(25) O v e r c u r r e n t R e l a y
a) E a c h set v a l u e for the o v e r c u r r e n t r e l a y f a c t o r y - a d j u s t e d w i t h
the p e r f o r m a n c e of the g e n e r a t o r . Do not m o d i f y a n y set v a l u e s .
b) When the r e l a y is a c t u a t e d , t h e i n d i c a t o r ( o r a n g e ) i s lit on to
d i s p l a y the c a u s e of s u c h a c t u a t i o n . D i s p l a y of t r i p p i n g i n d i
c a t e s the p h a s e at w h i c h the t r o u b l e c u r r e n t was l a r g e s t . S h o u l d
the i n d i c a t o r d i s p l a y “i n s t a n t a n e o u s ”
. t h e r e is a larg e p o s s i
b i l i t y of s h o r t c i r c u i t . In any case, c h e c k the cause.
D i s p l a y of the i n d i c a t o r
Indicator
Troubles
Tr i
p p
i ng
I n s t a n t
aneous
Phase R
Phase T
O v e r
load
Between R and S (U-V)
•
—
—
Between S and T (V-*)
—
•
—
Between T and R (W-U)
•
( IR>IT)
•
( IT>IR)
—
B etween R.S and T(U-Y-ff)
—
Short
с
i rcu i t
Between R and S (U-V)
•
—
•
Between S and T (V-tf)
—
•
•
Between T and R (If-U)
•
( IR>IT)
•
( IT>IR)
•
Between R,S and T(U-V-W)
•
Note: IR=current in phase.R.
IT=current in
phase
T.
c) A set of f i v e L E D ’s p r o v i d e d on the s u r f a c e of the r e l a y will
i n d i c a t e the o p e r a t i n g c o n d i t i o n s of the relay.
3 -2 H A N D L I N G THE AIR C I R C U I T B R E A K E R
® C i r c u i t b r e a k e r ON b u t t o n
®
C i r c u i t b r e a k e r O F F b u t t o n
® C i r c u i t b r e a k e r ON lamp
© C i r c u i t b r e a k e r O F F lamp
( E l e c t r o m a g n e t i c o p e r a t i o n )
1) С1 o s i n g
The c i r c u i t b r e a k e r is c l o s e d by p r e s s i n g the p u s h b u t t o n s w i t c h
“O N ”
on the c o n t r o l p a n e l , a n d the c i r c u i t b r e a k e r ON lamp is lit.
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