Advertisement
Device
Circuit
breaker
Device status
(CB)
Dis-
connector
(DS)
Device control
Other IE Ds
GOOSE
transmission
data
ILK specification
4.4.1
Maximum number of interlock-checks
(i)
Since the maximum number of interlock-checks is 83, ILK can be used to supervise 83 control
devices. An interlock-check can include up to 500 nodes; an interlock operator and input/output
signals are configured for each node; a node can accept up to 64 input signals. (Nodes are
discussed separately. See Chapter 4.4.3)
GOOSE receiving information
(ii)
When an interlock-check is required to determine an "OK/NG-decision", the interlock-check
function collects the device status from all of the other IEDs during the interlock-check process.
In this case, GOOSE subscription information is used to acquire the device status required;
configuration of the interlock-check formula, including quality information corresponding to
other IEDs and GOOSE, is necessary.
Interlock-check formula
4.4.2
Figure 4.4-2 shows a device (Q0) in the feeder bay, if a control action to operate (Q0) is required,
an interlock-check will be necessary. To control the device (Q0), the interlock-check must verify
the status of several devices in the busbar and the bay.
IED
Binary
input
Device status
circuits
Binary
Output
circuits
Control
GOOSE
GOOSE receiving information
subscription
data
Figure 4.4-1 Interlock–check process
- 581 -
Control
Functions
Device status
DPOS
OK/ NG decision
PC(GR-TIEMS)
Interlock formulas
6F2T0207 (0.01)
Interlock Control
Function (ILK)
Interlock
Database
GRE200 (5,6)
Advertisement
