JPH02193506A - Disconnector interlocking device for switchboard - Google Patents

Abstract

PURPOSE:To surely interlock by enabling a key for operating the main circuit of a switchboard, to be removed from or inserted into a grounding switch interlocking section, only when a grounding switch is in a disconnected state. CONSTITUTION:When a switchboard is in operation state, then a grounding switch is in a disconnected state, and a rod pin 11 is engaged with the pin hole 8 of an operating piece 6, and so an operating handle 5 cannot be inserted into a square-columnar section 4, and so an operating shaft 3 cannot be rotationally moved, and the grounding switch is locked not to be closed. In this case, a key 23 is in the state of (A), and can be removed from or inserted into the interlocking section. When the key 23 is rotationally moved and is positioned at (B), then the key 23 cannot be removed from the section. In this case, the rod pin 11 is removed from the pin hole 8, and the engagement is released, and the grounding switch can be closed. The key 23 cannot be used and so a breaker is not closed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The second invention is an interface that detects the closing and disconnecting states of a disconnector such as a grounding switch in a power distribution board, and also reliably prevents erroneous operation. Regarding locking devices, it is also used in three-point disconnectors.

[Conventional technology]

The interlock of the earthing switch of the switchboard, especially regarding the grounding conditions, makes it impossible to operate the earthing switch when locked, enables operation when disconnected, and conversely prevents other main circuit equipment, such as It is necessary to prevent the circuit breaker from being operated.

On the contrary, it is also necessary to lock it in the grounded state and to prevent the operation of the earthing switch on the secondary side of the load-side transformer, for example, in the disconnected state.

FIG. 2 shows a conventional electrical interlock device. An end of an operating shaft 3 for opening and closing a known earthing switch (not shown) is peeking through a hole 2a of a mounting plate 2 fixed to an operating surface 1 of a switchboard. This end part is a prismatic part 4 such as a hexagonal prism or a spline shaft, into which the tip of an operating handle 5 that penetrates the operating surface 1 and is inserted through the hole 2a can be removably fitted. An operating piece 6 is further fitted into the prismatic portion 4 so as to be slidable in the axial direction, and is dimensioned so that it completely surrounds the prismatic portion 4 at the position moved to the end side. The operating handle 5 does not fit into the prismatic portion 4. A spring 7 is provided on the opposite end side of the prismatic portion 4 via a washer 7a to bias the operating piece 6 toward the end. . When the operating handle 5 is pushed in against the spring 7, the operating piece 6 slides in the axial direction and the operating handle 5 is fitted into the prismatic portion 4.

The rotation of the operating handle 5 causes the operating shaft 3 to rotate, thereby opening and closing the earthing switch.

The operating piece 6 is provided with a pin hole 8 in the radial direction, and when the pin hole 8 faces upward as shown in the figure, the switch is in the disconnected state, and when the operating shaft 3 is rotated 90 degrees from this position, the switch is in the closed state. It's supposed to be.

The solenoid 51 as an electrical interlock is mounted on the mounting plate 2.
The solenoid pin 52 of the solenoid pin 52 faces the pin input of the operating piece 6 as shown in the figure. When the solenoid is not energized, it is biased by a spring 53, and the solenoid pin 52 is inserted into the pin hole 8 and engaged. At this time, since the operating piece 6 cannot slide in the axial direction, the operating handle 5 cannot be fitted into the prismatic portion 4, and there is no means for rotating the operating shaft 3. In other words, the earthing switch cannot be turned on.

The solenoid 51 is energized and the solenoid pin 52 is connected to the spring 5.
3 and is no longer engaged with the pin hole 8, the operating piece 6 becomes able to slide, and the operating handle 5
is fitted into the prismatic portion 4, and by rotating the operating handle and rotating the operating shaft 3, the earthing switch can be turned on and off. That is, closing and disconnecting are possible only when the solenoid 51 is energized, and an interlock system is configured depending on the energizing conditions of the solenoid.

[Problem to be solved by the invention]

The above-mentioned conventional technology has the following problems.

(a) Since an interlock is established depending on the excitation conditions of the solenoid, a power source is always required.

(b) In the event of a power outage, it will be impossible to close the earthing switch in the same way as when it is locked, making it unsafe to inspect the switchboard, etc., so it is necessary to take safety measures by using another means of closing the switch. .

(c) A display device is required to detect interlock conditions.

(d) There is a method to check by actually inserting the operating handle without installing an interlock condition display device, but if insertion is not possible, the interlock condition is not satisfied and the solenoid is not energized. It is unclear whether the wire is broken or not.

(e) Some solenoids are equipped with complex electrical interlock circuits, but the reliability of the circuit decreases due to contact welding, cable breakage, etc.

An object of the present invention is to provide a power distribution board disconnector interlock device that does not require a power supply, allows safe operation of the disconnect switch even during a power outage, ensures interlock condition display, and has a highly reliable interlock system. It's about getting.

[Means to solve the problem]

The first invention includes a prismatic part provided at the end of an operating shaft for opening and closing a disconnector of a power distribution board, to which an operating handle can be attached and removed; an operating piece that surrounds the prismatic portion to prevent attachment of the operating handle when fixed to the prismatic portion; a spring that urges the operating piece toward the end; and a radial pin hole provided in the operating piece. A switchboard disconnector interlock device comprising: a lock having a rod that can be moved in and out in the axial direction; and a rotatable key that moves the rod, and the key engages the lock only when the rod is protruded. When the rod comes out, it engages with the pin hole of the operating piece and pushes the operating piece to the end only at a desired rotational position of the operating piece that corresponds to the desired open/close state of the disconnector. This is a disconnector interlock device for a switchboard that is fixed to the side of the switchboard.

A second invention is a disconnector for a power distribution board according to the above 1), in which a rod pin is provided between the pin hole of the operating piece and the rod of the lock, the rod pin being biased in the rod direction and engaging with the pin hole when the rod comes out. It is an interlock device.

A third aspect of the present invention is the disconnector interlock device for a power distribution panel according to the above 1) or 2), wherein the desired opening/closing state of the disconnector is a disconnected state of the disconnector.

A fourth invention is the above-mentioned or 2), wherein the desired opening/closing state of the disconnector is one set consisting of a pin hole and a lock in the disconnected state, and the desired opening/closing state of the disconnector is the pin hole in the closed state. The present invention is a disconnector interlock device for a power distribution board, wherein one key of the one lock and the other key of the other lock have different shapes and are not compatible with each other.

[Effect]

In the first invention, the desired opening/closing state of the disconnector in which the rod comes out and engages with the pin hole is when the disconnector is in the disconnected state, in the closed state, or in a three-point disconnector.
It is possible to select a particularly desired state that is a neutral state between the new route and the introduction.

The operation when the desired state is set to the disconnected state will be explained below as an example. When the rod is inserted into the pin hole and engaged, the sliding operation piece is prevented from sliding and the prismatic part is turned off. The surrounding and operating handle cannot fit into the prismatic part. Therefore, it becomes impossible to rotate the operating shaft with the operating handle, and the disconnector cannot be turned on from the disconnected state. When the rod comes out and the lock is released, it is possible to insert the rod. Even if you try to insert the rod in the loaded state, the pin holes are at different positions on the circumference and you cannot insert the rod. Further, the key can be inserted and removed from the lock only when the rod of the lock is engaged with the pin hole, that is, only in the disconnected state, and the main circuit equipment of the switchboard can be operated with this key, thereby establishing an interlock. Even if you try to turn the key in the inserted state, the rod will hit the same part of the operating piece that does not have a pin hole, so you can clearly sense the inserted state.

In the second invention, because of the intervening rod pin, -
It is easy to replace the set lock and key, and no excessive force is applied to the lock by the operating handle.

In the third invention, the desired opening/closing state of the disconnector is limited to the disconnected state, which is exemplified in the detailed description of the first invention.

In the fourth invention, the pin hole, the lock, and the key are provided in two sets corresponding to the desired opening/closing state, a disconnected state and a closed state,
The keys have different shapes.

Therefore, while the disconnected state is the same as that exemplified in the detailed description of the first invention, the closed state is also similar to that illustrated, but the closed and disconnected conditions are interchanged, and only in the closed state is the other The key can be inserted and removed from the lock,
An interlock is established in which, for example, a second earthing switch on the secondary side of a transformer on the load side of the power distribution board can be operated with the other key.

(Embodiment) FIG. 1 shows an interlock device of an embodiment. In the drawings, the same reference numerals as in FIG. 2 have approximately the same functions. That is, a mounting plate 2 provided on the operating surface 1 of the switchboard and provided with a hole 2a has an operating shaft 3 for opening and closing a grounding switch (not shown), and an operating handle 5 provided at the end of this operating shaft.
a removable prismatic part 4; an operating piece 6 that is slidably fitted in the prismatic part in the axial direction and surrounds the prismatic part 4 when it is on the end side; Spring 7 that biases
and a radial pin hole 8 which is provided in the operating piece 6 and prevents the operating shaft 3 from rotating when a pin is inserted.

As a characteristic structure of this embodiment, the rod 22 of the lock 21 is arranged on the radial extension of the pin hole 8 with the rod pin 11 interposed therebetween.

The rod 22 faces in the same axial direction as the radial direction, and can be taken in and out by a known internal mechanism (not shown) of the lock 21! 23 to move the rod 21 in and out. As shown in parts (A) and (B) of the drawing, the rotatable key 23 is locked only when the lower end of the rod 22 is exposed.
3 can be pulled out from the lock 21 and inserted (A)
, 1 at the other position where the rod 22 is pulled in by rotating it!
23 cannot be removed or inserted (B)
.

By the way, the ability to insert and remove the key is similar to that of an engine key, rather than a door key, if we take a typical passenger car as an example.

The rod pin 11 interposed between the rod 22 and the pin hole 8 is slidable up and down by a U-shaped holder 12 fixed to the mounting plate 2. The rod pin 11 is urged upward by a compression spring 13 inserted between a washer 13a fixed to the rod pin 11 side and the lower surface of the holder 12. Then, when the key 23 is turned from the state (B) to the state (A), the rod 22 of the lock 21 comes out downward,
The rod pin 11 is moved downward against the spring 13, and its tip engages with the pin hole 8 of the operating piece 6.

Note that the rod 22 of the lock 21 may be directly engaged with the pin hole 8 without intervening the rod pin 11.

The cooperative relationship between the rod pin 11 (or rod 22) and the members around the operating shaft 3 is similar to that of the conventional solenoid 5.
This is similar to the relationship between the solenoid pin 52 and the operating shaft 3 etc. in No. 1.

Based on the mechanical operations of each part explained above, the entire interlock system of this embodiment will be explained in accordance with the order of operation.

First, when the switchboard is in normal operation, the earthing switch is naturally disconnected, and the rod pin 11 is engaged with the pin hole 8 of the operating piece 6. ! Regarding only 23, it is in the state (A). At this time, since the operating handle 5 cannot be inserted into the prismatic portion 4 due to the engagement of the rod pin 11, the operating shaft 3 cannot be rotated, and the earthing switch is locked so that it cannot be closed. At this time, since the key 23 in state (A) can be inserted and removed, it is removed to unlock and stop the circuit breaker, for example. Or first stop the circuit breaker with key 23 and then
! 23 may be inserted into the lock 21.

Next, when 123 is rotated from state (A) to state (B), rod pin 11 comes out of pin hole 8 and the engagement is released.
It is now possible to turn on the earthing switch, and it is no longer necessary to use the key 23.
cannot be removed from the lock 21. Therefore, the circuit breaker cannot be operated by mistake.

Then, the operation handle 5 is used to turn on the earthing switch. The hole 2a of the mounting plate 2 is a square hole corresponding to the opening/closing rotation angle of the operating shaft 3, and the outer shape of the tip of the operating handle 5 is a square corresponding to the opening/closing rotation angle of the operating shaft 3. The base is a round shape smaller than the sides of the square. If so, the operation handle 5 can be inserted and removed only at the new route and the input position.

If you try to turn the key 23 in this inserted state,
As mentioned above, the operating piece 6 is located at 9 along with the operating shaft 3.
0＠It is rotating and the pin hole 8 is on the extension of the rod pin 11.
Instead, it hits the peripheral surface of the operating piece 6.

Therefore, i! 23 cannot be rotated, and it is possible to sense that it is in the closed state by its reaction. This is more intuitive and clear than the conventional display of interlock conditions. However, it is easy to use multiple displays.

If the operation handle is inserted again in the closed state and returned, the connection will be disconnected, and if the key 23 is turned to the state (A), the 11
23 is out. This key can then be used to unlock circuit breakers, etc.

Finally, additional parts of the second invention, ie, the rod pin 11 and the like, will be explained. Those structures and the rod pin 11 are omitted, and the rod 22 of the lock 21 is directly connected to the pin hole 8.
It has already been explained that it may be made to engage with.

By the way, when viewed from the perspective of a switchboard equipped with a grounding switch and the entire power system in which this switchboard is installed, the lock 21 and key 23 of the - set may be replaced from a management standpoint. It is also possible that the key 23 is lost. In that case, the dimensions of the rod of the new lock, especially the diameter of the tip, vary, and it is often inconvenient to engage the rod directly into the pin hole 8. Furthermore, due to the strength of the locking portion, for example, in the engaged state, it is often possible that an unreasonable force is applied to the rod of the lock when attempting to accidentally insert the operating handle 5 into the prismatic portion 4.

By interposing the rod pin 11 between the pin hole 8 and the lock, it is possible to replace the lock and cope with the problem of insufficient strength as described above.

FIG. 3 is a sectional view of a different embodiment, FIG. 4 is a sectional view showing a different state from FIG. 3, and FIG. 5 is an interlock system diagram using the one shown in FIG. Components having the same reference numerals as in the previous embodiment have approximately the same functions.

Figure 3 shows the disconnected state (P), and in the figure, the operating shaft 3
The area approximately above the center of is the same as in FIG. That is,
The rod 22 of the lock 21 is pulled in (B), and the key 23 cannot be removed, and the rod pin 11 is not engaged with the pin hole 8, so the operating handle 5 is inserted into the prismatic part 4 and the operating shaft 3 is removed. Rotating indicates that the earthing switch is closed.

If the key 23 is turned in the disconnected state as shown in part (A) of the drawing, the operating shaft 3 is locked and the N23 can be removed.

The operation piece 6 has the other pin hole 8 at a position 90° from the pin hole 8.
1 is provided, a member similar to that above the operating shaft 3 is also provided below as shown in the figure, and the other lock 82 is provided which includes the other rod 22 and is rotated by the other key 83. N8
3 is not only impossible to remove at the rotating position shown in part (D) of the drawing, but when trying to rotate it, it hits the same part of the operating piece 6 that does not have a pin hole 81, resulting in a disconnected state. It turns out that there is something. The key 83 can be removed at the position shown in part (C). The key 23 has a different shape from the key 83, and the key 23 cannot be used with the lock 82, and vice versa, so they are not compatible. Note that the position of pin hole 81 with respect to pin hole 8 is 90°.
The pin hole 81 is not necessarily provided at any position, and it is sufficient that the pin hole 81 faces the rod of the other lock 82 in the closed state. Therefore, for example, the pin hole 81 is not provided, and the rod of the lock 82 is oriented in the radial direction of the pin hole 8 in the closed state,
The pin hole 8 may also be used for locking disconnecting and closing.

FIG. 4 shows the charging state Ill (Q), which is obtained by rotating the operating shaft 3 of FIG. 3 by 90 degrees. ! ! 23.83 is in a position (B, D) that cannot be removed, and the key 23 cannot be turned, but! ! Rotate 83 (D→C) to lock it in the closed state, then i! 83 can be extracted (C). If the key 83 is not turned, the operation handle 5 can be used to disconnect the connection.

FIG. 5 is an interlock system diagram of this embodiment using two sets of interlock devices. In the illustrated state, the earthing switch is disconnected, the rod of the lock 21 is protruded and locked, and the i! 23 is removable and can be removed to unlock the circuit breaker. Since the rod of the lock 82 is retracted and the key 83 cannot be removed, the second earthing switch located at the lower level cannot be closed and an interlock is formed. Interlocks in other operating situations can be easily read from this system diagram.

〔Effect of the invention〕

This group of inventions consists of a prismatic part that is provided at the end of an operating shaft for opening and closing a disconnector of a power distribution board, to which an operating handle can be attached and removed; an operating piece that surrounds the prismatic portion to prevent the operating handle from being attached when fixed; a spring that biases the operating piece toward the end; and a radial pin hole provided in the operating piece. A switchboard disconnector interlock device comprising a lock having a rod that can be moved in and out in the axial direction, and a rotatable key that moves the rod, and the key is inserted into the lock only when the rod is protruded. When the rod comes out, it engages with the pin hole of the operating piece and pushes the operating piece into the end only when the operating piece is in a desired rotation position that corresponds to the desired open/close state of the disconnector. Since it is fixed to the side, the key becomes a signal for the interlock device, so there is no need for a power source, and even in the event of a power outage, it is easy to turn on a disconnector such as a grounding switch, making maintenance and inspection of the switchboard safer. Since the input state is clearly indicated by the response to the rotation of the key, there is no need for a display device, and there is an effect that danger due to misreading of the display can be avoided.

In particular, the fourth invention is capable of forming respective interlocks in, for example, an upper-level circuit breaker and a lower-level second earthing switch of a power system, and uses a key change box or the like to create a more complicated mechanical key. This has the effect of being able to form interlocks.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the embodiment, FIG. 2 is a sectional view of a conventional example, FIG. 3 is a sectional view of a different embodiment, and FIG. 4 is a sectional view showing a different state from FIG. FIG. 5 is an interrotter system diagram using the one shown in FIG. 3... Operating shaft, 6... Operating piece, 8.81... Pin hole, diagram

Claims (1)

[Scope of Claims] 1) A prismatic part provided at the end of an operating shaft for opening and closing a disconnector of a power distribution board, to which an operating handle can be attached and removed; an operating piece that surrounds the prismatic part to prevent the operating handle from being attached when fixed to the end side; a spring that biases the operating piece toward the end; and a radial spring provided on the operating piece. A switchboard disconnector interlock device consisting of a pin hole includes a lock having a rod that can be moved in and out in the axial direction, and a rotatable key that moves the rod, and the key is turned on only when the rod is protruded. The rod can be inserted into and removed from the lock, and only at a desired rotational position of the operating piece corresponding to a desired open/closed state of the disconnector, when the rod comes out, it engages with the pin hole of the operating piece and the operating piece is removed. A disconnector interlock device for a power distribution board, characterized in that the is fixed to the end side. 2) In the switchboard disconnector interlock device according to claim 1, a rod pin is provided between the pin hole of the operation piece and the rod of the lock, and is biased in the direction of the rod and engages with the pin hole when the rod comes out. A disconnector interlock device for a switchboard, characterized in that it is provided with a disconnector interlock device. 3) The disconnector interlock device for a power distribution board according to claim 1 or 2, wherein the desired opening/closing state of the disconnector is a disconnected state of the disconnector. 4) In the disconnector interlock device for a power distribution board according to claim 1 or claim 2, the desired opening/closing state of the disconnector is one set consisting of a pin hole and a lock in the disconnected state, and the desired opening/closing state of the disconnector. and the other set consisting of a pin hole and a lock in a closed state, and one key of the one lock and the other key of the other lock have different shapes and are not compatible. Features: Disconnector interlock device for power distribution board.