JP2012209060A - Electric operator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a product quality by dispensing with a clutch mechanism which is a component whose frequency in occurrence of failure is highest among components constituting an electric operator.SOLUTION: An electric operator 26 causes undulation operation on an undulation blade of a grounding apparatus for an isolator. A drive motor unit 40 is integrated with a motor part 43 equipped with a torque motor which is an AC motor as well as a speed reduction unit part 44. Relating to a torque characteristic against a rotational speed of the torque motor, a maximum torque is outputted in a low speed rotation range, and the maximum torque is set to be such a value as not to damage the isolator or the grounding apparatus for the isolator, to eliminate the need for the crutch mechanism.

Description

  The present invention relates to an electric operating device, and more particularly to an apparatus used as a driving source for opening / closing a contact of a disconnector or a grounding device for a disconnector.

  The grounding device attached to the disconnector includes a fixed contact portion attached to the main body of the disconnector, a blade that contacts and separates from the fixed contact portion, and an electric operation device that moves the blade. The blade includes an undulating blade that rotates within an angle range of 90 degrees (with a standing posture and a tilted posture) with the lower end as a rotation center, and an extendable blade that is connected to the upper end of the undulating blade and expands and contracts in the axial direction. The electric operating device to which the present invention is directed is for rotating (raising and lowering) an undulating blade.

  Since the disconnector is opened and closed in a non-voltage state, it can be opened and closed relatively slowly unlike a circuit breaker or the like. Similarly, the turning-on / opening operation of the grounding device is performed relatively slowly. The above-described rotating operation of the undulating blade is performed several times a year, and as a driving source, a conventional compressor has been used, but thereafter, the motor has been changed to use a motor as a driving source. For example, in a 550 kV substation, there is an AC power source because workers are resident, so an AC motor is used as the motor. This eliminates the need for a separate DC power supply.

  FIG. 8 shows a main part of a conventional electric operating device. In this electric operating device, a drive gear 2 is connected to an output shaft 1 a of a drive motor 1, and a speed reducer 4 composed of a plurality of gears 3 is linked to the drive gear 2, and the output of the speed reducer 4 is controlled by an operation shaft 6. It becomes. Further, a clutch mechanism 5 is interposed in the middle of the speed reducer 4. The operation shaft 6 is linked to the hoisting blade via a predetermined link mechanism. The drive motor 1 is a motor that can rotate forward and backward. When the drive motor 1 rotates forward and backward, the operating shaft 6 rotates forward and backward within a predetermined angle range, and the undulating blade rises / falls. This type of electric operating device is disclosed in Patent Document 1, for example.

  Further, the drive motor 1 uses an AC ordinary squirrel-cage induction motor. The torque characteristics with respect to the rotation speed of the ordinary squirrel-cage induction motor are as shown by dotted lines in FIG. As shown in the figure, the output torque gradually decreases as the rotational speed increases, then reverses and rises, reaches a very large maximum torque of 2.5 times the rating, and then decreases toward the output 0. . Since the output torque is low during low-speed rotation, if the motor is configured so that a constant torque can be obtained even in the low-speed rotation region, a torque larger than necessary is output in the high-speed rotation region. An area occurs. Therefore, if the output torque in the high-speed rotation region is directly applied to the power transmission system including the link mechanism of the undulating blade, the apparatus may be damaged. Therefore, in order to prevent the occurrence of such breakage, the conventional electric operating device arranges the clutch mechanism 5 as described above to cut an unnecessary torque region (region indicated by hatching in FIG. 9).

Japanese Utility Model Publication No. 64-18553

  As described above, it is essential to use the clutch mechanism in the conventional electric operation device using the ordinary squirrel-cage induction motor. Therefore, the following various problems occur. First, the clutch mechanism is difficult to assemble, and adjustment and maintenance after installation becomes complicated. Furthermore, the clutch mechanism is the part that causes the most troubles among the parts constituting the electric operation device, and the existence of the clutch mechanism is a bottleneck for maintaining product quality.

  Further, since the clutch mechanism 5 needs to be maintained and managed, the clutch mechanism 5 is easily operated from the outside. That is, the clutch mechanism 5 is arranged separately from the drive motor 1 and exposed. Furthermore, since the clutch mechanism 5 is disposed in the middle of the reduction gear 4 composed of a plurality of gears 3, the gear 3 also needs to be exposed to the outside. The gears 2 and 3 inject grease into the meshing teeth, but since the gears 2 and 3 are exposed to the outside, the grease is quickly dried and also has dust adhering. There is also a problem that needs to be cleaned.

  In order to solve the above-mentioned problems, the present invention is (1) an electric operating device used for a disconnector or a grounding device for a disconnector, and is linked to a torque motor that is an AC motor and an output of the torque motor. The torque characteristic with respect to the rotational speed of the torque motor is such that the maximum torque is output in the low-speed rotation region, and the maximum torque is large so as not to damage the disconnector or the disconnector grounding device. It was decided to be set.

  The maximum torque of the torque motor is set so as not to damage the disconnector or disconnector grounding device with which the output of the torque motor and thus the electric operating device is linked. A clutch mechanism is not required, so that the torque motor output decelerated by the reduction gear can be provided to the disconnector / disconnector grounding device. As a result, the mechanism is simplified, and the clutch mechanism which is the part with the highest degree of failure occurrence among the parts constituting the electric operating device is eliminated, so that the product quality is improved. Furthermore, since the stall characteristic is good and the maximum torque is output in the low-speed rotation region, it is possible to continuously output a desired torque without any problem even if the motor rotation speed falls, and to suppress the motor stall.

  Since the torque motor is an AC motor, it operates using an AC power source. Therefore, in a place where an electric operating device that is operated by a conventional AC ordinary squirrel-cage induction motor is installed, such as a 550 kV substation, the existing electric operating device can be replaced with the electric operating device of the present invention. Easy to do. Needless to say, this can be applied to newly installed substations.

  (2) The torque motor and the speed reducer may be housed in the same case. If it does in this way, a torque motor and a reduction gear will become one component, and the assembly in an electric operating device can be performed easily. In addition, since the gears that make up the reduction gear are housed and protected in the case, it is possible to prevent the grease injected between the gears from drying out and adhere to dust as much as possible. The cycle to do can be lengthened.

  (3) In the torque characteristics, the rate of change in which the output torque decreases constantly or gradually as the rotational speed increases in the low-speed rotation region, and the output torque decreases as the rotational speed increases in the high-speed rotation region. It is good to set larger than the rate of change in the low-speed rotation region. In this way, an output close to the maximum torque can be maintained in the low-speed rotation region, and a stable operation can be performed.

  In the present invention, the clutch mechanism which is the part with the highest degree of malfunction among the parts constituting the electric operating device is not required, so that the product quality is improved.

It is a figure which shows an example of the disconnector with 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 side view. It is a perspective view which shows a drive motor. It is a figure explaining an effect | action. It is a figure explaining an effect | action. It is a figure which shows a prior art example. It is a figure which shows the torque characteristic with respect to the rotational speed of the drive motor of this invention product and a conventional product.

  FIG. 1 shows an example of a disconnector 10 installed in a 550 kV substation in which an electric operating device according to a preferred embodiment of the present invention is mounted. The conductive part of the disconnector 10 is installed on the top of the insulator device 12 erected on the mount 11 installed on the ground. The lever device 12 is configured by assembling three legs formed by connecting a plurality of levers 12a in series like a tower.

  The conductive portion of the disconnector 10 installed on the top of the lever device 12 includes a hinge portion 13 that rotates at the apex, a bat side blade 14 that is connected to the hinge portion 13 and extends in the horizontal direction, and the butt side blade 14. A cylindrical main contact portion (bat) 15 and a shield ring 16 that are attached to the tip of the column and extend vertically. The butt-side blade 14, the main contact portion 15, and the shield ring 16 rotate as the hinge portion 13 rotates. The hinge portion 13 rotates forward and backward in response to a force from a drive source such as a compressor.

  In FIG. 1, only one of the upstream side or the downstream side of the system for one phase is shown, and the configuration of the disconnector shown in the figure is also arranged on the opposite side to form one phase. Furthermore, they are installed for three phases. The mating main contact portion constituting the pair has a bifurcated shape, and the rod-shaped main contact portion 15 enters the bifurcated main contact portion (finger) so that they are conducted. And when the hinge part 13 rotates forward / reversely, the main contact parts 15 which become a pair are connected, and the contact of a disconnecting switch will be in an on state, or it will separate and will be in a cutting state. Since the basic configuration of the conductive portion of this disconnector is the same as that of the prior art, its detailed description is omitted.

  A grounding device 20 is disposed alongside the disconnector 10. The grounding device 20 grounds the hinge portion 13, the blade 14, the main contact portion 15, and the overhead wire connected to the terminal block of the disconnector 10 that has been cut off. In other words, the hinge part 13, the blade 14, the main contact part 15, and the overhead wire connected to the terminal block in the cut state are in a floating state in the air. Therefore, the grounding device 20 is grounded to stabilize the circuit. Actually, the main contact portion 15 is not directly contacted but is conducted to a terminal block or the like in the hinge portion 13.

  The grounding device 20 includes a stationary contact portion 23 attached to the hinge portion 13 side of the disconnector 10, a metal (conductive) blade that contacts and separates from the stationary contact portion 23, and an electric operation that moves the blade. Equipment and the like. The blade includes an undulating blade 21 that rotates within an angle range of 90 degrees (with a standing posture and a tilted posture) with the lower end as a rotation center, and an extendable blade 22 that is connected to the upper end of the undulating blade 21 and expands and contracts in the axial direction. Prepare. The hoisting blade 21 is connected to the ground or connected to the ground conductor by a lead wire (not shown) to be grounded. As shown in the figure, when the undulating blade 21 stands and the extension blade 22 extends, the tip of the extension blade 22 is connected to the fixed contact portion 23 to conduct. Therefore, since the fixed contact portion 23 is electrically connected to the hinge portion 13 and thus the main contact portion 15 of the disconnector 10, the main contact portion 15 is grounded via the telescopic blade 22 and the undulating blade 21. On the other hand, as shown by a two-dot chain line in the figure, when the stretchable blade 22 contracts and the undulating blade 21 falls, the tip of the stretchable blade 22 and the fixed contact portion 23 are separated from each other. Therefore, the grounding state of the disconnector 10 is released.

  The electric operating device 26 targeted by the present invention rotates (raises) the hoisting blade 21 in a vertical plane. That is, the connecting rod 25 is connected to the operating shaft 26 a that is the output of the electric operating device 26, the 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. The output of. As a result, the undulating blade 21 rotates forward and backward with the lower end as the rotation center. The expansion / contraction operation of the expansion / contraction blade 22 is also performed by the power of the drive motor 27 provided separately. The operation of the blades (the undulating blade 21 and the telescopic blade 22) will be described later.

  2 to 4 show an embodiment of the electric operating device 26. In the electric operating device 26, the front surface of the rectangular mechanism box 30 is opened, and the front door 31 is attached to the front surface. In the present embodiment, since only one surface is open as described above, it is only necessary to secure a work space for maintenance management on the front surface side. At a predetermined position on the top surface of the mechanism box 30, the operation shaft 26a is disposed so as to protrude outward.

  Since only the front surface of the mechanism box 30 is opened, 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 configured by collecting main relays into a single panel. Therefore, parts replacement becomes easy. Further, the drive motor unit 40 which is a main part of the present invention is fixed to a frame 41 connected to the inner wall surface of the mechanism box 30 and is disposed at a predetermined position in the mechanism box 30.

  As shown in FIG. 5, the drive motor unit 40 employs a configuration in which the motor unit 43 and the speed reducer unit 44 are integrated and housed in one case. As the motor unit 43, a special squirrel-cage induction motor (torque motor) having a rated operating voltage of 400 V AC was used. And the torque characteristic with respect to the rotation speed of this torque motor was as shown by the solid line in FIG. That is, the torque characteristic gradually decreases while taking a substantially constant value in the low-speed rotation region, and the torque value greatly decreases and reaches zero when it exceeds a certain rotation speed.

  As described above, the torque motor according to the present embodiment has a good stall characteristic and outputs the maximum torque in the low speed rotation region. Therefore, even if the rotation speed of the motor decreases, the desired torque continues to be output without any problem and the undulation blade 31. Since it can be given to the side, the motor stall can be suppressed.

  Further, unlike the conventional ordinary squirrel-cage induction motor, the maximum torque (maximum output) is set in the low-speed rotation region, and the maximum torque is set to be within the torque region cut by the conventional clutch mechanism. Accordingly, since it is not necessary to provide a clutch mechanism, the drive motor unit 40 of the present embodiment is configured by a motor unit 43 and a reduction gear unit 44 (without a clutch mechanism). As described above, the clutch mechanism which is the part with the most trouble occurrences among the parts constituting the electric operating device is eliminated, so that the product quality maintenance is improved, and the reduction gear unit 44 has a predetermined number of gears. Since these are combinations, it is difficult to break down and the frequency of maintenance and repair after installation is low. Therefore, the gears constituting the torque motor and the speed reducer are housed in one case as shown in FIG. The shaft is used as it is as the operation shaft 26 a of the electric operation device 26. Therefore, it becomes a uniaxial mechanism and the mechanism part becomes simple. Furthermore, since the gears constituting the reduction gear unit 44 are accommodated inside the case, drying of grease injected into the gear tube and adhesion of dust can be suppressed, and maintenance and maintenance are not required for a long period of time.

  The grounding device 20 for the disconnecting device controls the operation of the electric operating device 26 and the telescopic motor 27, and the state in which the telescopic blade 22 shown by a two-dot chain line in FIG. The stretchable blade 22 indicated by the solid line extends and switches between the state where the undulating blade 21 stands. Specifically, when a normal disconnector is first turned on, as shown in FIG. 7A, the undulating telescopic blade 22 is contracted and the blade 21 is in a sagging state. At this time, since the fixed contact portion 23 and the telescopic blade 22 are not in contact with each other, the grounding device 20 is completely open.

  When a closing operation (command from a remote control panel) is received from this state, the control unit in the electric operating device 26 starts the rotational operation of the torque motor of the drive motor unit 40 in a predetermined direction. The rotation output of the torque motor is transmitted to the speed reducer, and when the output of the torque motor rotates, the operation shaft 26a rotates by a predetermined angle. Then, the rotational force of the operating shaft 26a is transmitted to the undulating blade 21 via the connecting rod 25 and the link mechanism 24, and the undulating blade 21 rotates around the lower side and stands up (FIG. 7B). The control unit stops the torque motor with the undulating blade 21 standing. That is, the operation shaft 26a rotates by a predetermined angle (for example, 196 degrees) and stops. In this embodiment, the torque motor operates for 8 seconds and stops rotating. Therefore, the operating shaft 26a of the electric operating device 26 rotates 196 degrees over 8 seconds, and the undulation blade 21 rotates 90 degrees over 8 seconds.

  Next, the telescopic motor 27 is operated, and the tip of the telescopic blade 22 is moved upward. When the expansion / contraction motor 27 operates for a predetermined time, the expansion / contraction blade 22 extends by a length corresponding to the expansion / contraction motor 27 and the tip contacts the fixed contact portion 23 (FIG. 7 (c) → FIG. 7 (d)). As a result, the grounding device 20 is completely turned on.

  On the other hand, when transitioning from the fully charged state shown in FIG. 7 (d) to the fully opened state shown in FIG. 7 (a), the procedure is reversed. That is, first, the telescopic motor 27 is rotated in the reverse direction. As a result, the telescopic blade 22 contracts and transitions from the state of FIG. 7D to the state of FIG. Next, the torque motor of the drive motor unit 40 of the electric operation device 26 is rotated in the reverse direction. As a result, the hoisting blade 21 rotates 90 degrees from the standing state and falls down, so that the state shown in FIG. 7B transitions to the state shown in FIG.

[Other uses]
In the above-described embodiment, an example of application to the electric operation device 26 of the grounding device laid in the disconnector of the 550 kV substation has been shown, but the present invention is not limited to this, You may use for a drive source. Further, the present invention is not limited to a 550 kV substation and can be applied to any place where an AC power source is present.

DESCRIPTION OF SYMBOLS 10 Disconnector 20 Grounding device 21 Hoisting blade 22 Telescopic blade 23 Fixed contact part 26 Electric operation apparatus 26a Operation shaft 40 Drive motor unit 43 Motor part 44 Reduction gear part

Claims (3)

An electric operating device used for a disconnector or a grounding device for a disconnector,
A torque motor that is an AC motor and a speed reducer linked to the output of the torque motor;
The torque characteristic with respect to the rotational speed of the torque motor is such that the maximum torque is output in a low-speed rotation region, and the maximum torque is set to a magnitude that does not damage the disconnector or the disconnector grounding device. An electric operating device.   The electric operating device according to claim 1, wherein the torque motor and the speed reducer are housed in the same case.   The torque characteristics are such that the output torque is constant or gradually decreases with an increase in the rotational speed in the low-speed rotation region, and the rate of change in which the output torque decreases with the increase in the rotational speed in the high-speed rotation region is the low-speed rotation. The electric operating device according to claim 1, wherein the setting is larger than the rate of change in the region.

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