Primare A60 User Manual download pdf (Page 28)

DIRIS A60 - Ref.: 536 418 A GB

DEFINITION OF THE FUNCTIONS OF VOLTAGE DIPS AND INTERRUPTION,

AS WELL AS VOLTAGE SWELL AND OVER-CURRENTS

DIRIS A60 allows detecting events such as:

• Voltage dips

• Voltage swells

• Interruption

• Over-currents

A packet of 10 RMS ½ period curves (I1, I2, I2, V1,

V2, V3, U12, U23, U31) is associated with each event

detected.

An RMS ½ curve period is made up of 120 points. For

a signal at 50 Hz it represents a history on 1.2s (60 Hz

for 1s ). A conﬁgurable trigger (Pre-post mode from

0 to 100 %) allows distributing the number of points

around the event (50% / 50% = 60 points before the

event and 60 points after).

For voltage dips, swells and over-currents, an event

starts if one of the quantities exceeds the determined

threshold. It ends if all the quantities have come back

to normal condition. (hysteresis).

For voltage interruption, an event starts if all the quan-

tities exceed the determined threshold. It ends if one of

the quantities has come back to normal condition.

Depending upon the length, the events are recorded

in the following manner:

• Event < 1.2s (50 Hz), 1 packet of 10 curves over

1.2s.

• 1,2s > Event < 2.4s (50 Hz), 2 packets fol-

lowing 10 curves, i.e. 2.4s.

• Event > 2.4s (50 Hz), 1 packet of 10 curves

consisting of the beginning of the event, 1

packet of 10 curves consisting of the end of

the event.

Between these two, the values are not availa-

ble.

Voltage dips and swells

They are memorized as per IEC 61000-4-30 and

EN50160 with a category B measurement method.

Voltage interruption

It is possible to conﬁgure the outage threshold (in %

of Un), on the other hand the measurement limit of

DIRIS A60 which is 29 V AC neutral phase and 50 V

AC phase/phase must be taken into account.

Over-currents

The detection threshold is conﬁgured in % of the CT

rating. Detection is made as in the case of voltage

swell.

DIRIS A60

PROGRAMMING

Ureg = 400V

EVENT

Recording of 1,2s

End

50% 50%

Hysteresis = 380V

Threshold = 360V

U12

Example : Voltage dips with a 90 % voltage threshold and 5% hysteresis.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 59 60

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Primare A60 User Manual Page 28

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