JPH019203Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a busbar grounding device used for grounding a busbar in a non-voltage state.

[Technical background of the invention and its problems]

FIG. 1 is a connection diagram showing an example of power distribution in an electric power system. As shown in Fig. 1, a plurality of systems consisting of transformers T1, T2... and power receiving disconnectors A1, A2... are connected between the power transmission line or distribution line L and the bus M, and the system is connected to the bus M. is equipped with a busbar connection switch B. Further, the bus M is provided with a plurality of systems connected to the load 1 via load disconnectors C, and is also provided with a bus grounding device D. This busbar grounding device D is used in inspection work of busbars M and the like. The inspection work is carried out as follows. For example, in Fig. 1, when inspecting the system on the load 1 side from the busbar connection disconnector B, first operate the power receiving disconnector A2 and the busbar connection disconnector B, Next, the busbar grounding device D is turned on to eliminate the electric charge remaining on the busbar M, and then inspection work is performed. Therefore, if the bus grounding device D is turned on while the power receiving shield disconnector A2 and the busbar connection shield disconnector B are turned on, a large current will flow through the bus M, causing an accident in the power system. I will do it. Conventionally, busbar grounding device D
Since a vacuum disconnector, a voltage transformer, a movable disconnector with a buzzer, a lamp, etc. are used in the There was no way to electrically or mechanically disable it. In addition, the same shield disconnectors are used for power reception shield disconnectors A1, A2..., busbar connection shield disconnectors B, load shield disconnectors C, and busbar grounding device D, and they can be replaced. in case of,
There is a risk of accidentally grounding the live bus M. In this way, inspection work for busbars M, etc., can be performed, for example, when increasing the capacity of power plants, etc. In complex systems, there is a particular need to improve their safety.

[Purpose of invention]

This invention was made based on the above circumstances,
When the power receiving shield disconnector and busbar communication shield disconnector that turns on and off the power to the busbar are in a disconnected state, that is, they are not connected to the electric circuit, they can be connected to the busbar and cannot be turned on. It is an object of the present invention to provide a busbar grounding device having the same closing capacity and short-time current capacity as the power receiving and busbar connection shield disconnectors.

[Summary of the idea]

In order to achieve the above object, the present invention is characterized by the following structure. That is, in a busbar grounding device used for grounding a busbar in a non-voltage state, a series circuit of a push button and an interlock magnet coil is provided in parallel to a control circuit that controls a grounding/disconnecting section, and The interlock circuit that interlocks the control circuit has been released because the power receiving circuit disconnector that turns on and off the power to the busbar and the busbar communication circuit disconnector are not connected to the busbar. In case,
By pressing the push button, the intermagnet coil is energized and a lock plate connected to the coil lever of the interlock magnet coil via an interlock auxiliary lever is moved to house the busbar grounding device. The mechanical interlock is released to make the busbar grounding device movable so that it can be connected to the busbar and turned on.

(Embodiment of the invention) An embodiment of the invention will be described below in Figures 2 to 6.
This will be explained with reference to the figures. FIG. 2 is a front view of the busbar grounding device according to the present invention, where 2 is an automatic connection type control circuit disconnection section, and PB is a push button.

FIG. 3 is a side view showing the inside of this device. As shown in FIG.
An upper connecting conductor 5 and a lower connecting conductor 6 electrically connected to the lower main circuits 3 and 4, a grounding/disconnecting section 7 (a vacuum valve is used in this device) for opening and closing the bus bar, and an interlock mechanism 20 to be described later. It is composed of a lock plate 21 and the like.

FIG. 4 is an overview diagram showing an example in which this device is housed in a cubicle 8, where 9 is the device and 10 is a related disconnector, that is, a power receiving disconnector or a busbar connection disconnector. The dovetail buses R, S, and T are turned on and off.

FIG. 5 is a circuit diagram of a control circuit that controls the closing and tripping of the vacuum shutoff switch 7 in this device. A closing control circuit P1-N1, a closing operation circuit P2-N2, and a tripping circuit P3-N3 are provided between the power supply buses P and N of this control circuit.
In the closing control circuit P1-N1, when the coil Y is energized and the conditions for closing the contacts 1a and 1b are satisfied, the coil X is energized and the closing operation circuit P2
-N2 is operated. Closing operation circuit P
2-N2 is for closing the vacuum valve 7 by energizing the operation coil CC when the closing conditions in the closing control circuit P1-N1 are satisfied. The tripping circuit P3-N3 trips the vacuum valve 7 when the conditions for closing the a contacts 3a and 3b are satisfied. IL1 is an interlock circuit that is released when the related disconnector is not connected to the bus, and IL2 is also an interlock circuit that is released when the related disconnector is not connected to the bus. This is an interlock circuit that is released when it is not connected to the bus bar. Then, a new push button is added between the power bus lines P and N of this control circuit.
A series circuit between PB and interlock magnet coil ILM is connected. Here, this interlock magnet coil ILM is activated by a push button when interlock circuit IL2 is released.
It is energized by pressing PB and operates the interlock mechanism shown in FIG.

FIG. 6 is a schematic diagram of the interlock mechanism in this device. As shown in FIG. 6, the interlock mechanism 20 is composed of a lock plate 21, an interlock auxiliary lever 22, an interlock release lever 23, and an interlock lever 24, and is operated by excitation of an interlock magnet coil ILM to lock the lock. The plate 21 is disengaged from a guide groove (not shown), allowing the device to be moved. Here, the interlock release lever 23 is
This is for releasing the interlock of the interlock mechanism 20 by manually rotating it.

Next, the operation of the apparatus configured as described above will be explained. First, if we assume that the disconnectors 10 are connected to the power receiving disconnectors A-1, A-2, etc. and the busbar connection disconnectors B as shown in FIG. 1, then the interlock circuit A signal indicating this is input to IL1 and IL2, and the control circuit shown in FIG. 5 is interlocked by interlock circuits IL1 and IL2. Therefore, the busbar grounding device 9 is interlocked by the lock plate 21 of the interlock mechanism 20, and is in a state in which it is impossible to connect to the busbars R, S, and T in the cubicle 8 shown in FIG.

Next, as shown in FIG. When it is separated from R, S, and T and is in the disconnected position, a signal indicating this is input to the interlock circuits IL1 and IL2. As a result, the interlock of the control circuit is released and the control circuit becomes operable. When the push button PB is pressed, the interlock magnet coil ILM is energized, and the coil lever M1 is raised in the direction of arrow a, as shown in FIG. Rotate it. This locks the lock plate 2.
1 is displaced from a guide groove (not shown), and as shown in FIG. 4, the busbar grounding device 9 becomes movable in the cubicle 8 and is connected to the busbars R, S, and T for grounding.

On the other hand, when the control circuit disconnection section 2 shown in FIG. 2 is not connected to the power source, the lock plate 21 can be removed from the guide groove by manually rotating the interlock release lever 23 shown in FIG. . After this, the busbar grounding device 9 is connected to the busbars R, S, and T and grounded in the same manner as described above.

In this way, in this device, the related disconnector 1
0 is in the closed state, it is mechanically interlocked by the interlock mechanism 20 to make it impossible to move, and relatedly, when the disconnector 10 is in the disconnected position, the interlock of the interlock mechanism 20 is released. Since it is movable, the related disconnector 10
In other words, when the power receiving shield disconnectors A-1, A-2, etc. and the busbar connection shield disconnectors B are in the disconnection position and the busbar is without voltage, the busbar can be grounded, and the busbar etc. can be safely grounded. inspection work can be carried out.

On the other hand, since the grounding/disconnecting section 7 uses a vacuum valve similar to the related disconnector 10, it can have the same closing capacity and short-time current capacity as the related disconnector 10. Therefore, it can be used in place of the power receiving shield disconnector and the busbar connection shield disconnector, and even if replaced, grounding can only be performed when the busbar is in a no-voltage state.

Note that the present invention is not limited to the above embodiment. For example, interlock circuit IL1,
The signal sent to IL2 may be an AND of the signal described in the above embodiment and the signal indicating that there is no bus voltage or the signal indicating that the GPT connection position is present. This increases the conditions for canceling the interlock circuits IL1 and IL2, making it possible to reliably connect the bus grounding device to the bus without bus voltage, thereby improving safety.

[Effect of idea]

According to the present invention, the interlock of the interlock mechanism is released when the power receiving shield disconnector and the busbar connecting shield disconnector are in the disconnected position. Provided is a busbar grounding device that can be connected to the busbar when the device is in the disconnection position, can be connected to the busbar, can be connected, or can be grounded, and has the same closing capacity and short-time current capacity as a power receiving and busbar connection disconnector. can.

[Brief explanation of drawings]

Fig. 1 is a connection diagram showing an example of a power system, Fig. 2 is a front view showing an embodiment of the busbar grounding device according to the present invention, Fig. 3 is a schematic structural diagram showing the internal structure of the device, and Fig. 3 is a schematic diagram showing the internal structure of the device. FIG. 4 is a block diagram showing the inside of a cubicle in which the present device is housed, FIG. 5 is a connection diagram of a control circuit in this device, and FIG. 6 is a schematic block diagram of an interlock mechanism in this device. 3, 4... Upper/lower main circuit, 5, 6... Upper/lower connecting conductor, 7... Earthing/disconnecting section (vacuum valve), 8... Cubicle, 9... Busbar grounding device, 10... Associated disconnector, 20... Interlock mechanism, 21...Lock plate, 22...Interlock auxiliary lever, 23...Interlock release lever, 24...Interlock lever, IL1, IL2...Interlock circuit, PB
…push button, ILM…interlock magnetic coil.

Claims (1)

[Scope of utility model registration request] In a bus grounding device for grounding a bus in which a power receiving shield and disconnector is connected between the power receiving shield and a distribution line etc. and a busbar connecting shield and disconnector is connected in series, the power receiving shield and the bus bar connecting A grounding and disconnecting section that has the same closing capacity and short-time current capacity as the grounding and disconnecting section of the utility disconnector and that opens and closes the bus bar, and a control circuit that controls the closing and tripping of this grounding and disconnecting section;
Interlocking the control circuit when the power receiving shield disconnector and the busbar connecting shield disconnector are in a closed state, and turning on the power receiving shield disconnector and the busbar connecting shield disconnector. a plurality of interlock circuits that release the interlock of the control circuit to enable operation when the interlock is released; a series circuit of a push button and an interlock magnet coil connected in parallel to the control circuit; By excitation of the interlock magnet coil in the series circuit, a lock plate connected to the coil lever of the interlock magnet coil via an interlock auxiliary lever is moved, and a mechanical force is applied to the cupicle housing the busbar grounding device. An interlock mechanism that releases the interlock state and allows the busbar grounding device to be inserted into and removed from the busbar; and an interlock that manually releases the mechanical interlock provided by the interlock mechanism when the busbar is in a no-voltage state. A busbar grounding device characterized by comprising a lock release lever.