1. The basis for the purchase of diesel generator sets 1. The performance and quality of the selected diesel generator sets must comply with relevant standards. Diesel generators are widely used in telecommunications, financial and financial sectors, schools, commercial and other sectors, industrial and mining enterprises and residential buildings. The emergency backup power supply, military and field operations, vehicles and ships and other special-purpose independent power supply.
As a diesel generator set for communications, it must meet the requirements specified in G28 or G4 of GB2820-1997, and comply with the 24 performance indicators specified in the “Detailed Rules for the Inspection of the Access Network Quality of Diesel Generator Sets for Communicationsâ€, and must be passed at the same time. The rigorous inspection of the communication power equipment quality supervision and inspection center set up by the industry authority in China.
As a diesel generator set for military communications, it is necessary to meet the requirements of GB2820-1997, GJB related standards, and the “Quality Inspection Standards for Communications Power Equipment†formulated by the relevant military departments, and to pass the strict inspection of the relevant organization departments on the quality of equipment.
2. The main factors that should be considered in the selection of diesel generator sets The factors that should be taken into consideration when selecting a generator set are the mechanical and electrical properties, the use of the generator set, the capacity and range of the load, and the automation functions.
(1) The purpose of the unit. Because the diesel generator set can be used in three situations: common, standby and emergency. Therefore, there are differences in the requirements for different types of diesel generator sets. (2) Load capacity. The load capacity and load variation range should be selected according to different applications to determine the single capacity of the diesel generator set and the capacity of the standby diesel generator set. (3) Environmental conditions of the unit (mainly altitude and climatic conditions)
(4) Selection of diesel generators (5) Selection of generators and excitation methods (6) Selection of the diesel generator's automation function II. Implementation of diesel network generators for standard communication diesel generators The 24 performance indicators specified in the Detailed Rules:
1. Appearance requirements (1) The diesel generator set's boundary dimensions, installation dimensions and connection dimensions are in line with the provisions of the program approval of the plant product drawings (2) the unit should be welded firmly, the weld should be uniform, no welding wear, undercut, clip Defects such as slag and pores, welding slag flux should be removed; paint film should be uniform, no obvious cracks and shedding; coating should be smooth, no spots, rust, etc.; unit fasteners should not be loose. (3) The electrical installation of the diesel generator shall be in accordance with the circuit diagram. The joints of the conductors of the unit shall have obvious marks that are not easy to fall off. (4) Diesel generators should have well-grounded terminals.
(5) The complete contents of the diesel generator's signage 2. Insulation resistance and dielectric strength (1) Insulation resistance: The insulation resistance of each independent electrical circuit to the ground and the loop should be greater than 2M
(2) Insulation strength: Each independent electrical circuit of the unit shall be capable of withstanding the AC test voltage for 1 min between the ground and the circuit. There shall be no breakdown or flickering.
Loop voltage test voltage <100V750V≥100V1440V
3. Phase sequence requirements. The phase sequence of the terminals of the diesel generator control panel should be sorted from left to right or top to bottom when viewed from the front of the control panel.
4. The diesel generator maintains ready-to-run status requirements. The unit shall have a heating device to ensure that the oil temperature and the cooling medium temperature during emergency start-up and rapid loading are not less than 15°C.
5. Automatically start the reliability check of the power supply and automatic shutdown (1) After the automatic or remote control start command, the diesel power generation should be able to start automatically.
(2) When the unit fails for the third time after it has started automatically, a start failure signal shall be issued. When the standby unit is provided, the program start system shall be able to automatically transfer the start command to another standby unit. (3) The time from the automatic start command to power supply to the load should not exceed 3 minutes. (4) After the diesel generator has been automatically started, the first load should not be less than 50 nominal load.
(5) After receiving the automatic or remote stop command, the unit shall be able to stop automatically; for the standby unit used with the mains power grid, the diesel generator shall be able to switch automatically or stop automatically when the power grid returns to normal, and the shutdown mode is delayed. The time should comply with the product specifications.
6, automatic start success rate. The automatic startup success rate is not less than 99.
7, no-load voltage setting range requirements. The no-load voltage setting range of the unit is not less than 95-105 calibration voltage.
8, automatic replenishment function requirements. The unit should be able to automatically charge the start battery.
9, automatic protection function requirements. The unit should have phase loss, short circuit (not more than 250KW), overcurrent (not more than 250KW), overspeed, high temperature of the water temperature cylinder, and low oil pressure protection.
10, line voltage waveform sine distortion rate. At no-load calibration voltage and calibration frequency, the sinusoidal distortion rate of the line voltage waveform is less than 5.
11, voltage steady-state adjustment rate ≤ 250KW> 250KW32
12, voltage transient adjustment rate ≤ 250KW> 250KW2015
13, voltage stability time ≤ 250KW> 250KW ≤ 2s ≤ 1.5s
14, voltage fluctuation rate ≤ 250kw> 250kw0.80.5
15. Frequency steady-state adjustment rate ≤250kw>250kw33
16, frequency transient adjustment rate ≤ 250kw> 250kw99
17, frequency stability time ≤ 250kw> 250kw5s ≤ 5s
18, frequency fluctuation rate ≤ 250kw> 250kw ≤ 0.8 ≤ 0.5
19. Voltage deviation under three-phase asymmetrical load The diesel generator set shall be capable of normal operation with a rated load of 25 phased resistive loads in either phase under the symmetrical load of 25, and the line voltage shall have a maximum or minimum value. 5 with the average of the three-wire voltage.
20. Noise noise sound pressure at 1m away from the unit diesel engine and generator:
≤250KW>250KW≤102db(A)≤108db(A)
Noise standard:
The ambient noise of a residential area with <45db sleep should not exceed 50 dB during the day, and should be less than 45 (40) dBH at night and the work should be <65db. Normal people can maintain normal response and attention with a sound of about 40 dB, but at 50 dB Working in the above environment, a long time will lead to hearing loss, emotional irritability, and even neurasthenia.
Listening to music 80db children living in a noise environment of more than 80 decibels, resulting in up to 50 deaf and mute, noise level only 80 decibels below, in order to maintain 40 years of long-term work without deafness; at 100 decibels, only 60% will not deaf. If people live in an environment of more than 80 decibels for a long time, they will cause emotional irritability and hearing loss. The noise has a damaging effect on the human central nervous system and can induce cardiovascular diseases. Eating in a strong noisy environment, the gastrointestinal capillaries contract, and the secretion of digestive juices and gastrointestinal motility will weaken, making normal The blood supply is damaged. Strong noise can also cause abnormal pregnancy and mental retardation in children. Therefore, in daily life, we must minimize the source and spread of noise.
Less than 85 decibels can cause mild hearing loss; 85 decibels - 90 decibels can cause a few noise deafness; 90-100 decibels can cause a certain amount of noise deafness; more than 100 decibels, it will cause a considerable number of noise deafness, above These are chronic nociceptive deafness. More than 105 decibels --- 5 minutes of schizophrenia 21, fuel consumption rate. The rated power of the unit is 12022, diesel generator consumption rate. Unit rated power >40KW, unit consumption rate ≤3.0G/KW.H
23. Operation of the test set under the specified working conditions Under the specified working conditions (Section 4.2 of GB2820), the set can normally run for 12 hours (including overload 10 runs for 1 hour) under the calibration conditions, and the diesel generator set should be free of charge. Leakage and air leakage.
24. Remote control, remote signaling and telemetry performance (1) Units above 200KW of intelligent units should be intelligent. The monitoring content and interface requirements are as follows:
1 Remote control: On/off, emergency stop, and switching between main and standby units.
2 Remote communication: working status (operation/stop), working mode (automatic/manual), main unit, overvoltage, undervoltage, overcurrent, frequency 3 telemetry: three-phase output voltage, three-phase output battery voltage, output power.
4 interface: should have communication interface (RS-232 and RS-485/422) and can provide a complete communication protocol.
(2) Non-intelligent units 200KW and below non-intelligent units have no remote control, remote signaling and telemetry requirements.
Third, the choice of emergency diesel generators Emergency diesel generators are mainly used in important places, in the event of an emergency or power outage after an instant power outage, through the emergency generator set to quickly restore and extend the power supply time. This kind of power load is called a primary load. Equipment, meters, and computer systems that have strict requirements on power-off time shall be provided with batteries or UPS power supplies in addition to generators.
The emergency diesel generator has two features:
The first feature is for emergency use. Continuous work does not last long. Generally, it only requires a few hours of continuous operation (≤12H).
The second feature is for standby. The emergency generator set is normally in a waiting state. Only when all the main power supplies are switched off and on, the emergency diesel generator set starts to run to provide an emergency electricity load. When the main power supply returns to normal, it is switched immediately. Stopped.
(1) Determination of capacity of emergency diesel generator generator The rated capacity of the emergency diesel generator set is the atmospherically corrected 12h nominal capacity, which should be capable of meeting the total emergency load calculation load and satisfy the first-order load according to the generator capacity. The requirements for starting a single-capacity motor in a single unit are verified. Emergency generators generally use three-phase AC synchronous generators with a calibrated output voltage of 400V
(2) Determination of the number of emergency diesel generator sets When there are multiple generator sets in standby, only one emergency diesel generator set is generally set. In consideration of reliability, two sets of generator sets can also be used in parallel to supply power. The number of generator sets for emergency use should not exceed 3 in general. When multiple units are selected, the unit should try to use complete sets of equipment with the same type and capacity as those with the same pressure regulation and speed control characteristics. The fuel used should have the same properties so that maintenance and spare parts can be shared. When there are 2 generator sets for emergency use, the self-starting device should make the 2 sets of units stand by each other. That is, after the power failure of the mains power supply is delayed and confirmed after a delay, the first set of units will be self-started 3 times. If it fails to start, it should send an alarm signal and automatically start the second diesel generator.
(3) Selection of Emergency Diesel Generators Emergency generators should use diesel generator sets with high speed, boost pressure, low fuel consumption, and the same capacity. The high-speed supercharged diesel engine has a larger single unit capacity and occupies a small space; the diesel engine is equipped with an electronic or hydraulic speed-regulating device, and the speed regulation performance is good; the generator should use a synchronous motor equipped with a brushless excitation or a compound excitation device for reliable and faulty operation. Low rate, convenient maintenance and inspection; when the capacity of a single air conditioner or the motor capacity is large in the first-order load, the third harmonic excitation generator unit should be selected; the machine is assembled on a common chassis with a shock absorber; Pipe outlets should be equipped with mufflers to reduce the noise impact on the surrounding environment.
(4) Emergency diesel generator set control The emergency generator sets shall have quick self-start and automatic input devices. When the power failure of the main power supply is cut off, the emergency unit should be capable of quick self-starting and restoration of power supply. The allowable power-off time of the first-order load is from ten seconds to several tens of seconds. It should be determined according to the specific circumstances. When the main power supply of the important project is cut off, the first 3-5s must be determined to avoid the momentary voltage reduction and the closing time of the city grid or the standby power supply. Then the command to start the emergency generator is issued. . It will take a while for the command to be issued, the unit to start, and the speed to be full. Generally, large and medium-sized diesel engines also need pre-lubrication and warm-up processes, so that the oil pressure, oil temperature, and cooling water temperature during emergency loading are in compliance with the specifications of the plant's technical conditions; pre-lubrication and warm-up processes can be performed in advance according to different conditions. For example, emergency communications such as military communications, major foreign affairs in large hotels, large-scale mass events in public buildings at night, and major surgical operations should be pre-lubricated and warmed up, so that they can be quickly started at any time, minimizing failures and power failures. time.
After the emergency unit is put into operation, in order to reduce the mechanical and current impact during sudden load, it is better to increase the emergency load at intervals according to the power supply requirements. According to the national standards and national standards, the first allowable load of the self-starting unit is as follows: For the rated power not more than 250KW, the first allowable load is not less than 50 calibration load; for the calibration power greater than 250KW, according to the factory Technical specifications. If the transient voltage drop and transient process requirements are not strict, the sudden increase or sudden load of the general unit should not exceed 70 of the rated capacity of the unit.
Fourth, the choice of commonly used diesel generators Some diesel generators in a certain period of time or often takes a long time to carry out as a common power supply power supply, such generator set as a common generator set. Common generator sets can be used as common and standby units. Townships, islands, forest farms, mines, oil fields and other industries or industrial and mining enterprises that are far from the major power grids need to install diesel generators in order to supply local residents with plants and livelihoods. Such generator sets should be carried out without interruption.
Important facilities such as national defense projects, communications hubs, radio stations, and microwave relay stations should be provided with backup diesel generator sets. The level of such facilities can be supplied by the mains electricity network. However, due to earthquakes, typhoons, wars, and other natural disasters or human factors, after the power grid has been damaged and the power is cut off, the standby units that have been set up should be started quickly and persist for a long time to ensure the use of electricity for these important projects. The continuous supply of the load, this type of standby generator is also a common generator type. The common generator set has a long continuous working time, and the load curve changes greatly. The unit capacity, number of units, type selection, and unit control mode are different from the emergency unit.
1. Determination of the capacity of commonly-used diesel generators According to the long-term continuous operation of the generator, the output power can meet the maximum calculation load of the whole project, and the capacity of the generator set standby unit should be determined according to the importance of the load. The continuous output power of a diesel engine is generally 0.9 times the calibrated power.
2. Determination of the number of commonly-used diesel generating sets The number of commonly used diesel generating sets is usually set to two or more to ensure the continuity of the power supply and to adapt to changes in the power load curve. With a large number of units, it is possible to determine the number of units to be put into a generator set based on changes in the power load, so that the diesel engine is often operated under economic load to reduce the fuel consumption rate and reduce the cost of power generation. The best economical operating state of a diesel engine is between 75-90 of the rated power. In order to guarantee the continuity of power supply, the common unit itself should consider setting up a standby unit. When troubleshooting the unit or stopping the inspection, the generator set can still meet the uninterrupted continuous power supply to the important power load.
3. Determination of the speed of commonly used diesel generator sets In order to reduce wear and increase the service life of the unit, commonly used generator sets should use mid- and low-speed generators whose rated speed is not more than 1000r/min. The standby set can select medium and high-speed units. Units of the same power station should use the same type and capacity of the same unit in order to use the same spare parts to facilitate maintenance and management. For projects with large load changes, the same series of units with different capacities can also be used. The generator output calibration voltage is the same as that of the emergency generator set, which is generally 400V. Individual power consumption is large, and high-voltage generator sets can be used for projects with long transmission distances.
4. Commonly used diesel generator sets for general control should be considered in parallel to be able to be carried out in parallel to simplify the distribution of the main wiring, the unit start, stop rotation operation, through the car, transfer the load, switch the unit without interrupting the power supply. The unit shall be equipped with an organic group of measurement and control devices. The unit's speed regulation and excitation adjustment device shall be applied to the requirements for the parallel implementation of fish. For standby generators supplying important loads, automatic diesel generators should be selected to be able to start automatically and power supply to important loads after a power failure. When the diesel engine runs, the noise in the engine room is very large, and the automation unit is easy to transform into a generator unit with compartment operation and automatic monitoring. When the generator set is in normal operation, the operator does not have to enter the diesel engine room, and the diesel generator set can be monitored in the control room.
V. Order requirements for diesel generator sets After making all the above selections, orders for diesel generator sets should generally indicate the following:
(1) Unit model, rated power, rated frequency, rated voltage, rated current, number of phases, power factor and wiring method. (2) Requirements for the automation function and performance of the unit.
(3) Requirements for the structure, performance and installation dimensions of diesel engines, generators and control panels.
(4) Parallel operation requirements for the unit: if more than one unit is purchased at the same time, whether parallel operation is required or not, if parallel connection is required, it is also required to provide whether or not measurement instruments and devices required for parallel operation are provided. (5) Auxiliary equipment requirements for the unit: Many domestic manufacturers also regarded the cooling water tank (radiator), fuel tank, exhaust muffler, battery, etc. as ancillary equipment, and allowed certain requirements for installation during ordering.
As a diesel generator set for communications, it must meet the requirements specified in G28 or G4 of GB2820-1997, and comply with the 24 performance indicators specified in the “Detailed Rules for the Inspection of the Access Network Quality of Diesel Generator Sets for Communicationsâ€, and must be passed at the same time. The rigorous inspection of the communication power equipment quality supervision and inspection center set up by the industry authority in China.
As a diesel generator set for military communications, it is necessary to meet the requirements of GB2820-1997, GJB related standards, and the “Quality Inspection Standards for Communications Power Equipment†formulated by the relevant military departments, and to pass the strict inspection of the relevant organization departments on the quality of equipment.
2. The main factors that should be considered in the selection of diesel generator sets The factors that should be taken into consideration when selecting a generator set are the mechanical and electrical properties, the use of the generator set, the capacity and range of the load, and the automation functions.
(1) The purpose of the unit. Because the diesel generator set can be used in three situations: common, standby and emergency. Therefore, there are differences in the requirements for different types of diesel generator sets. (2) Load capacity. The load capacity and load variation range should be selected according to different applications to determine the single capacity of the diesel generator set and the capacity of the standby diesel generator set. (3) Environmental conditions of the unit (mainly altitude and climatic conditions)
(4) Selection of diesel generators (5) Selection of generators and excitation methods (6) Selection of the diesel generator's automation function II. Implementation of diesel network generators for standard communication diesel generators The 24 performance indicators specified in the Detailed Rules:
1. Appearance requirements (1) The diesel generator set's boundary dimensions, installation dimensions and connection dimensions are in line with the provisions of the program approval of the plant product drawings (2) the unit should be welded firmly, the weld should be uniform, no welding wear, undercut, clip Defects such as slag and pores, welding slag flux should be removed; paint film should be uniform, no obvious cracks and shedding; coating should be smooth, no spots, rust, etc.; unit fasteners should not be loose. (3) The electrical installation of the diesel generator shall be in accordance with the circuit diagram. The joints of the conductors of the unit shall have obvious marks that are not easy to fall off. (4) Diesel generators should have well-grounded terminals.
(5) The complete contents of the diesel generator's signage 2. Insulation resistance and dielectric strength (1) Insulation resistance: The insulation resistance of each independent electrical circuit to the ground and the loop should be greater than 2M
(2) Insulation strength: Each independent electrical circuit of the unit shall be capable of withstanding the AC test voltage for 1 min between the ground and the circuit. There shall be no breakdown or flickering.
Loop voltage test voltage <100V750V≥100V1440V
3. Phase sequence requirements. The phase sequence of the terminals of the diesel generator control panel should be sorted from left to right or top to bottom when viewed from the front of the control panel.
4. The diesel generator maintains ready-to-run status requirements. The unit shall have a heating device to ensure that the oil temperature and the cooling medium temperature during emergency start-up and rapid loading are not less than 15°C.
5. Automatically start the reliability check of the power supply and automatic shutdown (1) After the automatic or remote control start command, the diesel power generation should be able to start automatically.
(2) When the unit fails for the third time after it has started automatically, a start failure signal shall be issued. When the standby unit is provided, the program start system shall be able to automatically transfer the start command to another standby unit. (3) The time from the automatic start command to power supply to the load should not exceed 3 minutes. (4) After the diesel generator has been automatically started, the first load should not be less than 50 nominal load.
(5) After receiving the automatic or remote stop command, the unit shall be able to stop automatically; for the standby unit used with the mains power grid, the diesel generator shall be able to switch automatically or stop automatically when the power grid returns to normal, and the shutdown mode is delayed. The time should comply with the product specifications.
6, automatic start success rate. The automatic startup success rate is not less than 99.
7, no-load voltage setting range requirements. The no-load voltage setting range of the unit is not less than 95-105 calibration voltage.
8, automatic replenishment function requirements. The unit should be able to automatically charge the start battery.
9, automatic protection function requirements. The unit should have phase loss, short circuit (not more than 250KW), overcurrent (not more than 250KW), overspeed, high temperature of the water temperature cylinder, and low oil pressure protection.
10, line voltage waveform sine distortion rate. At no-load calibration voltage and calibration frequency, the sinusoidal distortion rate of the line voltage waveform is less than 5.
11, voltage steady-state adjustment rate ≤ 250KW> 250KW32
12, voltage transient adjustment rate ≤ 250KW> 250KW2015
13, voltage stability time ≤ 250KW> 250KW ≤ 2s ≤ 1.5s
14, voltage fluctuation rate ≤ 250kw> 250kw0.80.5
15. Frequency steady-state adjustment rate ≤250kw>250kw33
16, frequency transient adjustment rate ≤ 250kw> 250kw99
17, frequency stability time ≤ 250kw> 250kw5s ≤ 5s
18, frequency fluctuation rate ≤ 250kw> 250kw ≤ 0.8 ≤ 0.5
19. Voltage deviation under three-phase asymmetrical load The diesel generator set shall be capable of normal operation with a rated load of 25 phased resistive loads in either phase under the symmetrical load of 25, and the line voltage shall have a maximum or minimum value. 5 with the average of the three-wire voltage.
20. Noise noise sound pressure at 1m away from the unit diesel engine and generator:
≤250KW>250KW≤102db(A)≤108db(A)
Noise standard:
The ambient noise of a residential area with <45db sleep should not exceed 50 dB during the day, and should be less than 45 (40) dBH at night and the work should be <65db. Normal people can maintain normal response and attention with a sound of about 40 dB, but at 50 dB Working in the above environment, a long time will lead to hearing loss, emotional irritability, and even neurasthenia.
Listening to music 80db children living in a noise environment of more than 80 decibels, resulting in up to 50 deaf and mute, noise level only 80 decibels below, in order to maintain 40 years of long-term work without deafness; at 100 decibels, only 60% will not deaf. If people live in an environment of more than 80 decibels for a long time, they will cause emotional irritability and hearing loss. The noise has a damaging effect on the human central nervous system and can induce cardiovascular diseases. Eating in a strong noisy environment, the gastrointestinal capillaries contract, and the secretion of digestive juices and gastrointestinal motility will weaken, making normal The blood supply is damaged. Strong noise can also cause abnormal pregnancy and mental retardation in children. Therefore, in daily life, we must minimize the source and spread of noise.
Less than 85 decibels can cause mild hearing loss; 85 decibels - 90 decibels can cause a few noise deafness; 90-100 decibels can cause a certain amount of noise deafness; more than 100 decibels, it will cause a considerable number of noise deafness, above These are chronic nociceptive deafness. More than 105 decibels --- 5 minutes of schizophrenia 21, fuel consumption rate. The rated power of the unit is 12022, diesel generator consumption rate. Unit rated power >40KW, unit consumption rate ≤3.0G/KW.H
23. Operation of the test set under the specified working conditions Under the specified working conditions (Section 4.2 of GB2820), the set can normally run for 12 hours (including overload 10 runs for 1 hour) under the calibration conditions, and the diesel generator set should be free of charge. Leakage and air leakage.
24. Remote control, remote signaling and telemetry performance (1) Units above 200KW of intelligent units should be intelligent. The monitoring content and interface requirements are as follows:
1 Remote control: On/off, emergency stop, and switching between main and standby units.
2 Remote communication: working status (operation/stop), working mode (automatic/manual), main unit, overvoltage, undervoltage, overcurrent, frequency 3 telemetry: three-phase output voltage, three-phase output battery voltage, output power.
4 interface: should have communication interface (RS-232 and RS-485/422) and can provide a complete communication protocol.
(2) Non-intelligent units 200KW and below non-intelligent units have no remote control, remote signaling and telemetry requirements.
Third, the choice of emergency diesel generators Emergency diesel generators are mainly used in important places, in the event of an emergency or power outage after an instant power outage, through the emergency generator set to quickly restore and extend the power supply time. This kind of power load is called a primary load. Equipment, meters, and computer systems that have strict requirements on power-off time shall be provided with batteries or UPS power supplies in addition to generators.
The emergency diesel generator has two features:
The first feature is for emergency use. Continuous work does not last long. Generally, it only requires a few hours of continuous operation (≤12H).
The second feature is for standby. The emergency generator set is normally in a waiting state. Only when all the main power supplies are switched off and on, the emergency diesel generator set starts to run to provide an emergency electricity load. When the main power supply returns to normal, it is switched immediately. Stopped.
(1) Determination of capacity of emergency diesel generator generator The rated capacity of the emergency diesel generator set is the atmospherically corrected 12h nominal capacity, which should be capable of meeting the total emergency load calculation load and satisfy the first-order load according to the generator capacity. The requirements for starting a single-capacity motor in a single unit are verified. Emergency generators generally use three-phase AC synchronous generators with a calibrated output voltage of 400V
(2) Determination of the number of emergency diesel generator sets When there are multiple generator sets in standby, only one emergency diesel generator set is generally set. In consideration of reliability, two sets of generator sets can also be used in parallel to supply power. The number of generator sets for emergency use should not exceed 3 in general. When multiple units are selected, the unit should try to use complete sets of equipment with the same type and capacity as those with the same pressure regulation and speed control characteristics. The fuel used should have the same properties so that maintenance and spare parts can be shared. When there are 2 generator sets for emergency use, the self-starting device should make the 2 sets of units stand by each other. That is, after the power failure of the mains power supply is delayed and confirmed after a delay, the first set of units will be self-started 3 times. If it fails to start, it should send an alarm signal and automatically start the second diesel generator.
(3) Selection of Emergency Diesel Generators Emergency generators should use diesel generator sets with high speed, boost pressure, low fuel consumption, and the same capacity. The high-speed supercharged diesel engine has a larger single unit capacity and occupies a small space; the diesel engine is equipped with an electronic or hydraulic speed-regulating device, and the speed regulation performance is good; the generator should use a synchronous motor equipped with a brushless excitation or a compound excitation device for reliable and faulty operation. Low rate, convenient maintenance and inspection; when the capacity of a single air conditioner or the motor capacity is large in the first-order load, the third harmonic excitation generator unit should be selected; the machine is assembled on a common chassis with a shock absorber; Pipe outlets should be equipped with mufflers to reduce the noise impact on the surrounding environment.
(4) Emergency diesel generator set control The emergency generator sets shall have quick self-start and automatic input devices. When the power failure of the main power supply is cut off, the emergency unit should be capable of quick self-starting and restoration of power supply. The allowable power-off time of the first-order load is from ten seconds to several tens of seconds. It should be determined according to the specific circumstances. When the main power supply of the important project is cut off, the first 3-5s must be determined to avoid the momentary voltage reduction and the closing time of the city grid or the standby power supply. Then the command to start the emergency generator is issued. . It will take a while for the command to be issued, the unit to start, and the speed to be full. Generally, large and medium-sized diesel engines also need pre-lubrication and warm-up processes, so that the oil pressure, oil temperature, and cooling water temperature during emergency loading are in compliance with the specifications of the plant's technical conditions; pre-lubrication and warm-up processes can be performed in advance according to different conditions. For example, emergency communications such as military communications, major foreign affairs in large hotels, large-scale mass events in public buildings at night, and major surgical operations should be pre-lubricated and warmed up, so that they can be quickly started at any time, minimizing failures and power failures. time.
After the emergency unit is put into operation, in order to reduce the mechanical and current impact during sudden load, it is better to increase the emergency load at intervals according to the power supply requirements. According to the national standards and national standards, the first allowable load of the self-starting unit is as follows: For the rated power not more than 250KW, the first allowable load is not less than 50 calibration load; for the calibration power greater than 250KW, according to the factory Technical specifications. If the transient voltage drop and transient process requirements are not strict, the sudden increase or sudden load of the general unit should not exceed 70 of the rated capacity of the unit.
Fourth, the choice of commonly used diesel generators Some diesel generators in a certain period of time or often takes a long time to carry out as a common power supply power supply, such generator set as a common generator set. Common generator sets can be used as common and standby units. Townships, islands, forest farms, mines, oil fields and other industries or industrial and mining enterprises that are far from the major power grids need to install diesel generators in order to supply local residents with plants and livelihoods. Such generator sets should be carried out without interruption.
Important facilities such as national defense projects, communications hubs, radio stations, and microwave relay stations should be provided with backup diesel generator sets. The level of such facilities can be supplied by the mains electricity network. However, due to earthquakes, typhoons, wars, and other natural disasters or human factors, after the power grid has been damaged and the power is cut off, the standby units that have been set up should be started quickly and persist for a long time to ensure the use of electricity for these important projects. The continuous supply of the load, this type of standby generator is also a common generator type. The common generator set has a long continuous working time, and the load curve changes greatly. The unit capacity, number of units, type selection, and unit control mode are different from the emergency unit.
1. Determination of the capacity of commonly-used diesel generators According to the long-term continuous operation of the generator, the output power can meet the maximum calculation load of the whole project, and the capacity of the generator set standby unit should be determined according to the importance of the load. The continuous output power of a diesel engine is generally 0.9 times the calibrated power.
2. Determination of the number of commonly-used diesel generating sets The number of commonly used diesel generating sets is usually set to two or more to ensure the continuity of the power supply and to adapt to changes in the power load curve. With a large number of units, it is possible to determine the number of units to be put into a generator set based on changes in the power load, so that the diesel engine is often operated under economic load to reduce the fuel consumption rate and reduce the cost of power generation. The best economical operating state of a diesel engine is between 75-90 of the rated power. In order to guarantee the continuity of power supply, the common unit itself should consider setting up a standby unit. When troubleshooting the unit or stopping the inspection, the generator set can still meet the uninterrupted continuous power supply to the important power load.
3. Determination of the speed of commonly used diesel generator sets In order to reduce wear and increase the service life of the unit, commonly used generator sets should use mid- and low-speed generators whose rated speed is not more than 1000r/min. The standby set can select medium and high-speed units. Units of the same power station should use the same type and capacity of the same unit in order to use the same spare parts to facilitate maintenance and management. For projects with large load changes, the same series of units with different capacities can also be used. The generator output calibration voltage is the same as that of the emergency generator set, which is generally 400V. Individual power consumption is large, and high-voltage generator sets can be used for projects with long transmission distances.
4. Commonly used diesel generator sets for general control should be considered in parallel to be able to be carried out in parallel to simplify the distribution of the main wiring, the unit start, stop rotation operation, through the car, transfer the load, switch the unit without interrupting the power supply. The unit shall be equipped with an organic group of measurement and control devices. The unit's speed regulation and excitation adjustment device shall be applied to the requirements for the parallel implementation of fish. For standby generators supplying important loads, automatic diesel generators should be selected to be able to start automatically and power supply to important loads after a power failure. When the diesel engine runs, the noise in the engine room is very large, and the automation unit is easy to transform into a generator unit with compartment operation and automatic monitoring. When the generator set is in normal operation, the operator does not have to enter the diesel engine room, and the diesel generator set can be monitored in the control room.
V. Order requirements for diesel generator sets After making all the above selections, orders for diesel generator sets should generally indicate the following:
(1) Unit model, rated power, rated frequency, rated voltage, rated current, number of phases, power factor and wiring method. (2) Requirements for the automation function and performance of the unit.
(3) Requirements for the structure, performance and installation dimensions of diesel engines, generators and control panels.
(4) Parallel operation requirements for the unit: if more than one unit is purchased at the same time, whether parallel operation is required or not, if parallel connection is required, it is also required to provide whether or not measurement instruments and devices required for parallel operation are provided. (5) Auxiliary equipment requirements for the unit: Many domestic manufacturers also regarded the cooling water tank (radiator), fuel tank, exhaust muffler, battery, etc. as ancillary equipment, and allowed certain requirements for installation during ordering.
LED grow lights are relatively new to the cannabis growing scene,but they have become wildly popular over the last few years with their ability to produce great yields while staying cool and using a reasonable amount of electricity.
Choose LED grow lights if...
You want to use the most cutting-edge indoor cannabis grow lights with a customized spectrum of light
You are willing to do some research to determine the best LED Grow Light for your space
You have some extra money to spend on your initial setup (some of the best LED grow lights are expensive!)
Quality (potency, smell, trichome development) is more important to you than yields/watt.
You don't want to deal with an exhaust system or ducting,and would prefer to just hang your grow light over your cannabis plants and let the lights cool themselves
Features
Deep penetration :Good lighting penetration,can penetrate to the deep of the plants
Modular Internal Build: Fully upgradable,easy warranties
Thermal Management:Custom copper core heatsinks quickly dissipates heat for cool operating temperatures
Powerful: 2nd Generation ultra penetration 5W LEDs light deep into the canopy
Versatile: Power cord available in 85~265V and international plugs
Lighter weight: Much lighter than the same products in the marketplace, safer for hanging .
Plants: Suitable for both vegetative phrase and flowering phrase
Product Images
The Plug you can choose
PAR Value of our 2000W LED Grow Lights
Applications
Our professional full spectrum COB LED Grow Light are suitable for all the indoor plants and good for seeding, growth,flowering and fruiting stages of plants, increasing the harvest and Saving energy.
Our Ageing Test
Package
Cautions:
1.Do not use the lights in dripping water or anywhere where they will get wet, water and electricity can be a dangerous mixture
2. The working environment for the light is -20~40 degree celsius,45%RH~90%RH.
3. To protect the light, Plz cut off the power when there is a lightning strike.
4. Don`t touch or move when the light working.
Suggestions:
1.Clean the dust inside every 6 months to ensure the good heat dissipation and long life time.
2.Don`t keep too short distance to the plant canopy to avert leaves bleaching.
3.Highly hang the lamp will weaken the energy and affect the growth cycle of the plants, so the lamp should not be hang too high.
4.While taking care of the plants, please spray the leaves and branches 2-3 times everyday, to ensure the plants do not wrinkle a wither, and have no phenomenon of few fruit, and hard pericarp.
Philizon have over 6 years' experience in designing and manufacturing led grow lights and LED Aquarium Light. Persuiting to offer the best LED grow lights for plants growth,we cooperate with the scientific research institutes and the Academies of Agricultural Sciences in USA, Australia Canada, UK and so on.A great number of commercial plant growers test the lights, and their feedbacks show that this lamp owns a lot of 640nm,660nm and 740nm lights, which gives the plants enough nutrient in the flowering and fruiting phase and bring a far higher yield than other led grow lights in the market.
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Shenzhen Phlizon Technology Co.,Ltd. , https://www.szledaquariumlight.com