Oscillography - GE L30 Instruction Manual

CHAPTER 5: SETTINGS
The setting assigns the FlexLogic operand representing the protection element/elements requiring
FAULT 1 REPORT TRIG
operational fault location calculations. The distance to fault calculations are initiated by this signal. The
, , and
MAG FAULT REPORT 1 Z0 MAG
For the application of entirely parallel lines, Z0M MAG/ANG is the mutual zero-sequence impedance for the whole line,
required to compensate the calculation of fault resistance and fault loop impedance.
The
FAULT REPORT 1 VT SUBSTITUTION
VTs are used, and the relay is supplied with the neutral (3V0) voltage, this setting is set to "V0". The method is still exact, as
the fault locator combines the line-to-line voltage measurements with the neutral voltage measurement to re-create the
line-to-ground voltages. See the
the delta and neutral voltages under the source indicated as input for the fault report. Also, the relay checks if the auxiliary
signal configured is marked as "Vn" by the user (under VT setup) and inhibits the fault location if the auxiliary signal is
labeled differently.
If the broken-delta neutral voltage is not available to the relay, an approximation is possible by assuming the missing zero-
sequence voltage to be an inverted voltage drop produced by the zero-sequence current and the user-specified
equivalent zero-sequence system impedance behind the relay: V0 = –Z0 × I0. In order to enable this mode of operation, the
FAULT REPORT 1 VT SUBSTITUTION
The
FAULT REP 1 SYSTEM Z0 MAG
value is "I0". The magnitude is to be entered in secondary ohms. This impedance is an average system equivalent behind
the relay. It can be calculated as zero-sequence Thevenin impedance at the local bus with the protected line/feeder
disconnected. The method is accurate only if this setting matches perfectly the actual system impedance during the fault.
If the system exhibits too much variability, this approach is questionable and the fault location results for single-line-to-
ground faults is trusted accordingly. Keep in mind that grounding points in the vicinity of the installation impact the system
zero-sequence impedance (grounded loads, reactors, zig-zag transformers, shunt capacitor banks, and so on).

5.3.9 Oscillography

5.3.9.1 Menu
SETTINGS  PRODUCT SETUP  OSCILLOGRAPHY
 OSCILLOGRAPHY

Oscillography records contain waveforms captured at the sampling rate as well as other relay data at the point of trigger.
Oscillography records are triggered by a programmable FlexLogic operand. Multiple oscillography records can be captured
simultaneously.
The is selectable, but the number of cycles captured in a single record varies considerably based on
NUMBER OF RECORDS
other factors, such as sample rate and the number of operational modules. There is a fixed amount of data storage for
oscillography; the more data captured, the less the number of cycles captured per record. See the
RECORDS  OSCILLOGRAPHY
configurations with corresponding cycles/record. The minimum number of oscillographic records is three.
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
FAULT REPORT 1 Z0M MAG
setting is set to "None" if the relay is fed from wye-connected VTs. If delta-connected
ACTUAL VALUES  RECORDS  FAULT REPORTS
setting is set to "I0".
and
FAULT REP 1 SYSTEM Z0 ANGLE
NUMBER OF RECORDS:

15
TRIGGER MODE:

Automatic Overwrite
TRIGGER POSITION:

50%
TRIGGER SOURCE:

Off
AC INPUT WAVEFORMS:

16 samples/cycle
 DIGITAL CHANNELS


 ANALOG CHANNELS


menu to view the number of cycles captured per record. The following table provides sample
impedances are entered in secondary ohms.
menu for details. It is required to configure
settings are used only when the
Range: 1 to 64 in steps of 1
Range: Automatic Overwrite, Protected
Range: 0 to 100% in steps of 1
Range: FlexLogic operand
Range: Off; 8, 16, 32, 64 samples/cycle
See below
See below
PRODUCT SETUP
FAULT REPORT 1 Z1
setting
VT SUBSTITUTION
ACTUAL VALUES 
5-115
5