WO2010035778A1 - 変圧器励磁突入電流抑制装置 - Google Patents
変圧器励磁突入電流抑制装置 Download PDFInfo
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- WO2010035778A1 WO2010035778A1 PCT/JP2009/066631 JP2009066631W WO2010035778A1 WO 2010035778 A1 WO2010035778 A1 WO 2010035778A1 JP 2009066631 W JP2009066631 W JP 2009066631W WO 2010035778 A1 WO2010035778 A1 WO 2010035778A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H33/593—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for ensuring operation of the switch at a predetermined point of the ac cycle
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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
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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
Definitions
- the present invention relates to a transformer excitation inrush current suppressing device that suppresses an excitation inrush current generated at the time of turning on a three-phase circuit breaker that substantially simultaneously turns on and off a three-phase power supply to a three-phase power source.
- One method for suppressing the magnetizing inrush current of the transformer is a phase control charging method in which a circuit breaker is switched on at a specific phase of a three-phase power source.
- the present invention relates to a transformer excitation inrush current suppression device using a phase control charging method.
- the transformer excitation inrush current suppression device described in Patent Document 1 is a three-phase transformer so as to be suitable for an input signal of an optimum input phase calculation device as an electronic device.
- Step-down means for stepping down the phase voltage of the transformer reduces the phase voltage of each phase that changes transiently and finally becomes zero when the three-phase transformer is shut off,
- the residual magnetic flux in the iron core of the three-phase transformer is calculated by integrating the voltage with the residual magnetic flux calculation means as an input signal, and derived from the relational expression between the magnetic flux at the time of application, the input phase and the residual magnetic flux by the input phase calculation means.
- the optimum closing phase which is different for each of the three phases where no magnetizing rush current is generated is calculated, and this calculation result is used as the output signal of the optimum closing phase calculating device, and this output signal is output to the phase control device of the circuit breaker. And each phase is separately introduced in the circuit breaker as a phase signal.
- any one of the three phases is a closed first phase, and for the remaining two phases, the reference phase is 0 degrees as a reference point.
- the residual magnetic flux of the remaining two phases is set to 0, and is lower than the voltage value of the interpolar voltage of the closed first phase, which is the difference between the power supply side voltage and the transformer side voltage of the closed first phase,
- the remaining two-phase inter-electrode voltage which is the difference between the remaining two-phase power supply side voltage and the transformer side voltage, corresponds to the pre-arc characteristic and the closing time variation characteristic of the three-phase circuit breaker that are obtained in advance.
- the closing phase that minimizes the applied magnetic flux error is calculated and set as the remaining two-phase target closing phase, and the time from the reference point to the remaining two-phase target closing phase and the closing phase are set. Based on the time when the DC component of the remaining two-phase residual magnetic flux becomes zero after the first pole phase is charged.
- the total closing time corresponding to an integral multiple of the cycle of the three-phase power source set in advance is set as the remaining two-phase target closing time, and a closing command is input, The remaining two phases are closed at the target closing time.
- the transformer excitation rush suppression device described in Patent Document 1 when determining the closing phase of the circuit breaker, the variation in the mechanical closing time of the circuit breaker and the influence of the pre-arc are not considered, Due to these factors, there is a problem that the charging is actually performed at a point deviated from the optimal charging phase, and an excessive excitation inrush current is generated at that time. Moreover, the transformer excitation inrush current suppression device described in Patent Document 2 sets an optimal target closing time for each phase when the transformer is turned on to a three-phase power source. Therefore, the transformer cannot be applied to a circuit breaker in which a three-phase power supply is simultaneously supplied to a three-phase power source.
- the present invention solves the above-described conventional problems, and in a three-phase circuit breaker that simultaneously turns on and off a three-phase transformer to a three-phase power source, the exciting inrush current generated in the three-phase transformer at the time of turning on
- An object of the present invention is to provide a transformer excitation inrush current suppressing device capable of suppressing the above.
- a transformer excitation inrush current suppression device is a transient current generated in a three-phase transformer when the three-phase transformer is turned on in a three-phase circuit breaker that substantially simultaneously turns on a three-phase power source.
- a transformer excitation inrush current suppressing device for suppressing excitation inrush current as The residual magnetic flux values of the first to third phases of the three-phase power source, the pre-arc characteristics and the closing time variation characteristics of the three-phase circuit breaker, and the winding on the side where the three-phase circuit breaker of the three-phase transformer is connected
- the applied magnetic flux error which is the maximum absolute value of the center value of the transformer magnetic flux generated in the steady state after application, is applied to each phase.
- target closing phase of the first phase is determined so as to be determined for each closing phase of the first phase and the evaluation value related to the applied magnetic flux error of the determined first to third phases is substantially minimized.
- Target closing phase determining means for Three-phase circuit breaker control means for controlling the three-phase circuit breaker to close at the timing of the determined target closing phase of the first phase is provided.
- the transformer excitation inrush current suppression device According to the transformer excitation inrush current suppression device according to the present invention, the residual magnetic flux values of the first to third phases of the three-phase power source, the pre-arc characteristic and the closing time variation characteristic of the three-phase circuit breaker, the three-phase transformer
- the applied magnetic flux error which is the maximum absolute value, is determined for each closed phase of the first phase with respect to each phase, and the evaluation value relating to the determined first to third applied magnetic flux errors is substantially minimized.
- the target closing phase determining means for determining the target closing phase of the first phase is provided, the magnetizing inrush current can be suppressed in all three phases.
- FIG. 3 is a circuit diagram showing a connection condition I in which three windings L1, L2 and L3 on the side to which the three-phase circuit breaker 3 is connected are star-connected and the neutral point of the star connection is not grounded.
- FIG. 6 is a circuit diagram showing a connection condition II in which windings L1, L2 and L3 are delta-connected.
- FIG. 5 is a circuit diagram showing a connection condition III in which windings L1, L2 and L3 are star-connected and a neutral point of the star connection is grounded.
- (A) is a graph which shows the pre-arc characteristic and closing time dispersion
- (b) is after putting a contactor in voltage phase (theta) 1, (theta) 2, (theta) 3 of (a). It is a graph which shows each transformer magnetic flux and center value (phi) c1, (phi) c2, (phi) c3 of the said transformer magnetic flux.
- 3 is a graph showing an example of each of applied magnetic flux errors ⁇ a, ⁇ b, and ⁇ c of A phase, B phase, and C phase with respect to each closing phase ⁇ ca calculated by the target closing phase determination circuit 8 of FIG.
- (A) is a graph showing power supply voltages ypa, ypb, ypc of A phase, B phase, and C phase, respectively, and (b) is closed at the target closing phase ⁇ ta of FIG. 6 and input at the voltage phase ⁇ close.
- 7 is a graph showing transformer voltages yta, ytb, and ytc of A phase, B phase, and C phase, respectively, and (c) shows the A phase when the target is closed at the target closing phase ⁇ ta of FIG. FIG.
- FIG. 7 is a graph showing absolute values
- FIG. 1 is a block diagram showing a configuration of a transformer excitation inrush current suppression device 40 according to Embodiment 1 of the present invention.
- a transformer excitation inrush current suppression device 40 includes a residual magnetic flux measurement circuit 6, a three-phase circuit breaker characteristic memory 7, a target closing phase determination circuit 8, and a three-phase circuit breaker controller 9. Is done.
- a three-phase power source 2 generates A-phase, B-phase, and C-phase power supply voltages ypa, ypb, and ypc, and outputs them to the contacts 3a, 3b, and 3c of the three-phase circuit breaker, respectively. Furthermore, the respective contacts 3a, 3b and 3c of the three-phase circuit breaker 3 are connected to the windings L1, L2 and L3 on the three-phase circuit breaker 3 side of the three-phase transformer 1.
- FIG. 2 shows that the three windings L1, L2 and L3 on the side to which the three-phase circuit breaker 3 is connected are star-connected (also referred to as star connection or Y-connection) and the neutral point of the star connection is grounded.
- FIG. 3 is a circuit diagram illustrating a connection condition II in which the windings L1, L2, and L3 are delta-connected (also referred to as a triangular connection), and FIG. FIG.
- connection condition III is a circuit diagram showing a connection condition III in which windings L1, L2, and L3 are star-connected and a neutral point of the star connection is grounded.
- Each winding (not shown) of the three-phase transformer 1 on the side where the three-phase circuit breaker 3 is not connected is connected according to any one of the connection conditions I to III.
- the three-phase transformer 1 is in a no-load state that is not connected to a load.
- the voltage measuring device 5 measures the ground voltage of the A phase that is the reference phase, generates a measurement signal Sva indicating the measurement result, and outputs the measurement signal Sva to the three-phase circuit breaker controller 9.
- the voltage measuring device 4 includes voltage measuring devices 4a, 4b and 4c.
- the voltage measuring devices 4a, 4b and 4c measure the ground voltages of the A-phase, B-phase and C-phase three-phase transformer 1, respectively, generate measurement signals S4a, S4b and S4c indicating the measurement results, and remain Output to the magnetic flux measurement circuit 6.
- each of the voltage measuring devices 5, 4a, 4b, 4c is constituted by an AC voltage measuring sensor generally used in a high voltage circuit.
- FIG. 5 is a graph which shows the pre-arc characteristic and closing time dispersion
- Each contact 3a, 3b, 3c of the three-phase circuit breaker 3 has the same pre-arc characteristic and closing time variation characteristic, and hereinafter, when the contacts 3a, 3b, 3c are not distinguished from each other, simply the contact Or it is called three-phase circuit breaker 3.
- Each of the contacts 3a, 3b, 3c of the three-phase circuit breaker 3 has responded to the input closing command signal Sc and a predetermined mechanical operation time has elapsed since the closing command signal Sc was output. Later, mechanical contact.
- the timing when the contact is mechanically contacted is called closing, and the mechanical operation time is called closing time.
- the closing time depends on the ambient temperature of the three-phase circuit breaker 3, the operating oil pressure, the control voltage, and the downtime. It is also known that the main circuit current starts to flow through the contact due to the preceding discharge before closing. This preceding discharge is called a pre-arc, and the timing at which the main circuit current begins to flow is referred to as turning on.
- the charging timing depends on the absolute value of the interelectrode voltage, which is the voltage applied between the electrodes of the contact of the three-phase circuit breaker 3.
- the pre-arc characteristic of the contact is referred to as pre-arc characteristic.
- the contacts 3a, 3b, 3c have the same pre-arc characteristic.
- each contactor has a mechanical operation variation, and when a closing command signal is input at a predetermined timing, the probability distribution of the timing at which the contactor actually closes is at the predetermined timing. It becomes a normal distribution that fluctuates around the corresponding closing time.
- the characteristic of variation in the closing time of the contact is referred to as the closing time variation characteristic.
- the contacts 3a, 3b, 3c have the same closing time variation characteristics.
- the withstand voltage straight line Lw indicates the voltage phase of the interelectrode voltage of the contact when the contact is closed at the closing point P0 having the voltage phase ⁇ 0 (hereinafter, the voltage phase of the contact).
- the relationship of the withstand voltage value between the contacts of the contact is shown.
- the contact when the absolute value of the inter-electrode voltage is lower than the withstand voltage value, the contact is not applied, and at the input point P1, which is the intersection of the withstand voltage straight line Lw and the absolute value of the inter-electrode voltage, between the contacts. Since the withstand voltage value becomes equal to the absolute value of the interelectrode voltage, a pre-arc is generated and the contact is inserted.
- the voltage phase ⁇ 1 at the closing point P1 is different from the voltage phase ⁇ 0 at the time of closing. Therefore, when determining the optimum target closing phase to suppress the magnetizing inrush current, the pre-arc characteristic is set. It is necessary to consider.
- FIG. 5A shows the fluctuation range of the withstand voltage straight line Lw by broken lines Lw1 and Lw2 when the closing time variation is ⁇ 1 millisecond (corresponding to the voltage phase variation ⁇ v). Furthermore, since there is a discharge variation between the electrodes in the contact of the three-phase circuit breaker 3, the slope of the withstand voltage line Lw varies.
- 5A shows the fluctuation range of the withstand voltage line Lw as solid lines Lw3 and Lw4 when the variation in the closing time is ⁇ 1 ms and the inclination of the withstand voltage line Lw varies by ⁇ 10%.
- the minimum withstand voltage is controlled even if control is performed to close at the target closing point P0.
- a transformer magnetic flux having a sine wave shape is generated.
- the contact of the three-phase circuit breaker 3 may be inserted at a voltage phase at which the absolute value of the absolute value of the minimum value and the minimum value is the smallest.
- FIG. 5 is a graph showing each transformer magnetic flux and the center values ⁇ c1, ⁇ c2, and ⁇ c3 of the transformer magnetic flux after the contacts are inserted at the voltage phases ⁇ 1, ⁇ 2, and ⁇ 3 in FIG. 5 (a). It is.
- the maximum absolute value of the center value of the transformer magnetic flux after being applied at each voltage phase between the voltage phases ⁇ 2 and ⁇ 3 is defined as an applied magnetic flux error ⁇ .
- the applied magnetic flux error ⁇ is the absolute value of the center value ⁇ c3 of the transformer magnetic flux when applied at the voltage phase ⁇ 3.
- the residual magnetic flux measurement circuit 6 includes three integration circuits that integrate the measurement signals S4a, S4b, and S4c from the voltage measurement device 4 and the three-phase circuit breaker controller 9, respectively.
- the opening control signal So based on the measurement signals S4a, S4b, S4c and the signals of the integration results, the residual magnetic flux value for each phase after the three-phase circuit breaker 3 is interrupted (opening).
- an arithmetic circuit that calculates ⁇ ra, ⁇ rb, and ⁇ rc, and generates and outputs signals S6a, S6b, and S6c indicating the residual magnetic flux values ⁇ ra, ⁇ rb, and ⁇ rc.
- the arithmetic circuit After receiving the opening command signal, the arithmetic circuit detects the timing at which the A-phase voltage value has converged to zero based on the measurement signal S4a, and based on the signal of the integration result of the measurement signal S4a at the timing.
- the residual magnetic flux value ⁇ ra of the phase is calculated. Further, similarly to the A-phase residual magnetic flux value ⁇ ra, the B-phase residual magnetic flux value ⁇ rb and the C-phase residual magnetic flux value ⁇ rc are calculated.
- the three-phase circuit breaker characteristic memory 7 stores data relating to pre-arc characteristics of the three-phase circuit breaker 3 that have been measured in advance, data relating to variation characteristics in the closing time, and windings L1 and L2 on the three-phase circuit breaker 3 side of the three-phase transformer 1.
- L3 connection condition data is stored.
- the data relating to the pre-arc characteristic includes the slope value of the withstand voltage line Lw and the slope variation value (%) when the slope of the tangent line of the power supply voltage is 1 when the voltage phase of the power supply voltage is 0 degree.
- the closing time variation characteristic data is the closing time variation value (milliseconds).
- the data relating to the connection conditions of the windings L1, L2, L3 on the three-phase circuit breaker 3 side of the three-phase transformer 1 is a predetermined flag value indicating the connection conditions I to III.
- the target closing phase determination circuit 8 has a predetermined timing from the three-phase circuit breaker characteristic memory 7 to the pre-arc characteristic of the three-phase circuit breaker 3, the closing time variation characteristic, and the winding on the three-phase circuit breaker 3 side of the three-phase transformer 1.
- Each data related to the data relating to the wire connection conditions is read out, and the signals S6a, S6b, S6c indicating the residual magnetic flux values ⁇ ra, ⁇ rb, ⁇ rc from the residual magnetic flux measuring circuit 6 and the read pre-arc characteristics of the three-phase circuit breaker 3 Data on the characteristics of variation in the closing time, the connection condition of the winding on the side where the three-phase circuit breaker 3 of the three-phase transformer 1 is connected, and the voltage phase difference (120 degrees) between each phase of the three-phase power source 2 )), Magnetic flux errors ⁇ a, ⁇ b, ⁇ c for each phase are calculated for each closing phase of the reference phase, as will be described later.
- the target closing phase determination circuit 8 sets the target closing phase ⁇ ta of the reference phase (hereinafter referred to as A phase) so as to minimize the maximum value of the applied magnetic flux errors ⁇ a, ⁇ b, ⁇ c of each phase.
- a signal indicating the determined target closing phase ⁇ ta is generated and output to the three-phase circuit breaker controller 9.
- the three-phase circuit breaker controller 9 generates an opening control signal So in response to the opening command Co input from the host controller and outputs it to the three-phase circuit breaker 3 and the residual magnetic flux measuring circuit 6.
- the three-phase circuit breaker controller 9 responds to the closing command Cc input from the host controller, and the voltage phase of the contact 3a is changed based on the target closing phase from the target closing phase determination circuit 8.
- the elapsed time from the timing of 0 degree to the timing corresponding to the target closing phase (hereinafter referred to as the target closing time) is calculated, and the measurement signal Sva indicating the A-phase ground voltage from the voltage measuring device 5 is calculated. Based on, the timing when the voltage phase of the A phase is 0 degree is detected. Then, when the three-phase transformer 1 is not connected to the load, the three-phase circuit breaker 3 is closed at the timing when the target closing time has elapsed from the detected timing. A control signal is generated and output to the three-phase circuit breaker 3.
- the target closing phase determination circuit 8 calculates the applied magnetic flux errors ⁇ a, ⁇ b, ⁇ c of each phase by standardizing the magnetic flux amplitude of the three-phase transformer 1 when the rated voltage is applied to the rated value. Per Unit).
- the target closing phase determining circuit 8 sets a closing voltage phase (hereinafter referred to as a closing phase) ⁇ ca with reference to the power supply voltage of the reference phase (A phase) within a range of 0 degrees to 360 degrees (a predetermined interval (for example, the applied magnetic flux errors ⁇ a, ⁇ b, and ⁇ c are calculated as follows for each closing voltage phase.
- the A phase closing voltage phase ⁇ and the B phase closing The pole voltage phase ⁇ and the C-phase closing voltage phase ⁇ are respectively changed at predetermined intervals within the following formulas (1) to (3), and the slope r of the withstand voltage line is set to Using the center value ra of the inclination, the value is changed at a predetermined interval within the range of the following formula (2).
- ⁇ v is the magnitude of the voltage phase variation corresponding to the magnitude of the closing time variation (for example, 1 millisecond).
- the target closing phase determining circuit 8 changes the closing voltage phase ⁇ , ⁇ , ⁇ of each phase and the slope r of the withstand voltage straight line within the range of the equations (1) to (4), and the withstand voltage of each phase.
- ⁇ cb and ⁇ cc are obtained, respectively, and the applied magnetic flux errors ⁇ a, ⁇ b, and ⁇ c, which are the maximum values of the absolute values ⁇ ca, ⁇ cb, and ⁇ cc of the center values of the transformer magnetic flux, are obtained.
- the absolute values ⁇ ca, ⁇ cb, ⁇ cc of the center value of the magnetic flux of the transformer depend on the connection conditions I to III of the winding on the three-phase circuit breaker 3 side of the three-phase transformer 1 and the number of input phases. To do.
- the power supply voltages ypa, ypb, ypc for the A phase, the B phase, and the C phase are respectively defined as follows using the A phase voltage phase ⁇ .
- ypc sin ( ⁇ -240 °)
- connection condition I When the connection condition I is such that the three windings L1, L2, L3 on the side to which the three-phase circuit breaker 3 is connected are star-connected and the neutral point of the star connection is not grounded:
- each withstand voltage line ywa, ywb, ywc of the A phase, the B phase, and the C phase is expressed by the following equations.
- ywa r ⁇ ( ⁇ )
- ywb r ⁇ ( ⁇ )
- ywc r ⁇ ( ⁇ )
- the phase of the A phase is determined as the input voltage phase ⁇ a.
- the same phase may be determined as the input voltage phases of the plurality of phases.
- the inter-electrode voltages yia, yib, yic of the A phase, the B phase, and the C phase are expressed by the following equations, respectively.
- the phase of the B phase is determined as the input voltage phase ⁇ b.
- the same phase may be determined as the input voltage phases of the plurality of phases.
- the inter-electrode voltages yia, yib, yic of the A phase, the B phase, and the C phase are expressed by the following equations, respectively.
- the input voltage phase ⁇ c of the C phase is determined by solving the following equation with respect to the voltage phase ⁇ .
- ywc
- the absolute values ⁇ ca, ⁇ cb, ⁇ cc of the center values of the respective transformer magnetic fluxes after the three-phase input are obtained using the input voltage phase ⁇ 2 of the input second phase as follows.
- the input voltage phases ⁇ a, ⁇ b, and ⁇ c of the A phase, the B phase, and the C phase are calculated in the same manner as in the connection condition I described above. Further, the absolute values ⁇ ca, ⁇ cb, ⁇ cc of the center values of the respective transformer magnetic fluxes after the three-phase input are as follows using the input voltage phase ⁇ 2 of the input second phase and the input voltage phase ⁇ 3 of the input third phase, respectively. Is required.
- connection condition III in which the three windings L1, L2, L3 on the side to which the three-phase circuit breaker 3 is connected are star-connected and the neutral point of the star connection is grounded:
- the applied voltage phase is calculated in the same manner as when the first phase is applied in the connection conditions I and II described above.
- the inter-electrode voltages yia, yib, yic of the A phase, the B phase, and the C phase are expressed by the following equations, respectively.
- the phase of the B phase is determined as the input voltage phase ⁇ b.
- the magnetic flux generated in the remaining one-phase transformer when the two phases are turned on is similar to the transformer magnetic flux after the three-phase is turned on, and therefore the remaining one-phase applied voltage phase ⁇ c is also B This is the same as the phase input voltage phase ⁇ b.
- the absolute values ⁇ ca, ⁇ cb, ⁇ cc of the center values of the respective transformer magnetic fluxes after the three-phase input are obtained using the input voltage phase ⁇ 2 of the input second phase as follows.
- FIG. 6 is a graph showing an example of the applied magnetic flux errors ⁇ a, ⁇ b, and ⁇ c of the A phase, the B phase, and the C phase with respect to each closing phase ⁇ ca calculated by the target closing phase determination circuit 8 of FIG. .
- the following values were assumed.
- the target closing phase determination circuit 8 has an A phase closing voltage that minimizes the maximum value of the three-phase applied magnetic flux errors ⁇ a, ⁇ b, ⁇ c from the voltage phases 0 to 360 degrees in FIG.
- the phase ⁇ ca is determined. In the example shown in FIG. 6, when the A-phase closing phase ⁇ ca is 96 degrees, the maximum values of the three-phase applied magnetic flux errors ⁇ a, ⁇ b, and ⁇ c are minimum, so the target closing phase ⁇ ta is 96. Determined every degree.
- FIG. 7A is a graph showing power supply voltages ypa, ypb, ypc for the A phase, B phase, and C phase, respectively
- FIG. 7B is a voltage that is closed at the target closing phase ⁇ ta of FIG.
- FIG. 7 is a graph showing transformer voltages yta, ytb, and ytc of A phase, B phase, and C phase when the phase ⁇ close is applied
- FIG. 6C is a diagram when the target is closed at the target closing phase ⁇ ta of FIG. 6.
- FIG. 7 is a graph showing absolute values
- the target closing phase determination circuit 8 determines the residual magnetic flux values ⁇ ra, ⁇ rb, and ⁇ rc of each phase, the pre-arc characteristics of the three-phase circuit breaker 3, and variations in the closing time.
- the applied magnetic flux error ⁇ a of each phase , ⁇ b, ⁇ c are calculated for each closing phase of the A phase that is the reference phase, and the target closing of the A phase that is the reference phase is minimized so that the maximum value of the applied magnetic flux errors ⁇ a, ⁇ b, ⁇ c of each phase is minimized. Since the pole phase ⁇ ta is determined, it is possible to stably suppress the magnetizing inrush current as a transient current generated in the three-phase transformer 1 when the three-phase circuit breaker is turned on as compared with the prior art.
- the residual magnetic flux measurement circuit 6 measures the residual magnetic flux values ⁇ ra, ⁇ rb, and ⁇ rc of each phase.
- the present invention is not limited to this, and the residual magnetic flux measurement circuit 6 may not be provided.
- the target closing phase determination circuit 8 replaces the residual magnetic flux values ⁇ ra, ⁇ rb, and ⁇ rc with the upper and lower limits of the residual magnetic flux value ⁇ ra of each phase measured or estimated in advance and the residual magnetic flux value ⁇ rb.
- the upper limit value and the lower limit value, the lower limit value and the upper limit value of the residual magnetic flux value ⁇ rc, the pre-arc characteristic and the closing time variation characteristic of the three-phase circuit breaker 3, and the three-phase circuit breaker 3 of the three-phase transformer 1 are connected.
- the applied magnetic flux errors ⁇ a, ⁇ b, ⁇ c for each phase are calculated.
- the voltage phases ⁇ , ⁇ , ⁇ are respectively changed at predetermined intervals within the range of the above formulas (1) to (3), and the slope r of the withstand voltage straight line is obtained when the closing phase is ⁇ ca.
- the magnetic flux is changed at predetermined intervals within the range of the above formula (4), and the residual magnetic flux values of the A phase, the B phase, and the C phase are between the lower limit value and the upper limit value.
- the maximum absolute value of the center value of the transformer magnetic flux generated in the steady state after turning on the three-phase circuit breaker is changed within the range, and the applied magnetic flux errors ⁇ a, ⁇ b of each phase at the closing phase ⁇ ca, ⁇ c may be used.
- Embodiment 2 FIG. In the first embodiment, it is assumed that the contacts 3a, 3b, 3c are closed substantially simultaneously in response to the closing control signal Sc. However, in practice, even if all the contacts 3a, 3b, 3c are controlled to close at substantially the same time, the B-phase and C-phase closing times are respectively equal to the A-phase closing times. On the other hand, the amount of deviation of a predetermined closing time average value is shifted.
- the second embodiment is compared with the first embodiment.
- the three-phase circuit breaker characteristic memory 7 further stores in advance a deviation amount of each average closing time of the B phase and the C phase with respect to the closing time of the A phase that is the reference phase
- the target closing phase determination circuit 8 further performs the target closing of the three-phase circuit breaker 3 based on the deviation amount of the average values of the closing times of the other two phases with respect to the closing time of the A phase as the reference phase. It is characterized by determining the polar phase.
- the target closing phase determination circuit 8 reads from the three-phase circuit breaker characteristic memory 7 the deviation amount of the average closing times of the B phase and the C phase with respect to the closing time of the A phase that is the reference phase.
- the shift amount of the time average value is converted into a voltage phase difference. For example, when the deviation amounts of the average closing times of the B phase and the C phase with respect to the closing time of the reference phase are +1 ms and +2 ms, and the system frequency is 60 Hz, 120 B of the closing phase of the B phase.
- the deviation ⁇ db from the angle is +21.6 degrees, and the deviation ⁇ dc from the C-phase closing phase of 240 degrees is +43.2 degrees.
- the present embodiment it is possible to further suppress the magnetizing inrush current generated in the three-phase transformer 1 when the three-phase circuit breaker is turned on as compared with the first embodiment.
- FIG. 8 is a block diagram showing a configuration of a transformer excitation inrush current suppression device 40A according to Embodiment 3 of the present invention.
- the transformer excitation inrush current suppression device 40A according to the present embodiment is different from the transformer excitation inrush current suppression device 40 according to Embodiment 1 (see FIG. 1) in the residual magnetic flux of each phase.
- a map memory 10 for storing a map indicating a relationship between the values ⁇ ra, ⁇ rb, ⁇ rc and the target closing phase of the reference phase is further provided, and a target closing phase determination circuit 8A is provided instead of the target closing phase determination circuit 8. It is characterized by having prepared.
- the target closing phase determination circuit 8A includes a residual magnetic flux value A phase, a B phase, and a C phase for each combination of the residual magnetic flux values ⁇ ra, ⁇ rb, and ⁇ rc of the A phase, the B phase, and the C phase.
- the pre-arc characteristic and the closing time variation characteristic of the three-phase circuit breaker 3, the connection condition of the winding on the side where the three-phase circuit breaker 3 of the three-phase transformer 1 is connected, and each phase of the three-phase power source 2 Based on the voltage phase difference and the deviation amount of the average closing times of the B and C phases with respect to the closing time of the A phase, the applied magnetic flux errors ⁇ a, ⁇ b, and ⁇ c of each phase are determined for each closing phase with respect to the reference phase.
- the target closing phase with respect to the reference phase is determined so as to substantially minimize the evaluation value regarding the input magnetic flux errors ⁇ a, ⁇ b, ⁇ c of each phase, and the residual magnetic flux values ⁇ ra, ⁇ rb, Based on the target closing phase of the reference phase determined for each combination of ⁇ rc, Form to be stored in the map memory 10 in advance.
- the evaluation value is the maximum value of the applied magnetic flux errors ⁇ a, ⁇ b, ⁇ c.
- the target closing phase determination circuit 8A determines the reference closing phase of the reference phase based on the residual magnetic flux values ⁇ ra, ⁇ rb, and ⁇ rc of each phase with reference to the map.
- the evaluation value may be the sum of applied magnetic flux errors ⁇ a, ⁇ b, ⁇ c.
- the target closing phase determination circuits 8 and 8A determine the target closing phase of the reference phase so as to minimize the sum of the applied magnetic flux errors ⁇ a, ⁇ b, and ⁇ c of each phase. May be. Thereby, the inrush current generated in the three-phase transformer 1 when the three-phase circuit breaker is turned on can be suppressed as in the above embodiments.
- the voltage measuring devices 5, 4a, 4b, 4c measure the voltage of the three-phase power source 2 on the primary winding side of the three-phase transformer 1, respectively.
- the voltage on the secondary winding side or the tertiary winding side of the three-phase transformer 1 may be measured.
- the voltage measuring devices 5, 4a, 4b, and 4c measure the ground voltage of each phase from the three-phase power source 2, the present invention is not limited to this, and the interphase voltage may be measured.
- the three-phase circuit breaker controller 9 may be configured similarly to the closing control means described in Patent Document 2 or the control signal output means described in Patent Document 3.
- the opening phase of the three-phase circuit breaker 3 may be controlled so that the residual magnetic fluxes ⁇ ra, ⁇ rb, and ⁇ rc have predetermined values. At this time, the voltage measuring device 4 and the residual magnetic flux measuring circuit 6 are not provided, and the predetermined value may be output to the target closing phase determining circuits 8 and 8A.
- the applied magnetic flux error that is the maximum absolute value of the center value of the transformer magnetic flux is determined for each closed phase of the first phase for each phase, and the determined applied magnetic flux errors of the first to third phases are determined. Since the target closing phase determining means for determining the target closing phase of the first phase is provided so as to substantially minimize the evaluation value, the magnetizing inrush current can be suppressed in all three phases.
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Abstract
Description
三相電源の第1乃至第3相の各残留磁束値と、三相遮断器のプレアーク特性及び閉極時間ばらつき特性と、三相変圧器の三相遮断器が接続されている側の巻線の結線条件と、三相電源の各相間の電圧位相差とに基づいて、投入後の定常状態において発生する変圧器磁束の中心値の絶対値の最大値である投入磁束誤差を、各相に対して第1相の閉極位相毎に決定し、決定された第1乃至第3相の投入磁束誤差に関する評価値を実質的に最小にするように、第1相の目標閉極位相を決定する目標閉極位相決定手段と、
三相遮断器を決定された第1相の目標閉極位相のタイミングで閉極するように制御する三相遮断器制御手段とを備えたことを特徴とする。
図1は、本発明の実施の形態1に係る変圧器励磁突入電流抑制装置40の構成を示すブロック図である。図1において、変圧器励磁突入電流抑制装置40は、残留磁束測定回路6と、三相遮断器特性メモリ7と、目標閉極位相決定回路8と、三相遮断器コントローラ9とを備えて構成される。
(θca-Δθv)≦β≦(θca+Δθv) (2)
(θca-Δθv)≦γ≦(θca+Δθv) (3)
ra×0.9≦r≦ra×1.1 (4)
ypa=sinθ
ypb=sin(θ-120°)
ypc=sin(θ-240°)
A相,B相,C相の各変圧器電圧yta,ytb,ytcは、以下のようにゼロである。
yta=0
ytb=0
ytc=0
yia=ypa-yta=ypa
yib=ypb-ytb=ypb
yic=ypc-ytc=ypc
ywa=r×(θ-α)
ywb=r×(θ-β)
ywc=r×(θ-γ)
|yia|=ywa
|yib|=ywb
|yic|=ywc
(2)2相目投入時:
1相目投入後のA相,B相,C相の各変圧器電圧yta,ytb,ytcは、投入第1相の電源電圧に一致する。従って、例えば、A相が投入第1相であるときには、A相,B相,C相の各変圧器電圧yta,ytb,ytcはそれぞれ、以下の式で表される。
yta=ypa
ytb=ypa
ytc=ypa
yia=ypa-yta=0
yib=ypb-ytb=ypb-ypa
yic=ypc-ytc=ypc-ypa
|yib|=ywb
|yic|=ywc
2相目投入後のA相,B相,C相の各変圧器電圧yta,ytb,ytcは、投入済の相については電源電圧に一致し、未投入相については、投入済二相の電源電圧の平均値に一致する。従って、例えば、未投入相がC相であるときには、A相,B相,C相の各変圧器電圧yta,ytb,ytcはそれぞれ、以下の式で表される。
yta=ypa
ytb=ypb
ytc=(ypa+ypb)/2
yia=ypa-yta=0
yib=ypb-ytb=0
yic=ypc-ytc=ypc-(ypa+ypb)/2
|yic|=ywc
上述した結線条件I,IIにおける1相目投入時と同様に投入電圧位相が算出される。
1相目投入後は、投入第1相に対応する変圧器電圧は当該投入第1相の電源電圧に一致し、残り二相の変圧器電圧は、投入第1相の電源電圧の逆相の1/2となる。従って、例えば、A相が投入第1相であるときには、A相,B相,C相の各変圧器電圧yta,ytb,ytcはそれぞれ、以下の式で表される。
yta=ypa
ytb=-ypa/2
ytc=-ypa/2
yia=ypa-yta=0
yib=ypb-ytb=ypb+ypa/2
yic=ypc-ytc=ypc+ypa/2
|yib|=ywb
|yic|=ywc
(1)結線条件が上記結線条件Iである(スター結線であって中性点非接地);
(2)閉極時間ばらつきの値=±1ミリ秒;
(3)電源電圧が0度のときの接線の傾きを1としたときの耐電圧直線の傾き=0.8;
(4)上記耐電圧直線の傾きのばらつき=±10%;
(5)A相の残留磁束値φra=-0.5PU;
(6)B相の残留磁束値φrb=0PU;
(7)C相の残留磁束値φrc=+0.5PU.
実施の形態1において、接触子3a,3b,3cは閉極制御信号Scに応答して実質的に同時に閉極されると仮定した。しかしながら、実際には、全ての接触子3a,3b,3cを実質的に同時に閉極するように制御しても、B相及びC相の各閉極時間はそれぞれ、A相の閉極時間に対して所定の閉極時間平均値のずれ量だけずれる。
(1)三相遮断器特性メモリ7は、基準相であるA相の閉極時間に対するB相及びC相の各閉極時間平均値のずれ量を予めさらに格納し、
(2)目標閉極位相決定回路8はさらに、基準相であるA相の閉極時間に対する他の二相の各閉極時間平均値のずれ量に基づいて、三相遮断器3の目標閉極位相を決定することを特徴としている。
これに対応して、前述の式(1)~(3)を以下の式(5)~(7)に置き換え、前述同様の演算を実行して、目標閉極位相θtaを決定する。
(θca-Δθv)≦α≦(θca+Δθv) (5)
(θca+Δdb-Δθv)≦β≦(θca+Δdb+Δθv) (6)
(θca+Δdc-Δθv)≦γ≦(θca+Δdc+Δθv) (7)
図8は、本発明の実施の形態3に係る変圧器励磁突入電流抑制装置40Aの構成を示すブロック図である。図8において、本実施の形態に係る変圧器励磁突入電流抑制装置40Aは、実施の形態1に係る変圧器励磁突入電流抑制装置40(図1参照。)に比較して、各相の残留磁束値φra,φrb,φrcと基準相の目標閉極位相との間の関係を示すマップを格納するマップメモリ10をさらに備え、目標閉極位相決定回路8に代えて目標閉極位相決定回路8Aを備えたことを特徴としている。
上記各実施の形態において、目標閉極位相決定回路8、8Aは、各相の投入磁束誤差Δφa,Δφb,Δφcの和の値を最小にするように、基準相の目標閉極位相を決定してもよい。これにより、上記各実施の形態と同様に、三相遮断器が投入されたときに三相変圧器1に発生する励磁突入電流を抑制することができる。
Claims (6)
- 三相変圧器を三相電源に対して実質的に三相同時に投入する三相遮断器において当該投入時に当該三相変圧器に発生する過渡電流としての励磁突入電流を抑制する変圧器励磁突入電流抑制装置であって、
上記三相電源の第1乃至第3相の各残留磁束値と、上記三相遮断器のプレアーク特性及び閉極時間ばらつき特性と、上記三相変圧器の上記三相遮断器が接続されている側の巻線の結線条件と、上記三相電源の各相間の電圧位相差とに基づいて、投入後の定常状態において発生する変圧器磁束の中心値の絶対値の最大値である投入磁束誤差を、上記各相に対して上記第1相の閉極位相毎に決定し、上記決定された第1乃至第3相の投入磁束誤差に関する評価値を実質的に最小にするように、上記第1相の目標閉極位相を決定する目標閉極位相決定手段と、
上記三相遮断器を上記決定された第1相の目標閉極位相のタイミングで閉極するように制御する三相遮断器制御手段とを備えたことを特徴とする変圧器励磁突入電流抑制装置。 - 上記評価値は、上記第1乃至第3相の投入磁束誤差の最大値であることを特徴とする請求項1記載の変圧器励磁突入電流抑制装置。
- 上記評価値は、上記第1乃至第3相の投入磁束誤差の和であることを特徴とする請求項1記載の変圧器励磁突入電流抑制装置。
- 上記目標閉極位相決定手段はさらに、上記第1相の閉極時間に対する他の二相の各閉極時間平均値のずれ量に基づいて上記投入磁束誤差を決定することを特徴とする請求項1乃至3のうちのいずれか1つの請求項記載の変圧器励磁突入電流抑制装置。
- 上記目標閉極位相決定手段は、上記第1の残留磁束値の上限値及び下限値と、上記第2の残留磁束値の上限値及び下限値と、上記第3の残留磁束値の上限値及び下限値と、上記三相遮断器のプレアーク特性及び閉極時間ばらつき特性と、上記三相変圧器の上記三相遮断器が接続されている側の巻線の結線条件と、上記電圧位相差とに基づいて、上記投入磁束誤差を、上記各相に対して上記第1相の閉極位相毎に決定することを特徴とする請求項1乃至4のうちのいずれか1つの請求項記載の変圧器励磁突入電流抑制装置。
- 各相の残留磁束値と上記目標閉極位相との間の関係を示すマップを格納するマップメモリをさらに備え、
上記目標閉極位相決定手段は、
上記第1乃至第3相の各残留磁束値の各組み合わせ毎に、上記第1乃至第3相の各残留磁束値と、上記三相遮断器のプレアーク特性及び閉極時間ばらつき特性と、上記三相変圧器の上記三相遮断器が接続されている側の巻線の結線条件と、上記電圧位相差とに基づいて、上記投入磁束誤差を上記各相に対して上記第1相の閉極位相毎に決定し、上記第1乃至第3相の投入磁束誤差に関する評価値を実質的に最小にするように、上記第1相の目標閉極位相を決定し、
上記第1乃至第3相の各残留磁束値の各組み合わせ毎に決定された上記第1相の目標閉極位相に基づいて上記マップを作成して予め上記マップメモリに格納し、
上記マップを参照して、上記第1乃至第3相の各残留磁束値に基づいて、上記第1相の目標閉極位相を決定することを特徴とする請求項1乃至4のうちのいずれか1つの請求項記載の変圧器励磁突入電流抑制装置。
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BRPI0919033A BRPI0919033A2 (pt) | 2008-09-26 | 2009-09-25 | aparelho de supressão de surto de corrente de transformador |
US13/121,026 US8779634B2 (en) | 2008-09-26 | 2009-09-25 | Transformer inrush current suppression apparatus with function of determining target closing phase of three-phase transformer based on pre-arc characteristic and variation in closing time of the three-phase circuit breaker |
EP09816193.8A EP2330708B1 (en) | 2008-09-26 | 2009-09-25 | Transformer inrush current suppression device |
CN2009801375168A CN102165664B (zh) | 2008-09-26 | 2009-09-25 | 变压器励磁冲击电流抑制装置 |
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CN102337557B (zh) * | 2010-07-28 | 2013-09-25 | 中国石油化工股份有限公司 | 一种交流电弧发生控制器及其应用 |
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WO2012059980A1 (ja) * | 2010-11-02 | 2012-05-10 | 三菱電機株式会社 | 位相制御開閉装置および閉極位相制御方法 |
US9385525B2 (en) | 2011-09-14 | 2016-07-05 | Kabushiki Kaisha Toshiba | Magnetizing inrush current suppression device |
Also Published As
Publication number | Publication date |
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BRPI0919033A2 (pt) | 2015-12-08 |
EP2330708A1 (en) | 2011-06-08 |
EP2330708A4 (en) | 2013-10-16 |
EP2330708B1 (en) | 2016-10-26 |
US8779634B2 (en) | 2014-07-15 |
JP4611455B2 (ja) | 2011-01-12 |
JPWO2010035778A1 (ja) | 2012-02-23 |
CN102165664B (zh) | 2013-10-02 |
CN102165664A (zh) | 2011-08-24 |
US20110204870A1 (en) | 2011-08-25 |
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