ZIV 7IRD-A, Инструкция по эксплуатации

Страница: 132 / 180

Chapter 9. Local Interface: Graphic Display
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
9-12

Opening or Closing Three-Position Disconnectors
Three-Position Disconnectors are analyzed as if they were two Two-Position Disconnecting
Switches, one on Ground and another on Busbars, represented by two superposed, selectable
symbols like any other device. Therefore, follow this procedure to manoeuvre on a Three-
Position Disconnector:
With the
NXT key, select the relevant disconnecting switch: Busbar Disconnector or Ground
Breaker . The opening and closing operations are performed according to the general procedure
described above.
The procedure is identical to that followed by a Two-Position Disconnecting Switch, the only
difference being that the Three-Position Disconnector is achieved by associating different,
selectable Two-Position Disconnecting Switches.
9.4.3 Procedure for Placing a Breaker in Discharge
To place or remove the Discharge of a Breaker. follow these steps: from the Graphic Display in
default state, select the relevant Breaker with the function key NXT . Before 30 s transpire, press
the function key TAG to discharge. If the breaker was considered without Discharge , the unit
checks if the Breaker is open, in which case it allows putting it in Discharge . Should the
Breaker be in a state other than open , the unit indicates ORDER NOT EXECUTABLE .
Once the Breaker has been placed in
Discharge , a D appears next to the Breaker. At the same
time, the corresponding incident is generated and sent to the Central Unit through the protocol
implemented (
PROCOME, DNP3, ... ).
Should the Breaker be placed in the situation of without
Discharge , the D signal is eliminated
from the display, and the change-of-state incident of the corresponding digital signal is
generated to be transmitted through the protocol.
The
Discharge state will only affect the Breakers as defined in the Configuration, which is
generally as follows:

In Discharge : the control module will deny orders to close the Breaker that originate
locally or come from the Central Unit.

Without Discharge : any kind of order may be given depending on the state of the
Breaker.
The
Discharge state can only by implemented when the Breaker is already open. This order to
Discharge can come from the Control Panel or originate locally. An element can exit the
Discharge state no matter what position the Breaker is in: Open , Closed or Unknown .
In some configurations, as a consequence of the position passing into the
Discharge state, an
interlocking must be triggered, which will provoke the continued opening or closure of a Digital
Output (for example, obstruction to operating on disconnecting switches, etc.).