M Icroversatri P '" Trip D Evice; Programmer Unit; Fault Trip Indicators; Remote Fault Indication - GE AKR-30 Series Maintenance Manual

SECTION 1 2- MicroVersaTrip ™ Trip Device
The M ic roVersaTri p is a solid-state , d i rect-act i n g ,
self-powered tri p device system . T h e M icroVersaTrip
system consist s of the M ic roVersaTr i p p rog ram mer,
cu rrent sensors , and a flux sh ifter t r i p d evice. Fig. 76
shows a block d i ag ram of the system .
1 2. 1
PROGRAM M E R U N IT
Fig. 77 shows a typical M icroVe rsa Trip p rog rammer
u n it. Like the SST and ECS u n its, the M icroVersa Trip
p rovides the com parison basis for overcu rrent d etection
and del ivers the energy necessary to trip the b reaker. It
contai ns a program mable m i c roelectronic p rocessor
which incorporates nine adj ustable ti me-cu rrent func­
tions, th ree mechan ical 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
adj ustable p rog rammer fu nctions are automatic and
self-contai ned req u i r i ng no external relayi ng, power
su pply or accessories. See Table 1 1 for t r i p functions
available and Table 12 for tri p fu nction characteristics. A
detai led descri ption of each t r i p function is g iven i n
p u b l i cation G EA 1 0265 a n d GEH 4657.
»-
FLUX SHIFTER
TRIP COIL
r
I I
TAP BOARD
L CT
- - -
_
I
I
I
LOGIC
I
'OR
I
I
I
I
SUMMING
I
CIRCUITRY
N
I
L
_ _ _
FIG. 76
MICROVERSATRI P B LOCK DIAG RAM
58
I
SOLID
I
STATE
SWITCH
I
_j
&
LONG TIME
PICKUP
DELAY
&
SHORT TIME
PICKUP
DELAY
PICKUP
&
GROUND FAULT
PICKUP
DELAY
<1> 1
15
REGULATED
<1> 3
<1> 2
VDC
POWER SUPPLY
_ _ _ _ _ _
1 2.1 .1 FAU LT TRIP I N DICATORS
The optional fault trip indicators are similar to the 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
tio n . They are also avail able to identify overload, short
circuit and ground fault trips for breakers supplied with
i ntegral 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, neglecting to reset does
not affect normal operation of any trip element or prevent
the breaker from being dosed.
1 2. 1 .2 R EMOTE FAU LT IN DICATION
Remote fault ind ication is available i n t h e form o f a
mechanical contact which may be i ncorporated directly
i nto the customer's control ci rcuitry. 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 ( 1 0 amp in rush) at 1 20 VAC.
I
I
OVERLOAD
I
TARGET
I
I
I
SHORT
I
CIRCUIT
TARGET
I
I
GROUND
TARGET
I
I
I
I
__.
M I C ROVERSATRI P PROGRA M M ER
' "
"'
"'
.,_..
$HQI!l -
"' ' "'
'
- - �·
""'
!!A ?�
LONG ,_
FIG. 7 7