HIEE401782R0001 LTC391AE01 ABB Circuit board interface module

Description

LTC391AE01  The fundamental frequency current magnitudes for winding 1 phases A, B, and C, neutral,

and ground are shown. The current angle for phase A is always set to 0° as it is used as

reference for all other currents, both measured LTC391AE01  and derived. The maximum specified load

and average phase current are also shown for the specified winding

THD is calculated and displayed. Every THD value is calculated as the ratio of the RMS

value of the sum of the squared individual harmonic amplitudes to the RMS value of the

fundamental frequency. The calculations are based on IEEE standard 519-1986.

The actual values messages display the total LTC391AE01 harmonic distortion for phase A, B, and C

currents for windings 1 through 3, expressed as a percentage of the fundamental

frequency component. The numbers in parentheses indicate the programmed frequency

band (in terms of harmonic number) over which THD is being calculated.

The harmonic derating factor for each of the windings shows the effect of non-sinusoidal

load currents on power transformer’s rated full load LTC391AE01 current. The calculations are based on

ANSI/IEEE standard C57.110-1986. The actual values messages display the harmonic

derating factor for windings 1 through 3.

The SYSTEM FREQUENCY is calculated from the voltage input provided that voltage

sensing is enabled and the injected voltage is above 50% of VT. If these criteria are not

satisfied, then it is determined from winding 1 LTC391AE01 phase A current provided that it is above

0.05 × CT. If frequency still cannot be calculated, “0.00 Hz” is displayed, though the

sampling rate is then set for the S2 SYSTEM SETUP  TRANSFORMER  NOMINAL

FREQUENCY setpoint. The FREQUENCY DECAY RATE can only be calculated if system

frequency can be calculated.

Current demand is measured on each phase of LTC391AE01 each monitored winding. These

parameters can be monitored to reduce supplier demand penalties or for statistical

metering purposes. The calculated demand is based on the S2 SYSTEM SETUP  DEMAND

METERING  CURRENT DEMAND METER TYPE setpoint value. For each quantity, the 745

displays the demand over the most recent demand time interval, the maximum demand

since the last date that the demand data was reset, and the time and date stamp of this

maximum value.

The event record runs continuously, capturing and storing conditions present at the

moment of occurrence of the last 256 events, as well as the time and date of each event.

The header message for each event contains two pieces of information: the event number

(higher numbers denote more recent events) and the event date. If the event record is clear

or if the date has never been programmed, “Unavailable” is displayed instead of a date. No

more than 256 events are stored at the same time.

Pickup events are not recorded for elements that LTC391AE01 operate instantaneously (for example,

percent differential, instantaneous differential, etc.). Also, elements that have operate

times set to 0.00 seconds will not log pickup events. If the operate delay is set higher than

0.00, then the event recorder logs both the pickup and the operate events.

Test Mode 2 event is recorded for serial port command, using DNP protocol, to perform

cold restart. Test Mode 3 event is recorded for serial port command to perform firmware

upload.

Diagnostic message 1 is caused when 745 detects transients inside the 745.

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