ZIV 7IRD-A, Инструкция по эксплуатации

Страница: 131 / 180

Chapter 9. Local Interface: Graphic Display
9-11
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
This indication is eliminated automatically after five (5) seconds, and no operation may be
performed during this period of time. When it is impossible to classify the reason why an order
cannot be executed under either of the two texts above, the second line of text does not appear,
leaving only the indication of
ORDER NOT EXECUTABLE . The possible causes for which a
local order is not executable are the following:

An order to put the device into a state in which it already is has been selected (for
example, an order to close a Breaker that is already closed). In this case, nothing will be
indicated in the second line.

The position is selected in Remote Control .

An order to Close a switch is attempted, and it is selected as Discharge .

As a consequence of the unit's internal Logic process, the activation of an interlocking
that prevents the execution of the order is detected. These interlockings correspond to
the generation of internal Logic Signals of independent permissions to
Open or Close for
each of the devices. In the generation of the permissions to close or open, combinations
of Digital Inputs of the unit are used in conjunction with internal Logic Signals generated
from field Digital Inputs, Internal States of the units, Internal Signals from Protection and
the Measurement Module, as well as Internal Signals from the Central Unit through the
Communications Protocol.
Once it has been checked that the order can be executed, the Auxiliary Output Contacts
corresponding to the order selected are activated. After the order has been executed, the unit
checks the proper execution of the order through the monitoring of the Digital Inputs or Internal
Logic Signals. If, after a given interval of time has transpired (selectable for each device), it is
detected that the order has failed, the display shows an
ORDER FAILURE message of the
same characteristics as previously indicated. If the order has been executed properly, the unit
sends no indication to the exterior.
9.4.2 Procedure for Opening/Closing Breakers and Disconnecting Switches
The procedure for opening or closing Breakers or Disconnecting Switches is the same for both,
and follows the general procedure established above. As a consequence of the operations, an
Output Signal is activated and presented on the Digital Outputs Screen (depending on the
model).
After the execution of an order, as the last action, and depending on the outcome produced, a
message is sent to the Central Unit through communications following the Communications
Protocol implemented (
PROCOME, DNP3, ... ) (as indicated in Chapter 7). The messages sent
are the following:
- Change of state of the device upon which the order is executed.
-
Order Failure signal if such is the outcome.
- Order Executed signal.