ABB RELION REX640 Technical Manual page 661

Protection and control

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1MRS759142 F

Operation "Test/blocked"

Figure 372: Operation logic of the fail safe function

The function can also be set into "test/blocked" state with the

This can also be utilized during the commissioning.

The BLOCK input is provided for blocking the function with the logic. When the

function is blocked, the monitored data and measured values are still available but

the binary outputs are blocked. When the function is blocked, the direct inter-trip is

also blocked.

The PRO_ACTIVE output is always active when the protection function is capable

of operating. PRO_ACTIVE can be used as a blocking signal for backup protection

Once activated, the timer activates the STR_LS_LOC output. Depending on the value

IDMT. When the operation timer has reached the value set with the

time in the DT mode or the maximum value defined by the inverse time curve, the

OPR_LS_LOC output is activated. When the operation mode is according to IDMT,

Low operate value is used as reference value (Start value) in the IDMT equations

presented in the Standard inverse-time characteristics section.

A timer reset state is activated when a drop-off situation happens. The reset is done

according to the DT characteristics.

Instantaneous high stage

In addition to the stabilized low stage, LNPLDF has an instantaneous high stage.

The stabilizing is not done with the instantaneous high stage. The instantaneous

high stage operates immediately when the differential current amplitude is higher

than the set value of the

Mult setting.

Technical Manual

communication

Operation "Oﬀ"

Operating curve type , the timer characteristics are according to DT or

For a detailed description of the timer characteristics, see the

General function block features

High operate value setting. If the ENA_MULT_HS input is

High operate value setting is internally multiplied by the High Op value

section in this manual.

Protection functions

Operation setting.

Operate delay