ABB RELION REX640 Technical Manual page 895

Protection and control

Hide thumbs Also See for RELION REX640:

Table of Contents

1MRS759142 F

Excitation level M =

The situation and the data are according to Example 1. In this case, the

manufacturer of the machine allows the continuous operation at 105 percent

of the nominal voltage at the rated load and this value to be used as the

base for overexcitation.

machine is calculated with the equation.

Excitation level M =

In this case, the function operation is according to IDMT. The

curve type setting is selected as "OvExt IDMT Crv2". The corresponding

example settings for the IDMT curve operation are given as:

Technical Manual

Usually, the U/f characteristics are specified so that

the ratio is 1.00 at the nominal voltage and nominal

frequency. Therefore, the value 100 percent for the setting

Voltage Max Cont is recommended.

Voltage Max Cont setting is 105 percent, the excitation level M of the

Voltage Max Cont = 100%, Time multiplier = 4, Maximum operate time

Minimum operate time = 1 s and Cooling time = 200 s.

Protection functions

(Equation 253)

(Equation 254)

Start value =