GE T60 Instruction Manual page 598

TRANSDUCER INPUTS/OUTPUTS
RRTD 1 APPLICATION
applications that require group measurement for voting. A value of "None" specifies that the remote RTD operates
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
same group also pick up, where N is the number of enabled RTDs from the group.
RRTD 1 ALARM TEMPERATURE
200°C differs from the existing RTD settings to correspond to the range of the RRTD unit.
RRTD 1 ALARM PKP DELAY
of 5 to 600 seconds differs from the existing RTD settings to correspond to the range of the RRTD unit.
RRTD 1 TRIP TEMPERATURE
differs from the existing RTD settings to correspond to the range of the RRTD unit.
RRTD 1 TRIP PKP DELAY
to 600 seconds differs from the existing RTD settings to correspond to the range of the RRTD unit.
RRTD 1 TRIP RST DELAY
RRTD 1 TRIP VOTING
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
needs to 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 corresponding
peer RTD is also picked up.
5
— This setting allows monitoring an open remote RTD sensor circuit. If this functionality is not required, then a
RRTD 1 OPEN
value of "None" disables monitoring and assertion of output operands. If set to "Alarm", the monitor sets an alarm when a
broken sensor is detected. If set to "Block", the monitor sets an alarm and simultaneously block remote RTD operation
when a broken sensor is detected.
If targets are enabled, a message appears on the display identifying the broken RTD. If this feature is used, it is
recommended that the alarm be programmed as latched so that intermittent RTDs are detected and corrective action can
be taken.
— This setting is used to block remote RTD operation.
RRTD 1 BLOCK
5-380
— This setting allows each remote RTD to be assigned to a group application. This is useful for
setting value is "Group", then it is allowed to issue a trip if N – 1 RTDs from the
— This setting specifies the temperature pickup level for the alarm stage. The range of 1 to
— This setting specifies time delay for the alarm stage until the output can be asserted. The range
— This setting specifies the temperature pickup level for the trip stage. The range of 1 to 200°C
— This setting specifies time delay for the trip stage until the output can be asserted. The range of 5
— This setting specifies the reset delay to seal-in the trip signal.
— This setting allows securing trip signal by voting with other RTDs. A value of "None" indicates that
Figure 5-225: Remote RTD input protection logic
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS