701 Motor Protection Relay Date Code 20010719
Metering & Monitoring
Introduction
8.4
The relay records maximum and minimum instantaneous quantities while the
following conditions are true:
The motor is running.
Phase currents are greater than 3% of the Phase CT Secondary
Rating, ITAP setting.
Phase voltages, if included, are greater than 13 Vac.
Residual voltage is recorded only if three phase-neutral voltages are connected to
the relay and residual voltage is greater than 3 Vac. RTD temperatures are only
recorded if optional RTDs are connected and the connected RTD has not failed
open or short.
Thermal Metering
Table 8.4 Therma l Meter Values
The thermal metering function reports the present values of the RTD input
temperatures and several quantities related to the motor thermal protection function.
The thermal meter function also reports the state of connected RTDs if any have
failed. Failure messages are shown in Table 8 .5.
Table 8.4 Thermal Meter Values
Relay Option Thermal Values
All Models
% Full Load Amps
% Thermal Capacity Used
Calculated Time to Thermal Trip
Minutes Since Last Start
Starts This Hour
With RTD
Monitoring
(Relay Models
0701001 and
0701011) or when
the SEL-2600 RTD
Module is connected
All RTD Temperatures
RTD % Thermal Capacity
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