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Fault circuit indicators are used to detect phase to phase or earth faults or short circuits in medium voltage net: a change-over contact is used to remote the over-current tripping while a local LCD display indication is used to select the faulted area of the net.
FI/X/X is able to detect both phase to phase of phase to earth faults according to current sensors used for detection: to detect earth fault situations a three phase current sensor must be used.
The high sensitivity of earth fault indicators allow to use them in the most typical application.
Connection between tripping device and current sensor is made by electrical cables.
The energy to trip the remote indication relay is derived by fault itself, while test and manual reset are energized by internal li-ion battery (20 years is the estimated life time).
A diagnostic test can be performed locally by pressing a push-button. Reset con be performed locally by a second push button or by a remote command.
The device with stable relay maintain the changeover fault indication during the whole timing before reset, the latched one lasts only for 300ms.
The local LCD indication always lasts the whole timing before reset.
The sensors detect earth faults and short circuits inductively. The operating points for earth fault and short circuit are adjusted with a threshold level electronic. When the current exceeds the pre-adjusted threshold level, a signal is sent to the reading instrument for evaluation. The respective LCD indication is activated and starts to blink.