Metering - GE L90 Instruction Manual
Ur series line current differential system
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- Instruction manual (900 pages) ,
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2 PRODUCT DESCRIPTION
FAULT LOCATOR
Method:
multi-ended or single-ended during
channel failure
Voltage source:
wye-connected VTs, delta-connected
VTs and neutral voltage, delta-connected
VTs and zero-sequence current (approxi-
mation)
Maximum accuracy if:
fault resistance is zero or fault currents
from all line terminals are in phase
Relay accuracy:
±1.5% (V > 10 V, I > 0.1 pu)
Worst-case accuracy:
VT
+
user data
%error
CT
+
user data
%error
Z
+
user data
Line%error
METHOD
+
0.5% (multi-ended method), see chapter
%error
8 (single-ended method)
RELAY ACCURACY
+ (1.5%)
%error
RMS CURRENT: PHASE, NEUTRAL, AND GROUND
Accuracy at
0.1 to 2.0
CT rating: ±0.25% of reading or ±0.1% of rated
(whichever is greater)
2.0
CT rating:
±1.0% of reading
RMS VOLTAGE
Accuracy:
±0.5% of reading from 10 to 208 V
REAL POWER (WATTS)
Accuracy:
±1.0% of reading at
–0.8
REACTIVE POWER (VARS)
Accuracy:
±1.0% of reading at –0.2
APPARENT POWER (VA)
Accuracy:
±1.0% of reading
WATT-HOURS (POSITIVE AND NEGATIVE)
Accuracy:
±2.0% of reading
Range:
±0 to 1
Parameters:
three-phase only
Update rate:
50 ms
GE Multilin
PF
–1.0 and 0.8
PF
1.0
PF
0.2
6
10
MWh
L90 Line Current Differential System
PHASOR MEASUREMENT UNIT
Output format:
per IEEE C37.118 standard
Number of channels:
14 synchrophasors, 8 analogs, 16 digi-
tals
TVE (total vector error)
<1%
Triggering:
frequency, voltage, current, power, rate
of change of frequency, user-defined
Reporting rate:
1, 2, 5, 10, 12, 15, 20, 25, 30, 50, or 60
times per second
Number of clients:
One over TCP/IP port, two over UDP/IP
ports
AC ranges:
As indicated in appropriate specifications
sections
Network reporting format: 16-bit integer or 32-bit IEEE floating
point numbers
Network reporting style: rectangular (real and imaginary) or polar
(magnitude and angle) coordinates
Post-filtering:
none, 3-point, 5-point, 7-point
Calibration:
±5°
VAR-HOURS (POSITIVE AND NEGATIVE)
Accuracy:
±2.0% of reading
Range:
±0 to 1
Parameters:
three-phase only
Update rate:
50 ms
FREQUENCY
Accuracy at
V = 0.8 to 1.2 pu:
±0.001 Hz (when voltage signal is used
for frequency measurement)
I = 0.1 to 0.25 pu:
±0.05 Hz
I > 0.25 pu:
±0.001 Hz (when current signal is used
for frequency measurement)
DEMAND
Measurements:
Phases A, B, and C present and maxi-
mum measured currents
3-Phase Power (P, Q, and S) present
and maximum measured currents
Accuracy:
±2.0%
2.4 SPECIFICATIONS
2.4.4 METERING
6
10
Mvarh
2-23
2
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