InteliPro, SW version 1.0, ©ComAp – May 2011
InteliPro Application Guide
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 cicrcuit 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 connection device 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 controled 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 "Priority switching" functionality. It is not practical to use the
Comm Trp output in this case. To distinguish between the 2 breakers, outputs Trip 1 and Trip
2 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 in the appropriate group of protection setting is
used for this assignment. By this setting, the output Trip 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 Trip 1,
the CB1 feedback is expected to deactivate. The same applies for Trip 2: in case of activation
of Trip 2, the CB2 feedback is expected to deactivate.
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 Operation mode
with 2 trip outputs).
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 connection device of the generator to the mains. In ComAp
products, this breaker is called "Mains Circuit Breaker" = MCB.
• CB2 is considered as a supplementary connection device on the power connection between
generator and mains. There can be specific protection functions assigned the 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.
• As both circuit breakers are equivalent, it is 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 General: Prio Switching, the following backup function is provided:
DISABLED - no CB backup is provided
CB1 -> CB2 - CB1 is considered as the primary switch. If the feedback is not deactivated within preset
period after Trp 1, the output Trp 2 is issued immediately to trip CB2 as backup. Bak Trp 1 is issued at
the same time.
CB1 <- CB2 - CB2 is considered as the primary switch. If the feedback is not deactivated within preset
period after Trp 2, the output Trp 1 is issued immediately to trip CB2 as backup. Bak Trp 2 is issued at
the same time.
CB1 <-> CB2 - both CBs provide a backup switching for each other. If the CB1 feedback doesn't
deactivate in preset period, CB2 is tripped, if the CB2 feedback doesn't come in preset period, CB1 is
tripped.
To Next Page
Loading...
Need help?
General
