Woodward HighPROtec MCDLV4, Manual

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Protective Elements
The following table shows the application options of the voltage protection element
Applications of the V-Protection Module Setting in Option
ANSI 27 Undervoltage protection Device Planning menu
Setting: V< Measuring Method:
Fundamental/TrueRMS
Measuring Mode:
Phase to ground, Phase-to-Phase
10 minutes sliding average supervision V< Device Planning menu
Setting: V< Measuring Method: Umit
Measuring Mode:
Phase to ground, Phase-to-Phase
ANSI 59 Overvoltage protection Device Planning menu
Setting: V> Measuring Method:
Fundamental/TrueRMS
Measuring Mode:
Phase to ground, Phase-to-Phase
Sliding average supervision V> Device Planning menu
Setting: V> Measuring Method: Vavg
Measuring Mode:
Phase to ground, Phase-to-Phase
Measuring Method
For all protection elements it can be determined, whether the measurement is done on basis of the »
Fundamental«
or if » TrueRMS« measurement is used. In addition to that a sliding average supervision »Vavg« can be
parametrized.
The required settings for the calculation of the “average value” of the “sliding
average value supervision” have to be taken within menu
[Device Para\Statistics\Vavg].
Measuring Mode
If the measuring inputs of the voltage measuring card is fed with “Phase to Ground” voltages, the Field Parameter
»VT con« has to be set to “Phase to Ground”. In this case, the user has the option to set the »Measuring Mode« of
each phase voltage protection element to“Phase to Ground” or “Phase to Phase”. That means, he can determine for
each phase voltage protection element how Vn shall be defined:
•
»Measuring Mode« = “Phase to Ground” –
Vn
=
VT sec
√ 3
•
»Measuring Mode« = “Phase to Phase” –
Vn
=
VT sec
If, however, the measuring inputs of the voltage measuring card are fed with “Phase to Phase” voltages (
»VT con«
= “Phase to Phase”), then the setting of
»Measuring Mode« is ignored and internally set to “Phase to Phase”
instead, so that
Vn
=
VT sec
.
825 MCDLV4 DOK-HB-MCDLV4-2E