Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

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SEL-701-1 Monitor
Date Code 20011009
Metering & Monitoring
Introduction
7.2
Details on each of the meter data types are shown below. Section 4: Front-Panel
Operation and Section 5: ASCII Serial Port Operation describe how to access the
various types of meter data using the monitor front panel and serial ports.
Instantaneous Metering
The monitor displays both the fundamental frequency component and the RMS
values of several measurands. The fundamental frequency signal has a defined
magnitude and phase angle with respect to the other quantities. Reported phase angle is
associated with the fundamental frequency magnitude, referenced to Vab or Ia at
0 degrees. RMS quantities do not have a defined phase angle. Reactive and apparent
powers (kVAR and kVA) are not defined for RMS measurement.
Table 7.1 Measured Values
Relay Option Meter Values
All Models Ia, Ib, Ic, In Fundamental Magnitudes and Phase Angles;
RMS Values
Ig Residual Current Fundamental Magnitude and Phase Angle
Negative-Sequence Current (3I2) Magnitude and Phase Angle
Frequency
% Unbalance
With Voltage
Inputs (Relay
Models 0701101
and 0701111)
Vab, Vbc, Vca Fundamental Magnitudes and Phase Angles;
RMS Values
Vg Residual Voltage Fundamental Magnitude and Phase
Angle(wye-connection only)
Negative-Sequence Magnitude and Phase Angle
kW Fundamental and RMS Values
HP, kVAR, kVA, and pf