SGC
51/51N FUNCTION
Definite time:
Trip order is done when the line current exceeds the threshold during more than an adjustable time.
Inverse time:
The inverse time characteristic is determined by the following equation:
The K and n values for each curve family are:
•
N.I.: Normal Inverse (K=0.14 y n= 0.02).
•
V.I.: Very Inverse (K=13.5 y n=1).
•
E.I.: Extremely Inverse (K=80 y n=2).
•
D.T.: Definite time.
•
DI: Disabled.
37
00110E4
t =
K
I
I a
( )
n
- 1
Where:
I= Line current (A)
Ia= Pickup current (A)
t = Time (s)
Summary of Contents for SGC Series
Page 31: ...6 FUNCTIONS 00110E4 EDP 26 Illustration 8 VPD unit logic diagram ...
Page 53: ...10 SCHEMATICS 10 SCHEMATICS 00110E4 EDP 48 ...
Page 54: ...SGC 49 EDP 00110E4 ...
Page 55: ...10 SCHEMATICS 00110E4 EDP 50 Illustration 13 Connection diagram ...
Page 56: ...SGC Illustration 14 SGC195 Connection diagram 51 EDP 00110E4 ...
Page 58: ...SGC 11 SIZE 53 EDP 00110E4 Drawing 1 Front and side views of SGC180 and SGC195 devices ...
Page 59: ...11 SIZE Drawing 2 Top and bottom view of SGC180 device 00110E4 EDP 54 ...
Page 60: ...SGC Drawing 3 Top and bottom view of SGC195 device 55 EDP 00110E4 ...