Circuit for controlling fuel delivery pump of diesel engine of high-temperature gas cooled reactor nuclear power plant
By designing a circuit for a diesel engine fuel delivery pump in a high-temperature gas-cooled reactor nuclear power plant, the system achieves precise screening of fault signals during power outages outside the plant, avoids accidental start-up of dual pumps, ensures equipment stability and reliability, and reduces maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-03-13
AI Technical Summary
In the emergency power system of a high-temperature gas-cooled reactor nuclear power plant, when the external power supply is interrupted, two fuel transfer pumps may start simultaneously by mistake, leading to equipment shock, reduced stability, and increased maintenance costs.
Design a circuit that uses a combination of a main pump power switch, a thermal relay, a bus voltage monitoring relay, a fault remote transmission relay, and a standby pump start control relay to achieve precise screening of fault signals, ensuring that the standby pump is only triggered when a real fault exists.
This solves the problem of simultaneous accidental start-up of two pumps, ensures the backup function of the standby pump, reduces equipment wear and maintenance costs, and improves operational stability and reliability.
Smart Images
Figure CN121654544A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of auxiliary power distribution technology for emergency diesel generators, and more specifically to a circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant. Background Technology
[0002] The emergency power system of the high-temperature gas-cooled reactor demonstration project consists of emergency diesel generator sets and a power distribution system. In addition to the core diesel engine and generator, the emergency diesel generator sets are equipped with auxiliary systems such as fuel system, lubrication system, starting air system, intake and exhaust system, and cooling water system. The normal power supply of these auxiliary systems comes from the auxiliary machine distribution cabinet bus.
[0003] The fuel system is crucial for ensuring the continuous operation of the emergency diesel generator. This system includes a main fuel storage tank and a day fuel tank. Normally, the fuel is stored in the main fuel storage tank. After the emergency diesel generator is started, the fuel needs to be transferred from the main fuel storage tank to the day fuel tank through two electric fuel transfer pumps (fuel transfer pump 1 and fuel transfer pump 2), one for use and one for standby.
[0004] However, when the emergency busbar's normal power supply is interrupted, the auxiliary power distribution busbar will also lose power simultaneously. Since the auxiliary power switch's control power is drawn from the auxiliary power distribution cabinet busbar, if the auxiliary power distribution cabinet's power supply is interrupted, the system will mistakenly send a "fuel delivery pump 1 fault" signal to the safety-level control cabinet. Upon receiving the signal, the safety-level control cabinet will immediately issue a start command to the standby fuel delivery pump 2. The moment the emergency diesel generator starts and the auxiliary power distribution cabinet regains power, fuel delivery pump 1 starts normally because the start conditions are met, and the previous start command will still trigger fuel delivery pump 2 to start, ultimately causing both pumps to run simultaneously.
[0005] Running two pumps in parallel will impact the oil pipeline and cause the standby pump to lose its backup function. This will not only reduce the stability of equipment operation and accelerate equipment aging and damage, but also reduce system efficiency and increase maintenance costs. Summary of the Invention
[0006] This invention provides a circuit for controlling the diesel engine fuel delivery pump in a high-temperature gas-cooled reactor nuclear power plant, in order to solve the problem of two fuel delivery pumps starting simultaneously when the external power supply is lost in the prior art.
[0007] This invention provides a circuit for controlling a diesel engine fuel transfer pump in a high-temperature gas-cooled reactor nuclear power plant. The circuit includes: a main pump power switch, a main pump thermal relay, a main pump bus voltage monitoring relay, a main pump control circuit power monitoring relay, a main pump fault remote transmission relay, and a standby pump start control relay. One end of the main pump power switch is connected to the busbar of the auxiliary power distribution cabinet, and the other end of the main pump power switch is connected to one end of the main pump thermal relay. The other end of the main pump thermal relay is connected to the motor of the main fuel delivery pump through a power cable. The coil of the main pump bus voltage monitoring relay is installed between any two phases of the auxiliary equipment distribution cabinet bus to monitor the voltage status of the auxiliary equipment distribution cabinet bus. One end of the coil of the main pump control circuit power monitoring relay is connected to the control power supply led out from the upper port of the main pump power switch, and the other end of the coil of the main pump control circuit power monitoring relay is connected to the neutral line. The main pump control circuit power monitoring relay is used to monitor the energized state of the control power supply of the main pump power switch. One end of the normally open auxiliary contact of the main pump power switch and one end of the normally open auxiliary contact of the main pump thermal relay are respectively connected to one end of the coil of the main pump control circuit power monitoring relay. The other end of the normally open auxiliary contact of the main pump power switch and the normally open auxiliary contact of the main pump thermal relay are respectively connected to one end of the coil of the main pump fault remote transmission relay. The other end of the coil of the main pump fault remote transmission relay is connected to the neutral line. The normally closed contact of the main pump control circuit power monitoring relay and the normally open contact of the main pump fault remote transmission relay are connected in parallel to form a parallel branch. The parallel branch is connected in series with the normally open contact of the main pump bus voltage monitoring relay and then connected to the safety-grade control cabinet through a terminal. The standby pump start control relay is connected in series in the main fuel delivery pump fault status response circuit of the safety-grade control cabinet, and the normally open contact of the standby pump start control relay is connected in series in the start command circuit of the standby fuel delivery pump.
[0008] This invention provides a circuit for controlling the diesel engine fuel transfer pump in a high-temperature gas-cooled reactor nuclear power plant. The circuit connects the main fuel transfer pump's control power failure signal in parallel with actual fault signals such as motor thermal overload and power circuit short circuit, and then connects them in series with the normally open contact of the main pump bus voltage monitoring relay to achieve precise fault signal filtering. When the auxiliary equipment distribution cabinet bus is energized, a real fault triggers the start of the standby pump; when the bus loses power, the standby pump is not triggered, and only the main fuel transfer pump starts normally after the bus power supply is restored. This solves the problem of simultaneous erroneous starting of both pumps after the diesel generator starts and the auxiliary equipment distribution cabinet power is restored following an emergency bus power failure in the high-temperature gas-cooled reactor emergency power system. It ensures the backup function of the standby pump, reduces equipment wear and maintenance costs, and improves the operational stability and reliability of the high-temperature gas-cooled reactor emergency diesel generator set.
[0009] In one alternative embodiment, the circuit further includes a main pump contactor connected in series between the main pump power switch and the main pump thermal relay.
[0010] In an optional embodiment, the circuit further includes: a main pump control circuit power supply fuse, the fuse being connected in series between the control power supply led out from the main pump power switch and the main pump control circuit power supply monitoring relay.
[0011] In one alternative implementation, when the auxiliary power distribution cabinet busbar loses power, the coil of the main pump busbar voltage monitoring relay loses power, and its normally open contact opens.
[0012] In one optional implementation, when the control power supply of the main pump power switch fails, the coil of the main pump control circuit power monitoring relay is de-energized, and its normally closed contact closes to conduct.
[0013] In one alternative implementation, When the motor of the main fuel delivery pump experiences thermal overload, the main pump thermal relay activates, its normally open auxiliary contact closes, and the coil of the main pump fault remote transmission relay is energized. When a short circuit fault occurs in the power supply circuit of the main fuel delivery pump, the main pump power switch protection trips, its normally open auxiliary contact closes, and the coil of the main pump fault remote transmission relay is energized.
[0014] In one optional embodiment, the circuit further includes: a main pump fault indicator light, one end of which is connected to the normally open auxiliary contact of the main pump thermal relay and the normally open auxiliary contact of the main pump power switch, and the other end of which is connected to the neutral line.
[0015] In one alternative implementation, when the external power supply is lost, the short-term power outage time of the auxiliary equipment distribution cabinet busbar is consistent with the start-up power supply time of the emergency diesel generator set.
[0016] In one optional implementation, when the safety-level control cabinet receives a fault signal from the main fuel delivery pump via a terminal, it energizes the coil of the standby pump start control relay, causing its normally open contact to open and send a start command to the standby fuel delivery pump. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a circuit diagram of a diesel engine fuel delivery pump control for a high-temperature gas-cooled reactor nuclear power plant, according to an embodiment of the present invention. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.
[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0022] This invention provides a circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant, such as... Figure 1 As shown, it includes: main pump power switch QF, main pump thermal relay KH, main pump bus voltage monitoring relay KA1, main pump control circuit power monitoring relay KA2, main pump fault remote transmission relay KA3, and standby pump start control relay KA4.
[0023] One end of the main pump power switch QF is connected to the auxiliary machine distribution cabinet busbar, and the other end of the main pump power switch QF is connected to one end of the main pump thermal relay KH. The other end of the main pump thermal relay KH is connected to the main fuel delivery pump (i.e., fuel transfer pump) via a power cable. Figure 1The circuit includes a main pump contactor KM connected in series between the main pump power switch QF and the main pump thermal relay KH to control the on / off state of the main fuel delivery pump's power circuit. Specifically, the power supply for the fuel delivery pump 1 is taken from the auxiliary equipment distribution cabinet busbar. Three-phase AC power passes sequentially through the main pump power switch QF, the main pump contactor KM, and the main pump thermal relay KH, and then is transmitted to the motor of the fuel delivery pump 1 via a power cable, providing a stable power supply to the motor. Fault signals for the fuel delivery pump 1 include power failure, operation of the main pump thermal relay KH, and tripping of the main pump power switch QF. The main pump power switch QF is a short-circuit protection switch for the main pump's power circuit. When a short-circuit fault occurs in the main pump motor's power circuit, QF will automatically trip, cutting off the power supply. At this time, its normally open auxiliary contacts 81-84 will close simultaneously. The main pump thermal relay KH is an overload protection switch for the main pump motor. When the main pump motor is overloaded or the temperature is too high, KH will activate and trigger the overload protection. At this time, its normally open auxiliary contacts 97-98 will close.
[0024] The coil of the main pump bus voltage monitoring relay KA1 is installed between any two phases of the auxiliary equipment distribution cabinet bus to monitor the voltage status of the auxiliary equipment distribution cabinet bus. One end of the coil of the main pump control circuit power monitoring relay KA2 is connected to the control power supply from the upper port of the main pump power switch QF, and the other end of the coil is connected to the neutral line. The main pump control circuit power monitoring relay KA2 is used to monitor the energized status of the control power supply of the main pump power switch QF. Specifically, the coil of KA1 is directly connected to any two phases of the auxiliary equipment distribution cabinet bus (…). Figure 1 Taking AC phase connection as an example, when the auxiliary machine distribution cabinet bus is energized, the coil of the main pump bus voltage monitoring relay KA1 is energized, and its normally open contacts 13-14 close, allowing fault signal transmission; when the auxiliary machine distribution cabinet bus is de-energized, the coil of the main pump bus voltage monitoring relay KA1 is de-energized, and its normally open contacts 13-14 open, blocking fault signal transmission and preventing the control power failure from being mistakenly identified as a main pump fault. The coil of KA2 is connected between the control power supply and the neutral line at the upper port of the main pump power switch QF. When the control power supply of the main pump power switch QF is energized, the coil of KA2 is energized, and its normally closed contacts 21-22 open; when the control power supply of the main pump power switch QF is de-energized, the coil of KA2 is de-energized, and its normally closed contacts 21-22 close and conduct, forming a signal path for control power failure, thereby identifying the control power failure fault.
[0025] One end of the normally open auxiliary contacts 81-84 of the main pump power switch QF and one end of the normally open auxiliary contacts 97-98 of the main pump thermal relay KH are respectively connected to one end of the coil of the main pump control circuit power monitoring relay KA2. The other end of the normally open auxiliary contacts 81-84 of the main pump power switch QF and one end of the normally open auxiliary contacts 97-98 of the main pump thermal relay KH are respectively connected to one end of the coil of the main pump fault remote transmission relay KA3. The other end of the coil of the main pump fault remote transmission relay KA3 is connected to the neutral line. Specifically, when the motor of the main fuel delivery pump experiences thermal overload, the main pump thermal relay KH activates, its normally open auxiliary contacts 97-98 close, the coil of the main pump fault remote transmission relay KA3 is energized, and its normally open contacts 13-14 close and conduct. When a short circuit fault occurs in the power supply circuit of the main fuel delivery pump, the main pump power switch QF protection trips, its normally open auxiliary contacts 81-84 close, the coil of the main pump fault remote transmission relay KA3 is energized, and its normally open contacts 13-14 close to conduct.
[0026] The normally closed contacts 21-22 of the main pump control circuit power monitoring relay KA2 and the normally open contacts 13-14 of the main pump fault remote transmission relay KA3 are connected in parallel to form a parallel branch. This parallel branch is then connected in series with the normally open contact 13-14 of the main pump bus voltage monitoring relay KA1, and finally connected to the safety control cabinet via terminal XT:12-16. Specifically, the normally closed contact 21-22 of KA2 corresponds to the fault signal of main pump control power failure. When the control power fails, KA2 also loses power, and its normally closed contact 21-22 closes, thereby reporting the control power failure fault. Normally open contacts 13-14 of KA3 correspond to actual fault signals of the main pump (including two scenarios: motor overload and power circuit short circuit). When the main pump motor is overloaded, the thermal relay KH is triggered; when a short circuit occurs in the main pump power circuit, the power switch QF triggers the protection trip. In both cases, KA3 is energized, and its normally open contacts 13-14 close, thereby reporting the overload or short circuit fault. Regardless of whether a control power supply failure, motor overload, or power circuit short circuit occurs, as long as any fault scenario occurs, this parallel branch will be activated, aggregating the two types of fault signals to the same transmission path, ensuring that no fault signal is missed.
[0027] The standby pump start control relay KA4 is connected in series in the main fuel delivery pump fault status response circuit of the safety-grade control cabinet. The normally open contacts 13-14 of the standby pump start control relay KA4 are connected in series in the standby fuel delivery pump start command circuit. When the safety-grade control cabinet receives a fault signal from the main fuel delivery pump via terminal XT:12-16, it energizes the coil of the standby pump start control relay KA4, causing its normally open contacts 13-14 to conduct and sending a start command to the standby fuel delivery pump. Specifically, after receiving a fault signal from the main fuel delivery pump via terminal XT:12-16, the safety-grade control cabinet controls the main fuel delivery pump fault status response circuit to conduct, outputting current to the coil of the standby pump start control relay KA4, thus energizing it. When the KA4 coil is energized, its normally open contacts 13-14, which are connected in series in the start command circuit of the standby fuel delivery pump, close and conduct. The closure of these contacts connects the start circuit of the standby fuel delivery pump, and the start command is transmitted to the standby fuel delivery pump through these contacts, driving it to start and take over from the main pump to complete the fuel delivery operation.
[0028] This invention provides a circuit for controlling the diesel engine fuel transfer pump in a high-temperature gas-cooled reactor nuclear power plant. The circuit connects the main fuel transfer pump's control power failure signal in parallel with actual fault signals such as motor thermal overload and power circuit short circuit, and then connects them in series with the normally open contact of the main pump bus voltage monitoring relay to achieve precise fault signal filtering. When the auxiliary equipment distribution cabinet bus is energized, a real fault triggers the start of the standby pump; when the bus loses power, the standby pump is not triggered, and only the main fuel transfer pump starts normally after the bus power supply is restored. This solves the problem of simultaneous erroneous starting of both pumps after the diesel generator starts and the auxiliary equipment distribution cabinet power is restored following an emergency bus power failure in the high-temperature gas-cooled reactor emergency power system. It ensures the backup function of the standby pump, reduces equipment wear and maintenance costs, and improves the operational stability and reliability of the high-temperature gas-cooled reactor emergency diesel generator set.
[0029] In one alternative implementation, such as Figure 1 As shown, the circuit also includes: a main pump control circuit power supply fuse FU, which is connected in series between the control power supply led out from the upper port of the main pump power switch QF and the main pump control circuit power supply monitoring relay KA2.
[0030] Specifically, when the current of the control power supply is within the rated range, the fuse of FU remains intact, and the current can flow smoothly through FU to the KA2 coil. At this time, FU does not affect the normal operation of the control circuit, and KA2 can monitor the energized state of the control power supply normally. If the insulation of the control circuit wires is damaged, or the KA2 coil is short-circuited, the control circuit current will increase sharply, exceeding the rated current of FU. At this time, the fuse of FU will melt rapidly due to overheating, directly cutting off the connection between the control power supply and KA2. This prevents the excessive current from burning out the KA2 coil and the control circuit wires, and also avoids the fault current from affecting the main control power supply at the QF port, thus isolating the fault and protecting the equipment.
[0031] In one alternative implementation, such as Figure 1 As shown, the circuit also includes: a main pump fault indicator light HR, one end of which is connected to the normally open auxiliary contacts 97-98 of the main pump thermal relay KH and the normally open auxiliary contacts 81-84 of the main pump power switch QF, and the other end of which is connected to the neutral line.
[0032] Specifically, when the motor of the main fuel delivery pump experiences thermal overload, the main pump thermal relay KH will be triggered; or when a short circuit fault occurs in the power supply circuit of the main fuel delivery pump, the main pump power switch QF will trigger a protection trip. In both of these real-world fault scenarios, the coil of the main pump fault remote transmission relay KA3 will be energized, and the main pump fault indicator light HR will illuminate simultaneously.
[0033] By configuring the main pump fault indicator light HR and the main pump fault remote transmission relay KA3, a dual fault indication mechanism is constructed, which combines on-site visual indication with remote signal transmission from the background. HR provides real-time on-site warnings and intuitive feedback on the main pump fault status; KA3 is responsible for transmitting the fault signal to the safety-grade control cabinet, triggering the subsequent standby pump to start. The two work together to ensure the timeliness and reliability of fault response.
[0034] In one alternative implementation, when the external power supply is lost, the short-term power outage time of the auxiliary equipment distribution cabinet busbar is consistent with the start-up power supply time of the emergency diesel generator set.
[0035] Specifically, when the external power supply is lost, the auxiliary power distribution cabinet bus will simultaneously lose power (the short-term power outage period is about 20 seconds, precisely matching the starting power supply time of the emergency diesel generator set). At this time, the bus voltage monitoring relay KA1 loses power due to the loss of power supply, and its normally open contacts 13-14 open accordingly, directly blocking the transmission path of the fault signal. Even if the control power supply of fuel delivery pump 1 is interrupted with the loss of power to the bus, causing the main pump control circuit power monitoring relay KA2 to lose power and its normally closed contacts 21-22 to close, forming a signal path for the loss of control power, since the normally open contact 13-14 of KA1 has been opened, this non-pump body fault signal cannot be transmitted to the safety-level control cabinet through terminal XT:12-16, and the backup fuel delivery pump (fuel delivery pump 2) will not be mistakenly triggered to start.
[0036] After 20 seconds, the emergency diesel generator set starts and supplies stable power to the auxiliary power distribution cabinet bus, ending the short-term power outage. At this time, the bus voltage monitoring relay KA1 is energized again, and its normally open contacts 13-14 close, restoring the fault signal transmission path. The power supply and control power supply of fuel transfer pump 1 are restored synchronously, and it starts normally after meeting the starting conditions, continuously completing the fuel transfer operation from the main storage tank to the daytime fuel tank. The standby pump remains in its original standby state, and will only start after receiving a valid fault signal from the safety-level control cabinet when the main pump experiences a real fault such as motor thermal overload or power circuit short circuit, ensuring that its standby function is not disabled.
[0037] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A circuit for controlling a diesel engine fuel delivery pump in a high-temperature gas-cooled reactor nuclear power plant, characterized in that, The circuit includes: a main pump power switch, a main pump thermal relay, a main pump bus voltage monitoring relay, a main pump control circuit power monitoring relay, a main pump fault remote transmission relay, and a standby pump start control relay. One end of the main pump power switch is connected to the busbar of the auxiliary power distribution cabinet, and the other end of the main pump power switch is connected to one end of the main pump thermal relay. The other end of the main pump thermal relay is connected to the motor of the main fuel delivery pump through a power cable. The coil of the main pump bus voltage monitoring relay is installed between any two phases of the auxiliary equipment distribution cabinet bus to monitor the voltage status of the auxiliary equipment distribution cabinet bus. One end of the coil of the main pump control circuit power monitoring relay is connected to the control power supply led out from the upper port of the main pump power switch, and the other end of the coil of the main pump control circuit power monitoring relay is connected to the neutral line. The main pump control circuit power monitoring relay is used to monitor the energized state of the control power supply of the main pump power switch. One end of the normally open auxiliary contact of the main pump power switch and one end of the normally open auxiliary contact of the main pump thermal relay are respectively connected to one end of the coil of the main pump control circuit power monitoring relay. The other end of the normally open auxiliary contact of the main pump power switch and the normally open auxiliary contact of the main pump thermal relay are respectively connected to one end of the coil of the main pump fault remote transmission relay. The other end of the coil of the main pump fault remote transmission relay is connected to the neutral line. The normally closed contact of the main pump control circuit power monitoring relay and the normally open contact of the main pump fault remote transmission relay are connected in parallel to form a parallel branch. The parallel branch is connected in series with the normally open contact of the main pump bus voltage monitoring relay and then connected to the safety-grade control cabinet through a terminal. The standby pump start control relay is connected in series in the main fuel delivery pump fault status response circuit of the safety-grade control cabinet, and the normally open contact of the standby pump start control relay is connected in series in the start command circuit of the standby fuel delivery pump.
2. The circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, The circuit also includes a main pump contactor, which is connected in series between the main pump power switch and the main pump thermal relay.
3. The circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant according to claim 2, characterized in that, The circuit also includes a main pump control circuit power supply fuse, which is connected in series between the control power supply led out from the main pump power switch and the main pump control circuit power supply monitoring relay.
4. The circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, When the auxiliary equipment distribution cabinet busbar loses power, the coil of the main pump busbar voltage monitoring relay loses power, and its normally open contact opens.
5. The circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, When the control power supply of the main pump power switch fails, the coil of the main pump control circuit power monitoring relay is de-energized, and its normally closed contact closes to conduct.
6. The circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, When the motor of the main fuel delivery pump experiences thermal overload, the main pump thermal relay activates, its normally open auxiliary contact closes, and the coil of the main pump fault remote transmission relay is energized. When a short circuit fault occurs in the power supply circuit of the main fuel delivery pump, the main pump power switch protection trips, its normally open auxiliary contact closes, and the coil of the main pump fault remote transmission relay is energized.
7. The circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant according to claim 3, characterized in that, The circuit also includes a main pump fault indicator light, one end of which is connected to the normally open auxiliary contact of the main pump thermal relay and the normally open auxiliary contact of the main pump power switch, and the other end of which is connected to the neutral line.
8. The circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, When the external power supply is lost, the short-term power loss time of the auxiliary equipment distribution cabinet busbar is the same as the start-up power supply time of the emergency diesel generator set.
9. The circuit for controlling the fuel delivery pump of a diesel engine in a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, When the safety-level control cabinet receives a fault signal from the main fuel delivery pump via a terminal, the coil of the backup pump start control relay is energized, its normally open contact is closed, and a start command is sent to the backup fuel delivery pump.