CHAPTER 5: SETTINGS GROUPED ELEMENTS
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 5-231
5
PHASE DIR 1 EVENTS — This setting enables and disables the logging of phase directional overcurrent events in the
sequence of events recorder.
Figure 5-128: Phase directional logic
5.7.8 Neutral current
5.7.8.1 Menu
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) NEUTRAL CURRENT
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, 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.
NEUTRAL CURRENT
NEUTRAL TOC 1
See below
NEUTRAL TOC 2
NEUTRAL IOC 1
See page 5-233
NEUTRAL IOC 2