ABB RELION REX640 Technical Manual page 1471

Protection and control

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1MRS759142 F

Function block

Figure 813: Function block

Functionality

The sequence current measurement function CSMSQI provides limit

value supervision outputs (I2_HIGH_AL, I2_HIGH_WARN, I1_HIGH_AL,

I1_HIGH_WARN, I1_LOW_WRN, I1_LOW_AL, I0_HIGH_AL, I0_HIGH_WARN).

Setting parameters

on delay time, Ng Seq A off delay time, Zro Seq A on delay time, Zro Seq A off

delay time are used for controlling the activation and the deactivation of alarm and

warning outputs.

Instantaneous sequence currents in amperes are available for application

configurations through outputs I2_INST, I1_INST and I0_INST.

Analog channel configuration

CSMSQI has one analog group input which must be properly configured.

Table 1414: 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.

Technical Manual

Ps Seq A on delay time, Ps Seq A off delay time, Ng Seq A

See the preprocessing function blocks in this document for the possible

signal sources.

Measurement functions

Three-phase currents