JP2000223331A - Load-time tap switcher, its control method, and recording medium with its control program recorded therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide with a simplified structure a load-time tap switcher which can reduce the occurrence of wears or a contact failures with few movable parts, is high in reliability, taking into consideration the characteristic of electrical and electronic element, and can make stable operation. SOLUTION: A load-time tap switching device 1 is constituted by a transformer load-time tap switcher 2 and an electric operation controller 3. The electric operation controller 3 is provided with a motor 8, a decelerating mechanism 9, a no-fuse breaker 15, a drive circuit 21, rotary encodes 22a, 22b, control means 23, display means 24, and a door switch. The drive circuit 21 is provided with a triac, a phototriac, and a photocoupler. The control means 23 is provided with a first microprocessor, a second microprocessor, a program recording medium, a nonvolatile memory element, a data bus, and an interface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-load tap switching device for performing tap switching of a transformer, a control method thereof, and a recording medium storing a control program therefor.

[0002]

2. Description of the Related Art In a modern society in which demand for electric power has increased dramatically, stable supply of electric power is one of important issues. Therefore, various improvements have been made in substation equipment for supplying power, with the aim of improving reliability. One of such substation equipment is a load for adjusting and stabilizing the voltage of the transmission and distribution system. An hour tap switching device is used.

[0003] As such a tap change device under load,
One example conventionally used is described below with reference to FIG. FIG. 9 is a block diagram showing a configuration example of a substation facility including a load tap switching device. That is, the on-load tap switching device 1 includes the on-load tap switching device 2 connected to the on-load tap switching transformer 7 of the power transmission and distribution system.
And an electric operation control device 3 for driving the same. The electric operation control device 3 includes an electric motor 8, a speed reduction mechanism 9, a stepping mechanism 10, an extreme stop mechanism 11, an instruction mechanism 12,
It comprises a control circuit 13, an electromagnetic relay 14, a no-fuse breaker 15, and the like.

[0004] The electric motor 8 generates power necessary for the operation of the on-load tap changer 2. The reduction mechanism 9 is a mechanism that reduces the rotation of the electric motor 8 and transmits the rotation to the drive shaft 17 of the on-load tap changer 2. This drive shaft 17 is
One rotation per tap change. The stepping mechanism 10 is a mechanism that mechanically generates the timing of tap switching control using gears, cams, and the like based on the rotation of the drive shaft 17.
The limit stop mechanism 11 is a mechanism for preventing switching exceeding the limit. The instruction mechanism 12 is a mechanism for displaying a tap position, the number of times of switching, and the like. The control circuit 13 is a circuit for controlling the electric motor 8, and is configured by combining electromagnetic relays and switches. The electromagnetic relay 14 is provided in the power supply circuit of the electric motor 8 together with the no-fuse breaker 15,
6 is a relay that opens and closes directly.

Further, a transformer 5 is provided in the power transmission and distribution system, and is connected to the on-load tap switching device 1 via the host control device 6. The transformer 5 detects a change in the load 4 of the transmission and distribution system by detecting a voltage change amount. The host control device 6 is a device that creates a tap switching command in accordance with a detection value of the transformer 5.

The operation of the on-load tap switching device 1 having the above-described configuration is as follows. That is, when the load 4 of the transmission and distribution system fluctuates, the transformer 5 detects a voltage change amount corresponding to the fluctuation of the load 4. The host controller 6 creates a tap switching command of the on-load tap switching device when the voltage change amount becomes equal to or more than a certain value. The electric operation control device 3 closes the electromagnetic relay 14 and rotates the electric motor 8 in response to the tap switching command, so that the on-load tap switching device 2 is driven and the tap of the on-load tap switching transformer 7 is switched. At this time, the drive shaft 17 of the electric motor 8 makes one rotation per one tap change, but the stepping mechanism 10 determines, based on the rotation of the drive shaft 17, that the on-load tap changer 2 completes the tap change. A tap switching completion signal is generated. The control circuit 13 opens the electromagnetic relay 14 and stops the motor 8 in response to the tap switching completion signal.

As described above, by performing the tap switching of the on-load tap switching transformer 7, the voltage of the power transmission and distribution system can be kept constant. Switching beyond the limit is prevented by the limit stop mechanism 11, and the instruction mechanism 12 displays the tap position, the number of times of switching, and the like.

[0008]

Incidentally, the mechanical mechanism, the electromagnetic relay, the contact point of the switch, the indicating mechanism and the like constituting the electric operation control device of such a load tap switching device are subject to wear and poor contact. Likely to happen. In addition, the operation of electromagnetic relays is relatively slow, and the time from command input to operation completion is long, and the time varies.Therefore, in a control circuit using an electromagnetic relay, the stop position of the tap varies for each operation. Occurs and it is difficult to make it constant.

To cope with this, for example,
As described in Japanese Patent No. 18569, a load tap switching device in which a mechanical mechanism and a contact are replaced by electrical and electronic elements as much as possible has been developed. According to this conventional technique, the number of mechanical mechanisms and contacts is greatly reduced, so that the number of movable parts is reduced, the possibility of occurrence of wear and poor contact can be reduced, and reliability is improved. Further, since the configuration is simplified, both the production cost and the maintenance cost can be reduced.

However, in the above-described prior art, there are the following points to be improved. That is, as an example in which an electric or electronic element is applied, a semiconductor element may be used as an element for opening and closing the power supply to the electric motor. However, the main failure modes of the electromagnetic relay are poor contact and disconnection, whereas the main failure modes of the semiconductor element are short-circuit failures.

In addition, a single electromagnetic relay can simultaneously open and close a plurality of contacts, while a single semiconductor device has only one contact.
Only one.

Therefore, simply replacing an electromagnetic relay or the like with a semiconductor element may cause a problem of short-circuit failure or an increase in the number of semiconductor elements to be used, and may not always lead to improvement in reliability and simplification of the configuration. is there.

As another example in which electrical and electronic elements are applied, a control means for realizing a control sequence includes a microprocessor or a programmable controller.
It is conceivable to apply a controller. However, in this case, a malfunction may occur due to a mistake or destruction of the program.

Further, the information exchange between the on-load tap switching device 1 and the host control device 6 is performed by using one point of contact information corresponding to one state item to be notified, and one set of signal lines per one point. Since it is used as a parallel voltage signal and transmitted as a parallel voltage signal, the amount of wiring during that time is enormous. Moreover, since the connection voltage is usually 100 V or more, it is necessary to use a thick signal line having excellent insulation, which hinders simplification of the configuration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to reduce the number of movable parts and reduce the occurrence of abrasion and poor contact, as well as the characteristics of electrical and electronic elements. In view of the above, it is an object of the present invention to provide a load tap switching device which has high reliability and can operate stably with a simplified configuration, a control method thereof, and a recording medium on which the control program is recorded.

[0016]

In order to achieve the above object, a load tap changer of the present invention comprises a load tap changer, an electric motor for rotating a drive shaft of the load tap changer, A drive circuit that opens and closes a power supply to the electric motor, an angle detection unit that detects a rotation angle of the drive shaft, and the drive circuit that is controlled by a plurality of control signals based on an angle signal from the angle detection unit. The on-load tap switching device including the control means has the following technical features.

That is, according to the first aspect of the present invention, the drive circuit includes a plurality of semiconductor elements for opening and closing a power supply, and one combination of the plurality of semiconductor elements is a control signal of the control signal from the control means. The first control signal of the plurality of semiconductor elements is turned on, and the motor can be energized in the tap step-up direction or the step-down direction to the electric motor. The control signal is turned on by the second control signal among the control signals described above, and the motor can be energized in the tap step-down direction or the step-up direction. According to the first aspect of the present invention, a semiconductor element which operates at high speed and has small variations is used as an element for opening and closing the power supply of the electric motor. For this reason, the stop position of the tap can be controlled with higher accuracy than a control circuit using an electromagnetic relay or the like.

According to a second aspect of the present invention, in the load tap switching device according to the first aspect, the semiconductor element is a bidirectional thyristor. According to the second aspect of the present invention, the alternating current generally used as the power source of the electric operation control device of the on-load tap switching device can be opened and closed by one element of the bidirectional thyristor per phase, thereby simplifying the configuration of the drive circuit. Can be

According to a third aspect of the present invention, in the load tap switching device according to the first or second aspect, the drive circuit is turned on by the input of the first control signal and by the second control signal. The semiconductor element to be in a state,
A cutoff state regardless of the state of the second control signal,
The semiconductor device that is turned on by the first control signal by the input of the second control signal is configured to be turned off irrespective of the state of the first control signal. And According to the third aspect of the present invention, even when the second control signal is output during the output of the first control signal due to a malfunction of the control means, the second control in the drive circuit is performed. Since the semiconductor element corresponding to the signal is forcibly shut off, it is possible to prevent an accident such as a short circuit of the power supply or an intermediate stop of the tap. Further, even if the first control signal is output during the output of the second control signal, the same operation is achieved.

According to a fourth aspect of the present invention, in the load tap switching device according to any one of the first to third aspects, at least one of the combinations of the plurality of semiconductor elements is provided.
One is characterized in that it is made conductive by a third control signal of the control signals from the control means, and is capable of performing a short circuit between the phases of the electric motor. According to the fourth aspect of the present invention, when the motor is stopped, the third
By inputting the control signal, the phases of the motors are short-circuited and the motors can be braked, so that the stop position of the tap can be controlled with high accuracy.

According to a fifth aspect of the present invention, in the load tap switching device according to any one of the first to fourth aspects, the drive circuit is configured to control the first and the second control signals in response to the input of the third control signal. The semiconductor device that is turned on by the second control signal is configured to be turned off irrespective of the states of the first and second control signals. According to the fifth aspect of the present invention, even if the first or second control signal is output during the output of the third control signal due to a malfunction of the control means, the first and second control signals are output from the drive circuit. Since the semiconductor element corresponding to the second control signal is forcibly shut off, it is possible to prevent an accident such as a short circuit of the power supply or an intermediate stop of the tap.

According to a sixth aspect of the present invention, in the load tap switching device according to any one of the first to fifth aspects, the angle detecting means determines the angle of the drive shaft that makes one rotation per tap change. A first rotary encoder that outputs the signal as a signal; According to the sixth aspect of the present invention, precise tap switching control can be performed by a high-resolution angle signal obtained from the first rotary encoder.

According to a seventh aspect of the present invention, in the load tap changer according to the sixth aspect, the first rotary encoder is provided so as to be able to detect the number of revolutions of the drive shaft. . According to the seventh aspect of the present invention, the rotation speed of the drive shaft, that is, the tap position can be acquired from the first rotary encoder together with the high-resolution angle signal. By collating with the desired tap position, the reliability of the tap position control can be improved.

According to an eighth aspect of the present invention, in the load tap switching device according to the sixth or seventh aspect, the angle detecting means uses the angle of the shaft that has decelerated the drive shaft at a predetermined ratio as an angle signal. It has a second rotary encoder for outputting. According to the eighth aspect of the present invention, since a high-resolution angle signal for tap switching control can be obtained by the first rotary encoder, precise tap switching control can be performed.
Since the tap position can be independently acquired by the rotary encoder, the reliability of the tap position control can be improved by, for example, collating with the tap position information obtained from the tap control history by the control means. Also, 2
Since two rotary encoders are used, for example,
Even if the control unit compares the angle signals of the two rotary encoders with the state of the control signal and finds out that one of the rotary encoders has failed, the tap switching control is performed using the angle signals from the remaining normal rotary encoders. Can continue. Therefore, it is possible to avoid a situation in which tap switching cannot be performed due to a failure of the rotary encoder, and reliability is improved.

According to a ninth aspect of the present invention, in the load tap switching device according to the eighth aspect, the first and second rotary encoders are of an absolute angle detection type. According to the ninth aspect of the present invention, since the rotary encoder is of the absolute angle detection type, the angle signal directly corresponds to the state of the on-load tap changer irrespective of the past history. For this reason, even if the drive shaft angle or tap position changes due to manual operation during a power failure,
Just by automatically reading the angle signal of the rotary encoder immediately after the power is turned on again, the correct drive shaft angle and tap position can be set. Therefore, manual resetting becomes unnecessary, and reliability and practicality are improved.

According to a tenth aspect of the present invention, in the load tap switching device according to any one of the first to ninth aspects,
Manual state detection means for detecting that the on-load tap switching device is being manually operated is connected to the drive circuit and the control means, and the control means detects that the manual operation is being performed by the manual state detection means. And the drive circuit detects that the semiconductor element that is brought into conduction by the first and second control signals is being manually operated by the manual state detection means. During this time, the motor is cut off irrespective of the states of the first and second control signals, so that the motor cannot be energized. According to the tenth aspect of the present invention, even when the first or second control signal is output during the manual operation due to a malfunction of the control means or the like, the first and second control signals are output from the drive circuit. Since the semiconductor element corresponding to the signal is forcibly cut off, it is possible to prevent the motor from rotating.

The eleventh aspect of the present invention relates to the first to tenth aspects.
In the on-load tap switching device according to any one of the above, limit detection means for detecting that the tap position is at the upper limit and the lower limit is connected to the drive circuit and the control means, the control means, the limit means While the detection means detects that the tap position is at the upper limit or the lower limit, the transmission of the control signal is stopped, and the drive circuit is turned on and off by the first and second control signals. The semiconductor device is configured so as to be in a cut-off state irrespective of the states of the first and second control signals, so that the motor cannot be energized in the tap step-up or step-down direction. In the invention according to claim 11 described above, due to a malfunction of the control means or the like,
Even when a control signal for tap boosting is output in spite of the upper limit of the tap position, the semiconductor element corresponding to the first control signal is forcibly cut off in the drive circuit. Does not rotate in the tap boosting direction, and can prevent damage to the load tap changer. Note that the same operation is achieved when a control signal for tap voltage reduction is output despite the lower limit of the tap position.

The invention according to claim 12 is the invention according to claims 1 to 11
The load tap change device according to any one of the above, wherein the control means is connected to a display means for displaying information on tap change abnormality.
According to the twelfth aspect of the present invention, since the display means connected to the control means is used instead of the mechanical pointing mechanism, the number of mechanical mechanisms is reduced, the reliability is improved, and the configuration is simplified. In addition, when the tap changer under load cannot be operated due to tap limit, manual operation, or the like,
Since the reason can be displayed, maintainability and practicality are also improved. Further, by monitoring the internal state by the control means and displaying the abnormality as an alarm on the display means, there is a possibility that the abnormality can be found before the occurrence of an accident such as a tap intermediate stop, which further contributes to improvement in reliability. .

The invention according to claim 13 is the invention according to claims 1 to 12
5. The on-load tap switching device according to claim 1, wherein the control unit includes a data conversion unit that converts information indicating a state inside the on-load tap switching device into serial data. And In the invention according to the thirteenth aspect, a large number of contact information indicating the internal state of the device such as the state of the on-load tap changer such as the tap position and the operating state, and the soundness of the drive circuit is required. Even if you need more than one point of contact for information,
The contact information can be converted into serial data and transmitted via a single serial transmission path. Accordingly, the amount of wiring between the on-load tap switching device and the external device can be significantly reduced, and the substation equipment can be simplified.

The invention according to claim 14 is the invention according to claims 1 to 13
5. The on-load tap switching device according to claim 1, wherein the control unit includes at least one microprocessor for performing tap switching control and at least one microprocessor for performing processing other than tap switching control. It is characterized by. In the invention according to claim 14 described above, a dedicated microprocessor is used for tap switching that requires high-speed control. Therefore, processes other than tap switching, for example, processes such as display, setting, and contact output, are performed. The effect on tap switching control can be minimized,
The stop position of the tap can always be controlled with high accuracy. Further, since a plurality of microprocessors are used, for example, even if a failure of any one of the microprocessors is found by means such as a watchdog timer built in the control means, tapping is performed by the remaining normal microprocessors. Switching control can be continued. Therefore, it is possible to avoid a situation in which tap switching cannot be performed due to a failure of the microprocessor, and reliability is improved.

The invention according to claim 15 is the invention according to claims 1 to 14
In the on-load tap switching device according to any one of the above, a measurement unit that measures a power supply voltage or a power supply frequency of the electric motor, and a change that changes a set value related to the control signal based on a measurement result by the measurement unit. Means. In the invention according to claim 15 described above, based on the measurement result of the measuring means, for example, the setting value of the optimum angle or the optimum time relating to the start or stop of the control signal is programmed in advance by the changing means being experimentally determined. The settings are automatically changed by referring to the entered numerical table. Therefore, a highly practical on-load tap switching device that can be easily applied to substation facilities under various different conditions can be provided. Further, even if the power supply voltage or the power supply frequency fluctuates during the operation, it is possible to realize good tap switching control which is hardly affected by the fluctuation.

Next, according to the control method of the on-load tap changer of the present invention, the control means sends at least one of a plurality of control signals to the drive circuit based on the rotation angle of the drive shaft of the on-load tap changer. And the drive circuit, based on the control signal, controls the on-load tap switching device that opens and closes power supplied to the electric motor that rotates the drive shaft, and has the following technical features. .

That is, according to a sixteenth aspect of the present invention, the control means outputs the first control signal among the control signals.
Outputting to the drive circuit to energize the motor in the tap step-up or step-down direction; and when the rotation angle reaches a predetermined angle, the first
Stopping the control signal, and outputting a second control signal of the control signal to the drive circuit for a predetermined time after a predetermined time elapses, so that the motor is tapped in a step-down direction or step-up. Energizing in the direction. Claim 1 as described above
According to the invention described in the sixth aspect, when the motor is stopped, the motor is energized for a certain time so that a torque in the reverse direction to the rotation of the motor is generated, and the motor can be braked. Therefore, the stop position of the tap is controlled with high accuracy. be able to.

According to a seventeenth aspect of the present invention, in the control method of the on-load tap switching device according to the sixteenth aspect, the predetermined angle is 5 degrees to 30 degrees before a normal stop angle of the drive shaft. 30ms to 3 from stop of control signal 1
After a lapse of 00 ms, the second control signal is
It is characterized by outputting for a time of 30 ms to 70 ms. In the invention according to the seventeenth aspect, when the three-phase induction motor generally used for driving the on-load tap changer is controlled by the three-phase 200V power supply, the drive shaft is stabilized at the normal stop angle. Control to stop.

The invention according to claim 18 is such that the control means outputs the first control signal of the control signals to the drive circuit, thereby energizing the motor in a tap boosting direction or a step-down direction. Stopping the first control signal when the rotation angle reaches a predetermined angle; and, after a predetermined time has elapsed, changing a third control signal of the control signals to a predetermined time. Outputting a short circuit between the phases of the electric motor;
It is characterized by including.

In the invention according to claim 18 as described above,
When the motor stops, after the motor is disconnected from the power supply,
The phases of the motors are short-circuited for a certain time. Then, the energy of the rotational motion due to inertia is consumed by the short circuit, so that the electric motor can be braked and the stop position of the tap can be controlled with high accuracy.

According to a nineteenth aspect of the present invention, in the control method of the on-load tap switching device according to the eighteenth aspect, the third control signal is output for a predetermined time when the drive shaft does not stop. And Claim 19 as described above.
According to the invention described in the first embodiment, the first device is used due to a short-circuit failure of a semiconductor element or the like.
Alternatively, if the drive shaft does not stop even though the output of the second control signal is stopped and the control means detects this by the angle signal of the angle detection means, the third control signal is output for a fixed time. By doing so, the power of the motor is shut off and the motor stops, so that it is possible to prevent the accident from spreading.

The twentieth aspect of the present invention relates to the sixteenth to the first aspects.
10. The control method of the tap switching device at load according to any one of 9 above, wherein a set value related to the control signal is changed according to a power supply voltage or a power supply frequency for the electric motor. In the invention according to claim 20, the set value of the optimum angle or the optimum time for the start or stop of the control signal changes depending on the difference in the power supply voltage or the power supply frequency of the electric motor. By changing the set value based on the above, it is possible to realize a highly practical control method of the tap change device under load that can be easily applied to substation equipment under various conditions.

The invention of claim 21 is the invention of claims 16 to 2.
0, in the control method of the on-load tap switching device according to any one of 0, the control means obtains a tap position based on the angle signal or a history of tap control when the tap is stepped up or down, and the control is performed. The tap position obtained by the means is recorded in the storage means, and when the power is turned on again, the tap position recorded in the storage means is regarded as the current tap position. In the invention according to claim 21 described above, since the tap position is always recorded in the non-volatile storage means, even if a power failure occurs, the current tap is read from the non-volatile storage means immediately after the power is turned on again. Position can be set automatically. Therefore, there is no need for manual resetting, and reliability and practicability are improved.

Further, according to the present invention, based on the rotation angle of the drive shaft of the on-load tap changer,
The recording medium storing the control program of the on-load tap switching device for opening and closing the power supply of the electric motor rotating the drive shaft has the following technical features.

That is, in the invention according to a twenty-second aspect, the program causes the computer to energize the electric motor in a tap pressure increasing direction or a voltage decreasing direction according to a first control signal, and when the rotation angle reaches a predetermined angle. Stopping the first control signal, and after a predetermined time has elapsed,
The electric motor is energized in a tap step-down direction or a step-up direction by a second control signal. In the above-described invention of claim 22, since the control program that can be realized by the computer is stored in the recording medium, the invention of claim 1 and claim 16 can be realized with a simple configuration. .

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) First Embodiment 1-1. Configuration Claims 1-4, 8, 9, 12-14, 16, 17, 19
An embodiment corresponding to the described invention will be described with reference to FIGS. Here, FIG. 1 is a block diagram showing a configuration of the present embodiment, FIG. 2 is a circuit diagram showing a configuration of a drive circuit of the present embodiment, and FIG. 3 shows an internal configuration of control means of the present embodiment. It is a block diagram. That is, the on-load tap switching device 1 according to the present embodiment includes the transformer on-load tap switching device 2 connected to the on-load tap switching transformer 7 and the electric operation control device 3 for driving the same. I have. The electric operation control device 3 includes an electric motor 8, a speed reduction mechanism 9, a no-fuse breaker 15, a drive circuit 21, rotary encoders 22a and 22b, a control means 23, a display means 24, a door switch 28, and the like.

The motor 8 generates power necessary for the operation of the load tap changer 2. The reduction mechanism 9 is a mechanism that reduces the rotation of the electric motor 8 and transmits the rotation to the drive shaft 17 of the on-load tap changer 2. The drive shaft 17 makes one rotation per one tap change. The drive shaft 17 has a first rotary encoder 22a as an angle detecting means.
Is attached. In addition, the drive shaft 1
7 is provided with a shaft (not shown) through which the rotation of the motor 7 is transmitted at a reduced rate at a fixed rate, and a second rotary encoder 22b is attached to this shaft as angle detecting means. First and second rotary encoders 22a, 22
b is an absolute angle detection type (absolute type), and its angle signal directly represents the angle of each axis regardless of the past history. Then, the first and second rotary encoders 22
The angle signal outputs a and 22b are connected to the control means 23.

The drive circuit 21 is a circuit for opening and closing the power supply 16 by a semiconductor element such as a bidirectional thyristor (hereinafter referred to as a triac). One of the circuits is a three-phase AC power supply via the no-fuse breaker 15. One power supply 16 is connected to the other motor 8 which is a three-phase induction motor. As shown in FIG. 2, the drive circuit 21 includes triacs 31a to 31f, phototriacs 32a to 32f, photocouplers 33a to 33f, and the like. The triacs 31a to 31f are elements that directly open and close the power supply. Photo triac 32
The elements a to 32f correspond to the triacs 31a to 31f on a one-to-one basis, and are elements that transmit signals while insulating the power supply circuit from the control signal circuit. Photo couplers 33a to 33f
Is a member that transmits signals while insulating circuits of different control signals.

Then, the first control signal transmission path 25a
Are connected to the light emitting sides of the phototriacs 32a and 32b, and are connected to the light emitting sides of the photocouplers 33a and 33b. Further, the transmission path 25b of the second control signal is connected to the light emitting side of the phototriacs 32c and 32d, and the photocouplers 33c and 3d.
It is connected to the light emitting side of 3d. Further, the transmission path 25c for the third control signal is connected to the phototriacs 32e and 32e.
f and the photocoupler 3
3e and 33f are connected to the light emitting side.

Transmission lines 25 for these first to third control signals
a, 25b, and 25c are paths for transmitting a control signal from the control unit 23. The control unit 23 monitors the angle signals output from the first and second rotary encoders 22a and 22b, and outputs a first control signal, a second control signal, and a third control signal.
Is controlled so as to perform tap switching by controlling the output of the control signal.

This control means 23, as shown in FIG.
It comprises a first microprocessor 41, a second microprocessor 42, a program storage medium 43, a non-volatile storage element 44, a data bus 45, interfaces 46 and 47, and the like. First microprocessor 4
1, second microprocessor 42, program storage medium 43, nonvolatile storage element 44, and interface 4
6, 47 are connected to each other by a data bus 45,
Data exchange is provided.

A program for realizing the operation of the electric operation control device 3 is stored in the program storage medium 43. In particular, with regard to tap switching, the program sends a first or second control signal to the drive circuit 21 when stepping up or stepping down a tap, and when the angle signal reaches a certain angle, the first or second control signal is output. A control method is set in which the second control signal is stopped, and after a certain time has elapsed, the second or first control signal is sent for a certain time.

In accordance with the program, the first microprocessor 41 is set to execute processing relating to tap switching control, and the second microprocessor 42 is set to execute processing relating to display, setting and contact output. The interface 46 is provided so that angle signals from the rotary encoders 22a and 22b and a signal from the door switch 28 can be input. The first to third control signals are provided from the interface 46 to the drive circuit 21 via the transmission lines 25a to 25c so as to be able to output the first to third control signals. Therefore, the first to third control signals are transmitted from the control means 23 to the drive circuit 21 to open and close the corresponding semiconductor elements. The door switch 28 is attached so that the door of the electric operation control device 28 is turned on when the door of the electric operation control device 28 is open, that is, there is a possibility of manual operation.

Further, the display means 24 is connected to the interface 47 and the serial data transmission path 2
The host controller 6 is connected to the host computer via the control unit 7. Therefore,
A tap switching command or the like is provided from the upper control device 6 side, and a state of the on-load tap switching device 1 and an internal state of the electric operation control device 3 are provided from the control means 23 side.

1-2. Action 1-2-1. Operation at Normal Time The tap switching operation at normal time in the present embodiment having the above configuration is as follows. During a period in which tap switching is not being performed, the control unit 23 uses a monitoring unit (not shown) to control the rotary encoders 22a and 22b, the first and second microprocessors 41, 42 and the like.

That is, the transformer 5 detects the amount of voltage change corresponding to the fluctuation of the load 4 of the power transmission and distribution system, and based on the detected voltage change, the upper-level control device 6 causes the on-load tap switching transformer 7 to operate.
When it is determined that the boosting is necessary, the host controller 6 sends a tap boosting command to the control means 23 of the electric operation controller 3 through the serial data transmission path 27.

In the control means 23, the boost command is confirmed by the second microprocessor 42, and this is transmitted to the first microprocessor 41 via the data bus 45. In the first microprocessor 41, (a) the current position of the rotary encoder 22b or the tap position obtained from the tap control history (this data is stored in the nonvolatile storage element 44) is used. Check that the tap position is not at the upper limit. Next, (b) it is confirmed based on the state of the door switch 28 that there is no possibility of manual operation. Further, (c) it is confirmed that the user himself / herself is not performing tap switching.

If all of the above conditions (a) to (c) are satisfied and tap boosting is possible, the first microprocessor 41 outputs a first control signal and outputs a second control signal.
Is notified that the tap is being boosted. In response, the second microprocessor 42
Displays on the display means 24 that tap pressure is being boosted and notifies the host controller 6.

In the drive circuit 21, the input of the first control signal causes the phototriacs 32a, 32a to be driven.
b emits light, and the output sides of the phototriacs 32a and 32b conduct. As a result, the corresponding triacs 31a and 31b become conductive and the power supply 16 is connected to rotate the electric motor 8 in the boosting direction, and the rotation is transmitted to the on-load tap changer 2 through the reduction gear 9 and the drive shaft 17. Then, tap switching is started.

At the same time, the output of the first control signal causes the photocouplers 33a and 33b to emit light and the output sides of the photocouplers 33a and 33b to conduct, so that the transmission paths of the second control signal and the third control signal are transmitted. 25b and 25c are short-circuited. Therefore, the output sides of the phototriacs 32c to 32f are forcibly turned off, and the corresponding triacs 31c to 31f are also turned off, so that a short circuit of the power supply 16 is prevented.

After that, the control means 23 monitors the angle signal output from the rotary encoder 22a attached to the drive shaft 17, and this angle signal outputs a certain angle (before the normal stop angle of the drive shaft). Hereinafter referred to as angle θ)
, The output of the first control signal 25a is stopped. As a result, the triacs 31a and 31b are cut off and the motor 8 is disconnected from the power supply 16, but the motor 8 continues to rotate due to inertia. For this reason,
After a certain period of time (hereinafter referred to as time T1) has elapsed, the control means 23 outputs the second control signal 25b this time.
Output for a fixed time (hereinafter referred to as time T2).

By the input of the second control signal, the phototriacs 32c and 32d of the drive circuit 21 emit light, the corresponding triacs 31c and 31d become conductive, and the power supply 16 rotates the motor 8 in the step-down direction. That is, they are connected so that two phases of the three-phase power supply are switched. As a result, a torque is generated in the electric motor 8 in a direction opposite to the rotation direction, and the electric motor is braked. Second control signal 25
At the time of output of b, the photocouplers 33c and 33d emit light,
Transmission paths 25a, 2 for the first control signal and the third control signal
5c is short-circuited, so that the power supply 16
Is prevented from being short-circuited.

The values of the angle θ and the times T1 and T2 for stopping the drive shaft at the regular stop angle vary depending on the voltage and frequency of the power supply 16, the type of the on-load tap changer 2, and the like. According to experiments, 50 or 6 was used as the power source 16.
0Hz 3-phase 200V power supply, 0.7 as motor 8
When a 5 kW three-phase induction motor is used, the angle θ is in the range of 5 to 30 degrees before the normal stop angle of the drive shaft, the time T1 is in the range of 30 ms to 300 ms, and the time T2 is 30 ms to 7
Good control is possible in the range of 0 ms.

At the time when the output of the second control signal 25b is stopped, the first microprocessor 41 confirms that the angle of the drive shaft 17 is near the normal stop angle and does not change any more. Is notified to the second microprocessor 42. In addition, the first microprocessor 41 calculates the tap position, the required tap switching time, the number of times of tap switching, and the like, records the result in the nonvolatile storage element 44, and sets the calculated required tap switching time within a predetermined range. It confirms that it is settled, and also notifies the second microprocessor 42 of such information. The second microprocessor 42 receives these notifications and information, displays them on the display means 24, and notifies the higher-level control device 6. This completes the normal tap boost operation.

The operation in the case of the tap step-down operation is the same as that described above if the step-up operation is replaced with the step-down operation and the upper limit is replaced with the lower limit, and the roles of the first control signal and the second control signal are exchanged. The same is done.

1-2-2. Next, the operation of this embodiment when various abnormalities occur will be described. First, the anomalies that can occur are:
The drive shaft 17 stops during the tap change and the tap change is not completed, or there is a tap congestion that does not reach the switch angle within a certain time. Such tap congestion occurs due to a mechanical failure of the on-load tap changer 2 or the like. next,
There is a tap runaway in which the drive shaft 17 does not stop even after the tap switching is completed. Such a tap runaway may cause the drive circuit 21
Occurs due to a short-circuit failure or the like of any of the triacs 31a to 31d. Other abnormalities include the rotary encoder 22 of the electric operation control device 3.
a, 22b, the failure of the microprocessors 41, 42,
A power failure caused by a power supply for operating the control device 23 can be cited.

Further, although not necessarily abnormal, a tap switching command exceeding the limit of taps or an unexecutable tap switching command such as a tap switching command at the time of manual operation may be received. In the above case, the electric operation control device 3 operates differently from the normal operation,
This will be described below for each case.

A. Operation in Case of Tap Congestion As described above, after the tap switching operation is started, the control unit 23 monitors the angle of the drive shaft 17 based on the angle signal output from the rotary encoder 22a. When the angle signal stops at the intermediate angle without reaching the angle θ, or when the tap switching required time deviates from the normal range without reaching the angle θ within a certain time without stopping. , The control means 23 determines that tap congestion has occurred.

When the drive shaft 17 stops intermediately and the tap cannot be switched, the control means 23 stops the first and second control signals to stop the motor 8, and at the same time the drive shaft 17 The angle is recorded in the nonvolatile storage element 44.
In addition, although the drive shaft 17 does not stop and the tap switching is not disabled, if the required tap switching time deviates from a predetermined range, the tap position, the required tap switching time, the number of tap switching, and the like are obtained. Recorded in the sex storage element 44. Further, the control unit 23 controls the
An alarm is output to both or one of the display means 24 and the upper control device 6.

B. Operation in the Case of Tap Runaway As described above, immediately after performing control to stop the motor 8, the control unit 23 determines that the angle of the drive shaft 17 is near the normal stop angle and does not change any more. Confirm by the angle signal output from. If the angle signal continues to change beyond the range of the normal stop angle, the control unit 23 determines that a tap runaway has occurred.

In this case, the control means 23 outputs the third control signal 25c to the drive circuit 21 for a certain time. As a result, the triacs 31e and 31f conduct, the power supply 16 is short-circuited in three phases, and a large current flows. Therefore, the no-fuse breaker 15 immediately operates, the power supply 16 is cut off, and the motor 8 stops. Further, the control unit outputs an alarm to one or both of the display unit 24 and the host control device 6.

C. Operation in Case of Rotary Encoder Failure As described above, the control means 23 diagnoses the soundness of the rotary encoders 22a and 22b.
This is performed by comparing the angle signal b with the state of the control signal. If the diagnosis reveals that the rotary encoder 22a has failed, the control means 23 outputs an alarm and the normal rotary encoder 22a.
The tap switching control is continued by the angle signal from b. The angle signal from the rotary encoder 22b is
Since this signal is a signal obtained by decelerating the rotation of No. 7 at a fixed ratio, the angular resolution is inferior to that of 22a, but it is possible to stop the drive shaft 17 within the range of the normal stop angle using this signal.

Further, when the failure of the rotary encoder 22b is found, the control means 23 outputs an alarm and continues the tap switching control based on the angle signal from the normal rotary encoder 22a. In this case, it is impossible to know the current tap position directly, but by obtaining the current tap position from the tap control history, the tap switching control can be continued.

D. Operation in the Case of a Microprocessor Failure As described above, the control means 23 diagnoses the soundness of the first microprocessor 41 and the second microprocessor 42, which is based on a built-in watchdog timer or the like. This is done by means (not shown). Then, when the failure of the first microprocessor 41 is found by this diagnosis, the second microprocessor 42 stops the first microprocessor 41, outputs an alarm, and performs the first microprocessor 41. It performs tap switching control on behalf of and performs processing prior to display or setting-related processing.

(E) Operation in case of power failure Further, the power supply for operating the control device 23 can share the power supply 16 or supply a dedicated power supply separately. And if that power goes out,
When the power is turned on again, the control device 23
The angle signals of 2a and 22b are read, and the angle of the drive shaft and the tap position are reset.

As described above, the rotary encoder 22
The angle signals a and 22b are of the absolute angle detection type and directly represent the drive shaft angle and the tap position. Therefore, even if the drive shaft angle or the tap position changes due to a manual operation during a power failure, they will not be erroneously recognized when the power is turned on again.

(F) Operation When Receiving Unexecutable Tap Switching Command When the on-load tap switching device is inoperable, first, (a) the tap position of the tap switching instruction exceeds the limit. is there. This is determined by the control means 23 based on the angle signal of the rotary encoder 22b. next,
(B) A tap switching instruction may be received during a manual operation. This is determined by the control means 23 based on the state of the door switch 28. Further, there is a case where a tap switching instruction is received while tap switching is currently being executed. this is,
The control means 23 itself makes the determination. If it is determined that the operation cannot be performed, the control unit 23 does not output a control signal related to tap switching, and displays the reason on the display unit 24.

1-3. Effects According to the present embodiment as described above, the drive circuit 21
Uses a circuit composed of the triacs 31a to 31f and the phototriacs 32a to 32f, so that the power supply can be opened and closed at a sufficiently high speed as compared with the rotation speed of the drive shaft, and the variation can be reduced. Therefore, the number of movable parts is reduced, wear and poor contact are reduced, and the angle θ and the time T
1, the variation of T2 is suppressed, and highly accurate tap switching control can be realized. In addition, at least 4 in total for 3 phases
Since the power supply 16 can be opened and closed by each triac,
The configuration of the drive circuit 21 can be simplified.

Further, since the abnormality is displayed using the display means 24 directly connected to the control means 23 instead of the mechanical indicating mechanism, the mechanical mechanism is reduced, the reliability is improved, and the structure is simplified. Then, when tap congestion occurs in which the required time for tap switching deviates from the normal range, the display means 24 is displayed before the event that tap switching cannot be finally performed occurs.
As a result, it is possible to know the existence of the abnormality and take a countermeasure, thereby improving the reliability.

When the tap cannot be switched,
Information such as the history of the tap position and the time required for the tap change until the accident occurs and information for investigating the cause such as the angle at which the tap is stopped are recorded in the non-volatile storage element 44, and this is displayed on the display means 24. Can obtain important information for investigating the cause. Therefore, the operator can immediately understand the reason for the abnormality, and the maintainability and practicality are improved. Further, even when the tap change device under load 1 is inoperable due to reasons such as a tap limit or a manual operation, the display is displayed on the display means 24 so that the operator can immediately understand the reason for the abnormality.

Also, when the tap runs away, the power supply 16 is cut off and the motor 8 is stopped, so that the on-load tap switching transformer 7
No longer continues to be switched to the limit, and the accident can be prevented from spreading. Further, even when one rotary encoder or one microprocessor fails, a situation where tap switching cannot be performed can be avoided, so that reliability is improved. Further, even if an erroneous control signal is output, it is possible to prevent an accident such as a short circuit of the power supply or an intermediate stop of the tap.

The rotary encoders 22a, 22
The angle signal b is an absolute angle detection type and directly represents the drive shaft angle and the tap position. For this reason, even if the drive shaft angle or tap position changes due to manual operation during a power failure, there is no danger that these will be erroneously recognized when the power is turned on again. It can be a device.

Further, a drive circuit 2 using a semiconductor element
1 and a dedicated first microprocessor 41 for tap changeover requiring high-speed control, and performs control to brake the motor when the motor 8 is stopped.
Can always be stably stopped at the regular stop angle.

The first rotary encoder 22a
As a result, a high-resolution angle signal for tap switching control can be obtained, so that precise tap switching control is possible.
Further, since the tap position can be acquired independently by the second rotary encoder 22b, the reliability of the tap position control can be improved by checking the tap position information obtained from the tap control history.

Further, since the contact information and the like are transmitted as serial data to the host controller 6 via the single serial transmission line 27, the amount of wiring between the load tap switching device and the host controller is greatly reduced. (2) Second embodiment 2-1. Configuration Embodiments corresponding to the inventions according to claims 4, 5 and 18 will be described with reference to FIGS. The configuration of this embodiment is different from the first embodiment in that the control method for stopping the electric motor 8 of the electric operation control device 3 in the program readable by the microprocessor stored in the program recording medium 43 is different from that of the first embodiment. different. That is, when the tap is stepped up or stepped down, the first or second control signal is sent to the drive circuit 21 and when the angle signal reaches a certain angle, the first or second control signal is stopped, A control method for sending the third control signal for a certain time after a certain time has elapsed is set. The other points are the same as in the first embodiment.

2-2. Operation The tap switching operation in the present embodiment having the above configuration is as follows. The description of the operation procedure performed in the same manner as in the first embodiment will be omitted. That is,
As in the first embodiment, for example, at the time of tap boosting,
The control means 23 outputs a first control signal. In the drive circuit 21, the triacs 31a, 3a
1b becomes conductive, the electric motor 8 rotates in the boosting direction,
Tap switching is started.

Thereafter, the control means 23 stops the output of the first control signal 25a when the drive shaft reaches a certain angle (hereinafter referred to as angle θ) before the normal stop angle. As a result, the motor 8 is disconnected from the power supply 16, but continues to rotate due to inertia. Therefore, the control means 23
Outputs a third control signal 25c for a certain period of time after a certain period of time has elapsed.

Then, by the input of the third control signal,
Phototriacs 32e and 32f of drive circuit 21
Is emitted, and the corresponding triacs 31e and 31f are turned on, and the phases of the electric motor 8 are short-circuited for a certain time. The energy of the rotational motion due to inertia is consumed by this short circuit, so that the electric motor 8 can be braked and the stop position of the tap can be controlled with high accuracy. Third
When the control signal is output, the photocouplers 33e and 33f
Emits light, the transmission lines 25a and 25b for the first control signal and the second control signal are short-circuited, and the triacs 31a to 31a
Since all the switches d are in the cutoff state, the short circuit of the power supply 16 is prevented.

The operation in the case of tap step-down is performed in the same manner as described above except that the step-up in the above description of operation is replaced with step-down and the roles of the first control signal and the second control signal are switched.

2-3. Effects According to the present embodiment as described above, when the motor 8 is stopped, the phase of the motor is short-circuited for a fixed time to perform the control of braking the motor 8, so that the drive shaft 17 is always stably maintained at the normal stop angle. Can be stopped. Also, during the output of the third control signal,
Even when the first or second control signal is output, it is possible to prevent an accident such as a short circuit of the power supply.

(3) Third Embodiment 3-1. Configuration An embodiment corresponding to the inventions of claims 6, 7 and 21 will be described with reference to FIG. In FIG. 4,
Portions already described in the related art and the first embodiment are denoted by the same reference numerals, and description thereof is omitted. That is, one rotary encoder 22c is attached to the drive shaft 17 as angle detection means. The rotary encoder 22c is configured to output the rotation speed of the drive shaft 17 in addition to the angle of the drive shaft 17. The angle signal output side of the rotary encoder 22c is connected to the control means 23.

3-2. Operation The tap switching operation in the present embodiment having the above configuration is as follows. That is, the control means 23
The drive shaft 17 is controlled with high accuracy by the high-resolution angle signal output from the rotary encoder 22c. At the same time, the current tap position is grasped by collating the tap position obtained from the rotation speed signal output from the rotary encoder 22c with the tap position obtained from the tap control history, and the current tap position is used for tap control. Is always recorded in the nonvolatile storage element 44.

When the control power supply is interrupted, the rotational speed signal output from the rotary encoder 22c is initialized, and the current tap position of the on-load tap change transformer 7 becomes unknown. At this time, the tap position recorded in the nonvolatile memory element 44 is set as the current tap position.

3-3. Effects According to the present embodiment as described above, accurate tap switching control can be performed with only one rotary encoder 22c, and tap positions are obtained and collated in two ways. For this reason, the reliability of the tap position control can be improved while simplifying the configuration of the electric operation control device.

Even if a power failure occurs, the current tap position is automatically read from the nonvolatile memory element 44 immediately after the power is turned on, unless the drive shaft angle and the tap position are changed by manual operation during the power failure. Set to. For this reason, manual resetting is not required if manual operation is not performed,
Reliability and practicality can be improved.

(4) Fourth Embodiment 4-1. Configuration An embodiment corresponding to the invention described in claims 10 and 11 will be described with reference to FIG. In FIG. 5, the same reference numerals are given to portions already described in the related art and the first embodiment, and description thereof will be omitted. That is, the door switch 28 indicating the possibility that the on-load tap switching device 1 is being manually operated is connected to the control means 23 and the first control signal line 25a of the drive circuit 21 is connected.
And the second control signal line 25b.

The drive shaft 17 is connected to a limit detection mechanism 29 that mechanically detects that the tap position is at the limit by a cam mechanism or the like. The limit detection mechanism 29 includes:
A switch 29a that is turned on when the tap is at the upper limit and a switch 29b that is turned on when the tap is at the lower limit are provided. The switch 29a is connected to the first control signal line 25a, and the switch 29b is connected to the first control signal line 25b.

4-2. Operation The operation in the present embodiment having the above configuration is as follows. That is, the door switch 28 is turned on during the manual operation. In this case, the control means 23 is programmed to stop sending the first and second control signals. In the drive circuit 21, the first
Control signal 25a and the second control signal 25b are short-circuited, so that the triac 31a corresponding to the control signal
To 31d are forcibly turned off.

When the tap position is at the limit, the switch 29a or the switch 29b of the limit detection mechanism 29
Turns on. In this case, the control means 23 is programmed to stop sending the first control signal or the second control signal. Further, in the drive circuit 21, the transmission path 25a for the first control signal or the transmission path 25b for the second control signal is short-circuited, so that the semiconductor element corresponding to the control signal is turned off. Therefore, in the above case, even if the first control signal or the second control signal
Is output from the control means 23, the motor 8
Is not energized.

4-3. Effects According to the present embodiment as described above, even if the control unit 21 malfunctions during the manual operation, it is possible to prevent an accident in which the electric motor rotates. Further, even if the first or second control signal exceeding the tap position limit is output due to a malfunction of the control means 21 or the like, the motor 8 does not rotate and the damage of the load tap changer 2 is prevented. And reliability can be improved.

(5) Fifth Embodiment 5-1. Configuration An embodiment corresponding to the invention described in claims 12, 15 and 20 will be described with reference to FIG. In FIG. 6, the same reference numerals are given to the parts already described in the related art and the first embodiment, and the description will be omitted.
That is, as shown in FIG.
1b is a means for monitoring the internal state of the electric operation control device 3, and monitors the voltage applied to the electric motor 8. The light emitting sides of the photocouplers 51a and 51b are connected so that the inter-phase voltage of the side connected to the electric motor 8 in the drive circuit 21 is applied, and the light receiving side is connected to the signal lines 53a and 5b.
3b is connected to the control means 23.

The photocouplers 52a and 52b are one means for measuring the voltage of the power supply 16. The light emitting side of the photocouplers 52a and 52b
The power supply 16 is connected so that the power supply interphase voltage on the side connected to the power supply 16 is applied, and the light receiving side is connected to the control means 23 by signal lines 54a and 54b. In order to accurately measure the voltage, it is desirable to use analog photocouplers as the photocouplers 52a and 52b.

5-2. Operation The tap switching operation in the present embodiment having the above configuration is as follows. That is, when a certain voltage or more is applied to the electric motor 8, the photocouplers 51a and 51b
Is turned on, and a current flows through the signal lines 53a and 53b to notify the control means 23. The first control signal and the second
If the light receiving side of the photocoupler 51a or the photocoupler 51b becomes conductive despite not outputting any of the control signals of
a to 31d are determined to have caused a short-circuit fault,
An alarm is displayed on the display means 24.

Further, despite the output of the third control signal, the photocoupler 51a or the photocoupler 51
If the light receiving side of b does not conduct, the control means 23 determines that the triac 31e or 31f has a disconnection failure, and displays an alarm on the display means 24.

On the other hand, the amount of light emission on the light emitting side of the photocouplers 52a and 52b changes according to the instantaneous voltage of the power supply 16, and the current flowing on the light receiving side, that is, the signal lines 54a and 54b changes correspondingly. The control means 23 measures the voltage of the power supply 16 according to the maximum value of the current, and measures the frequency of the power supply 16 according to the time from the zero point of the current to the next zero point. Further, the control means 23 automatically refers to a programmed numerical table obtained by an experiment based on the measured result of the measured voltage or frequency, and automatically sets the angle relating to the start or stop of the first to third control signals. Or change the setting so that the time value is optimal.

5-3. Effect As described above, according to the present embodiment, since the internal state of the electric operation control device 3 such as the state of the triacs 31a to 31f is monitored, the abnormality is detected before an accident such as a tap intermediate stop occurs. There is a possibility that it is possible to contribute to improvement of reliability.

The alarm display is provided by a display means 24 directly connected to the control means 23 instead of a mechanical indicating mechanism.
Therefore, the number of mechanical mechanisms is reduced, the reliability is improved, and the configuration is simplified.

Further, the value of the optimum angle or the optimum time for starting or stopping the first to third control signals is stored in the power supply 16.
Can be easily changed to suit the type of power supply, so that it can be easily applied to substation equipment under various conditions, and the practicality can be improved. In addition, the power supply voltage and power supply frequency of the power supply 16 fluctuate during operation. However, it is possible to realize good tap switching control that is not easily affected by the above.

(6) Sixth Embodiment 6-1. Configuration An embodiment corresponding to the invention described in claim 13 will be described with reference to FIG. In the figure, the parts already described in the prior art or the first embodiment are:
The same reference numerals are given and the description is omitted.

In FIG. 7, the control means 23 is a state corresponding to one item to be notified for notifying the state of the load tap changer 2 or the internal state of the electric operation control device 3 to the host control device 6. It is configured to hold point contact information. The contact information is converted into serial data by the second microprocessor 42 and transmitted via the serial data transmission line 27 to the contact amplifying means 55 near the host controller 6. The contact amplifying means 55 is configured to output the number of contacts required by the host controller 6 through the parallel signal line 57. The conversion into serial data may be performed by a communication LSI or the like.

6-2. Operation The operation of the present embodiment having the above configuration is as follows. That is, a large number of contact information indicating the internal state of the device, such as the state of the load tap changer 2 such as the tap position and the operating state, and the soundness of the drive circuit 21, or a plurality of contacts having the same information is required. Even in such a case, the contact information can be converted into serial data and transmitted via a single serial data transmission line 27.

6-3. Effects According to the present invention as described above, the tap switching device under load 1
It is possible to greatly reduce the amount of wiring between the power supply and the upper control device 6, and to simplify the substation equipment.

(7) Other Embodiments The present invention is not limited to the above-described embodiments, and the following embodiments can be configured. For example, an embodiment in which the insulation level of a signal line is reduced will be described with reference to FIG. In the figure, portions already described in the related art or the first embodiment are denoted by the same reference numerals, and description thereof is omitted. That is, in FIG. 8, the control unit 23 notifies the host controller 6 of the state of the on-load tap changer 2 or the internal state of the electric operation control device 3. Is configured to hold the contact information. The contact information is provided as a parallel voltage signal of 60 V or less through a pair of parallel signal lines 56 per point, and is provided as contact voltage amplification means 5 arranged near the host controller 6.
5 is transmitted. The contact amplifying means 55 is configured to amplify the number of contacts required by the host controller 6 and output the amplified contacts via the parallel signal line 57.

In the embodiment described above, the contact information indicating the state of the on-load tap changer 1 such as the tap position and the operating state, or the internal state of the electric operation control device 3 such as the soundness of the drive circuit 21 is 60 V. Since the following parallel voltage signal is transmitted to the host controller 6, the insulation level of the parallel signal lines 56 and 57 can be reduced. Therefore, a thin signal line can be applied as the parallel signal lines 56 and 57, and simplification of the substation equipment can be achieved. This is particularly advantageous in the case where the electric operation control device 3 and the host control device 6 are close to each other, and the parallel signal lines 56 and 57 are configured to be hardly affected by electromagnetic noise. Note that a recording medium on which the control procedure described in each of the above embodiments is recorded can also be configured.

[0111]

According to the present invention as described above, the number of movable parts is small, and the occurrence of wear and poor contact can be reduced.
Provided is an on-load tap switching device which is highly reliable in consideration of the characteristics of electrical and electronic elements, can operate stably with a simplified configuration, a control method thereof, and a recording medium on which a control program is recorded. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing first and second embodiments of an on-load tap switching device according to the present invention.

FIG. 2 is a circuit diagram showing a configuration of a drive circuit of the on-load tap switching device according to the present invention.

FIG. 3 is a block diagram showing an internal configuration of control means of the on-load tap switching device according to the present invention.

FIG. 4 is a block diagram showing a third embodiment of the on-load tap switching device according to the present invention.

FIG. 5 is a block diagram showing a fourth embodiment of the on-load tap switching device according to the present invention.

FIG. 6 is a block diagram showing a fifth embodiment of the on-load tap switching device according to the present invention.

FIG. 7 is a block diagram showing a sixth embodiment of the on-load tap switching device according to the present invention.

FIG. 8 is a block diagram showing another embodiment of the on-load tap switching device according to the present invention.

FIG. 9 is a block diagram showing a form of a conventional on-load tap switching device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tap change device at load 2 ... Tap changer at load 3 ... Electric operation control device 4 ... Load 5 ... Transformer 6 ... Host control device 7 ... Transformer at load change at tap 8 ... Motor 9 ... Reduction mechanism 15 ... No Fuse breaker 16 Power supply 17 Drive shaft 21 Drive circuit 22a, 22b Rotary encoder 23 Control means 24 Display means 25a to 25c First to third control signal transmission paths 27 Serial data transmission paths 28 Door switch

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shiro Maruyama 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term in the Toshiba Hamakawasaki Plant 5G066 DA01

Claims (22)

[Claims] An on-load tap changer, an electric motor for rotating a drive shaft of the on-load tap changer, a drive circuit for opening and closing a power supply to the electric motor, and an angle for detecting a rotation angle of the drive shaft A load tap switching device comprising: a detection unit; and a control unit configured to control the drive circuit with a plurality of control signals based on an angle signal from the angle detection unit. A combination of one of the plurality of semiconductor elements is brought into a conductive state by a first control signal among the control signals from the control means, and the tap is applied to the motor in a step-up direction or a step-down direction. Another one combination of the plurality of semiconductor elements is configured to be capable of energizing, and a second control signal of the control signals from the control unit is provided. A load tap switching device, which is configured to be in a conductive state by a signal, and to be capable of energizing the motor in a tap step-down direction or a step-up direction. 2. The on-load tap switching device according to claim 1, wherein said semiconductor element is a bidirectional thyristor. 3. The drive circuit according to claim 2, wherein the semiconductor element, which is turned on by the second control signal, is cut off by the input of the first control signal, irrespective of the state of the second control signal. The semiconductor device which is turned on by the input of the second control signal is turned off irrespective of the state of the first control signal. 3. The tap change device under load according to claim 1 or 2, wherein 4. At least one of the combinations of the plurality of semiconductor elements is turned on by a third control signal among the control signals from the control means, so that a short circuit between the phases of the electric motor can be performed. The on-load tap switching device according to claim 1, wherein the on-load tap switching device is configured. 5. The drive circuit according to claim 3, wherein the semiconductor element that is turned on by the first and second control signals in response to the input of the third control signal changes a state of the first and second control signals. The on-load tap switching device according to any one of claims 1 to 4, wherein the on-load tap switching device is configured to be in a cutoff state irrespective of the state. 6. The apparatus according to claim 1, wherein said angle detecting means has a first rotary encoder which outputs, as an angle signal, an angle of a drive shaft which makes one rotation per tap change. 2. The tap change device under load according to claim 1. 7. The on-load tap switching device according to claim 6, wherein the first rotary encoder is provided so as to be able to detect the number of revolutions of the drive shaft. 8. The apparatus according to claim 6, wherein said angle detecting means has a second rotary encoder which outputs, as an angle signal, an angle of the axis at which the drive shaft is decelerated at a predetermined ratio. Under load tap changer. 9. The system according to claim 8, wherein said first and second rotary encoders are of an absolute angle detection type.
An on-load tap switching device as described. 10. A manual state detecting means for detecting that the on-load tap switching device is being manually operated is connected to the drive circuit and the control means, and the control means is manually operated by the manual state detecting means. While the inside is detected, the control circuit is configured to stop transmitting the control signal. The drive circuit is configured such that the semiconductor element that is brought into a conductive state by the first and second control signals is controlled by the manual state detection unit. While the manual operation is being detected, the first
10. The on-load tap switching according to any one of claims 1 to 9, wherein the motor is in a cut-off state irrespective of the state of the second control signal and the motor cannot be energized. apparatus. 11. Limit detection means for detecting that a tap position is at an upper limit and a lower limit is connected to the drive circuit and the control means, and the control means controls the tap position to be at an upper limit or a lower limit by the limit detection means. While it is detected,
The drive circuit is configured to stop transmitting a control signal, and the drive circuit shuts off a semiconductor element that is turned on by the first and second control signals irrespective of a state of the first and second control signals. 11. The electric motor is configured to be in a state, and the motor cannot be energized in the tap step-up or step-down direction.
The on-load tap switching device according to any one of the preceding claims. 12. The on-load tap switching device according to claim 1, wherein display means for displaying information relating to tap switching abnormality is connected to said control means. 13. The control unit according to claim 1, further comprising a data conversion unit configured to convert information indicating a state inside the on-load tap switching device into serial data. 2. The tap change device under load according to claim 1. 14. The apparatus according to claim 1, wherein said control means has at least one microprocessor for processing tap switching control and at least one microprocessor for processing other than tap switching control. The on-load tap switching device according to any one of the preceding claims. 15. A power supply system comprising: a measuring unit for measuring a power supply voltage or a power supply frequency of the electric motor; and a changing unit for changing a set value related to the control signal based on a measurement result by the measuring unit. Item 15. The on-load tap switching device according to any one of Items 1 to 14. 16. A control unit outputs at least one of a plurality of control signals to a drive circuit based on a rotation angle of a drive shaft of the on-load tap changer, and the drive circuit based on the control signal. However, in the control method of the on-load tap switching device that opens and closes the power supplied to the electric motor that rotates the drive shaft, the control unit outputs a first control signal of the control signals to the drive circuit. A step of energizing the electric motor in a tap step-up or step-down direction; a step of stopping the first control signal when the rotation angle reaches a predetermined angle; and after a predetermined time elapses. And outputting a second control signal of the control signals to the drive circuit for a predetermined time, thereby energizing the motor in a tap step-down direction or a step-up direction. Method of controlling load tap switching device which comprises the steps that, the. 17. The method according to claim 17, wherein the predetermined angle is 5 degrees to 30 degrees before a normal stop angle of the drive shaft, and the second control is performed after a lapse of 30 ms to 300 ms from the stop of the first control signal. The signal is output for a time of 30 ms to 70 ms.
A control method of the on-load tap switching device according to the above. 18. A control circuit outputs at least one of a plurality of control signals to a drive circuit based on a rotation angle of a drive shaft of the on-load tap changer, and based on the control signal, controls the drive circuit. However, in the control method of the on-load tap switching device that opens and closes the power supplied to the electric motor that rotates the drive shaft, the control unit outputs a first control signal of the control signals to the drive circuit. A step of energizing the electric motor in a tap step-up or step-down direction; a step of stopping the first control signal when the rotation angle reaches a predetermined angle; and after a predetermined time elapses. Outputting a third control signal of the control signals for a predetermined time to short-circuit the phases of the electric motor. Control method of-flops switching device. 19. The method according to claim 18, wherein the third control signal is output for a predetermined time when the drive shaft does not stop. 20. The on-load tap switching device according to claim 16, wherein a set value relating to the control signal is changed according to a power supply voltage or a power supply frequency for the electric motor. Control method. 21. The control device according to claim 1, wherein the control unit calculates a tap position based on the angle signal or a history of tap control when the tap is stepped up or down, and records the tap position obtained by the control unit in a nonvolatile storage unit. 21. The on-load tap switching apparatus according to claim 16, wherein the tap position recorded in the storage unit is regarded as a current tap position when the power is turned on again thereafter. Control method. 22. A recording recording a control program of a load tap switching device for opening and closing a power supply of an electric motor rotating the drive shaft using a computer based on a rotation angle of a drive shaft of the load tap changer. In the medium, the program causes the computer to energize the electric motor in a tap step-up or step-down direction by a first control signal, and stops the first control signal when the rotation angle reaches a predetermined angle. A recording medium in which a control program for a load tap switching device is recorded, wherein the motor is energized in a tap step-down or step-up direction by a second control signal after a predetermined time has elapsed.