Nuclear power station UPS forced switching control panel

Abstract

The utility model discloses a nuclear power station UPS forced switching control panel, which relates to the technical field of nuclear power station UPS control, and comprises a main power supply module used for electric energy processing and main power supply; the standby power supply module is used for standby power supply; the switch control module is used for electric energy transmission control and electric energy switching control and supplying power to a nuclear power station load connected with the nuclear power station load module; the electric energy detection processing module is used for electric energy processing and power failure detection; the forced switching module is used for controlling forced self-locking of the self-locking control module; the self-locking control module is used for signal self-locking and self-locking reset work; and the delay protection module is used for regularly controlling the self-locking control module to stop resetting work. The nuclear power station UPS forced switching control panel of the utility model can automatically carry out power supply switching work and forced power supply switching work, satisfies power supply to a load module of a nuclear power station, and stops power supply switching again in a short time after power supply switching, thereby improving power supply switching safety.

Description

Technical Field

[0001] The utility model relates to the technical field of UPS control for nuclear power plants, in particular to a UPS forced switching control panel for nuclear power plants. Background Art

[0002] Under normal circumstances, a nuclear power plant uses the main power supply (i.e., the normal power supply) to output power. In an emergency situation, that is, when the main power supply loses power, a backup power supply is needed to replace the main power supply output to supply power to important downstream loads. The UPS switching control board of a nuclear power plant in the prior art generally automatically controls the backup power supply to supply power to the downstream loads of the nuclear power plant when the main power supply loses power, or manually performs forced power switching and controls the main power supply to be re-powered by manual control. However, within a period of time after the power switching, there is a risk of falsely triggering the main power supply to be re-powered, which will then lead to a short period of repeated power switching in the nuclear power plant, and in severe cases, cause power supply failure to the downstream loads of the nuclear power plant, so it needs to be improved. Utility Model Content

[0003] The embodiment of the present utility model provides a nuclear power plant UPS forced switching control board to solve the problems raised in the above background technology.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A nuclear power plant UPS forced switching control panel, comprising: a main power module, a backup power module, a switch control module, a nuclear power plant load module, an electric energy detection and processing module, a self-locking control module, a forced switching module and a delay protection module;

[0006] The main power module is used to receive and transmit three-phase AC power and perform voltage reduction processing on the three-phase AC power;

[0007] A backup power module is used to provide backup power;

[0008] a switch control module connected to the main power module, the backup power module, the self-locking control module, the nuclear power plant load module, and the power detection and processing module, and configured to transmit the power output by the main power module to the nuclear power plant load module and the power detection and processing module, and upon receiving a switching signal output by the self-locking control module, stop transmitting power to the main power module and transmit the backup power to the nuclear power plant load module and the power detection and processing module;

[0009] A nuclear power plant load module, configured to receive electrical energy transmitted by the switch control module and supply power to the connected nuclear power plant loads;

[0010] An electric energy detection and processing module is used to perform voltage reduction, rectification and filtering processing on the electric energy transmitted by the switch control module and output DC electric energy, detect the power supply status of the switch control module, and generate a first level signal when the switch control module is not transmitting electric energy;

[0011] a forced switching module, connected to the power detection and processing module, configured to receive DC power and provide a second level signal;

[0012] a self-locking control module connected to the power detection and processing module, the forced switching module, and the delay protection module, configured to receive DC power and, upon receiving a first level signal or a second level signal, perform self-locking and output a switching signal, provide a reset signal, and perform self-locking and resetting, and stop the self-locking and resetting operation upon receiving a delay control signal output by the delay protection module;

[0013] The delay protection module is connected to the power detection processing module and the forced switching module, and is used to receive DC power and set the timing time. When receiving the second level signal or the switching signal, it starts the timing work and outputs the delay control signal at a regular time.

[0014] As a further solution of the present invention: the main power module includes a three-phase power interface, a high-voltage load switch device and a dry-type transformer; the backup power module includes a generator device; the switch control module includes a first low-voltage switch and a second low-voltage switch; the nuclear power plant load module includes a nuclear power plant load interface;

[0015] Preferably, the first end, the second end and the third end of the three-phase power supply interface are respectively connected to the first end, the second end and the third end of the high-voltage load switch device, the fourth end, the fifth end and the sixth end of the high-voltage load switch device are respectively connected to the first end, the second end and the third end of the dry-type transformer, the fourth end, the fifth end and the sixth end of the dry-type transformer are respectively connected to the first moving end, the second moving end and the third moving end of the first low-voltage switch, the first end, the second end and the third end of the generator device are respectively connected to the first moving end, the second moving end and the third moving end of the second low-voltage switch, the first static end of the first low-voltage switch is connected to the first static end of the second low-voltage switch and the first end of the nuclear power plant load interface, the second static end of the second low-voltage switch is connected to the second static end of the second low-voltage switch and the second end of the nuclear power plant load interface, and the third static end of the second low-voltage switch is connected to the third static end of the second low-voltage switch and the third end of the nuclear power plant load interface.

[0016] As a further solution of the present invention: the power detection and processing module includes a power processing device, a first resistor, a second resistor, a first diode, a first capacitor, a third resistor and a first switch tube;

[0017] Preferably, the first end, the second end and the third end of the power processing device are respectively connected to the first static end, the second static end and the third static end of the first low-voltage switch, the fourth end of the power processing device is connected to the anode of the first diode and the base of the first switching tube through the first resistor, the cathode of the first diode is connected to one end of the first capacitor and the collector of the first switching tube and the self-locking control module through the third resistor, and the fifth end of the power processing device, the other end of the second resistor, the other end of the first capacitor and the emitter of the first switching tube are all grounded.

[0018] As a further solution of the utility model: the self-locking control module includes a second diode, a third diode, a fourth diode, a first logic chip, a fourth resistor, a second switch tube, a third switch tube, a fifth resistor, and a first key switch;

[0019] Preferably, the anode of the second diode is connected to the collector of the first switching tube, the cathode of the second diode is connected to the anode of the third diode and the cathode of the fourth diode, the cathode of the third diode is connected to the A end of the first logic chip, the B end of the first logic chip is connected to the collector of the second switching tube and is connected to the cathode of the first diode and one end of the fifth resistor through the fourth resistor, the emitter of the second switching tube and the emitter of the third switching tube are both grounded, the base of the second switching tube is connected to the collector of the third switching tube and one end of the first push switch, the other end of the first push switch is connected to the other end of the fifth resistor, the base of the third switching tube is connected to the delay protection module, and the F end of the first logic chip is connected to the anode of the fourth diode.

[0020] As a further solution of the present invention: the switch control module further includes a first circuit breaker and a fifth switch tube;

[0021] Preferably, the base of the fifth switch is connected to the F terminal of the first logic chip, the emitter of the fifth switch tube is grounded, the collector of the fifth switch tube is connected to one end of the first circuit breaker, and the other end of the first circuit breaker is connected to the cathode of the first diode.

[0022] As a further solution of the present invention: the forced switching module includes a seventh resistor, a second key switch, a fifth diode, a fourth switch tube and a sixth resistor;

[0023] Preferably, the first end of the second push-button switch is connected to the collector of the fourth switch tube and the cathode of the first diode through the seventh resistor, the second end of the second push-button switch is connected to the base of the fourth switch tube and the delay protection module, the emitter of the fourth switch tube is connected to the anode of the fifth diode and grounded through the sixth resistor, and the cathode of the fifth diode is connected to the cathode of the second diode.

[0024] As a further solution of the present invention: the delay protection module includes an eighth resistor, a first timer, a ninth resistor, a second capacitor, a third capacitor, a sixth switch tube, a sixth diode and a seventh diode;

[0025] Preferably, the fourth end and the eighth end of the first timer are connected to one end of the ninth resistor and the cathode of the first diode and are connected to the second end of the first timer and the collector of the sixth switch tube through the eighth resistor. The other end of the ninth resistor is connected to the seventh end and the sixth end of the first timer and is grounded through the second capacitor. The fifth end of the first timer is grounded through the third capacitor. The emitter of the sixth switch tube and the first end of the first driver are both grounded. The base of the sixth switch tube is connected to the cathode of the sixth diode and the cathode of the fifth diode. The anode of the sixth diode is connected to the second end of the second push switch, and the anode of the seventh diode is connected to the F end of the first logic chip.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: the nuclear power plant UPS forced switching control board of the present invention uses the main power supply module to perform the main power supply work, and the backup power supply module to perform the backup power supply. When the power detection and processing module performs power processing and determines that the main power supply cannot be supplied or the forced switching module performs forced switching work, the self-locking control module will control the switch control module to perform power switching work to meet the power supply needs of the nuclear power plant load module, and after the power switching, the delay protection module will timer control the reset work of the self-locking control module to avoid the self-locking control module from switching the power again in a short time due to accidental touching of the key switch, thereby improving the safety of power switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The present invention provides a schematic block diagram of a forced switching control panel for a UPS in a nuclear power plant.

[0029] Figure 2 The present invention provides a circuit diagram of a forced switching control board for a UPS in a nuclear power plant.

[0030] Figure 3 This is a connection circuit diagram of the delay protection module provided by an example of the utility model. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In one embodiment, see Figure 1 A nuclear power plant UPS forced switching control panel includes: a main power module 1, a backup power module 2, a switch control module 3, a nuclear power plant load module 4, an energy detection and processing module 5, a self-locking control module 6, a forced switching module 7 and a delay protection module 8;

[0033] Specifically, the main power supply module 1 is used to receive and transmit three-phase AC power and perform voltage reduction processing on the three-phase AC power;

[0034] Backup power module 2, used to provide backup power;

[0035] The switch control module 3 is connected to the main power module 1, the backup power module 2, the self-locking control module 6, the nuclear power plant load module 4 and the power detection and processing module 5, and is used to transmit the power output by the main power module 1 to the nuclear power plant load module 4 and the power detection and processing module 5. Upon receiving the switching signal output by the self-locking control module 6, the switch control module 3 stops transmitting the power to the main power module 1 and transmits the backup power to the nuclear power plant load module 4 and the power detection and processing module 5;

[0036] The nuclear power plant load module 4 is used to receive the electric energy transmitted by the switch control module 3 and supply power to the connected nuclear power plant load;

[0037] The power detection and processing module 5 is used to perform voltage reduction, rectification and filtering on the power transmitted by the switch control module 3 and output DC power, detect the power supply status of the switch control module 3, and generate a first level signal when the switch control module 3 is not transmitting power;

[0038] a forced switching module 7 connected to the power detection and processing module 5, configured to receive DC power and provide a second level signal;

[0039] A self-locking control module 6 is connected to the power detection and processing module 5, the forced switching module 7 and the delay protection module 8, and is used to receive DC power and, when receiving a first level signal or a second level signal, perform a self-locking operation and output a switching signal, provide a reset signal and perform a self-locking reset, and stop the self-locking reset operation when receiving a delay control signal output by the delay protection module 8;

[0040] The delay protection module 8 is connected to the power detection processing module 5 and the forced switching module 7, and is used to receive DC power and set the timing time. When receiving the second level signal or the switching signal, it starts the timing work and outputs the delay control signal at a regular time.

[0041] In another embodiment, see Figure 1 、 Figure 2 and Figure 3 The main power supply module 1 includes a three-phase power supply interface, a high-voltage load switch device and a dry-type transformer; the backup power supply module 2 includes a generator device; the switch control module 3 includes a first low-voltage switch K1-1 and a second low-voltage switch K1-2; the nuclear power plant load module 4 includes a nuclear power plant load interface;

[0042] Specifically, the first end, second end and third end of the three-phase power supply interface are respectively connected to the first end, second end and third end of the high-voltage load switch device, the fourth end, fifth end and sixth end of the high-voltage load switch device are respectively connected to the first end, second end and third end of the dry-type transformer, the fourth end, fifth end and sixth end of the dry-type transformer are respectively connected to the first moving end, second moving end and third moving end of the first low-voltage switch K1-1, the first end, second end and third end of the generator device are respectively connected to the first moving end, second moving end and third moving end of the second low-voltage switch K1-2, the first static end of the first low-voltage switch K1-1 is connected to the first static end of the second low-voltage switch K1-2 and the first end of the nuclear power plant load interface, the second static end of the second low-voltage switch K1-2 is connected to the second static end of the second low-voltage switch K1-2 and the second end of the nuclear power plant load interface, and the third static end of the second low-voltage switch K1-2 is connected to the third static end of the second low-voltage switch K1-2 and the third end of the nuclear power plant load interface.

[0043] In a specific embodiment, the above-mentioned high-voltage load switch device can be composed of a high-voltage vacuum load switch; the above-mentioned first low-voltage switch K1-1 can be a three-pole three-throw normally closed switch, and the second low-voltage switch K1-2 can be a three-pole three-throw normally open switch; the above-mentioned generator device can be a kerosene generator.

[0044] Furthermore, the power detection and processing module 5 includes a power processing device, a first resistor R1, a second resistor R2, a first diode D1, a first capacitor C1, a third resistor R3 and a first switch tube V1;

[0045] Specifically, the first end, the second end and the third end of the power processing device are respectively connected to the first static end, the second static end and the third static end of the first low-voltage switch K1-1, the fourth end of the power processing device is connected to the anode of the first diode D1 and the base of the first switching tube V1 through the first resistor R1, the cathode of the first diode D1 is connected to one end of the first capacitor C1 and the collector of the first switching tube V1 and the self-locking control module 6 through the third resistor R3, and the fifth end of the power processing device, the other end of the second resistor R2, the other end of the first capacitor C1 and the emitter of the first switching tube V1 are all grounded.

[0046] In a specific embodiment, the above-mentioned power processing device can be composed of a transformer and a rectifier to perform voltage reduction and rectification; the above-mentioned first resistor R1 and the second resistor R2 perform voltage sampling, and when there is power, trigger the first switch tube V1 to turn on. The first switch tube V1 can be an NPN type transistor; the above-mentioned first diode D1 performs unidirectional transmission, and the first capacitor C1 performs energy storage and filtering.

[0047] Furthermore, the self-locking control module 6 includes a second diode D2, a third diode D3, a fourth diode D4, a first logic chip IC1, a fourth resistor R4, a second switch tube V2, a third switch tube V3, a fifth resistor R5, and a first key switch S1;

[0048] Specifically, the anode of the second diode D2 is connected to the collector of the first switching tube V1, the cathode of the second diode D2 is connected to the anode of the third diode D3 and the cathode of the fourth diode D4, the cathode of the third diode D3 is connected to the A terminal of the first logic chip IC1, the B terminal of the first logic chip IC1 is connected to the collector of the second switching tube V2 and is connected to the cathode of the first diode D1 and one end of the fifth resistor R5 through the fourth resistor R4, the emitter of the second switching tube V2 and the emitter of the third switching tube V3 are both grounded, the base of the second switching tube V2 is connected to the collector of the third switching tube V3 and one end of the first push switch S1, the other end of the first push switch S1 is connected to the other end of the fifth resistor R5, the base of the third switching tube V3 is connected to the delay protection module 8, and the F terminal of the first logic chip IC1 is connected to the anode of the fourth diode D4.

[0049] In a specific embodiment, the first logic chip IC1 can be an AND gate chip, which cooperates with the third diode D3, the fourth resistor R4 and the fourth diode D4 to perform high-level signal self-locking; the second switch and the third switch tube V3 can both be NPN transistors to control the self-locking reset state of the first logic chip IC1.

[0050] Furthermore, the switch control module 3 further includes a first circuit breaker K1 and a fifth switch tube V5;

[0051] Specifically, the base of the fifth switch is connected to the F terminal of the first logic chip IC1, the emitter of the fifth switch tube V5 is grounded, the collector of the fifth switch tube V5 is connected to one end of the first circuit breaker K1, and the other end of the first circuit breaker K1 is connected to the cathode of the first diode D1.

[0052] In a specific embodiment, the first circuit breaker K1 may be a universal circuit breaker to control the switching states of the first low-voltage switch K1-1 and the second low-voltage switch K1-2; the fifth switch tube V5 may be an NPN transistor.

[0053] Furthermore, the forced switching module 7 includes a seventh resistor R7, a second key switch S2, a fifth diode D5, a fourth switch tube V4 and a sixth resistor R6;

[0054] Specifically, the first end of the second push switch S2 is connected to the collector of the fourth switch tube V4 and the cathode of the first diode D1 through the seventh resistor R7, the second end of the second push switch S2 is connected to the base of the fourth switch tube V4 and the delay protection module 8, the emitter of the fourth switch tube V4 is connected to the anode of the fifth diode D5 and is grounded through the sixth resistor R6, and the cathode of the fifth diode D5 is connected to the cathode of the second diode D2.

[0055] In a specific embodiment, the fourth switch tube V4 can be an NPN transistor.

[0056] Furthermore, the delay protection module 8 includes an eighth resistor R8, a first timer IC2, a ninth resistor R9, a second capacitor C2, a third capacitor C3, a sixth switch tube V6, a sixth diode D6 and a seventh diode D7;

[0057] Specifically, the fourth terminal and the eighth terminal of the first timer IC2 are both connected to one end of the ninth resistor R9 and the cathode of the first diode D1, and are connected to the second end of the first timer IC2 and the collector of the sixth switch tube V6 through the eighth resistor R8. The other end of the ninth resistor R9 is connected to the seventh terminal and the sixth terminal of the first timer IC2 and is grounded through the second capacitor C2. The fifth terminal of the first timer IC2 is grounded through the third capacitor C3. The emitter of the sixth switch tube V6 and the first end of the first driver are both grounded. The base of the sixth switch tube V6 is connected to the cathode of the sixth diode D6 and the cathode of the fifth diode D5. The anode of the sixth diode D6 is connected to the second end of the second key switch S2. The anode of the seventh diode D7 is connected to the F terminal of the first logic chip IC1.

[0058] In a specific embodiment, the first timer IC2 may be an NE555 integrated chip, and the timing time is adjusted by the ninth resistor R9 and the second capacitor C2; the sixth switch tube V6 may be an NPN transistor.

[0059] In a nuclear power plant UPS forced switching control board of this embodiment, three-phase AC power is connected to a three-phase electrical interface, transmitted by a high-voltage load switch device, stepped down by a dry-type transformer, and then transmitted to the nuclear power plant load and power processing device connected to the nuclear power plant load interface by a first low-voltage switch K1-1. The power processing device performs step-down rectification. When power is available, the first switch tube V1 is triggered to turn on. When power is not available, due to the energy storage of the first capacitor C1, the A terminal of the first logic chip IC1 becomes a high level. The F terminal of the first logic chip IC1 will output a high level and cooperate with the fourth diode D4 and the third diode D3 to perform a high-level self-locking operation, triggering the fifth switch tube V5 to turn on, the first circuit breaker K1 is energized, the first low-voltage switch K1-1 is disconnected, the second low-voltage switch K1-2 is closed, and the backup power output by the generator device is transmitted to the nuclear power plant through the second low-voltage switch K1-2. The load and power processing device, at the same time, the F terminal of the first logic chip IC1 triggers the sixth switch tube V6 to turn on, pulling down the second terminal of the first timer IC2, so that within the time limit, the first timer IC2 will output a high level, and then control the third switch tube V3 to turn on. Therefore, the first logic chip IC1 cannot be reset within a period of time after completing the power switching operation, that is, it cannot perform the power switching operation again. If the first push switch S1 is pressed after the time limit expires, the F terminal of the first logic chip IC1 will output a low level, the fifth switch tube V5 will be turned off, the first circuit breaker K1 loses power, and the first low-voltage switch K1-1 is reclosed. When the second push switch S2 is pressed, the power switching operation is forced, that is, the second low-voltage switch K1-2 is controlled to close. Similarly, within the time limit, it is also impossible to control the main power module 1 to resume power by pressing the first push switch S1.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0061] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A nuclear power plant UPS forced switching control panel, characterized in that: The nuclear power plant UPS forced switching control panel includes: main power module, backup power module, switch control module, nuclear power plant load module, power detection and processing module, self-locking control module, forced switching module and delay protection module; The main power supply module is used to receive and transmit three-phase AC power and perform voltage reduction processing on the three-phase AC power; The backup power supply module is used to provide backup power; The switch control module is connected to the main power module, the backup power module, the self-locking control module, the nuclear power plant load module and the power detection and processing module, and is used to transmit the power output by the main power module to the nuclear power plant load module and the power detection and processing module, and when receiving the switching signal output by the self-locking control module, stops transmitting the power to the main power module and transmits the backup power to the nuclear power plant load module and the power detection and processing module; The nuclear power plant load module is used to receive the electric energy transmitted by the switch control module and supply power to the connected nuclear power plant load; The power detection and processing module is used to perform voltage reduction, rectification and filtering processing on the power transmitted by the switch control module and output DC power, detect the power supply status of the switch control module, and generate a first level signal when the switch control module is not transmitting power; The forced switching module is connected to the power detection and processing module and is used to receive DC power and provide a second level signal; The self-locking control module is connected to the power detection and processing module, the forced switching module and the delay protection module, and is used to receive DC power and, when receiving the first level signal or the second level signal, perform self-locking and output a switching signal, provide a reset signal and perform self-locking reset, and stop the self-locking reset operation when receiving the delay control signal output by the delay protection module; The delay protection module is connected to the power detection processing module and the forced switching module, and is used to receive DC power and set the timing time. When receiving the second level signal or the switching signal, it starts the timing work and outputs the delay control signal at a regular time.

2. A nuclear power plant UPS forced switching control board according to claim 1, characterized in that: The main power module includes a three-phase power interface, a high-voltage load switch device and a dry-type transformer; the backup power module includes a generator device; the switch control module includes a first low-voltage switch and a second low-voltage switch; the nuclear power plant load module includes a nuclear power plant load interface; The first end, second end and third end of the three-phase power supply interface are respectively connected to the first end, second end and third end of the high-voltage load switch device, the fourth end, fifth end and sixth end of the high-voltage load switch device are respectively connected to the first end, second end and third end of the dry-type transformer, the fourth end, fifth end and sixth end of the dry-type transformer are respectively connected to the first moving end, second moving end and third moving end of the first low-voltage switch, the first end, second end and third end of the generator device are respectively connected to the first moving end, second moving end and third moving end of the second low-voltage switch, the first static end of the first low-voltage switch is connected to the first static end of the second low-voltage switch and the first end of the nuclear power plant load interface, the second static end of the second low-voltage switch is connected to the second static end of the second low-voltage switch and the second end of the nuclear power plant load interface, and the third static end of the second low-voltage switch is connected to the third static end of the second low-voltage switch and the third end of the nuclear power plant load interface.

3. A nuclear power plant UPS forced switching control board according to claim 2, characterized in that: The electric energy detection and processing module includes an electric energy processing device, a first resistor, a second resistor, a first diode, a first capacitor, a third resistor and a first switch tube; The first end, the second end and the third end of the power processing device are respectively connected to the first static end, the second static end and the third static end of the first low-voltage switch; the fourth end of the power processing device is connected to the anode of the first diode and the base of the first switching tube through the first resistor; the cathode of the first diode is connected to one end of the first capacitor and the collector of the first switching tube and the self-locking control module through the third resistor; the fifth end of the power processing device, the other end of the second resistor, the other end of the first capacitor and the emitter of the first switching tube are all grounded.

4. A nuclear power plant UPS forced switching control board according to claim 3, characterized in that: The self-locking control module includes a second diode, a third diode, a fourth diode, a first logic chip, a fourth resistor, a second switch tube, a third switch tube, a fifth resistor, and a first key switch; The anode of the second diode is connected to the collector of the first switching tube, the cathode of the second diode is connected to the anode of the third diode and the cathode of the fourth diode, the cathode of the third diode is connected to the A terminal of the first logic chip, the B terminal of the first logic chip is connected to the collector of the second switching tube and is connected to the cathode of the first diode and one end of the fifth resistor through the fourth resistor, the emitter of the second switching tube and the emitter of the third switching tube are both grounded, the base of the second switching tube is connected to the collector of the third switching tube and one end of the first push switch, the other end of the first push switch is connected to the other end of the fifth resistor, the base of the third switching tube is connected to the delay protection module, and the F terminal of the first logic chip is connected to the anode of the fourth diode.

5. A nuclear power plant UPS forced switching control board according to claim 4, characterized in that: The switch control module further includes a first circuit breaker and a fifth switch tube; The base of the fifth switch is connected to the F terminal of the first logic chip, the emitter of the fifth switch tube is grounded, the collector of the fifth switch tube is connected to one end of the first circuit breaker, and the other end of the first circuit breaker is connected to the cathode of the first diode.

6. A nuclear power plant UPS forced switching control board according to claim 5, characterized in that: The forced switching module includes a seventh resistor, a second key switch, a fifth diode, a fourth switch tube and a sixth resistor; The first end of the second push switch is connected to the collector of the fourth switch tube and the cathode of the first diode through the seventh resistor, the second end of the second push switch is connected to the base of the fourth switch tube and the delay protection module, the emitter of the fourth switch tube is connected to the anode of the fifth diode and grounded through the sixth resistor, and the cathode of the fifth diode is connected to the cathode of the second diode.

7. A nuclear power plant UPS forced switching control board according to claim 6, characterized in that: The delay protection module includes an eighth resistor, a first timer, a ninth resistor, a second capacitor, a third capacitor, a sixth switch tube, a sixth diode and a seventh diode; The fourth end and the eighth end of the first timer are both connected to one end of the ninth resistor and the cathode of the first diode and are connected to the second end of the first timer and the collector of the sixth switch tube through the eighth resistor. The other end of the ninth resistor is connected to the seventh end and the sixth end of the first timer and is grounded through the second capacitor. The fifth end of the first timer is grounded through the third capacitor. The emitter of the sixth switch tube and the first end of the first driver are both grounded. The base of the sixth switch tube is connected to the cathode of the sixth diode and the cathode of the fifth diode. The anode of the sixth diode is connected to the second end of the second push switch. The anode of the seventh diode is connected to the F end of the first logic chip.

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