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7SG163 Ohmega 300 Series SingleDEF
3 Relay Settings
3.1 DEF Auxiliary Protection S
ttings.
e
DEF Protection - Allows the DEF Element to be enabled or disabled
DEF Active Scheme - Active scheme may be set as either DEF POR or DEF Direct trip. For more details on these
schemes see part 2.1 of this section.
DEF Char Angle - Defines the maximum torque angle of the DEF element. The relay will operate in the region
within ±85º of this angle.
DEF Direction - May be set forward or reverse. Normally set to look in the forward direction.
DEF IDMTL Setting - Defines the current pickup setting of the DEF element.
DEF IDMTL Char - Defines the characteristic used for the IDMTL element.
The choices are as follows:
IEC-NI, VI, EI, LTI,
ANSI-MI, VI, EI
Definite Time Lag (DTL)
DEF IDMTL Time Mult (IEC/ANSI) - Defines a time multiplication factor to be applied to the standard curve.
DEF IDMTL Delay (DTL) - Sets the DTL delay if the IDMTL characteristic is selected as DTL.
DEF IDMTL Reset - Allows the reser time of the element to be defined as Instantaneous (INST), Decaying, or a
definite time (0-60s)
DEF CRG Res OV Setting -This sets the level of residual overvoltage which must be present for the Current
Reversal Guard Logic to be activated.
DEF Current Rev Reset - Time delay fo rwhis the relay will restrain following a reversal in current direction. (See
part 2.1 of this section)
CB Echo Pulse Width - If the local CB is open, and a signal is received from the remote end this is the length of
time for which the Signal Send 2 output will be energised for. (See part 2.1 of this section)
3.2 DEF Protection Status Inputs
Block DEF – Energising this Status Input will inhibit the operation of the DEF element.
Signal Received 2 – This is energised by the operation of the remote end instantaneous.
Carrier Guard – This is designed to be energised by the failure of the signalling channel (i.e. from a channel not
healthy contact on the signalling equipment). When energised it wil prevent a DEF aided trip. The relay will be
able to carry out a time delayed back-up trip.
3.3 DEF Protection Outputs
The DEF Protection output operates for any DEF Operation (aided or back-up), and the DEF Aided Trip output
will only operate for an aided DEF trip.
Signal Send 2 – This will pick-up when the relay is in DEF POR mode and an Overcurrent starter has operated.
©2010 Siemens Protection Devices Ltd
Chapter 12 Page 5 of 5
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