KR200293134Y1 - Finger system of earthing switch - Google Patents

Abstract

The present invention relates to a finger system of a ground switch, and in a ground switch including a tank, a transmission line, a partition, a fixed contact, a finger system, a plate, a driver, and a floating contact, the floating contact is surrounded by the upper and lower contact points of the floating contact. A plurality of conductive fingers are formed in a circular shape and an inclined protrusion is formed at an upper end thereof and has a lower portion in contact with an upper portion of the fixing contact and a groove in a lower portion of the protrusion. A shielding film attached to the upper surface and opened to allow the flow contact to pass therethrough, a plurality of springs on the plate installed to correspond to the plurality of fingers to transmit contact force to the central axis of the fixed contact point, and the plurality of fingers. It includes a stop ring installed to fit in the groove formed in the upper portion. Accordingly, the plurality of fingers can prevent excessive heat generation due to breakage due to the contact of the floating contact or reduction of the contact area.

Description

Finger system of earthing switch

The present invention relates to a finger system of a grounding switch used in a gas insulated switchgear installed in indoor and outdoor substations.

Gas insulated switchgear is installed in substations indoors and outdoors, and is equipped with switchgear, ground breaker and circuit breaker in the tank filled with insulation gas such as colorless, tasteless and nontoxic SF6 with excellent insulation characteristics. It is composed of a main bus and protects the system by opening and closing the transmission line safely in abnormal conditions such as short circuit in case of an accident as well as opening and closing of the transmission line through which high voltage current flows in a normal state. In the above grounding, the insulation is maintained by a partition wall made of an insulator and an insulating gas such as SF6 to interrupt the current flow by a disconnector and a breaker for checking the transmission line made of a conductor, and then the current remaining in the transmission line Remove the current by grounding it or discharging it to a container.

1 is a cross-sectional view of a general grounding switch.

The ground switch is composed of a tank 11, a transmission line 13, a partition wall 15, a fixed contact 17, a finger system 19, a plate 21, a driver 23 and a floating contact 25. .

The tank 11 is made of aluminum or stainless steel and has a main portion 28 and a branch 29. The tank 11 is filled with an insulating gas such as SF6 having excellent insulating properties.

The transmission line 13 is a high-voltage current flowing and is formed of a metal with high conductivity such as aluminum or copper, and is installed in the main portion 28 of the tank 11.

The partition wall 15 is formed to block the entrance of the main portion 28 of the tank 11 to support the transmission line 13 so as not to come into contact with the inner wall of the tank 11, and further, the SF6 gas filled in the tank 11. To prevent leakage to the outside. The partition wall 15 is formed of an insulator such as epoxy resin to prevent current from flowing in the tank 11.

The fixed contact 17 is formed of a metal having high conductivity, such as aluminum or copper, branched to the transmission line 13 to face the branch 29 of the tank 11. The fixed contact 17 is formed so that the upper end protrudes.

Finger system 19 is formed of a high conductivity metal, such as copper or silver plated silver, and a plurality of fingers 31 are provided so that the lower part surrounds the upper part of the fixed contact 17, the finger ( 31 is installed to be connected to the fixed contact 17 without being separated by a spring 33 supported by the shielding film 35. The shielding film 35 has an opening 37 through which the flow contact 25 can pass.

The plate 21 is formed of a metal having high conductivity, such as aluminum or copper, and is installed to block the inlet of the branch 29 of the tank 11. The driver 23, the floating contact 25, and the discharge passage 27 are attached to the lower portion of the plate 21 and positioned in the branch 29 of the tank 11. In the above-described flow contact 25 is a metal having a high conductivity such as aluminum or copper, having a rod shape, and a lower end is rounded. The floating contact 25 is moved by the driver 23 and inserted into contact with the inner surfaces of the plurality of fingers 31 when the current remaining after the transmission line 13 is blocked or grounded. The discharge passage 27 is formed of a metal having high conductivity, such as aluminum or copper, and is installed to be in contact with the plate 21 and the floating contact 25.

The ground breaker having the above-described configuration interrupts the flow of current by a disconnector (not shown) and a breaker (not shown) for checking the transmission line 13 and the like. Then, the moving contact 25 is moved by the driver 23 to be inserted into contact with the inner surfaces of the plurality of fingers 31. Thus, an electric passage connected to the transmission line 13, the fixed contact 17, the plurality of fingers 31, the floating contact 25, the discharge passage 27 and the plate 21 is formed so that the transmission line 13 The residual current is removed by grounding or discharging at the surface of the tank 11. Insulating gas such as SF6 in the tank 11 prevents the arc of discharge from the transmission line 13.

2 is a cross-sectional view of a finger system according to the prior art.

The finger system according to the prior art consists of a plurality of fingers 31, a plurality of springs 33 and a shielding film 35.

The plurality of fingers 31 are formed of a metal having high conductivity, such as silver or copper plated silver, and are installed such that the lower portion surrounds the upper portion of the fixed contact 17. In the above, the plurality of fingers 31 are provided with grooves in contact with the protrusions formed on the lower fixed contact 17. Then, the plurality of fingers 31 is formed with a protrusion having an inclination at the upper end.

The shielding film 35 surrounds a plurality of fingers 31, the lower part of which is attached to the fixed contact point 17, and the upper part of the shielding layer 35 to which the floating contact point 25 passes.

The plurality of springs 33 are formed in a plate shape and are fixed to and supported by the shielding film 35. The plurality of springs 33 are installed to correspond to the plurality of fingers 31, respectively, and transmit a contact force. Therefore, the plurality of fingers 31 are circular to the center without being separated from the fixed contact 17 by the plurality of springs 33.

The above-described finger system cuts off the transmission line 13 and engages and contacts the floating contact 25 to allow the current remaining in the transmission line 13 or the excited current to flow through the ground or the surface of the tank 11. Discharge. That is, the floating contact 25 is moved between the plurality of fingers 31 forming a circle by the driver 23 so as to be in contact with and electrically connected to the floating contact 25 and the plurality of fingers 31. Therefore, the current of the transmission line 13 can be removed. Since a protrusion having an inclination is formed at the upper ends of the plurality of fingers 31, it is easy to insert the floating contact 25.

However, in the conventional finger system described above, the components on the eccentric side are subjected to excessive load by the spring and the opposite side when the eccentricity of the moving contact does not coincide with the central axis due to machining tolerances and assembly tolerances. Since the finger is not in contact with the floating contact point, there was a problem that excessive heat was generated due to breakage or reduction of the contact area.

Accordingly, an object of the present invention is to provide a finger system that can reduce the occurrence of breakage or heat by making the contact area between the finger and the floating contact constant.

Finger system according to the present invention for achieving the above object is a ground switchgear consisting of a tank, a transmission line, a partition, a fixed contact, a finger system, a plate, a driver and a floating contact, the fixed contact is surrounded by the upper and lower contact A plurality of conductive fingers are formed in a circular shape in which a flow contact is inserted and has an inclined protrusion at an upper end thereof, the conductive fingers having grooves in a lower portion and a lower portion in contact with an upper portion of the fixed contact, and surrounding the plurality of fingers. A shielding membrane attached to the fixed contact point and opened at the upper portion thereof so as to pass through the flow contact point, a plurality of springs on the plate installed to correspond to the plurality of fingers to transmit contact force to the central axis of the fixed contact point, and the plurality of It includes a stop ring installed to fit in the groove formed on the top of the four fingers.

1 is a cross-sectional view of a general grounding switch.

2 is a cross-sectional view of a finger system according to the prior art.

Figure 3 is a cross-sectional view of the finger system according to the present invention.

Explanation of symbols on the main parts of the drawings

41: finger 43: spring

45: guide ring 47: stop ring

49: shielding film 51: opening

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of a finger system according to the present invention.

The finger system according to the present invention consists of a plurality of fingers 41, a plurality of springs 43, a shielding film 49, a guide ring 45 and a stop ring 47.

The plurality of fingers 41 are formed of a metal having high conductivity, such as plating silver on copper or copper, and are installed such that the lower portion surrounds the upper portion of the fixed contact 17. In the above, the plurality of fingers 41 are formed in contact with the protrusion formed on the upper portion of the fixed contact 17 and the groove is formed in the upper portion. And, the plurality of fingers 41 is formed with a protrusion having an inclination at the upper end.

The shielding film 49 surrounds the plurality of fingers 41, the lower portion of which is attached to the upper portion of the fixed contact point 17, and the upper portion of the shielding layer 49 is formed so that the floating contact point 25 may pass therethrough. In the above, the shielding film 49 is formed of a conductive metal such as aluminum or copper to absorb the high voltage current by the arc discharge and flow back to the fixed contact 17.

A plurality of springs 43 are formed in a plate shape and corresponding to each of the plurality of fingers 41, the guide ring 45 is formed to surround the outside of the central portion of the spring (43). By the guide ring 45, the spring 43 transmits a contact force to push the corresponding finger 41 to the central axis of the fixed contact point 17 to form a circle. Therefore, the plurality of fingers 41 are circular to the center without being separated from the fixed contact 17 by the plurality of springs 43. Since the plurality of springs 43 on the plate is not fixed to the shielding film 49 and is wrapped in the guide ring 45 to fix the plurality of fingers 41, the fixed contact 17 flows due to machining and assembly tolerances. Although not coincident with the central axis of the contact 25, the plurality of fingers 41 are in contact with the fixed contact 17 under uniform pressure. Therefore, the plurality of fingers 41 are prevented from generating excessive heat due to breakage or reduction of the contact area.

The stop ring 47 is installed to fit in a groove formed on the plurality of fingers 41. Therefore, the stop ring 47 allows the plurality of springs 43 and the guide ring 45 to form an exact circle while preventing the plurality of fingers 41 from being severely pushed to the central axis of the fixed contact 17. Therefore, it is possible to prevent the diameter of a circle formed on the plurality of fingers 41 from being much smaller than the diameter of the flow contact 25 to facilitate the insertion of the flow contact 25.

The finger system of the above-described configuration is fixed so that a plurality of fingers 41 are not fixed to the shielding film 49 but have a circular diameter by a plurality of plate-like springs 43 wrapped around the guide ring 45 and have a circular diameter. A stop ring 47 is provided therein, which is formed by a plurality of fingers 41 to discharge the current remaining through the fixed contact 17 or the excited current through the ground or the surface of the tank 11. When the floating contact 25 is inserted into the circular diameter, the plurality of fingers 41 are fixed contact 17 even though the fixed contact 17 does not coincide with the central axis of the floating contact 25 due to machining and assembly tolerances. Under uniform pressure.

Therefore, the present invention has an advantage that a plurality of fingers can be prevented from generating excessive heat due to breakage due to contact of the floating contact or reduction of the contact area.

Claims (1)

In the grounding switch composed of tank, transmission line, bulkhead, fixed contact, finger system, plate, driver and floating contact, A plurality of conductive fingers having a groove formed in the lower part and the lower part of the protrusion contacting the fixed contact part so as to form a circular shape in which the floating contact is inserted and the inclined protrusion is formed at an upper end thereof. Wow, A shielding film surrounding the plurality of fingers, the lower portion of which is attached to the fixed contact point, and the upper part of which is opened to allow the flow contact point to pass therethrough; A plurality of springs on the plate installed to correspond to the plurality of fingers to transmit contact force to the central axis of the fixed contact point; And a stop ring installed to fit in a groove formed on the plurality of fingers.