KR100939605B1 - Contactor assembly for vacuum circuit breaker - Google Patents

Abstract

The present invention is to provide a contact assembly that can prevent a rise in contact resistance due to vibration in a tulip-type contact assembly of a vacuum circuit breaker, and is provided in the main circuit section terminal for connecting the main circuit section terminal and the cradle terminal. A contact assembly of a vacuum circuit breaker, comprising: a contact plate fixedly connected to the main circuit terminal; An electrical conductor plate arranged along concentric circles and having a first convex portion in contact with the main circuit portion terminal and a second convex portion in contact with the cradle terminal and a planar portion between the first convex portion and the second convex portion; A plurality of contact fingers (FINGER) capable of moving back and forth relative to the contact plate when there is vibration such that an increase in contact resistance with the main circuit portion terminal is prevented; A support plate having a plurality of teeth formed on an outer circumferential surface thereof and supporting the plurality of contact fingers between the teeth and the teeth; And a plurality of annular springs that provide elastic pressure concentrically on the plurality of contact fingers.

Vacuum circuit breaker, tulip type contactor, preventing contact resistance increase

Description

CONTACTOR ASSEMBLY FOR VACUUM CIRCUIT BREAKER}

The present invention relates to a vacuum circuit breaker, and more particularly, to a contact assembly of a vacuum circuit breaker capable of effectively preventing a contact resistance increase between a contact finger and a main circuit terminal due to vibration in a contact assembly of the vacuum circuit breaker.

A vacuum circuit breaker is an electric device that can protect a line and a load by breaking a circuit of a power supply against a fault current such as opening and closing and short circuit current of a relatively high voltage circuit in a power system.

The vacuum circuit breaker is a vacuum interrupter for each phase of the phase (PHASE), such as a three-phase alternating current having a fixed contact fixed in the vacuum vessel so as to open and close the contact in the vacuum vessel, and a movable contact capable of moving to or from the fixed contact. VACUUM INTERRUPTER, an actuator and a power transmission mechanism for driving the movable contactor of the vacuum interrupter, and a main circuit portion mainly comprising a transport cart which supports them and draws in or pulls out by a manual drive unit or a separate automatic drive unit; A cradle portion having a terminal portion connected to an external power supply and a load side and usually configured as a busbar, and connected to the main circuit portion at a retracted position and separated from the main circuit portion at a retracted position; It is composed. For the configuration of the vacuum circuit breaker configured as described above, reference may be made to Patent Registration No. 0722479 filed by the applicant of the present invention (patent name: vacuum circuit breaker).

The present invention relates to a contactor provided in a terminal of the main circuit portion in order to connect a terminal of the main circuit portion and a terminal of the cradle portion to be connected to each other at the retracted position.

As such a contactor, a contact in which a plurality of contact fingers are arranged in a shape of a Tulip flower (TULIP) is commonly used as a contactor called a Tulip-type contact.

On the other hand, in the vacuum circuit breaker according to the prior art, the tubular contactor for connecting the terminal of the main circuit portion and the terminal of the cradle portion includes a star support plate fixed to the terminal of the main circuit portion, and the support plate. It is composed of a plurality of contact fingers supported, wherein the contact fingers have a relatively immovable fixed structure relative to the support plate.

Therefore, for example, in the process of transporting the vacuum circuit breaker from the manufacturing plant to the installation site in order to install a vibration, a part where the contact finger and the terminal of the main circuit part are in contact with each other according to the vibration becomes constant. This is because the contact fingers have a fixed structure which is relatively immovable with respect to the support plate. Therefore, a large contact stress is generated between the main circuit terminal and the contact finger due to the repeated contact of a certain portion due to the vibration, thereby causing the contact between the two objects. Raise the contact resistance. This phenomenon is also called fretting phenomenon.

As such, when the contact resistance between the two objects is increased, when the vacuum circuit breaker is installed in the field and the current is applied, the contact portion between the main circuit terminal and the contact finger generates heat due to the high contact resistance, and the temperature rises to a high temperature. A problem arises. This causes problems such as deterioration and damage of these main circuit part terminals and contact fingers, and even larger electrical accidents.

Accordingly, the present invention is to solve the problems of the prior art, an object of the present invention is to provide a contact assembly of a vacuum circuit breaker that can prevent the increase in contact resistance due to the repeated contact of a specific portion during vibration.

An object of the present invention, in the contact assembly of the vacuum circuit breaker is provided in the main circuit portion terminal for connecting the main circuit portion terminal and the cradle (CRADLE) terminal,

A contact plate fixedly connected to the main circuit part terminal;

An electrical conductor plate arranged along concentric circles and having a first convex portion in contact with the main circuit portion terminal and a second convex portion in contact with the cradle terminal and a planar portion between the first convex portion and the second convex portion; A plurality of contact fingers (FINGER) capable of moving back and forth relative to the contact plate when there is vibration such that an increase in contact resistance with the main circuit portion terminal is prevented;

A support plate having a plurality of teeth formed on an outer circumferential surface thereof and supporting the plurality of contact fingers between the teeth and the teeth; And

It can be achieved by providing a contact assembly of a vacuum circuit breaker according to the invention, characterized in that it comprises a plurality of annular springs to provide an elastic pressure concentrically on the plurality of contact fingers.

Since the contact assembly of the vacuum circuit breaker according to the present invention is movable with respect to the support plate supporting the contact finger when there is vibration, a contact resistance increase due to repetitive contact between the contact finger and the main circuit terminal portion due to vibration is obtained. Can be.

The contact assembly of the vacuum circuit breaker according to the present invention is prevented from increasing contact resistance due to repetitive contact between the contact finger and the main circuit terminal portion when there is vibration, so that contact is made between these contact fingers and the main circuit terminal portion during energization of the vacuum circuit breaker. It is possible to obtain an effect of preventing heat generation and temperature rise due to an increase in resistance.

The contactor assembly of the vacuum circuit breaker according to the present invention prevents heat generation and temperature rise due to an increase in contact resistance at the contact finger and the main circuit part terminal portion, thereby preventing deterioration or damage of these parts and thus extending the service life of the vacuum circuit breaker. Long life can be achieved and electrical accident can be prevented.

The object of the present invention and the constitution and effects of the present invention to achieve the same will be more clearly understood by the following description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Referring to Fig. 1, which is an exploded perspective view showing the disassembled state of the main circuit unit terminal and the contact assembly in the contact assembly of the vacuum circuit breaker according to the present invention with respect to the state of use of the contact assembly of the vacuum circuit breaker according to the present invention. same.

In Fig. 1, reference numeral 1 designates a main circuit part terminal in a vacuum circuit breaker, and a bus bar part constituted by a flat plate-shaped electrical conductor connected to a main circuit part (not shown) by a connecting means such as a bolt. (1a) and a tubular end having an expanded diameter integrally formed at the ends of the cylindrical extension portion 1b and the cylindrical extension portion 1b, which are cylindrical electrical conductor portions extending from the busbar portion 1a. It is comprised, including the tubular part 1c. Here, the tubular end portion 1c has a hollow 1c-3, and the plate connection surface 1c-1 is a surface on which the end surface is to be connected to a contact plate (see 5 in Fig. 2) to be described below. The plate connecting surface 1c-1 has a fixing bolt hole 1c-2 into which the fixing bolt 3 for fixing the contact plate is inserted. Four anticipated fixing bolts 3 of the present invention are used, and thus are corresponding fixing bolt holes 1c-2. The fixing bolt 3 and the fixing bolt hole 1c-2 may be modified in three or two embodiments.

The contactor assembly 2 is connected to the main circuit part terminal 1 by the fixing bolt 3.

A cradle terminal, that is, a cradle side terminal, not shown, may have the same or similar structure and shape as that of the main circuit portion terminal 1, and in particular, a relative portion contacting the contact assembly 2 of the present invention may be connected to the main circuit portion terminal ( It has the same cylindrical shape as the tubular end 1c of 1).

On the other hand, in the contact assembly of the vacuum circuit breaker according to the present invention, Figure 2 is an exploded perspective view showing a detailed configuration of the contact assembly in an exploded state, and the configuration of the contact assembly in a state in which the contact assembly of the vacuum circuit breaker according to the present invention is assembled; 3 is a longitudinal cross-sectional view showing a relative position and a partial enlarged view showing an enlarged configuration of a contact finger relatively movable with respect to a contact plate in the contact assembly of the vacuum circuit breaker according to the present invention. Referring to the detailed configuration of the contact assembly of the vacuum circuit breaker according to the following.

The contact assembly of the vacuum circuit breaker according to the present invention is installed in the main circuit unit terminal 1 to connect the main circuit unit terminal 1 and the cradle (not shown) as described above with reference to FIG. As shown in FIG. 2, the contact plate 5 includes a plurality of contact fingers FINGER 7, support plates 6 and 8 and annular springs 4a and 4b.

The contact plate 5 is fixedly connected to the main circuit part terminal (see 1 in FIG. 1) as described with reference to FIG. Therefore, the contact plate 5 has a fixing bolt through hole 5a through which a fixing bolt (see 3 in FIG. 1) for fixing to the main circuit part terminal is provided. Is formed.

As can be seen with reference to FIGS. 2 to 4, the plurality of contact fingers 7 are arranged along concentric circles, and the first convex portion (see symbol 7e1 in FIG. 3) in contact with the main circuit portion terminal. ) And a second convex portion (see reference numeral 7e2 in FIG. 3) in contact with the cradle terminal and a planar portion 7f between the first convex portion 7e1 and the second convex portion 7e2. It is composed. The upper surface of the contact finger 7 is provided with first to fourth spring seating grooves 7a-7d which provide a portion for the following spring to seat.

As can also be seen with reference to FIG. 4, the plurality of contact fingers 7 are relatively movable with respect to the contact plate 5 when there is vibration such that an increase in contact resistance with the main circuit portion terminal is prevented.

In more detail, as can be seen with reference to FIGS. 3 and 4, the contact plate 5 is arranged between the first convex portion 7e1 of the contact finger 7 and the support plate (more specifically, the first support plate 6). Located at the end wall surface 7e1-1 of the first convex portion 7e1 and the support plate (more specifically, the first support plate) such that a plurality of contact fingers 7 are movable relative to the contact plate 5. (6)} the distance W1 is longer than the thickness W2 of the contact plate 5, the inner diameter of the contact finger 7 (in particular the inner diameter of the flat portion 7f) (D1) is the contact plate 5 It is larger than the outer diameter D2 of.

In other words, the horizontal position of the end wall surface 7e1-1 of the first convex portion 7e1 is called E1, and the horizontal position of the main circuit portion side edge of the first support plate mounting groove 7f1 is E2. When the horizontal position of the first supporting plate is E3, the distance between the end wall surface 7e1-1 of the first convex portion 7e1 and the supporting plate (more specifically, the first supporting plate 6) ( W1 is a distance between the horizontal position E1 of the end wall surface 7e1-1 and the horizontal position E3 of the first supporting plate 6, and this distance W1 is the contact plate 5. It is longer than the thickness W2, so that a plurality of contact fingers 7 are movable in the horizontal direction, that is, in the front-rear direction relative to the contact plate 5 fixed to the main circuit part terminal.

Further, although the contact finger 7 is movable in the horizontal direction, that is, in the front-rear direction relative to the contact plate 5 fixed to the main circuit part terminal, as shown in Fig. 4, the convexity of the first convex portion 7e1 Since the tip extends beyond the contact plate 5 in the vertical direction, the first convex of the contact finger 7 against the contact plate 5 when the contact finger 7 flows in the horizontal direction to the right in FIG. 4. The contact 7e1 stops by contact and prevents the contact finger 7 from escaping from the main circuit terminal (see 1 in FIG. 1), and in FIG. 4 the contact plate when the contact finger 7 flows horizontally to the left. The first support plate 6 comes into contact with 5 to stop the contact finger 7 from further entering the main circuit terminal (see 1 in Fig. 1).

In addition, since the inner diameter of the contact finger 7 (in particular, the inner diameter of the flat portion 7f) D1 is larger than the outer diameter D2 of the contact plate 5, a plurality of contact fingers 7 are connected to the main circuit portion terminal. It is movable in the vertical direction, that is, the vertical direction, relative to the fixed contact plate 5.

The support plates 6 and 8 have a plurality of teeth 6a and 8a formed on the outer circumferential surface thereof, and the plurality of teeth are provided in the valley portion between the teeth and the teeth 6b and 8b. Fit the contact finger (7).

In more detail, the support plates 6, 8 determine a one-side limit for the flow of the contact finger 7 and are located adjacent to the contact plate 5 and the first support plate 6. It is configured to include a second support plate 8 located farther from the contact plate than).

The first support plate 6 is composed of a flexible plate so as to bend and absorb an impact when it collides with the contact plate 5 by the flow of the contact finger 7. More preferably, the first support plate 6 may be made of an electrical insulating material, and may be made of a synthetic resin plate material having flexibility capable of bending and having electrical insulation.

Annular springs 4a and 4b are provided to provide elastic pressure concentrically on the plurality of contact fingers 7 and each of the first annular spring 4a and the second including a pair of annular springs. It is comprised including the annular spring 4b. These first annular springs 4a and second annular springs 4b are respectively seated in the first to fourth spring seating grooves 7a-7d to elastically concentrically on the plurality of contact fingers 7. To provide pressure. The concentric direction here means a direction toward the center of such a circle when a plurality of contact fingers 7 are arranged along one common circle as described above and the center of the circle is concentric.

Referring to the effect of the contact assembly of the vacuum circuit breaker according to the present invention configured as described above are as follows.

The contact assembly of the vacuum circuit breaker according to the present invention has a distance W1 between the end wall surface 7e1-1 of the first convex portion 7e1 and the support plate (more specifically, the first support plate 6) as described above. Since is longer than the thickness W2 of the contact plate 5, the plurality of contact fingers 7 are movable in the horizontal direction, that is, in the front-rear direction relative to the contact plate 5 fixed to the main circuit part terminal.

In addition, since the inner diameter of the contact finger 7 (in particular, the inner diameter of the flat portion 7f) D1 is larger than the outer diameter D2 of the contact plate 5, a plurality of contact fingers 7 are connected to the main circuit portion terminal. It is possible to flow in the vertical direction, that is, the vertical direction, relative to the fixed contact plate 5.

Therefore, in the horizontal or vertical direction vibration generated in the process of transporting the vacuum circuit breaker from the manufacturing plant to the installation site in order to install the vacuum breaker, the horizontal direction relative to the contact plate 5 to which the contact finger 7 is fixed Alternatively, since it is movable in the vertical direction, the position where the contact finger 7 contacts the main circuit terminal 1 is changed to prevent the rising resistance (fretting phenomenon) of the contact resistance, thus installing a vacuum circuit breaker in the field and energizing In operation, deterioration or damage of the contact finger 7 and the main circuit part terminal 1 can be prevented by heat generation and temperature rise at a specific site of high contact resistance. Therefore, the operation reliability of the vacuum circuit breaker can also be ensured, and there is an effect of obtaining a long life vacuum circuit breaker.

1 is an exploded perspective view illustrating an exploded state of a main circuit unit terminal and a contact assembly in a contact assembly of a vacuum circuit breaker according to the present invention;

Figure 2 is an exploded perspective view showing a detailed configuration of the contact assembly in the contact assembly of the vacuum circuit breaker according to the present invention,

Figure 3 is a longitudinal cross-sectional view showing the configuration and relative position of the contactor assembly in the contactor assembly of the vacuum circuit breaker according to the present invention,

FIG. 4 is an enlarged view inside circle A of FIG. 3 showing an enlarged configuration of a contact finger that is relatively movable relative to a contact plate in the contact assembly of the vacuum circuit breaker according to the present invention.

* Explanation of symbols on the main parts of the drawings

1: main circuit terminal 1a: busbar section

1b: cylindrical extension 1c: tubular end

1c-1: Plate connection surface 1c-2: Fixing bolt hole

1c-3: hollow 2: contact assembly

3: fixing bolt 4a: first annular spring

4b: second annular spring 5: contact plate

5a: fixing bolt through hole 6: first support plate

6a: pubic 6b: pubic

6c: bolt guide groove part

7: contact finger 7a: first spring seating groove

7b: second spring seating groove 7c: third spring seating groove

7d: 4th spring seating groove 7e1: 1st convex part

7e1-1: End wall surface 7e2: 2nd convex part 7f: Flat part 7f1: 1st support plate mounting groove

8: second support plate 8a: tooth

8b: pubic bone E1: horizontal position of the end wall

E2: Horizontal position of the main circuit part edge of the first support plate mounting groove

E3: horizontal position of the first support plate

Claims (5)

In the contactor assembly of the vacuum circuit breaker provided in the main circuit section terminal for connecting the main circuit section terminal and the cradle terminal, A contact plate fixedly connected to the main circuit part terminal; An electrical conductor plate arranged along concentric circles and having a first convex portion in contact with the main circuit portion terminal and a second convex portion in contact with the cradle terminal and a planar portion between the first convex portion and the second convex portion; A plurality of contact fingers (FINGER) relatively movable with respect to the contact plate when there is vibration such that an increase in contact resistance with the main circuit portion terminal is prevented; A support plate having a plurality of teeth formed on an outer circumferential surface thereof and supporting the plurality of contact fingers between the teeth and the teeth; And And a plurality of annular springs that provide elastic pressure concentrically on the plurality of contact fingers, The contact plate is located between the first convex portion of the contact finger and the support plate, and the end wall surface of the first convex portion and the support plate so that the plurality of contact fingers can flow in a horizontal direction relative to the contact plate. The distance between the contact assembly of the vacuum circuit breaker, characterized in that longer than the thickness of the contact plate. delete The method of claim 1, And the inner diameter of the planar portion of the contact finger is larger than the outer diameter of the contact plate such that the plurality of contact fingers are movable in a direction perpendicular to the contact plate. The method according to claim 1 or 3, The support plate, A first support plate that determines one side limit for the flow of the contact finger and is located adjacent to the contact plate; And And a second support plate positioned farther from the contact plate than the first support plate. The method of claim 4, wherein The first support plate is a contact assembly of the vacuum circuit breaker, characterized in that configured to be flexible to absorb the impact when the impact on the contact plate by the flow of the contact finger.

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