Non-Directional Earth-Fault Protection Efxptoc; Positive-Sequence Overvoltage Protection Psptov; Positive-Sequence Undervoltage Protection Psptuv; Negative-Sequence Overvoltage Protection Nsptov - ABB RELION 630 Series Applications Manual

Section 3
REM630 variants
3.3.6.10
3.3.6.11
3.3.6.12
3.3.6.13
54

Non-directional earth-fault protection EFxPTOC

The non-directional earth-fault protection functions are used for protection under
earth-fault conditions with definite-time (DT) or with inverse definite minimum time
(IDMT) characteristic when appropriate.
The operation of the stage can be based on three measuring principles: DFT, RMS or
peak-to-peak values. The configuration includes high stage and low stage non-
directional current function blocks. The set of three phase currents, I3P, is connected
to the inputs. During the startup, for avoiding unnecessary operations, the start value
of both instances is multiplied by a setting parameter Start value Mult. Both instances
of the earth fault protection are blocked by the start of the instantaneous overcurrent
protection.
A common operate and start signal from high stage and low stage earth-fault
protection functions are connected to an OR-gate to form a combined non-directional
earth-fault operate and start signal which is used to provide a LED indication on the
LHMI. Separate start and operate signals from both of these functions are connected
to the disturbance recorder.

Positive-sequence overvoltage protection PSPTOV

The positive-sequence overvoltage function blocks are used for positive-sequence
overvoltage 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.

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.
1MRS756785 G
REM630
Application Manual