Woodward HighPROtec MCDLV4, Manual

Page: 1256 / 1275

Specifications
Protection Elements Accuracy
The tripping delay relates to the time between alarm and trip.
The accuracy of the operating time relates to the time between fault entry and
the time when the protection element is picked-up.
Reference conditions for all Protection Elements: sine wave, at rated frequency, THD < 1%
Measuring method: Fundamental
Overcurrent Protection Elements:
I[x] Accuracy *2)
I> ±1.5% of the setting value or ±1% In
Dropout Ratio 97% or 0.5% In
t DEFT
±1% or ±10 ms
Operating Time
At testing current >= 2 times pickup value
<36ms
(directional elements: <40ms)
Disengaging Time <55ms
t-char ±5% (according to selected curve)
t-reset (Reset Mode = t-delay) ±1% or ±10 ms
Overcurrent Protection Elements:
I[x]
with selected Measuring method = I2
(Negative phase sequence current)
Accuracy
I> ±2% of the setting value or ±1% In
Dropout Ratio 97% or 0.5% In
t DEFT
±1% or ±10 ms
Operating Time
At testing current >= 2 times pickup value
<60ms
Disengaging Time <45ms
*2) For directional elements, accuracy of MTA: ±3° at I >20% In.
Ground Current Elements:
IG[x]
Accuracy
*2) *3)
IG> ±1.5% of the setting value or ±1% In
Dropout Ratio 97% or 0.5% x In
t DEFT
±1% or ±10 ms
Operating time
Starting from IG higher than 1.2 x IG> <45ms
Disengaging Time <55ms
t-char ±5% (according to selected curve)
t-reset (Reset Mode = t-delay) ±1% or ±10 ms
VE> ±1.5% of the setting value or ±1% Vn
Dropout Ratio 97% or 0.5% Vn
*2) For directional elements, accuracy of MTA: ±3° at IG >20% In.
*3) For earth current sensitive the precision does not depend on the nominal value but is referenced to 100 mA (with In =1 A) respectively 500
mA (with In = 5 A)
1256 MCDLV4 DOK-HB-MCDLV4-2E