ABB RELION REX640 Technical Manual page 842

Protection and control

Hide thumbs Also See for RELION REX640:

Table of Contents

Protection functions

Analog channel configuration

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

Table 769: 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 MNSPTOC can be described by using a module diagram. All the

modules in the diagram are explained in the next sections.

ST_EMERG_ENA

Figure 477: Functional module diagram

Level detector

The calculated negative-sequence current is compared to the

the measured value exceeds the

Once activated, the timer activates the START output. Depending on the value of

When the operation timer has reached the value set by

mode or the maximum value defined by the inverse time curve, the OPERATE output

is activated.

See the preprocessing function blocks in this document for the possible

signal sources.

Operating curve type , the time characteristics are according to DT or IDMT.

Three-phase currents

Start value setting, the function activates the timer

1MRS759142 F

Operation setting. The

Start value setting. If

Operate delay time in the DT

Technical Manual