Our Services

Upgrading of generators

To upgrade generators, we offer electromagnetic redesign to achieve this increase in power, thanks to the new technology in insulation systems, their thickness has been reduced, leaving more space for copper to grow inside the slot, which allows for greater circulation of current, coupled with a modification of the lamination within what is allowed by the physical dimensions of the machine, with this it is possible to increase the generation capacity of the generators and their useful life.

Rotor Rehabilitation

In flat pole rotors, GENERMEX offers the removal and placement of retaining rings, cleaning and superficial rehabilitation of coil heads, changing spacers, and in case the retaining rings are damaged or in case of If required by our client, GENERMEX offers the supply and installation of retaining rings, fans and couplings or special rotor parts.

In salient pole rotors, GENERMEX offers pole reinsulation and manufacture, if necessary, supply of pole coil separating “V”; blocks.

In both types of rotors, GENERMEX offers the execution of electrical, mechanical, non-destructive tests to the exposed parts of the rotor, as well as the execution of minor works such as polishing of slip rings and journals, rectification of lubrication or seal labyrinths, and the replacement of components such as slip rings, diodes, power lines to the field and dynamic balancing at low speed in banks and at high speed in tunnels.

Stator Rewinding

The rewinding of electric generator stators consists of the removal of the depleted or failed winding and the installation of a new winding.

The design of the new generator coils includes the application of new materials in such a way that, if the original design allows it, the electric generator can get a greater capacity or works cooler and so extends its useful life expectancy.

Generators cores

In case of major damage to stator cores, GENERMEX offers the supply and installation of lamination packages or complete cores, to replace packages or cores damaged by electrical or mechanical failure. This includes internal laminations, external laminations with welded “I”; bars, pinch fingers, pressure plates and any other components that are necessary to restore or improve the original clamping, tightening and magnetic characteristics of the core.

GENERMEX offers the continuous stacking technique in core rehabilitation, since this technique allows a better operation of the core avoiding undulations and hot spots in it.

Maintenance of electric generators

GENERMEX offer different types of maintenance for electric generators according to the needs of our clients, understanding that timely maintenance prevents failures in Electric Generators, most failures in an electric generator occur due to operating conditions or to environmental conditions and occur in a transitory process, the mechanical and electrical stresses to which it is subjected are greater, scheduled and constant maintenance is required for electrical generators.

Within the maintenance of electrical generators offered are the following:

Cleaning.
Change of wedges, separators, and clamping rings.
Removal, evaluation, replacement, rearrangement and assembly of coils in stator windings.
Application of paints and tapes of semiconductor material to rehabilitate electric field graduation systems in generators.
Change of insulation and, if necessary, of coils and field windings in rotors with non-salient and salient poles.
Minor superficial repairs in stator cores.
Modification of insulation design to increase the efficiency and, if possible, the power of electric generator

Diagnosis of Generator Windings

Of all the techniques used to determine the condition of a rotating electrical machine, none is as revealing as a thorough visual inspection by experienced personnel. GENERMEX has extensive experience and specialized personnel to perform visual inspections on generators.

To diagnose the condition of parts and assemblies of a generator, it is necessary to complement the visual observations and the operating experiences, with results of the following electrical and mechanical tests, all offered by GENERMEX.

Electrical tests

Insulation resistance
Polarization index
Ohmic resistance to windings
Power factor and “Tip-Up” to windings
Partial discharges to windings
Impedance to rotors
Voltage balance to rotor poles
Detection of hot spots in stator laminations

The test known as “ELCID” (Electromagnetic Core Imperfection Detection) allows us to evaluate the state of the interlaminar insulation of the stator core. This test uses little energy and is very effective.

If necessary, it is possible to perform a test that requires high energy and is known as a toroid.

Training

We offer a Course on Electric Power Generators, oriented towards the maintenance of electric generators. This Course is divided into Modules, each of which can be taught in one or more sessions, depending on the needs and possibilities of the personnel concerned.

This Course seeks to identify and assimilate the technological knowledge associated with the electric generators that our clients operate and maintain. This to help them improve their continuity, reliability, security and cost rates.

The content of the Course can be synthesized into four specialty areas:

Design and Construction of Electric Generators
Efforts in its parts and materials, derived from the particular characteristics of its actual operation.
Electrical Testing and Acceptance Values
Proven actions to extend the useful life of electric generators