701 Motor Protection Relay Date Code 20010719
Settings Calculation
RTD-Based Protection
4.30
RTD-Based Protection
When you purchase the SEL-701 Relay with optional RTD inputs, or connect the
SEL-2600 RTD Module, the relay offers several protection and monitoring functions
whose settings are described below.
RTD Configuration Settings
Table 4.22 RTD C onfiguration Se tti ngs
The SEL-701 Relay can monitor temperature using RTD inputs in one
of two ways:
Optional internal RTD inputs.
An SEL-2600 RTD Module.
When RTDs will not be connected to the relay or to an external module, set the
RTD Input Option setting equal to NONE. When RTDs will be connected to internal
RTD inputs, set the RTD Input Option setting equal to INT. When monitored RTDs
will be connected to the inputs of the external module, set the RTD Input Option setting
equal to EXT.
NOTE: SEL-701 Relays equipped with internal RTD inputs may
be connected to monitor the RTD inputs of an SEL-2600 RTD
Module. The relay will monitor only those inputs enabled by
the RTD Input Option setting. It will not monitor both input
sets simultaneously.
The Temperature Preference Setting allows you to configure the RTD temperature
trip and alarm settings and temperature reporting functions in your preferred units:
degrees Celsius or degrees Fahrenheit.
The relay automatically hides the Temperature Preference setting and all other
settings associated with the RTD inputs if you set RTDOPT equal to NONE.
Table 4.22 RTD Configuration Settings
Setting Prompt
Setting Range
Setting Name =
Factory Default
RTD Input Option INT
a
, EXT, NONE RTDOPT = NONE
Temperature Preference Setting C, F TMPREF = F
a
INT is only available in Models 0701010X and 0701011X.
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