KR20030085350A - Gas Insulated Switchgear - Google Patents

Abstract

PURPOSE: A gas insulated switchgear for switching automatically a gas insulating failure block is provided to connect or disconnect a fixing terminal to or from a movable terminal by using a rotary method. CONSTITUTION: A gas insulated switchgear for switching automatically a gas insulating failure block includes a grounding switch, a main body, and a tank including SF6 gas. The gas insulated switchgear further includes a rotary terminal portion(40), a fixing terminal(30), and a casing(50). The rotary terminal portion(40) is covered by the casing(50) within the tank. A rotary terminal portion(40) is rotated by the rotary power of an operating handle. The rotary terminal portion(40) is separated from the fixing terminal(30) when the rotary terminal portion(40) is rotated by the rotary power of an operating handle.

Description

Gas Insulated Switchgear Automatic Switch {Gas Insulated Switchgear}

The present invention relates to a gas insulated failure section automatic switch, and in particular, to cut off the electricity flowing through the high-voltage distribution line to facilitate the construction of renovation, and to operate the fixed terminal of the switch to cut off the electricity supplied to a specific area in the event of an accident By changing the terminal from the slide type to the rotary method, the volume of the switch is reduced to simplify the manufacturing, transportation and installation work, thereby increasing the efficiency, and the movable terminal connected to the fixed terminal is separated from the fixed terminal and separated at the same time. By allowing sulfur hexafluoride gas to flow rapidly between the terminals on both sides, the arc of high temperature generated is quickly extinguished to prevent the terminal from melting and breaking due to deterioration, thereby enabling long-term use.

In general, the most effective form for supervisory control and maintenance security through wiring by mounting or accommodating any or a plurality of supervisory control (meters, relays, regulators, etc.) and main circuit equipment (breakers, disconnectors, etc.) to the structure (open or closed). These devices are called switchboards. These switchboards are needed for all parts of the power supply, from power generation, transmission and substation to power reception, distribution and motor control. There are many different types of innovation, including innovation.

Korea's power distribution system is a three-phase, four-wire multi-ground system, and in case of ground fault, ground fault current flowing in the neutral line may be larger than short circuit current, and ground fault is installed in circuit breaker and distribution line of substation. In order to prevent the expansion of the fault and minimize the damage by only quick and accurate break or open only the fault section, in the substation system, an automatic breaker is installed at the branch point of the load capacity less than 4000 [kVA] or at the customer entrance. have.

This fault zone automatic switch is to cut the load of underground line distribution system. The three-phase single operation tank type is provided with a switch body and a control box and an enclosure that can open, close, and ground inside the tank. The main body is provided with a ground switch that slides for each circuit, and is provided to easily check the operation state of the ground switch from the outside.

In addition, each part of the switch is sufficiently resistant to mechanical stress during operation and an electromagnetic force at the time of short-circuit, and does not open and close by itself due to gravity, vibration, etc., and is provided such that there is no part where water can collect in the switch.

In addition, the safety of the human body is sufficiently secured when approaching or operating the switch, and the structure of the switch can be easily identified.

And the inside of the tank is filled with SF6 (sulfur hexafluoride) gas, which is a colorless tasteless, odorless and non-toxic inert high insulation gas, providing insulation and arc extinguishing ability to prevent deterioration.

However, the automatic switch having such a structure has a problem in that its structure is increased when the grounding switch in the switch body is slidably moved and connected to the interruption when the automatic switch is operated using an operation tool provided on one side of the control box.

In addition, in order to fully exhibit the extinguishing capacity during crackdown, the concentration of sulfur fluoride gas around the ground switch should be barked compared to other places, but the sulfur fluoride gas is uniformly filled in the tank, so that the insulation and arc extinguishing ability is lowered. There was a problem that deterioration occurred.

The present invention has been made to solve such a problem, by reducing the volume of the body of the switch body by replacing the fixed terminal and the movable terminal, which is the connection terminal of the switch installed in the branch or submerged inlet of the substation system from the slide method to the rotary method. Simplify the manufacturing, transportation and installation work to increase the efficiency, and also by allowing sulfur hexafluoride gas to flow rapidly between the terminals on both sides separated from the outside while the movable terminal is separated from the fixed terminal. It is an object of the present invention to provide a gas insulated failure section automatic switch that can be used for a long time by preventing arcs from being melted and damaged due to deterioration by quickly extinguishing high-temperature arcs.

In order to achieve the above object, the present invention provides a gas insulated failure section automatic switch provided in a tank filled with a sulfur hexafluoride gas which is an inert high insulation gas. In the rotational force of the operation handle through the mechanism to the inside of the tank filled with sulfur hexafluoride gas is rotated by rotating the rotating terminal portion to be disconnected from the fixed terminal provided on the inner periphery, and at the same time to rotate the fixed terminal The object is achieved by providing a gas insulated fault zone automatic switchgear, characterized in that the arc generated between the terminals is configured to be extinguished by sulfur fluoride gas flowing into the casing.

1 is a perspective view of an automatic switch according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

4 is a sectional view showing the principal parts of the enlarged portion A of FIG. 3.

5A and 5B are cross-sectional views taken along the line C-C in FIG. 3, showing an operating state in which the rotation terminal is short-circuited.

6A and 6B are cross-sectional views taken along the line D-D of FIG. 3, and illustrates an operation state in which gas flows between the fixed terminal and the rotary terminal during the short circuit of the rotary terminal.

Figure 7 is an exploded perspective view showing the inside of the casing of another automatic switch according to the present invention.

<Brief description of symbols for the main parts of the drawings>

10: tank 22: mechanism

24: Operation handle 30: Fixed terminal

40: rotary terminal portion 42: tube member

42a: insertion hole 44: shaft

44a: Split pin 46a: Spacer

46b: connection member 46c: pin

48: blade 50: casing

52, 52a: bulkhead 54, 54a: space part

58,58a: Gas Inflow Guide

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

As shown in FIGS. 1 to 4, the gas insulation breakdown section automatic switch 100 according to the present invention has a connection member 12 and 14 for connecting and connecting a plurality of inlet and outlet cables, the outside of which is not shown. Is provided on the upper portion of the tank 10 filled with hexafluorofluoride gas, the operation state and position of the mechanism 22 is displayed on the front surface of the tank 10 with the mechanism 22 built-in, and also Consists of a control box 20 provided with an operation handle 24 to operate.

In addition, the tank 10 has a casing 50 having a plurality of fixed terminals 30 and the rotating terminal 40 in the horizontal direction, and is provided with a rotating terminal rotatably provided in the center of the casing 50. 40 is provided to be mechanically connected to the output side of the mechanism 22, one side of the rotary terminal 40 is configured to be connected to the connection position indicator 26 provided on the front of the control box 20 to be described later do.

Here, the tank 10 is provided to maintain the airtight while a predetermined space is provided therein, the upper portion of the tank 10 secures a proper distance from the neighboring cable in the process of connecting a plurality of incoming cable and the outgoing cable It is provided in a way to open to both sides with respect to the center as a way to.

In addition, the lower portion of the tank 10 is provided with an injection hole or inspection hole 16 to facilitate the inspection and replacement of the sulfur hexafluoride gas into the tank or the terminals provided therein.

The control box 20 is fixed to the front or one side of the tank 10 as a fastening means, while foreign matters, etc. from the outside while the plurality of mechanisms 22 provided therein are prevented from being exposed to the outside. To prevent corrosion by rain or rain, it is provided for smooth and easy operation.

In addition, an operation handle 24 is provided on one side of the front side of the control box 20, but the operation handle 24 may operate the mechanism 22 provided in the control box 20 through manual operation. It is provided at both sides by the open handle 24a and the close handle 24b.

In addition, the front surface is provided with a counter 27, a connection position indicator 26, and a pressure indicator 28 for displaying the internal pressure, so that the information inside the tank 10 and the control box 20 can be seen from the outside. It is provided.

The casing 50 is fixed to one inside by using a fastening member that is separated into two of the inner space is provided with a cylindrical space, the rotation terminal in the center is rotatably provided, as shown in Figure 7 A case body 56 provided with a plurality of separate spaces 54 and 54a by a plurality of partitions 52 and 52a having a semicircular shape, and an inner circumferential side of the spaces 54 and 54a. The two are provided in pairs in a separated state with the fixed terminals 30 inserted and fixed through the inside and the outside.

In addition, the gas inflow guides 58 and 58a having a form of being expanded are integrally formed on one side of the inner circumferential portion where the fixed terminal 30 is formed while the pair is formed of two pairs.

As shown in FIG. 4, the rotary terminal portion 40 has a hollow tube member 42 having a length corresponding to the length of the case body 56, and a mechanism at one end of the tube member 42. 22, a plurality of rotary terminals 46 inserted into the shaft 44 provided to be connected to the output side of the tube member 42, the insertion hole 42a formed in the tube member 42 to be described later, the tube member 42 and the rotary terminal ( 40 is provided between the blades 48 are provided to quickly introduce the sulfur hexafluoride gas into the space portion of the case body 56.

Here, the tube member 42 is formed of an insulator to prevent electricity from flowing between the plurality of rotary terminals 40, the insertion hole 42a having the same shape at a predetermined position is formed to pass through have. The tube member 42 is more preferably formed of FRP material.

The shaft 44 connected to one end of the tube member 42 has a split pin 44a having an end portion of the shaft 44 inserted into the tube member 42 to prevent the shaft 44 from being separated from the shaft 44. It is provided to be fixed using.

The rotary terminal 46 is fixed to the tube member 42 rotatably provided in the center of the case body 56, is provided to enable reciprocating movement in a predetermined angle in both directions, the fixed terminal 30 It is formed to abut on both sides of the).

The rotation terminal 40 is a pin 46c and a fixing means 46c having a pin 46c and a connecting member 46b connected to both sides of the fixed terminal 30 on both sides of the spacer 46a having a predetermined thickness. -1), the free end of the connecting member 46b is formed to protrude to a predetermined length than the free end of the spacer 46a, and is provided to be connected to both sides of the fixed terminal 30.

Due to the pressure generated while the blade 48 is interlocked with the tube member 42, the hexafluorofluoride gas rapidly passes through the gas inlet guides 58 and 58a to the spaces 54 and 54a of the case body 56. By flowing in, the arc generated between the fixed terminal 30 and the rotary terminal 40 is quickly extinguished.

The operation of the present invention configured as described above will be described with reference to FIGS. 5A to 6B.

First, FIG. 5A illustrates a state in which a rotating terminal is connected to a fixed terminal. At this time, an inlet cable and an outgoing cable are connected to each other so that high voltage electricity flows on the distribution line.

In this state, a ground fault occurs, and in order to minimize the damage, only the fault section should be cut off quickly and accurately. In this case, the insulated hook rod among the operation handles exposed to one side of the control box 20 is removed. Pulling the open handle 24a to the lower side by using the mechanism 22 is connected to the operation.

In addition, as shown in FIG. 6B, the tube member 42 of the power connector terminal 40 connected to the shaft 44 on the output side of the mechanism 22 moves in the counterclockwise direction, and the connecting member of the rotary terminal 40 ( 46b) is spaced apart from the fixed terminal 30, which is connected in the inserted state, and a short circuit occurs to cut off the power flowing through the incoming cable and the outgoing cable, thereby reducing the damage.

Meanwhile, a high temperature arc is generated while the connecting member 46b and the fixed terminal 30 of the rotary terminal 40 are separated, and the arc is shown in FIGS. 6A and 6B, the tube member 42 and the rotary terminal. The blade 48 provided so as to span 40 is provided in the case body 56 so as to have substantially the same width in the spaces 54 and 54a provided between the plurality of partitions 52 and 52a, thereby providing a tube member. 42 is rotated and linked together at the same time.

That is, as the inside of the pump is rotated at a low pressure or a vacuum state such as the pressure generated while the guide vane rotates, the sulfur hexafluoride gas is removed from the gas inlet guides 58 and 58a formed at the inner periphery of the case body 56. By quickly flowing through the arc arc generated between the fixed terminal 30 and the rotary terminal 40 is quickly extinguished.

As described above, the present invention replaces the fixed terminal and the movable terminal, which are the connection terminals of the switchgear installed at the branch point of the substation system or the customer inlet side, from the slide method to the rotary method, thereby reducing the volume of the switch, manufacturing and transporting and installing work. Also, the sulfuric hexafluoride gas is rapidly introduced between the terminals of both sides separated from the outside while the movable terminal is separated from the fixed terminal, thereby rapidly extinguishing the high-temperature arc generated. It is to prevent the end of the melting and breakage due to deterioration to enable long-term use.

Claims (3)

In the gas insulated failure section automatic switch provided in the tank filled with the sulfur hexafluoride gas which is the main body of the switch which is provided to open, close, and ground by the sliding ground switch, The fixed terminal provided on the inner circumferential part by rotating the fire-fighting terminal part 40 wrapped in the casing 50 inside the tank 10 filled with sulfur hexafluoride gas through the mechanism 22 through the mechanism 22. Gas insulation failure characterized in that it is configured to be disconnected from the 30 and at the same time the arc generated between the fixed terminal 30 and the rotary terminal 40 is extinguished by the sulfur fluoride gas flowing into the casing (50). Section automatic switchgear. The method of claim 1, The casing 50 is divided into a plurality of partition walls 52 and 52a having a semicircular shape so that predetermined spaces 54 and 54a are provided, and connects inside and outside to one side of the inner circumferential edge of the spaces 54 and 54a. A pair of case bodies 56 having fixed terminals 30 are provided to be connected to each other by a fastening member, and gas inlet guides 58 and 58a are integrally formed at the inner circumference of the case body 56 on one side. Automatic switchgear for gas insulation fault zones. The method of claim 1, The heat exchange terminal portion 40 includes a hollow tube member 42 having a plurality of insertion holes 42a formed integrally with an insulator; A shaft 44 connected to one side end of the tube member 42 by a split pin 44a and connected to the side of the force of the mechanism 22; The connecting member 46b is fixed to both sides of the spacer 46a having a predetermined thickness by the pin 46c and the fixing means 46c-1, and the free end of the connecting member 46b is more predetermined than the spacer 46a. Rotating terminal 40 is formed to protrude to the length of the terminal provided to be connected to both sides of the fixed terminal 30; The rotary terminal 40 is inserted into the insertion hole 42a to be fixed, and the hexafluorofluoride gas is introduced into the spaces 54 and 54a of the case body 56 while interlocking with the tube member 42. Gas switch failure section automatic switchgear characterized in that it consists of a blade 48 having a flat plate connected to the rotary terminal 46 exposed to both sides of the tube member 42 to be introduced through the guide (58, 58a).