Inteli NT MINT, SW Version 2.6, ©ComAp – November 2011
IGS-NT-MINT-2.6-Reference Guide.PDF
109
Step:
1 X
Range:
-32000 – 32000 X
Load shedding
Ld shed active
[DISABLED / ISLAND ONLY /
ISL+TRIP
PARAL
/
ALL
THE
TIME]
(FV)
DISABLED
Load shedding is switched off at all
ISLAND ONLY Load shedding is active only in island operation; before GCB closing all the LdShed
outputs get closed; in parallel operation with mains is always switched off
ISL+TRIP PARAL The same functionality as ISLAND ONLY, but in additional it closes all the LdShed outputs
during the power failure ( =change from parallel to island operation); according to the Load
in island operation it can be potentially reconnected beck
ALL THE TIME Load Shedding works only according to gen-set Power, it works without reference to
operation type (island, parallel or any transitions)
Force value possibility: Yes
Ld shed level
[ % ] (FV)
When gen-set load exceeds this level for more than
Ld shed delay
time, controller proceeds to the next Load
shedding stage - the next binary output Load shed x is closed.
Step:
1 % of
Nomin power
Range:
Ld recon level
- 200 % of
Nomin power
Force value possibility: Yes
Ld shed delay
[ s ] (FV)
Time delay for
LD shed level
limit.
Step:
0,1 s
Range:
0,0 – 600,0 s
Force value possibility: Yes
Ld recon level
[ % ] (FV)
When gen-set load drops under this level for more than
Ld recon delay
time, controller proceeds to the lower
Load shedding stage. The binary output for higher stage is opened (Load shed x). Automatic load
reconnection works only when
AutoLd recon
= ENABLED.
Step:
1 % of
Nomin power
Range:
0 -
Ld shed level
Force value possibility: Yes
Ld recon delay
[ s ] (FV)
The amount of time that the load has to be under
Ld recon level
before the next part of the load is
reconnected.
Step:
1 s
Range:
0 - 600 s
Force value possibility: Yes
AutoLd recon
[ DISABLED / ENABLED ]
(FV)
Switch between manual and automatic reconnection of shedded load.
DISABLED
Rising edge on binary input
MAN load recon
resets controller to the lower stage, but only if
the load is under the
Ld recon level
.
Ld recon delay
is not important in this case.
ENABLED
Load reconnection is automatic and depends on setpoints
Ld recon level
and
Ld recon
delay
. Binary input MAN load recon has no function.
Force value possibility: Yes
Hint:
To understand Load shedding better see diagrams in section Load shedding (page 10 and 11).