Generators

.1 Introduction

Installation of generators involves coupling of rotating machines and hence requires high degree ofengineering skill and competence, both mechanical and electrical. In order to ensure long and satisfactory life, it is necessary that the machine foundations have adequate strength, there is perfect alignment between the prime mover and the alternator and that the vibration of the machines are within permissible limits. The generator shall be installed in a cool, well ventilated place devoid of moisture, oil, dust, grease, carbon and metallic dust. It shall not be mounted in an atmosphere containing inflammable gases, corrosive acid fumes or other injurious gases unless specially made for such applications. Installation of the generator and the prime mover calls for a wide range of mechanical tests and measurements. Such tests covering the mechanical characteristics of the generator and prime mover are not included in this book. During the pre-commission checks and tests, each component of the generator installation is checked for proper installation and correct assembly. The electrical connections are verified for conformity with the approved diagram at every stage of the installation. Pre-commission tests of generators include testing of the protective devices and relays, auxilliary equipments and control circuitry. The following paragraphs explain the pre-commission checks and tests to be conducted on generator installations.

4.2 Precommission checks

General Checks

· Inspect the Generating Station/Generator room and premises for conformity with the approved site plan.

· Verify the inside layout of the Generating station/Generator room for conformity with the approved scheme.

· Check whether the building/buildings are of fire proof construction

.Check the physical layout of the generator, prime mover, control panels, auxiliary equipments etc. for conformity with the approved plan. Measure the alround clearances of equipments and control...