JP2013034276A - Electric power unit and nuclear reactor control rod control apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power unit that reduces influence of an excessive current during a start of control rod driving to a three-phase AC power source on a primary side of an electric power unit for nuclear reactor control rod control by improving the maintainability of the electric power unit.SOLUTION: The electric power unit includes a plurality of first units 2 which are connected in parallel to a three-phase AC power source 1, and a starting sequence 5 of controlling the first units 2. Each first unit 2 is provided with a plurality of second units 12 which are connected in parallel through a breaker 10 and the second units 12 are provided with a rectifier 14, a capacitor 17 for energy absorption, and a current control circuit 20 which controls excitation of a load 19 connected to the first unit 2. The starting sequence 5 makes an excessive current of the capacitor 17 for energy absorption less than a predetermined current during the start.

Description

  The present invention relates to a power supply apparatus for exciting a load formed by a plurality of coils and the like, and a control rod used for controlling the thermal output of the nuclear reactor using the power supply apparatus and stopping the nuclear reactor. The present invention relates to a nuclear reactor control rod control device that controls a control rod drive coil for insertion into or withdrawal from the inside.

One example of a power supply device that excites and interrupts a plurality of coil loads is a motor power generator (hereinafter referred to as MG) that includes a motor and a generator as a coil power source for driving a reactor control rod. The reason why MG is used is that if the system power supply voltage drops for some reason, it becomes difficult to control the reactor control rod, and the reactor control rod is inserted into the reactor to suppress the nuclear reaction. This is to prevent the furnace from tripping. When the nuclear reactor operation is to be stopped during periodic inspections of the nuclear reactor, etc., the control rod drive coil is cut off by the trip breaker on the MG output side, and the reactor control rod is placed in the fuel tube row. Is inserted to trip the reactor. A technique of a nuclear reactor control rod control apparatus using such an MG power source is disclosed (for example, Patent Document 1). This patent document 1 is provided with a control panel for storing a circuit unit of a current control circuit for a control rod driving coil, and a plurality of switches for opening and closing power supply to the circuit unit. Electric power is converted into direct current by a rectifier, and the current of the control rod driving coil is controlled through a capacitor.
On the other hand, a reactor control rod control device in which MG is made stationary is also shown (for example, Patent Document 2).

Japanese Patent No. 4197486 JP 2003-050290 A

The technique disclosed in Patent Document 1 converts AC power into DC with a three-phase full-wave rectifier, and performs switching control of the excitation current of the control rod drive coil between the positive line and the negative line on the output side. A series circuit of one insulated gate transistor and a backflow preventing diode, a series circuit of the other backflow preventing diode and an insulated gate transistor, and a capacitor are connected to each other. When the gate type transistor cuts off the coil excitation current, the gate type transistor switches the stored energy release of the control rod driving coil to the positive line side. The capacitor functions as an energy absorbing capacitor and absorbs energy stored in the coil when the exciting current is cut off.
Since this energy absorbing capacitor is not provided with an initial charging circuit, a large initial charging current flows through the capacitor at the start of excitation of the coil, but this current must be supplied from the power source.
In the technique disclosed in Patent Document 1, since the power source is configured by MG, the power source impedance is large, and the initial charging current of the capacitor is relaxed by the power source impedance. In addition, since MG generally has a large overload capability, it can sufficiently withstand the initial charging current. However, the MG power source requires a lot of time for maintenance, is a noise generation source, has problems such as adversely affecting the environment including during maintenance, and dedicating a large space.

  Patent Document 2 is made to solve the above-mentioned problems, and is an application of applying an uninterruptible power source to the power source to improve maintenance workability. If the power supply equipment is large enough, the in-house power receiving equipment becomes large and the cost is high. In the case of a power source that does not have a large impedance such as UPS, the initial charging current to the capacitor becomes large, and the power is received from the system. However, there is a problem that the in-house power supply facility is enlarged.

  This invention has been made to solve the above-described problems, and adopts a static power supply to make the DC power of the three-phase AC power input from the in-house power supply equipment receiving power from the system, Provided are a power supply device capable of suppressing a transient current flowing in a power supply at the start of coil excitation, and a reactor control rod control device using the power supply device.

1st invention is a power supply device which supplies direct-current power to load, Comprising:
A plurality of first units connected in parallel to a three-phase AC power source from an external power source, and a startup sequence for controlling the first unit;
The first unit is provided with a second unit arranged in parallel and connected to a load for each unit via a circuit breaker that opens and closes a three-phase AC power source. A rectifier that rectifies the output of the phase AC power supply, an energy absorbing capacitor that is connected to the positive line and the negative line on the output side of the rectifier and absorbs energy accumulated in the load when the exciting current to the load is interrupted; And a current control circuit that is connected to the absorption capacitor and controls the excitation current to the load.In the start-up sequence, the transient current that flows through the energy absorption capacitor at the start of excitation of the load is less than a predetermined value. A sequence for controlling the first unit is provided.

A second invention is a power supply device for supplying DC power to a load,
The power supply device is provided with a first unit arranged in parallel and connected to a three-phase AC power supply, and a startup sequence for controlling the first unit,
The first unit includes a second unit arranged in parallel and connected to a load for each unit. The second unit includes a circuit breaker that opens and closes an output from a three-phase AC power source. A rectifier that rectifies the output of the three-phase AC power source, and an energy absorbing capacitor that is connected to the positive line and the negative line on the output side of the rectifier and absorbs energy accumulated in the load when the excitation current to the load is interrupted, And a current control circuit connected to the energy absorbing capacitor to control the exciting current to the load. In the start-up sequence, the transient current flowing through the energy absorbing capacitor at the start of excitation of the load becomes a predetermined value or less. Thus, a sequence for controlling the first unit is provided.

  A third invention is a reactor control rod control device using the power supply device according to the first and second inventions, wherein the load is a reactor control rod drive coil, and the first and second inventions are used. The reactor control rod drive coil is excited by the power supply device, and the reactor control rod is driven and controlled to a predetermined position.

Since the power supply apparatus according to the first and second inventions has the above-described configuration, it can be started up so as not to exceed the current capacity of the three-phase AC power supply, and various power supply devices provided in the three-phase AC power supply It is possible to prevent overheating of the device, malfunction of the breaker, and the like, and achieve miniaturization of the devices.
In addition, since the reactor control rod control device according to the third invention is configured using the power supply device according to the first and second inventions, the control stability is improved in addition to the same effects as described above. There is an effect of doing.

1 is a block diagram illustrating a power supply device according to a first embodiment. FIG. 3 is a block diagram showing a first unit of the power supply device according to the first embodiment. FIG. 6 is a block diagram showing a power supply device according to a second embodiment. FIG. 6 is a block diagram showing a first unit of a power supply device according to a second embodiment. FIG. 10 is a block diagram illustrating a power supply device according to a third embodiment. FIG. 10 is a block diagram showing a power supply device according to a fourth embodiment. FIG. 10 is a block diagram showing a power supply device according to a fifth embodiment. FIG. 10 is a block diagram showing a first unit of a power supply device according to a fifth embodiment. FIG. 10 is a block diagram showing a power supply device according to a sixth embodiment. FIG. 10 is a block diagram showing a first unit of a power supply device according to a sixth embodiment. FIG. 10 is a block diagram showing a power supply device according to a seventh embodiment. FIG. 20 is a block diagram showing a power supply device according to an eighth embodiment.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a power supply apparatus 100 inputs a three-phase AC power supply 1 from a power receiving facility provided in a nuclear power plant (not shown) connected to a power system that is an external power supply. Therefore, the current capacity of the three-phase AC power source 1 is limited. In the power supply device 100, a plurality of first units 2 to which power is supplied via a trip breaker 6 connected to the three-phase AC power source 1 are connected in parallel, and the number of parallel units is N. An activation sequence 5 having a sequence for controlling activation of a plurality of control rod drive coils (hereinafter referred to as coils) 18, which will be described later, to suppress transient current at the start of excitation, Connected to unit 2.
A detailed configuration of the first unit 2 is shown in FIG. A plurality of second units 12 are connected in parallel to the first unit 2 via a circuit breaker 10 and a transformer 11, and the number of parallel units is M. The second unit 12 includes a rectifier 14 that converts three-phase AC power input from the three-phase AC power source 1 into DC power, and an output-side positive line 15 and a negative-side line 16 of the rectifier 14. An energy absorbing capacitor 17 for supplying an initial charging current exceeding the capacity of the rectifier 14 and a current control circuit 20 for controlling a current for exciting the coil 18 are provided. A signal is supplied to the current control circuit 20 from a current control signal generating means (not shown). In FIG. 2 and the embodiment to be described later, the coil 18 as the load 19 is also described in the second unit 12. It is provided on the control rod in the reactor.
The power supply device 100 is not provided with an initial charging circuit that charges the energy absorbing capacitor 17 in advance.

  The energy absorbing capacitor 17 absorbs energy accumulated in the coils 18 when the exciting currents of the plurality of coils 18 are cut off. Therefore, the energy absorbing capacitor 17 needs to have a capacity sufficient to absorb the coil energy, and a capacitor having a large capacity is required depending on the size and number of the coils 18. As a result, when the power supply device 100 is started, an initial charging current exceeding the capacity of the rectifier 14, that is, the three-phase AC power supply 1 flows to the energy absorbing capacitor 17.

The power supply device 100 having the configuration of the first embodiment drives the reactor control rod by energizing each coil 18 after completing the inspection of the reactor control rod, for example, at the time of periodic inspection of the nuclear power plant. To set to a predetermined position. A startup sequence 5 including a sequence for starting the power supply device 100 so that the initial charging current of the energy absorbing capacitor 17 does not exceed the current capacity of the three-phase AC power source 1 is provided. In this startup sequence 5, when the trip circuit breaker 6 of the power supply device 100 is turned on, a command from a control unit (not shown) is used to prevent all of the energy absorbing capacitors 17 from being connected at once and exceeding the power supply capacity. Alternatively, the self-internal command is used to open the circuit breakers 10 in all the first units 2 at the start of the activation of the power supply device 100, and then sequentially turn on the circuit breakers 10 to start them up at once. By reducing the number of energy absorbing capacitors 17 and reducing the initial charging current of the energy absorbing capacitor 17 that flows transiently when the circuit breaker 10 is turned on, the current capacity of the three-phase AC power source 1 is changed to the three-phase AC power source 1. It is possible to start up to an allowable predetermined value or less. Here, the number of the second units 12 and the number of coils 18 excited by each one of the second units 12 are set by the capacity of the energy absorbing capacitor 17 and the current capacity of the three-phase AC power supply 1. It is.
The circuit breaker 10 is provided with a circuit suitable for an initial charging current of the energy absorbing capacitor 17 and a magnetizing inrush current of the transformer 11 that flows transiently. The energy absorbing capacitor 17 also functions as a DC smoothing capacitor.
As described above, since the power supply device 100 according to the first embodiment sequentially turns on the circuit breakers 10 of the plurality of second units 12 at the time of startup, a predetermined value that does not exceed the current capacity of the three-phase AC power supply 1. It is possible to start the system so that the stability is as follows, and the stability of the power supply device 100 is improved, and adverse effects on the in-house three-phase AC power supply 1 that receives power from the system, such as overheating of the power supply and malfunction of the breaker, can be prevented. There is an effect that the various devices of the in-house three-phase AC power source 1 can be downsized as compared with the conventional one.

Embodiment 2. FIG.
In the second embodiment, the initial charging current of the energy absorbing capacitor 17 is the same as that of the three-phase AC power source 1 when the power supply device 100 is started, that is, when the excitation of the coil 18 is started. A start-up sequence 5 for starting up so as not to exceed the current capacity is provided, and when the trip circuit breaker 6 is turned on, all the capacitors are not connected at once.
As shown in FIG. 3, the power supply apparatus 100 according to the second embodiment is provided with a first unit 2a in place of the first unit 2 according to the first embodiment described above. This is the same as the first embodiment. The detailed configuration of the first unit 2a will be described with reference to FIG.
A plurality of second units 12a are connected in parallel to the first unit 2a, and the number of parallel units is M.
The first unit 2 of the first embodiment described above has a configuration in which a plurality of second units 12 are linked to one circuit breaker 10, but in this second embodiment, FIG. As shown, the circuit breaker 10 is provided in each of the plurality of second units 12a. That is, in the first embodiment, each second unit 12 is connected to the transformer 11 connected to the circuit breaker 10 that inputs power via the trip circuit breaker 6. Each of the second units 12a is connected to a transformer 11 that inputs power via a device 6, and the output of the transformer 11 is input to a circuit breaker 10 provided for each second unit 12a. Is.
The rest is the same as the second unit 12 of the first embodiment described above, and a description thereof will be omitted.

Next, the operation will be described.
At the start of activation of the power supply device 100, the trip circuit breaker 6 and all the circuit breakers 10 in each second unit 12a are opened by the command of the activation sequence 5. Then trip trip circuit breaker 6 is turned on. As a result, the transformer 11 provided in the first unit 2 a is connected to the three-phase AC power source 1. At this time, the magnetizing inrush current flows transiently through the transformer 11, but since the circuit breaker 10 is in an open state, the energy absorbing capacitor 17 is not yet connected, and the energy absorbing capacitor 17 is initially charged. No current flows.
Subsequently, the circuit breakers 10 in the second unit 12a are sequentially turned on. 4 are arranged in parallel. For example, after the circuit breaker 10 of the second unit 12a in the uppermost stage shown in FIG. 4 is turned on and the transient phenomenon has subsided, the second stage in FIG. The circuit breaker 10 of the second unit 12a is inserted. By sequentially turning on and starting the circuit breaker 10 in this manner, the initial charging current flowing through the energy absorbing capacitor 17 can be reduced, and as a result, the current capacity of the three-phase AC power source 1 can be started up so as not to exceed. It becomes possible.
Further, since the transformer 11 and the three-phase AC power source 1 are already connected before the circuit breaker 10 is turned on, the current due to the turning on of the circuit breaker 10 is only the initial charging current to the energy absorbing capacitor 17. The magnetizing inrush current of the transformer 11 does not flow. Therefore, in addition to the effect of the first embodiment, the three-phase AC power source 1 in the plant that receives power from the system is further reduced in capacity and size.

Embodiment 3 FIG.
Next, a third embodiment will be described.
The power supply device 100 of the first embodiment described above directly inputs the three-phase AC power source 1 that is an in-house power receiving facility that is input from the system. In the third embodiment, the power source device 100 is connected to the three-phase AC power source 1. The uninterruptible power supply 30 is provided in the power supply apparatus 100.
Hereinafter, description will be given based on FIG.
As shown in FIG. 5, the power supply device 100 is provided with an uninterruptible power supply (hereinafter referred to as UPS) 30, a trip circuit breaker 6 connected thereto, a plurality of first units 2, and a startup sequence 5. . Except for the UPS 30, it is the same as that of FIG. The UPS 30 includes a rectifier 21 and an inverter 22. The rectifier 21 converts AC power from the three-phase AC power supply 1 into DC power, and the inverter 22 converts this DC power into AC power. In addition, since the storage battery 23 is built in and power is supplied from the storage battery 23 to the load when an instantaneous power failure occurs in the three-phase AC power supply 1, the coil 18 is continuously excited.
When there is no abnormality in the three-phase AC power supply 1 and normal power is supplied to the power supply apparatus 100, the UPS 30 does not operate as a matter of course, and the same operation as that of the first embodiment described above is performed. Do. That is, at the start of activation of the power supply apparatus 100, the circuit breakers 10 of the plurality of first units 2 are sequentially turned on. In addition to the first embodiment, the power supply device 100 having such a configuration allows the operation of the power supply device 100 to be maintained by an instantaneous power failure of the three-phase AC power supply 1 and maintain the safety of the plant. There is an effect that the maintenance work becomes easier.

Embodiment 4 FIG.
In the fourth embodiment, a UPS 30 connected to the three-phase AC power source 1 is provided in the power supply device 100 in the same manner as the third embodiment, instead of the three-phase AC power source 1 of the second embodiment. It is.
As shown in FIG. 6, the power supply device 100 is provided with a UPS 30, a trip circuit breaker 6 connected thereto, a plurality of first units 2 a, and a startup sequence 5. Other than the UPS 30 is the same as that in FIG. Similarly, the circuit breakers 10 provided for each of the plurality of second units 12a are sequentially turned on.
The power supply device 100 according to the fourth embodiment performs the same operation as the second embodiment without operating the UPS 30 when the normal power from the three-phase AC power supply 1 is supplied. At the time of 1 instantaneous power failure, power is supplied from the UPS 30 and the coil 18 is continuously excited. In such a configuration of the fourth embodiment, in addition to the second embodiment, the excitation of the coil 18 is continued even when an instantaneous power failure of the three-phase AC power supply 1 occurs, and maintenance work at the periodic inspection is easier. There is an effect of becoming.

Embodiment 5 FIG.
FIG. 7 shows a power supply device 100 according to the fifth embodiment. In the first embodiment described above, the plurality of first units 2 shown in FIG. 1 have the same internal configuration, while in the fifth embodiment, the plurality of first units 2b-1 to 2b-3 are different. It classifies | categorizes according to the use of the reactor control rod drive coil of the load 19a-19c of FIG. 8 mentioned later.
Generally, a nuclear reactor control rod drive coil includes a plurality of fixed grip drive coils 18a for driving a fixed grip latch, a plurality of movable grip drive coils 18b for driving a movable grip latch, and a plurality of lifting / lowering drives. There are magnetic pole coils 18c-1, 18c-2, 18c-3 to be moved. The first unit 2b-1 is a fixed grip drive coil 18a, the first unit 2b-2 is a movable grip drive coil 18b, and the first unit 2b-3 is a lifting magnetic pole coil 18c-1, 18c-2, The drive control of 18c-3 is performed. In the fifth embodiment and the sixth embodiment described below, four fixed grip driving coils 18a, four movable grip driving coils 18b, and lifting magnetic pole coils 18c-1, 18c-2, 18c-3 are provided. There are three, and the inductances (L) they have are the same. The rest of the configuration is the same as in the first embodiment, and the circuit breaker 10 is also charged in the order of the first units 2b-1 to 2b-3 as in the first embodiment.
Next, the configuration of the first units 2b-1 to 2b-3 will be described in detail with reference to FIG.

  The first unit 2b-1 is provided with a plurality of second units 12b-1 via the circuit breaker 10 and the transformer 11. In the fifth embodiment, the two second units 12b-1 are provided in parallel, each having the same configuration, the rectifier 14 for converting the three-phase AC power source 1 into DC power, and the rectifier 14 Between the positive line 15 and the negative line 16 on the output side, a series circuit of a switching element S1 and a backflow prevention diode D2 constituting the voltage reversible chopper circuit 25, and a backflow prevention diode D1 and the switching element S2 are provided. A series circuit and an energy absorbing capacitor 17 are connected. The switching element S1 performs switching control of the excitation current of the fixed grip driving coil 18a, and the switching element S2 switches the stored energy release of the fixed grip driving coil 18a to the positive line 15 side when the excitation current is cut off. The energy absorbing capacitor 17 absorbs stored energy when the exciting current of the fixed grip driving coil 18a is cut off. Four fixed grip driving coils 18a are connected in parallel between a connection point between the switching element S1 and the backflow prevention diode D2 and a connection point between the backflow prevention diode D1 and the switching element S2.

  The second unit 12b-2 provided in parallel with each other has the same configuration as the second unit 12b-1 described above, the connection point between the switching element S1 and the backflow prevention diode D2, and the backflow prevention diode D1. And four movable gripping drive coils 18b are connected in parallel between the connection points of the switching element S2.

Similarly to the second units 12b-1 and 12b-2, the second unit 12b-3 includes a circuit breaker 10, a transformer 11, a rectifier 14, a positive electrode line 15, a negative electrode line 16, and an energy absorbing capacitor 17. In addition, a plurality of second units 12b-3 in the fifth embodiment are provided in parallel. The second unit 12b-3 includes, for example, each of the lifting / lowering magnetic poles in the voltage reversible chopper circuit 25 so that the three lifting / lowering magnetic pole coils 18c-1, 18c-2, and 18c-3 can be individually driven and controlled. Switching elements (S10 to S13) for the coils 18c-1 to 18c-3, backflow prevention diodes (D10 to D13), and a series circuit are provided. In the second unit 12b-3, each of the three switching elements S10, S11, and S12 controls the excitation current corresponding to each of the elevating magnetic pole coils 18c-1, 18c-2, and 18c-3. Since the circuit configuration is adopted, it can be formed of the same parts as the voltage reversible chopper circuit 25 of the fixed grip driving coil 18a and the movable grip driving coil 18b described above, and the application parts can be shared.
When starting up the power supply device 100, the circuit breaker 10 is sequentially turned on in the order of the first units 2b-1 to 2b-3 by the startup sequence 5 as in the first embodiment described above. There is an effect similar to that of the first mode. In this case, the first unit, for example, the two second units 12b-1 provided in 2b-1 are simultaneously inserted.

Embodiment 6 FIG.
FIG. 9 shows a power supply device 100 according to the sixth embodiment. In the fifth embodiment described above, the circuit breaker 10 and the transformer 11 are provided in the plurality of first units 2b-1 to 2b-3. However, as shown in FIG. Each of the plurality of first units 2c-1 to 2c-3 is provided with a transformer 11, and a second unit 12c-1 provided in the first units 2c-1 to 2c-3. The circuit breaker 10 is provided for each unit of ˜12c-3.
Further, the circuits after the rectifier 14 shown in the second units 12c-1 to 12c-3 have the same configuration as that of FIG. 8 of the fifth embodiment described above.
Furthermore, the correspondence between the first units 2c-1 to 2c-3 and the second units 12c-1 to 12c-3 is the same as that shown in FIG. 4 of the second embodiment.
That is, for example, the first unit 2a and the second unit 12a shown in FIG. 4 of the second embodiment are the same as the first unit 2c-1 and the second unit 12c− shown in FIG. 10 of the sixth embodiment. Corresponding to 1.
Then, the insertion of the circuit breaker 10 at the start of activation of the power supply device 100 according to the sixth embodiment is the same as in the second embodiment. That is, after all the circuit breakers 10 are opened, the circuit breakers 10 provided for each second unit are sequentially inserted, and the description thereof is omitted. Since such a configuration is adopted, there is an effect that the three-phase AC power source as the in-house power receiving facility can be reduced in size and the applied current control electronic component circuit can be shared.

Embodiment 7 FIG.
FIG. 11 shows a power supply apparatus 100 according to the seventh embodiment. In the seventh embodiment, a startup sequence 5a is provided in place of the startup sequence 5 shown in FIG. 7 shown in the fifth embodiment, and the others are the same as in FIGS. 7 and 8 of the fifth embodiment. Therefore, explanation is omitted.
The start-up sequence 5a of the seventh embodiment is a system in which the circuit breakers 10 provided in the first units 2b-1 to 2b-3 shown in FIG. However, in contrast to the fifth embodiment in which the turn-on order of the circuit breaker 10 is sequentially turned on, in the seventh embodiment, the turn-on order is considered with respect to the margin of the power supply current capacity.
As described above in the fifth embodiment, the first units 2b-1 to 2b-3 drive the coils 18a, 18b, 18c-1, 18c-2, and 18c-3 having different roles. 1 unit 2b-1 includes two second units 12b-1, 2b-2 includes two second units 12b-2, and the first unit 2b-3 includes second units. Four units 12b-3 are provided in parallel. The inductances (L) of the coils 18a, 18b, 18c-1, 18c-2, and 18c-3 are the same, and the capacities of the energy absorbing capacitors 17 of the second units 12b-1 to 12b-3 are the same. Therefore, when viewed from the power source side, when the circuit breaker 10 of the first unit 2b-3 is turned on, the initial charging current of the energy absorbing capacitor 17 is changed to the other first unit 2b-1, Larger than that of 2b-2.

Here, in general, in a circuit having a plurality of parallel numbers as shown in FIG. 8 described above, when a circuit breaker is turned on, a steady current is supplied from the power source to the turned on circuit. Therefore, the larger the number of circuit breakers that are turned on, the larger the steady current supplied from the power supply. Further, in addition to the steady current flowing in the circuit when the breaker is turned on, a transient current caused by turning on the breaker (that is, in the case of all the embodiments according to the present invention, it corresponds to the initial charging current to the energy absorbing capacitor 17). Flows.
Therefore, when viewed from the power source side, when the circuit breaker is turned on, the circuit with a large transient current in a state where the steady current is small first has a margin for the power supply current capacity.

Therefore, the activation sequence 5a according to the seventh embodiment includes the circuit breaker 10 provided in the first unit 2b-3 in which the initial charging current of the energy absorbing capacitor 17 that is a transient current is large when the power supply device 100 is activated. Is first input, and then the first unit 2b-2 is sequentially input following the first unit 2b-1.
Since the circuit breakers 10 are sequentially turned on in accordance with such a command from the start-up sequence 5a, there is room for the power supply current capacity of the three-phase AC power supply 1, and accordingly, the three-phase AC power supply 1 is reduced in size and capacity. Is possible.
Since the units 2b-1 and 2b-2 have the same initial charging current, the order in which the circuit breakers 10 are turned on may be reversed.

Embodiment 8 FIG.
FIG. 12 shows a power supply apparatus 100 according to the eighth embodiment. In the eighth embodiment, a startup sequence 5a is provided in place of the startup sequence 5 shown in FIG. 9 shown in the sixth embodiment, and the others are the same as those in the sixth embodiment, so that the description thereof is omitted. .
The start-up sequence 5a of the eighth embodiment is a selection sequence of the circuit breakers 10 provided in the first units 2c-1 to 2c-3 in consideration of the margin of power supply current capacity, The order of input is the same as that of the seventh embodiment described above, and a circuit with a large transient current is input first with a small steady current. The power supply device 100 having such a configuration is advantageous in that the three-phase AC power source 1 can be reduced in size and capacity, and the electronic component circuit can be shared.

Embodiment 9 FIG.
In the first to eighth embodiments, the power supply device 100 that excites the drive coil of the reactor control rod has been described. However, the power supply device 100 may be used as the reactor control rod control device 100. This nuclear reactor control rod control device 100 performs a start-up command for a start-up sequence 5 in response to a command from a control unit for plant control (not shown in FIG. 1), for example. By using the reactor control rod control device 100 having the configuration of the device, the above-described effects can be obtained.

1 Three-phase AC power supply,
2, 2a, 2b-1 to 2b-3, 2c-1 to 2c-3 first unit,
12, 12a, 12b-1 to 12b-3, 12c-1 to 12c-3 second unit,
5,5a Start-up sequence, 14 rectifier, 15 positive line, 16 negative line,
17 capacitor for energy absorption, 18, 18a-18c coil,
19, 19a-19c load, 20 current control circuit, 30 uninterruptible power supply,
100 Power supply (reactor control rod control device).

Claims (8)

A power supply device for supplying DC power to a load,
The power supply device is provided with a first unit arranged in parallel and connected to a three-phase AC power supply, and a startup sequence for controlling the first unit,
The first unit is provided with a second unit arranged in parallel and connected to a load for each unit via a circuit breaker that opens and closes an output from the three-phase AC power source. The unit includes a rectifier that rectifies the output of the three-phase AC power source, and an energy that is connected to the positive line and the negative line on the output side of the rectifier and absorbs the energy accumulated in the load when the excitation current to the load is cut off. An absorption capacitor and a current control circuit that is connected to the energy absorption capacitor and controls the excitation current to the load are provided. In the start-up sequence, the load is connected to the energy absorption capacitor at the start of excitation. A power supply apparatus comprising: a sequence for controlling the first unit so that a flowing transient current becomes a predetermined value or less. A power supply device for supplying DC power to a load,
The power supply device is provided with a first unit arranged in parallel and connected to a three-phase AC power supply, and a startup sequence for controlling the first unit,
The first unit is provided with a second unit that is arranged in parallel and connected to a load for each unit, and the second unit is configured to shut off an output from the three-phase AC power source. , A rectifier that rectifies the output of the three-phase AC power supply, and an energy that is connected to the positive line and the negative line on the output side of the rectifier and absorbs the energy accumulated in the load when the excitation current to the load is interrupted An absorption capacitor and a current control circuit that is connected to the energy absorption capacitor and controls the excitation current to the load are provided. In the start-up sequence, the load is connected to the energy absorption capacitor at the start of excitation. A power supply apparatus comprising: a sequence for controlling the first unit so that a flowing transient current becomes a predetermined value or less. 2. The sequence provided in the start-up sequence is characterized in that the circuit breakers provided in the first unit are sequentially inserted in the order of parallel arrangement of the first units. The power supply device described in 1. 3. The sequence provided in the start-up sequence is characterized in that the circuit breakers provided in the second unit are sequentially inserted in the order of parallel arrangement of the second units. The power supply device described in 1. The sequence provided in the start-up sequence is a sequence in which the circuit breakers provided in the first unit are placed in order of increasing transient current flowing in the energy absorbing capacitor. The power supply device according to 1. The sequence provided in the start-up sequence is a sequence in which the circuit breakers provided in the second unit are turned on in order of increasing transient current flowing in the energy absorbing capacitor. 2. The power supply device according to 2. The power supply device is provided with an uninterruptible power supply device between the three-phase AC power supply and the first unit,
3. The power supply device according to claim 1, wherein when an instantaneous power failure occurs in the three-phase AC power supply, the power output from the uninterruptible power supply device is supplied to a load. A reactor control rod control device using the power supply device according to any one of claims 1 to 7, wherein the load is a reactor control rod drive coil, and the power supply device A reactor control rod control device using a power supply device, wherein a reactor control rod drive coil is excited and the reactor control rod is driven to a predetermined position.

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