HIGH VOLTAGE INSULATION
The ECO46-49 MV-HV generators feature the latest technology, developed in collaboration with Von Roll, a global leader in insulating materials and processes used in state-of-the-art high-voltage generators.
The Mecc Alte High Voltage insulation system is based on class H epoxy resin, low viscosity, without any VOC (volatile organic compound), in combination with glass and Mica tapes.
Our technology is REACH compliant and has many advantages versus the previous technologies such as:
- Outstanding behavior after ageing at high temperature. Thermal index 191.8°C according to functional tests IEC 60034-18-31 / IEEE 1776
- Excellent flexibility and mechanical properties
- Good thermal conductivity
- Good electrical properties
- Approved from American Petroleum Institute (API) for harsh environmental application
HV INSULATION: FUNCTIONAL SYSTEM TESTS
The Mecc Alte High Voltage insulation system has been tested and approved according to the strictest norms IEC 60034-18-31 / IEEE 1776. The test consists in an aging thermal cycle followed by a test series of:
- Mechanical vibration
- Storage in high humidity condition
- Insulation resistance and high voltage test of turn insulation and main wall insulation
HV INSULATION FUNCTIONAL SYSTEM TESTS: RESULTS
Two words about the theory:
After the breakdown of each specimen the lifetimes can be obtained.
Lifetimes over temperature generate the lifetime diagram, which is used to obtain the temperature index of the insulation system. The thermal index corresponds to the temperature which might cause the breakdown after 20.000h
The system reached a thermal index of 191.8°C because the laboratory decided to interrupt the test at 200°C after 10.000h.
We have got no breakdown after 10.000h at 200°C
VIBRATION ANALYSIS, OPERATIONAL DEFLECTION SHAPES & MODE SHAPES
VERIFICATION OF ANALYTICAL MODELLING
In the process of designing an alternator for genset application, it is essential to carry out some structural vibration analysis as well.
Most often this is done by performing ODS (Operating Deflection Shape Analysis) or Modal Analysis.
An ODS shows the deformation of a structure at a specific frequency and shows the response of a structure to both resonant and forced vibration, and is generally very representative of real world data.
Modal analysis is similar to ODS in that deformation of the structure can be viewed, but it is primarily concerned with resonance frequencies (or natural frequencies) of a structure.
The goal of this project is to confirm the mechanical design of the Mecc Alte series ECO49, and setup a foundation method for the new series ECO47.
- The project is composed of the following stages:
- Acquiring the ODS’s in a real genset MTU 20V4000G63 / Mecc Alte ECO 49MV-L
- Simulate the ECO 49MV-L with a FEM software in order to model the modal parameters: natural frequencies, modal damping and shape.
- Create a simplified virtual model of the engine, by means of a curve fitting process
- Create a virtual test bench where simulate the alternator with different engines