9
8
Features
1
Optimum protective
coordination
Why use a separate panel mounted protection relay when
you can have all the benefits of I.D.M.T. protection integral to
the ACB?
TemPower2
is available with a choice of flexible protection curves
to assist in selectivity applications.
S.I. Standard Inverse
V.I. Very Inverse
E.I. Extremely Inverse
All these curves are user definable and comply with IEC 60255-3.
Standard transformer and generator protection characteristics are
also available.
AGR-L Industrial & transformer protection
AGR-S Generator protection
AGR-R Characteristics to IEC 60255-3
I
0.02
t
It
I
2
t = S.I.
I
3
t = V.I.
I
4
t = E.I.
Inverse Definite Minimum Time (I.D.M.T.)
Zone Interlocking
In conventional discrimination systems, short time delays
are used to allow a short-circuit current to be tripped by
the circuit breaker nearest the fault. The disadvantage of
this type of system is during a fault; considerable thermal
and mechanical stresses are placed on the entire system.
With the
TemPower2
Z Interlock system the breaker
nearest the fault irrespective of the short time delay
setting will trip first.
Example of operation:
If a fault occurs in Zone 2, only AR Z Interlock
‘A’ will sense any fault current fault, a no fault signal will
be sent by AR Z Interlock ‘B’ & ‘C’, consequently AR Z
Interlock ‘A’ trips the ACB immediately, overriding its short
time delay.
Protection relay
performance
Ensure that the ACB you specify suffers no loss of
performance when tripped by an external protection relay!
The
TemPower2 ACB
suffers no loss in performance when
tripped through an external protection relay.
Some competitor’s ACBs have reduced breaking
performance when an external protection relay is used.
External
Relay
100kA
Double opening and
closing coils
Double Opening and Closing Coils provides extended control
system redundancy to an ACB. Double coils allow designers to
implement back-up tripping and closing systems. It provides the
end user with ultimate reliability on critical UPS circuits
connected to critical loads.
Earthing Device
The unique design of
TemPower2 ACBs
allows for the
earthing of either the busbar (line) or the circuit (load) of a
low voltage system. Thus allowing system flexibility.
Some other manufactures only offer one option either,
busbar or circuit earthing.
For full details refer to page 44
65kA 85kA 100kA
“
TemPower2 ACB
”
With internal or external
protection relay.
