4.151
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
RTD Location
The relay allows you to independently define the location of each monitored
RTD by using the RTD location settings. Define the RTD location settings
through use of the following suggestions:
➤
If an RTD is not connected to an input or has failed in place and
will not be replaced, set the RTD location for that input equal to
OFF.
➤
For RTDs embedded in generator stator windings, set the RTD
location equal to WDG.
➤
For inputs connected to RTDs measuring bearing race
temperature, set the RTD location equal to BRG.
➤
For the input connected to an RTD measuring ambient motor
cooling air temperature, set the RTD location equal to AMB.
Only one ambient temperature RTD is allowed.
➤
For inputs connected to monitor temperatures of apparatus, such
as transformer oil and winding temperature, set the RTD
location equal to OTH. Use the RTD identifier setting to assign
an appropriate name to the RTD. For example, set
RTD1NAM := XFRMR1 OIL.
If an RTD location setting is equal to OFF, the relay does not request that an
RTD type setting be entered for that input.
RTD Type
The four available RTD types are:
➤
100-ohm platinum (PT100)
➤
100-ohm nickel (NI100)
➤
120-ohm nickel (NI120)
➤
10-ohm copper (CU10)
RTD Trip/Warning Levels
The SEL-700G provides temperature warnings and trips through use of the
RTD temperature measurements and the warning and trip temperature
settings, shown in Table 4.45.
The relay issues a winding temperature warning if any of the healthy winding
RTDs (RTD location setting equals WDG) indicate a temperature greater than
the relay RTD warning temperature setting. The relay issues a winding
RTD1 TRIP LEVEL
OFF, 1–250 degC
TRTMP1 := OFF
RTD1 WARN LEVEL
OFF, 1–250 degC
ALTMP1 := OFF
•
•
•
•
•
•
•
•
•
WIND TRIP VOTING
Y, N
EWDGV := N
BEAR TRIP VOTING
Y, N
EBRGV := N
a
The RTD Identifier setting is available only when associated RTD Location is set to OTH.
Table 4.45
RTD Settings
(Sheet 2 of 2)
Setting Prompt
Setting Range
Setting Name :=
Factory Default
NOTE:
To improve the security, RTD
ALARM and TRIP are delayed by
approximately 6 seconds.
Summary of Contents for SEL-700G Series
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