Standby diesel generator system

Abstract

The utility model discloses a standby diesel generator system, which is characterized by comprising a diesel generator, a remote closing module, a self-starting module, a manual starting module and an electric appliance, the self-starting module is connected with the diesel generator, the manual starting module is connected with the diesel generator, the diesel generator is connected with the remote closing module, the remote closing module is connected with the electric appliance, and the electric appliance is connected with the self-starting module. According to the utility model, through the self-starting module, the diesel generator can be self-started, so that the problems that the diesel generator is started for a long time under the condition that standby energy is needed and is difficult to start under the condition that electric power is completely lost are solved; the diesel generator system has relative independence, and the input condition is only limited to the unique condition that the electric appliance loses voltage and is not limited by other external conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, in particular to a standby diesel generator system. Background Art

[0002] Special diesel generator sets are commonly used as emergency power sources for AC accidents in power plants under construction. Their characteristics are: 1. The operation of diesel generator sets is not affected by the operation of the power system and is an independent and reliable power source. It starts quickly and can meet the requirements of AC accident loads in power plants that allow short-term power interruptions. 2. There are many levels of manufacturing capacity for diesel generator sets, and the appropriate equipment capacity can be selected and configured according to needs. 3. Diesel generator sets can operate for a long time and meet the power supply requirements for long-term accident power outages. 4. Diesel generator sets have compact structures, relatively simple auxiliary equipment, high thermal efficiency, and good economy.

[0003] If the power plant has only one power supply line, in the event of a power grid failure or collapse or an accident in the power plant's power generation and supply equipment causing all the units in operation to trip and shut down, resulting in a power outage, it is necessary to use the 220kV system or diesel generators to gradually restore the power plant's power supply, or use a single unit to self-start and provide power for the plant, and cooperate with system scheduling to gradually restore the operation of other units, main transformers and the 220kV system.

[0004] However, Shannipo Power Plant has only one 220KV Taishan outgoing line. There are several problems with using diesel generators at this time: first, with only one outgoing line, the probability of line failure is relatively high, resulting in loss of pressure in the entire plant; second, when the AC power supply of the entire plant disappears, the diesel generator cannot start automatically, and the three water inlet valves are hydraulic and cannot be opened, making it impossible to start the unit to power the plant, start the water collection well pump to drain water, and open the spillway gate; seriously threatening the safety of equipment and facilities; third, due to the small number of team members, their young age, and weak business skills, manually starting the diesel generator to power the plant requires many operating steps and a long operation time. In extreme weather conditions, factory flooding and dam collapse accidents may occur.

[0005] In the prior art, there are relatively few self-starting standby diesel generator systems, and the structures of self-starting standby diesel generator systems are relatively complex, and the installation and maintenance costs are high.

[0006] For example, the Chinese patent with the announcement number CN209626982U discloses a diesel generator system, including: a diesel generator set, which is connected to an AC bus and is used to provide electric energy to a load connected to the AC bus; a data detection unit, which is connected to the AC bus and is used to collect data of the AC bus in real time and generate control instructions according to the data of the AC bus; an energy storage unit, which is connected to the data detection unit and is discharged according to the control instructions, so that the energy storage unit can serve as a backup of the diesel generator set, and discharges according to the control instructions when an abnormality occurs in the diesel generator set, so as to solve the problem of power load fluctuation in the diesel generator set power supply network in the isolated grid mode and the problem of diesel generator set failure and exiting parallel operation in individual emergencies while ensuring the load efficiency of the diesel generator set. However, this patent is mainly used to solve the problem of energy storage and power load fluctuation, and has no self-starting function or closing function, so it provides little help in solving the technical problem of using diesel generators as backup energy by controlling the transmission of the diesel generator set.

[0007] For example, the Chinese patent with the announcement number CN214170715U discloses a diesel generator self-starting system, which belongs to the technical field of diesel generators. The diesel generator self-starting system includes a diesel engine section bus, a security section bus, a 400V I section bus and a 400VII section bus. The diesel engine section bus is connected in parallel with a diesel engine outlet switch and a diesel engine section to security section switch. The security section bus is connected in parallel with a security section standby power supply incoming switch and a security section main power supply incoming switch. The 400V I section bus is connected in series with a security section main power switch A, and the 400VII section bus is connected in series with a security section main power switch B. This patent realizes the self-starting function, but it needs to cooperate with the DCS control system, and its laying cost is high, and it also requires software development costs; it lacks a remote closing function, and it is impossible to manually determine whether to use the diesel generator for power supply. It is not applicable in an environment where the environment is more severe and manual determination is required to start the diesel generator; at the same time, only the self-starting function is set, and the manual starting function is lacking, which is not flexible enough and lacks versatility. Utility Model Content

[0008] In order to solve the above problems, the utility model provides a backup diesel generator system.

[0009] The utility model adopts the following technical solutions:

[0010] The utility model provides a backup diesel generator system, comprising a diesel engine, a remote closing module, a self-starting module, a manual starting module and electrical appliances; the self-starting module is connected to the diesel generator, the manual starting module is connected to the diesel generator, the diesel generator is connected to the remote closing module, the remote closing module is connected to the electrical appliances, and the electrical appliances are connected to the self-starting module.

[0011] Preferably, the diesel generator comprises a diesel generator body and a diesel generator control box, the manual starting module is connected to the diesel generator control box, the self-starting module is connected to the diesel generator control box, the diesel generator control box is connected to the diesel generator body, and the diesel generator body is connected to the remote closing module.

[0012] Preferably, the electrical appliance comprises a first electrical appliance and a second electrical appliance; and the remote closing module is connected to the first electrical appliance and the second electrical appliance respectively.

[0013] Preferably, the remote closing module comprises a first circuit breaker and a second circuit breaker; the first circuit breaker is connected to a first electrical appliance; one side of the second circuit breaker is connected to the first circuit breaker, and the other side is connected to the second electrical appliance.

[0014] Preferably, the first circuit breaker is an air circuit breaker, and the second circuit breaker is an air circuit breaker.

[0015] Preferably, the self-starting module comprises a three-phase voltage relay, one side of the three-phase voltage relay is connected to the electrical appliance, and the other side of the three-phase voltage relay is connected to the diesel generator.

[0016] Preferably, the three-phase voltage relay is connected in series to the diesel generator control box via a normally closed contact.

[0017] The utility model has the following beneficial effects:

[0018] 1. The self-starting module enables the diesel generator to start automatically, solving the problem that the diesel generator takes a long time to start when backup energy is needed and is difficult to start when power is completely lost.

[0019] 2. The diesel generator system is relatively independent, and its input condition is limited to the only condition that the electrical appliances lose voltage, and is not restricted by other external conditions.

[0020] 3. After the diesel engine is started, the operator manually operates the remote closing module in the factory to connect the electrical appliances, which has high reliability.

[0021] 4. The system has a simple structure, requires few components, and has low installation costs. It also requires no additional software costs and has low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the system provided by the utility model;

[0023] Figure 2 It is a schematic diagram of a power plant circuit provided by an embodiment of the utility model;

[0024] Figure 3 It is a schematic diagram of the system wiring circuit provided by the embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of a large factory area system circuit provided by an embodiment of the utility model;

[0026] Figure 5 It is a schematic diagram of the dam area system circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1:

[0029] like Figure 1 As shown, a backup diesel generator system includes a diesel generator 1, a remote closing module 2, a self-starting module 3, a manual starting module 4 and an electrical appliance 5; the self-starting module 3 is connected to the diesel generator 1, the manual starting module 4 is connected to the diesel generator 1, the diesel generator 1 is connected to the remote closing module 2, the remote closing module 2 is connected to the electrical appliance 5, and the electrical appliance 5 is connected to the self-starting module 3.

[0030] The diesel generator 1 includes a diesel generator body and a diesel generator control box, the manual starting module 4 is connected to the diesel generator control box, the self-starting module 3 is connected to the diesel generator control box, the diesel generator control box is connected to the diesel generator body, and the diesel generator body is connected to the remote closing module 2.

[0031] The electrical appliance 5 includes a first electrical appliance and a second electrical appliance; the remote closing module 2 is connected to the first electrical appliance and the second electrical appliance respectively.

[0032] The remote closing module 2 includes a first circuit breaker and a second circuit breaker; the first circuit breaker is connected to a first electrical appliance; one side of the second circuit breaker is connected to the first circuit breaker, and the other side is connected to the second electrical appliance.

[0033] Only when the staff operates the circuit breaker in the remote closing module 2 to close, the diesel generator 1 can supply power to the electrical appliance 5. The remote closing module 2 ensures the reliability of the entire diesel generator system and determines which electrical appliance to supply power.

[0034] The first circuit breaker is an air circuit breaker, and the second circuit breaker is an air circuit breaker.

[0035] Air circuit breakers not only act as switches, but also protect circuits.

[0036] The self-starting module 3 includes a three-phase voltage relay, one side of which is connected to the electrical appliance 5 , and the other side of which is connected to the diesel generator 1 .

[0037] The three-phase voltage relay is connected in series to the diesel generator control box via a normally closed contact.

[0038] By connecting one side of the three-phase voltage relay to the electrical appliance 5, the function of judging whether the electrical appliance 5 loses power is achieved.

[0039] The three-phase voltage relay is connected in series to the diesel generator control box through the normally closed contacts. When the mains power disappears, the voltage relay contacts automatically close to start the generator, realizing the self-starting function.

[0040] Shannipo Hydropower Plant now has only one outgoing line, the 220KV Taishan Line. During the main flood season, the units are in full power state. When the line is tripped by lightning or the system fails, the line protection action will cause the whole plant to lose pressure. The line failure cannot temporarily restore normal power supply. If the unit closes the butterfly valve due to over-speed action due to load shedding, it cannot start to supply power to the plant. At this time, it may encounter extreme situations such as opening the gate to release floodwater at the same time. At this time, manually starting the emergency power diesel generator to handle the accident and open the gate to release floodwater will be unfavorable for restoring power to the plant, delay the accident handling, and even cause the accident to expand. Therefore, it is urgent to transform the diesel generator to start automatically after the city power disappears to ensure the safe and stable operation of the power plant.

[0041] like Figure 2 As shown, in this embodiment, the standby diesel generator system is connected to the power system of the large factory building, and the A, B, and C three-phase voltage relays are installed at the low-voltage side of the circuit breaker 411 of the large factory building near 41B, such as Figure 3 As shown, KA1 / KA2 / KA3 represent three phases, and the normally closed contacts of the voltage relay are connected in series to the remote starting contacts of the generator control box.

[0042] like Figure 4As shown, in this embodiment, the self-starting module also includes a diesel generator 483 incoming line circuit breaker, the first circuit breaker is circuit breaker 481, the second circuit breaker is circuit breaker 410, the first electrical appliance is the large factory building 400VI section, and the second electrical appliance is the large factory building 400VII section.

[0043] Switch the diesel generator control box to the automatic position, and the diesel generator incoming line air circuit breaker 483 is in the open state; the air circuit breaker 4831 is in the closed state. When the city power disappears, the voltage relay contacts are closed to start the diesel generator, and the operator remotely operates the incoming line switch circuit breaker 411 of the plant 400VI section to disconnect, confirm that the circuit breaker 411 is in the disconnected position, and manually close the diesel generator incoming line air circuit breaker 481, and then the plant 400VI section can be powered. When the 400VI section needs to be connected to the II section, the operator remotely operates the incoming line switch circuit breaker 421 of the plant 400VII section to disconnect, confirm that the circuit breaker 421 is in the disconnected position, and remotely closes the 400VI section II connecting switch circuit breaker 410, and then the 400VI section connecting the II section can be powered.

[0044] When other operating modes are needed, such as preventive tests or routine starting of the diesel generator, switch the diesel generator control box to the manual position and start the diesel generator through the manual starting module.

[0045] Embodiment 2:

[0046] like Figure 2 As shown, in this embodiment, the standby diesel generator system is connected to the dam area power system, and A, B, C three-phase voltage relays are installed at the low-voltage side of the dam area circuit breaker 441 near 44B, such as Figure 3 As shown, KA1 / KA2 / KA3 represent three phases, and the normally closed contacts of the voltage relay are connected in series to the remote starting contacts of the generator control box.

[0047] like Figure 5 As shown, in this embodiment, the self-starting module also includes a diesel generator incoming line circuit breaker 482, the first circuit breaker is circuit breaker 482, the second circuit breaker is circuit breaker 420, the first electrical appliance is the dam area 400VI section, and the second electrical appliance is the dam area 400VII section.

[0048] Switch the diesel generator control box to the automatic position, the diesel generator incoming line circuit breaker 482 is in the working position and in the open state; the air circuit breaker 4821 is in the closed state. When the city power disappears, the voltage relay contacts close and the diesel generator is started. The operator remotely operates the incoming line circuit breaker 441 of the dam area 400VII section to disconnect, confirm that the circuit breaker 441 has been disconnected, close the diesel generator incoming line circuit breaker 482, and then the dam area 400VII section can be powered. When the 400VII section needs to be operated in conjunction with the I section, the operator remotely operates the incoming line switch circuit breaker 431 of the dam area 400VI section to disconnect, confirm that the circuit breaker 431 has been disconnected, and remotely close the 400VI section II section connecting switch circuit breaker 420, and then the 400VII section connecting section I can be powered.

[0049] Since the emergency power supply equipment may not be used for a long time, but must be put into operation immediately when needed, its reliability is required to be very high. To ensure its reliability, the diesel engine is started by the operator manually operating the jump switch remotely in the factory to operate the factory system. In the above embodiment, a system failure is simulated every month to cause the whole factory to lose pressure and allow the diesel generator to start automatically, and the success rate of each simulation is 100%, ensuring the reliable operation of the diesel generator during the flood season. After two years of operation practice, everything is running normally, and there has been no diesel generator misstart or failure.

[0050] In the above embodiments, modifications are made to the original power supply system, and the emergency power supply equipment can meet the maximum capacity requirements for continuous operation of the accident load and the capacity requirements for starting the motor load.

[0051] Two years of long-term experiments have proven that the power supply can be restored and the equipment can be put into operation again within the maximum power interruption time allowed by the equipment.

[0052] The modified system can better adapt to the high-efficiency work requirements of the power plant, without adding extra workload in operation and maintenance. The operation is simple, convenient, intuitive and easy to master. It does not force operators to master controller knowledge to operate it. The plant electricity can be generated in a few minutes, and the diesel generator automatically adjusts according to load changes. It not only reflects the advanced operation, but also takes into account the original operating habits; maintenance is convenient and easy to find and eliminate faults; the equipment should have simple conditions, short fault inspection and repair cycle, few wearing parts that need to be replaced, and strong adaptability.

[0053] The transformation includes lower one-time investment and operating costs of equipment.

[0054] The utility model enables the diesel generator to start automatically through the self-starting module, thus solving the problems that the diesel generator takes a long time to start when backup energy is needed and is difficult to start when power is completely lost; the diesel generator system has relative independence, and the input condition is limited to the only condition that the electrical appliance loses voltage, and is not restricted by other external conditions; after the diesel engine starts automatically, the operating personnel can manually operate the remote closing module in the factory to connect the electrical appliance, and the reliability is strong; the system has a simple structure, requires few components, has a low installation cost, does not require additional software costs, and has a low maintenance cost.

[0055] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A backup diesel generator system, characterized in that: It includes a diesel generator, a remote closing module, a self-starting module, a manual starting module and an electrical appliance; the self-starting module is connected to the diesel generator, the manual starting module is connected to the diesel generator, the diesel generator is connected to the remote closing module, the remote closing module is connected to the electrical appliance, and the electrical appliance is connected to the self-starting module; the self-starting module includes a three-phase voltage relay, one side of the three-phase voltage relay is connected to the electrical appliance, and the other side is connected to the diesel generator.

2. A backup diesel generator system as claimed in claim 1, characterized in that: The diesel generator comprises a diesel generator body and a diesel generator control box, the manual starting module is connected to the diesel generator control box, the self-starting module is connected to the diesel generator control box, the diesel generator control box is connected to the diesel generator body, and the diesel generator body is connected to the remote closing module.

3. A backup diesel generator system as claimed in claim 1, characterized in that: The electrical appliance comprises a first electrical appliance and a second electrical appliance; the remote closing module is connected to the first electrical appliance and the second electrical appliance respectively.

4. A backup diesel generator system as claimed in claim 1, characterized in that: The remote closing module includes a first circuit breaker and a second circuit breaker; the first circuit breaker is connected to a first electrical appliance; one side of the second circuit breaker is connected to the first circuit breaker, and the other side is connected to the second electrical appliance.

5. A backup diesel generator system as claimed in claim 4, characterized in that: The first circuit breaker is an air circuit breaker, and the second circuit breaker is an air circuit breaker.

6. A backup diesel generator system as claimed in claim 1, characterized in that: The three-phase voltage relay is connected in series to the diesel generator control box via a normally closed contact.

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