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Home >> ABB >> ABB FM9925A-E HIEE451116R0001 programmable control detection module

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ABB FM9925A-E HIEE451116R0001 programmable control detection module

The feeder protection relay is provided with

six energizing inputs for phase currents and

inputs for residual or neutral currents. The

relay is also equipped with nine output relays

for CB control, signalling, etc.

The differential relay consists of three protec tion relay modules, i.e. a differential relay

module, an earth-fault relay module and a

combined overcurrent and earth-fault relay

module. The modules are withdrawable as are

the power supply module and the I/O relay

module located behind the system front

panel.

Differential relay module

SPCD 3D53

The differential relay module includes three

protection units, i.e. a stabilized differential

current unit, an instantaneous differential cur rent unit and a circuit-breaker failure protec tion unit. In addition, the module contains a

disturbance recorder unit.

The stabilized differential current unit consti tutes the main differential protection. The

unit is provided with second and third har monic restraint, selectable transformer vector

group, zero-sequence current elimination,

numerical correction of CT ratios and flexible

configuration of tripping, blocking and con trol signals.

The instantaneous, non-stabilized differential

current unit functions as an ultra-fast protec tion unit with an operate time less than 30 ms

at heavy faults.

The circuit-breaker failure protection unit is

activated by the main trip signal of the other

protection units and it provides a second trip

signal to be routed to a back-up circuit

breaker if the main CB fails to operate.

The differential relay module also incorpo rates a digital disturbance recorder module.

The module continuously monitors the object

protected and stores pre- and post-fault net work information, which can be used for

post-fault analysis.

Earth-fault relay module

SPCD 2D55

The earth-fault relay module measures the

neutral current and/or residual current on both

sides of the object protected. The earth-fault

protection can be implemented by four differ

ent principles, i.e. the high-impedance principle, the numerical stabilized differential

current principle, the residual overcurrent

principle or the neutral overcurrent principle.

Both sides of the object can be protected

independent of each other, which means that

the protection principle on one side does not

have to be the same as that of the other side.

The circuit-breaker failure protection unit is

activated by the main trip signal of the protection units and it provides a second trip signal to be routed to a back-up circuit breaker if

the main CB fails to operate.

The earth-fault relay module also incorporates a digital disturbance recorder module.

The module continuously monitors the object

protected and stores pre- and post-fault network information, which can be used for

post-fault analysis.

Combined overcurrent and

earth-fault relay module

SPCJ 4D28

The combined overcurrent and earth-fault

module includes four protection units, i.e. an

overcurrent unit, an earth-fault unit, a phase

discontinuity unit and a circuit-breaker failure

protection unit.

The three-phase overcurrent unit comprises

three overcurrent stages, i.e. a low-set stage

I>, a high-set stage I>> and a super high-set

stage I>>>. The low-set stage can be given

definite time characteristic or inverse time

characteristic while the high-set stage and the

super high-set stage have a definite time characteristic.

The non-directional earth-fault unit comprises two protection stages, i.e. a low-set

stage I0> and a high-set stage I0>>. The lowset stage can be given definite time characteristic or inverse time characteristic while the

high-set stage has a definite time characteristic.

The phase discontinuity protection unit measures the phase unbalance and has a definite

time characteristic.

The circuit-breaker failure protection unit is

activated by the main trip signal of the protection units and it provides a second trip signal to be routed to a back-up circuit breaker if

the main CB fails to operate.

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