WO2018070023A1 - On-load tap switching device - Google Patents

On-load tap switching device Download PDF

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Publication number
WO2018070023A1
WO2018070023A1 PCT/JP2016/080391 JP2016080391W WO2018070023A1 WO 2018070023 A1 WO2018070023 A1 WO 2018070023A1 JP 2016080391 W JP2016080391 W JP 2016080391W WO 2018070023 A1 WO2018070023 A1 WO 2018070023A1
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WO
WIPO (PCT)
Prior art keywords
transformer
switching device
load tap
tank
signal
Prior art date
Application number
PCT/JP2016/080391
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French (fr)
Japanese (ja)
Inventor
正斗 上田
健史 千切
啓 高野
裕通 田井
拓 石川
Original Assignee
株式会社東芝
東芝エネルギーシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 株式会社東芝, 東芝エネルギーシステムズ株式会社 filed Critical 株式会社東芝
Priority to PCT/JP2016/080391 priority Critical patent/WO2018070023A1/en
Publication of WO2018070023A1 publication Critical patent/WO2018070023A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only

Definitions

  • the embodiment of the present invention relates to an on-load tap switching device.
  • a load tap switching device that switches a transformation ratio during power supply in a transformer that supplies power to a load.
  • the on-load tap switching device switches a voltage adjustment tap provided on the transformer by a switching switch.
  • the on-load tap switching device includes a switching switch using a semiconductor switch (semiconductor element).
  • the semiconductor switch of the switching switch is supplied with a control signal for controlling the conduction state from a control circuit outside the switching switch.
  • High voltage is applied to the tap changer when loaded during testing.
  • the on-load tap changer and the control circuit must withstand the high voltage.
  • an optical trigger type semiconductor switch is used, or an electrical trigger type semiconductor switch is used to convert an optical signal into an electrical signal in the vicinity of the electric trigger type semiconductor switch.
  • There is a method of providing a drive circuit In any of the above cases, a power source for supplying power to the gate drive circuit from the outside is necessary, and the configuration of the on-load tap switching device becomes complicated.
  • the problem to be solved by the present invention is to provide an on-load tap switching device including an electric trigger type semiconductor switch in a switching switch with a simpler configuration.
  • the on-load tap switching device includes a switching switch and an insulation mediating unit.
  • the switching switch includes a semiconductor switch, and switches the transformation ratio by switching the connection relationship with the tap selector connected to the transformer.
  • the insulation mediating unit electrically insulates the semiconductor switch from the control circuit outside the transformer housing unit that houses the transformer, and mediates a signal from the control circuit to the gate terminal of the semiconductor switch. .
  • FIG. 1 is a configuration diagram of a transformer device 1 including a load tap switching device 10 according to an embodiment.
  • the block diagram which shows an example of the thyristor drive circuit of embodiment.
  • the block diagram which shows the outline
  • the block diagram which shows the outline
  • FIG. 1 is a configuration diagram of a transformer 1 including a load tap switching device 10 according to an embodiment.
  • the transformer device 1 includes a transformer tank 2 (transformer housing portion), a transformer 3, a load tap switching device 10 (tap switching device), and a control circuit 20.
  • the transformer tank 2 accommodates the transformer 3, the on-load tap switching device 10 and the like.
  • the inside of the transformer tank 2 is filled with an in-tank medium 4 such as insulating oil or gas.
  • an in-tank medium 4 such as insulating oil or gas.
  • the transformer 3 includes a winding and a plurality of taps for voltage adjustment attached to the winding.
  • the plurality of taps are connected to the on-load tap switching device 10, respectively.
  • the voltage adjustment winding may be branched from the main winding.
  • the control circuit 20 is installed outside the transformer tank 2, for example.
  • the control circuit 20 switches the transformation ratio in the transformer 1 by supplying a control signal to the on-load tap switching device 10.
  • the on-load tap switching device 10 includes a tap selector 11, a switching switch 12, a pulse transformer 14, and a tank 15.
  • the pulse transformer 14 is an example of an insulation mediator.
  • the tap selector 11 selects a pair of taps provided in one winding of the transformer 3. For example, the pair of taps are adjacent to each other among the plurality of taps for voltage adjustment of the transformer 3.
  • the tap selector 11 brings the pair of contacts into contact with the selected pair of taps.
  • One of the contacts that are paired with the tap selector 11 is in a conductive state, and the other is in a non-conductive state.
  • the tap selector 11 performs preprocessing for the switching switch 12 to switch taps by moving a contact that is not in a conductive state to a tap to be selected by an arm or the like and bringing it into contact with the tap.
  • the switching switch 12 switches the transformation ratio by switching the connection relationship with the tap selector 11 connected to the transformer 3.
  • the switching switch 12 is controlled by the control circuit 20 after the tap selector 11 brings a contact into contact with a desired tap, and switches the effective tap.
  • the tap selector 11 and the switching switch 12 it is possible to switch the transformation ratio in the transformer 1 without interrupting the circuit to which the load (not shown) is connected.
  • an electric trigger type thyristor 121 for switching the effective tap is incorporated.
  • the thyristor 121 includes a gate terminal 1211 to which a control signal is input.
  • the gate terminal 1211 is disposed on the surface of the thyristor 121 that is molded, for example.
  • a cable for connection is fixed to the gate terminal 1211 with a screw or the like.
  • the control circuit 20 switches the transformation ratio in the transformer 1 by switching the conduction state of the thyristor 121 in the switching switch 12.
  • the thyristor 121 is an example of a semiconductor switch.
  • the thyristor 121 may be replaced with a MOSFET (Metal / Oxide / Semiconductor / Field / Effect / Transistor), IGBT (Insulated / Gate / Bipolar / Transistor), or the like.
  • MOSFET Metal / Oxide / Semiconductor / Field / Effect / Transistor
  • IGBT Insulated / Gate / Bipolar / Transistor
  • the pulse transformer 14 forms an electromagnetic connection between the control circuit 20 and the switching switch 12.
  • a gate terminal 1211 on the thyristor 121 is connected to the secondary side of the pulse transformer 14.
  • the pulse transformer 14 mediates a signal from the control circuit 20 to the gate terminal 1211 on the thyristor 121 without obtaining electric power for controlling the thyristor 121.
  • the pulse transformer 14 electrically insulates the control circuit 20 and the thyristor 121 outside the transformer tank 2 of the transformer 3.
  • the pulse transformer 14 is installed inside the on-load tap changer 10 and is impregnated in the medium 5 in the tank. Thereby, insulation can be improved rather than the withstand voltage of the pulse transformer 14 single-piece
  • the withstand voltage of the pulse transformer 14 with respect to the ground potential and the withstand voltage between the windings of the pulse transformer 14 are higher than the withstand voltage of the tap selector 11 with respect to the ground potential. Therefore, it is possible to suppress the control circuit 20 from being damaged by the high voltage on the switching switch 12 side.
  • the tank 15 is accommodated in the transformer tank 2. At least the switching switch 12 is accommodated in one tank 15.
  • the switching switch 12 and the pulse transformer 14 are accommodated in one common tank 15.
  • the inside of the tank 15 is filled with an in-tank medium 5 that is an insulating medium such as insulating oil or gas so as to ensure electrical insulation with respect to the tank 15 such as the switching switch 12 and the pulse transformer 14. .
  • hatching of the tank medium 5 is omitted.
  • the on-load tap switching device 10 may be configured without the tank 15. In this case, the tank medium 4 and the tank medium 5 are common.
  • a high voltage with respect to the ground potential is applied to the switching switch 12 and the gate terminal 1211 of the thyristor 121 from, for example, a tap of the transformer 3.
  • the high voltage with respect to the ground potential is a voltage equal to or higher than the nominal voltage of the transformer 1, for example, a voltage equal to or higher than the withstand voltage of the tap selector 11, a voltage equal to or higher than a voltage at the withstand voltage test of the transformer 1.
  • the voltage during the withstand voltage test of the transformer 1 is defined by JEC-2200 and international standards (IEC60076-3) defined in Japan, and is a voltage several times the nominal voltage of the transformer 1 .
  • the pulse transformer 14 has an insulation performance that can withstand a voltage difference between a high potential on the secondary side and a low potential on the primary side.
  • the control circuit 20 controls the on-load tap switching device 10 according to a change in the voltage on the primary side or the secondary side of the transformer 3, and generates a desired voltage from a plurality of taps. Select a possible tap.
  • the control circuit 20 can correct the voltage variation detected on the primary side or the secondary side of the transformer 3 by this control.
  • FIG. 2 is a configuration diagram illustrating an example of the thyristor driving circuit according to the embodiment.
  • the pulse transformer 14 shown in FIG. 2 is an example in the case of including a pulse transformer main body 141 and a thyristor drive circuit 142.
  • the control circuit 20 sends a control signal to the on-load tap switching device 10 to control the thyristor 121 in the switching switch 12 to either the conduction state or the cutoff state.
  • the control circuit 20 outputs a pulse signal based on an electrical signal as the control signal.
  • the control circuit 20 includes a constant current DC power source 21.
  • the pulse signal supplied from the constant current DC power source 21 is a pulse whose current value is adjusted, and the single pulse may have a rectangular, triangular or sawtooth waveform.
  • the control circuit 20 may supply a constant voltage controlled pulse to the primary side of the pulse transformer main body 141 instead of the pulse whose current value is adjusted.
  • a thyristor 121 is connected to the secondary side of the pulse transformer main body 141 via a thyristor driving circuit 142.
  • the thyristor driving circuit 142 includes resistors (R) 1421 and 1422 and a diode 1423.
  • a signal generated on the secondary side of the pulse transformer main body 141 is divided by the resistors 1421 and 1422 and supplied to the gate of the thyristor 121.
  • the diode 1423 restricts the gate of the thyristor 121 from being reverse-biased.
  • the thyristor 121 includes a pair of thyristor elements and is connected in parallel so that their polarities are reversed.
  • a pulse transformer 14 is provided corresponding to one element of the thyristor 121.
  • the circuit shown in FIG. 2 is an example of a circuit that drives one element of the thyristor 121.
  • the thyristor drive circuit 142 is composed of a combination of passive elements and does not require a power source for operation.
  • the configuration shown in FIG. 2 shows an example of the configuration of the thyristor drive circuit 142, and may include a noise prevention element (passive element) in addition to the passive element shown.
  • the electrical signal supplied to the pulse transformer 14 by the control circuit 20 is a repetitive signal having a sufficiently high frequency with respect to the basic frequency of alternating current transformed by the transformer 3, and is an asynchronous signal with the alternating current transformed by the transformer 3. There may be.
  • an electric signal is supplied from the secondary side of the pulse transformer 14 to the gate of the thyristor 121 while the anode-cathode of the thyristor 121 is biased with a positive voltage, the thyristor 121 becomes conductive. Thereafter, the conduction state is maintained until the anode-cathode of the thyristor 121 is reverse-biased.
  • FIG. 3 is a configuration diagram illustrating an outline of the on-load tap switching device 10 of the transformer device 1 according to the embodiment.
  • the range shown in FIG. 3 exemplifies one phase among the plurality of phases of the transformer 1, and the other phases are configured in the same manner.
  • FIG. 3 shows the transformer 3, the on-load tap switching device 10, and the control circuit 20.
  • the tap winding 3W of the transformer 3 shown in FIG. 3 is provided with adjustment taps T1 to T6.
  • the tap selector 11 selects a pair of adjacent taps from the taps T1 to T6 and connects them to the output side terminals TA and TB, respectively.
  • the tap selector 11 selects any odd-numbered taps such as T1, T3, and T5 as taps connected to the terminal TA, and even-numbers such as T2, T4, and T6 as taps connected to the terminal TB. Select one of the second taps.
  • the switching switch 12 includes a thyristor 121 that functions as a switch.
  • the thyristor 121 includes two systems, an A system and a B system, which form a pair corresponding to the terminal TA and the terminal TB.
  • the A system includes three switches SA, Sa, and Sar and a resistor RA
  • the B system includes three switches Sbr, Sb, and SB and a resistor RB.
  • each of the switches SA, Sa, Sar, and the switches Sbr, Sb, SB includes a pair of thyristor elements and is connected in parallel so that the polarities of the pair of thyristor elements are inverted from each other.
  • the switch SA, the switch Sa, and the switch Sar connected in series with the resistor RA are connected in parallel with each other.
  • the system B is the same as the system A.
  • the output sides (load sides) of the system A and the system B are connected to each other.
  • FIG. 3 it is shown that it is the U phase among the three phases of UVW, and the V phase and the W phase may be similarly configured.
  • control circuit 20 sequentially supplies the pulse transformer 14 with a control signal for switching the switches SA, Sa, Sar and the switches Sbr, Sb, SB in the above order, and the tap to which the system A is connected. Switch from T3 to tap T4 to which system B is connected.
  • the on-load tap switching device 10 can switch to the selected desired tap according to an instruction from the control circuit 20.
  • the switching switch 12 that switches the transformation ratio by switching the connection relationship with the tap selector 11 that includes the thyristor 121 and that is connected to the transformer 3, and the transformer that houses the transformer 3.
  • a pulse transformer 14 that is electrically insulated from the outside of the tank 2 and connected to the control circuit 20 that is insulated from the transformer 3, and mediates a signal from the control circuit 20 to the gate terminal 1211 of the thyristor 121.
  • the on-load tap switching device 10 can control the thyristor 121 (electric trigger type semiconductor switch) with a simpler configuration.
  • the control circuit 20 of the above embodiment transmits a signal (gate signal) that can directly drive the thyristor 121 with an electrical signal without using an optical signal.
  • the on-load tap switching device 10 does not require a device that converts an optical signal into an electrical signal and a power source that supplies power to the device. Thereby, it can avoid that the tap switching apparatus 10 at the time of a load becomes a complicated structure, and can comprise the apparatus at low cost.
  • the pulse transformer 14 is impregnated in the tank medium 4 made of an insulating material, insulation reinforcement at each terminal of the pulse transformer 14 can be omitted, so that the pulse transformer 14 can be reduced in size and cost. is there.
  • the tap switching device 10A of the present embodiment is different from the tap switching device 10 of the first embodiment in the position where the pulse transformer 14 is disposed.
  • FIG. 4 is a configuration diagram of the transformer device 1A including the on-load tap switching device 10A according to the embodiment.
  • symbol is attached
  • the on-load tap switching device 10 ⁇ / b> A includes a tap selector 11, a switching switch 12, a pulse transformer 14 ⁇ / b> A, and a tank 15.
  • the tank 15 is accommodated in the transformer tank 2. At least the switching switch 12 is accommodated in one tank 15.
  • the pulse transformer 14 ⁇ / b> A is accommodated in the transformer tank 2 and disposed outside the tank 15.
  • the pulse transformer 14A insulates between the control circuit 20 and the gate terminal 1211 of the thyristor 121, and can transmit a pulse signal.
  • the side wall 2SW of the transformer tank 2 is provided with a through hole 2H for passing the control line LN1 connecting the control circuit 20 and the pulse transformer 14A.
  • the through hole 2H is blocked so that the medium 4 in the tank does not leak out of the transformer tank 2 from the through hole 2H.
  • the side wall 15SW of the tank 15 is provided with a through hole 15H for passing the control line LN2 connecting the gate terminal 1211 of the thyristor 121 and the pulse transformer 14A.
  • the through hole 15H is closed so that the medium 5 in the tank does not leak from the through hole 15H to the transformer tank 2 side.
  • the on-load tap switching device 10A has the pulse transformer 14A inside the transformer tank 2 so that the pulse transformer 14A It is impregnated in the tank medium 4.
  • the insulation of each terminal of the pulse transformer 14A is enhanced, and the insulation reinforcement of each terminal of the pulse transformer 14A can be omitted, and the pulse transformer 14A can be reduced in size and cost. It is possible.
  • the on-load tap switching device 10B of the present embodiment is different in the structure of the pulse transformer 14B from the structure of the pulse transformer 14 of the first embodiment.
  • FIG. 5 is a configuration diagram of the transformer device 1 including the on-load tap switching device 10B according to the embodiment.
  • symbol is attached
  • the on-load tap switching device 10B includes a tap selector 11, a switching switch 12, a pulse transformer 14B, and a tank 15.
  • the pulse transformer 14B is a mold transformer having an insulating structure 140.
  • the insulating structure 140 may be formed so as to wrap the entire pulse transformer 14B with a coating formed of resin or the like.
  • the on-load tap switching device 10B can collectively mold-insulate all signal lines necessary for controlling the thyristor 121.
  • the pulse transformer 14B has a robust insulation structure. Furthermore, since the pulse transformer 14B is impregnated in the medium 5 in the tank, the insulation reinforcement of each terminal of the pulse transformer 14B can be omitted, and the pulse transformer 14B can be reduced in size and cost. Is possible.
  • the on-load tap switching device 10C of this embodiment is different in the structure of the pulse transformer 14C from the structure of the pulse transformer 14 of the second embodiment.
  • FIG. 6 is a configuration diagram of the transformer device 1 including the on-load tap switching device 10C according to the embodiment.
  • symbol is attached
  • the on-load tap switching device 10 ⁇ / b> C includes a tap selector 11, a switching switch 12, a pulse transformer 14 ⁇ / b> C, and a tank 15.
  • the pulse transformer 14 ⁇ / b> C is a mold transformer having an insulating structure 140.
  • the insulating structure 140 may be formed so as to wrap the entire pulse transformer 14C with a coating formed of resin or the like.
  • the on-load tap switching device 10C can mold-insulate all signal lines necessary for controlling the thyristor 121 at once.
  • the pulse transformer 14C has a mold insulation structure, so that the insulation structure is robust. For this reason, the insulation reinforcement of each terminal of the pulse transformer 14C can be omitted, and the pulse transformer 14C can be reduced in size and cost.
  • the on-load tap switching device 10D of this embodiment is different from the first to fourth embodiments in that a control signal from the control circuit 20 is transmitted as an optical signal via an optical fiber.
  • FIG. 7 is a configuration diagram of a transformer device 1D including the on-load tap switching device 10D according to the embodiment.
  • symbol is attached
  • the transformer device 1 includes a transformer tank 2, a transformer 3, a load tap switching device 10 ⁇ / b> D, an EO conversion circuit 16 (EO), and a control circuit 20.
  • the EO conversion circuit 16 converts a control signal from the control circuit 20 into an optical signal and supplies the optical signal to the optical fiber 30.
  • the EO conversion circuit 16 of the present embodiment is disposed outside the transformer tank 2.
  • the control circuit 20 is connected to the on-load tap switching device 10D via the EO conversion circuit 16 and the optical fiber 30.
  • the EO conversion circuit 16 converts the electric signal supplied from the control circuit 20 into an optical signal, and supplies the optical signal to the on-load tap switching device 10D via the optical fiber 30.
  • the on-load tap switching device 10 ⁇ / b> D includes a tap selector 11, a switching switch 12, an OE conversion circuit 17 (OE), and a tank 15.
  • the OE conversion circuit 17 is an example of an insulation mediation unit.
  • the switching switch 12 and the OE conversion circuit 17 are accommodated in one common tank 15, for example.
  • the inside of the tank 15 is filled with the medium 5 in the tank so as to ensure electrical insulation with respect to the tank 15 such as the switching switch 12 and the OE conversion circuit 17.
  • FIG. 8 is a configuration diagram illustrating an outline of the on-load tap switching device 10D of the transformer device 1 according to the embodiment.
  • FIG. 8 illustrates one of a plurality of phases, and the other phases are the same. A description will be given centering on differences from FIG. 3 described above.
  • the OE conversion circuit 17 converts the optical signal acquired from the outside of its own circuit into an electric signal and drives the thyristor 121.
  • the OE conversion circuit 17 includes a signal conversion unit 171 and a power supply unit 172.
  • the signal conversion unit 171 receives the optical signal transmitted from the EO conversion circuit 16 via the optical fiber 30 and converts it into an electrical signal.
  • the OE conversion circuit 17 is electrically insulated from the outside of the transformer tank 2 of the transformer 3.
  • the OE conversion circuit 17 is insulated from the control circuit 20 by being connected via the optical fiber 30.
  • the OE conversion circuit 17 may detect light output from the optical fiber 30 with a photodiode or a phototransistor, and supply the detected signal to the gate of the thyristor 121. Based on the control signal supplied as described above, the OE conversion circuit 17 controls the thyristor 121 to either the conductive state or the cut-off state.
  • the input side of the power supply unit 172 is connected to a pair of terminals TA and TB of the tap selector 11. That is, the power supply unit 172 is connected to each tap via the terminals TA and TB corresponding to the adjustment tap.
  • the power supply unit 172 has one input terminal connected to the tap T3 via the terminal TA and the other input terminal connected to the tap T4 via the terminal TB.
  • the power supply unit 172 obtains AC power from the pair of taps, and generates power for causing the signal conversion unit 171 to function.
  • the power supply unit 172 generates a direct current of a desired voltage by transforming and rectifying an alternating voltage generated between the pair of taps T3 and T4, and the generated direct-current power is converted into a signal conversion unit.
  • the power supply unit 172 has a dielectric strength with respect to the tank 15 (ground potential).
  • the power supply unit 172 may be provided for each phase, or power may be supplied to the OE conversion circuit 17 for each phase while ensuring insulation between the phases.
  • the OE conversion circuit 17 acquires power for control from the tap winding 3 ⁇ / b> W that is contacted by the tap selector 11. That is, the OE conversion circuit 17 electrically insulates the control circuit 20 outside the transformer tank 2 that houses the transformer 3 from the thyristor 121 and transforms control power for driving the thyristor 121.
  • the signal from the control circuit 20 to the gate terminal 1211 of the thyristor 121 is mediated without being obtained from other than the device 3.
  • the tap selector 11 switches the adjustment tap
  • the input to the power supply unit 172 may be interrupted.
  • the switching switch 12 switches the tap during a period that is not a period during which the tap selector 11 switches the tap.
  • the tap selector 11 and the switching switch 12 have different tap switching timings, even when the power supplied to the power supply unit 172 is interrupted when the tap selector 11 switches the tap, the switching opening / closing is performed. There is no problem in the operation of the device 12.
  • the signal conversion unit 171 receives a control signal from the control circuit 20 and converts it during a period in which power is continuously supplied from the power supply unit 172.
  • the power of the OE conversion circuit 17 can be generated inside the on-load tap switching device 10D without receiving supply of control power from the outside, which is the same as in the first to fourth embodiments. Similarly, a complicated configuration can be avoided and the configuration can be made inexpensively.
  • the on-load tap switching device 10E according to the embodiment will be described. Unlike the fifth embodiment, the on-load tap switching device 10E of the present embodiment is disposed inside the tank 15 of the on-load tap switching device 10E, unlike the fifth embodiment.
  • FIG. 9 is a configuration diagram of the transformer device 1 including the on-load tap switching device 10E according to the embodiment.
  • symbol is attached
  • the control circuit 20 is connected to the on-load tap switching device 10E by the control line LN.
  • the on-load tap switching device 10E includes a tap selector 11, a switching switch 12, a tank 15, an EO conversion circuit 16E, and an OE conversion circuit 17E.
  • the EO conversion circuit 16E and the OE conversion circuit 17E correspond to the EO conversion circuit 16 and the OE conversion circuit 17 described above. Hereinafter, it demonstrates centering around difference with them.
  • the switching switch 12, the EO conversion circuit 16E, and the OE conversion circuit 17E are accommodated in one tank 15.
  • the inside of the tank 15 is filled with the medium 5 in the tank so that electrical insulation with respect to the tank 15 and the EO conversion circuit 16E, such as the switching switch 12 and the OE conversion circuit 17E, is ensured.
  • the EO conversion circuit 16E converts the electrical signal supplied from the control circuit 20 into an optical signal and outputs it.
  • the OE conversion circuit 17E will be described with reference to FIG.
  • the OE conversion circuit 17E includes a signal conversion unit 171E and a power supply unit 172.
  • the signal conversion unit 171E receives the optical signal transmitted from the EO conversion circuit 16 and converts it into an electrical signal.
  • the OE conversion circuit 17E is paired with the EO conversion circuit 16E to form an optical coupler.
  • the EO conversion circuit 16E and the OE conversion circuit 17E are arranged at a predetermined interval determined from the withstand voltage, and electrical insulation is ensured.
  • the medium (not shown) that transmits light from the EO conversion circuit 16E to the OE conversion circuit 17E may be the medium 5 in the tank or another medium that transmits light.
  • the power of the OE conversion circuit 17E is generated inside the on-load tap switching device 10E without receiving the supply of control power from the outside, so that the complex as in the fifth embodiment. It can be configured at low cost. Furthermore, according to the present embodiment, it can be realized without using the optical fiber 30.
  • the switching switch includes a semiconductor switch, and switches the transformation ratio by switching the connection relationship with the tap selector connected to the transformer.
  • the insulation intermediary unit electrically insulates the semiconductor switch from the control circuit outside the transformer tank housing unit that houses the transformer, and mediates a signal from the control circuit to the gate terminal of the semiconductor switch. To do.
  • the pulse transformer 14 and the OE conversion circuit 17 are an example of an insulation mediating unit.

Abstract

An on-load tap switching device according to an aspect of the present invention has a changeover switch and an insulating mediator. The changeover switch includes a semiconductor switch, and shifts the transformation ratio by switching the connection relationship with respect to a tap selector connected to a transformer. The insulating mediator electrically insulates the semiconductor switch from a control circuit located outside a transformer storage part that stores the transformer, and mediates a signal from the control circuit to a gate terminal of the semiconductor switch.

Description

負荷時タップ切換装置Load tap changer
　本発明の実施形態は、負荷時タップ切換装置に関する。 The embodiment of the present invention relates to an on-load tap switching device.
　負荷に電力を供給する変圧器において、電力を供給中にその変圧比を切換える負荷時タップ切換装置が知られている。負荷時タップ切換装置は、変圧器に設けられている電圧調整用のタップを切換開閉器によって切換える。負荷時タップ切換装置には、半導体スイッチ（半導体素子）を用いる切換開閉器がある。切換開閉器の半導体スイッチは、切換開閉器の外部にある制御回路から、その導通状態を制御するための制御信号が供給される。 2. Description of the Related Art A load tap switching device that switches a transformation ratio during power supply in a transformer that supplies power to a load is known. The on-load tap switching device switches a voltage adjustment tap provided on the transformer by a switching switch. The on-load tap switching device includes a switching switch using a semiconductor switch (semiconductor element). The semiconductor switch of the switching switch is supplied with a control signal for controlling the conduction state from a control circuit outside the switching switch.
　負荷時タップ切換装置には、試験時等に高電圧が印加される。負荷時タップ切換装置と制御回路は、その高電圧に耐えなければならない。制御回路から光信号で制御信号を伝送することにより、負荷時タップ切換装置に印加される高電圧に対する絶縁耐圧を確保する方法が知られている。ただし、この方法を半導体スイッチで実現するには、光トリガ式の半導体スイッチを用いるか、電気トリガ式の半導体スイッチを用いて、電気トリガ式の半導体スイッチ近傍に光信号を電気信号に変換するゲート駆動回路を設けるかの方法がある。上記の何れの場合も、外部からゲート駆動回路に電力を供給する電源などが必要であり、負荷時タップ切換装置の構成が複雑になる。 高 High voltage is applied to the tap changer when loaded during testing. The on-load tap changer and the control circuit must withstand the high voltage. There is known a method for ensuring a dielectric strength voltage against a high voltage applied to a load tap changer by transmitting a control signal as an optical signal from a control circuit. However, in order to realize this method with a semiconductor switch, an optical trigger type semiconductor switch is used, or an electrical trigger type semiconductor switch is used to convert an optical signal into an electrical signal in the vicinity of the electric trigger type semiconductor switch. There is a method of providing a drive circuit. In any of the above cases, a power source for supplying power to the gate drive circuit from the outside is necessary, and the configuration of the on-load tap switching device becomes complicated.
日本国特表２０１２－５０１０６９号公報Japan Special Table of Contents 2012-501069 日本国特表２０１３－５２０８０９号公報Japanese National Table 2013-520809 日本国特表２０１２－５２３６８１号公報Japanese National Special Table 2012-52381 日本国特表２０１５－５１１０３４号公報Japan Special Table 2015-511034 日本国特許２５２１２５０号公報Japanese Patent No. 2521250 日本国特表２０１４－５０１４４１号公報Japan Special Table 2014-14501441 日本国特許２６６２４３４号公報Japanese Patent No. 2664434
　本発明が解決しようとする課題は、切換開閉器に電気トリガ式の半導体スイッチを含む負荷時タップ切換装置を、より簡素な構成で提供することである。 The problem to be solved by the present invention is to provide an on-load tap switching device including an electric trigger type semiconductor switch in a switching switch with a simpler configuration.
　実施形態の一態様の負荷時タップ切換装置は、切換開閉器と、絶縁仲介部と、を持つ。切換開閉器は、半導体スイッチを含み、変圧器に接続されたタップ選択器との接続関係を切り換えることで変圧比を切換える。絶縁仲介部は、前記変圧器を収容する変圧器収容部の外部にある制御回路と前記半導体スイッチとを電気的に絶縁すると共に、前記制御回路から前記半導体スイッチのゲート端子への信号を仲介する。 The on-load tap switching device according to one aspect of the embodiment includes a switching switch and an insulation mediating unit. The switching switch includes a semiconductor switch, and switches the transformation ratio by switching the connection relationship with the tap selector connected to the transformer. The insulation mediating unit electrically insulates the semiconductor switch from the control circuit outside the transformer housing unit that houses the transformer, and mediates a signal from the control circuit to the gate terminal of the semiconductor switch. .
実施形態に係る負荷時タップ切換装置１０を含む変圧装置１の構成図。1 is a configuration diagram of a transformer device 1 including a load tap switching device 10 according to an embodiment. 実施形態のサイリスタ駆動回路の一例を示す構成図。The block diagram which shows an example of the thyristor drive circuit of embodiment. 実施形態の変圧装置１の負荷時タップ切換装置１０の概要を示す構成図。The block diagram which shows the outline | summary of the tap switching apparatus 10 at the time of the transformer device 1 of embodiment. 第２の実施形態に係る負荷時タップ切換装置１０Ａを含む変圧装置１Ａの構成図。The block diagram of 1 A of transformers containing the tap switching apparatus 10A at the time of load which concerns on 2nd Embodiment. 第３の実施形態に係る負荷時タップ切換装置１０Ｂを含む変圧装置１Ｂの構成図。The block diagram of the transformer 1B containing the tap change apparatus 10B at the time of load which concerns on 3rd Embodiment. 第４の実施形態に係る負荷時タップ切換装置１０Ｃを含む変圧装置１Ｃの構成図。The block diagram of 1 C of transformers containing 10 C of on-load tap switching apparatuses which concern on 4th Embodiment. 第５の実施形態に係る負荷時タップ切換装置１０Ｄを含む変圧装置１Ｄの構成図。The lineblock diagram of transformer 1D containing tap change device 10D at the time of a load concerning a 5th embodiment. 実施形態の変圧装置１Ｄの負荷時タップ切換装置１０Ｄの概要を示す構成図。The block diagram which shows the outline | summary of the tap switching apparatus 10D at the time of the transformer apparatus 1D of embodiment. 第６の実施形態に係る負荷時タップ切換装置１０Ｅを含む変圧装置１Ｅの構成図。The block diagram of the transformer 1E containing the tap change apparatus 10E at the time of load which concerns on 6th Embodiment.
　以下、実施形態のタップ切換装置を、図面を参照して説明する。 Hereinafter, the tap switching device of the embodiment will be described with reference to the drawings.
（第１の実施形態）
　図１は、実施形態に係る負荷時タップ切換装置１０を含む変圧装置１の構成図である。変圧装置１は、変圧器タンク２（変圧器収容部）と、変圧器３と、負荷時タップ切換装置１０（タップ切換装置）と、制御回路２０とを備える。 (First embodiment)
FIG. 1 is a configuration diagram of a transformer 1 including a load tap switching device 10 according to an embodiment. The transformer device 1 includes a transformer tank 2 (transformer housing portion), a transformer 3, a load tap switching device 10 (tap switching device), and a control circuit 20.
　変圧器タンク２は、変圧器３、負荷時タップ切換装置１０等を収容する。例えば、変圧器タンク２の内部は、絶縁油又はガスなどのタンク内媒体４が満たされていている。これによって、負荷時タップ切換装置１０と変圧器３の巻線等との電気的な絶縁性が確保される。各図においてタンク内媒体４のハッチングを省略する。 The transformer tank 2 accommodates the transformer 3, the on-load tap switching device 10 and the like. For example, the inside of the transformer tank 2 is filled with an in-tank medium 4 such as insulating oil or gas. Thus, electrical insulation between the on-load tap switching device 10 and the windings of the transformer 3 is ensured. In each figure, the hatching of the tank medium 4 is omitted.
　変圧器３は、巻線と、巻線に取り付けられた電圧調整用の複数のタップとを備える。複数のタップは、負荷時タップ切換装置１０にそれぞれ接続される。なお、変圧器３では、電圧調整用の巻線が主たる巻線から分岐して形成されていてもよい。 The transformer 3 includes a winding and a plurality of taps for voltage adjustment attached to the winding. The plurality of taps are connected to the on-load tap switching device 10, respectively. In the transformer 3, the voltage adjustment winding may be branched from the main winding.
　制御回路２０は、例えば、変圧器タンク２の外に設置される。制御回路２０は、負荷時タップ切換装置１０に制御信号を供給することにより、変圧装置１における変圧比を切換える。 The control circuit 20 is installed outside the transformer tank 2, for example. The control circuit 20 switches the transformation ratio in the transformer 1 by supplying a control signal to the on-load tap switching device 10.
　負荷時タップ切換装置１０は、タップ選択器１１と、切換開閉器１２と、パルストランス１４と、槽１５とを備える。パルストランス１４は、絶縁仲介部の一例である。 The on-load tap switching device 10 includes a tap selector 11, a switching switch 12, a pulse transformer 14, and a tank 15. The pulse transformer 14 is an example of an insulation mediator.
　タップ選択器１１は、変圧器３の１つの巻線に設けられた１対のタップを選択する。例えば、上記の１対のタップは、変圧器３の電圧調整用の複数のタップのうち互いに隣接するものである。タップ選択器１１は、選択された１対のタップに、対となる接触子をそれぞれ接触させる。タップ選択器１１の対となる接触子の一方が導通状態であり、他方が非導通状態である。タップ選択器１１は、導通状態でない接触子を、選択すべきタップにアーム等で移動させて、そのタップに接触させることにより、切換開閉器１２がタップを切換えるための前処理をする。 The tap selector 11 selects a pair of taps provided in one winding of the transformer 3. For example, the pair of taps are adjacent to each other among the plurality of taps for voltage adjustment of the transformer 3. The tap selector 11 brings the pair of contacts into contact with the selected pair of taps. One of the contacts that are paired with the tap selector 11 is in a conductive state, and the other is in a non-conductive state. The tap selector 11 performs preprocessing for the switching switch 12 to switch taps by moving a contact that is not in a conductive state to a tap to be selected by an arm or the like and bringing it into contact with the tap.
　切換開閉器１２は、変圧器３に接続されたタップ選択器１１との接続関係を切り換えることで変圧比を切換える。例えば、切換開閉器１２は、タップ選択器１１が所望のタップに接触子を接触させた後に、制御回路２０により制御され、有効タップの切換を実施する。タップ選択器１１と切換開閉器１２が連携することにより、負荷（不図示）が接続される回路を遮断することなく変圧装置１における変圧比を切換えることができる。 The switching switch 12 switches the transformation ratio by switching the connection relationship with the tap selector 11 connected to the transformer 3. For example, the switching switch 12 is controlled by the control circuit 20 after the tap selector 11 brings a contact into contact with a desired tap, and switches the effective tap. By cooperating the tap selector 11 and the switching switch 12, it is possible to switch the transformation ratio in the transformer 1 without interrupting the circuit to which the load (not shown) is connected.
　切換開閉器１２の内部には、有効タップの切換を実施するための電気トリガ型のサイリスタ１２１が組み込まれている。サイリスタ１２１は、制御信号が入力されるゲート端子１２１１を備える。ゲート端子１２１１は、例えば、モールド形成されたサイリスタ１２１の表面に配置される。ゲート端子１２１１には結線用のケーブルがネジなどにより固定される。制御回路２０は、切換開閉器１２におけるサイリスタ１２１の導通状態を切換えることで、変圧装置１における変圧比を切換える。なお、サイリスタ１２１は、半導体スイッチの一例である。例えば、サイリスタ１２１を、ＭＯＳＦＥＴ（Metal Oxide Semiconductor Field Effect Transistor）、ＩＧＢＴ（Insulated Gate Bipolar Transistor）などに代えてもよい。 In the switching switch 12, an electric trigger type thyristor 121 for switching the effective tap is incorporated. The thyristor 121 includes a gate terminal 1211 to which a control signal is input. The gate terminal 1211 is disposed on the surface of the thyristor 121 that is molded, for example. A cable for connection is fixed to the gate terminal 1211 with a screw or the like. The control circuit 20 switches the transformation ratio in the transformer 1 by switching the conduction state of the thyristor 121 in the switching switch 12. The thyristor 121 is an example of a semiconductor switch. For example, the thyristor 121 may be replaced with a MOSFET (Metal / Oxide / Semiconductor / Field / Effect / Transistor), IGBT (Insulated / Gate / Bipolar / Transistor), or the like.
　パルストランス１４は、制御回路２０と切換開閉器１２との間の電磁的な接続を形成する。パルストランス１４の２次側には、サイリスタ１２１上のゲート端子１２１１が接続される。パルストランス１４は、サイリスタ１２１を制御するための電力を得ることなく、制御回路２０からサイリスタ１２１上のゲート端子１２１１への信号を仲介する。それと共に、パルストランス１４は、変圧器３の変圧器タンク２の外部にある制御回路２０とサイリスタ１２１とを電気的に絶縁する。例えば、パルストランス１４は、負荷時タップ切換装置１０の内部に設置され、槽内媒体５の中に含浸されている。これにより、パルストランス１４単体の絶縁耐圧よりも、絶縁性を高めることができる。例えば、対地電位に対するパルストランス１４の絶縁耐圧及びパルストランス１４の巻線間の絶縁耐圧は、対地電位に対するタップ選択器１１の絶縁耐圧より高くなっている。これにより、切換開閉器１２側の高電圧によって、制御回路２０が損傷することの抑制が可能である。 The pulse transformer 14 forms an electromagnetic connection between the control circuit 20 and the switching switch 12. A gate terminal 1211 on the thyristor 121 is connected to the secondary side of the pulse transformer 14. The pulse transformer 14 mediates a signal from the control circuit 20 to the gate terminal 1211 on the thyristor 121 without obtaining electric power for controlling the thyristor 121. At the same time, the pulse transformer 14 electrically insulates the control circuit 20 and the thyristor 121 outside the transformer tank 2 of the transformer 3. For example, the pulse transformer 14 is installed inside the on-load tap changer 10 and is impregnated in the medium 5 in the tank. Thereby, insulation can be improved rather than the withstand voltage of the pulse transformer 14 single-piece | unit. For example, the withstand voltage of the pulse transformer 14 with respect to the ground potential and the withstand voltage between the windings of the pulse transformer 14 are higher than the withstand voltage of the tap selector 11 with respect to the ground potential. Thereby, it is possible to suppress the control circuit 20 from being damaged by the high voltage on the switching switch 12 side.
　槽１５は、変圧器タンク２に収容される。少なくとも切換開閉器１２が一つの槽１５に収容されている。例えば、切換開閉器１２とパルストランス１４は、共通の一つの槽１５に収容されている。槽１５の内部は、切換開閉器１２とパルストランス１４等の槽１５に対する電気的な絶縁性が確保されるように、絶縁油又はガスなどの絶縁媒体である槽内媒体５が満たされている。各図において槽内媒体５のハッチングを省略する。
　なお、負荷時タップ切換装置１０は、槽１５を持たずに構成されてもよい。この場合、タンク内媒体４と槽内媒体５とは共通になる。 The tank 15 is accommodated in the transformer tank 2. At least the switching switch 12 is accommodated in one tank 15. For example, the switching switch 12 and the pulse transformer 14 are accommodated in one common tank 15. The inside of the tank 15 is filled with an in-tank medium 5 that is an insulating medium such as insulating oil or gas so as to ensure electrical insulation with respect to the tank 15 such as the switching switch 12 and the pulse transformer 14. . In each figure, hatching of the tank medium 5 is omitted.
The on-load tap switching device 10 may be configured without the tank 15. In this case, the tank medium 4 and the tank medium 5 are common.
　なお、本実施形態において、切換開閉器１２及びサイリスタ１２１のゲート端子１２１１には、例えば、変圧器３のタップから接地電位に対する高電圧が印加される。接地電位に対する高電圧とは、変圧装置１の公称電圧以上の電圧、例えば、タップ選択器１１の絶縁耐圧以上の電圧、変圧装置１の絶縁耐圧試験時の電圧以上の電圧等である。例えば、変圧装置１の絶縁耐圧試験時の電圧は、日本国内で規定されているＪＥＣ－２２００や国際規格（ＩＥＣ６００７６－３）等で規定され、変圧装置１の公称電圧の数倍の電圧である。上記の通り、パルストランス１４の２次側には、接地電位に対する高電圧が印加される。それに対し、パルストランス１４の１次側には、接地電位に対する低電位が印加される。一次側に印加される低電位は、２次側に印加される高電位に対して十分に低い電位である。このため、パルストランス１４は、２次側の高電位と１次側の低電位との電圧差に耐え得る絶縁性能を有する。 In the present embodiment, a high voltage with respect to the ground potential is applied to the switching switch 12 and the gate terminal 1211 of the thyristor 121 from, for example, a tap of the transformer 3. The high voltage with respect to the ground potential is a voltage equal to or higher than the nominal voltage of the transformer 1, for example, a voltage equal to or higher than the withstand voltage of the tap selector 11, a voltage equal to or higher than a voltage at the withstand voltage test of the transformer 1. For example, the voltage during the withstand voltage test of the transformer 1 is defined by JEC-2200 and international standards (IEC60076-3) defined in Japan, and is a voltage several times the nominal voltage of the transformer 1 . As described above, a high voltage with respect to the ground potential is applied to the secondary side of the pulse transformer 14. On the other hand, a low potential with respect to the ground potential is applied to the primary side of the pulse transformer 14. The low potential applied to the primary side is sufficiently lower than the high potential applied to the secondary side. For this reason, the pulse transformer 14 has an insulation performance that can withstand a voltage difference between a high potential on the secondary side and a low potential on the primary side.
　変圧装置１において、制御回路２０は、変圧器３の１次側又は２次側の電圧の変化に応じて負荷時タップ切換装置１０を制御して、複数のタップのうちから所望の電圧を生成可能なタップを選択する。制御回路２０は、この制御により、変圧器３の１次側又は２次側で検出された電圧変動の補正が可能である。 In the transformer device 1, the control circuit 20 controls the on-load tap switching device 10 according to a change in the voltage on the primary side or the secondary side of the transformer 3, and generates a desired voltage from a plurality of taps. Select a possible tap. The control circuit 20 can correct the voltage variation detected on the primary side or the secondary side of the transformer 3 by this control.
　図２は、実施形態のサイリスタ駆動回路の一例を示す構成図である。図２に示すパルストランス１４は、パルストランス本体１４１とサイリスタ駆動回路１４２を含む場合の一例である。 FIG. 2 is a configuration diagram illustrating an example of the thyristor driving circuit according to the embodiment. The pulse transformer 14 shown in FIG. 2 is an example in the case of including a pulse transformer main body 141 and a thyristor drive circuit 142.
　制御回路２０は、負荷時タップ切換装置１０に対して、制御信号を送り、切換開閉器１２内のサイリスタ１２１を導通状態と遮断状態とのいずれかに制御する。例えば、制御回路２０は、制御信号として、電気信号によるパルス信号を出力する。制御回路２０は、定電流直流電源２１を備える。定電流直流電源２１が供給するパルス信号は、電流値が調整されたパルスであり、その単一パルスは矩形、三角又は鋸状の波形を有するものであってもよい。なお、制御回路２０は、電流値が調整されたパルスに代えて、定電圧制御されたパルスを、パルストランス本体１４１の１次側に供給してもよい。 The control circuit 20 sends a control signal to the on-load tap switching device 10 to control the thyristor 121 in the switching switch 12 to either the conduction state or the cutoff state. For example, the control circuit 20 outputs a pulse signal based on an electrical signal as the control signal. The control circuit 20 includes a constant current DC power source 21. The pulse signal supplied from the constant current DC power source 21 is a pulse whose current value is adjusted, and the single pulse may have a rectangular, triangular or sawtooth waveform. The control circuit 20 may supply a constant voltage controlled pulse to the primary side of the pulse transformer main body 141 instead of the pulse whose current value is adjusted.
　定電流直流電源２１がパルストランス本体１４１の１次側にパルス信号を供給することで、そのパルス信号に対応する信号がパルストランス本体１４１の２次側に発生する。 When the constant current DC power supply 21 supplies a pulse signal to the primary side of the pulse transformer main body 141, a signal corresponding to the pulse signal is generated on the secondary side of the pulse transformer main body 141.
　パルストランス本体１４１の２次側には、サイリスタ駆動回路１４２を介してサイリスタ１２１が接続される。例えば、サイリスタ駆動回路１４２は、抵抗（Ｒ）１４２１、１４２２と、ダイオード１４２３を含む。パルストランス本体１４１の２次側に発生した信号が、抵抗１４２１と抵抗１４２２とにより分圧されてサイリスタ１２１のゲートに供給される。なお、ダイオード１４２３は、サイリスタ１２１のゲートが逆バイアスされることを制限する。 A thyristor 121 is connected to the secondary side of the pulse transformer main body 141 via a thyristor driving circuit 142. For example, the thyristor driving circuit 142 includes resistors (R) 1421 and 1422 and a diode 1423. A signal generated on the secondary side of the pulse transformer main body 141 is divided by the resistors 1421 and 1422 and supplied to the gate of the thyristor 121. Note that the diode 1423 restricts the gate of the thyristor 121 from being reverse-biased.
　サイリスタ１２１は、組を成すサイリスタ素子を含み、互いに極性が反転するように並列に接続される。なお、サイリスタ１２１の１つの素子に対応させて、パルストランス１４が設けられている。図２に示す回路は、サイリスタ１２１の１つの素子を駆動する回路の一例である。 The thyristor 121 includes a pair of thyristor elements and is connected in parallel so that their polarities are reversed. A pulse transformer 14 is provided corresponding to one element of the thyristor 121. The circuit shown in FIG. 2 is an example of a circuit that drives one element of the thyristor 121.
　上記の通り、サイリスタ駆動回路１４２は、受動素子の組み合わせで構成されており、動作に電源を必要としない。なお、図２に示す構成は、サイリスタ駆動回路１４２の構成の一例を示すものであり、図示する受動素子の他にノイズ防止用の素子（受動素子）などを含めてもよい。 As described above, the thyristor drive circuit 142 is composed of a combination of passive elements and does not require a power source for operation. The configuration shown in FIG. 2 shows an example of the configuration of the thyristor drive circuit 142, and may include a noise prevention element (passive element) in addition to the passive element shown.
　制御回路２０がパルストランス１４に供給する電気信号は、変圧器３が変圧する交流の基本周波数に対して十分に高い周波数の繰り返し信号であって、変圧器３が変圧する交流と非同期の信号であってもよい。サイリスタ１２１のアノード－カソード間が正の電圧によりバイアスされた状態で、パルストランス１４の２次側からサイリスタ１２１のゲートに電気信号が供給されると、サイリスタ１２１が導通状態になる。それ以降、サイリスタ１２１のアノード－カソード間が逆バイアスになるまで、導通状態が維持される。 The electrical signal supplied to the pulse transformer 14 by the control circuit 20 is a repetitive signal having a sufficiently high frequency with respect to the basic frequency of alternating current transformed by the transformer 3, and is an asynchronous signal with the alternating current transformed by the transformer 3. There may be. When an electric signal is supplied from the secondary side of the pulse transformer 14 to the gate of the thyristor 121 while the anode-cathode of the thyristor 121 is biased with a positive voltage, the thyristor 121 becomes conductive. Thereafter, the conduction state is maintained until the anode-cathode of the thyristor 121 is reverse-biased.
　図３は、実施形態の変圧装置１の負荷時タップ切換装置１０の概要を示す構成図である。図３に示す範囲は、変圧装置１の複数の相のうちの１相を例示するものであり、他の相も同様に構成する。図３には、変圧器３と、負荷時タップ切換装置１０と、制御回路２０とが記載されている。図３に示す変圧器３のタップ巻線３Ｗには、調整用のタップＴ１からＴ６が設けられている。タップ選択器１１は、タップＴ１からＴ６のうち隣接する１対のタップを選択し、出力側の端子ＴＡとＴＢにそれぞれ接続する。タップ選択器１１は、端子ＴＡに接続するタップとして、Ｔ１、Ｔ３、Ｔ５のように奇数番目のタップのいずれかを選択し、端子ＴＢに接続するタップとして、Ｔ２、Ｔ４、Ｔ６のように偶数番目のタップのいずれかを選択する。 FIG. 3 is a configuration diagram illustrating an outline of the on-load tap switching device 10 of the transformer device 1 according to the embodiment. The range shown in FIG. 3 exemplifies one phase among the plurality of phases of the transformer 1, and the other phases are configured in the same manner. FIG. 3 shows the transformer 3, the on-load tap switching device 10, and the control circuit 20. The tap winding 3W of the transformer 3 shown in FIG. 3 is provided with adjustment taps T1 to T6. The tap selector 11 selects a pair of adjacent taps from the taps T1 to T6 and connects them to the output side terminals TA and TB, respectively. The tap selector 11 selects any odd-numbered taps such as T1, T3, and T5 as taps connected to the terminal TA, and even-numbers such as T2, T4, and T6 as taps connected to the terminal TB. Select one of the second taps.
　切換開閉器１２は、スイッチとして機能するサイリスタ１２１を含む。サイリスタ１２１は、上記の端子ＴＡと端子ＴＢとに対応する対をなすＡ系とＢ系の２系統が含まれている。Ａ系には、スイッチＳＡ、Ｓａ、Ｓａｒの３個と抵抗ＲＡが含まれ、Ｂ系には、スイッチＳｂｒ、Ｓｂ、ＳＢの３個と抵抗ＲＢが含まれる。例えば、スイッチＳＡ、Ｓａ、Ｓａｒ、及び、スイッチＳｂｒ、Ｓｂ、ＳＢのそれぞれが、１対のサイリスタ素子を含み、１対のサイリスタ素子の極性が互いに反転するように並列に接続されている。スイッチＳＡと、スイッチＳａと、抵抗ＲＡと直列に接続されたスイッチＳａｒは、それぞれが互いに並列になるように接続される。系統Ｂについても、系統Ａと同様である。系統Ａと系統Ｂのそれぞれの出力側（負荷側）は、互いに接続される。図３に示す例では、ＵＶＷの３相のうちＵ相であることを示しており、Ｖ相、Ｗ相についても同様に構成されてよい。 The switching switch 12 includes a thyristor 121 that functions as a switch. The thyristor 121 includes two systems, an A system and a B system, which form a pair corresponding to the terminal TA and the terminal TB. The A system includes three switches SA, Sa, and Sar and a resistor RA, and the B system includes three switches Sbr, Sb, and SB and a resistor RB. For example, each of the switches SA, Sa, Sar, and the switches Sbr, Sb, SB includes a pair of thyristor elements and is connected in parallel so that the polarities of the pair of thyristor elements are inverted from each other. The switch SA, the switch Sa, and the switch Sar connected in series with the resistor RA are connected in parallel with each other. The system B is the same as the system A. The output sides (load sides) of the system A and the system B are connected to each other. In the example shown in FIG. 3, it is shown that it is the U phase among the three phases of UVW, and the V phase and the W phase may be similarly configured.
　例えば、制御回路２０は、スイッチＳＡ、Ｓａ、Ｓａｒと、スイッチＳｂｒ、Ｓｂ、ＳＢとを、上記の順に切り換えるような制御信号をパルストランス１４に順次供給して、系統Ａが接続されているタップＴ３から系統Ｂが接続されているタップＴ４に切り換える。 For example, the control circuit 20 sequentially supplies the pulse transformer 14 with a control signal for switching the switches SA, Sa, Sar and the switches Sbr, Sb, SB in the above order, and the tap to which the system A is connected. Switch from T3 to tap T4 to which system B is connected.
　これによって、負荷時タップ切換装置１０は、制御回路２０からの指示によって、選択された所望のタップに切り換えることができる。 Thereby, the on-load tap switching device 10 can switch to the selected desired tap according to an instruction from the control circuit 20.
　上記の実施形態によれば、サイリスタ１２１を含み、変圧器３に接続されたタップ選択器１１との接続関係を切り換えることで変圧比を切換える切換開閉器１２と、変圧器３を収容する変圧器タンク２の外部から電気的に絶縁され、変圧器３から絶縁された制御回路２０に接続され、制御回路２０からサイリスタ１２１のゲート端子１２１１への信号を仲介するパルストランス１４と、を備えることにより、負荷時タップ切換装置１０は、より簡素な構成でサイリスタ１２１（電気トリガ式の半導体スイッチ）を制御することができる。 According to the above embodiment, the switching switch 12 that switches the transformation ratio by switching the connection relationship with the tap selector 11 that includes the thyristor 121 and that is connected to the transformer 3, and the transformer that houses the transformer 3. A pulse transformer 14 that is electrically insulated from the outside of the tank 2 and connected to the control circuit 20 that is insulated from the transformer 3, and mediates a signal from the control circuit 20 to the gate terminal 1211 of the thyristor 121. The on-load tap switching device 10 can control the thyristor 121 (electric trigger type semiconductor switch) with a simpler configuration.
　上記の実施形態の制御回路２０は、光信号を利用せずに、電気信号でサイリスタ１２１を直接駆動可能な信号（ゲート信号）を伝送する。これにより、負荷時タップ切換装置１０では、光信号から電気信号に変換する装置及びその装置に電力を供給する電源が不要である。これにより、負荷時タップ切換装置１０が複雑な構成になることを避け、同装置を安価に構成できる。
　また、パルストランス１４は、絶縁物のタンク内媒体４の中に含浸されているため、パルストランス１４の各端子の絶縁補強を省略できることから、パルストランス１４の小型化および省コスト化が可能である。 The control circuit 20 of the above embodiment transmits a signal (gate signal) that can directly drive the thyristor 121 with an electrical signal without using an optical signal. As a result, the on-load tap switching device 10 does not require a device that converts an optical signal into an electrical signal and a power source that supplies power to the device. Thereby, it can avoid that the tap switching apparatus 10 at the time of a load becomes a complicated structure, and can comprise the apparatus at low cost.
Further, since the pulse transformer 14 is impregnated in the tank medium 4 made of an insulating material, insulation reinforcement at each terminal of the pulse transformer 14 can be omitted, so that the pulse transformer 14 can be reduced in size and cost. is there.
（第２の実施形態）
　次に、実施形態に係る負荷時タップ切換装置１０Ａについて説明する。本実施形態のタップ切換装置１０Ａは、パルストランス１４の配置される位置が第１の実施形態のタップ切換装置１０とは異なるものである。 (Second Embodiment)
Next, the on-load tap switching device 10A according to the embodiment will be described. The tap switching device 10A of the present embodiment is different from the tap switching device 10 of the first embodiment in the position where the pulse transformer 14 is disposed.
　図４は、実施形態に係る負荷時タップ切換装置１０Ａを含む変圧装置１Ａの構成図である。なお、第１の実施形態と同一の構成には同一の符号を付し、重複する説明は省略する。 FIG. 4 is a configuration diagram of the transformer device 1A including the on-load tap switching device 10A according to the embodiment. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted.
　負荷時タップ切換装置１０Ａは、タップ選択器１１と、切換開閉器１２と、パルストランス１４Ａと、槽１５とを備える。 The on-load tap switching device 10 </ b> A includes a tap selector 11, a switching switch 12, a pulse transformer 14 </ b> A, and a tank 15.
　槽１５は、変圧器タンク２に収容される。少なくとも切換開閉器１２が一つの槽１５に収容されている。パルストランス１４Ａは、変圧器タンク２に収容され且つ槽１５の外に配置される。パルストランス１４Ａは、制御回路２０とサイリスタ１２１のゲート端子１２１１との間を絶縁し、パルス信号の伝送が可能である。 The tank 15 is accommodated in the transformer tank 2. At least the switching switch 12 is accommodated in one tank 15. The pulse transformer 14 </ b> A is accommodated in the transformer tank 2 and disposed outside the tank 15. The pulse transformer 14A insulates between the control circuit 20 and the gate terminal 1211 of the thyristor 121, and can transmit a pulse signal.
　例えば、変圧器タンク２の側壁２ＳＷには、制御回路２０とパルストランス１４Ａとを繋ぐ制御線ＬＮ１を通線するための貫通穴２Ｈが設けられている。貫通穴２Ｈは、タンク内媒体４が貫通穴２Ｈから変圧器タンク２の外に漏れないように閉塞されている。 For example, the side wall 2SW of the transformer tank 2 is provided with a through hole 2H for passing the control line LN1 connecting the control circuit 20 and the pulse transformer 14A. The through hole 2H is blocked so that the medium 4 in the tank does not leak out of the transformer tank 2 from the through hole 2H.
　また、槽１５の側壁１５ＳＷには、サイリスタ１２１のゲート端子１２１１とパルストランス１４Ａとを繋ぐ制御線ＬＮ２を通線するための貫通穴１５Ｈが設けられている。貫通穴１５Ｈは、槽内媒体５が変圧器タンク２側に貫通穴１５Ｈから漏れないように閉塞されている。 Further, the side wall 15SW of the tank 15 is provided with a through hole 15H for passing the control line LN2 connecting the gate terminal 1211 of the thyristor 121 and the pulse transformer 14A. The through hole 15H is closed so that the medium 5 in the tank does not leak from the through hole 15H to the transformer tank 2 side.
　上記の実施形態によれば、第１の実施形態と同様の効果を奏することの他、負荷時タップ切換装置１０Ａは、パルストランス１４Ａを変圧器タンク２の内部に持つことにより、パルストランス１４Ａがタンク内媒体４の中に含浸される。上記のように構成したことにより、パルストランス１４Ａの各端子の絶縁性が高まり、パルストランス１４Ａの各端子の絶縁補強を省略することができ、パルストランス１４Ａの小型化と省コスト化を実現することが可能である。 According to the above embodiment, in addition to the same effects as those of the first embodiment, the on-load tap switching device 10A has the pulse transformer 14A inside the transformer tank 2 so that the pulse transformer 14A It is impregnated in the tank medium 4. By configuring as described above, the insulation of each terminal of the pulse transformer 14A is enhanced, and the insulation reinforcement of each terminal of the pulse transformer 14A can be omitted, and the pulse transformer 14A can be reduced in size and cost. It is possible.
（第３の実施形態）
　次に、実施形態に係る負荷時タップ切換装置１０Ｂについて説明する。本実施形態の負荷時タップ切換装置１０Ｂは、パルストランス１４Ｂの構造が第１の実施形態のパルストランス１４の構造とは異なるものである。 (Third embodiment)
Next, the on-load tap switching device 10B according to the embodiment will be described. The on-load tap switching device 10B of the present embodiment is different in the structure of the pulse transformer 14B from the structure of the pulse transformer 14 of the first embodiment.
　図５は、実施形態に係る負荷時タップ切換装置１０Ｂを含む変圧装置１の構成図である。なお、第１の実施形態と同一の構成には同一の符号を付し、重複する説明は省略する。 FIG. 5 is a configuration diagram of the transformer device 1 including the on-load tap switching device 10B according to the embodiment. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted.
　負荷時タップ切換装置１０Ｂは、タップ選択器１１と、切換開閉器１２と、パルストランス１４Ｂと、槽１５とを備える。 The on-load tap switching device 10B includes a tap selector 11, a switching switch 12, a pulse transformer 14B, and a tank 15.
　パルストランス１４Ｂは、絶縁構造１４０を有するモールドトランスである。絶縁構造１４０は、樹脂などで形成された被覆によってパルストランス１４Ｂ全体を包み込むように形成されていてもよい。例えば、パルストランス１４Ｂがモールドトランスであることで、負荷時タップ切換装置１０Ｂは、サイリスタ１２１の制御に必要な全ての信号線を一括でモールド絶縁することができる。 The pulse transformer 14B is a mold transformer having an insulating structure 140. The insulating structure 140 may be formed so as to wrap the entire pulse transformer 14B with a coating formed of resin or the like. For example, when the pulse transformer 14B is a mold transformer, the on-load tap switching device 10B can collectively mold-insulate all signal lines necessary for controlling the thyristor 121.
　本実施形態によれば、パルストランス１４Ｂは、その絶縁構造が頑強である。さらに、パルストランス１４Ｂは、槽内媒体５の中に含浸されるため、パルストランス１４Ｂの各端子の絶縁補強を省略することができ、パルストランス１４Ｂの小型化と省コスト化を実現することが可能である。 According to the present embodiment, the pulse transformer 14B has a robust insulation structure. Furthermore, since the pulse transformer 14B is impregnated in the medium 5 in the tank, the insulation reinforcement of each terminal of the pulse transformer 14B can be omitted, and the pulse transformer 14B can be reduced in size and cost. Is possible.
（第４の実施形態）
　次に、実施形態に係る負荷時タップ切換装置１０Ｃについて説明する。本実施形態の負荷時タップ切換装置１０Ｃは、パルストランス１４Ｃの構造が第２の実施形態のパルストランス１４の構造とは異なるものである。 (Fourth embodiment)
Next, the on-load tap switching device 10C according to the embodiment will be described. The on-load tap switching device 10C of this embodiment is different in the structure of the pulse transformer 14C from the structure of the pulse transformer 14 of the second embodiment.
　図６は、実施形態に係る負荷時タップ切換装置１０Ｃを含む変圧装置１の構成図である。なお、第２の実施形態と同一の構成には同一の符号を付し、重複する説明は省略する。 FIG. 6 is a configuration diagram of the transformer device 1 including the on-load tap switching device 10C according to the embodiment. In addition, the same code | symbol is attached | subjected to the structure same as 2nd Embodiment, and the overlapping description is abbreviate | omitted.
　負荷時タップ切換装置１０Ｃは、タップ選択器１１と、切換開閉器１２と、パルストランス１４Ｃと、槽１５とを備える。 The on-load tap switching device 10 </ b> C includes a tap selector 11, a switching switch 12, a pulse transformer 14 </ b> C, and a tank 15.
　パルストランス１４Ｃは、絶縁構造１４０を有するモールドトランスである。絶縁構造１４０は、樹脂などで形成された被覆によってパルストランス１４Ｃ全体を包み込むように形成されていてもよい。例えば、パルストランス１４Ｃがモールドトランスであることで、負荷時タップ切換装置１０Ｃは、サイリスタ１２１の制御に必要な全ての信号線を一括でモールド絶縁することができる。 The pulse transformer 14 </ b> C is a mold transformer having an insulating structure 140. The insulating structure 140 may be formed so as to wrap the entire pulse transformer 14C with a coating formed of resin or the like. For example, since the pulse transformer 14C is a mold transformer, the on-load tap switching device 10C can mold-insulate all signal lines necessary for controlling the thyristor 121 at once.
　本実施形態によれば、第２の実施形態と同様の効果を奏することの他、パルストランス１４Ｃは、モールド絶縁構造であることにより、その絶縁構造が頑強である。このため、パルストランス１４Ｃの各端子の絶縁補強を省略することができ、パルストランス１４Ｃの小型化と省コスト化を実現することが可能である。 According to this embodiment, in addition to the same effects as those of the second embodiment, the pulse transformer 14C has a mold insulation structure, so that the insulation structure is robust. For this reason, the insulation reinforcement of each terminal of the pulse transformer 14C can be omitted, and the pulse transformer 14C can be reduced in size and cost.
（第５の実施形態）
　次に、実施形態に係る負荷時タップ切換装置１０Ｄについて説明する。本実施形態の負荷時タップ切換装置１０Ｄは、制御回路２０からの制御信号が光ファイバを介して光信号で伝送されることが第１から第４の実施形態とは異なるものである。 (Fifth embodiment)
Next, the on-load tap switching device 10D according to the embodiment will be described. The on-load tap switching device 10D of this embodiment is different from the first to fourth embodiments in that a control signal from the control circuit 20 is transmitted as an optical signal via an optical fiber.
　図７は、実施形態に係る負荷時タップ切換装置１０Ｄを含む変圧装置１Ｄの構成図である。なお、第１の実施形態と同一の構成には同一の符号を付し、重複する説明は省略する。 FIG. 7 is a configuration diagram of a transformer device 1D including the on-load tap switching device 10D according to the embodiment. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted.
　変圧装置１は、変圧器タンク２と、変圧器３と、負荷時タップ切換装置１０Ｄと、ＥＯ変換回路１６（ＥＯ）と、制御回路２０とを備える。
　ＥＯ変換回路１６は、制御回路２０からの制御信号を光信号に変換して、光ファイバ３０に供給する。本実施形態のＥＯ変換回路１６は、変圧器タンク２の外部に配置される。
　制御回路２０は、ＥＯ変換回路１６と光ファイバ３０とを介して負荷時タップ切換装置１０Ｄに接続される。ＥＯ変換回路１６は、制御回路２０から供給される電気信号を光信号に変換し、光ファイバ３０を介して負荷時タップ切換装置１０Ｄに供給する。 The transformer device 1 includes a transformer tank 2, a transformer 3, a load tap switching device 10 </ b> D, an EO conversion circuit 16 (EO), and a control circuit 20.
The EO conversion circuit 16 converts a control signal from the control circuit 20 into an optical signal and supplies the optical signal to the optical fiber 30. The EO conversion circuit 16 of the present embodiment is disposed outside the transformer tank 2.
The control circuit 20 is connected to the on-load tap switching device 10D via the EO conversion circuit 16 and the optical fiber 30. The EO conversion circuit 16 converts the electric signal supplied from the control circuit 20 into an optical signal, and supplies the optical signal to the on-load tap switching device 10D via the optical fiber 30.
　負荷時タップ切換装置１０Ｄは、タップ選択器１１と、切換開閉器１２と、ＯＥ変換回路１７（ＯＥ）と、槽１５とを備える。ＯＥ変換回路１７は、絶縁仲介部の一例である。 The on-load tap switching device 10 </ b> D includes a tap selector 11, a switching switch 12, an OE conversion circuit 17 (OE), and a tank 15. The OE conversion circuit 17 is an example of an insulation mediation unit.
　切換開閉器１２とＯＥ変換回路１７は、例えば、共通の一つの槽１５に収容されている。槽１５の内部は、切換開閉器１２とＯＥ変換回路１７等の槽１５に対する電気的な絶縁性が確保されるように槽内媒体５が満たされている。 The switching switch 12 and the OE conversion circuit 17 are accommodated in one common tank 15, for example. The inside of the tank 15 is filled with the medium 5 in the tank so as to ensure electrical insulation with respect to the tank 15 such as the switching switch 12 and the OE conversion circuit 17.
　図８は、実施形態の変圧装置１の負荷時タップ切換装置１０Ｄの概要を示す構成図である。図８は、複数の相のうちの１相を例示するものであり、他の相も同様である。前述の図３と異なる点を中心に説明する。 FIG. 8 is a configuration diagram illustrating an outline of the on-load tap switching device 10D of the transformer device 1 according to the embodiment. FIG. 8 illustrates one of a plurality of phases, and the other phases are the same. A description will be given centering on differences from FIG. 3 described above.
　ＯＥ変換回路１７は、自回路の外部から取得される光信号を、電気信号に変換してサイリスタ１２１を駆動する。例えば、ＯＥ変換回路１７は、信号変換部１７１と電源部１７２とを備える。信号変換部１７１は、ＥＯ変換回路１６から送信された光信号を、光ファイバ３０を介して受信して電気信号に変換する。ＯＥ変換回路１７は、変圧器３の変圧器タンク２の外部から電気的に絶縁されている。例えば、ＯＥ変換回路１７は、光ファイバ３０を介して接続することにより制御回路２０から絶縁されている。ＯＥ変換回路１７は、フォトダイオード又はフォトトランジスタによって光ファイバ３０から出力される光を検出し、サイリスタ１２１のゲートに検出した信号を供給してもよい。ＯＥ変換回路１７は、上記のように供給された制御信号に基づいて、サイリスタ１２１を導通状態と遮断状態とのいずれかに制御する。 The OE conversion circuit 17 converts the optical signal acquired from the outside of its own circuit into an electric signal and drives the thyristor 121. For example, the OE conversion circuit 17 includes a signal conversion unit 171 and a power supply unit 172. The signal conversion unit 171 receives the optical signal transmitted from the EO conversion circuit 16 via the optical fiber 30 and converts it into an electrical signal. The OE conversion circuit 17 is electrically insulated from the outside of the transformer tank 2 of the transformer 3. For example, the OE conversion circuit 17 is insulated from the control circuit 20 by being connected via the optical fiber 30. The OE conversion circuit 17 may detect light output from the optical fiber 30 with a photodiode or a phototransistor, and supply the detected signal to the gate of the thyristor 121. Based on the control signal supplied as described above, the OE conversion circuit 17 controls the thyristor 121 to either the conductive state or the cut-off state.
　電源部１７２は、その入力側がタップ選択器１１の１対の端子ＴＡとＴＢに接続される。つまり、電源部１７２は、調整用のタップに対応する端子ＴＡとＴＢを介して、それぞれのタップに接続される。例えば、電源部１７２は、一方の入力端子が端子ＴＡを介してタップＴ３に接続され、他方の入力端子が端子ＴＢを介してタップＴ４に接続される。電源部１７２は、上記の一対のタップから交流電力を得て、信号変換部１７１を機能させるための電力を生成する。例えば、電源部１７２は、１対のタップＴ３とタップＴ４との間に生じている交流電圧を変圧して整流することで、所望の電圧の直流を生成し、生成した直流電力を信号変換部１７１に供給する。この電源部１７２は、槽１５（接地電位）に対する絶縁耐力を有している。例えば、電源部１７２は、各相にそれぞれ設けてもよく、相間の絶縁性を確保して各相のＯＥ変換回路１７に電力を供給するようにしてもよい。この場合、ＯＥ変換回路１７は、タップ選択器１１により接触されるタップ巻線３Ｗから制御用の電力を取得する。つまり、ＯＥ変換回路１７は、変圧器３を収容する変圧器タンク２の外部にある制御回路２０とサイリスタ１２１とを電気的に絶縁すると共に、サイリスタ１２１を駆動するための制御用の電力を変圧器３以外から得ることなく、制御回路２０からサイリスタ１２１のゲート端子１２１１への信号を仲介する。 The input side of the power supply unit 172 is connected to a pair of terminals TA and TB of the tap selector 11. That is, the power supply unit 172 is connected to each tap via the terminals TA and TB corresponding to the adjustment tap. For example, the power supply unit 172 has one input terminal connected to the tap T3 via the terminal TA and the other input terminal connected to the tap T4 via the terminal TB. The power supply unit 172 obtains AC power from the pair of taps, and generates power for causing the signal conversion unit 171 to function. For example, the power supply unit 172 generates a direct current of a desired voltage by transforming and rectifying an alternating voltage generated between the pair of taps T3 and T4, and the generated direct-current power is converted into a signal conversion unit. 171. The power supply unit 172 has a dielectric strength with respect to the tank 15 (ground potential). For example, the power supply unit 172 may be provided for each phase, or power may be supplied to the OE conversion circuit 17 for each phase while ensuring insulation between the phases. In this case, the OE conversion circuit 17 acquires power for control from the tap winding 3 </ b> W that is contacted by the tap selector 11. That is, the OE conversion circuit 17 electrically insulates the control circuit 20 outside the transformer tank 2 that houses the transformer 3 from the thyristor 121 and transforms control power for driving the thyristor 121. The signal from the control circuit 20 to the gate terminal 1211 of the thyristor 121 is mediated without being obtained from other than the device 3.
　なお、タップ選択器１１が調整用のタップを切換えると、電源部１７２への入力が途絶える時がある。負荷時タップ切換装置１０Ｄは、タップ選択器１１がタップを切換える期間ではない期間に、切換開閉器１２がタップを切換える。このように、タップ選択器１１と切換開閉器１２が、タップを切換えるタイミングが異なることから、タップ選択器１１がタップを切換える際に、電源部１７２に供給される電力が途絶えても、切換開閉器１２の動作に支障はない。信号変換部１７１は、電源部１７２から電力が継続して供給されている期間に、制御回路２０からの制御信号を受け、それを変換する。 Note that when the tap selector 11 switches the adjustment tap, the input to the power supply unit 172 may be interrupted. In the on-load tap switching device 10D, the switching switch 12 switches the tap during a period that is not a period during which the tap selector 11 switches the tap. As described above, since the tap selector 11 and the switching switch 12 have different tap switching timings, even when the power supplied to the power supply unit 172 is interrupted when the tap selector 11 switches the tap, the switching opening / closing is performed. There is no problem in the operation of the device 12. The signal conversion unit 171 receives a control signal from the control circuit 20 and converts it during a period in which power is continuously supplied from the power supply unit 172.
　本実施形態によれば、外部から制御用電力の供給を受けることなく、ＯＥ変換回路１７の電力を負荷時タップ切換装置１０Ｄの内部で生成することができ、第１から第４の実施形態と同様に、複雑な構成を避け、安価に構成できる。 According to the present embodiment, the power of the OE conversion circuit 17 can be generated inside the on-load tap switching device 10D without receiving supply of control power from the outside, which is the same as in the first to fourth embodiments. Similarly, a complicated configuration can be avoided and the configuration can be made inexpensively.
（第６の実施形態）
　次に、実施形態に係る負荷時タップ切換装置１０Ｅについて説明する。本実施形態の負荷時タップ切換装置１０Ｅは、ＥＯ変換回路１６を配置する位置が第５の実施形態のものとは異なり、負荷時タップ切換装置１０Ｅの槽１５の内部に配置される。 (Sixth embodiment)
Next, the on-load tap switching device 10E according to the embodiment will be described. Unlike the fifth embodiment, the on-load tap switching device 10E of the present embodiment is disposed inside the tank 15 of the on-load tap switching device 10E, unlike the fifth embodiment.
　図９は、実施形態に係る負荷時タップ切換装置１０Ｅを含む変圧装置１の構成図である。なお、第５の実施形態と同一の構成には同一の符号を付し、重複する説明は省略する。 FIG. 9 is a configuration diagram of the transformer device 1 including the on-load tap switching device 10E according to the embodiment. In addition, the same code | symbol is attached | subjected to the structure same as 5th Embodiment, and the overlapping description is abbreviate | omitted.
　制御回路２０は、制御線ＬＮにより負荷時タップ切換装置１０Ｅに接続される。 The control circuit 20 is connected to the on-load tap switching device 10E by the control line LN.
　負荷時タップ切換装置１０Ｅは、タップ選択器１１と、切換開閉器１２と、槽１５と、ＥＯ変換回路１６Ｅと、ＯＥ変換回路１７Ｅとを備える。ＥＯ変換回路１６ＥとＯＥ変換回路１７Ｅは、前述のＥＯ変換回路１６とＯＥ変換回路１７に対応する。以下、それらとの相違点を中心に説明する。 The on-load tap switching device 10E includes a tap selector 11, a switching switch 12, a tank 15, an EO conversion circuit 16E, and an OE conversion circuit 17E. The EO conversion circuit 16E and the OE conversion circuit 17E correspond to the EO conversion circuit 16 and the OE conversion circuit 17 described above. Hereinafter, it demonstrates centering around difference with them.
　切換開閉器１２とＥＯ変換回路１６ＥとＯＥ変換回路１７Ｅは、一つの槽１５に収容されている。槽１５の内部は、切換開閉器１２とＯＥ変換回路１７Ｅ等の、槽１５とＥＯ変換回路１６Ｅに対する電気的な絶縁性が確保されるように槽内媒体５が満たされている。 The switching switch 12, the EO conversion circuit 16E, and the OE conversion circuit 17E are accommodated in one tank 15. The inside of the tank 15 is filled with the medium 5 in the tank so that electrical insulation with respect to the tank 15 and the EO conversion circuit 16E, such as the switching switch 12 and the OE conversion circuit 17E, is ensured.
　ＥＯ変換回路１６Ｅは、制御回路２０から供給される電気信号を光信号に変換して出力する。 The EO conversion circuit 16E converts the electrical signal supplied from the control circuit 20 into an optical signal and outputs it.
　図８を参照しＯＥ変換回路１７Ｅについて説明する。ＯＥ変換回路１７Ｅは、信号変換部１７１Ｅと電源部１７２とを備える。信号変換部１７１Ｅは、ＥＯ変換回路１６から送信された光信号を、受信して電気信号に変換する。ＯＥ変換回路１７Ｅは、ＥＯ変換回路１６Ｅと対を成し、光カプラを形成する。例えば、ＥＯ変換回路１６ＥとＯＥ変換回路１７Ｅは、絶縁耐圧から定まる所定の間隔を隔てて配置され、電気的な絶縁性が確保されている。ＥＯ変換回路１６ＥからＯＥ変換回路１７Ｅまで光を伝える媒体（不図示）は、槽内媒体５であってもよく、光を伝える他の媒体であってもよい。 The OE conversion circuit 17E will be described with reference to FIG. The OE conversion circuit 17E includes a signal conversion unit 171E and a power supply unit 172. The signal conversion unit 171E receives the optical signal transmitted from the EO conversion circuit 16 and converts it into an electrical signal. The OE conversion circuit 17E is paired with the EO conversion circuit 16E to form an optical coupler. For example, the EO conversion circuit 16E and the OE conversion circuit 17E are arranged at a predetermined interval determined from the withstand voltage, and electrical insulation is ensured. The medium (not shown) that transmits light from the EO conversion circuit 16E to the OE conversion circuit 17E may be the medium 5 in the tank or another medium that transmits light.
　本実施形態によれば、外部から制御用電力の供給を受けることなく、ＯＥ変換回路１７Ｅの電力を負荷時タップ切換装置１０Ｅの内部で生成することにより、第５の実施形態と同様に、複雑な構成を避け、安価に構成できる。さらに、本実施形態によれば、光ファイバ３０を利用することなく実現が可能である。 According to the present embodiment, the power of the OE conversion circuit 17E is generated inside the on-load tap switching device 10E without receiving the supply of control power from the outside, so that the complex as in the fifth embodiment. It can be configured at low cost. Furthermore, according to the present embodiment, it can be realized without using the optical fiber 30.
　以上説明した少なくともひとつの実施形態によれば、切換開閉器と、絶縁仲介部と、を持つ。切換開閉器は、半導体スイッチを含み、変圧器に接続されたタップ選択器との接続関係を切り換えることで変圧比を切換える。絶縁仲介部は、前記変圧器を収容する変圧器タンク収容部の外部にある制御回路と前記半導体スイッチとを電気的に絶縁すると共に、前記制御回路から前記半導体スイッチのゲート端子への信号を仲介する。パルストランス１４とＯＥ変換回路１７は、絶縁仲介部の一例である。 According to at least one embodiment described above, it has a switching switch and an insulation mediating part. The switching switch includes a semiconductor switch, and switches the transformation ratio by switching the connection relationship with the tap selector connected to the transformer. The insulation intermediary unit electrically insulates the semiconductor switch from the control circuit outside the transformer tank housing unit that houses the transformer, and mediates a signal from the control circuit to the gate terminal of the semiconductor switch. To do. The pulse transformer 14 and the OE conversion circuit 17 are an example of an insulation mediating unit.
　本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものである。 Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.
１、１Ａ、１Ｂ、１Ｃ、１Ｄ、１Ｅ…変圧装置、２…変圧器タンク（変圧器収容部）、３…変圧器、４…タンク内媒体、５…槽内媒体、１０、１０Ａ、１０Ｂ、１０Ｃ、１０Ｄ、１０Ｅ…負荷時タップ切換装置、１１…タップ選択器、１２…切換開閉器、１４、１４Ａ…パルストランス（絶縁仲介部）、１５…槽、１６、１６Ｅ…ＥＯ変換回路（ＥＯ）、電気光変換回路）、１７、１７Ｅ…ＯＥ変換回路（ＯＥ、絶縁仲介部、光電気変換回路）、２０…制御回路、３０…光ファイバ、１２１…サイリスタ、１２１１…ゲート端子、１７１、１７１Ｅ…信号変換部、１７２…電源部、Ｔ１、Ｔ２、Ｔ３、Ｔ４、Ｔ５、Ｔ６…タップ（巻線接続用タップ）、３Ｗ…タップ巻線 1, 1A, 1B, 1C, 1D, 1E ... transformer, 2 ... transformer tank (transformer housing), 3 ... transformer, 4 ... medium in tank, 5 ... medium in tank, 10, 10A, 10B, 10C, 10D, 10E ... tap switching device under load, 11 ... tap selector, 12 ... switching switch, 14, 14A ... pulse transformer (insulation mediator), 15 ... tank, 16, 16E ... EO conversion circuit (EO) , Electro-optical conversion circuit), 17, 17E... OE conversion circuit (OE, insulation mediator, photoelectric conversion circuit), 20 ... control circuit, 30 ... optical fiber, 121 ... thyristor, 1211 ... gate terminal, 171, 171E ... Signal conversion unit, 172... Power supply unit, T1, T2, T3, T4, T5, T6... Tap (winding connection tap), 3W.

Claims (10)

  1. 　半導体スイッチを含み、変圧器に接続されたタップ選択器との接続関係を切り換えることで変圧比を切換える切換開閉器と、
    　前記変圧器を収容する変圧器収容部の外部にある制御回路と前記半導体スイッチとを電気的に絶縁すると共に、前記制御回路から前記半導体スイッチのゲート端子への信号を仲介する絶縁仲介部と、
    　を備える負荷時タップ切換装置。     A switching switch that switches the transformation ratio by switching the connection relationship with the tap selector connected to the transformer, including a semiconductor switch,
    Insulating the control circuit and the semiconductor switch outside the transformer housing unit that houses the transformer, and an insulation mediation unit that mediates a signal from the control circuit to the gate terminal of the semiconductor switch;
    An on-load tap changer.
  2. 　前記絶縁仲介部は、パルストランスである、
    　請求項１に記載の負荷時タップ切換装置。     The insulation mediator is a pulse transformer;
    The on-load tap switching device according to claim 1.
  3. 　前記パルストランスは、モールド絶縁構造のパルストランスである、
    　請求項２に記載の負荷時タップ切換装置。     The pulse transformer is a pulse transformer having a mold insulation structure.
    The on-load tap switching device according to claim 2.
  4. 　前記切換開閉器と前記絶縁仲介部とが、前記変圧器収容部に収容される一つの槽に収容されている、
    　請求項１に記載の負荷時タップ切換装置。     The switching switch and the insulation intermediary part are accommodated in one tank accommodated in the transformer accommodating part,
    The on-load tap switching device according to claim 1.
  5. 　前記切換開閉器が前記変圧器収容部に収容される一つの槽に収容され、
    　前記絶縁仲介部が前記変圧器収容部に収容され且つ前記槽の外に設けられている、
    　請求項１に記載の負荷時タップ切換装置。     The switching switch is accommodated in one tank accommodated in the transformer accommodating portion,
    The insulation intermediary part is accommodated in the transformer accommodating part and provided outside the tank;
    The on-load tap switching device according to claim 1.
  6. 　前記絶縁仲介部は、前記半導体スイッチを制御するための電力を前記変圧器以外から得ることなく、前記制御回路から前記半導体スイッチのゲート端子への信号を仲介する、
    　請求項１に記載の負荷時タップ切換装置。     The insulation mediation unit mediates a signal from the control circuit to the gate terminal of the semiconductor switch without obtaining power for controlling the semiconductor switch from other than the transformer,
    The on-load tap switching device according to claim 1.
  7. 　前記絶縁仲介部は、光信号を電気信号に変換して前記半導体スイッチを駆動する光電気変換回路を備える
    　請求項１に記載の負荷時タップ切換装置。     The on-load tap switching device according to claim 1, wherein the insulation mediating unit includes a photoelectric conversion circuit that converts an optical signal into an electrical signal to drive the semiconductor switch.
  8. 　前記光電気変換回路は、自回路の外部から取得される光信号を、電気信号に変換して前記半導体スイッチを駆動する、
    　請求項７に記載の負荷時タップ切換装置。     The photoelectric conversion circuit converts an optical signal acquired from the outside of its own circuit into an electrical signal and drives the semiconductor switch.
    The on-load tap switching device according to claim 7.
  9. 　前記光電気変換回路は、前記制御回路から取得される電気信号である制御信号を光信号に変換し、前記光信号を電気信号に変換して前記半導体スイッチを駆動する、
    　請求項７に記載の負荷時タップ切換装置。     The photoelectric conversion circuit converts a control signal, which is an electrical signal acquired from the control circuit, into an optical signal, converts the optical signal into an electrical signal, and drives the semiconductor switch.
    The on-load tap switching device according to claim 7.
  10. 　前記光電気変換回路は、前記タップ選択器により接触されるタップ巻線から制御用の電力を取得する、
    　請求項７に記載の負荷時タップ切換装置。     The photoelectric conversion circuit acquires power for control from a tap winding contacted by the tap selector.
    The on-load tap switching device according to claim 7.
PCT/JP2016/080391 2016-10-13 2016-10-13 On-load tap switching device WO2018070023A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021097088A (en) * 2019-12-13 2021-06-24 株式会社ダイヘン Loading state tap changer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS609362A (en) * 1983-06-27 1985-01-18 Hitachi Ltd Pulse transformer
JPH0822922A (en) * 1994-07-08 1996-01-23 Hitachi Ltd Tap change-over switch when loaded and abnormality diagnosing device and method
JPH0917660A (en) * 1995-06-26 1997-01-17 Shigeisa Imoto Switch circuit
JP2002270430A (en) * 2001-03-12 2002-09-20 Toshiba Corp Pulse transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS609362A (en) * 1983-06-27 1985-01-18 Hitachi Ltd Pulse transformer
JPH0822922A (en) * 1994-07-08 1996-01-23 Hitachi Ltd Tap change-over switch when loaded and abnormality diagnosing device and method
JPH0917660A (en) * 1995-06-26 1997-01-17 Shigeisa Imoto Switch circuit
JP2002270430A (en) * 2001-03-12 2002-09-20 Toshiba Corp Pulse transformer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021097088A (en) * 2019-12-13 2021-06-24 株式会社ダイヘン Loading state tap changer
JP7312099B2 (en) 2019-12-13 2023-07-20 株式会社ダイヘン on-load tap changer

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