Block And Operation Signals For The Phase Directional Element - GE Multilin F650 Instruction Manual

5.4 PROTECTION ELEMENTS
Table 5–41: BLOCK AND OPERATION SIGNALS FOR THE PHASE DIRECTIONAL ELEMENT
5
Internal signals provided by the relay in the directional unit are of two types, block signals and operation signals. In the
phase directional element, we can see how the obtained signals are separated for each phase (A, B, C), and by unit (1, 2,
3), and separated in block and operation signals.
Block signals indicate whether the directional unit is blocked, either by an external block signal or by polarization voltage
loss. Operation signals indicate whether the directional unit provides operation permission or not.
Upon block of the directional unit, the user can select its behavior in a block situation, this means, whether operation of its
supervised units is permitted, or on the other hand, if their operation is to be blocked under polarization voltage loss or
external block of the directional unit. This selection is made through the "Block Logic" setpoint. If the Block option is
selected, the supervised units operation will be disabled, and if the Permission option is selected, the supervised units will
remain enabled.
In the example shown on OVERCURRENT UNITS BLOCK CONFIGURATION BY THE DIRECTIONAL UNIT , the Block
Logic setpoint in the directional unit is set as Block, so in case of a directional unit block, operation signals will not produce
an output. As shown on the figure, block signals are activated, as the directional unit is blocked and the permission signals
are disabled to avoid operation of the associated protection units. If the Block Logic setpoint had set as Permission,
operation signals would be activated to allow the operation of the associated overcurrent elements.
5-44
BLOCK AND OPERATION FOR 67P
PHASE DIR1 BLOCK A
PHASE DIR1 A OP
PHASE DIR1 BLOCK B
PHASE DIR1 B OP
PHASE DIR1 BLOCK C
PHASE DIR1 C OP
PHASE DIR2 BLOCK A
PHASE DIR2 A OP
PHASE DIR2 BLOCK B
PHASE DIR2 B OP
PHASE DIR2 BLOCK C
PHASE DIR2 C OP
PHASE DIR3 BLOCK A
PHASE DIR3 A OP
PHASE DIR3 BLOCK B
PHASE DIR3 B OP
PHASE DIR3 BLOCK C
PHASE DIR3 C OP
F650 Digital Bay Controller
5 SETPOINTS
GE Multilin