Toshiba GR 200 Series, Instruction Manual

Page: 723 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 702 -
Prior to controlling a device, the interlock-check function is used to determine whether the
control of a device is correct or not. If the interlock-check finds that the conditions for device
control have not been satisfied in accordance with the appropriate interlock condition, control
of the device is forbidden. Figure 4.7-1 provides an overview of the interlock-check process.
Formulae for interlock-check are stored in an ILK database; these formulae are used in order
to enable the interlock-check function to output a decision. If the proposed operation of a
particular device is deemed correct then an “OK-decision” is determined by the formulae, and
device control is allowed. However, if the proposed operation of the device is deemed incorrect
then an “NG-decision” is determined by the formulae, and device control is not allowed.
Control
Functions
Interlock
Database
IED
Binary
input
circuits
Device status
Circuit
breaker
(CB)
Dis-
connector
(DS)
Device status
Interlock Control
Function (ILK)
Device
GOOSE
transmission
data
Other IE Ds
GOOSE receiving information
OK/NG decision
Binary
Output
circuits
Device control
Control
GOOSE
subscription
data
Interlock formulas
PC(GR-TIEMS)
SPOS
DPOS
and
others
Device status
Figure 4.7-1 Interlock–check process
4.7.1
ILK specification
(i)
Maximum number of interlock-checks
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 section 4.7.3)
(ii)
GOOSE receiving information
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