4.2.2 Not applicable
4.2.3 Not applicable
4.2.4 Vibrations
The vibration measurement must be taken on each bearing
in the three directions. The measured levels must be lower
than the specified values indicated in the chapter 2.1.3.4
Adjust the sensor as per chapter 2.1.3.4
4.3 START-UP SEQUENCE
The generator start up (commissioning) must follow the
following sequences:
4.3.1 Static checks
Machine fixing as per chapter 4.2
Alignment as per chapter 3.3
Cooling as per chapter 4.2.0.2 & 4.2.3
Bearing lubrication as per chapter 4.2.2
Electrical connections as per chapter 4.1.2
Winding insulation as per chapter 5.10
4.3.2 Rotating checks
4.3.2.0 Rotor speed rate of rise (Standard unit)
There is no restriction regarding the rate of rise of the rotor
spin up from stop to nominal speed
There is no restriction regarding the load rate of rise
4.3.2.1 Rotating checks not excited
Run the generator without excitation by steps to verify the
bearings temperature as per chapter 2.5.1 or 2.6.2
At the nominal speed (not excited) measure the vibrations.
Check that the vibration level is in accordance with the
generator duty (as per chapter 2.1.3.4).
4.3.2.2 Rotating checks at no load excited
In AVR manual mode; Voltage adjustment; check the
excitation current value (refer to Section 4 for the AVR
manual and to Section 2 for the generator test report)
In AVR automatic mode; Voltage adjustments; Voltage
range; check the excitation current value value (refer to
Section 4 for the AVR manual and to Section 2 for the
generator test report)
At the nominal speed (excited) measure the vibrations.
Check that the vibration level is in accordance with the
generator duty (as per chapter 2.1.3.4).
4.3.2.3 Generator and site safety parameters
Proceed to the site safeties adjustment (over voltage relay,
over current relay, differential protection; negative
sequence relay...). The setting points are not in Leroy
Somer scope of supply.
The settings must comply with the generator data sheet
(eg: capability curve; thermal damage curve …)
Check the synchronizer setting following chapter 4.1.3.3
For any operation at a speed exceeding the nominal range
(generally the main fre3%) the generator
excitation must be shut off (refer to the electrical
schematics)
4.3.2.4 Rotating checks at full load
Operating In parallel with the mains
Adjust the Power Factor
Load the generator step by step. :
Check the excitation current at 25%of the rated load
Check the excitation current at 100%of the rated load
Electric Power Generation
Installation and maintenance
5654
en - 2017.
10
/
a
LSA 5
2
.2
MHV
Industrial Range Alternators
- 4 pole
17
