GE L90

2-42 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 2: PRODUCT DESCRIPTION
2
DIGITAL ELEMENTS
Number of elements: 48
Operating signal: any FlexLogic operand
Pickup delay: 0.000 to 999999.999 s in steps of 0.001
Dropout delay: 0.000 to 999999.999 s in steps of 0.001
Timing accuracy: ±3% or ±4 ms, whichever is greater
2.6.3 Monitoring
OSCILLOGRAPHY
Maximum records: 64
Sampling rate: 64 samples per power cycle
Triggers: any element pickup, dropout, or operate; contact input change of state; contact output change
of state; FlexLogic equation
Data: AC input channels; element state; contact input state; contact output state
Data storage: in non-volatile memory
EVENT RECORDER
Capacity: 1024 events
Time-tag: to 1 microsecond
Triggers: any element pickup, dropout, or operate; contact input change of state; contact output change
of state; self-test events
Data storage: in non-volatile memory
DATA LOGGER
Number of channels: 1 to 16
Parameters: any available analog actual value
Sampling rate: 15 to 3600000 ms in steps of 1
Trigger: any FlexLogic operand
Mode: continuous or triggered
Storage capacity: (NN is dependent on memory)
1-second rate:
01 channel for NN days
16 channels for NN days
↓
60-minute rate:
01 channel for NN days
16 channels for NN days
FAULT LOCATOR
Number of independent fault locators: 1 per CT bank (to a maximum of 4)
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 (approximation)
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
%error
+user data
CT
%error
+user data
Z
Line%error
+user data
METHOD
%error
+ 0.5% (multi-ended method)
See Theory of Operation chapter (single-ended method)
RELAY ACCURACY
%error
+1.5%
PHASOR MEASUREMENT UNIT
Output format: per IEEE C37.118 or IEC 61850-90-5 standard
Number of channels: 14 synchrophasors, 8 analogs, 16 digitals