JPS5923161B2 - Shutter device for main circuit disconnection section - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutter device for a main circuit disconnection section of a closed switchboard for shielding and opening the main circuit disconnection section.

Recently, closed switchboards have gradually evolved into high-voltage areas, and the expansion of special high-voltage devices is remarkable.On the other hand, there is a strong desire to reduce the size of power generation and substation equipment, and as a component of closed switchboards, it has become widely used as a component. It is used.

The conventional structure of the shutter device that shields and opens the main circuit disconnection section has been simplified and downsized, and
High-performance products with excellent dielectric strength and stable operation have come to be required.

In view of the above-mentioned points, the present invention reduces the height of the device by placing the main circuit disconnection section of the present shutter device between the upper and lower circuit disconnection sections when the main circuit disconnection section is open, and the main circuit disconnection section. By moving the bushing for the disconnecting section to a position close to the boundary wall where the bushing for the disconnecting section is firmly supported, the insulation distance can be increased by moving it away from the exposed live parts on the front of the main circuit disconnecting section. In addition to dealing with high voltages, it also has a structure to prevent unstable operation during shielding operation, which is likely to occur due to such a large rotation stroke, and can use common upper and lower structural members. It is an object of the present invention to provide a shutter device for a main circuit disconnection section.

Embodiments according to the present invention will be described below based on the drawings.

In the figure, 1 is a circuit breaker installed at the front of the closed switchboard;
A drawer-type equipment room in which drawer-type electrical equipment 2 such as transformers and lightning arresters is housed; 3 is a busbar room or fixed equipment room provided at the rear of the drawer-type equipment room; both rooms 1 and 3 are separated by a boundary wall 4; .

Reference numerals 5 and 6 indicate the main circuit disconnection section of the closed switchboard which is fixedly supported through the boundary wall 4, and is formed in the shape of a bushing, and the front end thereof has a contactor-like part that the drawer-type electrical equipment 2 comes into contact with and opens. The live part is exposed, and the rear end is fixed with connection conductors that connect to the bus bar and fixed electrical equipment, and are connected to the power supply and load, respectively, and the surrounding area is surrounded by a bushing for insulation.

Different phase disconnectors are arranged horizontally on the four boundary walls, for example, in three or two rows for three-phase or single-phase AC, and in one row for single-pole ones such as for neutral point grounding, and vertically. In the direction, there is an upper main circuit disconnection section 5 in which the in-phase disconnection section is connected to the power supply, for example;
and a lower main circuit disconnecting section 6 connected to the load.

7 and 8 connect the live parts at the front ends of the upper disconnection section 5 and the lower disconnection section 6 of different phases to the upper and lower main circuit disconnection sections 5 and 6, respectively, for the drawing-out operation of the drawer-type electrical equipment 2 that contacts and opens them. An upper shutter mechanism and a lower shutter mechanism are configured to open or close in conjunction with each other, and are composed of various members described below.

In other words, 9 and 10 are insulators such as synthetic resin plates, and as shown in Figure 2, insulators other than those for single poles are a plurality of different-phase main circuit disconnectors formed long in the horizontal direction and arranged horizontally with one piece. The upper shutter piece and the lower shutter piece 11 and 12, which collectively shield the sections 5 and 6, have one end connected to the upper and lower shutter pieces 9, 11 and 12, respectively.
The upper and lower shutter pieces 9, 10 and the support piece 1 are fixedly supported by machine screws 13 at both ends of the
1.12 constitutes the upper shutter 14 and the lower shutter 15, and at the other end of the support piece 11.12 there are joint pins 16, 16'', 16', 16'.
! From this, the outer lever 17.17' and the inner lever 1B
, are rotatably connected to one end of each of the first and second pieces.

Each of the upper shutter 14 and the lower shutter 15 has an outer lever 17, an inner lever 18, an outer lever 17', and an inner lever 18' at both ends, and these outer levers 17.1γ and inner levers. The other ends 18, 18 are rotatably supported by support shafts 19, 19' and 19'', 19' on both side walls of the closed switchboard via a frame or the like.

In this example, although it will be explained in detail later, the fifth
The outer lever 1 as shown in FIG.
7, 1γ and inner levers 18, 18' all having the same dimensions, and outer levers 17, 17' and inner levers 18, 18 as shown in the operation explanatory diagrams of FIGS. 7 and 8. Although there are two types of shutters with different sizes, both of them are constructed so that the constituent members of the upper shutter mechanism 7 and the lower shutter mechanism 8 can be shared.

Reference numeral 20 denotes an internal connecting pin which rotatably connects the upper shutter mechanism 7 and the lower shutter mechanism 8 constituted by the above members, and which connects the upper and lower shutters 1 in the open state.
4 and 15 between the upper and lower main circuit disconnecting parts 5 and 6, both ends of the internal connecting gun 20 are connected to a point outside the support point of the inner lever 18 of the upper shutter mechanism 7 and the lower shutter. It is connected to a point inside the support point of the inner lever 18' of the mechanism 8.

Reference numeral 21 denotes a drive mechanism that operates the shutter device according to the drawing-out operation of the drawer-type electric device 2, and 22 denotes an outer lever 17 of the lower shutter mechanism 8, one end of which is used to transmit the driving force from the drive mechanism 21 to the shutter device. ', the other end is rotatably connected to the drive mechanism 21, and 23 is connected to the upper and lower shutter mechanisms 7 and 8 via the external connecting gun 22, and the upper and lower main circuit disconnection parts This is a spring for acting in a direction to shield 5 and 6.

In the present main circuit disconnection shutter device having the above structure, as shown in FIG. Let b be the center point of the joint pin 1C that connects the two.

If the center point of the support shaft 19 of the outer lever 17 is C and the center point of the support shaft 1g' of the inner lever 18 is d, then the shutter 1
The shortest distance A connecting the two connection center points a and b on the sides of 4
The straight line indicating the shortest distance B connecting the support center points c and d of the outer lever 17 and the inner lever 18 is the same length, and the connection center point a of the outer lever 17 and the support center point C A straight line indicating the shortest distance C between the inner lever 1
The straight line indicating the shortest distance connecting the connection center point 8 and the support center point d is the same length, and these shortest distances A and B are the same length.

The straight lines C and D form a parallelogram, and the support center point C2d of the outer and inner levers 17 and 18 lies on the perpendicular line Y.
When located above, as the straight lines indicating C and D rotate in the direction of the solid arrow, the straight line indicating A rotates in the direction of the solid arrow while always being parallel to the perpendicular Y, and points to point a, b
When reaches the perpendicular line Y, the straight lines indicating A, B, C, and D become in a straight line and coincide with the perpendicular line Y, so that the points c, d, and a
, b are all located on the perpendicular line Y, forming a dead point. From this state, the straight lines showing C and D move further and pass the perpendicular line Y, so the progression order of the straight lines showing C and the straight line showing D is reversed.

Now, the position shown in the figure passing the perpendicular line Y of the straight line showing A is the opening position of the upper shutter mechanism 7, and the position of the straight line shown A shown centering on the horizontal line X perpendicular to the perpendicular line Y is the upper shutter mechanism 7. When the mechanism 7 is in the shielded position, in this embodiment, as shown in FIG. Since the supporting shaft 19 becomes a non-driving shaft, during the shielding operation from the opening position to the shielding position shown in FIG.
Rotational force P1 acts on the dot due to the rotational driving force at , and the dot begins to rotate in the direction of the dotted arrow.

To light the light at the same time, the component force P2 due to this Pl. P3 is generated, and due to the component force P2, a component force P4. P is generated, and therefore point a begins to rotate due to component force P4, and the straight line indicating A moves parallel to the perpendicular Y.

When the straight line indicating A reaches the position of the perpendicular Y, points c, d, a, and b are again aligned in a straight line and form a dead center, so at this point, the rotational force Pl is required to point the point. The action causes the dot to rotate in the direction of the dotted arrow, but since no rotational force acts on point a, the dot is given an opportunity to take the lead, and at this time both ends of the straight line indicating A and C and The connection point with the straight line indicated by D, and the support points between both ends of the straight line indicated by B and the straight lines indicated by C and D, that is, the connection point between the upper shutter 14 and the outer and inner levers 17 and 18, and the outer and inner levers. Due to the presence of a small gap at the support point 17.18, the dot tends to advance ahead of point a, and for this reason, the straight lines showing C and D, that is, the outside and inside levers 17.18 lose the opportunity to reverse. , A, that is, the upper shutter 14 is in the state shown by the dashed line, and as a result, the upper shutter mechanism 7 becomes inoperable.

Heat theory: Even in such a configuration, the opening position of the upper shutter 14 is set to a position where it passes through the perpendicular line Y, or the supporting shaft 19 of the outer lever 17 is used as a drive shaft, or the outer lever 17, The support shafts 19 and 19' of both inner levers 18 can be used as drive shafts, but if you want to set the opening position of the upper shutter 14 to the position before the perpendicular Y passes, the first As is clear from the figure, as the distance from the main circuit disconnection section becomes closer, the insulation distance becomes smaller, making it unsuitable for high voltage applications.Additionally, placing restrictions on the driving shaft will affect the overall configuration of the device. Both of these are undesirable as they result in increased complexity.

Therefore, in the present invention, a configuration including elements as shown in FIGS. 5 to 8 is adopted.

That is, in the operation explanatory diagram shown in FIG. 9, it is sufficient to provide an element such that when the point a moves on the perpendicular line Y, the point a does not coincide with the perpendicular line Y. As shown in Figures to Figure 8, by making the sum of the straight line showing the shortest distance C and the straight line showing the shortest distance A larger than the sum of the straight line showing the shortest distance and the straight line showing the shortest distance B, be.

In other words, C+A>D×B ・・・・・・・・・・・・
...(1) And as a means to satisfy the above equation, C2D A>B """"°-゛(2) A=B
・・・・・・・・・・・・(3) C>D C>D ・・・・・・・・・・・・(4
)A>B, but in either case, the upper and lower shutter mechanisms shown by the solid line arrows in FIGS. 5 to 8 are 7,
8, when the straight line D coincides with the perpendicular Y and reaches the perpendicular Y, the point a is at a position until it reaches the perpendicular Y, and the point A reaches the perpendicular Y. When the upper and lower shutter mechanisms 7 and 8 reach the opening position, point a is also closer to the perpendicular Y than the point A, and the straight line indicating A makes a certain angle with the perpendicular Y. Form.

Therefore, even at a position passing through the perpendicular line Y, the progression order of the straight line C and the straight line D will not be reversed, as shown in FIG.

Now, in the configuration according to the present invention, during the shielding operation of the upper and lower shutter mechanisms 7 and 8, the component force P generated by the rotational force P1 on the dot when the dot reaches the perpendicular line Y
Even in the case where a rotational force of P4 is generated at point a by 2, a driving force is applied only to the support point d, that is, the support shaft 1g', and no driving force is applied to the support point C1, that is, the support shaft 19. , points a and b both obtain rotational force and are straight lines indicating A, that is, upper and lower shutters 14.15
can continue stable operation.

It should be noted that (2) of the above three elements satisfying the configuration according to the present invention
), the lengths of straight lines indicating C and D of the outer lever 17 and inner lever 18 that make up the upper shutter mechanism 7, and the outer lever 1γ and the inner lever 18' that make up the lower shutter mechanism 8. Since the lengths of the straight lines indicating C and D are the same, all levers 17 and 17'
, 18 and 18' can share the same thing, so it goes without saying that all the members constituting the upper and lower shutter mechanisms 7 and 8 can be used in common, as well as the upper and lower shutter mechanisms that combine these members. The shutter mechanisms 7 and 8 also have the feature that they can be used for both the upper and lower stages, and (3)
C of the outer levers 17 and 17'
Since the length of the straight line indicating D is different from the length of the straight line indicating D of the inner levers 18 and 18', for example, if the upper shutter mechanism 7 is left as is and the lower shutter mechanism 8 is When used as C>
Lower shutter mechanism 8 since D is not true and C<D.
Although it is impossible to share the 7th model as it is because the specified opening stroke cannot be obtained and it becomes inoperable midway, the 7th
As is clear from the figure and the operation explanatory diagram of FIG. 8, on the outer lever 17 and inner lever 18 of the upper shutter mechanism
Since it is possible to use this as the lower shutter mechanism 8 by swapping the lower parts and combining them as 17' and 1 &', two types of levers 17 and 18 must be provided even when the element (3) is provided. Although there are disadvantages in that the upper and lower shutter mechanisms 7 and 8 have a common feature that the constituent members can be shared,
Moreover, it goes without saying that the commonality of a device having the element (4) is the same as that of a device having the element (3).

According to the present invention having the above configuration, it has excellent dielectric strength, can be used for high voltage closed switchboards such as special high voltage, is compact, has extremely stable operation, and can be used in extremely wide variety of component parts. It is possible to obtain the effect that a shutter device for the main circuit disconnection section can be provided with a reduced number of shutters.

[Brief explanation of drawings]

1 and 2 are a front view and a side view of a shutter device for the main circuit disconnection section of a closed switchboard showing one embodiment of the present invention, and FIGS. 3 and 4 similarly show an upper shutter mechanism and a lower shutter mechanism. Detailed views, FIGS. 5 and 6 are explanatory diagrams of the operation of the upper shutter mechanism and the lower shutter mechanism, and FIGS. 7 and 8 are explanatory diagrams of the operation of the upper shutter mechanism and the lower shutter mechanism showing other embodiments, FIG. 9 is an explanatory diagram of the operation of a shutter mechanism using a conventional link mechanism forming a parallelogram. 5...Upper stage main circuit disconnection section, 6''...°°, Lower stage main circuit disconnection section, 7...Upper stage shutter mechanism, 8
...Lower shutter mechanism, 14...Upper shutter, 15...Lower shutter, 17
, 17'...outside lever, 18, 18'...
...Inner lever, 19, 19', 1g'. 19'-... Support shaft, 20... Internal connection cancer, a, a'...... Connection center point between outer lever 17, 1γ and shutter 11.12, b , b'・
...Inner levers 18, 18' and shutter 11.
Connection center point with 12, c, c'... Support center point of outer lever 17, 17', d, d'...
...The support center point of the inner lever 18.18', A...
...Shortest distance between connecting center points a and b and between a' and b', B...Support center points c, d and c', d'
The shortest distance between C...between the connection center point a and the support center point C and al. 1, D: The shortest distance connecting the curve connection center point d and the support center point d, b/, and al.

Claims (1)

[Scope of Claims] 1. An upper shutter 14 and a lower shutter 15 that separately shield the upper and lower main circuit disconnection sections 5 and 6, and outer levers 17 and 17' and inner levers at both ends of the upper and lower shutters 14 and 15, respectively. One end of the lever 18.1B' is rotatably connected to the outer lever 17, 17.
' and the other end of the inner lever 18, 18' is a support shaft 19, 19' on both side walls of the closed switchboard. An upper shutter mechanism 7 consisting of an outer lever 17, 17' and an inner lever 18, 18' rotatably supported by 19', 19f', and a lower shutter mechanism 8 are rotatably supported by an internal connecting pin 20. The upper and lower main circuit disconnecting sections 5.・
6 is configured to be shielded or removed to the rear between the upper and lower main circuit disconnecting portions 5 and 6 to be opened. Support pieces 11, 12 provided
and the respective shortest distances C between the center points a, a' of the joint pins 16, 16' connecting the two and the center points C2C' of the support shafts 19, 19' of the outer levers 17, 17', and the inner lever 18°. Joint pin 1f connecting 18' and support piece 11.12
f. The sum of the center points b and b' of the inner levers 18 and 16' (7) and the shortest distance A connecting the center points a and b or a' and b' is calculated as follows: (7) Greater than the sum of the respective shortest distances between center points d and d' and b and b' and the shortest distance B connecting center points C and d or C' and d'. A shutter device for a main circuit disconnection section, characterized in that: