JP7246262B2 - Electric operating device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric operating device, and more particularly to a device used as a drive source for opening and closing a contact of a disconnecting switch, opening and closing a grounding device for a disconnecting switch, and the like.

Since the disconnecting switch is opened and closed when the circuit is in a no-load state, it can be opened and closed relatively slowly unlike a circuit breaker or the like which operates instantaneously. Similarly, the engagement/release motion of the grounding device is relatively slow. A direct-current magnet motor is used as a drive source for rotating the main shaft for opening and closing the contacts and operating the blades of the grounding device to perform closing/opening operations. In addition, this type of electric operation device is characterized by a function to apply a brake at an appropriate timing before the end of operation and a function that can be easily manually operated after the motor stops driving in order to reduce the impact on the equipment when the operation is completed. It is necessary to have a manual operation function that can be operated.

FIG. 1 shows an example of a circuit configuration of an electric operating device using such a magnet motor 1 as a drive source. As shown in the figure, an energization circuit for energizing the armature 1a of the magnet motor 1 of the drive source (forward rotation opening and closing by the second contact C2, reverse rotation opening and closing by the sixth contact C6 and the seventh contact C7) ), a short circuit 2 for forming a closed circuit by shorting both ends of the armature (opening and closing by the fourth contact C4, the fifth contact C5, and the eighth contact C8), and a control for controlling the opening and closing of each contact. A circuit 3 is provided.

As a result, for example, by energizing the current-carrying circuit with the short circuit 2 open, the rotor of the magnet motor 1 is rotated, the rotational force is transmitted to the main shaft, and the contact of the disconnecting switch or the grounding device for the disconnecting switch is opened and closed. or actuate the blades of the grounding device. Since the magnetic field side of the magnet motor 1 is a permanent magnet, a magnetic force is always generated. Therefore, when the short circuit 2 is closed while the armature is rotating, dynamic braking is generated. It reduces the impact on the equipment.

As an example of such control, the control circuit closes the second contact C2 and the eighth contact C8 and opens the fourth contact C4 at the start of normal rotation driving, and closes the second contact C2 during the period when braking is required before the end of driving. is opened, and the fourth contact C4 and the eighth contact C8 are closed. That is, the auxiliary relay 3b is connected to the main circuit 3a via the closing electromagnetic contactor 3c. The closing electromagnetic contactor 3c is a normally open contact, and when the control signal S6 from the main circuit 3a is turned ON, the contact is closed and the auxiliary relay 3b is energized. This energization causes the fifth signal S5 output from the auxiliary relay 3b to turn from OFF to ON, closing the eighth contact C8.

On the other hand, in this state, if the manual operation of rotating the main shaft by operating the operation handle is attempted after the end of the operation by the electric operation, the armature will rotate, and accordingly the short circuit 2 will generate a braking force due to dynamic braking. It becomes impossible to perform smooth manual operation because a large force is required to rotate it. Therefore, in the device disclosed in Patent Document 1, the control circuit performs control to open the eighth contact C8, which is the contact of the auxiliary relay 3b, after the end of driving. That is, when the closing electromagnetic contactor 3c is closed, the auxiliary relay 3b is energized, the fifth signal S5 is turned ON, and the eighth contact C8 is closed, when the control signal S6 is turned OFF, the closing electromagnetic contactor 3c opens, and the auxiliary relay 3b is de-energized. As a result, the coil voltage applied to the electromagnetic contactor coil of the auxiliary relay 3b is also turned OFF, and the fifth signal S5 is also turned OFF. Therefore, the eighth contact C8 is opened.

Furthermore, the resistor 3d is connected in parallel with the auxiliary relay 3b that outputs the fifth signal S5 for opening and closing the eighth contact C8. By providing this resistor 3d, the duration of braking is extended. That is, after the auxiliary relay 3b is deenergized and the coil voltage is turned OFF, there is a certain time delay before the fifth signal S5 is actually turned OFF and the eighth contact C8 transitions from ON to OFF. Since the resistor 3d is connected in parallel with the auxiliary relay 3b, when the closing electromagnetic contactor 3c is opened, a closed loop is formed by the electromagnetic contactor coil of the auxiliary relay 3b and the resistor 3d. The coil energization time is extended by the back electromotive force generated when the magnetic contactor coil is cut off, and as a result, the time from when the coil voltage is turned off to when the fifth signal S5 is actually turned off and the eighth contact C8 is opened. can be made longer than when the resistor 3d is not provided.

As a result, the short circuit 2 is opened, and even if the armature rotates, the dynamic braking circuit is not formed, and manual operation becomes possible. That is, when an operator operates a manual handle (not shown) to rotate the main shaft, the armature linked thereto is also rotated. However, since the short circuit 2 is open, dynamic braking does not occur, and rotation can be performed with a small force.

Japanese Unexamined Patent Application Publication No. 2012-209060

As described above, in the conventional electric operation device using a magnet motor, the short circuit 2 is used as a drive source to enable manual operation after applying a brake by dynamic braking by the short circuit 2 during electric operation. An auxiliary relay shall be provided for opening. That is, an auxiliary relay 3b and a resistor 3d are provided in the control circuit, and the short circuit 2 is provided with an eighth contact C8 in series with the other contacts. Therefore, a complicated circuit is required, and the wiring process becomes complicated. Furthermore, the cost increases due to an increase in the number of parts. Furthermore, the control circuit becomes complicated because the control circuit issues a command to the auxiliary relay at an appropriate timing.

In some grounding devices, the blade rotates forward and backward in a vertical plane with the lower end as the center of rotation, or the blade stored in a box moves up and down. In the type in which the blade moves up and down, the blade is normally housed in a box and rises when it touches the ground. When manually operating the blade, it is necessary to rotate the operating handle to raise or lower the blade, but the blade is heavy. It is dangerous because it may suddenly move downward and the operating handle may also rotate in the opposite direction. Therefore, in order to suppress such abrupt downward movement, conventionally, for example, a worm gear is provided at a predetermined position of the power transmission system for elevating the blade so that it does not rotate in the reverse direction even if the operating handle is released. Such a complicated gear structure is required, and there is also a problem that the size of the device is increased and the cost is increased.

The above-described problems are described as independent ones, and the present invention does not necessarily have to be able to solve all of the described problems, and it is sufficient if at least one of the problems can be solved. In addition, we intend to obtain the right for the configuration to solve this problem by filing a divisional application or making an amendment.

In order to solve the above-described problems, the present invention provides (1) an electric operating device used for a disconnecting switch or a grounding device for the disconnecting switch, which uses a magnet motor as a drive source and energizes an armature of the magnet motor. a conducting circuit for conducting both ends of the armature to form a closed circuit; a conducting contact for opening and closing the conducting circuit; and a conducting contact for opening and closing the conducting circuit. and control means for controlling opening and closing of the conducting contact and the conducting contact, wherein the conducting contact and the resistor are arranged in series, and the controlling means closes the conducting contact upon start of operation. and a function of closing the contact for conduction in a period in which braking is required before the end of the operation. In the case of slow rotation due to manual operation, the braking force of the power generation braking generated due to the rotation of can be manually rotated, and in the case of fast rotation that is not manual operation, the fast rotation is suppressed , The disconnecting switch grounding device has a blade that moves up and down, and when the armature rotates at a high speed when the blade in an upper position is manually operated to drop due to its own weight, the fast rotation is suppressed. It has a damper effect that
By doing so, the braking force generated by the dynamic braking generated during manual operation is small, and manual operation becomes possible. On the other hand, for example, the number of revolutions of the armature during electric operation is higher than that during manual operation, so the braking force due to dynamic braking is large. Therefore, in order to reduce the impact on the device when the electric operation is completed, the brake can be applied with a large braking force before the completion of the operation. And, by using a magnet motor as a drive source, it is possible to stably supply a low-cost, small-sized device.
(2 ) The resistor may be configured by connecting a plurality of resistor elements in parallel. In this way, even if one resistance element is damaged and becomes open, a desired braking force can be exerted.
( 3 ) It is preferable that the energizing contact is a normally open contact and the conducting contact is a normally closed contact.

In the present invention, while using a magnet motor as a drive source, it is possible to exhibit a braking function before the end of operation and a manual operation function after the end of operation. Also, a damper effect can be exhibited without the necessity of equipping a braking device.

FIG. 2 is a diagram showing part of a circuit configuration in a conventional electric operating device; It is a figure which shows an example of the disconnecting switch by which the electric operating device which concerns on this invention is mounted. 1 is a front view showing a preferred embodiment of an electric operating device according to the present invention; FIG. It is the top view. 3 is a diagram showing part of the circuit configuration in the electric operating device of the present embodiment; FIG. FIG. 5 is a diagram showing another example of a grounding device for a disconnecting switch on which the electric operating device according to the present invention is mounted; FIG. 10 is a diagram showing another example of a disconnecting switch on which the electric operating device according to the present invention is mounted; It is a figure which shows an example which shows the main axis|shaft of a drive motor, and a manual axis|shaft.

An embodiment of the present invention will be described in detail below with reference to the drawings. It should be noted that the present invention is not to be construed as being limited to this, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

FIG. 2 shows an example of a disconnecting switch 10 installed in an ultra-high voltage substation in which an electric operating device, which is a preferred embodiment of the present invention, is installed. A conductive part of the disconnecting switch 10 is installed on the top of an insulator device 12 erected on a frame 11 installed on the ground. The insulator device 12 is configured by assembling three legs formed by connecting a plurality of insulators 12a in series like a tower.

The conductive portion of the disconnecting switch 10 installed on the top of the insulator device 12 includes a hinge portion 13 rotating at the top, a horizontally extending butt-side blade 14 connected to the hinge portion 13, and the butt-side blade 14 It has a cylindrical main contact portion (butt) 15 and a shield ring 16 which are attached to the tip of the and extend vertically. The bat-side blade 14, the main contact portion 15 and the shield ring 16 rotate together as the hinge portion 13 rotates. The hinge portion 13 rotates in forward and reverse directions upon receiving force from a drive source such as a compressor and a drive motor.

In FIG. 2, only one of the upstream side and the downstream side of the system for one phase is shown. Furthermore, they are installed for three phases. It should be noted that the main contact portion of the counterpart constituting the pair has a bifurcated shape, and the rod-like main contact portion 15 enters into the bifurcated main contact portion (fingers) to electrically connect the two. By rotating the hinge portion 13 forward and backward, the paired main contact portions 15 are connected to each other and the contact of the disconnecting switch is turned on, or separated to be turned off. Since the basic configuration of the conductive portion of this disconnecting switch is the same as the conventional one, its detailed description is omitted.

A grounding device 20 is arranged side by side with the disconnecting switch 10 . This grounding device 20 grounds the overhead wire connected to the hinge portion 13, the blade 14, the main contact portion 15, and the terminal block of the disconnecting switch 10, which has been turned off. That is, the hinge portion 13, the blade 14, the main contact portion 15, and the overhead wire connected to the terminal block, which are in the disconnected state, are floating in the air. Therefore, the circuit is stabilized by grounding with the grounding device 20 . It should be noted that, in practice, the main contact portion 15 is not directly contacted, but is electrically connected to a terminal block or the like on the hinge portion 13 .

The grounding device 20 includes a fixed contact portion 23 attached to the hinge portion 13 side of the disconnecting switch 10, a metal (conductive) blade that contacts and separates from the fixed contact portion 23, and an electric operation that moves the blade. Equipped with equipment, etc. The blade consists of a hoisting blade 21 that rotates within an angle range of 90 degrees (taking a standing posture and a lying posture) with the lower end as the center of rotation, and an extendable blade 22 that is connected to the upper end of the hoisting blade 21 and expands and contracts in the axial direction. Prepare. The undulating blade 21 is grounded by a lead wire or the like (not shown) directly to the ground or by being connected to a ground conductor. As shown in the figure, when the hoisting blade 21 is erected and the telescopic blade 22 is extended, the distal end of the telescopic blade 22 is connected to the fixed contact portion 23 and conducts. Therefore, since the fixed contact portion 23 is electrically connected to the hinge portion 13 and the main contact portion 15 of the disconnecting switch 10 , the main contact portion 15 is grounded via the extendable blade 22 and the undulating blade 21 . On the other hand, as indicated by the chain double-dashed line in the drawing, when the retractable blade 22 is contracted and the hoisting blade 21 is overturned, the distal end of the retractable blade 22 and the fixed contact portion 23 are separated from each other. Therefore, the disconnecting switch 10 is released from the grounded state.

The electric operating device 26 to which the present invention is directed rotates (raises) the hoisting blade 21 in a vertical plane. That is, a connecting rod 25 is connected to an operating shaft 26a that is the output of an electric operating device 26, a link mechanism 24 is connected to the upper end of the connecting rod 25, and the electric operating device 26 is connected to the hoisting blade 21 via the link mechanism 24. transmit the output of As a result, the undulating blade 21 rotates in forward and reverse directions with the lower end as the center of rotation. The expansion and contraction operation of the expansion and contraction blade 22 is also performed by the power of the expansion and contraction motor 27 provided separately. The operation of such blades (the luffing blade 21 and the extendable blade 22) will be described later.

FIG. 3 shows one embodiment of the power operating device 26 . The electric operation device 26 has a rectangular mechanism box 30 whose front surface is open and a front door 31 is attached to the front surface. Since only the front side of the mechanism box 30 is open, the electrical component panel 32 mounted with relays, the terminal block 33, and the like are arranged on the front side inside the mechanism box 30 . The electrical component panel 32 is constructed by consolidating main relays into a single panel. Therefore, part replacement is facilitated. In this embodiment, since only one side is open as described above, it is sufficient to secure a working space for maintenance on the front side.

A drive motor unit 35 is arranged at a predetermined position of the mechanism box 30 . The drive motor unit 35 adopts a configuration in which a drive motor 36 and a speed reducer section 37 are integrated and housed in one case.

At a predetermined position on the top surface of the mechanism box 30, an operation shaft 26a is arranged in a state of protruding to the outside. The power of the drive motor unit 35 is directly transmitted to the operating shaft 26a, and the operating shaft 26a performs reciprocating horizontal rotation of 190 degrees. Further, when the operation shaft 26a rotates 190 degrees, the rotation angle is restricted by the lock mechanism 38 and the position is held. Further, by connecting a manual handle (not shown) to the operating shaft 26a and rotating the manual handle around the operating shaft 26a, the operating shaft 26a can be rotated forward and backward within a predetermined angle range. These configurations can basically adopt the same configurations as conventional ones.

The drive motor 36 is composed of a magnet motor. In other words, the magnetic field generated by the permanent magnets forming the magnetic field is constantly applied to the armature 36a. In order to reduce the impact on the equipment when the operation is completed, the electric operation device needs to have a function of applying a brake before the completion of the operation and a manual operation function that allows easy manual operation. A circuit for realizing these two functions is as follows.

FIG. 5 shows part of a circuit in an electric operating device that uses a drive motor 36 using a magnet motor as a drive source. As shown in FIG. 5, the armature 36a of the drive motor 36 is connected to the power supply line via a first contact C1 and a second contact C2 which are connected in series to both ends of the armature 36a. A circuit for energizing the armature 36a via the second contact C2 is a forward rotation circuit. Since the drive motor 36 of this embodiment is a magnet motor, the magnetic force generating source for the magnetic field is a permanent magnet, which is not shown in this circuit diagram.

On the other hand, one terminal of the armature 36a of the drive motor 36 is connected to the first contact C1 and the second contact C2 connected to the other terminal side of the armature 36a via the sixth contact C6. The other terminal of the armature 36a is connected to the first contact C1 and the second contact C2 connected to one terminal of the armature 36a through the seventh contact C7. These sixth contacts C6. A circuit for energizing the armature 36a via the seventh contact C7 serves as a circuit for reverse rotation.

It also has a conduction circuit 40 for conducting both ends of the armature 36a. In this conducting circuit 40, a fourth contact C4, a fifth contact C5, and a resistor 40a are arranged in series. Therefore, when all of the fourth contact C4 and the fifth contact C5 are closed, a closed circuit is formed between both terminals of the armature 36a via the conduction circuit 40, which is an external circuit, and when at least one contact is opened, the electric A non-conducting state is established between both terminals of the element 36a.

Each of these contacts is configured using, for example, an electromagnetic contactor. The opening/closing control of each contact is performed based on the control signal from the control circuit 41 . That is, the control circuit 41 is composed of, for example, a relay circuit that utilizes the timing difference of the electromagnetic contactor operation, and is output from three signals, the first signal S1, the second signal S2, and the fourth signal S4, and each signal is appropriately ON/OFF at the timing of The first signal S1 controls the opening and closing of the first contact C1, the second signal controls the second contact C2 and the fourth contact C4, the fourth signal S4 controls the fifth contact C5, the sixth contact C6 and the fourth contact C5. It controls the opening and closing of the seven contacts C7. FIG. 5 shows the state of each contact when each signal is OFF. That is, for example, the fourth contact C4 and the fifth contact C5 are normally closed contacts that open when the signal is ON, and the other contacts are normally open contacts that open when the signal is OFF. When the signal turns ON, the open/close state of the corresponding contact is reversed. The output timing of the control signal output from the control circuit 41 is as follows.

When the control circuit 41 receives an operation command for forward rotation by pressing an operation switch button (not shown) or a command from a remote control panel, the control circuit 41 turns on the first signal S1 to close the first contact C1, and the second contact C1 is closed. The signal S2 is turned ON to close the second contact C2. Further, the fourth contact C4 is opened with the ON of the second signal S2. As a result, the short circuit 4 is opened. In this state, the fourth signal S4 remains OFF, and the sixth contact C6 and the seventh contact C7 are opened. As a result, the terminals of the armature 36a are not short-circuited, the armature 36a is energized by the forward rotation circuit, and the magnetic field by the permanent magnets is constantly working, so the drive motor 36 starts operating.

The control circuit 41 turns off the second signal S2 after a certain period of time has elapsed since the start of operation. Along with this, the second contact C2 is opened to cut off the energization of the armature 36a, and the fourth contact C4 is closed. As a result, the conduction circuit 40 establishes conduction between both terminals of the armature 36a. The armature 36a constitutes a closed circuit through the conduction circuit 40. FIG. Since the electromagnetic force generated by the permanent magnets is constantly acting, the rotation of the armature 36a generates dynamic braking and brakes. As a result, the rotation speed of the drive motor 36 is reduced, and the impact on the equipment at the end of the operation is reduced.

On the other hand, when the control circuit 41 receives an operation command for reverse rotation by pressing an operation switch button (not shown), it turns on the first signal S1, turns on the fourth signal S4, and keeps the second signal S2 off. and When the fourth signal S4 is turned ON, the sixth contact C6 and the seventh contact C7 are closed, the reverse rotation circuit energizes the armature 36a in the direction opposite to that during forward rotation, and the drive motor 36 starts rotating in the reverse direction. . Other control operations are the same as those during forward rotation described above.

In this embodiment, since the conductive circuit 40 is closed even during the stop after the rotation operation is completed, for example, the operator tries to perform the manual operation at an appropriate timing after the rotation has stopped, and the illustration is omitted. When the manual handle is operated to raise and lower the luffing blade and the armature 36a rotates accordingly, dynamic braking occurs according to the rotation speed.

Here, in the present embodiment, instead of the conventional short circuit, the conduction circuit 40 is made up of the series circuit of the fourth contact C4, the fifth contact C5, and the resistor 40a. Since the current value flowing through the conductive circuit can be adjusted, the influence of the magnetic force on the field side can be adjusted, and even if dynamic braking occurs, manual operation can be suppressed. In other words, the resistance value of the resistor 40a is moderately braked near the end of the electric operation, and the operation is completed. value. The resistance value is not a very small resistance value (for example, about several ohms) that constitutes a short circuit, but is preferably equal to about 5 times the armature coil resistance, more preferably within a range of 10 to 20 times. should be set as a guideline.

Moreover, the braking force of the dynamic braking generated by the rotation of the armature 36a when the conduction circuit 40 is in the conduction state also changes according to the rotational speed of the armature 36a. Therefore, when the operating handle is slowly rotated by manual operation, the braking force generated by the dynamic braking is also small, and even in view of this point, manual operation is possible in the state in which the conductive circuit 40 is conductive.

As described above, according to the present embodiment, the electric operation device can be manually operated even when the conduction circuit 40 is in a conductive state due to electric operation. In addition, compared with the conventional electric operation device shown in FIG. 1, circuits such as the auxiliary relay 3b, the closing electromagnetic contactor 3c, the resistor 3d, etc., which are indispensable for manual operation, are no longer required, thereby saving space and wiring. simplification and cost reduction. Furthermore, the elimination of these circuits eliminates the need for a processing step for opening and closing the eighth contact provided in the short circuit, thereby simplifying the control.

It should be noted that the control circuit 41 turns off the first signal S1 when a failure occurs, an abnormality occurs, or the like. As a result, the first contact C1 is opened, the power supply to the drive motor 36 is forcibly interrupted, and an emergency stop can be performed.

Furthermore, as described above, the control circuit 41 of this embodiment is formed by a relay circuit that utilizes the timing difference between the operations of the electromagnetic contactor. As shown in FIG. 5, the control circuit 41 has a function of outputting the first signal S1, the second signal S2 and the fourth signal S4. Although the specific relay circuit configuration of the control circuit 41 is omitted, this control circuit 41 is the same as the control signal output by the conventional main circuit 3a shown in FIG. Since it is only necessary to output, a circuit similar to that of the main circuit 3a can be applied. In this way, the control circuit 41 can utilize conventional sequences and its operation is guaranteed.

Figures 6 and 7 show another type of embodiment of the disconnecting switch and the grounding device implemented therein. In this embodiment, the disconnecting switch 10 includes a single insulator device 12 (only one side of the insulator device 12 is shown in the figure and the other side is omitted) one side of which stands vertically on the mount 11. , a conductive portion is arranged on the top of the insulator device 12 thereof.

In addition, the grounding device 20 has a blade 51 normally housed in the box 50 which is driven by the electric operation device 26 and rises, and the upper end of the blade 51 is electrically connected to the conductive portion. When the contact portion 52 is contacted, the conductive portion is grounded via the blade 51 (see FIG. 7). Further, when the electric operating device 26 is reversely driven in such a grounded state, the blade 51 descends and the upper end of the blade 51 separates from the grounding terminal 52 and is housed in the box 50 .

The electric operation device 26 mounted in such a type also uses a magnet motor as a drive source as in the above-described embodiment, and includes a fourth contact C4, a fifth contact C5 and a resistor connected in series so as to connect the armature 36a. 40a is provided with a conductive circuit 40 and the like, and has an electric operation function and a manual operation function. When the blade 51 is lifted and retracted using the manual operation function, the operation handle is turned while the blade 51 is heavy. Then, the blade 51 tries to move downward rapidly by its own weight. Then, the rotation speed of the armature 36a rapidly increases, and the braking force generated by the dynamic braking also rapidly increases. Such a large braking force suppresses the rotation of the armature 36a, slows down the falling speed of the blade 51, and exerts a damper effect of suppressing abrupt reverse rotation of the operating handle.

As described above, the resistance value of the resistor 40a provided in the conducting circuit 40 exerts a braking force to the extent that the armature 36a can be manually rotated when the armature 36a rotates slowly as in normal/normal manual operation as described above. However, when the armature 36a rotates at a high speed, the resistance value should be set so that a large amount of braking is applied to prevent high-speed rotation. The above-described embodiment satisfies these conditions.

Furthermore, the electric operation device 26 generates a predetermined braking force even during manual operation, and the magnitude of the generated braking force corresponds to the rotation of the armature. While enabling operation, it is possible to suppress sudden rotation due to external factors and to exhibit a damper effect.

By adopting such a configuration, there is no need to provide a worm gear as in the prior art. For example, as shown in FIG. By adopting this, for example, the manual shaft 55 rotates as an operation handle (not shown) that cooperates with the manual shaft is rotated, and the main shaft 36b can be rotated by receiving the rotation. Therefore, the configuration is also simplified in this respect, and the size of the device can be reduced.

Furthermore, the resistor 40a used in the above-described embodiment is preferably configured by connecting a plurality of resistance elements in parallel, and the number of the plurality of resistors is preferably large. For example, if a single resistive element is used, if the resistive element breaks and the circuit becomes open, braking force will not be generated, and smooth stopping during electric operation and damping effect during manual operation will not be exhibited. Therefore, it is preferable that a plurality of resistance elements are connected in parallel so that a desired braking force can be exerted even if one of them is damaged.

Further, when a plurality of resistance elements are connected in parallel in such a manner, the resistance value of the resistor 40a increases if some of the resistance elements are damaged and become open. Since the possibility that a plurality of resistive elements are damaged at the same time is extremely low, the resistance value of the resistor 40a when all the resistive elements are normal and the resistance value when one is damaged, for example, It is preferable that the resistance value is within the range of the above-described embodiment, and an appropriate braking force is exerted both during electric operation and during manual operation.

In addition, if one resistance element is damaged or the like, even if it is out of the above-mentioned appropriate range, a certain degree of braking force will be exerted unless the conductive circuit 40 is opened. In either case, the resistance value of the resistor 40a does not have to be set within the desired range, but it is more preferable to be set so that both are within the desired range.

[Modification]
In the above-described embodiment, the control circuit 41 is configured by a relay circuit, but the present invention is not limited to this. Alternatively, all of them may be controlled by various timers, and may be realized by various configurations.

Further, in the above-described embodiment, the fourth contact C4, the fifth contact C5, and the resistor 40a are arranged in series in the conducting circuit 40. FIG. This is because there are fewer changes to the configuration of the conventional electric operating device, the existing device can be easily replaced, and the reliability of the operation can be obtained. On the other hand, when newly installed, it is not always necessary to arrange each contact in series in the conduction circuit 40. For example, when the operation starts, the contact is opened to open the conduction circuit, and the braking is required before the end of the operation. It is preferable to control so that the contact is closed and the conductive circuit forms a closed circuit.

[Other uses]
In the above-described embodiment, an example of application to the electric operating device 26 of the grounding device has been shown, but the present invention is not limited to this, and may be applied to a drive source for opening and closing operations of disconnectors. The operation of the grounding device and the disconnecting switch contact are different, but the operation of the electric operating device is the same. In addition, the installation location is not limited to the ultra-high voltage substation shown in the embodiment, and may be installed in various locations such as a substation with a voltage class lower than that, a switching station, etc., as long as it is a location with a DC power supply. Applicable.

10: disconnecting switch 20: grounding device 21: hoisting blade 22: telescopic blade 23: fixed contact portion 26: electric operation device 26a: operating shaft 36: drive motor 36a: armature 40: conduction circuit 40a: resistor 41: control circuit 50: Box 51: Blade 52: Contact for grounding

Claims (3)

An electric operating device used for a disconnecting switch or a grounding device for a disconnecting switch,
Using a magnet motor as a drive source,
an energizing circuit for energizing the armature of the magnet motor;
a conduction circuit for forming a closed circuit by conducting both ends of the armature;
an energizing contact for opening and closing the energizing circuit;
a conducting contact for opening and closing the conducting circuit;
Control means for controlling opening and closing of the conducting contacts and the conducting contacts;
with
the conducting contact and the resistor are arranged in series,
The control means has a function of closing the energizing contact upon start of driving, and a function of closing the conducting contact during a period in which braking is required before the end of driving,
The resistance value of the resistor can be manually rotated when the braking force of the dynamic braking generated with the rotation of the armature in the state where the conductive circuit constitutes a closed circuit is slow rotation due to manual operation, In the case of fast rotation that is not manual operation, the fast rotation is suppressed,
The disconnecting switch grounding device has a blade that moves up and down,
When the blade in the upper position is manually operated to drop due to its own weight and the armature rotates at a high speed, a damper effect that suppresses the fast rotation is exhibited. operating device. 2. The electric operating device according to claim 1, wherein the resistance is configured by connecting a plurality of resistance elements in parallel. 3. The electric operating device according to claim 1, wherein the conducting contact is a normally open contact and the conducting contact is a normally closed contact.

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