ABB RELION REX640 Technical Manual page 1095

Protection and control

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1MRS759142 F

blocks in this document. The configuration can be written to the protection relay

once the mismatch is corrected.

Operation principle

The function can be enabled and disabled with the

corresponding parameter values are "On" and "Off".

The operation of STTPMSU can be described with a module diagram. All the

modules in the diagram are explained in the next sections.

ST_EMERG_ENA

Figure 614: Functional module diagram

Startup supervisor

This module detects the starting of the motor. The starting and stalling motor

conditions are detected in four different modes of operation. This is done through

calculates the value of the thermal stress of the motor during the start-up

condition. In this mode, the start-up condition is detected by monitoring the TRMS

the value of the thermal stress when a start-up is monitored in addition to the

CB_CLOSED input.

In the "IIt & stall" mode, the function calculates the thermal stress of the motor

during the start-up condition. The start-up condition is detected by monitoring the

TRMS currents.

In the "IIt & stall, CB" mode, the function calculates the thermal stress of the motor

during the start-up condition but the start-up condition is detected by monitoring

the TRMS current as well as the circuit breaker status.

In both the "IIt & stall" and "IIt & stall, CB" mode, the function also checks for motor

stalling by monitoring the speed switch.

Technical Manual

Operation mode setting.

Operation mode setting is operated in the "IIt" mode, the function

Operation mode setting in the "IIt, CB" mode enables the function to calculate

Protection functions

Operation setting. The