GE AKR-30 Series Maintenance Manual page 236

SECTION 1 2- MicroVersaTrip
The M i c roVersaTri p is a solid-state , d i rect-acti n g ,
self- powered trip device system . The M icroVersaTri p
system consists of the M icroVersaTri p p rog rammer,
cu rrent sensors, and a flux sh ifter trip device. Fig. 76
shows a block d iagram of the system .
PROG RA M M ER U N IT
1 2. 1
Fig. 77 shows a typical M icroVe rsaTr i p p rog rammer
u n it. L i ke the SST and ECS units, the M icroVersaTrip
p rovi des the com parison basis for overcu rrent detection
and del ivers the energy necessary to trip the breaker. It
contains a p rog rammable m icroelectronic processor
which incorporates nine adj usta ble ti me-cu rrent func­
tions, th ree mechanical fault i n d i cators ( local and
remote), a long-time pickup LED i n d icator ( local and
remote) and a zone selective i nterlocking function. All
adjustable p rog ram mer functions are automatic and
self-contained req u i ring no external relaying, power
supply or accessories. See Table 1 1 for trip functions
avai lable and Table 12 for trip function characteristics. A
detai led descri ption of each trip function is g iven i n
publication G EA 1 0265 a n d G EH 4657 .
FLUX SHIFTER
TRIP COIL
r
I
TAP BOARD
- - -
_ _ _
L
_
I
I
I
LOGIC
I
'OR
I
I
I
I
SUMMING
I
CIRCUITRY
NCT
I
L
_ _ _
FIG. 76
MICROVE RSATRI P B LOCK DIAG RAM
58
Trip Device
TM
I
SOLID
I
STATE
SWITCH
I
_j
&
LONG TIME
PICKUP
DELAY
&
SHORT TIME
PICKUP
DELAY
INSTANTANEOUS
PICKUP
&
GROUND FAULT
PICKUP
DELAY
d> 1
0 2
15
REGULATED
0 3
VDC
POWER SUPPLY
_ _ _ _ _ _
FAU LT TRIP IN DICATORS
1 2. 1 . 1
The optional fault trip indicators are similar t o t h e SST
indicators. They are mechanical pop-out type for identify­
ing overload or short circuit over-currents faults when
breakers are ordered without integral ground fault protec­
tion . They are also available to identify overload, short
circuit and ground fault trips for breakers supplied with
integral ground fault protection .
Each target pops out when its associated trip element
operates to trip the breaker. After a trip, the popped target
must be reset by hand. However, neglecti ng to reset does
110t affect normal operation of any trip element or prevent
the breaker from being dosed .
R E MOTE FAU LT I N DICATION
1 2 . 1 .2
Remote fault indication is available i n the form of a
mechanical contact which may be incorporated directly
i nto the customer's control circu itry. This is a Normally
open contact which is activated when its associated target
pops out. When the target is reset, the contact is returned
to its open position. Each contact is rated 0 . 25 amp at 1 25
VDC and 1 .0 amp
I
I
OVERLOAD
I
TARGET
I
I
I
SHORT
I
C I R C U IT
TARGET
I
I
GROUND
TARGET
I
I
I
I
_.
M I C ROVERSATRIP PROG RAM M ER
(
1 0 amp in rush) at 1 20 VAC.
,
tft!ll
tp;
""
GMOUtiO FAt.H.f
l'fQ(UP
FIG. 7 7