Introduction to Technical Requirements for Bidding of Diesel Generator Sets

Signing sales contracts with enterprises through platform bidding is an important way for diesel generator manufacturers to reach cooperation with enterprises. Different units may have different requirements for diesel generator set bidders, but the basic technical requirements are the same. Yes, below, Dingbo Power will introduce the technical requirements for bidding for diesel generator sets.

Diesel generator sets

 

       Signing sales contracts with enterprises through platform bidding is an important way for diesel generator manufacturers to reach cooperation with enterprises. Different units may have different requirements for diesel generator set bidders, but the basic technical requirements are the same. Yes, below, Dingbo Power will introduce the technical requirements for bidding for diesel generator sets.

 

       1. Basic requirements

       1. The alternator should be a synchronous AC motor with brushless excitation.

       2. The insulation of the alternator should be Class F insulation and Class B temperature rise. Within the allowable temperature rise limit, it can run for 1h at 110% rated load with a cycle of 12h.

       3. The alternator should be able to withstand overspeed operation 20% higher than the synchronous value.

       4. The protection level of the junction box at the outlet of the generator set should be IP42, and the signs on the outlet side of the junction box should be L1, L2, L3, N, and the phase sequence should be marked with a color code.

       5. The unit should be equipped with a 220V single-phase anti-condensation heater, which should be put into operation when the equipment is shut down. This heater should be connected to a separate junction box.

       6. The battery equipped with the unit should be equipped with a metal casing, the protection level is IP30, and the incoming line isolation switch should be set in the battery box. It is required to use a valve-regulated lead-acid battery, which can be float-charged through the external power supply AC220V.

       7. The total harmonic content of the output voltage waveform should not exceed 4%, the deviation coefficient should not exceed 10%, and the radio interference factor (TIF) should not exceed 50.

       8. The comprehensive efficiency of generator set, exciter and governor should not be lower than 94% under rated load and 0.8 power factor.

       9. Under steady-state conditions, the voltage regulation should be within 0.5% of the rated voltage, and the voltage fluctuation should not exceed 20% and should be restored to 5% within 1 second when the full load is suddenly loaded and unloaded.

       10. The diesel generator set has its own control cabinet.

       11. The diesel generator is equipped with an independently installed fuel tank. The fuel tank reserve is considered based on the 8-hour fuel consumption of the diesel generator. The size of the oil storage room is 2 meters X 2.4 meters. The installation of the fuel tank and the installation of the fuel line from the fuel tank to the diesel generator shall be included.

 

       The control and protection

       1. In case of minor failure of the unit (such as high cooling water temperature, high oil temperature, low oil pressure, overload, 3 start failures, low starting battery capacity, etc.), an audible and visual alarm is issued, and manual parking is allowed.

       2. When a serious failure of the unit occurs (such as too high cooling water temperature, too high oil temperature, too low oil pressure, overspeed, too low or too high voltage, etc.), and the engine is in a predetermined dangerous stage, it should stop immediately, and make a sound, Light alarm signal.

       3. The low oil level switch in the daily fuel tank will issue an alarm signal when the content of the fuel tank drops to 20% and 50%; if conditions permit, it can realize automatic oil filling.

       4. When the generator is over-current, the power supply bus is short-circuited, the phase is broken, the voltage is too high, and the voltage is lost, it will automatically trip immediately, and an audible and visual alarm will be issued. Equipped with electronic speed control device and overspeed trip structure, when the overspeed is 15%, the fuel will be cut off.

       5. The unit should have the function of fault self-diagnosis.

       6. If the unit has parallel requirements, the control panel should have automatic parallel function. And the parallel unit is equipped with reverse power protection.

       7. Speed ​​adjustment: under various load conditions, there should be a device for manually adjusting the speed, and the adjustment range is ±5%.

       8. All sound and light alarm signals and release switches should be connected to the control panel, and the display signals include: unit speed, oil pressure, water temperature, DC voltage, working hours, generator line voltage, phase voltage, phase current, phase, frequency, Power factor, active power, reactive power, apparent power, electrical degree, load rate.

       9. Remote control: emergency stop, remote start/stop group.

       10. Remote signaling: working mode (automatic/manual), emergency stop, overvoltage, undervoltage, single-phase and three-phase overcurrent, low oil pressure, high water temperature, high/low frequency (speed), start failure, start battery Low voltage, low oil level alarm, mains interruption, unit work, unit failure, charging rectifier failure, etc.

       11. Telemetry: three-phase voltage, three-phase current, output power, output frequency (speed), water temperature, oil pressure, starting battery voltage.

       12. Short-circuit withstand capability: The generator set should be able to withstand the short-circuit current of 3s when the output terminal is short-circuited without damage.

 

       3. Structural requirements

       1. Stationary or mobile diesel generators should use equipment with excellent performance, and should not use the method of increasing the speed to achieve the specified output power.

       2. The generator set should be modularized and adopt fast self-starting technology, and its engine design, equipment and control should meet the specifications of heavy-duty stationary and continuous full/heavy-load process application units.

       3. The unit must not have water leakage, oil leakage and air leakage.

       4. The fuel consumption of the unit under rated conditions should not exceed 250g/(kWh), and the consumption of the unit should not exceed 4g/(kWh). The unit should be able to use domestic fuel and oil without affecting the output power and service life of the unit. , the manufacturer should provide usable and most suitable oil grade and its winter antifreeze measures.