JPH10144542A - Abnormality diagnostic device for operation mechanism of electrical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable and low cost torque measuring type abnormality diagnostic system for operation system of electrical equipment applicable to an installed on-load tap changer and so on without any additional improvement. SOLUTION: A strain gauge is attached to the strut 16 connecting an internal frame 14 and an external frame 15, and a driving device 12 with a built-in torque sensor having a motor 19 with a deceleration mechanism attached to the internal frame 14 is threaded to a handle shaft 6 for manual operation of an operational mechanism 3, and a torque waveform output from the strain gauge is analyzed by the data processing device 13, so that the abnormality is diagnosed.

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 abnormality, and more particularly to a device for diagnosing abnormality of a tap changer under load by measuring a driving torque at the time of tap change. It is.

[0002]

2. Description of the Related Art For example, a load tap changer provided in a load tap change transformer connected to a power transmission and distribution system includes a load tap changer connected to each tap of a winding of a transformer. And an operating mechanism for driving operation. Further, the on-load tap changer is composed of a switching switch for switching the load current, a tap selector for selecting and connecting to the tap, and a converter for switching the polarity or the transition. The system voltage is kept constant. The on-load tap switching device switches the taps of the transformer winding during the load application in which the load current flows. Therefore, the tap winding of the transformer is 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 a normal switching operation is not performed, a short-circuit current may flow through the transformer tap winding. For this reason, it is an important subject to detect signs of these switching operations abnormally at an early stage.

FIG. 13 is a block diagram of a conventional abnormality diagnosis device for a tap change device under load disclosed in Japanese Patent Publication No. 7-75211. The torque waveform during operation of the tap change device during load is measured by a torque sensor. The waveform is measured and analyzed to determine whether there is any abnormality. In the figure, an operation signal is transmitted from an operation signal transmission unit 41 to an electric operation mechanism 42, and the on-load tap changer 43 is driven by the electric operation mechanism 42. The torque generated on the drive shaft of the electric operation mechanism 42 is detected by the torque sensor unit 44, and the torque detected by the torque sensor unit 44 is integrated by the integration unit 45 for each switching operation.

A storage unit 46 stores an operation signal from an operation signal transmission unit 41, a torque pattern relating to a series of switching operations detected by a torque sensor unit 44, and an integrated value from an integration unit 45, respectively. 47 determines which switching pattern the switching operation corresponds to from the operation signal in a manner described later. The normal torque pattern storage unit 48 stores a torque pattern during normal operation for each of a total of six types of switching patterns described later as a normal torque pattern, and the abnormal part determination unit 49 stores the detected torque pattern from the storage unit 46 and the normal torque pattern. The presence or absence of abnormalities in the switching operation is detected by comparing with the normal torque pattern from the unit 48, and the abnormality display unit 50 displays the output of the abnormal unit determination unit 49. The normal torque pattern correction unit 51 corrects the stored value in the normal torque pattern storage unit 48 from the tendency of the integration value from the storage unit 46 when the abnormal part determination unit 49 does not detect an abnormality or its sign.

FIGS. 14 to 16 show an actual measurement example of a torque pattern detected by the torque sensor unit 44. First, FIG. 14 shows a series of switching operations in which a switching switch, a tap selector and a converter are used. In the case of the switching pattern in which all the switches operate, as shown in the drawing, the accumulated torque for driving the switching switch starts to be applied from time t1 and shows a relatively gradual increase tendency. It operates (time t6). During this time, the tap selector drive torque between the tap selector opening time t2 and the closing time t5 and the converter drive torque between the converter opening time t3 and the closing time t4 are added. .

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

[0007] As the types of the switching patterns, there are three types described above.
The type of switching direction, ascending or descending, is added to the type of switching mode, and there are a total of six types. Here, the intention of distinguishing the type of switching direction between ascending and descending as the switching pattern is as follows. That is, in the worm gear mechanism generally used in the middle of the drive shaft of the operating mechanism, particularly in the input worm thrust bearing, the friction coefficient of the pressure receiving portion greatly differs depending on the rotation direction of the shaft. As a result, a difference occurs in the detection value from the torque sensor unit 44 depending on whether the switching direction is ascending or descending. Therefore, by taking into account the distinction between the two directions as the switching pattern, a reliable abnormality determination can be made.

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

The switching pattern determining section 47 determines the switching pattern based on the operation signal from the storage section 46 in the manner described above, and sends the information to the normal torque pattern storage section 48. The abnormal part determination unit 49 compares the torque pattern at the time of the switching operation from the storage unit 46 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. If 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 an abnormality occurrence location is specified from the time zone of occurrence as described below.

[0010]

[Table 1]

Here, as a specific criterion for judging that there is a sign of abnormality, it is appropriate to set, for example, to an extent that the magnitude of the torque exceeds twice the normal state. this is,
It is 8 in the standard of the tap changer under load (JEC-2220).
A mechanical life of 100,000 times is required, and the sliding portion wears out and the torque gradually increases year by year.

As a specific criterion for judging that there is an abnormality, for example, the magnitude of the torque is five times or more that of 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 such a change occurs, welding of the movable contact of the tap changer under load, seizure of the sliding member, or the like is assumed.

The normal torque pattern correction section 51 is for increasing the sensitivity of abnormality detection. That is, in general,
It is a common experience that the moving parts of the machine have reduced drive torque compared to the initial state due to their familiar effect. For this reason, in extreme cases, the driving torque is often less than half the initial value. Therefore, if the presence or absence of an abnormality is always determined based on a certain standard, the detection of the abnormality may be delayed or overlooked.

Therefore, the normal torque pattern correction unit 51
For example, tracking the integrated value of the torque during 1000 times, test the fluctuation tendency by the least squares method or the like, and if it is recognized that there is a decreasing tendency, calculate the rate of decrease, and convert it to a normal torque pattern. The stored value in the normal torque pattern storage unit 48 is corrected by multiplication. Then, the abnormal part determination unit 49 makes an abnormality determination based on the corrected new normal torque pattern. As a result, the above-described torque fluctuation due to the familiar effect is offset, and the sensitivity of abnormality detection is improved accordingly.

As described above, the abnormality diagnosis of the on-load tap changer is performed. The type of mounting of the torque sensor unit 44 and the drive shaft of the portion of the on-load tap changer are determined. There is no specific suggestion as to whether or not to mount. However, the conventional methods can be known from actual application examples, but most of them are shown in FIG.
Since the method shown in FIG. 17 is employed, a specific conventional method will be described with reference to FIG.

In FIG. 17, a transformer tap 52 has a load tap changer 53 housed therein. Further, around the transformer tank 52, an operation mechanism 54 for switching the load tap changer 53, and an operation mechanism 54 A coupling drive shaft group 55 that connects the mechanism 54 and the on-load tap changer 53 and transmits the driving force from the operating mechanism 54 to the on-load tap changer 53 is provided. A drive motor 56 is built in the operation mechanism 54, and the operation mechanism 54 controls the rotation of the handle shaft 57 for manual operation, the drive motor 56 and the handle shaft 57 for manual operation by using a load tap changer. A deceleration mechanism 58 for decelerating to a rotation speed suitable for driving the 53 and an output drive shaft 59 are provided.

The connection drive shaft group 55 is composed of a vertical connection drive shaft 60 and a horizontal connection drive shaft 61, and the transmission of the driving force from the vertical connection drive shaft 60 to the horizontal connection drive shaft 61 is provided at a connection point between them. This is performed via the direction changing gear 62. The vertical connection drive shaft 60 includes 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 operation mechanism 54. A fixed torque sensor 65 is inserted between the lower vertical connection drive shaft 63 and the upper vertical connection drive shaft 64, and one end of the torque detection shaft 66 is connected to the upper end of the lower vertical connection drive shaft 63, and the other. An end is connected to a lower end of the upper vertical connection drive shaft 64, and a housing 67 of a fixed type torque sensor 65 is fixedly supported on a 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 (FIGS.
Similarly to the method described with reference to FIG. 16, the output waveform is recorded and analyzed by comparing it with a pre-stored reference waveform to diagnose the presence or absence of an abnormality (normal within the preset limit, Is exceeded, the abnormality is diagnosed), and the result is output.

Next, the operation of FIG. 17 will be described. When the drive motor 56 starts to rotate in response to a motor operation command from a command unit (not shown) or the handle shaft 57 for manual operation starts to rotate by manual handle operation, these rotations are switched by the speed reduction mechanism 58 to switch the load tap. The output drive shaft 59 is reduced to a rotation speed suitable for the
Is output to The rotation of the output drive shaft 59 is passed 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 connected thereto. The load tap changer 53 is transmitted to the load tap changer 53, whereby the load changer 53 is switched.

Since the torque detecting 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 driving torque at the time of the switching operation of the on-load tap changer 53. The torque detecting shaft 66 detects the driving 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 an abnormality is output.

[0021]

A conventional apparatus for diagnosing an abnormality in an operation mechanism of an electric apparatus, particularly an apparatus for diagnosing an abnormality in a tap changer under load is constructed as described above, and a torque sensor is inserted in the middle of a connecting shaft. As a result, the continuous drive shaft, which should be a continuous integral shaft, is cut off, and the number of connection points increases, and the mechanical reliability of the connection shaft decreases.

In addition, when retrofitting to an existing on-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. Not applicable to

Further, since it is of a fixed installation type, the installed torque sensor is exclusively used for the target load tap changer. Therefore, 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 problems, and can be applied without dividing a continuous drive shaft which should be a continuous integral shaft, and can be applied to an existing load tap changer. Another object of the present invention is to provide an abnormality diagnosis device for an operation mechanism of an electric device, which can be easily applied without any modification, and can perform abnormality diagnosis of tap switching at the time of load with one torque sensor.

[0025]

A first aspect of the present invention is a drive device with a built-in torque sensor for detecting a torque generated on a drive shaft of an electric device operating mechanism and determining an abnormality diagnosis.
The configuration first comprises a first frame and a second frame arranged coaxially. The first frame and the second frame may be quadrangular or circular frames as shown in FIG. 2, and are preferably similar to each other. Further, if the coaxial shape is used, the positional relationship between the inner frame and the outer frame on the same plane can be determined even if the inner frame and the outer frame are in the same plane.
As shown in FIG. 1 of JP-A-07-07, it may be on a parallel plane. And, between the first frame and the second frame, there is provided a connecting column, and the supporting column is provided with a strain detecting element such as a strain gauge. Furthermore, a rotary drive means such as an electric motor with a speed reduction mechanism is mounted on the first frame, and a joint socket capable of connecting an output shaft of the rotary drive means to a drive shaft (a handle shaft for manual operation) of an operation mechanism of the electric device. And the like.

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

According to a second aspect of the present invention, there is provided a data processing device for recording, analyzing, and diagnosing a torque waveform output from the strain detecting element, and analyzing an output waveform output from the strain detecting element by the data processing device to diagnose an abnormality. It is something to do.

According to a third aspect of the present invention, a protective housing for covering the entire rotation driving means is attached to the second frame.

A fourth aspect of the present invention is characterized in that a holder is attached to the second frame or the protective casing.

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

A sixth aspect of the present invention is characterized in that a switch for instructing the start and stop of the rotary driving means is mounted within a range where the fingers of the hands holding the pair of grips can reach.

According to a seventh aspect of the present invention, a universal joint is provided between the output shaft of the rotary driving means and the connecting means.

According to the eighth aspect of the present invention, the rotary drive means is supported by a monopod or a tripod.

According to a ninth aspect of the present invention, the rotation driving means is held by a support arm which can be attached to a housing or the like of an operation mechanism of the electric device.

According to a tenth aspect of the present invention, the switch for instructing the start / stop of the rotary driving means is a foot-operated switch.

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

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment 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 an abnormality diagnosis device for a tap changer under load. A transformer tank 1 accommodates a tap changer 2 under load.
The on-load tap changer 2 is switched by an operation mechanism 3. The operating mechanism 3 and the on-load tap changer 2 are connected by a connecting drive shaft group 4, which serves to transmit the driving force of the operating mechanism 3 to the on-load tap changer 2. Play. The operation mechanism 3 has a built-in electric motor 5 for electric operation.
Is a handle shaft 6 for manual operation, and an electric motor 5 for electric operation.
In addition, a speed reduction mechanism 7 for reducing the rotation of the handle shaft 6 for manual operation to a rotation speed suitable for driving the load tap changer 2 and an output drive shaft 8 of the speed reduction mechanism 7 are provided.

The connection drive shaft group 4 is composed of a vertical connection drive shaft 9 and a horizontal connection drive shaft 10, and the transmission of the driving force from the vertical connection drive shaft 9 to the horizontal connection drive shaft 10 is provided at a connection point between the two. This is performed via the direction changing gear box 11. The lower end of the vertically connected drive shaft 9 is connected to the output drive shaft 8 provided on the operation mechanism 3. The output shaft of the drive unit 12 with a built-in torque sensor 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.

FIGS. 2, 3, 4, and 5 are a front view, a side view, a plan view, and a perspective view, respectively, showing the structure of the driving device 12 with a built-in torque sensor. FIG. A
7 is a sectional view taken along line BB of FIG. The driving device 12 with a built-in torque sensor has a square inner frame 14,
The inner frame 14 is constituted by an outer frame 15 having the same rectangular shape arranged coaxially with the inner frame 14, a column 16 for connecting the inner frame 14 and the outer frame 15 and fixing them together, and a strain gauge 17 attached to the column 16. An output signal line 18 is drawn from the strain gauge 17.

The inner frame 14 has a motor 19 with a speed reduction mechanism.
The motor 19 with a speed reduction mechanism is provided with an output shaft 20 coaxial with the inner frame 14 and the outer frame 15, and the motor 19 with a speed reduction mechanism is provided with a power cord 21 for operating the motor. It is connected. A joint socket 22 is attached to the tip of an output shaft 20 of the motor 19 with a speed reduction mechanism. The joint socket 22 is formed so as to be inserted into the handle shaft 6 for manual operation of the operation mechanism 3. A pair of handles 23 serving as holders are attached to the outer frame 15, and a power switch 24 for turning on / off the power is attached to the pair of handles 23. The power switch 24 is connected to a power cord. 21 is inserted and connected. The power switch 24
Is mounted within a range where the fingers of the hands 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 performing an abnormality diagnosis of the load tap changer 2,
First, the power cord 21 of the drive device 12 with a built-in torque sensor
Are connected to the power supply, and the output signal line 18 is connected to the data processing device 13, respectively. Next, as shown in FIG. 5, the pair of grips 23 are gripped by both hands to hold the torque sensor built-in drive unit 12, and the joint socket 22 attached to the end of the output shaft 20 of the motor 19 with the speed reduction mechanism is operated by the operation mechanism. 3 is inserted into the handle shaft 6 for manual operation attached to 3. And
When the power is turned on by pressing the power switch 24 of the torque sensor built-in drive device 12 with a finger, the electric motor 19 with the speed reduction mechanism starts rotating, and thus the output shaft 20 rotates, thereby starting to drive the handle shaft 6 for manual operation. . When the handle shaft 6 for manual operation starts to rotate, the rotation is reduced to a rotational speed suitable for driving the on-load tap changer 2 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 on-load tap changer 2 via the longitudinally connected drive shaft 9, the direction change gear 11, and the horizontally connected drive shaft 10 connected thereto, whereby the on-load tap changer 2 is transmitted. Is switched.

When the tapping operation is performed by driving the handle shaft 6 for manual operation by the electric motor 19 with the speed reduction mechanism of the drive device 12 with a built-in torque sensor, a counter torque equal to the driving torque is output via the handle shaft 6 to the output shaft. 20, transmitted to the motor 19 with the speed reduction mechanism, and sequentially transmitted from the inner frame 14 on which the motor 19 with the speed reduction mechanism is mounted to the outer frame 15 via the support 16 to operate. This counter torque is finally supported by the hand of the operator holding the pair of handles 23. The strain gauge 17 attached to the column 16 detects the distortion of the column 16 corresponding to the counter torque equal to the driving torque and outputs the waveform. The output waveform is output signal line 18.
Is transmitted to the data processing unit 13 where, 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,
When the drive device with a built-in torque sensor is mounted and driven on the handle shaft 6 for manual operation when a diagnosis is required, the torque waveform is measured. Therefore, not only the new load tap changer but also the existing load tap It can be applied to the switch without any special modification. In addition, since it is a wearable type when necessary, it can be diagnosed with any number of load tap changers with one abnormality diagnosis device if it is carried in pairs with the analyzer.

The torque sensor built in the torque sensor built-in drive unit 12 is of an anti-torque detection type, and the strain gauge 17 is attached to the support 16 of the torque sensor frame, which is a stationary part. , Strain gauge 17
Can be directly extracted without passing through a slip ring as in the case where is mounted on a rotating shaft, so that 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 holding tool is attached are directly attached to the outer frame 15, but as shown in FIG. A protective housing 25 is provided to cover the
Alternatively, the power switch 27 may be attached.

With the above-described configuration, the motor 19 with the speed reduction mechanism can be protected by the protection housing 25, and the position of the center of gravity of the entire drive unit 12 with the built-in torque sensor is searched to mount the pair of handles 26 at the optimum position. This makes it easier for the operator to hold it.

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

In this case, the electric motor 19 with the speed reduction mechanism can be protected by the protective housing 25 as in the case of the second embodiment, and furthermore, in this embodiment, the protective housing 25 can be protected by the protective housing 25 as in the case of the second embodiment. Since the anti-torque caused by the driving does not work, it is not necessary to consider the strength of the protective housing 25, and the cost for manufacturing the device can be reduced.

Embodiment 4 Embodiments 1, 2, and 3
In the abnormality diagnosis device of the tap changer at load due to
Only the joint socket 22 is connected to the tip of the output shaft 20 of the torque sensor built-in drive unit 12. However, in this case, the manual handle shaft 6 and the torque sensor built-in drive unit 1 are connected.
If there is a mismatch between the axis centers of the second output shaft 20, there is a disadvantage that an unstable torque waveform having torque fluctuation noise results. Therefore, as shown in FIG. 9, a universal joint (universal joint) 28 may be inserted between the output shaft 20 and the socket 22 in series.

With the above construction, even if the handle shaft 6 for manual operation does not match the axis of the driving device 12 with the built-in torque sensor held by the operator, the misalignment of the axis with the universal joint 28 does not occur. Since it is absorbed, there is an effect that a stable torque waveform without torque fluctuation noise due to mismatch of the axis can be obtained. The universal joint 28 used is a commercially available one.

Embodiment 5 FIG. In the device according to the first to fourth embodiments, the driving device 12 with a built-in torque sensor is used.
In this case, a pair of handles 23 and 26 are provided as holders so that the operator can hold the handle by hand. However, as shown in FIGS. 10 and 11, in addition to the pair of handles 23 and 26, A monopod 29 or a tripod 30 may be added. In this case, the self-weight of the torque sensor built-in drive device 12 can be supported by the monopod 29 or the tripod 30, so that the operator only needs to attach the hands to the handles 23 and 26 only to prevent falling. Therefore, the burden on the operator is reduced. Further, since the holding height of the torque sensor built-in driving device 12 is stabilized by the monopod 29 or the tripod 30, there is an effect that stable measurement can be performed.

Embodiment 6 FIG. In the devices according to the first to fifth embodiments, the driving device 1 with a built-in torque sensor
2 shows a case where a pair of handles 23 and 26 are provided as holding tools so that the operator can hold the hand 2 manually.
As shown in FIG. 12, instead of the pair of handles 23 and 26, the driving device 12 with the built-in torque sensor may be held by a support arm 31 that is seated on a housing of the operation mechanism 3. In FIG. 12, four support arms 3 attached to the outer frame 15 are shown.
1 holds the driving device 12 with a 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-described configuration, the operator does not need to hold the driving device 12 with the built-in torque sensor, thereby reducing the burden on the operator and stabilizing the holding, thereby enabling stable measurement. It has the effect of becoming.

Embodiment 7 FIG. In the devices according to the first to sixth embodiments, the driving device 12 with a built-in torque sensor is used.
The power switch 24 or 27 of the driving device 1
The pair of grips 23 or the protective housing 25 is mounted on the pair of handles 23 or the protective housing 25 so as to be operated by the hand while holding the switch 2. Alternatively, a foot-operated switch may be inserted in the power cord 21.

In this case, since the power switch can be turned on and off with the foot, the operator's hand can concentrate on holding the driving device 12 with the built-in torque sensor.
There is an effect that stable holding becomes possible, and thus stable measurement becomes possible.

Embodiment 8 FIG. In the devices according to the first to seventh embodiments, the driving device 1 with a built-in torque sensor
Although the type of the motor 19 with the speed reduction mechanism to be used has not been specified, the use of the servomotor with the speed reduction mechanism as the motor with the speed reduction mechanism does not require a constant rotation speed regardless of the change in the load torque. Measurement becomes possible. As a result, a stable and accurate output waveform is obtained at a point corresponding to the passage of time, and there is an effect that it is possible to accurately analyze how much torque is generated at which rotational angle.

Other Embodiments In the devices according to the first to eighth embodiments, the abnormality diagnosis device for the on-load tap changer has been described as an example. However, any device having the handle shaft 6 for manual operation as in the above embodiment may be used. Needless to say, the present invention can be used as an abnormality diagnosis device for an operating mechanism of other electrical devices such as a disconnector and a circuit breaker in the same configuration as that shown in the above embodiment.

[0058]

According to the first and second aspects of the present invention,
There is no need to cut off the connection drive shaft of the electric device operating mechanism, for example, the connection drive shaft of the on-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 operation mechanism such as the load tap changer. Further, the present invention can be applied to an existing electric device operation mechanism (a tap changer at load) without any modification. Furthermore, the drive shaft of the electric device operation mechanism,
For example, since connection can be made by inserting it into the handle shaft or the like, if it rotates, it is possible to diagnose many load tap changers with one abnormality diagnosis device, which is extremely economical. In this way, when it is desired to periodically perform abnormality diagnosis using the opportunity of the periodic inspection or the like, this rotating method has a very high practical effect. In addition, since the strain detecting element is attached to the column of the torque detecting frame, which is a stationary part, its output signal is directly transmitted without passing through a slip ring as in the case where the strain detecting element is mounted on a rotating shaft. It can be extracted and 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 that covers the entire rotary driving means is attached, the protective housing can protect the rotary driving means such as a motor with a speed reduction mechanism, and has a built-in torque sensor. Since the position of the center of gravity of the entire drive device can be found and the holder (a pair of grips) can be mounted at an optimum position, the operator can easily hold the device.

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

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

According to the sixth aspect of the present invention, since the power switch is mounted within a range where the fingers of the hands holding the pair of grips can reach, there is an effect that the operation becomes easy.

According to the seventh aspect of the present invention, 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 driving device with a built-in torque sensor held by the operator. Even if there is a discrepancy in the heart, the discrepancy of the shaft center is absorbed by this free joint, and there is an effect that a stable torque waveform without torque fluctuation noise due to the discrepancy of the shaft center can be obtained.

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

According to the ninth aspect of the present invention, since the rotary drive means is held by the support arm which can be attached to the housing or the like of the operation mechanism of the electric device, it is necessary for the operator to hold the drive device with the built-in torque sensor. Is eliminated, the burden on the operator is reduced, and the holding is stabilized, resulting in an effect that stable measurement is possible.

According to the tenth aspect of the present invention, since the switch for instructing the start and stop of the rotary drive means is a foot-operated type, the power switch can be turned on and off with a foot, so that the operator's hand can be operated. It is possible to concentrate on holding the driving device with the built-in torque sensor, and it is possible to stably hold the driving device, and therefore, it is possible to obtain a stable measurement.

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

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an entire abnormality diagnostic apparatus for a tap changer under load according to Embodiment 1 of the present invention;

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

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

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

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

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

FIG. 7 is a sectional view taken along line AA in FIG. 2;

FIG. 8 is a sectional view taken along line BB in FIG. 2;

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

FIG. 10 is a plan view showing a configuration of a driving device with a built-in torque sensor according to a fifth embodiment of the present invention.

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

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

FIG. 13 is a block diagram showing a conventional abnormality diagnosis 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 abnormality diagnostic apparatus for a conventional tap changer under load.

[Explanation of symbols]

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

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kunio Emoto 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Inside (72) Inventor Kazunari Higuchi 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Chubu Electric Power Stock In company

Claims (11)

[Claims] An apparatus for judging abnormality by detecting a torque generated in a drive shaft of an electric device operating mechanism, comprising: a first frame and a second frame coaxially arranged; A column connecting the two frames, a strain detection element installed on the column, a rotation driving unit mounted on the first frame and having an output shaft, and driving the output shaft of the rotation driving unit to the operation mechanism. A connection means connectable to a shaft, wherein the rotation drive means rotates the drive shaft, and detects torque from the drive shaft by the strain detecting element. apparatus. 2. The apparatus for diagnosing abnormality of an electric device operating mechanism according to claim 1, further comprising a data processing device for recording, analyzing, and diagnosing a torque waveform output from said strain detecting element. 3. The abnormality diagnosis device for an electric device operating mechanism according to claim 1, wherein a protection housing for covering the entire rotation driving means is attached to the second frame. 4. The apparatus for diagnosing abnormality of an electric device operating mechanism according to claim 1, wherein a holder is attached to the second frame or the protective housing. 5. The abnormality diagnosing device for an electric device operating mechanism according to claim 4, wherein a pair of grips is used as the holder. 6. The electrical device operating mechanism according to claim 5, wherein a switch for instructing the rotation drive means to start and stop is mounted within a range where fingers of a hand holding a pair of grips can reach. Abnormality diagnosis device. 7. An abnormality of the electric device operating mechanism according to claim 1, wherein a universal joint is provided between an output shaft of said rotary drive means and said connecting means. Diagnostic device. 8. The abnormality diagnosis device for an electric device operating mechanism according to claim 1, wherein the rotation drive unit is supported by a monopod or a tripod. 9. The electric device operation mechanism according to claim 1, wherein the rotation drive unit is held by a support arm attachable to a housing or the like of the operation mechanism. Abnormality diagnosis device. 10. The switch for instructing the rotation drive means to start and stop is a foot-operated switch.
The abnormality diagnosis device for an electric device operating mechanism according to any one of claims 1 to 5, and any one of claims 7 to 9. 11. The abnormality diagnosis device for an electric device operating mechanism according to claim 1, wherein a servomotor with a speed reduction mechanism is used as said rotation driving means.