second issue can affect security when the BF function is
integrated with the ZPR such that both functions operate on
the same signal representing the current through the breaker. If
the false BF initiation is due to injection testing or a wiring
error, both the ZPR functions and the BF functions will
operate on this false measurement. In a system with
standalone BF relays, these will not be the same signal, which
can mitigate this common false current reading. Whether this
impacts security or not depends on a number of factors: