Power System - GE L30 Instruction Manual

SYSTEM SETUP
5.5.1.2 Voltage banks
SETTINGS  SYSTEM SETUP  AC INPUTS  VOLTAGE BANK F5
 VOLTAGE BANK F5

Two banks of phase/auxiliary VTs can be set, where voltage banks are denoted in the following format (X represents the
module slot position letter):
Xa, where X = {F} and a = {5}
See the Introduction to AC Sources section at the beginning of this chapter for details.
With VTs installed, the relay can perform voltage measurements as well as power calculations. Enter the
made to the system as "Wye" or "Delta." An open-delta source VT connection is entered as "Delta."
CONNECTION
5
The nominal
voltage is applied to the VT primary.
For example, on a system with a 13.8 kV nominal primary voltage and with a 14400:120 volt VT in a delta
connection, the secondary voltage is 115; that is, (13800 / 14400) × 120. For a wye connection, the voltage value
entered must be the phase to neutral voltage, which is 115 /
On a 14.4 kV system with a delta connection and a VT primary to secondary turns ratio of 14400:120, the voltage
value entered is 120; that is, 14400 / 120.

5.5.2 Power system

SETTINGS  SYSTEM SETUP  POWER SYSTEM
 POWER SYSTEM

The power system
cannot be measured from available signals. This can happen if the signals are not present or are heavily distorted. Before
reverting to the nominal frequency, the frequency tracking algorithm holds the last valid frequency measurement for a
safe period of time while waiting for the signals to reappear or for the distortions to decay.
5-136
PHASE VT F5

CONNECTION: Wye
PHASE VT F5

SECONDARY: 66.4 V
PHASE VT F5

RATIO: 1.00 :1
AUXILIARY VT F5

CONNECTION: Vag
AUXILIARY VT F5

SECONDARY: 66.4 V
AUXILIARY VT F5

RATIO: 1.00 :1
voltage setting is the voltage across the relay input terminals when nominal
PHASE VT F5 SECONDARY
NOMINAL FREQUENCY:

60 Hz
PHASE ROTATION:

ABC
FREQUENCY AND PHASE

REFERENCE: SRC 1
FREQUENCYTRACKING:

Enabled
value is used as a default to set the digital sampling rate if the system frequency
NOMINAL FREQUENCY
Range: Wye, Delta
Range: 25.0 to 240.0 V in steps of 0.1
Range: 1.00 to 24000.00 in steps of 0.01
Range: Vn, Vag, Vbg, Vcg, Vab, Vbc, Vca
Range: 25.0 to 240.0 V in steps of 0.1
Range: 1.00 to 24000.00 in steps of 0.01
= 66.4.
Range: 25 to 60 Hz in steps of 1
Range: ABC, ACB
Range: SRC 1, SRC 2
Range: Disabled, Enabled
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
PHASE VT F5