ABB RELION REX640 Technical Manual page 1408

Condition monitoring functions
For example, if Generator 2 is connected to busbar2 and the busbar2 connects
to busbars 1 and 3 through tie breakers 1 and 2 as shown in
the status of tie breaker1 shall be received through inputs TIE_A_CLOSED and
TIE_A_OPEN and the status of tie breaker 2 is shall be received as TIE_B_CLOSED
and TIE_B_OPEN.
If one of the tie breakers of the generator under consideration is not configured
or connects to a non-configured busbar, then the module expects the status of the
other tie breaker through inputs TIE_B_CLOSED and TIE_B_OPEN.
The inputs GEN1_DATA to GEN8_DATA are received from other generators in the
system. Each of these inputs contain information on the status of GCB, status of
the adjacent tie breakers, governor and Automatic Voltage Regulator (AVR) modes,
generator local mode status, backup protection status, fault status and tie breaker
trip failure indication in the respective generators from where the information is
being received.
The setting
on this setting the local active/reactive power, circuit breaker statuses, governor
and excitation system information are associated to the corresponding generator.
Based on this information, the Topology determination module determines the
different subnetwork groups. Each network group is assigned a network number
which is the lowest busbar number in the sub group.
For example in
the subnetwork number of this group is 5.
If an element is not electrically connected to any busbar, then a zero subnetwork
number is assigned. The DGMGAPC function will be disabled in those networks
whose subnetwork number will be zero.
When the quality bit of local GCB status input indicates that the data is not reliable,
then the corresponding breaker status is considered open and rest of the modules
in the function are disabled. If the quality bits of the local tie breakers status
indicate that data is not reliable, then that tie breaker is considered as open and the
generators connected through that tie breaker are suspended from participating in
the monitoring function.
In case the quality of the status of the adjacent tie breakers are not reliable, then the
module may identify the status of the same tie breaker using the data received from
the adjacent generator sharing the same tie breaker.
The subnetwork numbers of eight generators are available in monitored data
SBNW_GEN1 to SBNW_GEN8. The subnetwork numbers of tie breakers are available
in monitored data SBNW_TIE_CB1 to SBNW_TIE_CB8.
If the inputs GEN1_DATA ... GEN8_DATA indicate that a network generator is
faulty, then it is indicated in the respective monitored data output FAULT_GEN1 ...
FAULT_GEN8 and the data corresponding to those generators are not used in other
modules of DGMGAPC.
1408
Local generator Num is used to set the local generator number. Based
Though 8 inputs, GEN1_DATA ... GEN8_DATA, are provided to receive
information from other generators, the input corresponding to the local
generator need not be connected.
Local generator Num is set to "5", then GEN5_DATA needs to be
That is, if
left unconnected and any information connected to this input would not
be used by the function.
Figure 798
(c), the subnetwork group has busbar 5, 6, 7 and 8. Hence
1MRS759142 F
Figure 796
. Then
REX640
Technical Manual