ABB Relion 670 Series Technical Reference Manual page 866

Line differential protection ansi

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more of the IEDs binary outputs, as well as to other functions within the IED requiring

this signal.

Operation Mode = Enabled

Program = 3 phase

ANSI10000266 V1 EN

Simplified logic diagram for three pole trip

SMPPTRC (94) function for single-pole and two-pole tripping has additional phase

segregated inputs for this, as well as inputs for faulted phase selection. The latter inputs

enable single- pole and two-pole tripping for those functions which do not have their

own phase selection capability, and therefore which have just a single trip output and

not phase segregated trip outputs for routing through the phase segregated trip inputs of

the expanded SMPPTRC (94) function. Examples of such protection functions are the

residual overcurrent protections. The expanded SMPPTRC (94) function has two

inputs for these functions, one for impedance tripping (for example, carrier-aided

tripping commands from the scheme communication logic), and one for ground fault

tripping (for example, tripping output from a residual overcurrent protection).

Additional logic, including a timer tWaitForPHS, secures a three-phase trip command

for these protection functions in the absence of the required phase selection signals.

The expanded SMPPTRC (94) function has three trip outputs TR_A, TR_B, TR_C

(besides the trip output TRIP), one per phase, for connection to one or more of the

IEDs binary outputs, as well as to other functions within the IED requiring these

signals. There are also separate output signals indicating single-pole, two-pole or three-

pole trip. These signals are important for cooperation with the autorecloser SMBRREC

(79) function.

The expanded SMPPTRC (94) function is equipped with logic which secures correct

operation for evolving faults as well as for reclosing on to persistent faults. A special

input is also provided which disables single- pole and two-pole tripping, forcing all

tripping to be three-pole.

In multi-breaker arrangements, one SMPPTRC (94) function block is used for each

breaker. This can be the case if single pole tripping and autoreclosing is used.

1MRK505222-UUS C

ANSI10000266-1-en.vsd

Technical reference manual

Relion red670