CHAPTER 5: SETTINGS CONTROL ELEMENTS
F35 MULTIPLE FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-303
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Do not use the broken conductor function to respond to fault transients and single-pole tripping/reclosing conditions.
Therefore, program the time delay to a sufficient length to ensure coordination with the breaker dead time of the recloser
function.
BROKEN CONDUCTOR 1 FUNCTION — This setting enables and disables the broken conductor function.
BROKEN CONDUCTOR 1 SOURCE — Selects a signal source used to provide three-phase current inputs to this function.
BROKEN CONDUCTOR 1 I2/I1 RATIO — This setting specifies the ratio of negative-sequence current to positive-sequence
current. When one phase conductor is broken, the I_2 / I_1 ratio with a balanced remaining two phases is 50%. So
normally you this setting below 50% (for example, to 30%).
BROKEN CONDUCTOR 1 I1 MIN — This setting specifies the minimum positive-sequence current supervision level. Ensure this
setting is programmed to a sufficient level to prevent I_2 / I_1 from erratic pickup due to a low I_1 signal. However, do not
set this setting too high, since the broken conductor condition cannot be detected under light load conditions when I_1 is
less than the value specified by this setting.
BROKEN CONDUCTOR 1 I1 MAX — This setting specifies the maximum I_1 level allowed for the broken conductor function to
operate. When I_1 exceeds this setting, this it is considered a fault. In order for this function to not respond to any fault
conditions, set this setting to less than the maximum load current.
BROKEN CONDUCTOR 1 PKP DELAY — This setting specifies the pickup time delay for this function to operate after assertion
of the broken conductor pickup FlexLogic operand.
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