JP7118915B2 - Emergency power supply equipment for nuclear power plant, its control method, and control device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an emergency power supply facility for a nuclear power plant, its control method, and a control device.

An emergency on-site power supply system of a nuclear power plant supplies stable power to an emergency core cooling system (ECCS) and the like, and is a highly important power supply facility necessary for maintaining the safety of a nuclear reactor.

JP-A-4-008124

2. Description of the Related Art In recent years, when a single-phase open-phase occurs in a power supply system, it is required to detect it and isolate the faulty part to maintain a stable power supply.

On the other hand, if a single-phase open-phase detection device is introduced into the emergency on-site power supply system and this detection device is added to the interlock that isolates the external power supply system and starts the emergency diesel generator, an error in the detection device will be prevented. It is desirable to be able to suppress unnecessary emergency diesel generator startup due to detection or malfunction. If the detection signal of the open-phase failure detection device is used as it is for the start interlock of the emergency diesel generator, unnecessary emergency diesel start will be caused even though the external power supply system has a healthy system. In addition, an erroneous detection or malfunction of the open-phase failure detection device, or a single failure may cause the start of the emergency diesel generator.

In order to achieve the above object, an emergency power supply facility for a nuclear power plant according to an embodiment of the present invention includes a first power receiving transformer that receives power from an external power supply, and is connected to the external power supply via the first power receiving transformer. a first emergency bus including a power receiving circuit breaker capable of interrupting connection with the external power supply; and a first emergency diesel generator that supplies power to the first emergency bus when the external power supply is interrupted. An emergency power supply system, a second power receiving transformer that receives power from an external power supply, and a power receiving circuit breaker that is connected to the external power supply via the second power receiving transformer and capable of interrupting connection with the external power supply. and a second emergency diesel generator that supplies power to the second emergency bus when the external power is cut off; and the primary side of the first power receiving transformer. A first open-phase failure detection device for detecting open-phase of the phase AC power supply, and a second open-phase failure detection device for detecting open-phase of the three-phase AC power supply on the primary side of the second power receiving transformer. When only one of the first open-phase failure detection device and the second open-phase failure detection device detects an open-phase of the three-phase AC power supply on the primary side, the first The emergency diesel generator and the second emergency diesel generator do not start, and both the first open-phase failure detection device and the second open-phase failure detection device detect the open-phase of the three-phase AC power supply on the primary side. In this case, the power receiving circuit breaker of the first emergency bus and the power receiving circuit breaker of the second emergency bus operate to cut off the power from the external power supply, and the first emergency diesel generator and It is configured to start at least one of the second emergency diesel generators.

Further, a method for controlling an emergency power supply facility for a nuclear power plant according to an embodiment of the present invention includes a power receiving transformer that receives power from an external power supply, an emergency bus including a power receiving circuit breaker, and an emergency bus when the external power is cut off. A nuclear power plant emergency power plant having a plurality of emergency power supply systems consisting of emergency diesel generators that feed power to a nuclear power plant, and an open-phase fault detection means for detecting an open-phase failure of the three-phase AC power supply on the primary side of each of the power receiving transformers. A control method for a power supply facility for a commercial power supply, wherein the open-phase fault detection means
When an open phase is detected in a part of the emergency power supply systems among the plurality of emergency power supply systems, the emergency diesel generator is not started, and the open phase fault detection means detects a plurality of the emergency power supply systems. When an open phase is detected in all the emergency power supply systems of the system, the emergency diesel generator is started.

Further, the control device for emergency power supply equipment of a nuclear power plant according to the embodiment of the present invention includes a power receiving transformer that receives power from an external power supply, an emergency bus including a power receiving circuit breaker, and power supply to the emergency bus when the external power is cut off. emergency power supply system for a nuclear power plant comprising a plurality of emergency power supply systems consisting of emergency diesel generators, and an open-phase failure detection means for detecting an open-phase failure of the three-phase AC power supply on the primary side of each of the power receiving transformers. A control device for equipment, which receives an open-phase detection signal from the open-phase failure detection means, and the open-phase failure detection means detects a failure in a part of the emergency power supply systems among the plurality of emergency power supply systems. When the phase is detected, the operation signal of the power receiving circuit breaker and the start signal of the emergency diesel generator are not transmitted, and the open phase fault detection means detects all the emergency power supply systems of the plurality of emergency power supply systems. When an open phase is detected in the power supply system, an operation signal is transmitted to the power receiving circuit breaker so as to isolate the emergency bus from the power receiving transformer, and a start signal is transmitted to the emergency diesel generator. It is.

According to the embodiment of the present invention, when a single-phase open-phase detection device is introduced into an emergency on-site power supply system, an emergency power generator that can suppress unnecessary emergency diesel generator activation due to false detection or malfunction of the detection device. Power supply facilities can be provided.

1 is a circuit diagram for explaining the configuration of an emergency power supply facility 101 according to Embodiment 1. FIG. 4 is a configuration diagram of an interlock for the emergency power supply equipment 101 according to the first embodiment; FIG. The circuit diagram explaining the structure of 101 A of emergency power supply equipment by Example 2. FIG. The block diagram of the interlock concerning 101 A of emergency power supply equipment by Example 2. FIG.

Embodiments of the present invention will be described below with reference to the drawings.

(Example 1)
An emergency power supply facility 101 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. The emergency power supply facility 101 is configured by having a plurality of emergency power supply systems.

FIG. 1 is a circuit diagram showing the configuration of an emergency power system installed in a nuclear power plant. Two emergency power supply systems are shown, each of which has the same configuration. There may be three or more emergency power supply systems.

The emergency power supply systems 100A and 100B respectively receive power from an external power supply (not shown) via power receiving transformers 1A and 1B and power receiving transformers 1A and 1B from the external power supply to operate during a plant accident. emergency busbars 2A, 2B that supply electric power to equipment, etc.; Diesel generators 4A, 4B for supplying power to the emergency buses 2A, 2B in an emergency when 2B cannot receive power supply from an external power supply, and circuit breakers provided between the emergency diesel generators and the emergency buses 2A, 2B. (Power receiving circuit breakers) 5A and 5B, and open-phase failure detectors 6A and 6B installed on the primary sides of the power receiving transformers 1A and 1B, respectively.

In normal times, that is, when power is supplied from the external power supply to the emergency buses 2A and 2B, the circuit breakers 3A and 3B are electrically connected to the "on" state, and the circuit breakers 5A and 5B are electrically disconnected. It is in the "off" state.

A central control room (not shown) of a nuclear power plant is provided with a function of issuing an alarm when the open-phase failure detectors 6A and 6B detect an open-phase. Below, emergency power system 100A
, 100B or any one of the emergency power supply systems 100A and 100B, the term "emergency power supply system 100" may be used without A and B. The same applies to other configurations.

The operation of the emergency power supply equipment 101 when an open-phase failure is detected will be described with reference to FIG. 2 . Figure 2
2 is a configuration diagram of an interlock related to the emergency power supply equipment 101. FIG.

The conditions for turning ON when the open-phase failure detection devices 6A and 6B detect open-phase are respectively "the open-phase failure detection device 6A detects open-phase" 9A and "the open-phase failure detection device 6B detects open-phase". 9B,
"Open phase failure detection device 6A alarm" 10A, "Open phase failure detection device 6B alarm" 10A and "Open phase failure detection device 6B alarm "Notify" 10B. In addition, 11 is the AND of conditions 9A and 9B, 12A is the function of tripping the circuit breaker (putting the circuit breaker in the "OFF" state) when ON is input,
"Breaker 3B off" 12B.

First, the operation when an open phase occurs only in the emergency power supply system 100A and the open phase failure detection device 6A detects the open phase will be described.

The output signal of "open-phase failure detection device 6A detects open-phase" 9A is input to "open-phase failure detection device 6A alarm activation" 10A, and an alarm is displayed on the panel of open-phase failure detection device 6A and the central control room. conduct. On the other hand, since "open phase failure detection device 6B detects open phase" 9B is not output, "open phase failure detection device 6B alarm generation" 10B does not operate. Further, the symbol 11, which ANDs 9A and 9B, does not operate because the "open phase failure detection device 6B detects open phase" 9B is not output, and the circuit breakers 3A and 3B remain "on".

Here, when an open phase occurs only in the emergency power supply system 100B, the operation is performed by replacing A and B in the above description.

Next, all the external power supply systems, that is, the emergency power supply systems 100A and 100 in this embodiment
A description will be given of the operation when phase loss occurs in both of B and the phase loss detection devices 6A and 6B detect the phase loss.

The output signal of "open-phase failure detection device 6A detects open-phase" 9A is input to "open-phase failure detection device 6A alarm activation" 10A, and an alarm is displayed on the panel of open-phase failure detection device 6A and the central control room. conduct. Similarly, the output signal of "open-phase failure detection device 6B detects open-phase" 9B is input to "open-phase failure detection device 6B alarm" 10B, and is sent to the panel of open-phase failure detection device 6B and the central control room. Display an alarm. Further, the symbol 11 obtained by ANDing 9A and 9B is turned ON, and the "breaker 3A off" 12A and "breaker 3B off" 12B operate. When the circuit breakers 3A and 3B trip, the interlock of the on-site power supply system automatically activates the emergency diesel generators 4A and 4B.
is activated, the circuit breakers 5A and 5B are turned on, and the external power supply system is isolated.

Here, when three or more emergency power supply systems are provided, the code 11 is configured to turn ON when an open phase is detected in all the emergency power supply systems.

In addition, all the emergency diesel generators 4 are basically started, but the control to start only some of them is not excluded.

In the emergency power supply system 101 of the present embodiment described above, in a state in which some of the multiple emergency power supply systems 100 are out of phase, the power required to maintain the safety of the nuclear reactor is Since it can be supplied by the rest of the sound system, it will be limited to the warning. Then, the emergency diesel generator is activated only when all the external power supply systems are in an open-phase state. With such a configuration, it is possible to suppress unnecessary activation of the emergency diesel generator 4 when a healthy system exists without impairing the reliability of power supply to the emergency bus 2 .

In addition, even if a single failure or malfunction occurs in some of the plurality of open-phase failure detection devices 6 during normal times and an open-phase detection signal is output, the power station It is possible to mitigate the impact on

(Example 2)
101 A of emergency power supply facilities which concern on Example 2 of this invention are demonstrated using FIG.3, FIG.4, FIG.5, FIG.6. In addition, the same code|symbol is attached|subjected to the structure same as Example 1, and the overlapping description is abbreviate|omitted. The emergency power supply facility 101A is configured by having a plurality of emergency power supply systems.

FIG. 3 is a circuit diagram showing the configuration of an emergency power system installed in a nuclear power plant. Two emergency power supply systems are shown, each of which has the same configuration. There may be three or more emergency power supply systems.

In this embodiment, a busbar connecting electric line 7 connecting the emergency busbars 2A and 2B, and circuit breakers (busbar connecting circuit breakers) 8A and 8B provided in the busbar connecting electric line 7 are further provided. On the busbar connection electric line 7, the circuit breaker 8A is provided on the emergency busbar 2A side, and the circuit breaker 8B is provided on the emergency busbar 2B side. By providing this busbar connection electric line 7, the emergency busbars 2A and 2B
are not only supplied with power via the power receiving transformers 1A and 1B of the respective emergency power supply systems 100A and 100B, but also can receive power from the other emergency power supply system 100 via the busbar connection line 7. . For example, when the circuit breaker 3B is in the "OFF" state, it is possible to feed power from the external power supply to both the emergency buses 2A and 2B via the power receiving transformer 1A.

The circuit breakers 8A, 8B are connected to the emergency power supply systems 100A, B respectively by the emergency buses 2A, 2B.
When power is received from the power receiving transformers 1A and 1B, at least one of them is turned off. When power is supplied from one side of the emergency bus 2 to the other via the bus line connection electric line 7, the circuit breaker 8A
, 8B are both turned on.

The operation of the emergency power supply equipment 101A when an open-phase failure is detected will be described with reference to FIG. FIG. 4 is a configuration diagram of an interlock related to the emergency power supply equipment 101A.

In FIG. 4, the condition "circuit breaker 3A OFF" 13A that turns ON when the circuit breaker 3A is OFF, the condition "circuit breaker 3B OFF" 13B that turns ON when the circuit breaker 3B is OFF, and the circuit breaker 8A Condition "circuit breaker 8A OFF" 14A that turns ON when the circuit breaker 8A is OFF, ON when the circuit breaker 8B is OFF
It has a condition "circuit breaker 8B off" 14B.

Code 15 is the OR of code 9A and code 9B. When "breaker 3A off" 13A and "circuit breaker 3B off" 13B are ON respectively, code 9A and code 9B are wiped out (WO). The input to code 15 becomes OFF. That is, the code 15 is O when the circuit breaker 3 is in the "on" state and an open phase is detected in at least one of the emergency power supply systems 100.
becomes N.

Code 16 is the OR of codes 14A and 14B, and NOT of codes 15 and 16 (code 20)
17, and 18 is the AND of 16 and 9A and 9B. Code 19 is the OR of code 17 and code 18 . The function to trip the breaker 3A when ON is input is "breaker 3A OFF" 21, the function to trip the breaker 3B is "breaker 3B OFF" 22, and similarly, the breaker when ON is input. The function to trip 8A is set to "breaker 8A off" 23,
The function of tripping the circuit breaker 8B is referred to as "breaker 8B off" 24.

In the following, the power supply to the emergency buses 2A and 2B is divided into the case where the power is supplied from the power receiving transformers 1A and 1B of each system and the case where the power is supplied from one of the power receiving transformers 1 using the bus line connecting line 7. explain.
(Power is supplied from power receiving transformers 1A and 1B to emergency buses 2A and 2B)

When power is supplied from the power receiving transformers 1A and 1B to the emergency buses 2A and 2B, the circuit breaker 8 is normally used.
Either A or 8B is in the "off" state. Therefore, the code 16 is always ON. Since OFF (NOT of ON of code 16) is input to code 17 from code 20, code 17 is always OFF. As for the code 18, since the input from the code 16 is always ON, the code 18 is also turned ON when ON is also input from the codes 9A and 9B.

That is, only when an open phase is detected by both of the open phase failure detection devices 6A and 6B
8 is turned ON, and code 19 is also turned ON. Then, the circuit breakers 3A and B are turned off,
If one of the circuit breakers 8A, 8B was in the "on" state, it will also be in the "off" state. Then, the emergency diesel generators 4A and 4B are automatically activated by the interlock of the on-site power supply system, the circuit breakers 5A and 5B are turned on, and the external power supply system is isolated.
(Power is supplied to both emergency bus 2A and 2B from power receiving transformer 1A)

When power is supplied to both the emergency bus 2A and 2B from the power receiving transformer 1A, normally the circuit breaker 3
A, 8A and 8B are in the "on" state, and circuit breaker 3B is in the "off" state.

When the open-phase failure detection device 6B detects an open-phase, the circuit breaker 3B is "OFF", so the input to the reference numeral 15 is OFF. That is, the code 15 is turned ON only when the open-phase failure detection device 6A detects an open-phase and ON is input from the code 9A.

Since the circuit breakers 8A and 8B are in the "on" state, reference numeral 16 is OFF. ON is input to the code 20 to the code 17 . On the other hand, code 18 does not turn ON because OFF is input from code 16 .

From the above, when the open-phase failure detection device 6A detects an open-phase, the codes 17 and 19 are turned ON, and the circuit breaker 3A and the circuit breakers 8A and 8B are turned off. Then, the emergency diesel generators 4A and 4B are automatically activated by the interlock of the on-site power supply system, and the circuit breakers 5A and 5
B is turned on, and the external power supply system is isolated. On the other hand, it is not affected by the open-phase detection by the open-phase failure detection device 6B.

When power is supplied from the power receiving transformer 1B to both the emergency buses 2A and 2B, the operation is performed by replacing A and B of the circuit breaker 3 and the open phase fault detection device 6 in the above description.

In the emergency power supply facility 101A of the present embodiment described above, when the power supply function from the external power supply to the emergency bus 2 is lost due to an open phase, the diesel generator 4 is reliably started, while the external power supply The diesel generator 4 is not started by an open-phase detection (single failure, malfunction, etc.) signal from the open-phase failure detection device 6 that does not affect the power supply to the emergency bus 2 from the power supply. With such a configuration, it is possible to suppress unnecessary activation of the emergency diesel generator 4 when a healthy system exists without impairing the reliability of power supply to the emergency bus 2 .

Here, when three or more emergency power supply systems 100 are provided, when power is supplied to each of the emergency buses 2 from the power receiving transformer 1 of each system, all the open-phase failure detection devices 6 detect open-phase. case, the external power supply system is isolated and the emergency diesel generator 4 is activated. again,
When power is supplied from any of the power receiving transformers 1 to a plurality of emergency buses 2, the presence or absence of open-phase detection by the open-phase failure detection device 6 of the emergency power supply system 100 receiving power through the bus-connecting line 7 is not affected by the external The power supply system is isolated and the emergency diesel generator 4 is activated. For example, when power is supplied from the power receiving transformer 1A to the emergency buses 2A, 2B, and 2C, isolation of the external power supply system and activation of the diesel generator are performed only when the phase failure detection device 6A detects the phase failure. When power is supplied from the power receiving transformer 1A to the emergency bus 2A and from the power receiving transformer 1B to the emergency buses 2B and 2C, the external Isolate the power supply system and start the diesel generator.

Several embodiments of the present invention have been described above. The above-mentioned function is installed in, for example, a nuclear power plant, receives various signals of the nuclear power plant including the detection signal of each open-phase fault detection device, and transmits an operation signal to each circuit breaker and each diesel generator. It is realized by implementing it as an interlock in (control device).

Also, these embodiments are provided as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

101... emergency power supply facility, 100A, 100B... emergency power supply system, 1A, 1B... power receiving transformer, 2A, 2B... emergency bus, 3A, 3B, 5A, 5B, 8A, 8B... circuit breaker, 4A, 4
B... Diesel generator, 6A, 6B... Open-phase fault detector, 7... Bus-bar connection electric circuit

Claims (4)

a first power receiving transformer that receives power from an external power source ;
A first emergency bus connected to the external power supply via the first power receiving transformer and including a power receiving circuit breaker capable of interrupting connection with the external power supply;
a first emergency power supply system having a first emergency diesel generator that supplies power to the first emergency bus when an external power source is cut off;
a second power receiving transformer that receives power from an external power source ;
a second emergency bus connected to the external power supply via the second power receiving transformer and including a power receiving circuit breaker capable of interrupting connection with the external power supply;
a second emergency power supply system having a second emergency diesel generator that supplies power to the second emergency bus when the external power source is cut off;
a first open-phase failure detection device for detecting an open-phase of the three-phase AC power supply on the primary side of the first power receiving transformer;
a second open-phase fault detection device for detecting an open-phase of the three-phase AC power supply on the primary side of the second power receiving transformer;
An emergency power supply facility for a nuclear power plant comprising
When only one of the first open-phase failure detection device and the second open-phase failure detection device detects the open-phase of the three-phase AC power supply on the primary side, the first emergency diesel generator and the second emergency diesel generator the machine does not start,
When both the first open-phase failure detection device and the second open-phase failure detection device detect the open-phase of the three-phase AC power supply on the primary side, the power receiving circuit breaker of the first emergency bus and the second A power receiving circuit breaker of the emergency bus is activated to cut off power from the external power supply, and to start at least one of the first emergency diesel generator and the second emergency diesel generator. Also, emergency power supply facilities for nuclear power plants. a first power receiving transformer that receives power from an external power source ;
A first emergency bus connected to the external power supply via the first power receiving transformer and including a power receiving circuit breaker capable of interrupting connection with the external power supply;
a first emergency power supply system having a first emergency diesel generator that supplies power to the first emergency bus when an external power source is cut off;
a second power receiving transformer that receives power from an external power source ;
a second emergency bus connected to the external power supply via the second power receiving transformer and including a power receiving circuit breaker capable of interrupting connection with the external power supply;
a second emergency power supply system having a second emergency diesel generator that supplies power to the second emergency bus when the external power source is cut off;
a first open-phase failure detection device for detecting an open-phase of the three-phase AC power supply on the primary side of the first power receiving transformer;
a second open-phase fault detection device for detecting an open-phase of the three-phase AC power supply on the primary side of the second power receiving transformer;
a busbar connection electric circuit that connects the first emergency busbar and the second emergency busbar;
A busbar connection circuit breaker provided on the busbar connection electric circuit,
An emergency power supply facility for a nuclear power plant configured to be able to supply power from the first power receiving transformer to the second emergency bus via the first emergency bus and the bus connecting electric line,
When power is supplied from the first power receiving transformer to the second emergency bus, when the second open-phase failure detection device detects an open-phase, the first emergency diesel generator and the second emergency the diesel generator does not start, and
Emergency use of a nuclear power plant configured to start at least one of a first emergency diesel generator and a second emergency diesel generator when the first open phase fault detection device detects an open phase Power equipment. A plurality of emergency power supply systems comprising a power receiving transformer for receiving power from an external power supply, an emergency busbar including a power receiving circuit breaker, and an emergency diesel generator for supplying power to the emergency busbar when the external power supply is cut off, A control method for an emergency power supply facility of a nuclear power plant having an open-phase failure detection means for detecting an open-phase failure of a three-phase AC power supply on the primary side of each transformer, comprising:
When the open-phase failure detection means detects an open-phase in a part of the emergency power supply system among the plurality of emergency power supply systems, the emergency diesel generator is not started,
of the emergency power supply equipment of a nuclear power plant, wherein the open-phase failure detection means starts the emergency diesel generator when detecting an open-phase in all the emergency power supply systems of the plurality of emergency power supply systems. control method. A plurality of emergency power supply systems consisting of a receiving transformer that receives power from an external power supply, an emergency bus including a receiving circuit breaker, and an emergency diesel generator that supplies power to the emergency bus when the external power supply is cut off; A control device for an emergency power supply facility of a nuclear power plant, comprising an open-phase fault detection means for detecting an open-phase failure of a three-phase AC power supply on the primary side, respectively,
receiving an open-phase detection signal from the open-phase fault detection means;
When the open-phase failure detection means detects an open-phase in a part of the emergency power supply systems among the plurality of emergency power supply systems, an operation signal for the power receiving circuit breaker and activation of the emergency diesel generator send no signal,
When the open-phase fault detection means detects an open-phase in all the emergency power supply systems of the plurality of emergency power supply systems, the power reception is cut off so as to isolate the emergency bus from the power reception transformer. A control device for an emergency power supply facility of a nuclear power plant, which transmits an operation signal to an emergency diesel generator and a start signal to the emergency diesel generator.

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