JP5147897B2 - Rectifier circuit inspection device, rectifier circuit inspection method - Google Patents

Description

  The present invention relates to a rectifier circuit inspection device and a rectifier circuit inspection method.

  Some DC power supply devices that generate a DC voltage by rectifying and smoothing an input AC voltage include a rectifier circuit and a storage battery. Such a DC power supply device is generally called an uninterruptible power supply device, and generates a DC voltage using a storage battery as a power source when no AC voltage is input (see, for example, Patent Document 1).

JP 2002-101571 A

  In the above-described DC power supply device, if a storage battery or a rectifier circuit that rectifies an AC voltage is deteriorated, a desired DC voltage may not be generated. For this reason, the storage battery is diagnosed by a technique disclosed in Patent Document 1, for example, while the DC power supply device is operating. On the other hand, the inspection of whether there is an abnormality in the rectifier circuit is generally performed while the operation of the DC power supply device is stopped. That is, when inspecting the rectifier circuit, it is necessary to stop the operation of the rectifier circuit.

  The present invention has been made in view of the above problems, and an object thereof is to provide a rectifier circuit inspection apparatus that can inspect a rectifier circuit without stopping the operation of the rectifier circuit.

To achieve the above object, a rectifier circuit device according to one aspect of the present invention includes bridge-connected first to sixth rectifier elements, and the first rectifier element of the rectifier circuit that rectifies a three-phase AC voltage. A first measurement unit that measures a first current that flows through a first wiring that is connected to a connection point between the anode and the cathode of the second rectifying element and to which one of the three-phase AC voltages is applied. And a second phase different from the first voltage, which is a one-phase voltage of the three-phase AC voltage and is connected to a connection point between the anode of the third rectifier element and the cathode of the fourth rectifier element of the rectifier circuit. A second measuring unit for measuring a second current flowing in the second wiring to which a voltage is applied, and a connection point between an anode of the fifth rectifying element and a cathode of a sixth rectifying element of the rectifier circuit; The AC voltage is a one-phase voltage, and A third measuring unit for measuring a third current flowing in a third wiring to which a third voltage different from the second voltage is applied; and a magnitude of a direct current component of the first current is equal to a direct current component of the second current A determination unit that determines that the first or second rectifying element is not operating at a predetermined timing according to a level of the three-phase AC voltage when the magnitude and the magnitude of the DC component of the third current are larger ; Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the rectifier circuit test | inspection apparatus which can test | inspect a rectifier circuit, without stopping operation | movement of a rectifier circuit can be provided.

It is a figure which shows the structure of the DC power supply device 10 which is one Embodiment of this invention. It is a figure which shows an example of the waveform of electric current Ir, Is, It when all the rectifiers are normal. It is a figure which shows an example of the waveform of electric current Ir, Is, It when a thyristor 50 carries out an open failure. It is a figure which shows an example of the waveform of electric current Ir, Is, It when a diode 60 carries out an open failure. It is a figure which shows the characteristic of electric current Ir, Is, It. It is a figure which shows the functional block which the microcomputer 82 implement | achieves. It is a flowchart which shows an example of the process which the test | inspection apparatus 25 implements. It is a flowchart which shows an example of determination process S106.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

  FIG. 1 is a diagram illustrating a configuration example of a DC power supply device 10 according to an embodiment of the present invention. The DC power supply device 10 is a device that is provided in, for example, an electric station (not shown) and generates a power source for operating a load 15 such as a relay from an input three-phase AC voltage. The flow devices 21 to 23 and the inspection device 25 are included.

  The power supply device 20 is a device that generates a desired output voltage Vout from the three-phase AC voltages Vr, Vs, and Vt, and includes a rectifier circuit 30, a capacitor 31, a storage battery 32, a control device 33, power supply lines 35 to 39, and power distribution Circuit breakers 40-45.

  The rectifier circuit 30 is a circuit that rectifies and outputs three-phase AC voltages Vr, Vs, and Vt applied to the power lines 35 to 37, and includes thyristors 50 to 52 and diodes 60 to 62. .

  A power supply line 35 to which a three-phase AC voltage Vr is applied is connected to a connection point between the anode of the thyristor 50 (first rectifier element) and the cathode of the diode 60 (second rectifier element). A power supply line 36 to which a three-phase AC voltage Vs is applied is connected to a connection point between the anode of the thyristor 51 (third rectifier element) and the cathode of the diode 61 (fourth rectifier element). A power supply line 37 to which a three-phase AC voltage Vt is applied is connected to a connection point between the anode of the thyristor 52 (fifth rectifier element) and the cathode of the diode 62 (sixth rectifier element). Further, the cathodes of the thyristors 50 to 52 are connected, and the anodes of the diodes 60 to 62 are connected. For this reason, the thyristors 50 to 52 and the diodes 60 to 62 are bridge-connected.

  The capacitor 31 smoothes the voltage rectified by the rectifier circuit 30 and generates a DC output voltage Vout. One end of the capacitor 31 is connected to the power supply line 38 via the power distribution breaker 40, and the other end of the capacitor 31 is connected to the power supply line 39 via the power distribution breaker 41.

  The storage battery 32 is connected between the power lines 38 and 39. For example, when the three-phase AC voltages Vr, Vs, and Vt are not input to the rectifier circuit 30 due to a power failure or the like, the load 15 connected to the power lines 38 and 39 is used. Supply DC power to The storage battery 32 is charged so that the battery voltage Vbat of the storage battery 32 matches the DC level of the output voltage Vout.

  The control device 33 is a device that controls the firing angles of the thyristors 50 to 52 so that the DC level of the output voltage Vout becomes a predetermined level based on the DC level of the output voltage Vout. Although details will be described later, for example, when increasing the level of the output voltage Vout, the control device 33 increases the firing angle of the thyristors 50 to 52 and extends the ON period of the thyristors 50 to 52. On the other hand, when lowering the level of the output voltage Vout, the control device 33 decreases the firing angle of the thyristors 50 to 52 and shortens the ON period of the thyristors 50 to 52.

  Moreover, the control apparatus 33 controls the thyristors 50-52 based on the instruction | indication from the test | inspection apparatus 25 mentioned later. Specifically, when an instruction to evenly charge the storage battery 32 is input from the inspection device 25, the firing angle of the thyristors 50 to 52 is increased so that the DC level of the output voltage Vout increases from the voltage V1 to the voltage V2. To do. As a result, since the battery voltage Vbat of the storage battery 32 also increases from the voltage V1 to the voltage V2, the storage battery 32 is charged equally.

  The distribution circuit breakers 40 and 41 are circuit breakers for protecting the rectifier circuit 30 and the capacitor 31 from overcurrent. Each of the power distribution circuit breakers 42 to 45 is a circuit breaker for protecting a connected load from overcurrent. Note that the load 15 such as the relay described above is connected between, for example, the power distribution breakers 42 and 43 to be supplied with the power of the output voltage Vout.

  The current transformer 21 (first measurement unit) measures the current Ir flowing through the wiring 35 (first wiring). The current transformer 22 (second measurement unit) measures the current Is flowing in the wiring 36 (second wiring), and the current transformer 23 (third measurement unit) measures the current It flowing in the wiring 37 (third wiring). Measure.

  The current transformer 24 measures the current Iout output from the capacitor 31. The current transformers 21 to 24 are so-called DC current transformers, and measure DC components and AC components of currents Ir, Is, It, and Iout.

  The inspection device 25 inspects whether or not the rectifier circuit 30 and the control device 33 are abnormal based on the measurement results of the current transformers 21 to 23. Although details will be described later, for example, when the rectifier circuit 30 operates normally, that is, when the rectifier circuit 30 operates at a timing corresponding to the level of the three-phase AC voltages Vr, Vs, and Vt input, the currents Ir and Is , It has a DC component level of zero.

  Here, the level of the direct current component of the current Ir refers to a current value when the current Ir is integrated for a period of one cycle of the three-phase AC voltage Vr, for example. The level of the direct current component of the currents Is and It is the same as the level of the direct current component of the current Ir. On the other hand, when the rectifier circuit 30 does not operate normally, that is, when the rectifier circuit 30 does not operate at a timing corresponding to the level of the three-phase AC voltages Vr, Vs, Vt to be input, the DC components of the currents Ir, Is, It Levels vary from zero. Based on such a phenomenon, the inspection device 25 detects, for example, the DC components of the currents Is, Ir, and It, and inspects whether or not the rectifier circuit 30 or the control device 33 is abnormal. The current transformers 21 to 23 and the inspection device 25 correspond to a rectifier circuit inspection device.

== About the currents Ir, Is, It ==
Here, when the firing angles of the thyristors 50 to 52 are 180 degrees, when all of the rectifying elements included in the rectifying circuit 30 are normal, and when any one of the rectifying elements has an open failure, for example. The currents Ir, Is, It will be described. Here, the power supply device 20 supplies power to a resistor (not shown) included in the relay connected as the load 15. That is, in this embodiment, a resistance load is equivalently connected between the distribution circuit breakers 42 and 43.

<< When all rectifying elements are normal >>
A case where all of the rectifying elements included in the rectifying circuit 30 are normal will be described with reference to FIG. Note that the period from time t0 to t6 is one period of each of the three-phase AC voltages Vr, Vs, and Vt. Here, the current Ir flowing from the wiring 35 to the thyristor 50 is a positive current Ir, and the current Ir flowing from the diode 60 to the wiring 35 is a negative current Ir. In addition, similarly to the current Ir, the currents Is and It are assumed to be positive currents flowing from the wiring side to the rectifier circuit 30 and vice versa.

  At time t0, the three-phase AC voltages Vr and Vt are higher than the three-phase AC voltage Vs. In this case, since the thyristors 50 and 52 and the diode 61 are turned on, the positive currents Ir and It supplied to the thyristors 50 and 52 are the distribution circuit breaker 40, the distribution circuit breaker 42, the load 15, and the distribution interruption. Is returned to the diode 61 through the power supply 43 and the power distribution breaker 41. The current fed back from the diode 61 is output as a negative current Is. In the following description, the path of the power distribution circuit breaker 40 and the like through which current flows is omitted.

  At time t1, since the three-phase AC voltages Vs and Vt are negative, the diode 61 and the diode 62 are turned on. As a result, the positive current Ir supplied to the thyristor 50 is fed back to the diodes 61 and 62 and output as the negative currents Is and It.

  At time t2, since the three-phase AC voltages Vr and Vs are positive, the thyristors 50 and 51 are turned on. As a result, the positive currents Ir and Is are fed back to the diode 62 and output as the negative current It.

  At time t3, since the three-phase AC voltages Vt and Vr are negative, the diode 62 and the diode 60 are turned on. As a result, the positive current Is supplied to the thyristor 51 is fed back to the diodes 60 and 62 and output as negative currents Ir and It.

  At time t4, since the three-phase AC voltages Vs and Vt are positive, the thyristor 51 and the thyristor 52 are turned on. Therefore, the positive currents Is and It supplied to the thyristors 51 and 52 are fed back to the diode 60 and output as the negative current Ir.

  At time t5, since the three-phase AC voltages Vr and Vs are negative, the diodes 60 and 61 are turned on. Accordingly, the positive current It supplied to the thyristor 52 is fed back to the diodes 60 and 61. The diode 60 outputs a negative current Ir, and the diode 61 outputs a negative current Is. After time t6, the operation from time t0 to time t6 is repeated.

  By the way, in a period of one cycle of the three-phase AC voltage Vr, a positive current Ir and a negative current Ir having the same magnitude flow alternately. For this reason, the direct current component of the current Ir in one cycle is zero. In addition, the currents Is and It also have a DC component level (DC level) of zero similarly to the current Ir. Thus, when the rectifier circuit 30 is normal, the levels of the direct current components of the currents Ir, Is, It are zero. Note that the level (value) of the DC component is a level based on zero amperes.

<< When Thyristor 50 is Open Failure >>
The currents Ir, Is, It when the thyristor 50 has an open failure will be described with reference to FIG. When the thyristor 50 has an open failure, the thyristor 50 is turned off until the time t0 to t2 when the thyristor 50 should be turned on. That is, the thyristor 50 does not operate (turns on) at a predetermined timing according to the levels of the three-phase AC voltages Vr, Vs, Vt.

  For this reason, the positive current Ir supplied to the thyristor 50 is zero at times t0 to t1. The positive current It supplied to the thyristor 52 is fed back to the diode 61 and output as a negative current Is.

  Also at time t1 to t2, the positive current Ir supplied to the thyristor 50 is zero as in the time t0 to t1. The positive current Is supplied to the thyristor 51 is fed back to the diode 62 and output as a negative current It. The currents Ir, Is, It during periods other than the times t0 to t2 are the same as when the thyristor 50 has not failed.

  For this reason, when the thyristor 50 has an open failure, the level of the direct current component of the current Ir per cycle is negative (for example, −I1 amperes). On the other hand, the level of the direct current component of the current Is is positive (for example, + I2 amps). Further, since the current It changes in the same manner as the current Is, the level of the direct current component of the current It is also + I2. As is clear from FIG. 3, the magnitude of the DC component I1 is larger than the magnitude of the DC component I2.

<< When the diode 60 has an open failure >>
The currents Ir, Is, It when the diode 60 has an open failure will be described with reference to FIG. When the diode 60 is in an open failure, the diode 60 is turned off from time t3 to t5 when the diode 60 should be turned on. That is, the diode 60 does not operate (turns on) at a predetermined timing according to the levels of the three-phase AC voltages Vr, Vs, and Vt.

  For this reason, from time t3 to t4, since the diode 60 is off, the current Ir becomes zero. During this period, the positive current Is supplied to the thyristor 51 is fed back to the diode 62 and output from the diode 62 as a negative current It.

  Also from time t4 to t5, the current Ir becomes zero similarly to time t3 to t4. In this period, the positive current It supplied to the thyristor 52 is fed back to the diode 61 and output as a negative current Is. As a result, when the diode 60 has an open failure, the level of the direct current component of the current Ir per cycle is, for example, + I1. On the other hand, the level of the DC component of the currents Is and It is, for example, -I2.

  As described above, when one of the thyristor 50 or the diode 60 connected to the wiring 35 through which the current Ir flows is opened and the thyristor 50 or the like does not operate at a predetermined timing, the magnitude of the direct current component of the current Ir is increased. , Larger than the other currents Is and It. Here, the magnitude of the DC component is an absolute value of the level of the DC component (DC level).

== Characteristics of currents Ir, Is, It ==
FIG. 5 is a graph summarizing the characteristics of the currents Ir, Is, It when the rectifying element of the rectifying circuit 30 is normal and when any one of them has an open circuit failure. For example, when the thyristor 51 fails, the level of the direct current component of the current Is becomes −I1 and the level of the direct current components of the currents Ir and It becomes + I2, as in the case where the thyristor 50 fails. On the other hand, when the diode 61 fails, the level of the DC component of the current Is becomes + I1 and the level of the DC components of the currents Ir and It becomes −I2, as in the case where the diode 60 fails.

  Further, when the thyristor 52 fails, the level of the direct current component of the current It becomes −I1 and the level of the direct current components of the currents Ir and Is becomes + I2, as in the case where the thyristor 50 fails. On the other hand, when the diode 62 fails, the level of the direct current component of the current It becomes + I1 and the level of the direct current components of the currents Ir and Is becomes −I2 as in the case where the diode 60 fails.

  Although the case where the rectifying element has an open failure has been described here, for example, the case where the control device 33 fails and the thyristors 50 to 52 cannot be turned on is the same as that shown in FIG. For this reason, when a failure occurs in the control device 33 and the thyristors 50 to 52 cannot be turned on, the currents Ir, Is, and It change as in the case where the thyristors 50 to 52 are open.

== Details of Inspection Device 25 ==
Details of the inspection apparatus 25 shown in FIG. 1 will be described here. The inspection device 25 inspects whether the rectifier circuit 30 and the control device 33 are abnormal based on the currents Ir, Is, It.

  The inspection device 25 includes an AD converter (ADC) 80, a storage device 81, a microcomputer 82, an interface circuit (IF) 83, and a display 84.

  The AD converter 80 converts the analog currents Ir, Is, It, and Iout measured by the current transformers 21 to 24 into digital values. The storage device 81 stores program data executed by the microcomputer 82 and various data.

  The microcomputer 82 implements various functions by executing the program data stored in the storage device 81. Specifically, the microcomputer 82 implements the functions of the determination unit 90 and the processing unit 91 as shown in FIG. The AD converter 80 and the determination unit 90 correspond to a determination unit.

  The determination unit 90 determines whether there is an abnormality in the rectifier circuit 30 or the control device 33 based on the digitized currents Ir, Is, It. As described above, the direct current components of the currents Ir, Is, It have characteristics as shown in FIG. Therefore, the determination unit 90 integrates the input currents Ir, Is, It for, for example, one period of the three-phase AC voltage Vr, and calculates the level of the DC component and the magnitude of the DC component. Further, the determination unit 90 determines that there is an abnormality in the rectifier circuit 30 or the control device 33 when the magnitude of one DC component is larger than the magnitudes of the other two DC components. In the present embodiment, when the size of one DC component is larger than the size of the other DC component by a predetermined factor (for example, 1.3 times), the rectifier circuit 30 or the control device 33 is abnormal. Judgment is made. In general, the level of the DC component of the currents Ir, Is, It varies according to the current flowing through the load 15, for example. For this reason, for example, by comparing the magnitude of one DC component with a predetermined multiple of the magnitude of the other DC component, even if the level of the DC component of the currents Ir, Is, It varies, the accuracy is increased. It is possible to detect whether the rectifier circuit 30 or the control device 33 is abnormal.

  For example, when the magnitude of the direct current component of the current Ir is larger than the magnitude of the direct current components of the currents Is and It, the determination unit 90 determines that the thyristor 50 or the diode 60 is not operating at a predetermined timing. . As a result, it is determined that any of the thyristor 50, the diode 60, or the control device 33 is abnormal. Furthermore, when the DC component level of the current Ir is the largest and the level of the DC component of the current Ir is smaller than a predetermined value of 0 amperes, the determination unit 90 determines that the thyristor 50 has a predetermined timing. Determine that it is not working. As a result, it is determined that the thyristor 50 or the control device 33 is abnormal. On the other hand, the determination unit 90 determines that the diode 60 is not operating at a predetermined timing when the level of the direct current component of the current Ir is greater than 0 amperes. As a result, it is determined that the diode 60 is abnormal.

  The determination unit 90 determines that the thyristor 51 or the diode 61 is not operating at a predetermined timing when the magnitude of the DC component of the current Is is larger than the magnitude of the DC components of the currents Ir and It. . As a result, it is determined that any of the thyristor 51, the diode 61, or the control device 33 is abnormal. Further, the determination unit 90 determines that the thyristor 51 is not operating at a predetermined timing when the level of the direct current component of the current Is is the largest and the level of the direct current component of the current Is is smaller than 0 amperes. judge. As a result, it is determined that the thyristor 51 or the control device 33 is abnormal. On the other hand, when the level of the direct current component of the current Is is greater than 0 amperes, the determination unit 90 determines that the diode 61 is not operating at a predetermined timing and the diode 60 is abnormal.

  Furthermore, the determination unit 90 determines that the thyristor 52 or the diode 62 is not operating at a predetermined timing when the magnitude of the DC component of the current It is larger than the magnitude of the DC components of the currents Ir and Is. . The determination unit 90 determines that the thyristor 52 is not operating at a predetermined timing when the level of the direct current component of the current It is the largest and the level of the direct current component of the current It is smaller than 0 amperes. judge. As a result, it is determined that the thyristor 52 or the control device 33 is abnormal. On the other hand, when the level of the direct current component of the current It is greater than 0 amperes, the determination unit 90 determines that the diode 62 is not operating at a predetermined timing and the diode 60 is abnormal.

  The processing unit 91 detects the level of the direct current component of the current Iout. When the level of the direct current component is smaller than a predetermined value, the processing unit 91 issues an equal charge instruction for starting the equal charge of the storage battery 32 via the interface circuit 83. Output to the control device 33. In addition, when the equal charge of the storage battery 32 is started, the firing angle of the thyristors 50 to 52 is increased as described above, and the DC level of the current Iout is increased. Further, the processing unit 91 causes the display 84 to display the magnitude and level of the direct current component of the currents Ir, Is, It calculated by the determination unit 90. Further, when the determination unit 90 determines that the rectifier circuit 30 or the control device 33 is abnormal, the processing unit 91 records the waveforms of the currents Ir, Is, It, DC components, and the determined time in the storage device 81. To do. Further, when the determination unit 90 determines that there is an abnormality in the rectifier circuit 30 or the like, the processing unit 91 outputs an alarm indicating that there is an abnormality to the interface circuit 83.

  The interface circuit 83 outputs an equal charge instruction to the control device 33 based on an instruction from the processing unit 91, and outputs an alarm to the outside of the DC power supply device 10.

  The display 84 is a display panel that displays the waveforms of currents Ir, Is, It, the level of DC components, and the like. For this reason, for example, a user can also determine the presence or absence of abnormality of the rectifier circuit 30 or the control apparatus 33 by checking the panel of the indicator 84. FIG.

== Example of processing of inspection device 25 ==
Here, an example of processing in which the inspection device 25 inspects whether there is an abnormality in the rectifier circuit 30 or the control device 33 will be described with reference to FIG. For example, the inspection device 25 executes the process shown in FIG. 7 at predetermined intervals. 7 is a functional block realized by the microcomputer 82.

  First, the processing unit 91 detects the level of the direct current component of the current Iout (S100). Then, the processing unit 91 determines whether or not the level of the direct current component of the current Iout is greater than or equal to a predetermined level (S101). If the DC level is greater than or equal to the predetermined level (S101: YES), the determination unit 90 calculates the level and magnitude of the DC component of the currents Ir, Is, It (S104). On the other hand, when the level of the direct current component of the current Iout is not equal to or higher than the predetermined level (S101: NO), the processing unit 91 outputs an equal charge instruction to start equal charge of the storage battery 23 (S102). When the process S102 is executed, since the equal charge of the storage battery 23 is started, the current Iout starts to increase. Then, when a certain time required for the current Iout to sufficiently increase has elapsed (S103: YES), the processing unit 91 causes the determination unit 90 to calculate the level and magnitude of the direct current components of the currents Ir, Is, It ( S104).

  For example, even when there is an abnormality in the rectifier circuit 30 or the like, if the current flowing through the load 15 is small and the current Iout is small, the change in the level of the direct current component of the currents Ir, Is, It is generally small. Therefore, in the present embodiment, even charging is performed when the current Iout is small so that the level of the direct current component of the currents Ir, Is, It greatly changes when the rectifier circuit 30 or the like is abnormal.

  When the process S104 is executed, the processing unit 91 displays the waveforms of the currents Ir, Is, It, the DC component levels of the currents Ir, Is, It calculated by the determination unit 90, and the like on the display 84. (S105). Then, the determination unit 90 performs a determination process as to whether or not there is an abnormality in the rectifier circuit 30 or the control device 33 based on the direct current components of the currents Ir, Is, and It (S106).

  Here, the determination process S106 is, for example, a process as shown in FIG. Details of the determination process will be described below. First, the determination unit 90 determines whether there is a current in which the magnitude of one DC component of the currents Ir, Is, It is larger than a predetermined multiple of the magnitudes of the other two DC components (S200). . When there is no current in which the magnitude of one DC component is larger than a predetermined multiple of the magnitudes of the other two DC components (S200: NO), the determination unit 90 includes the rectifier circuit 30 and the control device 33. It is determined that there is no abnormality (S201).

  On the other hand, when there is a current in which the magnitude of one DC component is larger than a predetermined multiple of the magnitudes of the other two DC components (S200: YES), the determination unit 90 determines the corresponding current (S202). .

  When the current corresponding to the process S202 is the current Ir (S202: Ir), the determination unit 90 compares whether the current Ir is larger than zero ampere (S203). When the current Ir is smaller than zero ampere (S203: minus), the determination unit 90 determines that there is an abnormality in the thyristor 50 or the control device 33 that controls the thyristor 50 (S204). On the other hand, when the current Ir is larger than zero ampere (S203: plus), the determination unit 90 determines that the diode 60 is abnormal (S205).

  When the current corresponding to the process S202 is the current Is (S202: Is), the determination unit 90 compares whether or not the current Is is greater than zero ampere (S206). When the current Is is smaller than zero ampere (S206: minus), the determination unit 90 determines that there is an abnormality in the thyristor 51 or the control device 33 that controls the thyristor 51 (S207). On the other hand, when the current Is is greater than zero ampere (S206: plus), the determination unit 90 determines that the diode 61 is abnormal (S208).

  When the current corresponding to the process S202 is the current It (S202: It), the determination unit 90 compares whether the current It is greater than zero ampere (S209). When the current It is smaller than zero ampere (S209: minus), the determination unit 90 determines that there is an abnormality in the thyristor 52 or the control device 33 that controls the thyristor 52 (S210). On the other hand, when the current It is greater than zero ampere (S209: plus), the determination unit 90 determines that the diode 62 is abnormal (S211).

  As shown in FIG. 7, when the determination unit 90 determines that there is an abnormality (S107: YES), the processing unit 91 determines the waveform of the currents Ir, Is, It, and the level of the direct current component of the currents Ir, Is, It. Alternatively, the determined time is recorded in the storage device 81, and an alarm indicating that there is an abnormality is output (S108). On the other hand, when the determination unit 90 determines that there is no abnormality (S107: NO), the process ends.

  The DC power supply device 10 including the inspection device 25 according to the present embodiment has been described above. The inspection device 25 determines whether or not there is an abnormality in the rectifier circuit 30 included in the DC power supply device 10 based on the measurement results measured by the current transformers 21 to 23. However, for example, based on only one of the measurement results measured by the current transformers 21 to 23, the rectifier circuit 30 has a predetermined timing corresponding to the levels of the three-phase AC voltages Vr, Vs, and Vt. It may be determined whether or not to operate. When the rectifier circuit 30 is abnormal, the currents Ir, Is, It in one cycle change as shown in FIGS. For this reason, for example, it can be determined whether the rectifier circuit 30 is operating at a predetermined timing based on the effective value or average value of the current Ir. In such a case, the abnormality of the rectifier circuit 30 can be detected without stopping the operation of the rectifier circuit 30. When an abnormality is detected, the user can stop the DC power supply device 10 and replace a failed element or the like. For this reason, since it is possible to prevent the DC power supply device 10 from operating in a state where the rectifier circuit 30 has failed, the burden on the DC power supply device 10 can be reduced. Further, when the failed element is replaced, the ripple current in the current Iout becomes small. For this reason, the influence on the load driven by the DC power supply device 10 is also reduced.

  Further, as shown in FIG. 5, when all rectifying elements of the rectifying circuit 30 are normal, the level of the direct current component of the current Ir is zero. However, when any rectifying element of the rectifying circuit 30 is abnormal and the rectifying element does not turn on at a predetermined timing, the magnitude of the direct current component of the current Ir changes from zero to I1 or I2. Therefore, the inspection device 25 may determine whether or not there is an abnormality in the rectifier circuit 30 based only on the magnitude of the current Ir, for example.

  Further, the inspection device 25 may determine whether or not the rectifier circuit 30 is abnormal based on whether or not the magnitude of the current Ir exceeds a predetermined range of, for example, I1 amperes. Specifically, the determination unit 90 determines that the rectifier circuit 30 is not operating at a predetermined timing when the magnitude of the current Ir exceeds a predetermined range I1, and the magnitude of the current Ir If I1 is not exceeded, it may be determined that the rectifier circuit 30 is operating at a predetermined timing. Thus, even when not measuring all the currents Ir, Is, and It, it is possible to determine whether or not there is an abnormality in the rectifier circuit 30 without stopping the operation of the rectifier circuit 30.

  The determination unit 90 determines whether the rectifying element of the rectifier circuit 30 is operating at a predetermined timing based on the direct current components of the currents Ir, Is, It, but is not limited thereto. For example, the effective values of the currents Ir, Is, It change in the same manner as the levels of the direct current components of the currents Ir, Is, It. For this reason, for example, the determination unit 90 may determine whether each rectifying element is operating at a predetermined timing based on the effective values of the currents Ir, Is, and It.

  Further, when the magnitude of the direct current component of the current Ir is larger than the magnitude of the direct current components of the currents Is and It, the determination unit 90 determines that either the thyristor 50 or the diode 60 is not operating at a predetermined timing. (For example, process S202: Ir). Therefore, the inspection device 25 can determine that the thyristor 50 or the diode 60 among the rectifying elements of the rectifying circuit 30 is abnormal or that the control device 33 has failed.

  Further, the determination unit 90 determines that the thyristor 50 or the control device 33 is abnormal when the value of the direct current component of the current Ir is lower than 0, and the diode 90 determines that the value of the direct current component of the current Ir is higher than 0. 60 is determined to be abnormal (for example, processing S203 to S205). In this way, the inspection device 25 can identify the abnormal part in more detail.

  The determination unit 90 determines that either the thyristor 51 or the diode 61 is not operating at a predetermined timing when the magnitude of the DC component of the current Is is larger than the magnitude of the DC components of the currents Ir and It. (For example, process S202: Is). For this reason, the inspection device 25 can determine that the thyristor 51 or the diode 61 among the rectifying elements of the rectifying circuit 30 is abnormal or that the control device 33 has failed.

  The determination unit 90 determines that the thyristor 51 or the control device 33 is abnormal when the value of the DC component of the current Is is lower than 0, and when the value of the DC component of the current Is is higher than 0, It is determined that there is an abnormality in the diode 61 (for example, processing S206 to S208). In this way, the inspection device 25 can identify the abnormal part in more detail.

  The determination unit 90 determines that either the thyristor 52 or the diode 62 is not operating at a predetermined timing when the magnitude of the direct current component of the current It is greater than the magnitude of the direct current components of the currents Ir and Is. (For example, process S202: It). For this reason, the inspection device 25 can determine whether the thyristor 52 or the diode 62 is abnormal among the rectifying elements of the rectifying circuit 30 or the control device 33 has failed.

  Further, the determination unit 90 determines that the thyristor 52 or the control device 33 is abnormal when the value of the direct current component of the current It is lower than 0, and when the value of the direct current component of the current It is higher than 0, It is determined that there is an abnormality in the diode 62 (for example, processing S209 to S211). In this way, the inspection device 25 can identify the abnormal part in more detail.

  Further, the current Ir may be measured by the current transformer 21, and it may be determined whether or not the rectifier circuit 30 is operating at a predetermined timing based on the measurement result of the current transformer 21. Specifically, the operation of the rectifier circuit 30 can be determined by displaying the waveform of the current Ir on the display 84 and comparing it with the waveform of the current Ir when the rectifier circuit 30 is normal.

  The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention is changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  For example, as shown in FIG. 2, the peak values of currents Ir, Is, and It are output every 120 degrees. Therefore, the determination unit 90 determines, for example, whether or not the phase difference between the peak values of the currents Ir, Is, and It is 120 degrees, and determines whether or not there is an abnormality in the rectifier circuit 30 or the like. May be.

  The current transformers 21 to 23 and the inspection device 25 are provided inside the DC power supply device 10, but may be provided outside. Further, the rectifier circuit 30 may be configured entirely with diodes or may be configured with all thyristors. Further, an abnormality such as a rectifier circuit included in a general AC-DC converter that does not include the storage battery 32 can be detected by using the current transformers 21 to 23 and the inspection device 25.

  Further, the determination unit 90 may determine whether the level of the direct current component of the corresponding current is greater than or less than zero before executing S202 of the determination process. Even when the determination processing is performed in such an order, it can be determined that the rectifier circuit 30 or the control device 33 is out of order.

DESCRIPTION OF SYMBOLS 10 DC power supply device 20 Power supply device 21-24 Current transformer 25 Inspection apparatus
DESCRIPTION OF SYMBOLS 30 Rectification circuit 31 Capacitor 32 Storage battery 33 Control apparatus 35-39 Power supply line 40-45 Distribution circuit breaker 50-52 Thyristor 60-62 Diode 80 AD converter 81 Memory | storage device 82 Microcomputer 83 Interface circuit 84 Display 90 Determination part 92 Processing part

Claims (7)

A bridge-connected first to sixth rectifier element, connected to a connection point between the anode of the first rectifier element and the cathode of the second rectifier element of the rectifier circuit for rectifying a three-phase AC voltage; A first measurement unit for measuring a first current flowing in the first wiring to which the first voltage of any one of the first voltage is applied;
A second voltage that is a one-phase voltage of the three-phase AC voltage and is different from the first voltage is connected to a connection point between the anode of the third rectifier element and the cathode of the fourth rectifier element of the rectifier circuit. A second measuring unit for measuring a second current flowing in the applied second wiring;
The third rectifier circuit is connected to a connection point between the anode of the fifth rectifier element and the cathode of the sixth rectifier element, and is a one-phase voltage of the three-phase AC voltage and is different from the first and second voltages. A third measuring unit for measuring a third current flowing in the third wiring to which the voltage is applied;
When the magnitude of the direct current component of the first current is greater than the magnitude of the direct current component of the second current and the magnitude of the direct current component of the third current, the first or second rectifier element is the three-phase alternating voltage. A determination unit that determines that the device does not operate at a predetermined timing according to the level of
A rectifier circuit inspection apparatus comprising: The rectifier circuit inspection device according to claim 1,
The determination unit
Rectification not operating at a predetermined timing according to the level of the three-phase AC voltage among the first and second rectifying elements based on whether the value of the DC component of the first current is higher or lower than a predetermined value Determining the element ;
A rectifier circuit inspection device. The rectifier circuit inspection device according to claim 1 or 2,
The determination unit
When the magnitude of the direct current component of the second current is larger than the magnitude of the direct current component of the first current and the magnitude of the direct current component of the third current, the third or fourth rectifying element is connected to the three-phase alternating current voltage. Determining that it is not operating at a predetermined timing according to the level of
A rectifier circuit inspection device. The rectifier circuit inspection device according to claim 3 ,
The determination unit
Rectification not operating at a predetermined timing according to the level of the three-phase AC voltage among the third and fourth rectifying elements based on whether the value of the DC component of the second current is higher or lower than a predetermined value Determining the element ;
A rectifier circuit inspection device. A rectifier circuit inspection apparatus according to any one of claims 1 to 4 ,
The determination unit
When the magnitude of the direct current component of the third current is larger than the magnitude of the direct current component of the first current and the magnitude of the direct current component of the second current, the fifth or sixth rectifying element is connected to the three-phase alternating current voltage. Determining that it is not operating at a predetermined timing according to the level of
A rectifier circuit inspection device. The rectifier circuit inspection device according to claim 5,
The determination unit
Rectification not operating at a predetermined timing according to the level of the three-phase AC voltage among the fifth and sixth rectifying elements based on whether the value of the DC component of the third current is higher or lower than a predetermined value Determining the element;
A rectifier circuit inspection device. A bridge-connected first to sixth rectifier element, connected to a connection point between the anode of the first rectifier element and the cathode of the second rectifier element of the rectifier circuit for rectifying a three-phase AC voltage; Measuring a first current flowing in the first wiring to which the first voltage of any one of the phases is applied,
A second voltage that is a one-phase voltage of the three-phase AC voltage and is different from the first voltage is connected to a connection point between the anode of the third rectifier element and the cathode of the fourth rectifier element of the rectifier circuit. Measure the second current flowing in the applied second wiring,
The third rectifier circuit is connected to a connection point between the anode of the fifth rectifier element and the cathode of the sixth rectifier element, and is a one-phase voltage of the three-phase AC voltage and is different from the first and second voltages. Measure the third current flowing in the third wiring to which the voltage is applied,
When the magnitude of the direct current component of the first current is greater than the magnitude of the direct current component of the second current and the magnitude of the direct current component of the third current, the first or second rectifier element is the three-phase alternating voltage. Determining that it is not operating at a predetermined timing according to the level of
A method of inspecting a rectifier circuit.

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