Woodward easYgen-2000 Series User Manual page 125

Measured ground fault
ID Parameter
3250 Monitoring
3256
3254 Limit
3260
3255 Delay
3261
37535B
Configure Monitoring > Generator > Generator Ground Fault (Le...
The pointer between the neutral point and the point of the shifted
pointer I
In order to be able to add the pointers vectorially, these must be
divided into their X- and Y-coordinates (IL2X, IL2Y, IL3X and IL3Y).
The ground fault current may be calculated using the following for‐
mula:
(I
n
L1rated
1.73 = I
(7 A + 7 A + 7 A) – (7A + 6.5 A + 6 A) / 1.73 = 0.866 A
n
Results of a calculation example:
Phase current I
n
Phase current I
n
Phase current I
n
Ground fault current is actively measured when the mains current
input is configured to monitor for ground current. The ground fault
threshold is configured as a percentage of the value entered for
parameter "Ground current transformer" (parameter
1810 Ä p.
CL Setting range Description
[Default]
2 On Ground current monitoring is carried out according to the following parame‐
ters. Monitoring is performed at two levels. Both values may be configured
independent from each other (prerequisite: Level 1 < Level 2).
[Off] Monitoring is disabled for Level 1 limit and/or Level 2 limit.
2 0 to 300 % The percentage values that are to be monitored for each threshold limit are
defined here.
3254: [10 %]
If this value is reached or exceeded for at least the delay time without inter‐
3260: [30 %]
ruption, the action specified by the alarm class is initiated.
Notes
This value refers to the Generator rated current of the generator (param‐
eter
rent values.
It refers to the parameter "Ground current transformer" (parame‐
terr
The ground fault threshold shall not exceed the mains/ground current meas‐
uring range (approx. 1.5 × I
on page 473 ).
2 0.02 to 99.99 s If the monitored ground fault exceeds the threshold value for the delay time
configured here, an alarm will be issued.
3255: [0.20 s]
3261: [0.10 s]
easYgen-2200/2500 | Genset Control
' results is the sum current I
L2
+ I + I ) - (I
L2rated L3rated
S
= I = 7 A
L1 Rated
= 6.5 A
L2
= 6 A
L3
101).
The ground fault protection zone is determined by the
physical installation location of the generator current
transformer.
1754 Ä p. 95), if the ground current is calculated from the generator cur‐
1810 Ä p. 101), if the ground current is measured directly.
Ä Chapter 8.1 "Technical Data"
;
rated
Configuration
as shown in (Fig. 74/2).
S
+ I + I
L1measured L2measured L3measured
) /
125