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CHAPTER 5: SETTINGS
GROUPED ELEMENTS
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
5-225
5
There are three neutral overvoltage elements available. The neutral overvoltage element can be used to detect
asymmetrical system voltage condition due to a ground fault or to the loss of one or two phases of the source. The
element responds to the system neutral voltage (3V_0), calculated from the phase voltages. The nominal secondary
voltage of the phase voltage channels entered under
SETTINGS
SYSTEM SETUP
AC INPUTS
VOLTAGE BANK
PHASE
VT SECONDARY
is the p.u. base used when setting the pickup level.
The neutral overvoltage element can provide a time-delayed operating characteristic versus the applied voltage (initialized
from FlexCurves A, B, or C) or be used as a definite time element. The
NEUTRAL OV1 PICKUP DELAY
setting applies only if the
NEUTRAL OV1 CURVE
setting is “Definite Time.” The source assigned to this element must be configured for a phase VT.
VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs to
be wye-connected.
Figure 5-118: Neutral overvoltage1 logic
5.7.8.5 Auxiliary overvoltage (ANSI 59X, IEC PTOV)
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
VOLTAGE ELEMENTS
AUXILIARY OV1(3)
The B30 contains one auxiliary overvoltage element for each VT bank. This element is intended for monitoring overvoltage
conditions of the auxiliary voltage. The nominal secondary voltage of the auxiliary voltage channel entered under
SYSTEM
SETUP
AC INPUTS
VOLTAGE BANK X5
AUXILIARY VT X5 SECONDARY
is the per-unit (pu) base used when setting the
pickup level.
AUXILIARY OV1
AUX OV1
FUNCTION: Disabled
Range: Disabled, Enabled
AUX OV1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
AUX OV1 PICKUP:
0.300 pu
Range: 0.004 to 3.000 pu in steps of 0.001
AUX OV1 PICKUP
DELAY: 1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
AUX OV1 RESET
DELAY: 1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
AUX OV1 BLOCK:
Off
Range: FlexLogic operand
AUX OV1 TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
AUX OV1 EVENTS:
Disabled
Range: Disabled, Enabled
Summary of Contents for b30
Page 10: ...x B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Page 486: ...5 278 B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Page 616: ...iv B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...
Page 632: ...xvi B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL INDEX ...