Ground Current - GE B30 Instruction Manual

CHAPTER 5: SETTINGS
The positive-sequence restraint must be considered when testing for pickup accuracy and response time (multiple of
pickup). The operating quantity depends on how test currents are injected into the relay (single-phase injection):
— This setting enables and disables the neutral instantaneous overcurrent protection element.
NEUTRAL IOC1 FUNCTION
NEUTRAL IOC1 SIGNAL SOURCE
element.
— This setting specifies the neutral instantaneous overcurrent pickup level in per-unit values.
NEUTRAL IOC1 PICKUP
— This setting delays the assertion of the
NEUTRAL IOC1 PICKUP DELAY
coordination with other elements and relays.
— This setting specifies a delay for the reset of the neutral instantaneous overcurrent element
NEUTRAL IOC1 RESET DELAY
between the operate output state and the return to logic 0 after the input passes outside the defined pickup range. This
setting is used to ensure that the relay output contacts are closed long enough to ensure reception by downstream
equipment.a
— Assertion of the operand assigned to this setting blocks operation of the neutral instantaneous
NEUTRAL IOC1 BLOCK
overcurrent element.
— This setting enables and disables the logging of neutral instantaneous overcurrent events in the
NEUTRAL IOC1 EVENTS
sequence of events recorder.

5.7.6 Ground current

5.7.6.1 Menu
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  GROUND CURRENT
 GROUND CURRENT

B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
— This setting selects the signal source for the neutral instantaneous overcurrent protection
Figure 5-106: Neutral IOC1 logic
 GROUND TOC1



 GROUND TOC6


 GROUND IOC1



 GROUND IOC6


operands. It is used to achieve timing
NEUTRAL IOC OP
See below
See page 5-211
GROUPED ELEMENTS
Eq. 5-14
5
5-209