Positive-Sequence Undervoltage Protection Psptuv; Negative-Sequence Overvoltage Protection Nsptov - ABB RELION 630 Series Applications Manual

Section 3
REM630 variants
3.2.6.11
3.2.6.12
36

Positive-sequence undervoltage protection PSPTUV

The positive-sequence undervoltage function blocks are used for positive-sequence
undervoltage protection with definite-time characteristic. The set of three phase
voltages, U3P, is connected to the inputs.
The operate and start signals from the positive-sequence overvoltage function is used
to trigger the disturbance recorder. The undervoltage function is blocked by the fuse
failure function and during starting condition of the motor.

Negative-sequence overvoltage protection NSPTOV

The negative sequence overvoltage function blocks are used for negative-sequence
overvoltage protection with definite-time characteristic. The set of three phase
voltages, U3P, is connected to the inputs.
The operate and start signals are used to provide a LED indication on the LHMI and
they are also connected to the disturbance recorder.
GUID-63612F53-F1C1-48E1-B940-DA878C64479A V1 EN
Figure 12: Negative-sequence overvoltage protection
1MRS756785 G
REM630
Application Manual