restricting the movement of metal powder or metal residue contained in metal vapor or exhaust gas in which centrifugal force is formed by passing through the above guide wing part; A circuit breaker that further includes.
In Paragraph 9, The above movement limiting part is a circuit breaker in which the cross-section along the longitudinal direction of the above Euro guide part is formed as irregularities.
In Paragraph 9, The above movement limiting part is a blocker in which the cross-section formed along the longitudinal direction of the above Euro guide part is formed as a polygon or at least one side is formed as a curved surface.
In Paragraph 9, The above movement limiting part is a blocker provided in a donut shape on the inner surface of the above Euro guide part.
In paragraph 2, A collection container portion provided in the above-mentioned Euro guide portion in the shape of a container open in the opposite direction of the Euro, and collecting metal powder or metal residue contained in metal vapor or exhaust gas in which centrifugal force is formed by passing through the above-mentioned guide wing portion; A circuit breaker that further includes.

Description

Circuit Breaker The present invention relates to a circuit breaker, and more specifically, to a composite arc-extinguishing or puffer-type circuit breaker. Generally, circuit breakers are used to interrupt fault currents and protect power equipment in the event of a fault in a power system. The operating principle and device configuration for extinguishing an arc generated by a fault current between two electrical contacts in a conventional ultra-high voltage circuit breaker are explained as follows. Basically, when an arc caused by a fault current occurs while the insulating gas is filled into the circuit breaker at high pressure, the insulating gas is compressed to a very high pressure and forcefully sprayed directly onto the arc to extinguish it. Ultra-high voltage circuit breakers are broadly classified into Puffer Type and Hybrid Type depending on the method of extinguishing the arc, and gas circuit breakers of the Hybrid Type are typically configured to include two chambers, such as a Compress Chamber and a Thermal Chamber. In a composite arc-extinguishing circuit breaker of this configuration, when a fault occurs in the power system, the movable part moves around the fixed part, and during the movement of the movable part, the gas in the compression chamber is automatically compressed by a fixed-position piston. In addition, as the movable part moves, the fixed arc contact and the movable arc contact separate, and an arc is generated between the two arc contacts. At this time, if the gas pressure in the compression chamber is higher than the gas pressure in the thermal expansion chamber, the check valve provided on the middle plate opens, and the gas compressed in the compression chamber is injected between the fixed arc contact and the movable arc contact through the thermal expansion chamber and the main nozzle. Accordingly, the fault current can be interrupted as the arc generated between the two arc contacts is extinguished by the compressed gas in the compression chamber. At this time, as the arc temperature reaches tens of thousands of degrees, the gas surrounding the arc expands due to the high temperature and flows back into the thermal expansion chamber; when the pressure in the thermal expansion chamber becomes higher than that in the compression chamber due to the backflowing gas, the check valve closes. The gas that flows back into the thermal expansion chamber mixes with the cold gas in the thermal expansion chamber, and the cooled gas is injected into the arc between the fixed arc contact and the movable arc contact to extinguish the arc. During this process, if the pressure in the compression chamber is high, mechanical pressure may be applied to the circuit breaker itself; therefore, when the pressure in the compression chamber exceeds a certain level, the pressure reducing valve of the piston opens to expel the gas from the compression chamber to the rear, thereby regulating the pressure in the compression chamber. In other words, when the magnitude of the fault current is small, the arc is extinguished by the compressed gas in the compression chamber to interrupt the fault current; however, when the fault current is large, the arc energy generated between the fixed arc contact and the movable arc contact is used to expand the surrounding gas and cause it to flow back into the thermal expansion chamber. Then, the gas that has been cooled and compressed in the thermal expansion chamber is injected again to extinguish the arc and interrupt the fault current. Meanwhile, in the case of a general power system, since it is alternating current, there is a point where the current becomes “0”, and at this time, the gas that was filled at high pressure in the thermal expansion chamber (10) is injected between the fixed arc contact and the movable arc contact to extinguish the arc. With this, insulation performance is restored, and it is said that the blockage was successful. Ultimately, during the process where the circuit breaker interrupts the fault current, the temperature of the insulating gas rises due to arc energy, and the arc contacts are fused, generating metal vapor. The hot gas and metal vapor generated as a result are discharged outside the circuit breaker along the gas flow, but if the hot gas does not cool sufficiently or the amount of metal vapor increases, there is a problem that ground fault interruption failure occurs. Figure 1 is a schematic cross-sectional view of a conventional circuit breaker. FIG. 2 is a cross-sectional view schematically showing a circuit breaker according to an embodiment of the present invention. FIG. 3 is a schematic perspective view showing the induction wing portion of a circuit breaker according to an embodiment of the present invention. Figures 4 (a) and (b) are schematic perspective views of other embodiments of Figure 3. FIG. 5 is a schematic diagram showing a movement limiting part installed on a fixed part of a circuit breaker according to an