JP3590671B2 - Tap switching device under load - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an on-load tap switching device, and more particularly to an on-load tap switching device provided with a manual torque detecting unit.
[0002]
[Prior art]
The on-load tap switching device provided in the transformer switches the tap provided in the transformer when the load of the transmission and distribution system fluctuates and a voltage change due to the fluctuation exceeds a certain limit. The side voltage is kept constant. As a specific configuration, it has mechanical contacts for tapping the transformer, and further has an operation mechanism for moving the contacts. Must be able to detect Therefore, as one of the detection methods, a method of detecting the operating torque of the on-load tap switching device with a torque detector is generally known. Hereinafter, a configuration of a conventional on-load tap switching device including a torque detector will be described with reference to FIG.
[0003]
In the transformer tank 1, there are provided a switching switch 2 having an interrupting mechanism for opening and closing a transformer load current at high speed, and a tap selector 3 for selecting a tap of a tap winding in conjunction with the switching switch 2. The loaded tap changer 4 is accommodated. The on-load tap changer 4 is provided with a rotational force from a motor 6 housed in an electric operation mechanism 5 or a manual operation of a manual operation handle 8 connected to a manual operation drive shaft 7 via a coupling 21. Driven by force. That is, the rotational force is transmitted from the gears 9a, 9b or the manual operation drive shaft 7 in the electric operation mechanism 5 to the drive shaft 10a, and further to the drive shafts 10b, 10c and the bevel gear devices 11a, 11b outside the electric operation mechanism 5. The load is transmitted to the tap changer 4 under load. The torque sensor 12 is attached to the drive shaft 10a in the electric operation mechanism 5, and measures the operating torque of the on-load tap changer 4 operated by transmitting the rotational force. Here, the measured torque signal is A / D-converted by an A / D converter 13 installed in the electric operation mechanism 5 and input to a torque output device 14, which then calculates / determines via a transmission cable 15. It is output to the unit 16 and performs arithmetic processing and abnormality determination.
[0004]
[Problems to be solved by the invention]
However, since the torque sensor 12 is mounted on a rotating drive shaft due to its characteristics, it can be easily mounted on a new product. However, it is very difficult to mount the torque sensor 12 on an existing on-load tap switching device. Required significant remodeling. Further, a storage case is required to prevent the external environment from being affected by the wind and rain. However, a storage case is not necessary if it is attached to the drive shaft 10a in the electric operation mechanism 5, but the existing electric operation mechanism is not designed on the assumption that the torque sensor 12 is installed. Therefore, there is usually no installation space. Therefore, it is necessary to take measures such as changing the arrangement of devices or replacing the electric operation mechanism storage box with a large one. Further, in the case of attaching to a drive shaft system in oil, a modification must be performed in which a cable lead-out part for leading out torque data to an external calculation / judgment part is newly installed on the outer wall of the tank. For such remodeling, it was necessary to make a large remodeling of the drive shaft part by temporarily stopping the load tap changer 4 or the like. However, the suspension of the tap changer 4 at the time of load is not desirable because it may impair the reliability of the transmission and distribution system.
[0005]
Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a manual torque detector that can be easily installed in an existing load tap changer. That is.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides, as an invention according to claim 1, a switching switch having an interruption mechanism for opening and closing a transformer load current, and a tap of a tap winding in conjunction with the switching switch. A load tap changer having a tap selector to be selected, an electric operating mechanism for driving the load tap changer by the rotational force of a motor housed therein, and a rotation by manual operation connected to the electric operating mechanism. A detachable manual operation handle for driving the on-load tap changer by force; and
A portable torque detector configured by incorporating a torque sensor into the manual operation handle, a rotation detector that detects the number of rotations of the manual operation handle, and output by the portable torque detector and the rotation detector. An A / D converter for A / D converting the output signal to be output, and a calculation / determination unit for performing arithmetic processing and abnormality determination based on the output signal converted by the A / D converter. A switching device is provided.
[0007]
According to a second aspect of the present invention, there is provided a transmitter that transmits an output signal output from the portable torque detector as a radio wave, a receiver that receives a radio signal from the transmitter, and a receiver that receives the radio signal. 2. The A / D converter according to claim 1, further comprising: an A / D converter for A / D converting the converted signal; and a calculation / determination unit for performing calculation processing and abnormality determination based on the converted signal. An on-load tap switching device is provided.
[0008]
Further, as the invention according to claim 3, a transmitter for transmitting an output signal output from the portable torque detector and the rotation detector as a radio wave, and a receiver for receiving a radio wave signal from the transmitter. An A / D converter for A / D converting a signal received by the receiver, and a calculation / determination unit for performing calculation processing and abnormality determination based on the signal converted by the A / D converter. An on-load tap switching device according to claim 1 is provided.
[0009]
Further, as the invention according to claim 4, the calculation / determination unit includes an inertia torque calculation unit that calculates an inertia torque based on rotation speed data from the rotation detector, and torque data from the portable torque detector. A correction torque calculation unit that calculates an actual operation torque value based on the above, a storage unit that stores a determination value of an operation time and an operation torque serving as a reference of the on-load tap changer, 4. An on-load tap according to claim 1, further comprising: an abnormality judging section for judging the presence or absence of an abnormality in the operating torque by comparing the operating torque value of the motor or the rotation speed data. A switching device is provided.
[0010]
[Action]
According to the first aspect of the present invention having such a configuration, it is possible to easily attach a manual torque detector to the existing tap switching device under load.
According to the second aspect of the present invention, a wireless system is adopted as a signal transmission system, so that a receiver having an A / D converter and an operation / judgment unit is integrated into one unit as long as the signal can be received. And the degree of freedom in design can be increased.
[0011]
The invention according to claim 3 employs a wireless system as a signal transmission system and further adds a rotation detector signal to the wireless signal, so that a manual torque detector can be easily attached to an existing load tap changer. As long as the function of claim 1 is obtained and the radio wave can be received, the receiving unit having the A / D converter and the calculation / judgment unit can be integrated into one unit. It is possible to obtain an effect that can be enhanced in combination with claim 2.
According to the fourth aspect of the invention, by adopting such a system, it is possible to correct unevenness in load caused by a manual operation.
[0012]
【Example】
Hereinafter, an embodiment of the on-load tap switching device according to the present invention will be described with reference to FIG. The same parts as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted.
A portable torque detector 17 in which the torque sensor 12 is incorporated in the manual operation handle 8 is fixed to a fixed base 18 so as not to be linked with the rotation of the manual operation handle 8. Further, this is connected to the drive shaft 7 for manual operation via the coupling 21 and operated. The portable torque detector 17 also has a rotation detector 19, and detects the driving torque generated by the manual operation handle 8 and the number of rotations thereof. The torque data and the rotation speed data detected by these are output to the A / D converter 13 via a transmission cable or the like, where they are A / D converted, and then passed through the torque output device 14 or the rotation speed output device 20. The result is output to the calculation / determination unit 16. Then, in the calculation / determination unit 16, a calculation process combining the rotation speed data and the torque data and an abnormality determination are performed.
[0013]
In the on-load tap switching device having such a configuration, a portable torque detector 17 in which a torque sensor 12 is incorporated in a handle 8 for manual operation is combined with a drive shaft for manual operation provided in the existing electric operation mechanism 5. Therefore, when the load tap changer 4 is manually operated, the torque detector can be easily attached simply by replacing the operation handle 8 connected via the coupling 21 with the portable torque detector 17. It becomes. In addition, since rotation speed data is taken in in addition to the torque data, in addition to a simple comparison between a generated torque and a reference value, an advanced determination that can detect an abnormality from the correlation between the rotation angle and the torque is performed. It becomes possible.
[0014]
A second embodiment of the present invention will be described with reference to FIG.
The present embodiment is characterized in that the portable torque detector 17 includes the transmitter 40. The transmitter 40 transmits the detected torque signal by radio waves. This radio wave is received by the receiver 41 connected to the calculation / determination unit 16. The received signal is A / D converted by the A / D converter 13 and output to the calculation / determination unit 16.
[0015]
In the on-load tap switching device having such a configuration, since the transmitter 40 is combined with the portable torque detector 17, the A / D converter 13 which had to be installed near the torque detector conventionally, It is only necessary to install it near the remote calculation / judgment unit, and it is not necessary to use an output device or a transmission cable. Therefore, at the time of torque detection, it is sufficient to carry only the portable torque detector 17 in the electric operation mechanism 5, The configuration is excellent in portability. Further, in a power plant or a substation in which several transformers 60 are installed as shown in FIG. 6, according to the conventional method, the A / D converter 13 and the operation / judgment are made for each of the transformers. In this embodiment, the A / D converter 13 and the calculation / judgment unit 16 are required as long as they are within the receivable range of radio waves by partially adopting wireless as a signal transmission method in this embodiment. 16 can be integrated into one unit, and the receiving unit can be downsized. Therefore, the degree of freedom in designing the substation as a whole can be increased.
[0016]
Further, a third embodiment of the present invention will be described with reference to FIG.
The present embodiment is characterized in that a rotation detector 19 is further provided in the portable torque detector 17 provided with the transmitter 40. The torque data and the rotation speed data detected by these detectors are transmitted from the transmitter 40 by radio waves. The radio waves are respectively received by the receivers 41 connected to the calculation / judgment unit 16, A / D converted by the A / D converter 13, and output to the calculation / judgment unit 16.
[0017]
In the on-load tap switching device having such a configuration, since the rotation detector 19 is combined with the portable torque detector 17, similarly to the first embodiment, the altitude at which abnormality can be detected from the correlation between the rotation angle and the torque is used. It is possible to make an appropriate determination. In addition, by providing the transmitter 40 as in the second embodiment, the configuration is excellent in portability, and the receiving unit having the A / D converter 13 and the calculation / determination unit 16 is integrated into one unit. Can be integrated.
[0018]
Further, the embodiment shown in FIG. 4 shows the configuration of the calculation / determination unit 16 for calculating / determining the torque data and the rotation speed data output from the portable torque detector 17 and the rotation detector 19. .
[0019]
Data output from the torque detector 17 mounted on the rotation detector 19 to the calculation / determination unit 16 includes torque data 50 and rotation speed data 51. First, an inertia torque value generated at the time of manual operation is calculated by an inertia torque calculation unit 52 from the rotation speed data 51 taken into the calculation / determination unit 16. Then, the calculated inertia torque value is combined with the torque data 50 sent from the portable torque detector 17 by the correction torque calculation unit 53 to calculate the actual torque generated by the operation of the on-load tap changer 4. Calculate the value. On the other hand, the abnormality determination unit 55 performs the abnormality determination by comparing the actual torque value calculated in this way with the determination value as the reference value stored in the storage unit 54. Furthermore, the rotation speed data 51 is read, the operation time is calculated based on the rotation speed from the operation start point, the torque value at that time is calculated, and compared with the determination value for each operation time stored in the storage unit 54. Perform an abnormality determination.
[0020]
In the embodiment having such a configuration, it is possible to correct unevenness in load caused by manual operation. That is, when the load tap changer 4 is operated by being driven by the normal motor 6, the tap changer 4 is driven at a substantially constant angular velocity, so that the angular acceleration becomes substantially zero and the variation in the detected torque value is reduced. However, when the motor 6 is operated by a manual operation, the angular velocity varies and the angular acceleration also varies. Therefore, it is necessary to consider the influence of the change in the inertial force, which need not be considered in the operation of the motor 6. Therefore, the inertial torque calculation unit 52 obtains the angular acceleration ω ′ of the steering wheel at the time of manual operation by measuring the fluctuation value per unit time of the rotation speed, and calculates the inertial torque value Tz for each detected torque data as follows. It is calculated by the formula.
[0021]
Tz = I × ω '
I: Moment of inertia of torque detecting section Next, the corrected torque calculating section 53 combines the measured torque value with the inertial torque value at each time when the torque is measured, and calculates the actual torque value generated in the on-load tap switching device 4. Is calculated. The actual torque value To is calculated by the following equation.
[0022]
To = Ta ± Tz
Ta: the measured torque value detected by the torque detector provided in the manual operation unit The actual torque value calculated in this way is within the normal range of the upper limit or lower limit determination value stored in the storage unit by the determination unit 55. By confirming that, an abnormality is determined. As a result, accurate torque detection can be performed even with a manual operation that varies.
[0023]
In addition, the torque waveform as shown in FIG. 5 can be obtained by reading the drive shaft rotation angle during operation of the on-load tap changer 4 from the rotation speed data with time. On the other hand, if the storage unit 54 stores typical operation times such as the ON / OFF operation points 63 and 64 of the contacts of the tap selector 3 and the switching switch operation point 65 of the switching switch 2, the diagram will As shown in FIG. 5, it is possible to identify at which operation of the on-load tap changer each detected torque value is an operating torque generated. By providing a determination value in the storage unit 54 for each operation area for performing this identification, an abnormality determination is performed for each operation, and when an abnormal torque is generated, it is possible to specify at which operation point the abnormality is occurring. This makes it possible to make a diagnosis with a more accurate torque.
[0024]
【The invention's effect】
As described above, according to the present invention, the existing on-load tap changer can be operated manually by combining a portable torque detector with a drive shaft for manual operation to perform torque detection. If this is the case, it is possible to easily detect the operating torque without significant modification.
[Brief description of the drawings]
FIG. 1 is a structural sectional view of an on-load tap switching device according to a first embodiment of the present invention.
FIG. 2 is a structural sectional view of a tap change device under load according to a second embodiment of the present invention.
FIG. 3 is a structural sectional view of an on-load tap switching device according to a third embodiment of the present invention.
FIG. 4 is a block diagram showing a system configuration of a calculation / determination unit according to the present invention.
FIG. 5 is a diagram illustrating an output waveform of a driving torque generated in a load tap switching device.
FIG. 6 is a diagram showing an application example of the second and third embodiments of the present invention.
FIG. 7 is a structural cross-sectional view of a conventional load tap switching device.
[Explanation of symbols]
2 switching switch, 3 tap selector, 4 load tap switch, 5 electric operating mechanism, 6 motor, 8 manual handle, 12 torque sensor, 13 A / D converter, 16 calculation / determination unit, 17 portable torque detector, 19 rotation detector, 40 transmitter, 41 receiver, 50 torque data, 51 rotation speed data, 52 inertia torque calculation unit, 53 ... Correction torque calculation section, 54... Storage section, 55.

Claims (4)

A switching tap having a switching mechanism for opening and closing a transformer load current, and a load tap switching switch including a tap selector for selecting a tap of a tap winding in conjunction with the switching switch, and housed inside. An electric operating mechanism that drives the on-load tap changer by a rotational force of a motor; a detachable manual operation handle that is connected to the electric operating mechanism and drives the on-load tap changer by a rotational force by manual operation; In the on-load tap switching device provided with
A portable torque detector configured by incorporating a torque sensor into the manual operation handle, a rotation detector that detects the number of rotations of the manual operation handle, and output by the portable torque detector and the rotation detector. An A / D converter for A / D converting the output signal to be output, and a calculation / determination unit for performing arithmetic processing and abnormality determination based on the output signal converted by the A / D converter. Switching device. A transmitter for transmitting an output signal output from the portable torque detector as a radio wave, a receiver for receiving a radio wave signal from the transmitter, and an A / D converter for A / D converting a signal received by the receiver The on-load tap switching device according to claim 1, further comprising: a / D converter; and a calculation / determination unit that performs calculation processing and abnormality determination based on the signal converted by the / D converter. A transmitter that transmits an output signal output from the portable torque detector and the rotation detector as a radio wave, a receiver that receives a radio wave signal from the transmitter, and a signal that is received by the receiver. 2. An on-load tap switch according to claim 1, further comprising an A / D converter for performing A / D conversion, and a calculation / determination unit for performing arithmetic processing and abnormality determination based on the signal converted by the A / D converter. apparatus. The calculation / determination unit calculates an actual operation torque value based on an inertia torque calculation unit that calculates an inertia torque based on rotation speed data from the rotation detector and torque data from the portable torque detector. A correction torque calculation unit, and a storage unit that stores a reference value of an operation time and an operation torque serving as a reference of the on-load tap changer, and the determination value and the actual operation torque value or the rotation speed data. 4. The on-load tap switching device according to claim 1, further comprising: an abnormality determining unit that determines whether there is an abnormality in the operating torque by comparing the operation taps.

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