Conjunctive Tests; Protection Scheme; Metering And Recording; On Load Test - Toshiba GRE110 Instruction Manual

6.5.2 Protection Scheme

In the protection scheme tests, a dynamic test set is required to simulate power system pre-fault,
fault and post-fault conditions.
Tripping is observed with the tripping command output relays.
Circuit Breaker failure tripping
• Set the scheme switch [BTC] to "ON" and [RTC] to "DIR" or "OC".
• Apply a fault, retain it and input an external trip signal. Check that the retrip output relays
operate after the time setting of the TCBF1 and the adjacent breaker tripping output relay
operates after the time setting of the TCBF2.

6.5.3 Metering and Recording

The metering function can be checked while testing the AC input circuit. See Section 6.4.4.
Fault recording can be checked while testing the protection schemes. Open the "Fault" screen and
check that the descriptions are correct for the fault concerned.
Recording events are listed in Appendix C. There are internal events and external events by binary
input commands. Event recording on the external event can be checked by changing the status of
binary input command signals. Change the status in the same way as the binary input circuit test
(see Section 6.4.2) and check that the description displayed on the "Event" screen is correct. Some
of the internal events can be checked in the protection scheme tests.
Disturbance recording can be checked while testing the protection schemes. The LCD display only
shows the date and time when a disturbance is recorded. Open the "Disturbance" screen and check
that the descriptions are correct.
Details can be displayed on the PC. Check that the descriptions on the PC are correct. For details on
how to obtain disturbance records on the PC, see the RSM100 Manual.

6.6 Conjunctive Tests

6.6.1 On Load Test

To check the polarity of the current transformers, check the load current with the metering displays
on the LCD screen.
• Open the "Auto-supervision" screen check that no message appears.
• Open the following "Metering" screen from the "Status" sub-menu to check the load current.
/ 2 M e t e r i
I a *
I b *
I c *
I e *
I 1 *
I 2 *
I 2 / I 1 *
T H M *
I a m a x *
 172 
n g
* . * * k A
* . * * k A
* . * * k A
* . * * k A
* . * * k A
* . * * k A
* . * *
* * . * %
* . * * k A
6 F 2 T 0 1 7 2