Tracking Frequency; Frequency Rate Of Change; Flexelements - GE L90 Instruction Manual

METERING

6.4.6 Tracking frequency

ACTUAL VALUES  METERING  TRACKING FREQUENCY
 TRACKING FREQUENCY

The tracking frequency displays here. The frequency is tracked based on configuration of the reference source. The
TRACKING FREQUENCY
at all terminals. If currents are below 0.125 pu, then the

6.4.7 Frequency rate of change

ACTUAL VALUES  METERING  FREQUENCY RATE OF CHANGE 1(4)
 FREQUENCY RATE
 OF CHANGE 1
The metered frequency rate of change for the frequency rate of change elements is shown here.

6.4.8 FlexElements

ACTUAL VALUES  METERING  FLEXELEMENTS  FLEXELEMENT 1(8)
 FLEXELEMENT 1

The operating signals for the FlexElements are displayed in pu values using the following definitions of the base units.
Table 6-2: FlexElement base units
Base unit
87L SIGNALS
(Local IA Mag, IB, and IC)
6
(Diff Curr IA Mag, IB, and IC)
(Terminal 1 IA Mag, IB, and IC)
(Terminal 2 IA Mag, IB and IC)
87L SIGNALS
(Op Square Curr IA, IB, and IC)
(Rest Square Curr IA, IB, and IC)
BREAKER ACC ARCING AMPS
(Brk X Acc Arc Amp A, B, and C)
BREAKER ARCING AMPS
(Brk X Arc Amp A, B, and C)
DCmA
FAULT LOCATION
FREQUENCY
FREQUENCY RATE OF CHANGE
PHASE ANGLE
POWER FACTOR
RTDs
SENSITIVE DIR POWER
(Sns Dir Power)
SOURCE CURRENT
SOURCE ENERGY
(Positive and Negative Watthours,
Positive and Negative Varhours)
SOURCE POWER
6-24
TRACKING FREQUENCY:

60.00 Hz
is based on positive sequence current phasors from all line terminals and is synchronously adjusted
FREQUENCY RATE OF

CHANGE1: 0.00 Hz/s
FLEXELEMENT 1

OpSig:
Description
I = maximum primary RMS value of the +IN and –IN inputs
BASE
(CT primary for source currents, and 87L source primary current for line differential currents)
BASE = Squared CT secondary of the 87L source
2
× cycle
BASE = 2000 kA
2
BASE = 1 kA × cycle
BASE = maximum value of the DCMA INPUT MAX setting for the two transducers configured
under the +IN and –IN inputs.
BASE = Line Length as specified in Fault Report
f = 1 Hz
BASE
df/dt = 1 Hz/s
BASE
ϕ = 360 degrees (see the UR angle referencing convention)
BASE
PF = 1.00
BASE
BASE = 100°C
P = maximum value of 3 × V
BASE
for the sensitive power directional element(s).
I = maximum nominal primary RMS value of the +IN and –IN inputs
BASE
E = 10000 MWh or MVAh, respectively
BASE
P = maximum value of V
BASE
is used.
NOMINAL FREQUENCY
0.000
× I for the +IN and –IN inputs of the sources configured
BASE BASE
× I for the +IN and –IN inputs
BASE BASE
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: ACTUAL VALUES