JP2018160495A - Tap switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the life of a tap switching device using a mechanical relay is short, and the tap switching device is vulnerable to vibration and mechanical shock.SOLUTION: The tap switching device comprises: a motor 11 for tap switching that rotates in a first direction when AC power is supplied to a first terminal and rotates in a second direction when the power is supplied to a second terminal; a rectification circuit 14 for outputting a first command signal when rotating the motor 11 in the first direction; a rectification circuit 15 for outputting a second command signal when rotating the motor 11 in the second direction; a switching circuit 12, constituted using a semiconductor element, for controlling the supply of single-phase AC power to the first terminal in accordance with the first command signal; and a switching circuit 13, constituted using a semiconductor element, for controlling the supply of single-phase AC power to the second terminal in accordance with the second command signal. Due to the fact that the switching circuits 12, 13 are constituted by a semiconductor element, it is possible to extend the life longer than for the case where a mechanical relay is used, and intensity resistance to vibration and mechanical shock.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tap switching device that switches an energizing tap of a regulating transformer used in an automatic voltage regulator.

  2. Description of the Related Art Conventionally, in a distribution system, an automatic voltage regulator (SVR: Step Voltage Regulator) for distribution is installed in order to keep the voltage of the system in a set range. The automatic voltage regulator automatically adjusts the voltage by, for example, switching the energizing tap of the adjustment transformer according to the secondary side voltage (see, for example, Patent Document 1).

  In the automatic voltage regulator, switching of the energizing tap of the adjustment transformer is performed by a tap switching device. FIG. 5 is a diagram illustrating an example of a conventional tap switching device 100. The tap switching device 100 includes a single-phase reversible motor 123, a switch, a relay, a relay switch operated by a relay, and the like. The single-phase reversible motor 123 includes a capacitor 123a and windings 123b and 123c.

  The operation of the tap switching device 100 will be described with reference to FIG. When automatically controlling the tap switching device 100, the switch 103 is turned on. When the single-phase reversible motor 123 is rotated in the first direction, the switch 111 is temporarily turned on in response to a command from the CPU or the like. Then, the single-phase AC power supply 101 is supplied to the relay 115 via the b-contact relay switch 113 (88L). In this way, when the current flows through the relay 115, the relay switches 119 (88R), 121 (88R), and 129 (88R) of the a contact are closed, and the relay switch 112 (88R) of the b contact is opened. As a result, supply of power to the relay 114 is blocked, and power can be prevented from being supplied to both terminals of the single-phase reversible motor 123. Further, when the relay switch 121 (88R) is closed, the single-phase reversible motor 123 rotates in the first direction. The switch 127 that is turned on only during the one-tap rotation period of the single-phase reversible motor 123 is closed according to the rotation of the single-phase reversible motor 123 in the first direction, and a current flows through the relay 130. As a result, the relay switch 120 (22) is closed, and a current flows through the relay 115 via the relay switch 120 (22) and the relay switch 119 (88R), and the supply of current to the relay 88R is maintained. Will be. Thereafter, the switch 111 may be opened. When the rotation for one tap of the single-phase reversible motor 123 is completed, the switch 127 is opened, and accordingly, no current flows through the relay 130, and the relay switch 120 (22) is opened. As a result, no current is supplied to the relay 115 and the relay switch 121 (88R) is opened, whereby the rotation of the single-phase reversible motor 123 in the first direction stops. When the single-phase reversible motor 123 is rotated in the second direction, the switch 110 is temporarily turned on, so that the single-phase reversible motor 123 is rotated in the second direction by one tap. It will be. However, when a current flows through the relay 114, a relay switch including (88L) in the code operates.

  When the tap switching device 100 is manually controlled, the switch 103 is opened. When the single-phase reversible motor 123 is rotated in the boosting direction, the boosting switch 105 is manually turned on temporarily. Then, current is supplied to the relay 115 via the relay switches 108 (67X) and 113 (88L) of the b contact, and the single-phase reversible motor 123 rotates in the first direction in the same manner as described above. In the case of forward power transmission in the automatic voltage regulator, it is assumed that the rotation in the first direction is the rotation in the boosting direction on the secondary side. Further, when the power transmission direction of the automatic voltage regulator is reverse power transmission, the switch 125 is turned on. Then, a current flows through the relay 126, the relay switches 107 (67X) and 109 (67X) of the a contact are closed, and the relay switches 106 (67X) and 108 (67X) of the b contact are opened. As a result, the rotation direction of the single-phase reversible motor 123 is reversed when the step-down switch 104 or the step-up switch 105 is operated.

  When the single-phase reversible motor 123 rotating in the first direction rotates beyond the terminal tap, the rotation is stopped by opening the limit switch 117 of the b contact. Conversely, when the single-phase reversible motor 123 rotating in the second direction rotates beyond the terminal tap, the rotation is stopped by opening the limit switch 116 of the b contact.

JP 2001-190025 A

  In the tap switching device 100 shown in FIG. 5, a mechanical relay is used to control the single-phase reversible motor 123. The mechanical relay has a life because the contact wears every time the switch is opened and closed. Furthermore, in recent years, the frequency of voltage adjustment in an automatic voltage regulator tends to increase according to reverse power flow from a distributed power source such as solar power generation. Therefore, there is a problem that the life of the tap switching device 100 becomes shorter. Furthermore, when a mechanical relay is used, there is also a problem that it is vulnerable to vibration and impact.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a tap switching device that has a longer life and is resistant to vibration and impact.

In order to achieve the above object, a tap switching device according to the present invention is a motor that switches an energizing tap of a regulating transformer used in an automatic voltage regulator, has first and second terminals, and a single-phase AC power source is a first-phase AC power source. A single-phase reversible motor that rotates in the first direction when supplied to one terminal and rotates in the second direction when a single-phase AC power supply is supplied to the second terminal; A circuit that rectifies an AC signal, and outputs a first instruction signal when the single-phase reversible motor is rotated in the first direction, and rectifies the AC signal from the single-phase AC power source. A second rectifier circuit that is a circuit that outputs a second instruction signal when the single-phase reversible motor is rotated in the second direction, and a single-phase AC power supply to the first terminal in response to the first instruction signal This is a circuit that controls the supply of A first open / close circuit that is a circuit and a circuit that controls the supply of single-phase AC power to the second terminal in response to the second instruction signal, and is a second open / close circuit that is configured using a semiconductor element And a circuit.
With such a configuration, the first and second open / close circuits can be constituted by semiconductor elements, so that the life can be extended as compared with the case of using a mechanical relay, and resistance to vibration and impact is enhanced.

In the tap switching device according to the present invention, the first switching circuit includes a first triac disposed between the single-phase AC power source and the first terminal, a first light emitting element that emits light in response to the first instruction signal, A first phototriac that supplies an AC signal from the single-phase AC power source to the gate of the first triac when receiving light from the one light emitting element, and the second switching circuit includes the single-phase AC power source and the first When receiving light from the second triac disposed between the two terminals, the second light emitting element that emits light according to the second instruction signal, and the light from the second light emitting element, the AC signal from the single-phase AC power supply is And a second phototriac that is supplied to a gate of two triacs.
With such a configuration, it is possible to realize the first and second open / close circuits capable of controlling the high-current alternating current used for driving the single-phase reversible motor.

In the tap switching device according to the present invention, each of the first and second rectifier circuits includes first and second constant current diodes, and the first instruction signal is transmitted through the first constant current diode. The second instruction signal may be output from the second rectifier circuit via the second constant current diode.
With such a configuration, the first and second instruction signals output from the first and second rectifier circuits can be set to predetermined currents. As a result, light emission of the light emitting element can be stabilized in the semiconductor relay or the like to which the first and second instruction signals are input, and the semiconductor relay or the like can be appropriately operated.

Further, in the tap switching device according to the present invention, when the single-phase reversible motor is rotated in the first direction by automatic control, a semiconductor relay that temporarily supplies an AC signal of the single-phase AC power supply to the first rectifier circuit, and an automatic When the single-phase reversible motor is rotated in the second direction by control, the single-phase reversible motor is connected to the semiconductor relay that temporarily supplies the AC signal of the single-phase AC power supply to the second rectifier circuit and the single-phase AC power supply. A switch that is turned on at the time of rotation, a semiconductor relay that is connected to the switch and supplies an AC signal from a single-phase AC power source supplied through the switch to the first rectifier circuit in response to the first instruction signal, and a switch And a semiconductor relay for supplying an AC signal from a single-phase AC power source supplied via a switch to the second rectifier circuit in response to the second instruction signal, and each semiconductor relay in parallel. A location has been varistor, may further comprise a.
With such a configuration, even when an overvoltage occurs, the possibility that the semiconductor relay is destroyed by the varistor arranged in parallel with the semiconductor relay can be reduced.

In the tap switching device according to the present invention, when forward transmission is performed in the automatic voltage regulator, the rotations in the first and second directions of the single-phase reversible motor are rotations on the boost side and the buck side, respectively. When rotating a single-phase reversible motor to the boost side by using a boost switch that temporarily supplies the AC signal of the single-phase AC power supply and when rotating the single-phase reversible motor to the step-down side by manual control, A step-down switch that temporarily supplies an AC signal of the power source, and a b-contact semiconductor relay that is disposed between the step-up switch and the first rectifier circuit and operates in accordance with a first reverse power transmission signal input during reverse power transmission And a b-contact semiconductor relay disposed between the step-down switch and the second rectifier circuit and operating in response to the first reverse power transmission signal, and disposed between the boost switch and the second rectifier circuit for reverse power transmission. Entered in An a-contact semiconductor relay that operates in response to a second reverse power transmission signal; an a-contact semiconductor relay that is disposed between the step-down switch and the first rectifier circuit and operates in response to a second reverse power transmission signal; and an automatic voltage regulator And a signal output unit that outputs first and second reverse power transmission signals when the power transmission direction is reverse power transmission, and the signal output unit simultaneously closes both the a-contact semiconductor relay and the b-contact semiconductor relay. You may output a 1st and 2nd reverse power transmission signal so that there may be no period.
With such a configuration, the operation timings of the a-contact semiconductor relay and the b-contact semiconductor relay may be different, but it is possible to avoid that both semiconductor relays are closed at the same time, and as a result, a single-phase reversible motor Can be prevented from breaking down. In addition, by adopting the above configuration, for example, even if an AC / DC converter that converts AC power from a single-phase AC power source into DC power fails, the tap switching device can be operated manually. Become.

Further, in the tap switching device according to the present invention, the signal output unit outputs the first reverse power transmission signal first when the forward power transmission is switched to the reverse power transmission, and then outputs the second reverse power transmission signal. When the forward transmission is started, the output of the second reverse power transmission signal may be stopped first, and then the output of the first reverse power transmission signal may be stopped.
With such a configuration, the a-contact semiconductor relay and the b-contact semiconductor relay are prevented from being closed at the same time regardless of which operation timing of the a-contact semiconductor relay or the b-contact semiconductor relay is earlier. Can do.

  According to the tap switching device of the present invention, at least a part of the configuration is configured by a semiconductor element, so that the lifetime can be extended as compared with the case where a mechanical relay is used, and resistance to vibration and impact is enhanced.

The circuit diagram which shows the circuit structure of the tap switching device by embodiment of this invention The circuit diagram which shows the circuit structure of the 3rd switching circuit in the embodiment The circuit diagram which shows the circuit structure of the 4th switching circuit in the embodiment The figure which shows an example of the 1st and 2nd reverse power transmission signal etc. in the embodiment Circuit diagram showing the configuration of a conventional tap switching device

  Hereinafter, a tap switching device according to the present invention will be described using embodiments. Note that, in the following embodiments, the components given the same reference numerals are the same or equivalent, and repetitive description may be omitted. The tap switching device according to the present embodiment controls a motor that switches energization taps using a semiconductor element without using a mechanical relay.

  FIG. 1 is a circuit diagram showing a circuit configuration of a tap switching device 1 according to the present embodiment. The tap switching device 1 according to the present embodiment switches an energizing tap of an adjustment transformer (not shown) used in an automatic voltage regulator (SVR) for power distribution, and includes a single-phase reversible motor 11 and a first Open / close circuit 12, second open / close circuit 13, first rectifier circuit 14, second rectifier circuit 15, switches 16, 17, 19, third open / close circuit 18, step-up switch 20, step-down switch 21, , A fourth switching circuit 22, semiconductor relays 31 to 34, and limit switches 35 and 36. Note that the tap switching device 1 may switch, for example, an SVR energization tap used in a three-phase distribution line. The single-phase AC power supply 10 may be, for example, one in which a certain phase AC voltage (for example, about 6600 V) is stepped down to about 110 V among the three-phase distribution lines.

  The single-phase reversible motor 11 is a motor that switches an energization tap of the adjustment transformer of the SVR, and is a capacitor motor that includes a capacitor 11a and windings 11b and 11c. The single-phase reversible motor 11 includes a first terminal 11d and a second terminal 11e. When the single-phase AC power supply 10 is supplied to the first terminal 11d, that is, the single-phase AC power supply 10 is connected to the winding 11b. When the alternating-current power is supplied, and when the alternating-current power whose phase is changed by the capacitor 11a is supplied to the winding 11c, it rotates in the first direction, and the single-phase alternating current power supply 10 is supplied to the second terminal 11e. That is, the motor rotates in the second direction when AC power from the single-phase AC power source 10 is supplied to the winding 11c and AC power whose phase is changed by the capacitor 11a is supplied to the winding 11b. For example, the rotation of the single-phase reversible motor 11 in the first direction may be considered to be forward rotation, and the rotation in the second direction may be considered to be reverse rotation, or vice versa. Further, whether the voltage to be controlled is stepped up or stepped down in the SVR when the single-phase reversible motor 11 rotates in the first direction depends on the power transmission direction. In the case of forward power transmission, description will be made assuming that the rotation in the first direction of the single-phase reversible motor 11 is rotation on the boost side on the secondary side and the rotation in the second direction is rotation on the step-down side on the secondary side. Therefore, in the present embodiment, when reverse power transmission is performed in the SVR, the rotation in the second direction of the single-phase reversible motor 11 becomes the rotation on the boost side on the primary side, and the rotation in the first direction becomes the step-down side on the primary side. It becomes the rotation. The single-phase reversible motor 11 may have a configuration other than that shown in FIG. 1 as long as the same operation is performed in response to the supply of the single-phase AC power.

  The first open / close circuit 12 is a circuit that controls the supply of the single-phase AC power supply 10 to the first terminal 11d in response to a first instruction signal described later, and is a circuit configured using a semiconductor element. The first opening / closing circuit 12 includes a first triac 12a, a first light emitting element 12b, a first phototriac 12c, and a first current limiting resistor 12d.

  The first triac 12a is a triac disposed between the single-phase AC power supply 10 and the first terminal 11d. For example, a snubber circuit having a resistor and a capacitor may be provided in the first triac 12a as a high-voltage absorption protection circuit. The first light emitting element 12b emits light in response to the first instruction signal output from the first rectifier circuit 14. The first light emitting element 12b may be, for example, an LED (Light Emitting Diode). The first phototriac 12c is a phototriac disposed between the single-phase AC power source 10 and the gate of the first triac 12a, and receives the light from the first light emitting element 12b, and receives the single-phase AC power source 10b. Is supplied to the gate of the first triac 12a. The wiring length from the first phototriac 12c to the gate of the first triac 12a is preferably short. The wiring length may be, for example, 15 cm or less. The first current limiting resistor 12d is a resistor for limiting the current input to the first phototriac 12c. In the first opening / closing circuit 12, when a first instruction signal is input, the first light emitting element 12b emits light, an alternating current signal flows through the first phototriac 12c, and the alternating current signal is supplied to the gate of the first triac 12a. As a result, the first triac 12 a is turned on, and the single-phase AC power supply 10 is supplied to the first terminal 11 d of the single-phase reversible motor 11. On the other hand, when the first instruction signal is not input, the first light emitting element 12b stops emitting light, and the supply of the AC signal from the first phototriac 12c to the gate of the first triac 12a stops, so that the first triac 12a When turned off, the single-phase AC power supply 10 is not supplied to the first terminal 11d. By using a triac as a switch for controlling the supply of the single-phase AC power supply 10, a large current can be controlled as compared with a semiconductor relay such as a photo MOS relay. Since the first current limiting resistor 12d is provided to protect the first phototriac 12c from surge current, for example, when the first phototriac 12c can be protected from surge current by other methods. The first switching circuit 12 may not have the first current limiting resistor 12d. The first open / close circuit 12 includes varistors (not shown) arranged in parallel with the first triac 12a and the first phototriac 12c in order to protect the first triac 12a and the first phototriac 12c from overvoltage. You may have.

  The second opening / closing circuit 13 is a circuit that controls the supply of the single-phase AC power supply 10 to the second terminal 11e in response to a second instruction signal described later, and is a circuit configured using a semiconductor element. The second open / close circuit 13 includes a second triac 13a, a second light emitting element 13b, a second phototriac 13c, and a second current limiting resistor 13d.

  The second triac 13a is a triac disposed between the single-phase AC power supply 10 and the second terminal 11e. The second light emitting element 13b emits light by the second instruction signal output from the second rectifier circuit 15. The second phototriac 13c is a phototriac disposed between the single-phase AC power supply 10 and the gate of the second triac 13a, and receives the light from the second light emitting element 13b, and receives the single-phase AC power supply 10 Is supplied to the gate of the second triac 13a. The second current limiting resistor 13d is a resistor for limiting the current input to the second phototriac 13c. The second instruction signal, the second triac 13a, the second light emitting element 13b, the second phototriac 13c, and the second current limiting resistor 13d are respectively the first instruction signal, the first triac 12a, the first light emitting element 12b, This corresponds to the one phototriac 12c and the first current limiting resistor 12d, and detailed description thereof will be omitted.

  The first rectifier circuit 14 is a circuit that rectifies an AC signal from the single-phase AC power supply 10. The first rectifier circuit 14 outputs a first instruction signal when the single-phase reversible motor 11 is rotated in the first direction. As shown in FIG. 1, the first rectifier circuit 14 includes a diode bridge 14a, a step-down resistor 14b, a constant voltage diode 14c, a capacitor 14d, and a first constant current diode 14e.

  The AC signal input to the first rectifier circuit 14 is full-wave rectified by a diode bridge 14a formed of four diodes. The rectified voltage is divided by the step-down resistor 14b and the constant voltage diode 14c. By using the constant voltage diode 14c for the voltage division, heat generation at the time of voltage division can be suppressed. The capacitor 14d disposed in parallel with the constant voltage diode 14c is a smoothing capacitor. The anode side of the first constant current diode 14e is connected to the anode side of the constant voltage diode 14c, and the first instruction signal is output from the first rectifier circuit 14 via the first constant current diode 14e. By outputting the first instruction signal via the first constant current diode 14e, the current of the first instruction signal can be set to a predetermined value. As a result, the light emission of the light emitting element by the first instruction signal can be stabilized, and the operation of a semiconductor relay or the like that operates according to the light emission can also be stabilized. That is, it is possible to avoid a situation in which the light emitting element does not emit light even when the first instruction signal is output. In addition, although the connection method of the light emitting element light-emitted by a 1st instruction | indication signal is not ask | required, it is suitable that those light emitting elements are connected in series. For example, in FIG. 1, the light emitting element of the semiconductor relay 34 that emits light in response to the first instruction signal, the light emitting element of the semiconductor relay 31, and the first light emitting element 12 b are connected in series. The order of series connection is not limited. In addition, since the first instruction signal is output from the first constant current diode 14e only when full-wave rectification of the AC signal is performed by the diode bridge 14a, the first rectifier circuit 14 includes the single-phase AC power supply 10. The first instruction signal is output only during the period when the AC signal from is input. Further, the cathode side of the last light emitting element (the first light emitting element 12b in FIG. 1) that emits light according to the first instruction signal is connected to the negative electrode side of the first rectifier circuit 14.

  The second rectifier circuit 15 is a circuit that rectifies an AC signal from the single-phase AC power supply 10. The second rectifier circuit 15 outputs a second instruction signal when the single-phase reversible motor 11 is rotated in the second direction. As shown in FIG. 1, the second rectifier circuit 15 includes a diode bridge 15a, a step-down resistor 15b, a constant voltage diode 15c, a capacitor 15d, and a second constant current diode 15e. The second instruction signal is output from the second rectifier circuit 15 via the second constant current diode 15e. In addition, although the connection method of the light emitting element light-emitted by a 2nd instruction | indication signal is not ask | required, it is suitable that those light emitting elements are connected in series. For example, in FIG. 1, the light emitting element of the semiconductor relay 32 that emits light in response to the second instruction signal, the light emitting element of the semiconductor relay 33, and the second light emitting element 13b are connected in series. The order of series connection is not limited. The cathode side of the last light emitting element (second light emitting element 13b in FIG. 1) that emits light in response to the second instruction signal is connected to the negative electrode side of the second rectifier circuit 15. The diode bridge 15a, the step-down resistor 15b, the constant voltage diode 15c, the capacitor 15d, and the second constant current diode 15e are respectively replaced with the diode bridge 14a, the step-down resistor 14b, the constant voltage diode 14c, the capacitor 14d, and the first constant current diode 14e. Corresponding, detailed description about them is omitted.

  Note that the first rectifier circuit 14 may return the state of the first instruction signal to a control unit such as a CPU. In this case, the first rectifier circuit 14 may include an a-contact semiconductor relay that operates according to the first instruction signal. The output of the semiconductor relay is returned to the control means. Further, when the DC signal obtained by converting the AC signal from the single-phase AC power source 10 by the AC / DC converter is input to the semiconductor relay and closed by the first instruction signal, the DC signal is controlled by the control means. May be output. The output of the semiconductor relay allows the control means to know the state of the first instruction signal, and as a result, also knows the open / closed state of the first open / close circuit 12. The same applies to the second rectifier circuit 15.

  The switch 16 is connected to the single-phase AC power supply 10 and the semiconductor relays 31 and 33 and is turned on when the single-phase reversible motor 11 rotates. Therefore, when the single-phase reversible motor 11 is rotating, AC power is supplied to the semiconductor relays 31 and 33 via the switch 16, and when the single-phase reversible motor 11 is stopped, the semiconductor relay 31. , 33 is cut off by the switch 16 from the supply of AC power. The switch 16 may be turned on only during a period from the start of rotation of the single-phase reversible motor 11 to the end of rotation for one tap.

  The switch 17 is disposed between the single-phase AC power supply 10 and the third switching circuit 18, and is turned on when the tap switching device 1 is automatically controlled, and is opened when the tap control device 1 is not automatically controlled. Therefore, in the case of automatic control, the single-phase AC power supply 10 is supplied to the third switching circuit 18.

  The third opening / closing circuit 18 is a circuit shown in FIG. 2 and includes NOT elements 18a to 18c and semiconductor relays 18d and 18e having contact a. The cathode side of each light emitting element included in the semiconductor relays 18d and 18e is connected to an insulating ground.

  The 90_1 / 2 signal is a signal that is at a high level (H) when the single-phase reversible motor 11 is rotated in the first direction and is at a low level (L) when the single-phase reversible motor 11 is rotated in the second direction. The direction in which the single-phase reversible motor 11 is rotated depends on the power transmission direction in the SVR. For example, in the case of forward power transmission in SVR, the single-phase reversible motor 11 is rotated in the first direction when boosting the secondary side voltage, and the single-phase reversible motor 11 is rotated in the second direction when stepping down. In the case of reverse power transmission, the single-phase reversible motor 11 is rotated in the second direction when boosting the primary side voltage, and the single-phase reversible motor 11 is rotated in the first direction when stepping down. Good. The 90_1 / 2 signal is input to the NOT elements 18a and 18c, respectively. The 90ENB signal is normally H, and is a signal that becomes L when tap switching is performed. The 90ENB signal is an enable signal used to control whether to operate the NOT elements 18a to 18c. When the 90ENB signal is H, the NOT elements 18a to 18c do not operate and the 90ENB signal is L. In this case, the NOT elements 18a to 18c operate. For example, the 90_1 / 2 signal and the 90ENB signal may be input from a control unit that controls the tap switching device 1. When the control is performed using software, the control means may be constituted by a CPU or the like, for example.

  The semiconductor relay 18d is disposed between the switch 17 and the semiconductor relay 32, and a signal from the NOT element 18b is input to the light emitting element of the semiconductor relay 18d. Therefore, the semiconductor relay 18d is closed when the signal from the NOT element 18b becomes H, and is opened when the signal becomes L. The semiconductor relay 18d temporarily supplies an AC signal from the single-phase AC power supply 10 to the first rectifier circuit 14 when the single-phase reversible motor 11 is rotated in the first direction by automatic control. “Temporarily” means at least the start of supply of an AC signal by a self-holding circuit described later. The semiconductor relay 18e is disposed between the switch 17 and the semiconductor relay 34, and a signal from the NOT element 18c is input to the light emitting element of the semiconductor relay 18e. Therefore, the semiconductor relay 18e is closed when the signal from the NOT element 18c becomes H, and is opened when the signal becomes L. The semiconductor relay 18e temporarily supplies an AC signal from the single-phase AC power supply 10 to the second rectifier circuit 15 when the single-phase reversible motor 11 is rotated in the second direction by automatic control. Therefore, when rotating the single-phase reversible motor 11 in the first direction, the 90_1 / 2 signal is first set to H, and then the 90ENB signal is changed from H to L. As a result, each NOT element 18a-18c operates, and a high level signal is input to the light emitting element of the semiconductor relay 18d, but a low level signal is input to the light emitting element of the semiconductor relay 18e. Only the semiconductor relay 18d is closed, and an AC signal is supplied to the semiconductor relay 32. As will be described later, after an AC signal is supplied to the first rectifier circuit 14 via the semiconductor relay 18d, the supply of the AC current to the first rectifier circuit 14 is self-maintained. After, the 90ENB signal may be returned to H. Further, after the self-holding, the 90_1 / 2 signal may also become L. When the single-phase reversible motor 11 is rotated in the second direction, the 90_1 / 2 signal is first set to L, and then the 90ENB signal is changed from H to L. As a result, each NOT element 18a-18c operates, and a high level signal is input to the light emitting element of the semiconductor relay 18e, but a low level signal is input to the light emitting element of the semiconductor relay 18d. Only the semiconductor relay 18e is closed, and an AC signal is supplied to the semiconductor relay 34. As will be described later, after the AC signal is supplied to the second rectifier circuit 15 via the semiconductor relay 18e, the supply of the AC current to the second rectifier circuit 15 is self-maintained. After that, the 90ENB signal may be returned to L.

  The open / closed state of the semiconductor relays 18d and 18e may be returned to the control means such as a CPU. In this case, the third switching circuit 18 may include an a-contact semiconductor relay that operates according to the output of the NOT element 18b and an a-contact semiconductor relay that operates according to the output of the NOT element 18c. The outputs of these semiconductor relays are returned to the control means. Moreover, when the DC signal from the AC / DC converter for converting the AC signal into the DC signal is input to these semiconductor relays and closed by the output from the NOT elements 18b and 18c, the DC signal is controlled by the control means. May be output. Based on the output of the semiconductor relay, the control means can know the open / closed state of the semiconductor relays 18d and 18e.

  The switch 19 is disposed between the single-phase AC power supply 10 and the step-up switch 20 and the step-down switch 21 and is turned on when the tap switching device 1 is manually controlled, and is opened when the tap control device 1 is not manually controlled. Therefore, in the case of manual control, the single-phase AC power supply 10 is supplied to the step-up switch 20 and the step-down switch 21.

  The step-up switch 20 is disposed between the switch 19 and the fourth opening / closing circuit 22, and temporarily turns the AC signal of the single-phase AC power supply 10 into the first phase when rotating the single-phase reversible motor 11 to the step-up side by manual control. 4 is supplied to the open / close circuit 22. Therefore, the boost switch 20 is temporarily turned on when boosting is performed in manual control, and is opened otherwise.

  The step-down switch 21 is disposed between the switch 19 and the fourth opening / closing circuit 22, and temporarily rotates the AC signal of the single-phase AC power supply 10 when the single-phase reversible motor 11 is rotated to the step-down side by manual control. 4 is supplied to the open / close circuit 22. Therefore, the step-down switch 21 is temporarily turned on when the step-down is performed in the manual control, and is opened otherwise.

  The fourth open / close circuit 22 is, for example, the circuit shown in FIG. 3, and includes a signal output unit 22a, an a-contact semiconductor relay 22b, a b-contact semiconductor relay 22c, an a-contact semiconductor relay 22d, and a b-contact semiconductor relay 22e. With. The cathode side of each light emitting element included in the semiconductor relays 22b to 22e is connected to an insulating ground.

  The signal output unit 22a outputs the first and second reverse power transmission signals when the power transmission direction in the SVR is reverse power transmission, and does not output the first and second reverse power transmission signals when the power transmission direction is forward power transmission. The first reverse power transmission signal is input to the light emitting elements of the b-contact semiconductor relays 22c and 22e, and the second reverse power transmission signal is input to the light-emitting elements of the a-contact semiconductor relays 22b and 22d. The first and second reverse power transmission signals are signals for causing each light emitting element included in the semiconductor relays 22b to 22e to emit light.

  The a-contact semiconductor relay 22b is disposed between the boost switch 20 and the second rectifier circuit 15 and operates in accordance with a second reverse power transmission signal input during reverse power transmission. That is, the a-contact semiconductor relay 22b is closed when the second reverse power transmission signal is input, and is opened when it is not.

  The b-contact semiconductor relay 22c is disposed between the boost switch 20 and the first rectifier circuit 14, and operates in accordance with a first reverse power transmission signal input during reverse power transmission. That is, the b-contact semiconductor relay 22c is opened when the first reverse power transmission signal is input, and is closed otherwise.

  The a-contact semiconductor relay 22d is disposed between the step-down switch 21 and the first rectifier circuit 14, and operates in accordance with a second reverse power transmission signal input during reverse power transmission. That is, the a-contact semiconductor relay 22d is closed when the second reverse power transmission signal is input, and is opened when it is not.

  The b-contact semiconductor relay 22e is disposed between the step-down switch 21 and the second rectifier circuit 15 and operates in accordance with a first reverse power transmission signal input during reverse power transmission. That is, the b-contact semiconductor relay 22e is opened when the first reverse power transmission signal is input, and is closed otherwise.

  When the first and second reverse power transmission signals are not output from the signal output unit 22a, that is, in the case of forward power transmission, the a-contact semiconductor relays 22b and 22d are opened and the b-contact semiconductor relays 22c and 22e are closed. Will be. Therefore, when the step-up switch 20 is turned on, an AC signal is supplied to the first rectifier circuit 14, the single-phase reversible motor 11 is rotated in the first direction, and when the step-down switch 21 is turned on, the second rectification is performed. An AC signal is supplied to the circuit 15 and the single-phase reversible motor 11 is rotated in the second direction. On the other hand, when the first and second reverse power transmission signals are output from the signal output unit 22a, that is, in the case of reverse power transmission, the a-contact semiconductor relays 22b and 22d are closed and the b-contact semiconductor relays 22c and 22e are opened. Will be. Therefore, when the step-up switch 20 is turned on, an AC signal is supplied to the second rectifier circuit 15 so that the single-phase reversible motor 11 is rotated in the second direction, and when the step-down switch 21 is turned on, the first rectification is performed. An AC signal is supplied to the circuit 14 and the single-phase reversible motor 11 is rotated in the first direction.

  Here, the operation timings of the a-contact semiconductor relays 22b and 22d and the b-contact semiconductor relays 22c and 22e may be different. For example, the a-contact semiconductor relays 22b and 22d may have earlier operation timings than the b-contact semiconductor relays 22c and 22e, and the b-contact semiconductor relays 22c and 22e are faster than the a-contact semiconductor relays 22b and 22d. However, the operation timing may be early. Therefore, when both are controlled by the same signal, all the semiconductor relays 22b to 22e are temporarily closed, and when the step-up switch 20 or the step-down switch 21 is turned on, the first phase of the single-phase reversible motor 11 is changed. Since the single-phase AC power supply 10 is supplied to both the first and second terminals 11d and 11e, the single-phase reversible motor 11 may break down. Therefore, it is preferable that the first and second reverse power transmission signals are output so that there is no period in which both the a-contact semiconductor relays 22b and 22d and the b-contact semiconductor relays 22c and 22e are closed simultaneously. Therefore, the signal output unit 22a first outputs the first reverse transmission signal when the forward transmission is switched to the reverse transmission in the SVR, and then outputs the second reverse transmission signal, and the reverse transmission is switched to the forward transmission. At this time, the output of the second reverse power transmission signal may be stopped first, and then the output of the first reverse power transmission signal may be stopped. If the time difference between the operation timings of the a-contact semiconductor relays 22b and 22d and the b-contact semiconductor relays 22c and 22e is TD, the signal output unit 22a outputs the first reverse power transmission signal after TD or more has elapsed. The output of the first reverse power transmission signal may be stopped after TD or more has elapsed since the second reverse power transmission signal was output and the output of the second reverse power transmission signal was stopped. Further, for example, a period from the output of the first reverse power transmission signal to the output of the second reverse power transmission signal and a period from the stop of the output of the second reverse power transmission signal to the stop of the output of the first reverse power transmission signal are set to TD + ε. In some cases, ε is preferably a small positive value. This is because it is preferable that the operation timings of the a-contact semiconductor relays 22b and 22d and the b-contact semiconductor relays 22c and 22e do not deviate too much. When the signal output unit 22a outputs the first and second reverse power transmission signals as described above, the operation timing of the a-contact semiconductor relays 22b and 22d and the operation timing of the b-contact semiconductor relays 22c and 22e is earlier. Even if it exists, it can be made that there is no period when both semiconductor relays are closed simultaneously.

  FIG. 4 is a timing chart showing an example of the first and second reverse power transmission signals and the states of the semiconductor relays 22b to 22e. In FIG. 4, it is assumed that the b-contact semiconductor relay has a later operation timing than the a-contact semiconductor relay. 4A and 4B, the rising edge of the second reverse power transmission signal indicated by the solid line, that is, the output timing of the second reverse power transmission signal is the rising edge of the first reverse power transmission signal, that is, the first reverse power transmission signal. It is later than the output timing. Therefore, in FIGS. 4C and 4D, the timing when the a-contact semiconductor relays 22b and 22d indicated by the solid lines are turned on is later than the timing when the b-contact semiconductor relays 22c and 22e are opened. Thus, it is possible to avoid that both semiconductor relays are turned on simultaneously. On the other hand, when such timing adjustment is not performed, the second reverse power transmission signal is output as shown by the broken line in FIG. 4B, and the a-contact semiconductor relays 22b and 22d are turned on. The timing is earlier than the timing at which the b-contact semiconductor relays 22c and 22e are opened, as indicated by the broken line in FIG. As a result, there is a period in which both semiconductor relays are temporarily turned on at the same time. When the step-up switch 20 or the step-down switch 21 is turned on during that period, the first and second reversing motors 11 of the single-phase reversible motor 11 are turned on. AC power is supplied to both of the second terminals 11d and 11e, and the single-phase reversible motor 11 fails. Thus, it becomes possible to prevent such a failure of the single-phase reversible motor 11 by appropriately controlling the first and second reverse power transmission signals.

  In the above description, the case where the output timings of the first and second reverse power transmission signals are changed both when the forward power transmission is changed to the reverse power transmission and when the reverse power transmission is changed to the forward power transmission has been described. It does n’t have to be. For example, when it is known which of the operation timing of the a contact semiconductor relay and the operation timing of the b contact semiconductor relay is earlier, when the forward transmission is changed to the reverse transmission, and when the reverse transmission is changed to the forward transmission Only one of them may be used to change the timing related to the first and second reverse power transmission signals. Specifically, when the operation timing of the b-contact semiconductor relay is later than that of the a-contact semiconductor relay, the signal output unit 22a sends the first reverse power transmission signal first when the forward power transmission is switched to the reverse power transmission. And then the second reverse power transmission signal is output, and when the reverse power transmission becomes the forward power transmission, the output of the first and second reverse power transmission signals may be stopped simultaneously. When the operation timing of the a-contact semiconductor relay is later than that of the b-contact semiconductor relay, the signal output unit 22a outputs the first and second reverse power transmission signals when the forward power transmission is reversed. When the power is output at the same time and the reverse power transmission is switched to the forward power transmission, the output of the second reverse power transmission signal may be stopped first, and then the output of the first reverse power transmission signal may be stopped.

  The semiconductor relay 31 is connected to the switch 16 and is an a-contact semiconductor relay that supplies an AC signal from the single-phase AC power supply 10 supplied via the switch 16 to the first rectifier circuit 14 in response to the first instruction signal. It is. That is, the semiconductor relay 31 is closed when the first instruction signal is input, and is opened otherwise. In FIG. 1, the positive side of the first rectifier circuit 14 is connected to the anode side of the light emitting element included in the semiconductor relay 31 via the light emitting element of the semiconductor relay 34. If an AC signal is supplied to the first rectifier circuit 14 even temporarily, the single-phase reversible motor 11 starts to rotate accordingly, the switch 16 is turned on, and the semiconductor relay 31 is closed. It will be. As a result, even if an AC signal is no longer supplied from the third switching circuit 18 or the fourth switching circuit 22 to the first rectifier circuit 14, an AC signal is supplied to the first rectifier circuit 14 via the semiconductor relay 31. Become. Therefore, the semiconductor relay 31 is a circuit that self-holds the supply of the AC signal to the first rectifier circuit 14.

  The semiconductor relay 32 is a b-contact semiconductor relay disposed between the third switching circuit 18, the fourth switching circuit 22, the semiconductor relay 31, and the first rectifier circuit 14. The semiconductor relay 32 supplies an AC signal to the first rectifier circuit 14 in response to the second instruction signal. That is, the semiconductor relay 32 is opened when the second instruction signal is input, and is closed otherwise. In FIG. 1, the positive side of the second rectifier circuit 15 is connected to the anode side of the light emitting element included in the semiconductor relay 32. When the second instruction signal is output from the second rectifier circuit 15, the single-phase AC power supply 10 is supplied to the second terminal 11 e of the single-phase reversible motor 11. By opening the first rectifier circuit 14 so as not to operate, it is possible to prevent the single-phase AC power supply 10 from being supplied also to the first terminal 11d, and to prevent the single-phase reversible motor 11 from failing. Can do.

  The semiconductor relay 33 is connected to the switch 16 and supplies an AC signal from the single-phase AC power supply 10 supplied via the switch 16 to the second rectifier circuit 15 in response to the second instruction signal. It is. That is, the semiconductor relay 33 is closed when the second instruction signal is input, and is opened otherwise. In FIG. 1, the positive side of the second rectifier circuit 15 is connected to the anode side of the light emitting element included in the semiconductor relay 33 via the light emitting element of the semiconductor relay 32. The semiconductor relay 33 corresponds to the semiconductor relay 31 provided on the second rectifier circuit 15 side, and detailed description thereof is omitted.

  The semiconductor relay 34 is a b-contact semiconductor relay disposed between the third switching circuit 18, the fourth switching circuit 22, the semiconductor relay 33, and the second rectifier circuit 15. The semiconductor relay 34 supplies an AC signal to the second rectifier circuit 15 in response to the first instruction signal. That is, the semiconductor relay 34 is opened when the first instruction signal is input, and is closed otherwise. In FIG. 1, the positive side of the first rectifier circuit 14 is connected to the anode side of the light emitting element included in the semiconductor relay 34. The semiconductor relay 34 corresponds to the semiconductor relay 32 provided on the second rectifier circuit 15 side, and detailed description thereof is omitted.

  Each of the semiconductor relays 18d, 18e, 22b to 22e, 31 to 34 includes an input side circuit having a light emitting element, and an output side circuit having a semiconductor switch that is turned on or off when the light emitting element emits light. For example, it may be a photo MOS relay, and is configured by using a triac, a light emitting element, and a phototriac, like the first switching circuit 12 and the second switching circuit 13. It may be a semiconductor relay or a semiconductor relay having another configuration. Since a large current does not flow through these semiconductor relays 18d, 18e, 22b to 22e, and 31 to 34, a low-capacity semiconductor relay such as a photo MOS relay can be used. Further, the tap switching device 1 has a varistor (in parallel with the semiconductor relays 18d, 18e, 22b to 22e, 31 to 34, respectively) in order to protect the semiconductor relays 18d, 18e, 22b to 22e, and 31 to 34 from overvoltage. (Not shown). Providing the varistor in parallel with the semiconductor relay may be providing the varistor in parallel with the output side circuit of the semiconductor relay. In addition, by connecting a varistor that operates between the working voltage of the semiconductor element and the absolute rated voltage in parallel with the semiconductor element, the varistor operates before reaching the absolute rated voltage when overvoltage is applied, and current flows. Thus, the semiconductor element is protected. Therefore, it is preferable that the varistor connected in parallel with the semiconductor relay operates between the working voltage of the semiconductor relay and the absolute rated voltage. Moreover, LED may be sufficient as the light emitting element contained in the input side circuit of the semiconductor relay. Further, the semiconductor relay may be other than those described above as long as it is composed of semiconductor elements.

  The limit switch 35 is a b-contact switch that is opened when the single-phase reversible motor 11 rotating in the first direction rotates beyond the terminal tap. The limit switch 35 can prevent the single-phase reversible motor 11 from rotating beyond the terminal tap in the first direction.

  The limit switch 36 is a b-contact switch that is opened when the single-phase reversible motor 11 rotating in the second direction rotates beyond the terminal tap. The limit switch 36 can prevent the single-phase reversible motor 11 from rotating beyond the terminal tap in the second direction.

  It should be noted that resistors for preventing erroneous lighting are added to the light emitting elements of the semiconductor relays 18d, 18e, 22b to 22e, 31 to 34, and the first and second light emitting elements 12b and 13b of the first and second switching circuits 12 and 13. May be provided in parallel, or a capacitor for noise removal may be provided in parallel.

  Next, the operation of the tap switching device 1 according to this embodiment will be described. First, a case where automatic control is performed will be described. In this case, it is assumed that the switch 17 is turned on and the switch 19 is opened. It is assumed that in the SVR having the tap switching device 1, forward power transmission is performed, and it is necessary to boost the secondary side for voltage adjustment. Then, it is assumed that the control means (not shown) sets the 90_1 / 2 signal to H and then changes the 90ENB signal from H to L. Then, the semiconductor relay 18d is closed, but the semiconductor relay 18e remains open. As a result, an AC signal is supplied to the first rectifier circuit 14 via the semiconductor relay 18 d, and the first instruction signal is output from the first rectifier circuit 14 to the first switching circuit 12 and the semiconductor relays 31 and 34. In response to the output of the first instruction signal, the a-contact semiconductor relay 31 is turned on, and the b-contact semiconductor relay 34 is opened, thereby reliably preventing the supply of the AC signal to the second rectifier circuit 15. It will be. The first light emitting element 12b emits light in response to the output of the first instruction signal, and the alternating current signal flows in the first triac 12a in response to the alternating current signal flowing in the first phototriac 12c. As a result, the single-phase AC power supply 10 is supplied to the first terminal 11d, and the single-phase reversible motor 11 rotates in the first direction. The switch 16 is turned on according to the rotation. Further, since the semiconductor relay 31 is turned on in response to the output of the first instruction signal, an AC signal is supplied to the first rectifier circuit 14 via the switch 16 and the semiconductor relays 31 and 32. As described above, after the AC signal is supplied to the first rectifier circuit 14 by the self-holding circuit, the control unit converts the 90_1 / 2 signal and the 90ENB signal to the initial state signals L and H, respectively. Return to. As a result, the semiconductor relays 18d and 18e are both opened, but the supply of the AC signal to the first rectifier circuit 14 is continued through the self-holding circuit.

  When the single-phase reversible motor 11 rotates in the first direction by one tap, the switch 16 is opened. In response to the opening of the switch 16, the supply of the AC signal to the first rectifier circuit 14 is interrupted, and the output of the first instruction signal is stopped. As a result, the supply of AC power via the first opening / closing circuit 12 is interrupted, and the single-phase reversible motor 11 stops. In addition, the semiconductor relays 31 and 34 each return to the initial state.

  When performing step-down voltage adjustment in SVR, control means (not shown) sets the 90_1 / 2 signal to L, and then changes the 90ENB signal from H to L. Then, the semiconductor relay 18d remains open, but the semiconductor relay 18e is closed. Then, an AC signal is supplied to the second rectifier circuit 15 via the semiconductor relay 18 e, and a second instruction signal is output from the second rectifier circuit 15 to the second switching circuit 13 and the semiconductor relays 32 and 33. In response to the output of the second instruction signal, the a-contact semiconductor relay 33 is turned on, and the b-contact semiconductor relay 32 is opened, thereby reliably preventing the supply of the AC signal to the first rectifier circuit 14. It will be. The second light emitting element 13b emits light in response to the output of the second instruction signal, and the AC signal flows in the second triac 13a in response to the AC signal flowing in the second phototriac 13c. As a result, the single-phase AC power supply 10 is supplied to the second terminal 11e, and the single-phase reversible motor 11 rotates in the second direction. In response to the rotation, the switch 16 is turned on, and an AC signal is supplied to the second rectifier circuit 15 via the self-holding circuit. Thereafter, the control means returns the 90_1 / 2 signal and the 90ENB signal to the initial state signals L and H, respectively.

  When the single-phase reversible motor 11 rotates in the second direction by one tap, the switch 16 is opened. In response to the opening of the switch 16, the supply of the AC signal to the second rectifier circuit 15 is interrupted, and the output of the second instruction signal is stopped. As a result, the supply of AC power via the second opening / closing circuit 13 is cut off, so that the single-phase reversible motor 11 stops. Further, the semiconductor relays 32 and 33 are returned to the initial state.

  Next, a case where manual control is performed will be described. In this case, it is assumed that the switch 19 is turned on and the switch 17 is opened. Further, it is assumed that forward power transmission is performed in the SVR having the tap switching device 1. Then, since the first and second reverse power transmission signals are not output from the signal output unit 22a, the a-contact semiconductor relays 22b and 22d are opened, and the b-contact semiconductor relays 22c and 22e are turned on. In such a state, it is assumed that the secondary side of the SVR needs to be boosted. Then, it is assumed that the operator or the like has turned on the boost switch 20 manually or remotely. In response to the boost switch 20 being turned on, an AC signal is supplied to the semiconductor relay 32 via the b-contact semiconductor relay 22c. Subsequent operations are the same as when the semiconductor relay 18d is closed during automatic control, and the description thereof is omitted. The step-up switch 20 may be opened after the single-phase reversible motor 11 starts to rotate in the first direction. This is because the supply of the AC signal to the first rectifier circuit 14 is continued by the self-holding circuit. The single-phase reversible motor 11 stops when it rotates in the first direction by one tap. Further, it is assumed that the secondary side of the SVR needs to be stepped down, and an operator or the like has turned on the step-down switch 21 manually or remotely. When the step-down switch 21 is turned on, an AC signal is supplied to the semiconductor relay 34 via the b-contact semiconductor relay 22e. The subsequent operation is the same as that when the semiconductor relay 18e is closed during automatic control, and the description thereof is omitted. The single-phase reversible motor 11 stops when it rotates in the second direction by one tap. Further, in the SVR having the tap switching device 1, it is assumed that the forward power transmission is switched to the reverse power transmission. Then, in response to detection of the change in the power transmission direction, the signal output unit 22a first outputs the first reverse power transmission signal to the b-contact semiconductor relays 22c and 22e, and then the second reverse power transmission signal to the a-contact semiconductor relay. Output to 22b and 22d. As a result, the b-contact semiconductor relays 22c and 22e are opened, and then the a-contact semiconductor relays 22b and 22d are turned on. In the case of reverse power transmission, since a substation exists on the secondary side, the voltage adjustment target in the SVR is the primary side. In such a state, it is assumed that the primary side of the SVR needs to be boosted. When the booster switch 20 is manually or remotely operated by an operator or the like, an AC signal is supplied to the semiconductor relay 34 via the a-contact semiconductor relay 22b accordingly. The subsequent operation is the same as that when the semiconductor relay 18e is closed during automatic control, and the description thereof is omitted. Also, it is assumed that the primary side of the SVR needs to be stepped down during reverse power transmission, and the operator or the like has turned on the step-down switch 21 manually or remotely. When the step-down switch 21 is turned on, an AC signal is supplied to the semiconductor relay 32 via the a-contact semiconductor relay 22d. Subsequent operations are the same as when the semiconductor relay 18d is closed during automatic control, and the description thereof is omitted.

  As described above, according to the tap switching device 1 according to the present embodiment, since a semiconductor relay or the like is used instead of the mechanical relay, the number of mechanical movable parts is reduced and the life is extended. Moreover, compared with the case where the mechanical relay is used, it becomes strong also to a vibration and an impact. Further, since the tap switching device 1 constituted by semiconductor elements operates in the same manner as a tap switching device using a conventional mechanical relay, the conventional tap switching device can be easily changed to the tap switching device 1 according to the present embodiment. It can also be replaced. Further, the first and second switching circuits 12 and 13 are configured by using the first and second triacs 12a and 13a and the first and second phototriacs 12c and 13c, so that the single-phase reversible motor 11 is used. It is possible to control the opening and closing of high current alternating current. Conventionally, there is no semiconductor relay in which both the input side and the output side are alternating current, but the first and second rectifier circuits 14 and 15 for outputting the first and second instruction signals are provided on the input side, and the first Since the first and second open / close circuits 12 and 13 are controlled by the second instruction signal, the output of the AC power supply can be controlled as a whole in accordance with the input of the AC signal. In addition, since the tap switching device 1 includes the first and second rectifier circuits 14 and 15, even if the AC / DC converter in the SVR fails, at least the tap switching device 1 is operated by manual control. Will be able to. When the SVR AC / DC converter fails, no DC power is supplied to the control means or the like, so that no AC signal is output from the third switching circuit 18, and the first and second signals are output from the signal output unit 22a. The reverse power transmission signal is not output. On the other hand, since the AC signal can be supplied through the b-contact semiconductor relays 22c and 22e in the fourth switching circuit 22, the single-phase reversible motor 11 is moved to the first phase by operating the step-up switch 20 and the step-down switch 21. It can be rotated in the direction or the second direction. Therefore, as described above, even if the AC / DC converter used as the DC power source fails, at least step-up and step-down by manual control can be performed. In addition, since the first and second constant current diodes 14e and 15e are provided on the output sides of the first and second rectifier circuits 14 and 15, respectively, the first and second instruction signals become predetermined currents. Can be. As a result, the light emission of the light emitting element in the semiconductor relay or the like by the first and second instruction signals can be stabilized, and the semiconductor relay or the like can operate stably. In the fourth switching circuit 22, the first and second reverse power transmission signals are output so that there is no period in which both the a-contact semiconductor relays 22b and 22d and the b-contact semiconductor relays 22c and 22e are closed at the same time. The failure of the single-phase reversible motor 11 due to the simultaneous supply of AC signals to both the first and second rectifier circuits 14 and 15 can be avoided.

  In addition, in this Embodiment, although the tap switching apparatus 1 demonstrated the structure which does not contain a mechanical relay, it may not be so. Also in the tap switching device 1, a mechanical relay may be used for a relay that is used less frequently. This is because the life of the device can be extended by configuring a frequently used relay with a semiconductor element. For example, when the direction of the substation does not change so much, in the fourth switching circuit 22, an a-contact mechanical relay may be used instead of the a-contact semiconductor relays 22b and 22d, and the b-contact semiconductor relays 22c and 22e. Instead of this, a b-contact mechanical relay may be used. Even in that case, as described above, it is preferable that the first and second reverse power transmission signals are output so that there is no period in which both the a-contact mechanical relay and the b-contact mechanical relay are closed simultaneously.

  Moreover, although this Embodiment demonstrated the case where the timing of the 1st and 2nd reverse power transmission signal input into each semiconductor relay 22b-22e was changed in the 4th switching circuit 22, it is not so Good. For example, when the operation timings of the a-contact semiconductor relays 22b and 22d and the b-contact semiconductor relays 22c and 22e are the same, all the semiconductor relays 22b to 22e may be controlled by one reverse power transmission signal. .

  Further, in the present embodiment, the case where the first and second instruction signals are respectively output via the first and second constant current diodes 14e and 15e in the first and second rectifier circuits 14 and 15 has been described. But it doesn't have to be. When the semiconductor relay or the like can be stably operated even if the first and second instruction signals are not output via the constant current diode, the first and second rectifier circuits 14 and 15 are The second constant current diodes 14e and 15e may not be provided.

  In the present embodiment, the case where the first and second rectifier circuits 14 and 15 have the configuration shown in FIG. 1 has been described, but this need not be the case. For example, the rectification may be performed by a configuration other than the diode bridges 14a and 15a, and the DC voltage may be divided by a configuration other than the step-down resistors 14b and 15b and the constant voltage diodes 14c and 15c. For example, a resistor may be used instead of the constant voltage diodes 14c and 15c.

  In the present embodiment, the case where the first and second open / close circuits 12 and 13 include a triac, a light emitting element, and a phototriac has been described. If the supply of AC power necessary for the operation of the single-phase reversible motor 11 can be controlled, the first and second terminals of the single-phase reversible motor 11 can be controlled by other first and second open / close circuits configured by semiconductor elements. The supply of AC power to 11d and 11e may be controlled.

  In the above embodiment, each process or each function may be realized by centralized processing by a single device or a single system, or may be distributedly processed by a plurality of devices or a plurality of systems. It may be realized by doing.

  Further, the present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that these are also included in the scope of the present invention.

  As described above, according to the tap switching device according to the present invention, it is possible to obtain an effect that it has a longer life and is resistant to vibration and shock, and is useful as a tap switching device that switches the tap of the adjustment transformer of the automatic voltage regulator. .

DESCRIPTION OF SYMBOLS 1 Tap switching device 11 Single-phase reversible motor 12 1st switching circuit 12a 1st triac 12b 1st light emitting element 12c 1st phototriac 13 2nd switching circuit 13a 2nd triac 13b 2nd light emitting element 13c 2nd phototriac 14 1st Rectifier circuit 14e First constant current diode 15 Second rectifier circuit 15e Second constant current diode 16, 17, 19 Switch 18d, 18e, 31, 32, 33, 34 Semiconductor relay 20 Step-up switch 21 Step-down switch 22a Signal output unit 22b, 22d a contact semiconductor relay 22c, 22e b contact semiconductor relay

Claims (6)

A motor that switches the energization tap of the adjustment transformer used in the automatic voltage regulator, has first and second terminals, and rotates in the first direction when a single-phase AC power supply is supplied to the first terminal. A single-phase reversible motor that is a motor that rotates in a second direction when a single-phase AC power is supplied to the second terminal;
A first rectifier circuit that rectifies an AC signal from the single-phase AC power source and that outputs a first instruction signal when rotating the single-phase reversible motor in a first direction;
A second rectifier circuit that rectifies an AC signal from the single-phase AC power source, and that outputs a second instruction signal when rotating the single-phase reversible motor in a second direction;
A first switch circuit that is a circuit configured to control the supply of the single-phase AC power to the first terminal in response to the first instruction signal and is configured using a semiconductor element;
Tap switching comprising: a second switching circuit that is a circuit that controls the supply of the single-phase AC power to the second terminal in response to the second instruction signal, and is a circuit configured using a semiconductor element apparatus. The first open / close circuit includes:
A first triac disposed between the single-phase AC power source and the first terminal;
A first light emitting element that emits light in response to the first instruction signal;
A first phototriac for supplying an AC signal from the single-phase AC power source to the gate of the first triac when receiving light from the first light emitting element;
The second opening / closing circuit includes:
A second triac disposed between the single-phase AC power source and the second terminal;
A second light emitting element that emits light in response to the second instruction signal;
2. The tap switching according to claim 1, further comprising: a second phototriac that supplies an AC signal from the single-phase AC power source to a gate of the second triac when receiving light from the second light emitting element. apparatus. The first and second rectifier circuits have first and second constant current diodes, respectively.
The first instruction signal is output from the first rectifier circuit through the first constant current diode,
The tap switching device according to claim 1 or 2, wherein the second instruction signal is output from the second rectifier circuit via the second constant current diode. When the single-phase reversible motor is rotated in the first direction by automatic control, a semiconductor relay that temporarily supplies an AC signal of the single-phase AC power source to the first rectifier circuit;
A semiconductor relay that temporarily supplies an AC signal of the single-phase AC power source to the second rectifier circuit when rotating the single-phase reversible motor in a second direction by automatic control;
A switch connected to the single-phase AC power source and turned on when the single-phase reversible motor rotates;
A semiconductor relay connected to the switch and supplying an AC signal from the single-phase AC power source supplied through the switch to the first rectifier circuit according to the first instruction signal;
A semiconductor relay connected to the switch and supplying an AC signal from the single-phase AC power source supplied through the switch to the second rectifier circuit in response to the second instruction signal;
4. The tap switching device according to claim 1, further comprising a varistor arranged in parallel with each of the semiconductor relays. 5. When forward transmission is performed in the automatic voltage regulator, the rotations in the first and second directions of the single-phase reversible motor are rotations on the boost side and the buck side, respectively.
When rotating the single-phase reversible motor to the boost side by manual control, a boost switch that temporarily supplies an AC signal of the single-phase AC power supply;
A step-down switch that temporarily supplies an AC signal of the single-phase AC power source when rotating the single-phase reversible motor to the step-down side by manual control;
A b-contact semiconductor relay disposed between the step-up switch and the first rectifier circuit and operating in response to a first reverse power transmission signal input during reverse power transmission;
A b-contact semiconductor relay disposed between the step-down switch and the second rectifier circuit and operating in response to the first reverse power transmission signal;
An a-contact semiconductor relay disposed between the step-up switch and the second rectifier circuit and operating in response to a second reverse power transmission signal input during reverse power transmission;
An a-contact semiconductor relay disposed between the step-down switch and the first rectifier circuit and operating in response to the second reverse power transmission signal;
A signal output unit that outputs the first and second reverse power transmission signals when the power transmission direction in the automatic voltage regulator is reverse power transmission; and
The said signal output part outputs the said 1st and 2nd reverse power transmission signal so that there may be no period when both the said a contact semiconductor relay and the said b contact semiconductor relay are closed simultaneously. Any one of the tap switching devices. The signal output unit outputs the first reverse power transmission signal first when the forward power transmission is switched to the reverse power transmission, and then outputs the second reverse power transmission signal, and then when the reverse power transmission is switched to the forward power transmission. The tap switching device according to claim 5, wherein the output of the second reverse power transmission signal is stopped first, and then the output of the first reverse power transmission signal is stopped.

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