GE T60 Instruction Manual page 455

5 SETTINGS
An RRTD short condition is detected when actual RRTD temperature is less than –40°C and RRTD short is displayed
as is "–50°C". in the T60.
• RRTD 1 APPLICATION: This setting allows each remote RTD to be assigned to a group application. This is useful for
applications that require group measurement for voting. A value of "None" specifies that the remote RTD will operate
individually and not part of any RTD group. All remote RTDs programmed to "Stator" are used for RTD biasing of the
T60 thermal model. Common groups are provided for rotating machines applications such as ambient, bearing, group
1, or group 2. If the
REMOTE RTD 1 TRIP VOTING
from the same group also pick up, where N is the number of enabled RTDs from the group.
• RRTD 1 ALARM TEMPERATURE: This setting specifies the temperature pickup level for the alarm stage. The range
of 1 to 200°C differs from the existing RTD settings to correspond to the range of the RRTD unit.
• RRTD 1 ALARM PKP DELAY: This setting specifies time delay for the alarm stage until the output can be asserted.
The range of 5 to 600 seconds differs from the existing RTD settings to correspond to the range of the RRTD unit.
• RRTD 1 TRIP TEMPERATURE: This setting specifies the temperature pickup level for the trip stage. The range of 1 to
200°C differs from the existing RTD settings to correspond to the range of the RRTD unit.
• RRTD 1 TRIP PKP DELAY: This setting specifies time delay for the trip stage until the output can be asserted. The
range of 5 to 600 seconds differs from the existing RTD settings to correspond to the range of the RRTD unit.
• RRTD 1 TRIP RST DELAY: This setting specifies the reset delay to seal-in the trip signal.
• RRTD 1 TRIP VOTING: This setting allows securing trip signal by voting with other RTDs. A value of "None" indicates
that element operates individually and no voting takes place.
A value of "Group" indicates that element is allowed to issue a trip if N – 1 of other RTDs of the same group pick up as
well (where N is the number of enabled RTDs from the group). For example, if three RTDs are assigned to the same
group, there should be at least one additional RTD of the same group picked up to issue a trip command.
The "Remote RTD 1" through "Remote RTD 12" values indicate that element is allowed to issue a trip if the corre-
sponding peer RTD is also picked up.
• RRTD 1 OPEN: This setting allows monitoring an open remote RTD sensor circuit. If this functionality is not required,
then a value of "None" will disable monitoring and assertion of output operands.
If set to "Alarm", the monitor will set an alarm when a broken sensor is detected.
If set to "Block", the monitor will set an alarm and simultaneously block remote RTD operation when a broken sensor is
detected.
If targets are enabled, a message will appear on the display identifying the broken RTD. If this feature is used, it is rec-
ommended that the alarm be programmed as latched so that intermittent RTDs are detected and corrective action may
be taken.
• RRTD 1 BLOCK: This setting is used to block remote RTD operation.
GE Multilin
setting value is "Group", then it is allowed to issue a trip if N – 1 RTDs
T60 Transformer Protection System
5.9 TRANSDUCER INPUTS AND OUTPUTS
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