ABB SA168 3BSE003389R1 After sales service is provided for the control card of the power supply device

Description

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Earth fault on toroid (G ext – ANSI 51G & 50GTD): with trip time independent of the current (t = k) or
with constant specific let-through energy (t = k/l2). Pre-alarm that 90% threshold has been reached permit
the fault to be reported to supervision systems without interruption of continuity. The protection uses the
external toroid installed, for example, on the star centre of the transformer, and is an alternative to the G
and Rc functions. The function is active with an auxiliary supply.
Neutral protection: available at 50%, 100%, 150% or 200% of the phase currents, or disabled, it is
applied to the overcurrent protections L, S and I.
Start-up function: enables protections S, I and G to operate with higher trip thresholds during the
starting phase, avoiding untimely trips due to high inrush currents of certain loads (motors, transformers,
lamps). The starting phase lasts 100 ms to 30 s and is recognized automatically by the trip unit:
– at the closing of the circuit-breaker with a self-supplied trip unit;
– when the peak value of the maximum current exceeds the set threshold (0.1…10 x In) with an externally
supplied trip unit; a new start-up is possible after the current falls below the threshold.
Current unbalance (IU – ANSI 46): with constant trip time (t = k), protects from an unbalance between
the currents of the single phases protected by the circuit breaker.
Zone selectivity for S and G protection (ANSI 68): can be used to minimize circuit-breaker trip times
closer to the fault. The protection is provided by connecting all the zone selectivity outputs of the trip
units belonging to the same zone and taking this signal to the trip unit input that is immediately upstream.
Each circuit-breaker that detects a fault reports it to the circuit-breaker upstream; the circuit-breaker thus
detects the fault but does not receive any communication from those downstream and opens without
waiting for the set delay to elapse. It is possible to enable zone selectivity if the fixed-time curve has been
selected and the auxiliary supply is present.
Current thresholds: this function enables the realization of four independent thresholds to be indicated in
order to enable corrective action implementation before the overload L protection trips the circuit-breaker.
For example, by disconnecting loads located downstream of the circuit-breaker that are controlled by Ekip
Signalling.
Power Controller: Power controller function (optional) with Ekip Measuring module.