Page 185 - Practical Power System and Protective Relays Commissioning

186 Practical Power System and Protective Relays Commissioning

SCL and IEC 61850 define the substation/system configuration descrip-
tion testing.
This is done using the following tools:
Diagnostic tool: these isolate the cause of the problem which is detected
by self-monitoring supervision of the system or the problem detected dur-
ing testing process.
Simulation tool: these simulate the conditions and signals to test the
system.
Documentation tool: reports the results in a SCD file.
In general the commissioning procedures for the protection and control
systems based on IEC 61850 can be done as follows:

1. The tests which can be classified as secondary tests in conventional
system:
a. Relay (IED) testing as normal conventional system.
b. Relay isolation (blocking of relay outputs for trip signals) by a
manual command that puts the relay into test isolated mode then all
commands from the IED (relay) going through the process bus will
be disabled. At that moment the relay screen will show the LED in
service in red or “off” position.
c. Connect the relay injecting set to the substitute merging units after
disconnecting the original merging units which connect the primary
equipment in switchgear to the relay. Put the relay in test-substituted
mode to test the relay through its input fibers and substitute merging
units.
d. Relay restoration to service: reconnect the fiber cables of the
original merging units of the relay and put the relay into “In service
mode.”
2. The tests which can be classified as primary tests in conventional
systems/merging unit/primary equipment:
a. Use a temporary relay and inject the primary equipment with primary
or secondary injection and note the values measured by the temporary
relay.
b. Issue the commands from the temporary relay to the CB and check
the operation of the CB in the switchgear.
c. Note any alarms or signals coming from the CB to the temporary
relay.
See also Fig. 17.3.
3. Final test of SAS (Substation Automation System)
a. Test the total automation system of substation by issue the manual
tripping orders and closing orders to the CB through human machine
interface to the substation automatic system.