WO2008065757A1 - Appareil et procédé permettant de compresser un courant d'appel d'excitation d'un transformateur - Google Patents
Appareil et procédé permettant de compresser un courant d'appel d'excitation d'un transformateur Download PDFInfo
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- WO2008065757A1 WO2008065757A1 PCT/JP2007/001328 JP2007001328W WO2008065757A1 WO 2008065757 A1 WO2008065757 A1 WO 2008065757A1 JP 2007001328 W JP2007001328 W JP 2007001328W WO 2008065757 A1 WO2008065757 A1 WO 2008065757A1
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- magnetic flux
- circuit breaker
- voltage
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
- H02H9/002—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H9/563—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle for multipolar switches, e.g. different timing for different phases, selecting phase with first zero-crossing
Definitions
- the present invention relates to a magnetizing inrush current suppressing device and method for suppressing magnetizing inrush current generated when a transformer is turned on.
- Non-Patent Document 1 (For example, see Non-Patent Document 1).
- Patent Document 1 JP-A-2002-751 45 “Gas Circuit Breaker with Excitation Current Suppressor”
- Non-Patent Document 1 IEEE Trans. Vol. 1 6, No. 2 2001 "Elimi nation of Transformer Inrush Currents by Controlled Switching -Part Theoretical Considerations"
- the residual magnetic flux of the transformer core is obtained by integrating the voltage. For example, in the case of Y connection, if the voltage between each terminal and the neutral point is measured and integrated, the residual magnetic flux of the transformer core can be accurately measured without being affected by the DC voltage. It can be calculated.
- a voltage measuring device that measures a voltage by dividing a high voltage into a low voltage, such as an instrument transformer (VT, PT) or a capacitor-type instrument transformer (PD), Connected between the ground.
- VT, PT instrument transformer
- PD capacitor-type instrument transformer
- What can be measured with such a voltage measuring device is the voltage to ground of each terminal of the transformer, and integrating that voltage will include the above DC voltage, and the integrated value will diverge. Accurate residual magnetic flux is not required.
- the present invention has been made in view of the prior art described above, and its purpose is to accurately calculate the residual magnetic flux when a transformer installed in an electric power system is interrupted by a circuit breaker.
- the transformer for the phase is turned on simultaneously with three single-phase circuit breakers or when it is turned on with a three-phase batch operation type circuit breaker, It is an object of the present invention to provide an apparatus and method for suppressing the inrush current of a transformer that can be suppressed without adding equipment such as a circuit breaker.
- the invention according to claim 1 is a three-phase circuit in which the primary winding is connected to the Y connection and the secondary winding or the tertiary winding is ⁇ -connected.
- the transformer inrush current suppression method that suppresses the excitation inrush current that occurs at the start of excitation by turning on each phase terminal of the transformer to a three-phase power supply with a three-phase circuit breaker.
- the steady-state magnetic flux of each phase of the transformer is calculated by integrating the phase voltage or line voltage on the primary side, secondary side, or tertiary side when AC voltage is applied in a steady state.
- phase and the magnitude of the residual magnetic flux of each phase of the transformer after the transformer is shut off are calculated, and the phase where the polarity of the steady magnetic flux of each phase of the transformer is the same as the polarity of the residual magnetic flux of each phase is 3
- the three-phase circuit breakers are turned on simultaneously To.
- each phase terminal of the three-phase transformer in which the primary winding is connected to the Y connection and the secondary winding or the tertiary winding is ⁇ -connected.
- the breaker is opened at least once, Sometimes, measure the relationship between the circuit breaker's breaking phase and the transformer's residual magnetic flux in advance from the voltage measured by the voltage measuring device connected to the primary, secondary, or tertiary terminal of the transformer.
- the residual magnetic flux of the transformer is estimated from the above relationship by controlling the opening phase of the breaker so that it always has the same breaking phase.
- a three-phase AC voltage is The three-phase circuit breakers are simultaneously turned on within the range where the phase of the steady magnetic flux of each phase when applied in the same state and the estimated phase of the residual magnetic flux of each phase are the same for three phases. It is characterized by this.
- the invention according to claims 18 to 21 is a three-phase transformation in which the primary winding is connected to the Y connection and the secondary winding or the tertiary winding is ⁇ -connected.
- Each phase end In the method for suppressing the excitation inrush current of the transformer that suppresses the excitation inrush current generated at the start of excitation by turning on the child to the three-phase power supply by the three-phase circuit breaker, the three-phase AC voltage is in a steady state in the transformer The voltage when applied at is measured to determine the steady magnetic flux between the lines, and the polarity and magnitude of the residual magnetic flux between each line of the transformer after the circuit breaker interrupts the transformer are calculated.
- the three-phase circuit breaker is turned on simultaneously when the phase where the polarity of the steady magnetic flux between each line and the phase of the residual magnetic flux between the lines is the same is in the range of three phases.
- the following different methods are adopted as methods for measuring the voltage and obtaining the steady magnetic flux between the lines.
- the primary phase voltage is measured and converted to a line voltage, and the line voltage is integrated to calculate a steady magnetic flux between the lines.
- the steady-state magnetic flux at each terminal of the transformer is calculated by measuring and integrating the phase voltage on the primary side, and the steady-state magnetic flux at each terminal of the transformer is converted into a steady-state magnetic flux between the lines.
- the steady-state magnetic flux between each line of the transformer is calculated by measuring and integrating the line voltage on the primary side.
- the steady magnetic flux between each line of the transformer is calculated by measuring and integrating the three relative ground voltages of the connected secondary winding or tertiary winding.
- each phase terminal of the three-phase transformer in which the primary winding is connected to the Y-connection and the secondary winding or the tertiary winding is ⁇ -connected to the three-phase
- the circuit breaker is opened at least once and then the transformer is transformed. Measure the relationship between the circuit breaker's breaking phase and the transformer's residual magnetic flux in advance from the voltage measured by the voltage measuring device connected to the primary, secondary, or tertiary terminal.
- the residual magnetic flux of the transformer is estimated from the above relationship by controlling the opening phase of the circuit breaker so that it always has the same breaking phase, and then the transformer is turned on.
- the three-phase AC voltage on the transformer is in steady state Apply a three-phase circuit breaker at the same time within the range where the phase of the steady magnetic flux between each line when applied and the phase of the estimated residual magnetic flux between each line are the same for three phases. It is characterized by.
- the residual magnetic flux when the transformer installed in the power system is interrupted by the circuit breaker is accurately calculated, and the three-phase transformer is used as a power source by three single-phase circuit breakers.
- the magnetizing inrush current that can be suppressed without adding equipment such as a breaker with a resistor when the power is turned on at the same time or when it is turned on with a three-phase batch operation type circuit breaker. Suppression devices and methods can be provided.
- FIG. 1 is a block diagram showing a connection relationship among a three-phase transformer, a three-phase circuit breaker, and a magnetizing inrush current suppressing device according to Embodiment 1 of the present invention.
- FIG. 2 is a waveform diagram showing the relationship between the three-phase power supply phase voltage, the steady-state magnetic flux of the three-phase transformer, and the residual magnetic flux of the transformer core in Embodiment 1 of the present invention.
- FIG. 3 Waveform diagram showing residual magnetic flux, applied phase, and applied magnetic flux when a single-phase transformer is applied with a single-phase circuit breaker.
- FIG. 4 Waveform diagram when the relationship between the power phase voltage, the steady magnetic flux of the transformer, and the residual magnetic flux of the transformer core is different from that in Fig. 1.
- FIG. 5 is a waveform diagram showing a relationship between a phase voltage, a steady magnetic flux, and a residual magnetic flux when a three-phase transformer is turned on in Embodiment 2 of the present invention.
- FIG. 6 is a waveform diagram showing the relationship between phase voltage, steady magnetic flux, and residual magnetic flux when the three-phase transformer is turned on in Embodiment 2 of the present invention.
- FIG. 7 is a waveform diagram showing the relationship between phase voltage, steady magnetic flux, and residual magnetic flux when the three-phase transformer is turned on in Embodiment 2 of the present invention.
- FIG. 8 is a waveform diagram showing the relationship between phase voltage, steady magnetic flux, and residual magnetic flux when the three-phase transformer is turned on in Embodiment 3 of the present invention.
- FIG. 9 is a waveform diagram showing the relationship between the phase voltage, steady magnetic flux, and residual magnetic flux when the three-phase transformer is turned on in Embodiment 3 of the present invention.
- FIG. 10 is a waveform diagram showing the relationship between phase voltage, steady magnetic flux, and residual magnetic flux when a three-phase transformer is turned on in Embodiment 3 of the present invention.
- FIG. 11 is a block diagram showing a connection relationship among a three-phase transformer, a three-phase circuit breaker, and a magnetizing inrush current suppressing device in Embodiment 4 of the present invention.
- FIG. 12 shows an example of calculation results of the breaking phase and residual magnetic flux of each phase when three single-phase transformers in Embodiment 4 of the present invention are connected to the Y connection _ ⁇ connection and disconnected by the circuit breaker. Figure.
- FIG. 13 is a block diagram showing a connection relationship among a three-phase transformer, a three-phase circuit breaker, and a magnetizing inrush current suppression device in Embodiment 6 of the present invention.
- FIG. 14 The three-phase power supply phase voltage and the steady-state magnetic flux of the three-phase transformer, the residual magnetic flux of the transformer core, the line voltage and the steady magnetic flux between the lines, and the residual between the lines in Embodiment 6 of the present invention
- the wave form diagram which shows the relationship of magnetic flux.
- FIG. 15 is a connection diagram showing a three-phase transformer of ⁇ _ ⁇ connection installed in an ineffective grounding system in Embodiment 6 of the present invention.
- FIG. 16 is a waveform diagram showing that a DC voltage is generated at the neutral point of the transformer after the three-phase transformer of FIG. 15 in Embodiment 6 of the present invention is cut off.
- FIG. 17 is a waveform diagram showing the setting of input target in the seventh embodiment of the present invention.
- FIG. 18 is a connection diagram showing a three-phase transformer of ⁇ _ ⁇ connection installed in an ineffective grounding system in Embodiment 7 of the present invention.
- FIG. 19 is a waveform diagram for explaining voltage changes in other phases when a single-phase circuit breaker is turned on in the three-phase transformer in FIG. 18 according to Embodiment 7 of the present invention.
- FIG.20 Three-phase power supply phase voltage and steady-state magnetic flux of three-phase transformer, residual flux of transformer core, line voltage and steady-state magnetic flux between lines, and residual between lines in Embodiment 7 of the present invention
- the wave form diagram which shows the relationship of magnetic flux.
- FIG. 21 is a waveform diagram showing the relationship between the phase voltage and line voltage on the primary side of the three-phase transformer and the ground voltage and line voltage on the secondary or tertiary ⁇ side in Embodiment 8 of the present invention.
- FIG. 22 shows the relationship between the phase voltage and line voltage on the primary ⁇ side of the three-phase transformer in Embodiment 8 of the present invention, and the ground voltage and line voltage on the secondary or tertiary ⁇ side. Waveform diagram showing a phase sequence relationship different from 1.
- FIG. 23 is a block diagram showing a connection relationship among the three-phase transformer, the three-phase circuit breaker, and the magnetizing inrush current suppressing device according to the ninth embodiment of the present invention.
- FIG. 24 shows an example of calculation results of the breaking phase and the residual magnetic flux between each line when three single-phase transformers in Embodiment 9 of the present invention are connected to the Y-connection and ⁇ -connection and interrupted by the circuit breaker. Figure.
- FIGS. 1 to 4 are diagrams for explaining the first embodiment.
- FIG. 1 is a block diagram showing a connection relationship between a three-phase transformer, a three-phase circuit breaker, and a magnetizing inrush current suppressing device.
- Fig. 2 is a waveform diagram showing the relationship between the power supply phase voltage, the steady-state magnetic flux of the transformer, and the residual magnetic flux of the transformer core
- Fig. 3 is the residual magnetic flux and the input phase when the single-phase transformer is turned on by a single-phase circuit breaker.
- Fig. 4 is a waveform diagram when the relationship between the power phase voltage, the steady-state magnetic flux of the transformer, and the residual magnetic flux of the transformer core is different from Fig. 1.
- 100 is a power system bus (also called a power bus), and 200 is a three-phase collective circuit breaker (three-phase circuit breaker) in which the main contacts of each phase are collectively operated.
- 3 0 0 is a three-phase transformer that is turned on or off by the three-phase circuit breaker 2 0 0 to the power bus 1 0 0, and its primary winding 3 0 1 and secondary winding 3 0 2 are Y-connected.
- the tertiary winding 3 0 3 is ⁇ -connected.
- Z n 1 and Z n 2 are impedances for grounding the neutral point of the primary winding 30 1 and secondary winding 30 2, respectively.
- the three-phase circuit breaker 200 may be a single-phase circuit breaker for each of the three phases, and the single-phase circuit breakers for each phase may be turned on or off simultaneously for three phases.
- the single-phase circuit breakers for each phase may be turned on or off simultaneously for three phases.
- the single-phase circuit breakers for each phase
- 4 0 0 is a power supply voltage measuring device composed of VT or the like for measuring the voltage (U, V, W) of each phase of the power bus 1 0 0, and 5 0 0 is a three-phase transformer 3 Primary phase of 0 0 (U, V, W) Transformer composed of VT etc. for measuring terminal voltage Terminal voltage measuring equipment 6 0 0 is the main contact of circuit breaker 2 0 0 Is a closing control device that outputs a closing command, and constitutes an inrush current suppression device. [0022] In the input control device 6 0 0, 6 0 1 is a power source for measuring the power supply voltage of each phase (U, V, W phase) output from the power supply voltage measuring device 4 0 0 such as VT.
- a voltage measuring means 60 2 is a steady magnetic flux calculating means for calculating a steady-state magnetic flux for each phase by integrating each phase voltage measured by the power supply voltage measuring means 60 1.
- 6 0 3 is a transformer terminal voltage measuring device that takes in and measures the transformer terminal voltage of each phase (U, V, W phase) output from 500 0
- Stage 6 0 4 is a residual magnetic flux calculating means for calculating the residual magnetic flux of the iron core of the transformer for each phase by integrating each phase voltage measured by the transformer terminal voltage measuring means 60 3. It is.
- 6 0 5 inputs the output signal of the steady magnetic flux calculating means 6 0 2 and the output signal of the steady magnetic flux calculating means 6 0 4 for each phase (U, V, W phase), Transformer Phase detection means for detecting the phase where the residual magnetic flux of the iron core has the same polarity.
- 6 06 inputs the output signal of this phase detection means 6 05 for three phases so that the main contact of the circuit breaker 2 0 0 is electrically turned on within the range in which the logical product of the three phases is established.
- This is a closing instruction output means for outputting a closing instruction to the operating mechanism that drives the main contact of the breaker 200.
- reference numerals 1 to 3 denote power source phase (U, V, W phase) voltages measured by the power source voltage measuring means 60 1. 4 to 6, each of which is calculated by integrating the voltage measured by the power source voltage measuring means 6 0 1 by the steady magnetic flux calculating means 6 0 2 when a three-phase voltage is applied to the transformer in a steady state.
- Phase (U, V, W phase) The steady magnetic flux of the iron core. 7 to 9 represent transformer phases (U, V, W phases) calculated by integrating the voltage measured by the transformer terminal voltage measuring means 60 3 by the residual magnetic flux calculating means 60 4. It is a residual magnetic flux.
- the residual magnetic flux 7 of the transformer U-phase iron core is positive and has the largest residual magnetic flux
- the residual magnetic flux 8 of the V-phase iron core and the residual magnetic flux 9 of the W-phase iron core are negative and negative.
- the phases of the residual magnetic flux 7 and the steady magnetic flux 4 of the iron core are in the phase range indicated by 10.
- the residual magnetic flux 8 and the steady magnetic flux 5 have the same polarities in the range of 11.1
- the residual magnetic flux 9 in the iron core and the stationary magnetic flux 6 have the same polarity. Is in the range of 1.
- phase ranges 10, 11, and 12 in which the polarities of the residual magnetic flux and the steady magnetic flux coincide with each other are detected by the phase detection means 60 5.
- the phase range in which the polarities of the steady magnetic flux and the residual magnetic flux coincide with each other in the three phases is the range shown in 13, and the phase ranges 10, 11, and 12
- the AND condition is obtained by the logical product of the signals output from the phase detection means 60 5 for each phase.
- This phase range 13 is the input target phase range of the 3-phase circuit breaker 200.
- Figure 3 is a waveform diagram showing the residual magnetic flux, the applied phase, and the applied magnetic flux when the single-phase transformer is applied with a single-phase circuit breaker.
- 15 shows the steady magnetic flux when the power supply voltage 14 is constantly applied to the transformer.
- the phase is 90 ° behind the phase of the voltage.
- this input phase is a condition in which the magnetizing inrush current flows to the maximum when the residual magnetic flux of the transformer is zero.
- the transformer has a residual magnetic flux of 17 and the circuit breaker is turned on at a phase of 180 °, the magnetic flux is 18 and the maximum value is 2 pu + the residual magnetic flux of 17 .
- the difference between the maximum values of magnetic flux 1 8 and magnetic flux 1 6 is equivalent to the residual magnetic flux 1 7, but the current-flux characteristic of the transformer core is a saturation characteristic.
- the magnitude of the excitation inrush current is significantly greater than the difference in the residual magnetic flux 17 under the magnetic flux 18 condition compared to the magnetic flux 16 condition.
- 19 is the magnetic flux when the residual magnetic flux is 17 and the phase is applied at 90 °.
- the maximum value of magnetic flux in this case is 1 PU + residual magnetic flux 17 .
- the maximum value of the magnetic flux after being turned on will be at least less than 2 pu.
- the magnetic flux is never larger than 16.
- the magnitude of the inrush current will be 0 However, it can be made smaller than the maximum magnetizing inrush current that flows when the breaker 200 is turned on.
- a secondary or tertiary winding is ⁇ -connected, and in the example of Fig. 1, the tertiary winding is ⁇ -connected.
- the sum of the residual magnetic flux for each phase after the three-phase transformer 3 0 0 is shut off by the circuit breaker 2 0 0 is always 0 due to the secondary or tertiary winding being wound. Therefore, if the residual magnetic flux of one phase with a three-phase transformer is the largest in the positive polarity, for example, the residual magnetic fluxes in the other two phases are both negative values, or the one phase is the negative and the largest, the remaining One phase of is zero.
- Fig. 2 shows the relationship between the residual magnetic fluxes in the three-phase transformer, that is, the sum of the residual magnetic fluxes of the three phases is 0, the residual magnetic flux of the U phase is positive and the maximum, and the residual magnetic fluxes of the other two phases are Both have negative polarity values.
- the residual magnetic flux 7 and the steady magnetic flux 4 have the same polarity in the range of 10. Therefore, if the circuit breaker 2 0 0 is turned on in the phase range 1 0, at least the U-phase excitation inrush current can be made smaller than the maximum excitation inrush current in the residual magnetic flux 0.
- the residual magnetic fluxes of the V and W phases are negative values.
- the residual magnetic flux 8 and the steady magnetic flux 5 have the same polarity in the phase range 11.
- the residual magnetic flux 9 and the steady magnetic flux 6 have the same polarity in the phase range 12.
- phase range 13 the phase range 10 in which the U-phase residual magnetic flux 7 and the stationary magnetic flux 4 have the same polarity, and the phase range in which the V-phase residual magnetic flux 8 and the stationary magnetic flux 5 have the same polarity. 1 All the phase ranges 1 and 2 where the residual magnetic flux 9 and the steady magnetic flux 6 of the 1 and W phases have the same polarity overlap. Therefore, if the three breakers are turned on simultaneously within the phase range 13, the magnetizing inrush current can be suppressed for all three phases.
- FIG. 4 assumes a condition in which the residual magnetic flux of one phase is 0 and the other two phases are maximum in positive polarity and negative polarity.
- the phase where the value of residual magnetic flux 9 is 0 is the W phase. Since the residual magnetic flux 9 in the W phase has a value of 0, the phase at which the stationary magnetic flux 6 and the residual magnetic flux 9 have the same polarity may be set to _180 ° to 0 ° or 0 ° to 180 °.
- phase range in which the three-phase residual magnetic flux and the steady magnetic flux all have the same polarity is 20 or 2 1. Therefore, if the breaker 2 0 0 is turned on simultaneously for 3 phases within the phase range 2 0 or 2 1, the magnetizing inrush current can be suppressed for all 3 phases.
- the three-phase transformer used in the power system has a secondary or tertiary winding that is ⁇ -connected, so after the three-phase transformer 3 0 0 is shut off by the circuit breaker 2 0 0 The sum of the residual magnetic flux of each phase is always 0 due to the ⁇ connection. This is not affected by the grounding method at the neutral point of the primary Y-connection.
- the input phase range 13 can be set, and the three-phase batch operation type
- the transformer 300 is turned on by the circuit breaker 200 or by simultaneous operation of single-phase circuit breakers for each of the three phases, it is possible to suppress the magnetizing inrush current by the closing phase control method described above. Needless to say.
- FIGS. 5 to 7 are diagrams for explaining the second embodiment.
- FIGS. 5 to 7 are waveform diagrams showing the relationship between the phase voltage, the steady magnetic flux, and the residual magnetic flux when the three-phase transformer is turned on. It is assumed that the remaining magnetic flux remains different.
- the connection relationship between the three-phase transformer, the three-phase circuit breaker, and the magnetizing inrush current suppression device is the same as that in the first embodiment, so the block diagram corresponding to FIG. Omitted.
- the intersection 22 of the steady magnetic flux and the residual magnetic flux is set as the input target point of the three-phase circuit breaker 200.
- the input control device 6 0 0 is set as follows.
- Fig. 5 shows that the residual magnetic flux 7 of U phase is the maximum with the positive polarity, and the residual magnetic fluxes 8 and 9 of V phase and W phase are both under the condition that the sum of the residual magnetic flux of each phase of the three-phase transformer is 0. Since the values differ depending on the negative polarity and there is a relationship of residual magnetic flux 8> residual magnetic flux 9, the W phase is the smallest phase of the residual magnetic flux. Therefore, in the case of Fig. 5, the closing target point of the 3-phase circuit breaker 200 is set with the intersection 22 of the steady magnetic flux 6 and the residual magnetic flux 9 in the W phase as the breaker closing target point.
- FIG. 6 shows the case where the U and V phase residual magnetic fluxes are maximum for positive polarity and negative polarity, respectively, and the W phase is 0.
- the W phase is the phase with the smallest residual magnetic flux
- the intersection 22 of the steady magnetic flux 6 and residual magnetic flux 9 in the W phase is taken as the breaker closing target point, and the closing target point of the three-phase breaker 2 0 0 Set.
- FIG. 7 shows the case where the residual magnetic fluxes 8 and 9 in the V and W phases are 1/2 of the U-phase residual magnetic flux 7.
- the residual magnetic flux 8 of the V phase and the residual magnetic flux 9 of the W phase are clearly distinguished and drawn so that the residual magnetic flux does not overlap.
- the target point for closing the three-phase circuit breaker 2 0 0 is set with the intersection 22 of the steady magnetic flux 6 and residual magnetic flux 9 in the W phase as the circuit breaker charging target point.
- the breaker closing target point 2 2 is in the closing target phase range 1 3 (_30 ° to 30 °) shown in FIG. In both cases, the difference between the residual magnetic flux of each phase and the steady magnetic flux is reduced.
- the difference between the steady magnetic flux and the residual magnetic flux of each phase can be reduced, and the transformer 3 0 0 is excited by turning on the 3-phase circuit breaker 2 0 0 at the closing target point 2 2. By doing so, it is possible to suppress a large excitation inrush current from flowing.
- FIGS. 8 to 10 are diagrams for explaining the third embodiment.
- Figs. 8 to 10 are waveform diagrams showing the relationship between the phase voltage, steady magnetic flux, and residual magnetic flux when the three-phase transformer is turned on, assuming that the residual magnetic flux remains different. Yes.
- the connection relationship among the three-phase transformer, the three-phase circuit breaker, and the excitation inrush current suppressing device is the same as in the first and second embodiments described above. The block diagram is omitted.
- the steady-state magnetic flux in the phase with the largest residual magnetic flux when the three-phase transformer is turned on, the steady-state magnetic flux has a peak value, that is, the phase voltage 0 point advanced by 90 ° from the steady-state magnetic flux.
- the closing control device 6 0 0 is set to be the closing target point of the circuit breaker 2 0 0.
- the appearance of the residual magnetic flux in FIGS. 8 to 10 is the same as that in FIGS.
- Figure 8 shows that the U-phase residual magnetic flux 7 is the largest in the positive polarity, and the V and W-phase residual magnetic fluxes 8 and 9 are both negative. Since the relationship is residual magnetic flux 7> residual magnetic flux 8> residual magnetic flux 9, the U phase is the phase with the largest residual magnetic flux. Therefore, in the case of Fig. 8, the crest value of the steady magnetic flux 4 in the U phase is set as the breaker closing target point 2 3 and the closing target of the 3 phase breaker 2 0 0 Set a point.
- the U and V phase residual magnetic fluxes are maximum for positive polarity and negative polarity, respectively, and the W phase is 0.
- the U phase is the phase with the largest residual magnetic flux
- the target value of the three-phase circuit breaker 200 is set with the crest value of the steady magnetic flux 4 in the U phase as the circuit breaker input target point 23.
- FIG. 10 shows the case where V and W phase residual magnetic fluxes 8 and 9 assume 1/2 of U phase residual magnetic flux 7.
- the residual magnetic flux 8 of V phase and the residual magnetic flux 9 of W phase are drawn so that the residual magnetic flux does not overlap consciously for easy understanding.
- the target value of the three-phase circuit breaker 200 is set by setting the peak value of the steady magnetic flux 4 in the U-phase as the circuit breaker closing target point 23.
- the breaker closing target point 23 is within the closing target phase range 13 shown in FIG. The difference from the magnetic flux is reduced.
- the difference between the steady magnetic flux and the residual magnetic flux of each phase can be reduced.
- the three-phase circuit breaker 200 can be turned on to excite the transformer 300. If so, it is possible to suppress a large excitation inrush current.
- FIG. 11 to FIG. 12 are diagrams for explaining the fourth embodiment.
- FIG. 11 is a block diagram showing a connection relationship among a three-phase transformer, a three-phase circuit breaker, and an excitation inrush current suppressing device.
- Fig., Fig. 1 2 shows the residual magnetic flux when three single-phase transformers are connected to Y connection _ ⁇ connection, and the transformer for the three phases is interrupted by the circuit breaker. It is a figure which shows the example calculated
- the power system configuration is the same as in Fig. 1, but the difference from Fig. 1 is that the secondary winding 3 0 2 of transformer 3 0 0 is ⁇ -connected, and transformer 3 In the normal operation state of 0 0, when the transformer terminal voltage measuring device 5 0 0 is not installed in any of the primary side terminal, secondary side terminal or tertiary side terminal, the primary side terminal Temporary connection transformer terminal voltage measuring device 5 0 0 A is connected and the output voltage is input. ⁇ Opening control device 6 0 0 A transformer terminal voltage measuring means 6 0 3 is input. In the point.
- This closing / opening control device 6 0 0 A is provided in place of the closing control device 6 0 0 of the first embodiment, and constitutes an inrush current suppression device.
- the components from the means 6 0 1 to the input command output means 6 0 6 are the same as those of the input control device 6 0 0 of the first embodiment, but the breaking phase ⁇ residual magnetic flux relation measurement holding means 6 0 7, An opening phase control means 6 0 8 and an opening command output means 6 0 9 are added.
- Breaking phase ⁇ Residual magnetic flux related measuring and holding means 6 0 7 is a transformer terminal voltage measuring device 5 0 OA is temporarily connected at least once (generally multiple times) with OA temporarily connected.
- the voltage cutoff phase output from the transformer terminal voltage measuring means 60 3 and the magnetic flux signal output from the residual magnetic flux calculating means 6 0 4 are input, and the relationship between the cutoff phase and the residual magnetic flux is determined. It has the function to measure and hold.
- the opening phase control means 6 0 8 inputs the output of the power supply voltage measuring means 6 0 1 and the output of the interrupting phase / residual magnetic flux relation measurement holding means 6 0 7 to determine the opening phase of the main contact. It has a function to control.
- the opening command output means 6 09 is a function for receiving an output signal from the opening phase control means 6 08 and outputting an opening instruction to the operating mechanism that drives the main contact of the circuit breaker 20 00. It has.
- FIG. 6 is a diagram showing the residual magnetic flux obtained when 0 is interrupted by the circuit breaker 2 0 0 by calculation while changing the interruption phase.
- the transformer terminal voltage measuring device 5 0 0 can be connected to any of the primary terminal, the secondary terminal, or the tertiary terminal.
- the circuit breaker 20 0 is shut off at least once (generally multiple times) with the OA temporarily connected to the transformer terminal voltage measuring device, equivalent to Fig. 12
- the characteristics of the residual magnetic flux of each phase of the transformer with respect to the breaking phase of the breaker to be measured are measured in advance. 2 4 in the figure indicates that the residual magnetic flux of one phase is maximized.
- the transformer terminal voltage measuring device 5 0 0 A is temporarily connected to measure the characteristics of the residual magnetic fluxes 7 ', 8' and 9 ', and is removed in the normal operation state.
- a transformer terminal voltage measuring device 5 0 0 A may be installed permanently. Since it is only necessary to obtain the relationship between the breaking phase and the residual magnetic flux, it is not always necessary to measure the residual magnetic flux characteristics in detail as shown in Fig. 12.
- the opening command output means 6 0 9 controls the opening phase of the circuit breaker so that the interruption phase is always the same. Shut off. As a result, it is possible to estimate that the residual magnetic flux of each phase is 24, for example, from the characteristics of the residual magnetic flux corresponding to Fig. 12 measured in advance.
- the circuit conditions of the power system (in the case of Fig. 1 1, the circuit conditions from the power system 1 0 0 to the transformer 3 0 0 ) Is always the same, so if the phase when the breaker 2 0 breaks is always the same, the residual magnetic flux value of each phase of the transformer 3 0 0 must always be the same.
- the steady magnetic flux of the transformer that is, the magnetic flux when a voltage is applied to the transformer in a steady state, is also obtained by integrating the voltage measured by the power supply voltage measuring device installed on the bus or the like. be able to.
- the transformer terminal voltage measuring device 5 0 OA for temporary connection is connected to the primary terminal of the transformer 300. Connecting and turning on the output voltage ⁇ Opening control device 60 0
- the present invention is not limited to this, and the transformer 3 0 It can also be applied when voltage measurement equipment is connected to any of the primary, secondary, and tertiary terminals in the 0 operating state.
- the means for obtaining the relationship between the breaker phase of the breaker and the residual magnetic flux of the transformer is not necessarily built in the synchronous switching controller 60OA of FIG. Obtain the relationship between the breaker's breaking phase and the transformer's residual magnetic flux at another unit Even if only the synchronous opening / closing control device 60 OA is stored, the same effect can be obtained.
- a transformer voltage is measured with a general-purpose measuring instrument using a VT that is already installed or a VT that is temporarily connected, and the circuit breaker phase and the transformer phase are determined from the measured data. It is generally considered that the relationship of residual magnetic flux is calculated using a personal computer.
- FIGS. 13 to 16 are diagrams for explaining the sixth embodiment.
- FIG. 13 is a block diagram showing a connection relationship between the three-phase transformer, the three-phase circuit breaker, and the magnetizing inrush current suppressing device.
- Figure 14 is a waveform diagram showing the relationship between the power supply phase voltage and the transformer's steady magnetic flux, the transformer core's residual flux, the line voltage and the steady flux between the lines, and the residual flux between the lines
- Fig. 1 Fig. 5 is a connection diagram showing a three-phase transformer with ⁇ _ ⁇ connection installed in an ineffective grounding system.
- Fig. 16 shows a DC at the neutral point on the transformer ⁇ side after the three-phase transformer in Fig. 15 is shut off. It is a wave form diagram which shows that a voltage appears.
- the connection relationship of the three-phase transformer, the three-phase circuit breaker, and the magnetizing inrush current suppression device is the same as in the first to third embodiments described above, but is different from the first to third embodiments.
- the closing control device 6 00 constituting the excitation inrush current suppressing device instead of the steady magnetic flux calculating means 6 0 2 for calculating the steady-state magnetic flux for each phase, the steady-state magnetic flux for calculating the steady-state magnetic flux between the lines is calculated.
- residual magnetic flux calculating means 6 0 4 A for calculating residual magnetic flux between lines is provided. There is in point.
- the steady magnetic flux calculating means 6 0 2 A integrates the power supply voltage of each phase (U, V, W phase) measured by the power supply voltage measuring means 6 0 It is a means to calculate the magnetic flux of each phase and convert the magnetic flux of each phase into the magnetic flux between lines.
- the residual magnetic flux calculation means 60 04 A integrates the transformer terminal voltage of each phase (U, V, W phase) measured by the transformer terminal voltage measurement means 60 3, so that each terminal of the transformer It is a means to calculate the residual magnetic flux of and convert it to the residual magnetic flux between the lines.
- each phase voltage measured by the power supply voltage measuring means 6 0 1 is converted into a line voltage by the steady magnetic flux calculating means 6 0 2 A, and integrated to obtain a magnetic flux between the lines. You may ask for.
- each phase voltage measured by the transformer terminal voltage measuring means 6 0 3 is converted into a line voltage by the residual magnetic flux calculating means 6 0 4 A, and integrated to convert the magnetic flux between the lines. You may ask for it.
- some voltage measuring devices such as VT have a function of converting a ground voltage into a line voltage in the device, so such a voltage measuring device is installed.
- the line voltage is measured by the transformer terminal voltage measurement means 63, so the residual magnetic flux is calculated.
- the means 6 0 4 A may integrate the line voltage to obtain the magnetic flux between the lines.
- the phase detecting means 6 0 5 , VW, and WU phases Input the steady magnetic flux calculation means 60 2 A output signal and the steady magnetic flux calculation means 6 0 4 A output signal so that the steady magnetic flux and the residual magnetic flux between the transformer lines are the same. Detect the phase that becomes polar.
- the input command output means 6 0 6 inputs the output signal of this phase detection means 6 0 5 for 3 lines (UV, VW, WU phase) and breaks the circuit breaker 2 within the range where the logical product for 3 lines is established.
- a closing command is output to the operating mechanism that drives the main contact of the circuit breaker 2 0 0 so that the 0 0 main contact is electrically turned on.
- reference numerals 1 to 3 denote power supply phase (U, V, W phase) voltages measured by the power supply voltage measuring means 6 0 1. 4 to 6, when the three-phase voltage 1 to 3 is applied to the transformer in the steady state, the voltage is integrated by the steady magnetic flux calculation means 6 0 2 A The steady-state magnetic flux of each phase of the transformer (u, V, W phase) calculated as above.
- 3 1 to 3 3 are the voltages between the lines (between UV, VW, and WU) obtained by converting the three-phase voltages 1 to 3 by the steady magnetic flux calculation means 6 0 2 A
- 3 4 to 3 6 are The magnetic flux between each line obtained by integrating the line voltage 3 1 to 3 3 by the steady magnetic flux calculating means 60 2 A or by converting the steady magnetic flux 4 to 6 of each phase. is there.
- 3 7 to 39 are residual magnetic fluxes between transformer lines (between U V, VW and W U) calculated by the residual magnetic flux calculating means 60 4 A.
- the residual magnetic flux 3 7 between the transformer UVs is positive and has the maximum value
- the residual magnetic flux 3 8 between VW and the residual magnetic flux 3 9 between WU are negative and the same. Indicates the value status.
- the residual magnetic flux 38 between VW and the residual magnetic flux 39 between WU are clearly distinguished so that they are intentionally drawn so that they do not overlap.
- each phase of transformer (U, V, W phase)
- the residual magnetic flux 7-9 of the iron core is the distance between each transformer line (between UV, VW, WU) calculated by residual magnetic flux calculation means 6 0 4 A )
- residual magnetic flux 3 7 to 3 9 or residual magnetic flux 3 7 to 3 9 between transformer wires (between UV, VW and WU) is calculated using residual magnetic flux calculation means 6 0 4 A Therefore, it is obtained by integrating and calculating each phase voltage 1-3.
- phase range 40 is the input target phase range of the three-phase circuit breaker 20 0.
- the transformer primary ground voltage is integrated to calculate the residual magnetic flux of each phase iron core, and the residual magnetic flux and the steady magnetic flux of each phase are shown in Fig. 14.
- Find the range 4 2 (corresponding to range 1 3 in Fig. 2 and range 2 0 and 2 1 in Fig. 4) where the residual magnetic flux and steady-state magnetic polarity of each phase are the same for all three phases. It was shown that if a three-phase circuit breaker 200 is used as the target phase range, a large magnetizing inrush current can be suppressed.
- the input target phase range 40 set from the magnetic flux between the lines in Fig. 14 Within the range 4 2 '' where the polarities of the residual magnetic flux and the steady magnetic flux are the same for all three phases, and in this target phase range 40, the three-phase circuit breaker 2 0 0 is turned on to excite the transformer 3 0 0 By doing so, a large magnetizing inrush current can be suppressed.
- Fig. 16 shows the transformer primary voltage when the primary side is Y-connected and the neutral point is ungrounded with a three-phase circuit breaker 200, as shown in Fig. 15. It shows the magnetic flux calculated by integrating the ground voltage, the line voltage, and the magnetic flux calculated by integrating the voltage.
- the DC voltage 43 is integrated in order to calculate the residual magnetic flux after the interruption, so the residual magnetic flux of each phase 7 ⁇ 9 increases with time and eventually diverges. For this reason, it is clear that the residual flux cannot be calculated accurately by calculating the residual flux by integrating the terminal voltage.
- the line voltage between UVs is obtained by subtracting the V relative ground voltage from the U relative ground voltage.
- the ground voltage of each phase of the transformer primary after circuit breaker breaking is the same level of DC voltage. For this reason, the influence of this DC voltage does not appear in the line voltages 31 to 33 calculated by subtracting the primary ground voltage. Integrating such line voltage 3 "! ⁇ 3 3 as shown in Fig. 16 as residual magnetic flux 3 7 ⁇ 3 9 between lines
- the magnetic flux does not diverge, an accurate residual magnetic flux can be obtained without being affected by the DC voltage 22. Therefore, if the line voltage is integrated to obtain the relationship between the steady magnetic flux and the residual magnetic flux, even if a DC voltage is generated at the neutral point after the transformer is shut off, the circuit breaker is not affected by the DC voltage.
- the input phase can be determined.
- the line voltage is the difference between the ground voltages as described above, and the magnetic flux is the product of the voltages. Therefore, even if the ground voltage is converted into line voltage and then integrated to calculate the magnetic flux, or the ground voltage is integrated to calculate the magnetic flux of each phase and the magnetic flux is differentiated, Needless to say, the residual magnetic flux between the lines can be calculated without being affected by the DC voltage at the neutral point.
- 1 0 1 indicates the power system
- 1 0 2 indicates the power source side neutral point impedance.
- there is no impedance at the transformer neutral point but there may be an impedance connected to the transformer neutral point in a non-effective grounding system.
- the impedance connected to the neutral point is often a resistor having a large value, and even in this case, since a DC voltage appears at the neutral point of the transformer, the same effect can be obtained by the first embodiment.
- FIG. 17 to FIG. 20 are diagrams for explaining the seventh embodiment.
- FIG. 17 shows the waveform of FIG. The shape is deleted.
- Fig. 18 is a connection diagram showing a ⁇ - ⁇ connection three-phase transformer installed in the non-effective grounding system, and
- Fig. 19 shows a one-phase circuit breaker when the three-phase transformer shown in Fig. 18 is turned on. It is a figure explaining the voltage change of the other phase after putting only.
- Figure 20 is a waveform diagram showing the relationship among the power supply phase voltage, line voltage, steady magnetic flux, and residual magnetic flux when the three-phase transformer is turned on.
- connection relationship among the three-phase transformer, the three-phase circuit breaker, and the magnetizing inrush current suppression device is the same as that in the sixth embodiment described above, and therefore a block diagram corresponding to FIG. Is omitted.
- the steady magnetic flux has the maximum value in the range where the polarities of the steady magnetic flux and the residual magnetic flux coincide between the lines with the largest residual magnetic flux among the lines of the three-phase transformer 300.
- the closing control device 6 0 0 is set so that the point, that is, the voltage zero point 41 between the lines, becomes the closing target point of the 3-phase circuit breaker 2 0 0.
- reference numeral 47 denotes a break generation voltage when the circuit breaker 200 is turned on.
- a pre-discharge called pre-arc occurs before the circuit breaker contacts are mechanically contacted, and the circuit may be turned on electrically.
- the voltage at which pre-arcing occurs increases as the distance between the contacts increases. Therefore, as shown in Fig. 17, the pre-arcing voltage 47 when the circuit breaker is turned on decreases along the time axis.
- the voltage generated by such a break shows a variation 48.
- the setting condition of the closing target point 41 in FIG. 17 indicates that the breaker can be electrically turned on at the peak value of the W-phase breaker interelectrode voltage 4 6.
- the values of the U-phase and V-phase circuit breaker pole voltages 45, 46, which are the other phases, are 0.5 p.U.
- the U-phase and V-phase charging times are delayed, and the circuit breaker is not switched on simultaneously for the three phases.
- FIG. 19 a 3.3 kV_ 4 1 5 V—30 O kVA transformer is illustrated.
- FIG. 20 is a waveform diagram showing the circuit breaker injection target when the state of the residual magnetic flux is set to a condition different from that in FIG.
- the residual magnetic flux between UV 3 7 is positive and maximum
- the residual magnetic flux between VW 3 8 is 0,
- the residual magnetic flux between WU 3 9 is negative
- its absolute value is the residual magnetic flux between UV 3 Same condition as 7.
- the input target point 41 is set by the residual magnetic flux 37 between UV and the steady magnetic flux 34 between UV.
- the closing target point 4 1 ′ is set by the residual magnetic flux 39 between W U and the steady magnetic flux 36 between W U.
- the W relative ground voltage 3 has a peak value, which means that the breaker W-phase interpole voltage has a peak value.
- the V relative ground voltage has a peak value, which means that the voltage between the breaker V-phase poles has a peak value. That is, it is clear that the time difference between the three circuit breaker phases can be reduced as described above, regardless of whether the target points 4 1 and 4 1 ′ are input targets.
- the seventh embodiment it is possible to reduce the charging variation of each phase when the circuit breaker is turned on, and at this charging target point 41, the three-phase circuit breaker 2 0 0 is turned on to excite the transformer 3 0 0. By doing so, it is possible to suppress a large excitation inrush current from flowing.
- FIGS. 21 to 22 are diagrams for explaining the eighth embodiment.
- the connection relationship between the three-phase transformer, the three-phase circuit breaker, and the magnetizing inrush current suppressing device is the same as in the sixth and seventh embodiments described above.
- the block diagram is omitted. [0106] (Configuration)
- the primary side line voltage is measured by measuring the ground voltage on the secondary or tertiary ⁇ connection side. It is what.
- Figure 21 shows the case where the phase sequence relationship between the Y side and the ⁇ side is +30 degrees.
- the ⁇ side W relative ground voltage 5 6 is opposite to the primary Y side V W line voltage 3 2 in the direction of the vector.
- the relationship between ⁇ side relative ground voltage 5 5 and Y side U V line voltage 3 1, and ⁇ side re relative ground voltage 5 4 and Y side W U line voltage 3 3 is the same. That is, if the ground voltage on the ⁇ side is measured and the polarity of the voltage is reversed for all three phases, the phase will be the same as the line voltage on the primary Y side.
- the DC voltage (4 3 in Fig. 16) that appears at the neutral point after the transformer is shut off is a zero-phase voltage, and it is clear from the symmetric coordinate method that it does not affect the ⁇ side. is there. Therefore, by measuring and integrating the ⁇ side ground voltage, the same result as that obtained by integrating the primary Y side line voltage and calculating the magnetic flux was obtained, as shown in Fig. 14, Fig. 17, and Fig. 20.
- the target point 41 can be set as follows.
- Fig. 21 shows the force when the phase order relationship between the Y side and the ⁇ side is +30 degrees. The same effect is obtained when the phase order relation is 130 degrees as shown in Fig. 22. It goes without saying that you can get it.
- the heel side relative ground voltage 5 5 is the vector with the primary Y side UV line voltage 3 1 Are in the same direction.
- the relationship between ⁇ side U relative ground voltage 5 4 and Y side W U line voltage 3 3 and ⁇ side W relative ground voltage 5 6 and Y side VW line voltage 3 2 are also the same. Therefore, if the ground voltage on the ⁇ side is measured and the voltage is the same polarity for all three phases, the phase will be the same as the line voltage on the primary Y side.
- the eighth embodiment even when no voltage divider is installed on the primary side of the transformer, it is possible to calculate the magnetic flux between each line on the primary side and to set the circuit breaker input target. Therefore, it is possible to suppress a large excitation inrush current from flowing.
- the DC voltage 4 3 appearing in the transformer primary ground voltage shown in Fig. 6 is a zero-phase voltage, so add the three-phase ground voltage, and then reduce it to one third to obtain the original ground voltage. By subtracting from the voltage, the DC voltage of the ground voltage can be made zero. Needless to say, if the magnetic flux is calculated and the breaker input target is set, a large magnetizing inrush current can be suppressed without the influence of the DC voltage appearing at the neutral point.
- FIGS. 23 to 24 are diagrams for explaining the ninth embodiment.
- FIG. 23 is a block diagram showing a connection relationship among the three-phase transformer, the three-phase circuit breaker, and the magnetizing inrush current suppressing device.
- Figure 24 shows the connection of three single-phase transformers to Y connection _ ⁇ connection, and the residual magnetic flux between the lines when the transformer for the three phases is interrupted with a circuit breaker. It is a figure which shows the example calculated
- Fig. 23 the power system configuration is the same as in Fig. 13. However, the difference from Fig. 13 is that the secondary winding 3 0 2 of transformer 3 0 0 is ⁇ -connected, and When the transformer terminal voltage measurement device 5 0 0 is not installed in the primary side terminal, secondary side terminal, or tertiary side terminal in the normal operation state of 300, Transformer terminal voltage measuring device for temporary connection 5 0 0 A is connected and its output voltage is input. ⁇ Opening control device 6 0 0 A voltage measurement means 6 0 3 is there. As a modification, a transformer terminal voltage measuring device 50 O A may be connected to the secondary or tertiary terminal.
- This closing / opening control device 6 0 0 A is provided in place of the closing control device 6 0 0 of the sixth embodiment, and the power supply voltage measuring means 6 0 1 to the closing command output means 6 0
- the components up to 6 are the same as those of the closing control device 6 0 0 of the embodiment 6, but the breaking phase ⁇ remaining magnetic flux relation measurement holding means 6 0 7, opening phase control means 6 0 8 and opening command Addition of output means 6 0 9 makes it possible to input the fourth embodiment.
- Opening control device The configuration is in accordance with 6 0 0 A.
- the opening control device 6 0 0 A of the ninth embodiment is the same as the closing control device 6 0 OA of the fourth embodiment.
- a steady magnetic flux calculation means 6 0 2 A for calculating the magnetic flux in the steady state between the lines
- a residual magnetic flux calculation means 6 for calculating the residual magnetic flux for each phase 6
- a residual magnetic flux calculating means 6 0 4 A for calculating the residual magnetic flux between the lines is provided.
- FIG. 5 is a diagram in which the residual magnetic flux between lines when 0 0 is interrupted by a circuit breaker 2 0 0 is obtained by calculation while changing the interruption phase.
- transformer terminal voltage measuring device 5 0 can be connected to any of the primary side terminal, the secondary side terminal, or the tertiary terminal.
- transformer terminal voltage measuring device 5 0 Break off circuit breaker 2 0 0 at least once (generally multiple times) with OA temporarily connected. Measure the characteristics of the residual magnetic flux between each transformer line in advance with respect to the breaking phase of the corresponding breaker.
- the transformer terminal voltage measuring device 5 0 O A is connected to measure the characteristics of the residual magnetic flux between the lines corresponding to Fig. 24, and removed in the normal operation state.
- a transformer terminal voltage measuring device 50 O A may be permanently installed. Since it is only necessary to obtain the relationship between the interrupting phase and the residual magnetic flux, it is not always necessary to measure the residual magnetic flux characteristics in detail as shown in Fig. 24.
- the opening command output means 6 0 9 controls the opening phase of the circuit breaker so that the interruption phase is always the same. Shut off. This makes it possible to estimate the residual magnetic flux between each line from the characteristics of the residual magnetic flux corresponding to Fig. 24 measured in advance.
- the circuit conditions of the power system in the case of Fig. 2 3, from the power system 1 0 0 to the transformer 3 0 0 Since the circuit conditions are always the same, if the phase when the breaker 2 0 breaks is always the same, the residual magnetic flux between the transformers 3 0 0 should always be the same. .
- the information on the residual magnetic flux after the circuit breaker shuts off the transformer has been clarified in advance by the measurement that temporarily connected the voltage measuring device, so even if the transformer terminal voltage cannot be measured every time the circuit breaker is turned on, The relationship between the residual magnetic flux and the steady magnetic flux can be obtained, and by applying the phase detection method of Embodiments 6 to 8 described above, when the transformer 300 is turned on with the circuit breaker 200 A large excitation inrush current can be suppressed.
- the steady magnetic flux of the transformer that is, the magnetic flux when a voltage is applied to the transformer in a steady state, is also obtained by integrating the voltage measured by the power supply voltage measuring device installed on the bus or the like. be able to.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Transformers (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Keying Circuit Devices (AREA)
- Transformers For Measuring Instruments (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US12/516,717 US8310106B2 (en) | 2006-11-29 | 2007-11-29 | Magnetizing inrush current suppression device and method for transformer |
CA 2670907 CA2670907C (en) | 2006-11-29 | 2007-11-29 | Magnetizing inrush current suppression device and method for transformer |
EP18167323.7A EP3367409A1 (en) | 2006-11-29 | 2007-11-29 | Apparatus and method for compressing exciting inrush current of transformer |
EP07828105.2A EP2091058A4 (en) | 2006-11-29 | 2007-11-29 | Apparatus and method for compressing exciting inrush current of transformer |
CN200780047474XA CN101563744B (zh) | 2006-11-29 | 2007-11-29 | 变压器的励磁涌流抑制装置和方法 |
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JP2006321624 | 2006-11-29 | ||
JP2006-321624 | 2006-11-29 | ||
JP2007-309398 | 2007-11-29 | ||
JP2007309398A JP4896858B2 (ja) | 2006-11-29 | 2007-11-29 | 変圧器の励磁突入電流抑制装置および方法 |
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WO2008065757A1 true WO2008065757A1 (fr) | 2008-06-05 |
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PCT/JP2007/001328 WO2008065757A1 (fr) | 2006-11-29 | 2007-11-29 | Appareil et procédé permettant de compresser un courant d'appel d'excitation d'un transformateur |
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US (1) | US8310106B2 (ja) |
EP (2) | EP3367409A1 (ja) |
JP (1) | JP4896858B2 (ja) |
CN (1) | CN101563744B (ja) |
CA (1) | CA2670907C (ja) |
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JP2010004686A (ja) * | 2008-06-20 | 2010-01-07 | Toshiba Corp | 変圧器の励磁突入電流抑制装置及びその制御方法 |
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WO2010103741A1 (ja) * | 2009-03-13 | 2010-09-16 | 株式会社 東芝 | 過電圧抑制装置 |
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JP2012043712A (ja) * | 2010-08-20 | 2012-03-01 | Toshiba Corp | 励磁突入電流抑制装置 |
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US9385525B2 (en) | 2011-09-14 | 2016-07-05 | Kabushiki Kaisha Toshiba | Magnetizing inrush current suppression device |
Also Published As
Publication number | Publication date |
---|---|
CA2670907A1 (en) | 2008-06-05 |
EP2091058A1 (en) | 2009-08-19 |
CN101563744A (zh) | 2009-10-21 |
EP3367409A1 (en) | 2018-08-29 |
CN101563744B (zh) | 2011-11-30 |
EP2091058A4 (en) | 2017-07-26 |
JP2008160100A (ja) | 2008-07-10 |
US20100141235A1 (en) | 2010-06-10 |
CA2670907C (en) | 2012-10-30 |
US8310106B2 (en) | 2012-11-13 |
JP4896858B2 (ja) | 2012-03-14 |
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