03-09-2012, 04:39 PM
TESTING OF TURBOGENERATORS
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ABSTRACT
Testing is the most important process to be conducted on a machine after it is designed. The testing of machine is necessary primarily to establish that the machine performance complies with the customer specifications. Tests ensure that the piece of equipment concerned is suitable for and capable for performing duty for which it is intended. Testing is done under condition simulating as closely as possible as possible to those which will apply when the set is finally installed with a view to demonstrate to purchaser’s representative its satisfactory operation. Test provides the experimental data like efficiency, losses, characteristics, temperature limits, etc. for the use of design office, both as conformation of design forecast and also as basic information for the production of future designs.
With ever increasing rating of the modern turbo generators and reliability of service expected, testing at manufacturer’s works has become of paramount importance. The machine performance is evaluated from the results of the equivalent tests.
Testing Provides data for optimization of design, Provides quality assurance, Meets the requirement of legal and contract requirements, Reduction in rework cost, Ensures process capability and develops checklist, increases confidence levels in manufacture, Helps in building of safety and general O and M manual, Establishes control over raw materials.
Tests on turbo generators are classified under the following headings, which is also the order in which these are performed during the course of manufacture.
1. Tests on the materials and components during the manufacture so as to control the quality of the materials in process also known as Process tests.
2. Performance tests on the machine to prove the performance of the generator in accordance with the required standard.
Examination of the rotor forgings, Rotor coil binding ring tests, Hydraulic test on stator casing, Stator core flux test, Rotor winding and cell insulation test, Tests on stator coils, Balancing and over speeding of rotor are the tests during manufacture/process tests.