ABB RELION REX640 Technical Manual page 384

Protection and control

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Protection functions

Table 433: Analog inputs

Improper analog channel configuration causes a validation error if the analog

channels are not completely configured or they do not match with certain settings.

For troubleshooting, check the contents of this chapter and also the preprocessing

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 T1PTTR can be described using a module diagram. All the modules

in the diagram are explained in the next sections.

The function uses ambient temperature which can be measured locally or remotely.

Local measurement is done by the protection relay. Remote measurement uses

analog GOOSE to connect AMB_TEMP input.

Figure 227: Functional module diagram

Max current selector

The max current selector of the function continuously checks the highest measured

TRMS phase current value. The selector reports the highest value to the temperature

Temperature estimator

The final temperature rise is calculated from the highest of the three-phase currents

according to the expression:

See the preprocessing function blocks in this document for the possible

signal sources.

If the quality of remotely measured temperature is invalid or

communication channel fails the function uses ambient temperature set

Env temperature Set .

Three-phase currents

1MRS759142 F

Operation setting. The

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