Date Code 20010719
701 Motor Protection Relay
Metering & Monitoring
Introduction
8.1
Section 8
Metering & Monitoring
Introduction
The SEL-701 Relay features metering functions to display the present values of
current and (if included) voltage and RTD measurements. The relay provides several
methods to read the present meter values, including:
Rotating front-panel display.
Front-panel menu.
EIA-232 serial port (using SEL-701PC or ASCII text command).
Rear-panel EIA-232 (using SEL-701PC or ASCII text command) or
EIA-485 port (using Modbus
â
protocol).
Analog output.
Motor load monitoring and trending are possible using the Load Profile function.
The relay automatically configures itself to save available meter values every 15
minutes for 34 or 48 days.
For preventive maintenance purposes, the SEL-701 Relay provides a motor
operating statistics report, available using the front panel or serial port.
Also helpful in preventive maintenance tasks, the SEL-701 Relay calculates and
stores motor starting information. The relay retains motor start reports for the five
latest motor starts. The motor start trending function stores motor start averages for the
last eighteen 30-day periods.
Metering
SEL-701 Relay meter data fall into several categories:
Instantaneous metering.
Demand metering.
Max/Min metering.
Thermal metering.
Energy metering.
Содержание SEL-701
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