ABB RELION REX640 Technical Manual page 438

Protection and control

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Protection functions

Figure 251: Rogowski coil measurement arrangement

It is also possible to feed shaft current, measured with CT, directly to the relay

current input. Proper signal levels need to be ensured for reaching acceptable

operation accuracy.

The current level that causes damage to bearings depends on the contact surface of

the bearings. Current densities over 0.1 A/mm

can be generalized so, that currents over 1 A can be considered harmful. Therefore,

the recommended setting for

0.25 A. Both values are set in primary amperes.

GSLPTOC Input signals

Table 496: GSLPTOC Input signals

GSLPTOC Output signals

Table 497: GSLPTOC Output signals

Integrator box

Alarm start value and Operate start value

start to damage the bearings. This

Operate start value is 0.5 A and for Alarm start value

1MRS759142 F

Protection relay

Analog input

Block signal for all bi-

nary outputs

Technical Manual