CET Electric Technology
32
Dip Limit
Specify the limit of Dip.
1 to 99(%) of reference voltage. Default=90%
Dip Hysteresis
Specify the return value of Dips.
1 to 1000 (x0.001 Udin). Default=5
Swell Hysteresis
Specify the return value of Swells.
1 to 1000 (x0.001 Udin). Default=5
Dip/Swell Trigger
Specify what action a setpoint can take
when Dip / Swell become active
WFR* / DWR / RMS Recorder
*default
Table 4-9 Description for Dip/Swell Parameter
The
Dip Limit
,
Swell Limit
,
Voltage Interruption Threshold
and
Dip/Swell Return
values should be
configured to meet the following criteria:
a)
The
Voltage Interruption Threshold
(please see Section 4.3.5) shall be set below
Dip Limit
.
b)
The
Swell Limit
and
Dip Limit
should associate with Voltage Rapid Changes in the minimum
difference between the two steady-states. The absolute value of the difference between the
Dip/Swell Limits and 100% must always be greater than the
Voltage Rapid Changes
in the minimum
pressure difference between the two steady-states (actual percentage).
c)
The
Dip/Swell Return
value should associate with Swell limit and Dip Limit, Dip/Swell return value
(actual value) must be less than the Dip/Swell limit (Dip, Swell of the absolute difference of the
minimum value and 100%).
d)
Regardless of whether
Dip/Swell
is enabled, the conditions for a), b) and c) must always be met.
4.3.4.5 WFR of Dips/Swells Events
Figure 4-4 WFR of a Dip Event
4.3.5 Voltage Interruptions
The PMC-690 supports the detection of
Voltage Interruptions
using a method that is in accordance with
Section 5.5 of IEC 61000-4-30 Standard for Class A performance.
4.3.5.1 Voltage Interruption Evaluation
On polyphase systems, a Voltage Interruption
begins when the
U
rms (1/2)
voltages of all channels fall below
the
Interruption Threshold
and ends when the
U
rms (1/2)
voltage on any one channel is equal to, or
greater than, the
Interruption Threshold
plus the
Hysteresis
.
The
Interruption Threshold
and
Hysteresis
are both set by the user according to the use. The
Interruption Threshold
shall not be set below the uncertainty of
Residual Voltage
measurement plus
the value of
Hysteresis
. Typically,
Hysteresis
is equal to 2% of
U
din
. The
Interruption Threshold
can, for
example, be set to 5% of
U
din
.
Содержание PMC-690
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