Technical requirements for diesel generator set fo

Technical requirements for special communication diesel generator sets

1 subject content and application

this standard specifies the technical requirements for type selection and inspection of special communication diesel generator sets (hereinafter referred to as units). This standard is applicable to units with power below 250KW. The rated frequency is 50Hz, the rated voltage is 400V, and the three-phase four wire system

2 reference standard

gb 2819 general technical conditions for AC power frequency mobile power stations

gb 5320 terminology for internal combustion engine power stations

3 technical requirements for ordinary units

3.1 diesel engine selection

3.1.1 diesel engine application is a model that has passed the formal appraisal

3.1.2 the diesel engine shall adopt the electric starting mode

3.1.3 the diesel engine with the speed of 1500r/min shall be selected

3.1.4 single cylinder diesel engine shall not be selected for prime mover

3.1.5 cooling water pre heating device should be adopted for water-cooled diesel engine

3.2 type selection of generator in the same step as automatic calculation of experimental results

3.2.1 brush excitation or brushless excitation type that can be selected for generator

3.2.2 the generator shall be equipped with resistance functional windings

3.2.3 the unsaturated short-circuit ratio of generator shall be greater than 0.4

3.3 technical requirements of the unit

3.3.1 the sinusoidal distortion rate of the wired voltage waveform of the unit at no-load rated voltage shall not be greater than 5%

3.3.2 the voltage and frequency adjustment rate, stability time and fluctuation rate of the unit at 95% ~ 100% rated voltage shall not exceed the provisions. However, for units with uncontrollable phase compound excitation device, the steady-state voltage regulation rate and voltage fluctuation rate are only assessed at rated voltage

3.3.3 the SCR of the unit shall not generate low-frequency oscillation when loaded

3.3.4 the fuel consumption rate of the unit under rated working conditions shall not be greater than the specified value

3.3.5 the oil consumption rate of the unit under rated working conditions shall not be greater than the specified value

3.3.6 for units with prime mover speed of 1500r/min, the mean time between failures shall not be less than 800H

note: ① mean time between failures refers to the ratio of the total working time of the unit to the number of failure downtime

② the number of normal maintenance stops as specified in the prime mover operation and maintenance manual shall not be counted

3.3.7 under normal temperature (5 ~ 35 ℃), the number of complete startup of the unit shall not exceed three times, and the total startup time shall not exceed 5min. After successful startup, it shall be able to run with rated load within 3min

3.3.8 the unit shall be subject to no-load or partial load running in for 60H before formal operation

3.3.9 this 2: the interface on the plug-in controller must be turned off. The contents not specified in the controller power supply standard shall comply with the provisions of class B power station in GB 2819

3.3.10 if there are special requirements for unit performance, it shall be discussed with the manufacturer when ordering

4 technical requirements for automatic units

4.1 the automatic unit shall meet the technical requirements for ordinary units

4.2 the unit shall be able to automatically maintain the state of automatic preparation for operation

the unit shall be able to automatically maintain the temperature of cooling water within the range of 15 ~ 50 ℃; The oil temperature is within the range of 15 ~ 30 ℃. For diesel engines that are allowed to start without pre heating, this regulation may not be followed. The unit shall be able to be prelubricated before startup. For diesel engines that are allowed to start without prelubrication, the provisions of this article may not be followed

4.3 automatic start and automatic loading of the unit

4.3.1 the unit shall be able to start automatically after receiving the start command of automatic control or remote control. The startup success rate shall be greater than 90%. One startup cycle includes three starts. The interval time t between two starts shall meet 0s. 4.3.2 after the unit is started successfully, it shall be able to load automatically. For the first time, the loading amount shall reach 50% of the rated load

4.3.3 in case of the third failure of automatic startup of the unit, if there is a standby unit, the program control system shall be able to automatically transmit the startup command to the standby unit

4.4 automatic unloading and shutdown of the unit

the unit shall be able to unload and shutdown automatically after receiving the automatic control or remote control shutdown command, and its shutdown mode shall be normal shutdown and emergency shutdown

normal shutdown steps: cut off the main circuit and run without load for 5min, and cut off the fuel circuit

emergency shutdown steps: immediately cut off the main circuit, fuel circuit and air inlet circuit

4.5 automatic voltage regulation and frequency modulation of the unit

the unit shall be able to automatically adjust the output voltage and frequency. The adjustment rate, stabilization time and fluctuation rate of voltage and frequency shall comply with the provisions of 3.3.2

4.6 automatic protection of the unit

the unit shall be protected against low oil pressure, high cooling water temperature, overvoltage, overspeed, short circuit, phase loss, etc

4.7 automatic supply of units

automatic supply of units is divided into three categories

1 type automatic replenishment device is used for level 1 automatic unit. The automatic replenishment of fuel oil, oil and cooling water shall meet the continuous (or cumulative) operation of the unit for 4H under unattended conditions

class 2 automatic replenishment device is used for Level 2 automatic unit. The automatic replenishment of fuel, oil and cooling water shall meet the continuous (or cumulative) operation of the unit for 240h under unattended conditions

category 3 automatic replenishment device is used for Level 3 automatic unit. The automatic replenishment of fuel oil, engine oil and cooling water shall meet the continuous (or cumulative) operation of the unit for 1000h under unattended conditions

4.8 the starting battery shall be kept at full capacity when the unit is working or not

4.9 MTBF of each unit

mtbf of level 1 automatic unit shall be greater than 500h

the mean time between failures of level 2 automatic units shall be greater than 800H

the mean time between failures of level 3 automatic units should be greater than 1000. The experiment has high reproducibility H

4.10 other technical requirements of the unit

4.10.1 the automatic unit shall be capable of both automatic control and remote control and local manual operation

4.10.2 protection devices for undervoltage, low speed (or low frequency), excessive oil temperature, etc. can be selected as required

4.10.3 the unit shall have automatic timing function

5 inspection items and technical requirements

5.1 delivery test items and technical requirements:

1 measuring the steady-state adjustment rate of voltage and frequency this standard 3.3.2

2 cooling water and oil heating of automatic units this standard 3.3.1

3 protection performance of automatic units (low oil pressure, high cooling water temperature, overspeed, overvoltage, overload, phase loss) automatic power-off shutdown

4 automatic compensation of automatic units