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Use And Maintenance Of Control Panel Of Diesel Generator Set

Mar. 06, 2023

The structure and installed equipment of the control panel (box) of diesel generator set are different, and their use methods and maintenance contents are also different. The use and maintenance of the control panel (box) will be briefly described with PF4-75 control box as an example.


(1) Use of control panel (box).

① Turn on the switch YK with the key and press the start button SB to start the diesel engine.


② Increase the speed of the diesel engine. When the speed of the diesel engine rises to close to the rated value, the generator can generate electricity by itself. The generator voltage can be adjusted by the setting potentiometer of excitation regulator TST1 (or TST2). When the diesel engine is running and the generator is not generating electricity, the deexcitation SA5 can be switched on.


diesel generator set

③ The three-phase voltage of the generator can be measured through the transfer switch SA1 and voltmeter V1.


④ The insulation condition of the generator can be monitored by the "insulation monitoring" lamp LH4~LH6, and the corresponding insulation monitoring lamp does not light up when a certain phase is short-circuited to the ground.


⑤ Turn on the automatic air switch, and the output (or closing) indicator HL1 is on, indicating that the unit has supplied power to the load.


⑥ The working condition of diesel engine is monitored by oil temperature gauge YW, oil pressure gauge JY, water temperature gauge SW, frequency meter Hz and charging ammeter A. The working condition of generator is determined by voltmeter V1, ammeter A, frequency meter Hz, power meter W, power factor meter cos φ Conduct monitoring.


When the generator is running alone, SA3 should be placed in the "stand-alone" position, the synchronization meter V2 switch SA9 should be placed in the "off" position, and the excitation regulator SA7 should be placed in the required position. When SA7 is placed in position "I", AVR1 is put into operation; When placed in position "II", AVR2 is put into operation. When it is placed in position "I+I", two excitation regulators control the operation of the generator in parallel, and each other acts as runaway overvoltage protection to ensure the reliability of the "single machine" operation of the unit.


⑧ When generators operate in parallel, SA3 should be placed in the "parallel" position, SA9 should be placed in the "on" position, and SA7 should be placed in the "I" or "II" position, but not in the "I+II" position, otherwise it will not play a control role in parallel operation.


⑨ Two generator units operating in parallel shall adjust their adjustable speed regulation setting positions respectively, so that the speed regulation rate of the units is - 3% (Class II power station) or - 5% (Class IV power station) under the rated active power. For diesel engines without adjustable speed regulation device, they should be matched and optimized to make their speed regulation rate as consistent as possible.


⑩ Two diesel generator sets operating in parallel shall set the differential resistance of reactive power regulator QT respectively, so that the voltage drop of the diesel generator set is - 3% (Class III power station) or - 5% (Class I power station) of the rated voltage under the rated load with the rated power factor of 0.8 lagging.


⑪ During parallel operation of generator units, the phase sequence, voltage and frequency must be consistent, and the operation shall be carried out according to the parallel operation method.


⑫ Load transfer after operation of generator set. When one generator and another (or several) generators operate in parallel, load transfer must be carried out. Active power transfer is to regulate the throttle of diesel engine. The larger the throttle, the more power it carries, and the smaller the throttle, the less power it carries. Reactive power transfer is to adjust the setting potentiometer in the excitation regulator to adjust the excitation current of the generator. The larger the excitation current, the greater the reactive power, and the smaller the excitation current, the smaller the reactive power. Load transfer is usually carried out in stages, that is, transfer part of active power first, and then transfer part of reactive power, and then transfer to balance step by step (that is, distribute evenly according to the proportion of rated power).


⑬ 3. Unit splitting operation. When the total load drops enough to make a unit split, the setting potentiometers of the diesel engine throttle and excitation regulator can be adjusted respectively to reduce the active power and reactive power to zero, and then split the unit.


(2) Maintenance of control panel (box).

① The control panel (box) must be kept dry, clean and well ventilated during use to prevent dust, water droplets, metal or other sundries from entering the box.


② Regular inspection and maintenance shall be carried out to check whether the contact of each part is good, whether the fastening screws are loose, whether the contact of each electrical device is in good condition, whether the insulation and heating of the coil are normal, and timely repair shall be carried out according to the existing problems.


③ If it has not been used for a long time, the insulation resistance of relevant electrical components should be measured before use. If it is found that the components are damp, they should be dried before use.


④ When a fault trip occurs, find out the cause of the fault, and check the relevant electrical components in the control panel (box). Only after the fault is eliminated can the switch be closed again.


Founded in 1974, Jiangsu Starlight Electricity Equipments Co.,Ltd., a wholly-owned subsidiary of Jiangsu Starlight Power Group, is one of the earliest manufacturers of generating sets in China. Over the past 40 years, the company has won the recognition of users by relying on advanced testing equipment, modern production technology, professional manufacturing technology, perfect quality management system, strong R&D technology strength. For more details, please contact us with sales@dieselgeneratortech.com.

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