19
Example 8
Setting of the interlocking logic. The configu-
ration is the same as in example 3. The circuit
breaker is to be controlled.
The following rules are given for the interlock-
ing:
- Opening of the circuit breaker is always al-
lowed.
- Closing of the circuit breaker is allowed when
the circuit breaker truck is in the isolating po-
sition or in the service position and the earth
switch is open.
Instead of these written interlocking conditions,
the following logic diagram can be used:
Fig. 11. Simplified logic diagram for the inter-
locking logic in example 8.
Below a detailed logic diagram is drawn.
Fig. 12. Detailed logic diagram of the interlock-
ing logic in example 8.
The program commands are written on the ba-
sis of the detailed logic diagram. As a default
the program area M200...M300 is filled with
END commands. The operator overwrites these
END commands with the actual interlocking
program.
A configuration was set in example 3. If the
interlockings described above are to be used the
setting continues with the following commands.
>99WM200:LOAD 61:XX
; Read the value of special register 61
(the value is always 1)
>99WM201:OUT 20:XX
; Always enable open command of CB
>99WM202:LOAD 1:XX
; Read the service status of CB truck
>99WM203:AND 203:XX
; Read the open status of earth switch
>99WM204:OR 201:XX
; Read the isolated status of CB truck
>99WM205:OUT 21:XX
; Enable the close command of CB
>99WM206:END:XX
; End of interlocking program
>99WS198:1:XX
; Change interlocking program into run
mode
>99WS199:1:XX
; Starts interlocking program
>99WV151:1:XX
; Store the set parameters
The program is automatically compiled, when
the operation mode is re-entered. If syntax er-
rors are detected in the program, the compiling
will not be performed and the interlocking pro-
gram remains in the setting mode. When the
syntax errors have been corrected the interlock-
ing program can be changed to operation mode.
The interlocking program can be by-passed in
two ways:
- For testing purposes the switch SG1/1 on the
front panel can be turned into position 1. Then
the interlocking program is interrupted and
opening/closing of an object is always enabled.
- If the interlocking logic is to be taken out of
use permanently, variable S199 is set to 0.
Then opening or closing of an object is al-
ways enabled.
The interlocking program does not affect the
tripping signal of the protection module.
1
&
1
Always
Enable CB opening
ES OPEN
CB truck in service
CB truck isolated
Enable CB oclosing
1
&
1
61
20
Enable CB opening
203
1
201
21
Enable CB oclosing
