WO2020194373A1 - Dispositif de suppression de ferrorésonance et transformateur de tension comportant ledit dispositif - Google Patents

Dispositif de suppression de ferrorésonance et transformateur de tension comportant ledit dispositif Download PDF

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Publication number
WO2020194373A1
WO2020194373A1 PCT/JP2019/012065 JP2019012065W WO2020194373A1 WO 2020194373 A1 WO2020194373 A1 WO 2020194373A1 JP 2019012065 W JP2019012065 W JP 2019012065W WO 2020194373 A1 WO2020194373 A1 WO 2020194373A1
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WIPO (PCT)
Prior art keywords
voltage
iron
iron core
transformer
resistor
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PCT/JP2019/012065
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English (en)
Japanese (ja)
Inventor
角田　孝典
大輔 澁谷
芳樹 川渕
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日新電機株式会社
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Priority to PCT/JP2019/012065 priority Critical patent/WO2020194373A1/fr
Publication of WO2020194373A1 publication Critical patent/WO2020194373A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers

Definitions

  • the present invention relates to an iron resonance suppression device for suppressing an iron resonance phenomenon in a voltage transformer for measuring voltage in a transmission line or an electric power facility, and a voltage transformer provided therewith.
  • Power equipment with an iron core has an exciting inductance L.
  • the circuit system is a circuit in which the capacitance C coexists, the iron core constituting the exciting inductance L due to the transient phenomenon when the circuit is opened and connected (when the circuit breaker or the like is opened and closed). Is temporarily magnetically saturated, energy is transferred between the circuits, and the vibration is sustained, which may cause abnormal noise, burning due to overheating, dielectric breakdown, and the like. This phenomenon is known as the iron resonance phenomenon.
  • the iron resonance phenomenon is an electrical disturbance phenomenon starting from the saturation phenomenon of the iron core.
  • Non-Patent Document 1 As shown in FIG. 4, the iron resonance phenomenon has a: fundamental overvoltage mode, b: subharmonic mode, and c: quasi-periodic mode. It is disclosed that it is classified into four patterns of periodic mode) and d: Chaotech mode (Chaotic mode).
  • the fundamental wave overvoltage mode is a vibration mode in which the amplitude of the fundamental wave becomes large and harmonics such as third and fifth orders are superimposed.
  • the fractional tuning mode is a vibration mode in which a large fractional tuning (1 / n tuning) vibration is added to the fundamental wave.
  • the quasi-periodic mode is a vibration mode having a difference frequency between frequencies that are integral multiples of each of the two frequencies.
  • the chaotic mode is a vibration mode in which it is difficult to specify the period and the behavior is chaotic.
  • Non-Patent Document 2 discloses a circuit configuration using a saturable reactor. Specifically, with reference to FIG. 5, a saturable reactor 902 connected in series and a resistor 904 having a low resistance value are connected in parallel to the secondary winding of a transformer 900 such as a voltage transformer. When the iron resonance phenomenon occurs, the saturable reactor 902 is saturated by the generated voltage, and the generated current is passed through the resistor 904 to absorb the resonance energy. As a result, the iron resonance phenomenon is suppressed.
  • Patent Document 1 discloses measures for the fractional wave adjustment mode. That is, a circuit for detecting the overvoltage of 1/3, 1/5, and fundamental waves peculiar to iron resonance is provided on the secondary side of the instrument transformer, and the iron resonance phenomenon is detected and assisted by this circuit. It drives a relay and absorbs resonance energy with a low resistance load.
  • Non-Patent Document 2 the saturable reactor may not be sufficiently saturated depending on the situation, and the iron resonance phenomenon may continue. If the iron resonance phenomenon continues, the equipment may burn out.
  • a complicated circuit using a semiconductor IC is used, and its control power also needs to be supplied from the outside, resulting in a high cost and a large-sized device.
  • the present invention adopts a method using a saturable reactor, can detect the magnetic saturation phenomenon of the iron core representing the iron resonance phenomenon itself more reliably than before, and can suppress the iron resonance phenomenon quickly and efficiently. It is an object of the present invention to provide a resonance suppression device and a voltage modulator equipped with the resonance suppression device.
  • the iron resonance suppression device is an iron resonance suppression device for suppressing an iron resonance phenomenon in an iron core and a transformer having a primary winding and a secondary winding wound around the iron core.
  • a saturable reactor in which one terminal is connected to one terminal in the secondary winding, and a first terminal connected between the other terminal in the saturable reactor and the other terminal in the secondary winding.
  • the occurrence of iron core saturation of the transformer is detected from the DC voltage generator that rectifies and smoothes the voltage between both terminals of the resistor and the first resistor and outputs it as a DC voltage, and the DC voltage output from the DC voltage generator.
  • It includes an iron core saturation detecting unit and a short-circuiting portion that short-circuits both terminals of the secondary winding via a second resistor in response to the detection of the occurrence of iron core saturation by the iron core saturation detecting unit.
  • the magnetic saturation phenomenon of the iron core which represents the iron resonance phenomenon itself generated in a voltage transformer or the like having a transformer, can be detected more reliably than before, and the iron resonance phenomenon can be suppressed quickly and efficiently.
  • the impedance of the saturable reactor is designed to be smaller than the impedance of the first resistor when the iron core of the transformer is saturated. As a result, the iron resonance phenomenon can be quickly suppressed.
  • the impedance of the saturable reactor is designed to be smaller than the impedance of the first resistor when the transformer core saturation approaches.
  • the energy can be consumed by the second resistance at the stage before the iron resonance phenomenon occurs, that is, at the stage when the sign of the iron resonance phenomenon occurs, and the occurrence of the iron resonance phenomenon can be suppressed.
  • the short circuit is a relay
  • the contacts of the relay and the second resistor are connected in series and connected between both terminals of the secondary winding
  • the core saturation detector controls the contacts of the relay.
  • a DC voltage output from the DC voltage generator is applied to both terminals of the coil and the switching element connected in series, including a switching element connected in series to the coil to be connected and a constant voltage element to control the switching element.
  • the constant voltage element turns on the switching element, and when the switching element is turned on, a current flows through the coil and the contacts are turned on.
  • the iron resonance phenomenon can be suppressed by turning on the relay and consuming the resonance energy by the second resistor without separately providing a power source for driving the relay. Therefore, a small iron resonance suppression device can be realized.
  • the voltage transformer according to the second aspect of the present invention includes an iron core, a transformer having a primary winding and a secondary winding wound around the iron core, and the above-mentioned iron resonance suppression device, and suppresses iron resonance.
  • the device suppresses the iron resonance phenomenon in the transformer.
  • the magnetic saturation phenomenon of the iron core which represents the iron resonance phenomenon itself generated in the voltage transformer, can be detected more reliably than before, and the iron resonance phenomenon can be suppressed quickly and efficiently.
  • the magnetic saturation phenomenon of the iron core which represents the iron resonance phenomenon itself generated in the voltage transformer or the like, can be detected more reliably than before, and the iron resonance phenomenon can be suppressed quickly and efficiently. That is, by using the saturable reactor as a sensor, the iron resonance phenomenon can be detected even in a saturated state in which the saturable reactor is insufficient, and the iron resonance phenomenon can be quickly suppressed.
  • the iron resonance suppression device can be realized as a relatively small-scale circuit, not as a circuit through which a large current flows. Therefore, it is possible to incorporate an iron resonance suppression device into an existing voltage transformer or the like.
  • the voltage transformer includes a transformer 200 and an iron resonance suppression unit 100.
  • the transformer 200 is a transformer that constitutes the main body of the voltage transformer, and outputs an output signal OUT from the secondary winding.
  • the iron resonance suppression unit 100 includes a saturable reactor 102, a rectifying smoothing unit 104, an active element 106, a level detection unit 108, a relay unit 110, and resistors R1 and R2.
  • the saturable reactor 102 and the resistor R1 are connected in series.
  • the saturable reactor 102 and the resistor R1 connected in series are connected in parallel to the secondary winding of the transformer 200. As a result, the AC voltage generated in the secondary winding is shared by the saturable reactor 102 and the resistor R1.
  • the saturable reactor 102 has, for example, an iron core having a steep magnetic saturation characteristic, and is designed by simulating the saturation characteristic of a transformer as described above. That is, in the normal state where the transformer is not saturated, it is not saturated and has a large impedance. On the other hand, when the transformer is saturated or approaches saturation, the saturable reactor 102 is saturated and the impedance decreases sharply. When the saturable reactor 102 is saturated, its impedance is preferably sufficiently smaller than the impedance of the resistor R1. For the design of the saturable reactor, a method of designing the saturation magnetic flux density from the secondary voltage waveform based on the saturation characteristics of the transformer is used.
  • Both terminals of the resistor R1 are connected to the input terminals of the rectifying smoothing unit 104. That is, of the two input terminals of the rectifying smoothing unit 104, the first input terminal in1 is connected to one terminal of the resistor R1, and the second input terminal in2 is connected to the other terminal of the resistor R1.
  • the potential of one terminal of the resistor R1 is V1
  • the potential of the other terminal is V2.
  • the rectifying and smoothing unit 104 rectifies and smoothes the AC voltage (V1-V2) between both terminals of the input resistor R1, and direct current is applied between the two output terminals (first output terminal out1 and second output terminal out2). Generate a voltage (V3-V4).
  • the potential of the first output terminal out1 is V3, and the potential of the second output terminal out2 is V4.
  • the potential V4 of the second output terminal out2 is a reference potential of the DC voltage output from the rectifying smoothing unit 104.
  • the rectifying and smoothing unit 104 can be configured by a known rectifying circuit and smoothing circuit.
  • a full-wave rectifier circuit (for example, a bridge circuit with four diodes) is preferably used as the rectifier circuit, but a half-wave rectifier circuit may be used.
  • the smoothing circuit can be realized, for example, by providing a capacitor (smoothing capacitor) between the output terminals of the rectifier circuit.
  • the smoothing capacitor is for smoothing the voltage (pulsating current) rectified by the rectifier circuit and generating a constant DC voltage.
  • the active element 106 is connected between the first output terminal out1 of the rectifying smoothing unit 104 and the relay unit 110.
  • the active element 106 has a function as a switching element that is controlled by a signal input to the gate to short-circuit or open the first output terminal out1 of the rectifying smoothing unit 104 and the relay unit 110.
  • a level detection unit 108 is connected to the gate of the active element 106.
  • the level detection unit 108 has a function of maintaining the voltage between both terminals at a constant value when the voltage between both terminals exceeds a certain value. That is, when the potential V3 of the first output terminal out1 of the rectifying / smoothing unit 104 becomes equal to or higher than a predetermined value, the level detecting unit 108 is connected to the potential of the first output terminal out1 of the rectifying / smoothing unit 104 and the gate of the active element 106. The difference (voltage) from the potential V5 of the terminal is maintained at a constant value. If this constant value is set to a value equal to or higher than the gate voltage at which the active element 106 is turned on, the active element 106 is turned on.
  • the relay unit 110 is, for example, a known relay, and a coil for turning on the internal contact is connected between the active element 106 and the second output terminal out2 of the rectifying smoothing unit 104.
  • One terminal of the internal contact is connected to the resistor R2 and the other terminal is grounded.
  • the terminal not connected to the relay portion 110 of the resistor R2 is connected to the output line of the transformer 200.
  • the resistor R2 is a resistor having a small resistance value, and is for absorbing resonance energy due to the iron resonance phenomenon.
  • the iron resonance phenomenon occurs when the iron core of the transformer of the transformer is saturated.
  • the iron resonance suppression unit 100 configured in this way takes measures by using a waveform in which this phenomenon appears in the secondary voltage.
  • the iron resonance suppression unit 100 operates as follows.
  • the saturable reactor 102 In the normal state where the iron resonance phenomenon does not occur, the saturable reactor 102 is not saturated and has a large impedance, and the voltage generated in the secondary winding of the transformer 200 is almost the saturable reactor 102.
  • the voltage between both terminals of the resistor R1 is a small value. Therefore, the input voltage (alternating current) of the rectifying and smoothing unit 104 is small, the DC voltage (V3-V4) output from the rectifying and smoothing unit 104 is small, the voltage between both terminals of the level detecting unit 108 is small, and the active element 106 is It remains off. Therefore, no current flows through the coil inside the relay unit 110, the internal contacts remain off, and no current flows through the resistor R2.
  • the input voltage (alternating current) of the rectifying and smoothing unit 104 increases, and the DC voltage (V3-V4) output from the rectifying and smoothing unit 104 also increases.
  • the voltage between both terminals of the level detection unit 108 becomes a constant value (the voltage that turns on the active element 106 is also large), the active element 106 is turned on, and the first output terminal out1 and the second output terminal out2 of the rectifying smoothing unit 104 are turned on. Is connected to the coil of the relay unit 110, and a current flows through the coil.
  • the iron resonance suppression unit 100 returns to the normal state. That is, the saturable reactor 102 is no longer saturated, its impedance becomes large, the voltage generated in the secondary winding of the transformer 200 is almost shared by the saturable reactor 102, and the voltage between both terminals of the resistor R1 becomes small. .. That is, the input voltage (alternating current) of the rectifying and smoothing unit 104 becomes small, the DC voltage (V3-V4) output from the rectifying and smoothing unit 104, and the voltage between both terminals of the level detecting unit 108 become small, and the active element 106 Turns off. Therefore, the internal contact of the relay unit 110 is turned off, and no current flows through the resistor R2.
  • the iron resonance phenomenon can be suppressed by using the saturable reactor 102 as a sensor for detecting the magnetic saturation phenomenon of the iron core of the transformer, which represents the essence of the iron resonance phenomenon itself.
  • the iron resonance suppression unit 100 can be realized as a relatively small-scale circuit, not as a circuit through which a large current flows. Further, since the rectifying smoothing unit 104, the active element 106, and the level detecting unit 108 are used as a control power source for driving the relay unit 110 when the iron resonance phenomenon occurs, the power source for driving the relay unit 110 is used. It is not necessary to separately provide it or to supply the voltage for driving the relay unit 110 from an external power source. Therefore, the iron resonance suppression unit 100 can be manufactured inexpensively and compactly, and the iron resonance suppression unit 100 can be incorporated in an existing voltage transformer.
  • the voltage transformer according to this modification includes a transformer 200 and an iron resonance suppression unit 130.
  • the transformer 200 is a transformer that constitutes the main body of the voltage transformer, and outputs an output signal OUT from the secondary winding.
  • the iron resonance suppression unit 130 includes the same components as the iron resonance suppression unit 100 shown in FIG. That is, the iron resonance suppression unit 130 includes a saturable reactor 102, a rectifying smoothing unit 104, an active element 106, a level detection unit 108, a relay unit 110, and resistors R1 and R2.
  • the iron resonance suppression unit 130 differs from the iron resonance suppression unit 100 only in the connection relationship between the active element 106 and its peripheral elements, and the function of each element is the same as that of the iron resonance suppression unit 100. Therefore, in the following, the duplicate description will not be repeated, and the points different from the iron resonance suppression unit 100 will be mainly described.
  • the active element 106 is connected between the second output terminal out2 of the rectifying smoothing unit 104 and the relay unit 110 (specifically, one end of the internal coil).
  • the active element 106 is controlled by a signal input to the gate to short-circuit or open the second output terminal out2 of the rectifying smoothing unit 104 and the relay unit 110.
  • the first output terminal out1 of the rectifying and smoothing unit 104 is directly connected to the relay unit 110 (the other end of the internal coil).
  • the iron resonance suppression unit 130 configured in this way operates in the same manner as the iron resonance suppression unit 100 of FIG. That is, in the normal state where the iron resonance phenomenon does not occur, the saturable reactor 102 is not saturated and has a large impedance, and the voltage generated in the secondary winding of the transformer 200 is almost saturable. It is shared by the reactor 102, and the voltage between both terminals of the resistor R1 is a small value.
  • the input voltage (alternating current) of the rectifying and smoothing unit 104 is small, the DC voltage (V3-V4) output from the rectifying and smoothing unit 104 and the voltage between both terminals of the level detection unit 108 are small, and the active element 106 and the relay unit The internal contacts of 110 remain off and no current flows through resistor R2.
  • the saturable reactor 102 When the iron resonance phenomenon occurs, the saturable reactor 102 is saturated and its impedance sharply decreases. As a result, the voltage generated in the secondary winding of the transformer 200 is almost shared by the resistor R1, and the voltage between both terminals of the resistor R1 rapidly increases. Therefore, the input voltage (alternating current) of the rectifying and smoothing unit 104 increases, the DC voltage (V3-V4) output from the rectifying and smoothing unit 104, and the voltage between both terminals of the level detection unit 108 increase, and the active element 106 Is turned on, and the first output terminal out1 and the second output terminal out2 of the rectifying smoothing unit 104 are connected to the coil of the relay unit 110, and a current flows through the coil.
  • the current flowing through the primary winding of the transformer 200 returns to the normal level, and the iron resonance suppression unit 130 returns to the normal state.
  • the iron resonance suppression unit 130 As described above, in the iron resonance suppression unit 130 as well, as described above, by using the saturable reactor 102 as a sensor for detecting the magnetic saturation phenomenon of the iron core, the saturable reactor 102 is in an insufficient saturated state. Even so, the iron resonance phenomenon can be suppressed. Further, it is not necessary to separately provide a power source for driving the relay unit 110 or to supply a voltage for driving the relay unit 110 from an external power source, and the iron resonance suppression unit 130 can be formed inexpensively and compactly. It is also possible to incorporate the iron resonance suppression unit 130 into an existing voltage transformer.
  • FIG. 3 A more specific circuit configuration is shown as an example. An embodiment corresponding to FIG. 2 is shown in FIG. With reference to FIG. 3, the rectifying smoothing section 104 is composed of a full-wave rectifying circuit 114 and a capacitor C1. The active element 106 and the level detection unit 108 are composed of a transistor 116 and a Zener diode 118, respectively.
  • one output terminal (terminal of potential V3) of the full-wave rectifier circuit 114 is connected to the base terminal of the transistor 116 via a Zener diode 118 and a resistor R5.
  • the resistor R5 is a resistor for limiting the base current of the transistor 116.
  • One output terminal (terminal of potential V3) of the full-wave rectifier circuit 114 is also connected to the relay unit 110 (internal coil) via a resistor R6.
  • the resistor R6 is for adjusting the current flowing through the coil inside the relay unit 110 and the transistor 116 when the transistor 116 is turned on.
  • the iron resonance suppression unit configured as shown in FIG. 3 can suppress the iron resonance phenomenon.
  • an iron resonance phenomenon occurs and the voltage between both terminals of the resistor R1, that is, the input voltage (alternating current) of the full-wave rectifier circuit 114 suddenly increases, the voltage (V3-V4) output from the full-wave rectifier circuit 114. Will increase.
  • the potential of the cathode of the Zener diode 118 to which one terminal of the resistor R5 is connected becomes the DC voltage generated by smoothing the voltage output from the full-wave rectifier circuit 114 by the capacitor C1 and becomes the gate of the transistor 116.
  • a base current that turns on the transistor 116 flows through the resistor R5.
  • the active element 106 is composed of N-channel transistors
  • the present invention is not limited to this.
  • N-channel MOSFETs may be used.
  • FETs other than MOSFETs may be used.
  • the magnetic saturation phenomenon of the iron core which represents the iron resonance phenomenon itself generated in a voltage transformer or the like, can be detected, and the iron resonance phenomenon can be suppressed quickly and efficiently.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

La présente invention concerne un dispositif de suppression de ferrorésonance qui est destiné à supprimer un phénomène de ferrorésonance dans un transformateur ayant un noyau de fer et une bobine primaire et une bobine secondaire enroulée autour du noyau de fer. Le dispositif de suppression de ferrorésonance comprend : un réacteur saturable ayant une borne connectée à une borne d'une bobine secondaire ; une première résistance connectée entre l'autre borne du réacteur saturable et l'autre borne de la bobine secondaire ; une unité de génération de tension continue qui délivre une tension continue par redressement et lissage d'une tension entre les deux bornes de la première résistance ; une unité de détection de saturation de noyau de fer qui, à partir de la tension continue délivrée par l'unité de génération de tension continue, détecte l'apparition d'une saturation de noyau de fer d'un transformateur ; et une unité de court-circuit qui, lorsque l'apparition d'une saturation de noyau de fer a été détectée par l'unité de détection de saturation de noyau de fer, amène les deux bornes de la bobine secondaire à court-circuiter par l'intermédiaire d'une seconde résistance.
PCT/JP2019/012065 2019-03-22 2019-03-22 Dispositif de suppression de ferrorésonance et transformateur de tension comportant ledit dispositif WO2020194373A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4109730A1 (fr) * 2021-06-25 2022-12-28 Sungrow Power Supply Co., Ltd. Convertisseur bidirectionnel isolé et son procédé de commande

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59162714A (ja) * 1983-03-04 1984-09-13 日新電機株式会社 計器用変圧装置
JPS59202615A (ja) * 1983-04-30 1984-11-16 Nissin Electric Co Ltd 計器用変圧装置
JPS6039230U (ja) * 1983-08-24 1985-03-19 日新電機株式会社 計器用変圧装置
JPS6127430U (ja) * 1984-07-23 1986-02-19 日新電機株式会社 計器用変圧装置
JPH04331415A (ja) * 1991-04-26 1992-11-19 Toshiba Corp 計器用変圧器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59162714A (ja) * 1983-03-04 1984-09-13 日新電機株式会社 計器用変圧装置
JPS59202615A (ja) * 1983-04-30 1984-11-16 Nissin Electric Co Ltd 計器用変圧装置
JPS6039230U (ja) * 1983-08-24 1985-03-19 日新電機株式会社 計器用変圧装置
JPS6127430U (ja) * 1984-07-23 1986-02-19 日新電機株式会社 計器用変圧装置
JPH04331415A (ja) * 1991-04-26 1992-11-19 Toshiba Corp 計器用変圧器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4109730A1 (fr) * 2021-06-25 2022-12-28 Sungrow Power Supply Co., Ltd. Convertisseur bidirectionnel isolé et son procédé de commande

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