When installing the generator, ensure that the cooling air inlet is unobstructed, and that the hot air that is discharged should be avoided to enter the generator. If there are louvers on the venting cover, the window should face down to meet the protection level. The mechanical coupling of a single-bearing generator requires special attention to the uniform air gap between the stator and rotor.
The coupling between the alternator and the diesel generator requires that the parallelism and concentricity of the coupling are less than 0.05 mm. In actual use, the requirements may be slightly lower, about 0.1mm or less. If the bearing is too large, it will affect the normal operation of the bearing, resulting in damage. The coupling should be fixed by the positioning pin. Retest the coupling before installation.
The U, V, W, and N marks on the terminals of the generator outlet box do not indicate that the actual phase sequence depends on the direction of rotation. The certificate has UVW indicating the actual phase sequence when rotating clockwise, and VUW indicates the actual phase sequence when rotating counterclockwise.
When the generator of the sliding bearing is coupled, the height of the center of the generator should be adjusted slightly to the center of the diesel engine, so that the weight of the flywheel on the diesel engine will not be transferred to the generator bearing, otherwise the generator bearing will additionally bear the flywheel. The weight is not conducive to the formation of the oil film of the sliding bearing, resulting in heat generation and even burning of the bearing. The coupling of this type of generator cannot carry any heavy objects.
If the neutral points of the generators in the power supply system are connected to each other, or the neutral point of the generator is connected to the neutral point of the transformer and its load, the neutral line current will be output at the neutral line at the frequency of 3 times. Therefore, the neutral current of the generator must be measured for various load conditions that may occur during operation. In order to prevent the generator from overheating, the line current must not exceed 50% of the rated current of the generator. The mid-line power is too large, and a neutral reactor should be installed on the center line to limit it.
According to the schematic diagram or wiring diagram, select the appropriate power cable, use copper joints to connect, copper joints and busbars, after the busbars and busbars are fastened, the joint clearance at the joints is not more than 0.05mm, and the distance between the conductors is not more than 10mm, you need to install the necessary grounding wire.
