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ABB CI546 3BSE012545R1 communication unit

Synchrocheck

The synchrocheck function determines the difference between the amplitudes, phase

angles and frequencies of two voltage vectors. The synchrocheck function also contains

checks for dead line and dead bus.

Transformer differential protection

• For two- and three-winding transformers

• Auto transformers

• Three-phase function

• Current-adaptive characteristic

• High stability for external faults and current

transformer saturation

• No auxiliary transformers necessary

because of vector group and CT ratio compensation

• Inrush restraint using 2nd harmonic

The transformer differential protection function

can also be used as an autonomous T-zone

protection in a 1½ breaker scheme.

Thermal overload

This function protects the insulation against

thermal stress. This protection function is normally equipped with two independently set

levels and is used when oil overtemperature

detectors are not installed.

Peak value over- and undercurrent protection

These functions are used for current monitoring with instantaneous response and where

insensitivity to frequency is required.

Peak value over- and undervoltage protection

This function is used for voltage monitoring

with instantaneous response and where insensitivity to frequency is required.

Frequency function

The function is used either as an over-/ underfrequency protection, or for load-shedding in

the event of an overload. Several stages of

the frequency protection are often needed.

This can be achieved by configuring the frequency function several times.

Rate of change frequency protection df/dt

This function is used for the static, dynamic

and adaptive load-shedding in power utilities

and industrial distribution systems. The function supervises the rate-of-change df/dt of one

voltage input channel. Several stages of the

rate-of-change frequency protection are often

needed. This can be achieved by configuring

the rate-of-change frequency function several

times.

Definite time overfluxing protection

This function is primarily intended to protect

the iron cores of transformers against excessive flux. The function works with a definite

time delay. The magnetic flux is not measured

directly. Instead the voltage/frequency-ratio,

which is proportional to the flux is monitored.

Inverse time overfluxing protection

This function is primarily intended to protect

the iron cores of transformer against excessive flux. The function works with an inverse

time delay. The inverse curve ca be set by a

table of 10 values and the times t-min and tmax. The magnetic flux is not measured directly. Instead the voltage/frequency-ratio,

which is proportional to the flux is monitored.

Power function

This function provides single, or three phase

measurement of the real or apparent power.

The function can be configured for monitoring

reverse, active or reactive power (power

direction setting). Phase angle errors of the

CT/VT inputs can be compensated by setting.

The operating mode can be configured either

to underpower or to overpower protection.

Logics and delay/integrator

These functions allow the user the engineering of some easily programmable logical functions and are available as standard also in the

REB500 functionality.

Directional sensitive earth fault protection

for grounded systems

A sensitive directional ground fault function

based on the measurement of neutral current

and voltage is provided for the detection of

high-resistance ground faults in solidly or lowresistance grounded systems. The scheme

operates either in a permissive or blocking

mode and can be used in conjunction with an

inverse time earth fault overcurrent function.

In both cases the neutral current and voltage

can be derived either externally or internally.

This function works either with the same communication channel as the distance protection

scheme or with an independent channel.

Directional sensitive earth fault protection

for ungrounded or compensated systems

The sensitive earth fault protection function for

ungrounded systems and compensated systems with Petersen coils can be set for either

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