Settings For Steps 1 And 4 - ABB REL650 Applications Manual

1MRK 506 334-UUS A
7.6.3.1
Application manual
SeqTypeIPol: It is used to select type of current polarization quantity, i.e. ZeroSeq and
NegSeq for direction detection.
SeqTypeIDir: It is used to select type of operating quantity, i.e. ZeroSeq and NegSeq for
direction detection.
Operation: Sets the protection to Enabled or Disabled.
EnaDir: Enables the directional calculation in addition to the directional mode selection
in each step.

Settings for steps 1 and 4

n means step 1 and 4. x means step 1, 2, 3 and 4.
DirModeSelx: The directional mode of step x. Possible settings are Disabled/Non-
directional/Forward/Reverse.
Characteristn: Selection of time characteristic for step n. Definite time delay and different
types of inverse time characteristics are available.
Inverse time characteristic enables fast fault clearance of high current faults at the same
time as selectivity to other inverse time phase overcurrent protections can be assured. This
is mainly used in radial fed networks but can also be used in meshed networks. In meshed
networks the settings must be based on network fault calculations.
To assure selectivity between different protections, in the radial network, there have to be
a minimum time difference Dt between the time delays of two protections. The minimum
time difference can be determined for different cases. To determine the shortest possible
time difference, the operation time of protections, breaker opening time and protection
resetting time must be known. These time delays can vary significantly between different
protective equipment. The following time delays can be estimated:
Protection operate time:
Protection resetting time:
Breaker opening time:
The different characteristics are described in the Technical Manual (TM).
tx: Definite time delay for step x. The definite time tx is added to the inverse time when
inverse time characteristic is selected.
Pickup"x": Operate residual current level for step x given in % of IBase.
15-60 ms
15-60 ms
20-120 ms
Section 7
Current protection
205