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B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
The phase directional elements (one for each of phases A, B, and C) determine the phase current flow direction for steady
state and fault conditions and can be used to control the operation of the phase overcurrent elements via the
BLOCK
inputs
of these elements.
Figure 5-103: Phase A directional polarization
This element is intended to apply a block signal to an overcurrent element to prevent an operation when current is flowing
in a particular direction. The direction of current flow is determined by measuring the phase angle between the current
from the phase CTs and the line-line voltage from the VTs, based on the 90° or quadrature connection. If there is a
requirement to supervise overcurrent elements for flows in opposite directions, such as can happen through a bus-tie
breaker, two phase directional elements should be programmed with opposite element characteristic angle (ECA) settings.
PHASE DIR 1
ECA: 30°
Range: 0 to 359° in steps of 1
PHASE DIR POL V1
THRESHOLD: 0.700 pu
Range: 0.004 to 3.000 pu in steps of 0.001
PHASE DIR 1 BLOCK
WHEN V MEM EXP: No
Range: No, Yes
PHASE DIR 1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
PHASE DIR 1
EVENTS: Disabled
Range: Disabled, Enabled
The TARGET setting is not user-selectable and forced to "Disabled". If Targets are required from directional
elements, it can be achieved by assigning directional element output to a digital element, where targets selection
can be used as required.
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 ...
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