PFSK164 3BSE021180R1 ABB DSP signal processing module

PFSK164 3BSE021180R1 ABB DSP signal processing module

PFSK164 3BSE021180R1 ABB DSP signal processing module

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These releases are connected with current transformers (three or four

according to the number of conductors to be protected), which are positioned

inside the circuit-breaker and have the double functions of supplying the

power necessary to the proper functioning of the release (self-supply) and of

detecting the value of the current flowing inside the live conductors; therefore

they are compatible with alternating current networks only.

The signal coming from the transformers and from the Rogowsky coils is

processed by the electronic component (microprocessor) which compares

it with the set thresholds. When the signal exceeds the thresholds, the trip of

the circuit-breaker is operated through an opening solenoid which directly

acts on the circuit-breaker operating mechanism.

In case of auxiliary power supply in addition to self-supply from the current

transformers, the voltage shall be 24 Vdc ± 20%.

The protection functions available for the electronic releases are:

L - Overload protection with inverse long time delay

Function of protection against overloads with inverse long time delay and

constant specific let-through energy; it cannot be excluded.

L - Overload protection in compliance with Std. IEC 60255-3

Function of protection against overloads with inverse long time delay and trip

curves complying with IEC 60255-3; applicable in the coordination with fuses

and with medium voltage protections.

S - Short-circuit protection with adjustable delay

Function of protection against short-circuit currents with adjustable delay; thanks

to the adjustable delay, this protection is particularly useful when it is necessary

to obtain selective coordination between different devices.

D - Directional short-circuit protection with adjustable delay

The directional protection, which is similar to function S, can intervene in a

different way according to the direction of the short-circuit current; particularly

suitable in meshed networks or with multiple supply lines in parallel.

I - Short-circuit protection with instantaneous trip

Function for the instantaneous protection against short-circuit.

G - Earth fault protection with adjustable delay

Function protecting the plant against earth faults.

U - Phase unbalance protection

Protection function which intervenes when an excessive unbalance between

the currents of the single phases protected by the circuit-breaker is detected.

OT - Self-protection against overtemperature

Protection function controlling the opening of the circuit-breaker when the temperature inside the release can jeopardize its functioning.

UV - Undervoltage protection

Protection function which intervenes when the phase voltage drops below the

preset threshold.