InteliPro, SW version 1.4,
©
ComAp
–
April 2014
InteliPro 1.4 Comprehensive Guide - rev. 1
2-4
Operation mode with 2 trip outputs
In some cases, the protection relay is requested to operate two circuit breakers. Usually, one
of them is considered as the main circuit breaker, with most of the functions configured to
operate this circuit breaker. As mentioned above, this breaker often corresponds to the "Mains
Circuit Breaker" = MCB as used in ComAp controllers.
The second circuit breaker can be from the point of view of the protection relay considered as
a supplementary contactor in the power connection scheme. It can provide back-up
functionality in case that the CB1 does not trip on command, or can be operated individually
by selected protective functions. It can, but does not necessarily have to correspond to the
"Generator Circuit breaker" = GCB as used in the ComAp controllers applications. In such
case, e.g. NVD function is the most often case, when GCB (CB2) is tripped instead of MCB
(CB1).
In case that 2 circuit breakers are controlled by InteliPro unit, it is possible to freely assign,
swap or configure the functionalities of both circuit breakers and provide appropriate back-up
function of the breakers by the "
" functionality. It is not practical to use the
Comm Trp output in this case. To distinguish between the 2 breakers, outputs
and
are available.
For each protective function in InteliPro, it is possible to assign either Trip 1 or Trip 2 function,
none of them, or both. The setpoint xxx Trp BO (e.g.
) in the appropriate group of
protection setting is used for this assignment. By this setting, the output Trp 1 or 2 will then
contain only those functions which were assigned to it.
Trip 1 output is internally interconnected with CB1 operation, i.e. in case of activation of Trp 1,
is expected to be deactivated. The same applies for Trip 2: in case of
activation of Trp 2, the
is expected to be deactivated.
Priority switching
Priority switching feature allows using the circuit breakers CB1 and CB2 as a backup to the other one.
To clearly understand this, it is necessary first to understand the possibility of assignment of any of the
operated two circuit breakers to the appropriate protective function (see the chapter
Though both of the breakers are equivalent and fully assignable within the InteliPro relay, the most
common application for generator-to-mains connection is as follows:
CB1 is considered as the main contactor of the generator to the mains. In ComAp products,
this breaker is called "Mains Circuit Breaker" = MCB.
CB2 is considered as a supplementary contactor on the power connection between generator
and mains. There can be specific protection functions assigned to trip CB2 only and it can
provide back-up functionality to the CB1. It can, but does not necessarily have to correspond
to the "Generator Circuit breaker" = GCB as used in the ComAp products.
Please note, that as both circuit breakers are equivalent, it is also possible to assign CB2 as
the main one and CB1 as the backup, or provide a symmetrical backup of both breakers "one
to each other".
Depending on setting the setpoint
, the following backup function is provided:
DISABLED
- no CB backup is provided
CB1 -> CB2
- CB1 is considered as the primary contactor. If the
within preset period after
is issued immediately to trip CB2 as backup.
CB1 <- CB2
- CB2 is considered as the primary contactor. If the
within preset period after
is issued immediately to trip CB1 as backup.
CB1 <-> CB2
- both CBs provide a backup switching for each other. If the
deactivate in preset period, CB2 is tripped, if the
doesn't come in preset period, CB1 is
tripped.
