8
Metering & Monitoring
SIMPRO-100
112 PRIM-2400C
phase angle is associated with the fundamental
frequency magnitude, referenced to Vab or Ia at
0°. RMS quantities do not have a defined phase
angle. Reactive and apparent powers (kVAR and
kVA) are not defined for RMS measurement.
8.1.3 Demand Metering
Table 8.2 Demand Meter Values
Using the instantaneous fundamental current and
power quantities (optional), the relay calculates
new demand quantities every two seconds. The
relay uses a thermal demand calculation
algorithm with a settable time constant. You enter
the Demand Meter Time Constant as a relay
setting. The demand algorithm yields an output
equal to 0.9 times the input quantity Demand
Meter Time Constant minutes after the signal was
applied, assuming the demand was reset initially.
The demand metering function also records the
peak values of each demand quantity.
8.1.4 Max/Min Metering
Table 8.3 Max/Min Recorded Values
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.
8.1.5 Thermal Metering
Table 8.4 Thermal 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.
Relay Option Demand Meter Values
All Models Ia, Ib, Ic, In Fundamental Demand
Magnitudes
Ig Residual Current Fundamental
Demand Magnitude
Negative-Sequence Current (3I
2
)
Fundamental Demand Magnitude
With Voltage Inputs kW, kVAR, kVA Fundamental
Demand Magnitudes
Relay Option Max/Min Values
All Models Ia, Ib, Ic, In, Ig
Fundamental Magnitudes
With RTD Monitoring or when
the SIMPRO-100-RTD External
Module is connected
Up to 11 or 12 RTD Input
Temperatures
With Voltage Inputs Vab, Vbc, Vca, Vg
(wye-connection only)
Fundamental Magnitudes
kW, kVAR, kVA
Fundamental Magnitudes
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 or when
the SIMPRO-100-RTD External
Module is connected
All RTD Temperatures
RTD % Thermal Capacity
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