Impedance

Overview

The aim of this section is to compute the inter-bar impedance of the damper.

In the section on impedance, two solutions are proposed to compute the end-ring impedance:

None: Automatic mode.
Constant: A user mode where it is possible to set the different values of resistance and inductances.

Table 1. End-ring – Impedance – Two modes of definition are available

1	Default setting: Automatic way for computing the end-ring impedance. It is based on internal computation processes.
2	Button to select a user mode for defining the different values of resistance and inductances

Automatic

When automatic computation mode is set, inter-bar end-ring impedances are computed by internal processes, being a function of the temperature at the end-ring (at Connection Side and Opposite Connection Side), and the material of the end-ring.

Constant computation mode

When constant computation mode is set, the inter-bar end-ring resistance and inductance values must be set by the user. The values are given for a reference temperature. In this case the inter-bar end-ring resistances and inductances depend on the temperature and materials of the end-ring.

Table 2. End-ring – Constant computation mode

1	Reference temperatures for both sides of the machine
2 - 2.1	Inter-bar impedance characteristics to be defined on both sides of the machine.
3 - 3.1	Inter-pole impedance characteristics to be defined on both sides of the machine.

Note: On one pole, the distances between bars may differ from one another. In that case one only considers average value in the automatic mode as well as in user mode (Constant).