JP3384699B2 - Abnormal diagnosis device for electrical equipment operation mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a torque of an electric device operating mechanism and diagnosing an abnormality, and more particularly to a device for diagnosing an abnormality of a tap changer under load by measuring a driving torque during tap change. Is.

[0002]

2. Description of the Related Art For example, a load tap switching device provided in a load tap switching transformer connected to a power transmission and distribution system is a load tap switching device connected to each tap of a winding of a transformer. It is composed of an operating mechanism for driving. Further, the load tap changer is composed of a switching switch for switching the load current, a tap selector for selectively connecting with the tap, and a converter for switching polarity or transition, and by appropriately operating these, power transmission and distribution can be performed. The system voltage is kept constant. The tap switching device during load switches the taps of the transformer windings while the load current flows, and therefore the transformer tap windings are temporarily short-circuited between the switching target taps through a resistor or a reactor. Therefore,
If an abnormality occurs in the tap switching mechanism and normal switching operation does not occur, a short-circuit current may flow in the transformer tap winding. Therefore, it is an important subject to detect the signs of abnormality of these switching operations at an early stage.

FIG. 13 is a block diagram of a conventional abnormality diagnosing device for a load tap changer disclosed in, for example, Japanese Examined Patent Publication No. 7-75211, in which a torque sensor shows a torque waveform during operation of the load tap changer. Measurement is performed and this waveform is analyzed to diagnose whether there is any abnormality. In the figure, an operation signal is sent from the operation signal transmitter 41 to the electric operation mechanism 42, and the load tap changer 43 is driven by the electric operation mechanism 42. The torque generated on the drive shaft of the electric operating mechanism 42 is detected by the torque sensor unit 44, and the torque detected by the torque sensor unit 44 is integrated by the integrating unit 45 for each switching operation.

The storage section 46 stores the operation signal from the operation signal transmission section 41, the torque pattern relating to a series of switching operations detected by the torque sensor section 44, and the integrated value from the integration section 45, and the switching pattern determination section. Reference numeral 47 determines which switching pattern the switching operation corresponds to from the operation signal according to the procedure described later. The normal torque pattern storage unit 48 stores a torque pattern at the time of normal operation for each of a total of six types of switching patterns, which will be described later, as a normal torque pattern, and the abnormal point determination unit 49 stores the detected torque pattern from the storage unit 46 and the normal torque pattern storage. The presence or absence of an abnormality in the switching operation or the abnormal portion is detected by comparing with the normal torque pattern from the portion 48, and the abnormality display portion 50 displays the output of the abnormal portion determination portion 49. The normal torque pattern correction unit 51 corrects the stored value in the normal torque pattern storage unit 48 from the variation tendency of the integrated value from the storage unit 46 when the abnormal portion determination unit 49 does not detect the abnormality or the sign thereof.

FIGS. 14 to 16 show examples of actual measurement of torque patterns detected by the torque sensor unit 44. First, FIG. 14 shows a switching switch, a tap selector and a converter in a series of switching operations. In the case of the switching pattern in which everything operates, as shown in the figure, the stored torque for driving the switching switch begins to be applied from time t1 and shows a relatively gradual increasing tendency. It operates (time t6). Then, during this period, the tap selector driving torque between the opening time t2 and the closing time t5 of the tap selector and the converter driving torque between the opening time t3 and the closing time t4 of the converter are applied. .

FIG. 15 shows a case of a switching pattern in which the switching switch and the tap selector operate. As shown in FIG. 15, the driving torque of the switching switch is the same as in FIG. Torque for driving the tap selector is applied between time t2 and time t5 until the operation of the switch. 16 shows a switching pattern in which only the switching switch operates.

There are three types of switching patterns as described above.
There are a total of six types, with the types of switching directions of up and down added to the types switching modes. Here, the intention of distinguishing the type of the switching direction as the switching pattern, that is, whether the switching direction is up or down is as follows. That is, in the thrust bearing of the worm gear mechanism, which is generally used in the middle of the drive shaft of the operating mechanism, particularly the thrust bearing of the input worm, the friction coefficient of the pressure receiving portion greatly differs depending on the rotating direction of the shaft. As a result, the detected value from the torque sensor unit 44 varies depending on whether the switching direction is up or down. Therefore, by taking into consideration the distinction between the two directions as the switching pattern, it is possible to make a reliable abnormality determination.

By the way, in the load tap changer,
The converter operates only when switching from a particular tap position to the up or down direction. Therefore,
The switching pattern determination unit 47 determines whether the switching operation corresponds to the pattern shown in FIG. 14 based on the tap position number of the operation signal and the information on the switching direction. Further, in the load tap changer, when the change is made in the opposite direction to the change direction before the change, neither the tap selector nor the changer operates, and only the changeover switch operates. Therefore, the switching pattern determination unit 47
The switching operation is shown in FIG. 16 from the transition of the switching direction of the operation signal.
It is determined whether or not it corresponds to the pattern shown in.

The switching pattern discriminating unit 47 discriminates the switching pattern based on the operation signal from the storage unit 46 in the above-described manner and sends the information to the normal torque pattern storage unit 48. The abnormal point determination unit 49 compares the torque pattern from the storage unit 46 at the time of the switching operation with the normal torque pattern in the normal torque pattern storage unit 48 selected by the switching pattern determination unit 47. For example, in the case of the switching pattern shown in FIG. 14, the magnitude of each torque peak is compared with their time intervals. When the ratio (difference) between the two exceeds a predetermined set value, it is determined that there is an abnormality or that there is a sign of abnormality, and the location of the abnormality is specified from the occurrence time zone as described below.

[0010]

[Table 1]

Here, as a concrete criterion for judging that there is a sign of abnormality, it is appropriate to set, for example, the magnitude of the torque to more than twice the normal value. this is,
8 according to the load tap changer standard (JEC-2220)
This is because the mechanical life of 0,000 times is required, and the fact that the sliding part is worn and the torque gradually increases year by year is taken into consideration.

Further, as a concrete criterion for judging that there is an abnormality, for example, the magnitude of the torque is 5 times or more than that in the normal state, or the torque peak intervals t1-t2, t2-t3 ... It is set to about 5 times or more. This is because if there is such a change, welding of the movable contact of the load tap changer or seizure of the sliding member may occur.

The normal torque pattern correction unit 51 is for increasing the sensitivity of abnormality detection. That is, in general,
It is often experienced that the moving torque of the machine decreases due to its familiar effect compared to the initial state. Therefore, in extreme cases, the drive torque is often less than half the initial value. Therefore, if the presence / absence of an abnormality is always determined based on a fixed reference, the detection of the abnormality will be delayed or missed.

Therefore, the normal torque pattern correction unit 51
For example, the integrated value of the torque during that time is tracked 1000 times, the fluctuation tendency is tested by the least-squares method, etc., and if it is recognized that there is a decreasing tendency, the decreasing rate is calculated, and it is used as the normal torque pattern. By multiplying, the stored value in the normal torque pattern storage unit 48 is corrected. Then, the abnormal point determination unit 49 performs the abnormality determination based on the corrected new normal torque pattern. As a result, the torque fluctuation due to the familiar effect described above is offset, and the abnormality detection sensitivity is improved accordingly.

The abnormality diagnosis of the load tap changer is performed as described above. What kind of mounting method is used for the torque sensor section 44, and which part of the load tap changer the drive shaft is attached to? No specific proposal has been made as to how to install it. However, the conventional method can be known from actual application examples, but most of them are shown in FIG.
Since a method as shown in FIG. 17 is adopted, a conventional specific method will be described with reference to FIG.

In FIG. 17, a transformer tank 52 accommodates a load tap changer 53, and an operating mechanism 54 for switching the load tap changer 53 around the transformer tank 52 and an operation. A connection drive shaft group 55 is provided that connects the mechanism 54 and the tap switch 53 during load and transmits the driving force from the operating mechanism 54 to the tap switch 53 during load. The operation mechanism 54 has a built-in drive motor 56, and the operation mechanism 54 further includes a handle shaft 57 for manual operation, a rotation of the drive motor 56, and a handle shaft 57 for manual operation for turning the load tap changer. A deceleration mechanism 58 that decelerates to a rotation speed suitable for driving 53 and an output drive shaft 59 are provided.

The connecting drive shaft group 55 is composed of a vertical connecting drive shaft 60 and a horizontal connecting drive shaft 61, and driving force transmission from the vertical connecting drive shaft 60 to the horizontal connecting drive shaft 61 is provided at a connection point between them. This is done via the direction change gear 62. The vertical connection drive shaft 60 is composed of a lower vertical connection drive shaft 63 and an upper vertical connection drive shaft 64, and the lower end of the lower vertical connection drive shaft 63 is connected to the output drive shaft 59 of the operating mechanism 54. A fixed torque sensor 65 is inserted between the lower vertical connecting drive shaft 63 and the upper vertical connecting drive shaft 64, and one end of the torque detecting shaft 66 is provided at the upper end of the lower vertical connecting drive shaft 63 and the other. The end is connected to the lower end of the upper vertical connecting drive shaft 64, and the casing 67 of the fixed torque sensor 65 is fixedly supported on the side wall of the transformer tank 52.

The output waveform from the fixed type torque sensor 65 is recorded, analyzed and diagnosed by the data processing device 68, and a method which has already been widely practiced (see FIGS.
Similarly to the method described with reference to FIG. 16, the output waveform is recorded and compared with a reference waveform stored in advance and analyzed to determine whether or not there is an abnormality (normal within a preset limit, limit If it exceeds, it is diagnosed as abnormal and the result is output.

Next, the operation of FIG. 17 will be described. When the drive motor 56 starts to rotate or the handle shaft 57 for manual operation starts to rotate by a manual handle operation in response to an electric motor operation command from a command unit (not shown), these rotations are tap-switched under load by the speed reduction mechanism 58. The output drive shaft 59 is decelerated to a rotation speed suitable for the device 53.
Is output to. The rotation of the output drive shaft 59 passes through the lower vertical connection drive shaft 63, the torque detection shaft 66 of the torque sensor 65, the upper vertical connection drive shaft 64, the direction changing gear mechanism 62, and the horizontal connection drive shaft 61, which are connected thereto. It is transmitted to the load tap changer 53, whereby the load tap changer 53 is switched.

Since the torque detection shaft 66 of the fixed torque sensor 65 is inserted in series in the rotational force transmission path as described above, it directly receives the drive torque when the load tap changer 53 is switched. The torque detection shaft 66 detects the drive torque at the time of this switching operation and outputs the waveform. The output waveform is recorded, analyzed, and diagnosed by the data processing device 68, and as a result, the presence or absence of abnormality is output.

[0021]

A conventional abnormality diagnosing device for an electric equipment operating mechanism, particularly an abnormality diagnosing device for a load tap changer, is constructed as described above, and a torque sensor is inserted in the middle of a connecting shaft. Therefore, the continuous drive shaft, which should originally be a continuous integral shaft, is divided, the number of connecting points increases, and the mechanical reliability of the connecting shaft decreases.

Further, when retrofitting to an existing load tap changer, modification such as cutting or separating the connecting drive shaft or installing a base for mounting the housing of the torque sensor is required, which is easy. Not applicable to.

Further, since it is a fixed installation type, the installed torque sensor is dedicated to the target load tap changer, so that a dedicated torque sensor is required for each load tap changer, which is uneconomical. is there.

The present invention has been made to solve the above-mentioned problems, and can be applied to a continuous drive shaft, which should originally be a continuous integral shaft, without being divided, and can also be applied to an existing load tap changer. It is also an object of the present invention to provide an abnormality diagnosis device for an electric device operating mechanism, which can be easily applied without modification, and which can perform abnormality diagnosis of many tap switching under load with one torque sensor.

[0025]

According to a first aspect of the present invention, there is provided a drive device with a built-in torque sensor, which detects a torque generated in a drive shaft of an electric device operating mechanism to determine abnormality diagnosis.
The configuration first comprises a first frame and a second frame arranged coaxially. The first frame and the second frame may have a quadrangular shape shown in FIG. 2 or a circular frame, and are preferably similar to each other. Further, as long as they are coaxial, the positional relationship between the inner frame and the outer frame on the same plane will be the same as in JP-A-6-32.
It may be on a parallel plane as shown in FIG. Further, a pillar that is connected to each other is provided between the first frame and the second frame, and the pillar is provided with a strain detection element such as a strain gauge. Further, a rotation socket such as an electric motor with a speed reduction mechanism is mounted on the first frame, and an output shaft of the rotation driving means can be connected to a drive shaft (a handle shaft for manual operation) of an operation mechanism of an electric device. And the like.

When diagnosing the operating mechanism (load tap switching device) of the electric equipment, the output shaft of the rotary drive means is attached to the handle shaft for manual operation and the drive shaft is rotated by the rotary drive means. At the same time, the torque from the drive shaft is detected by the strain detecting element.

The invention of claim 2 is provided with a data processing device for recording, analyzing and diagnosing the torque waveform output by the strain detecting element, and analyzing the output waveform output from the strain detecting element by the data processing device to perform abnormality diagnosis. It is something that is done.

The invention according to claim 3 is characterized in that a protective casing for covering the entire rotation driving means is attached to the second frame.

The invention of claim 4 is characterized in that a holder is attached to the second frame or the protective casing.

The invention of claim 5 is characterized in that a pair of grips is used as a holder.

The invention of claim 6 is characterized in that the switch for instructing the start and stop of the rotation driving means is attached within a range within which the fingers of the hand holding the pair of grips can reach.

The invention according to claim 7 is characterized in that a universal joint is provided between the output shaft of the rotation driving means and the connecting means.

According to the invention of claim 8, the rotation driving means is supported by a monopod or a tripod.

The invention of claim 9 is characterized in that the rotation driving means is held by a supporting arm which can be attached to a housing or the like of an operating mechanism of an electric device.

The invention of claim 10 is characterized in that the switch for instructing the start and stop of the rotation driving means is of the foot type.

An eleventh aspect of the invention is characterized in that a servomotor with a reduction mechanism is used as the rotation driving means.

[0037]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an overall configuration in which the present invention is applied to a load tap changer abnormality diagnosis device. A load tank tap changer 2 is housed in a transformer tank 1.
The tap changer 2 under load is switched by the operating mechanism 3. The operating mechanism 3 and the load tap changer 2 are connected by a connecting drive shaft group 4, and the connecting drive shaft group 4 has a role of transmitting the driving force of the operating mechanism 3 to the load tap changer 2. Is playing. The operation mechanism 3 has a built-in electric motor 5 for electric operation.
Is a handle shaft 6 for manual operation, an electric motor 5 for electric operation
Further, it is composed of a reduction mechanism 7 for reducing the rotation of the handle shaft 6 for manual operation to a rotation speed suitable for driving the tap changer 2 under load, and an output drive shaft 8 of the reduction mechanism 7.

The connecting drive shaft group 4 is composed of a vertical connecting drive shaft 9 and a horizontal connecting drive shaft 10, and the transmission of the driving force from the vertical connecting drive shaft 9 to the horizontal connecting drive shaft 10 is provided at the connection point between them. This is done via the direction change gearbox 11. The lower end of the vertically connected drive shaft 9 is connected to the output drive shaft 8 provided in the operation mechanism 3. The output shaft of the torque sensor built-in drive device 12 can be connected to the handle shaft 6 for manual operation.
The output waveform detected by is recorded, analyzed and diagnosed by the data processing device 13.

2, FIG. 3, FIG. 4, and FIG. 5 are a front view, a side view, a plan view, and a perspective view, respectively, showing the configuration of the torque sensor built-in drive device 12, and FIG. A
FIG. 7 is a sectional view taken along the line BB of FIG. The torque sensor built-in drive device 12 includes a rectangular inner frame 14,
The inner frame 14 is composed of a rectangular outer frame 15 coaxially arranged, a pillar 16 for connecting the inner frame 14 and the outer frame 15 to each other, and a strain gauge 17 attached to the pillar 16. An output signal line 18 is drawn from the strain gauge 17.

The inner frame 14 has a motor 19 with a reduction mechanism.
The output shaft 20 coaxial with the inner frame 14 and the outer frame 15 is installed in the motor 19 with reduction mechanism, and the power cord 21 for operating the motor is further provided in the motor 19 with reduction mechanism. It is connected. A joint socket 22 is attached to the tip of the output shaft 20 of the electric motor 19 with a reduction mechanism, and the joint socket 22 is formed so that it can be inserted into the handle shaft 6 for manual operation of the operating mechanism 3. Further, a pair of grips 23 serving as a holder is attached to the outer frame 15, and a power switch 24 for turning on / off the power is further attached to the pair of grips 23, and the power switch 24 is a power cord. It is inserted and connected in the middle of 21. The power switch 24
Is attached within a range within which the fingers of the hand holding the pair of grips 23 can reach, and is configured to facilitate the operation.

Next, the operation of the first embodiment will be described. When diagnosing abnormality of the tap changer 2 under load,
First, the power cord 21 of the drive unit 12 with a built-in torque sensor
Is connected to the power source, and the output signal line 18 is connected to the data processing device 13. Next, as shown in FIG. 5, the pair of grips 23 are held by both hands to hold the torque sensor built-in drive device 12, and the joint socket 22 attached to the tip of the output shaft 20 of the motor 19 with a speed reduction mechanism is operated. 3 is inserted in the handle shaft 6 for manual operation attached to the shaft 3. And
When the power switch 24 of the torque sensor built-in drive device 12 is pressed with a finger to turn on the power, the motor 19 with a reduction mechanism starts to rotate, and accordingly, the output shaft 20 thereof rotates to start driving the handle shaft 6 for manual operation. . When the handle shaft 6 for manual operation starts to rotate, the rotation is reduced to a rotation speed suitable for driving the tap changer 2 under load by the reduction mechanism 7 and output to the output drive shaft 8. The rotation of the output drive shaft 8 is transmitted to the load tap changer 2 via the vertical connection drive shaft 9, the direction change gear 11, and the horizontal connection drive shaft 10, which are connected to the output drive shaft 8, respectively. Is switched.

When the handle shaft 6 for manual operation is driven by the electric motor 19 with a deceleration mechanism of the drive unit 12 with a built-in torque sensor to perform the tap switching operation, a counter torque equal to the driving torque is output through the handle shaft 6 to the output shaft. 20, the electric motor 19 with a speed reduction mechanism is transmitted, and the electric power is sequentially transmitted from the inner frame 14 to which the electric motor 19 with a speed reduction mechanism is attached to the outer frame 15 via the pillar 16. Then, the anti-torque is finally supported by the hand of the operator holding the pair of grips 23. The strain gauge 17 attached to the support column 16 detects the strain of the support column 16 according to the counter torque equal to the drive torque and outputs the waveform. Output waveform is output signal line 18
Is transmitted to the data processing unit 13 by means of, for example, FIG.
Recording, analysis, and diagnosis are performed by the methods shown in FIGS. 1 to 14, and the results are output.

As described above, according to the first embodiment, instead of inserting the fixed torque sensor in the middle of the drive shaft,
The torque sensor built-in drive device is attached to the handle shaft 6 for manual operation when the diagnosis is required, and the drive waveform is measured to measure the torque waveform. It can be applied to the switch without any special modification. Also, since it is mounted when necessary, it is possible to carry out diagnosis with any number of load tap changers by one abnormality diagnosis device if carried around in pairs with the analysis device.

The torque sensor built in the torque sensor built-in drive device 12 is of anti-torque detection type, and since the strain gauge 17 is attached to the pillar 16 of the torque sensor frame which is the stationary portion, its output signal is , Strain gauge 17
Since the signal can be directly extracted without passing through the slip ring as in the case where is mounted on the rotating shaft, a stable output signal waveform without noise can be obtained.

Embodiment 2. In the first embodiment, the pair of grips 23 to which the power switch 24 as the holder is attached are directly attached to the outer frame 15. However, as shown in FIG. A protective housing 25 is attached to cover the protective housing 25, and a pair of grips 26 are attached to the protective housing 25.
The power switch 27 may be attached.

With the above construction, the protective housing 25 can protect the electric motor 19 with a reduction mechanism, and the position of the center of gravity of the drive unit 12 with a built-in torque sensor can be searched for and the pair of grips 26 can be attached to the optimum positions. Therefore, even if the operator holds it, it is easy to hold.

Embodiment 3. In the device according to the second embodiment described above, the case is shown in which the protective housing 25 that covers the entire electric motor 19 with a reduction mechanism is provided, and the pair of handles 26 and the power switch 27 as a holder are attached to the protective housing 25. Even when the protective housing 25 is provided, the pair of grips 23 provided with the power switch 24 can be attached to the outer frame 15 configuring the torque sensor built-in drive device 12 as in the case of the first embodiment. .

In this case, the protective housing 25 can protect the electric motor 19 with a reduction mechanism as in the case of the second embodiment, and further, in the present embodiment, the protective housing 25 has the same structure as in the case of the second embodiment. Since the anti-torque due to the drive does not act, it is not necessary to consider the strength of the protective housing 25, and the cost for manufacturing the device can be reduced.

Fourth Embodiment Embodiments 1, 2 and 3
In the abnormality diagnosis device of the tap changer under load by
Only the joint socket 22 was connected to the tip of the output shaft 20 of the torque sensor built-in drive device 12, but in this case, the handle shaft 6 for manual operation and the torque sensor built-in drive device 1 are used.
If the axes of the two output shafts 20 do not match, there is a drawback that an unstable torque waveform with torque fluctuation noise is generated. Therefore, as shown in FIG. 9, a universal joint 28 may be inserted between the output shaft 20 and the joint socket 22 in series with them.

With the above-described structure, even if the shafts of the manual handle shaft 6 and the driving device 12 with a built-in torque sensor held by the operator do not match, the universal joint 28 does not match the shaft centers. Since it is absorbed, there is an effect that a stable torque waveform free of torque fluctuation noise due to the disagreement of the shaft centers can be obtained. The universal joint 28 is a commercially available one.

Embodiment 5. In the devices according to the first to fourth embodiments, the torque sensor built-in drive device 12 is used.
Although a pair of grips 23 and 26 is provided as a holding tool so that the operator can hold it by hand, as shown in FIGS. 10 and 11, in addition to the pair of grips 23 and 26, A monopod 29 or a tripod 30 may be added. In this case, the weight of the drive unit 12 with a built-in torque sensor can be supported by the monopod 29 or the tripod 30, so that the operator only has to put his or her hand on the handles 23 and 26 only to prevent the operator from falling. Therefore, the burden on the operator is reduced. In addition, since the holding height of the torque sensor built-in drive device 12 is stabilized by the monopod 29 or the tripod 30, there is an effect that stable measurement is possible.

Sixth Embodiment In the devices according to the first to fifth embodiments, the drive device 1 with a built-in torque sensor is used.
Although a pair of grips 23 and 26 is provided as a holder so that the operator can hold the hand 2 by hand,
Instead of the pair of handles 23 and 26, as shown in FIG. 12, the drive device 12 with a built-in torque sensor may be held by a support arm 31 that is seated on the housing of the operation mechanism 3. In FIG. 12, four support arms 3 attached to the outer frame 15
1 holds the drive device 12 with built-in torque sensor,
The joint socket 22 is inserted into the handle shaft 6 for manual operation of the operation mechanism 3.

With the above configuration, the operator does not need to hold the torque sensor built-in drive device 12, the burden on the operator is reduced, and the holding is stable, so that stable measurement is possible. There is an effect that.

Embodiment 7. In the devices according to the first to sixth embodiments, the torque sensor built-in drive device 12 is used.
The operator turns on the power switch 24 or 27 of the drive device 1
Although the pair of grips 23 or the protective housing 25 is attached so that the user can operate the hand 2 while holding it, a foot-operated switch may be inserted in the middle of the power cord 21 instead.

In this case, since the power switch can be turned on and off by the foot, the operator's hand can concentrate on holding the torque sensor drive device 12.
There is an effect that stable holding becomes possible and therefore stable measurement becomes possible.

Embodiment 8. In the devices according to the first to seventh embodiments, the torque sensor built-in drive device 1 is used.
Although it has not been specified what type of motor 2 with reduction gear mechanism of 2 is used, if a servomotor with reduction gear mechanism is used as the motor with reduction gear mechanism, the constant rotation speed is maintained regardless of changes in load torque. Measurement becomes possible. As a result, there is an effect that a stable and highly accurate output waveform can be obtained from the point of view of the passage of time, and it becomes possible to accurately analyze how much torque is generated at which rotation angle position.

Other Embodiments. In each of the devices according to the first to eighth embodiments, the abnormality diagnosing device for the load tap changer has been described as an example. However, as long as the device has the handle shaft 6 for manual operation as in the above-described embodiments. It is needless to say that the abnormality diagnosis device for the operation mechanism of other electric devices such as the disconnector and the circuit breaker can be used with the same configuration as that shown in the above embodiment.

[0058]

According to the inventions of claim 1 and claim 2,
It is not necessary to divide the connection drive shaft of the electric device operating mechanism, for example, the connection drive shaft of the load tap changer, or increase the number of connection points. Therefore, the abnormality diagnosis can be performed without impairing the reliability of the electric device operating mechanism such as the load tap changer. Further, the present invention can be applied to an existing electric device operating mechanism (load tap changer) without any modification. Furthermore, the drive shaft of the electric device operating mechanism,
For example, since it can be connected to the handle shaft by inserting it, it is possible to carry out a malfunction diagnosis of many tap changers under load by one malfunction diagnosis device, which is extremely economical. As described above, when it is desired to make a periodical abnormality diagnosis by utilizing opportunities such as periodical inspection, the method of carrying around has a very high practical effect. Further, since the strain detecting element is attached to the support of the torque detecting frame which is the stationary portion, the output signal is directly output without passing through the slip ring as in the case where the strain detecting element is attached to the rotating shaft. A stable output signal waveform without noise can be obtained.

According to the third and fourth aspects of the present invention, since the protective housing covering the entire rotary driving means is attached, the protective housing can protect the rotary driving means such as the electric motor with the reduction mechanism and the built-in torque sensor. Since it is possible to find the position of the center of gravity of the entire drive device and attach the holder (a pair of handles) to the optimum position, the operator can easily hold the holder.

A protective housing for covering the entire rotation driving means, and a second
By providing the holder attached to the frame, the rotation drive means can be protected by the protective housing, and the protective housing does not receive anti-torque due to driving, so it is not necessary to consider the strength of the protective housing. This has the effect of reducing the cost involved.

According to the fifth aspect of the present invention, since the pair of grips is used as the holder, the torque sensor built-in drive device can be held by gripping the pair of grips.

According to the invention of claim 6, since the power switch is mounted within a range within which the fingers of the hand holding the pair of grips can reach, there is an effect that the operation becomes easy.

According to the invention of claim 7, since the universal joint is provided between the output shaft of the rotary drive means and the joint socket, the handle shaft for manual operation and the shaft of the torque sensor built-in drive device held by the operator. Even if there is a discrepancy in the hearts, this universal joint absorbs the discordance of the shaft centers, and there is an effect that a stable torque waveform free of torque fluctuation noise due to the discordances of the shaft centers can be obtained.

According to the eighth aspect of the present invention, since the drive unit with built-in torque sensor is supported by the monopod or tripod, the weight of the drive unit with built-in torque sensor can be supported by the monopod or tripod, and the operator can only prevent the tilt. Therefore, it is only necessary to put a hand on the handle, and the burden on the operator is reduced. Also, since the holding height of the torque sensor built-in drive device is stabilized by the monopod or tripod, there is an effect that stable measurement can be performed.

According to the ninth aspect of the present invention, since the rotation driving means is held by the supporting arm which can be attached to the housing of the operating mechanism of the electric device, the operator is required to hold the torque sensor built-in driving device. Is eliminated, and the burden on the operator is reduced, and as a result of stable holding, stable measurement is possible.

According to the tenth aspect of the invention, since the switch for instructing the start / stop of the rotation driving means is of the foot type, the power switch can be turned on / off by the foot, and the operator's hand It is possible to concentrate on holding the drive device with the built-in torque sensor, and it is possible to hold it stably, and thus it is possible to perform stable measurement.

According to the eleventh aspect of the present invention, since the servomotor with a reduction mechanism is used as the rotation driving means, it is possible to measure at the rotation speed regardless of changes in the load torque. As a result, there is an effect that a stable and highly accurate output waveform can be obtained from the point of view of the passage of time, and it becomes possible to accurately analyze how much torque is generated at which rotation angle position.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an entire abnormality diagnosing device for a tap changer under load according to a first embodiment of the present invention.

FIG. 2 is a front view showing the configuration of a drive device with a built-in torque sensor according to Embodiment 1 of the present invention.

FIG. 3 is a side view showing the configuration of a torque sensor built-in drive device according to Embodiment 1 of the present invention.

FIG. 4 is a plan view showing the configuration of a torque sensor built-in drive device according to Embodiment 1 of the present invention.

FIG. 5 is a perspective view showing the configuration of a torque sensor built-in drive device according to Embodiment 1 of the present invention.

FIG. 6 is a perspective view showing the configuration of a torque sensor built-in drive device according to Embodiment 2 of the present invention.

7 is a cross-sectional view taken along the line AA in FIG.

8 is a sectional view taken along line BB in FIG.

FIG. 9 is a configuration diagram showing a joint socket portion of a torque sensor built-in drive device according to Embodiment 4 of the present invention.

FIG. 10 is a plan view showing the configuration of a torque sensor built-in drive device according to Embodiment 5 of the present invention.

FIG. 11 is a plan view showing the configuration of a torque sensor built-in drive device according to Embodiment 5 of the present invention.

FIG. 12 is a perspective view showing a configuration in which a torque sensor built-in drive device according to Embodiment 6 of the present invention is attached to an operation mechanism.

FIG. 13 is a block diagram showing a conventional abnormality diagnosing device for a load tap changer.

FIG. 14 is a characteristic diagram showing a normal torque pattern in a conventional switching pattern.

FIG. 15 is a characteristic diagram showing a normal torque pattern in a conventional switching pattern.

FIG. 16 is a characteristic diagram showing a normal torque pattern in a conventional switching pattern.

FIG. 17 is a configuration diagram showing an entire conventional abnormality diagnosing device for a tap changer during load.

[Explanation of symbols]

2 load tap changer, 3 operating mechanism, 4 connected drive shaft groups, 5 electric motor, 6 handle shaft, 12 torque sensor built-in drive device, 13 data processing device, 14 inner frame,
15 outer frame, 16 pillars, 17 strain gauge, 19 electric motor with reduction mechanism, 20 output shaft, 22 joint socket, 2
3,26 Pair of handles, 24,27 Power switch, 25
Protective housing, 28 universal joints, 29 monopod or tripod,
30 support arms.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Emoto 1 Higashishinmachi, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Inc. (72) Inventor Issei Higuchi, 1 Higashishin-cho, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Ltd. (56) References JP-A-8-69925 (JP, A) JP-A-8-273089 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 29/04 502

Claims (11)

(57) [Claims] 1. An apparatus for determining abnormality diagnosis by detecting torque generated in a drive shaft of an electric device operating mechanism, wherein a first frame and a second frame coaxially arranged, the first frame and the first frame are arranged. A pillar connecting the two frames, a strain detecting element installed on the pillar, a rotation driving unit mounted on the first frame and having an output shaft, and an output shaft of the rotation driving unit for driving the operation mechanism. And a connecting means connectable to the shaft, wherein the rotation driving means rotates the drive shaft and the torque from the drive shaft is detected by the strain detecting element. apparatus. 2. The abnormality diagnosing device for an electric device operating mechanism according to claim 1, further comprising a data processing device for recording, analyzing, and diagnosing a torque waveform output by the strain detecting element. 3. The abnormality diagnosing device for an electric device operating mechanism according to claim 1, further comprising a protective housing attached to the second frame to cover the entire rotation driving means. 4. The abnormality diagnosing device for an electric device operating mechanism according to claim 1, wherein a holder is attached to the second frame or the protective casing. 5. The abnormality diagnosing device for an electric device operating mechanism according to claim 4, wherein a pair of handles are used as the holder. 6. The electric device operating mechanism according to claim 5, wherein a switch for instructing start and stop of the rotation drive means is attached within a range within which a finger of a hand holding a pair of grips can reach. Abnormality diagnosis device. 7. The abnormality of the electric device operating mechanism according to claim 1, wherein a universal joint is provided between the output shaft of the rotation driving means and the connecting means. Diagnostic device. 8. The abnormality diagnosing device for an electric device operating mechanism according to claim 1, wherein the rotation driving means is supported by a monopod or a tripod. 9. The electric device operating mechanism according to claim 1, wherein the rotation driving means is held by a support arm attachable to a housing of the operating mechanism. Abnormality diagnosis device. 10. The foot switch is used as a switch for instructing start and stop of the rotation driving means.
To claim 5, and the abnormality diagnosis device for an electric device operating mechanism according to any one of claims 7 to 9. 11. The abnormality diagnosing device for an electric device operating mechanism according to claim 1, wherein a servomotor with a speed reduction mechanism is used as the rotation driving means.