GE C70 Instruction Manual page 292

GROUPED ELEMENTS
The phase directional element responds to the forward load current. In the case of a following reverse fault,
the element needs some time—in the order of 8 ms—to establish a blocking signal. Some protection elements,
NOTE such as instantaneous overcurrent, respond to reverse faults before the blocking signal is established.
Therefore, a coordination time of at least 10 ms must be added to all the instantaneous protection elements
under the supervision of the phase directional element. If current reversal is of concern, a longer delay—in the
order of 20 ms—is needed.
5
5.7.3.6 Phase current unbalance (ANSI 60P, IEC PVCB/PTOC)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  PHASE CURRENT  PHASE CURRENT UNBALANCE
1(3)
 PHASE CURRENT
 UNBALANCE 1
5-168
Figure 5-79: Phase directional logic
CUR UNBALCE 1

FUNCTION: Disabled
CUR UNBALCE 1 DIF

SOURCE: SRC 1
CUR UNBALCE 1 BANK

SOURCE: SRC 1
CUR UNBALCE 1 INHNT

FACTOR A: 0.0000

C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: –0.1000 to 0.1000 in steps of 0.0001