![ABB Relion REQ650 Скачать руководство пользователя страница 47](http://html1.mh-extra.com/html/abb/relion-req650/relion-req650_commissioning-manual_3400279047.webp)
Do not switch off the auxiliary power supply to the IED before changes,
for example, setting parameter or local/remote control state changes are
saved.
A mechanism for limiting the number of writings per time period is included in the IED
to prevent the flash memory to be worn out due to too many writings. As a consequence
it may take up to an hour to save changes. If the auxiliary power is interrupted before a
change is saved, that change is lost.
5.2
Activating the test mode
Put the IED into the test mode before testing. The test mode blocks all protection functions
and some of the control functions in the IED, and the individual functions to be tested can
be unblocked to prevent unwanted operation caused by other functions. In this way, it is
possible to test slower back-up measuring functions without the interference from faster
measuring functions. The busbar differential protection is not included in the test mode
and is not prevented to operate during the test operations. The test switch should then be
connected to the IED.Test mode is indicated when the yellow PickupLED flashes.
1.
Select
Main menu/Tests/IED test mode/TESTMODE:1
2.
Set parameter
TestMode
to
Enabled
.
3.
Save the changes.
As a consequence, the yellow pickupLED starts flashing as a reminder and remains
flashing until the test mode is switched off.
5.3
Preparing the connection to the test equipment
The IED can be equipped with a test switch of type RTXP8, RTXP18 or RTXP24 or FT.
The test switch and its associated test plug handles are a part of the COMBITEST or FT
system of ABB, which provides secure and convenient testing of the IED.
When using the COMBITEST, preparations for testing are automatically carried out in the
proper sequence, that is, for example, blocking of tripping circuits, short circuiting of
CT’s, opening of voltage circuits, making IED terminals available for secondary
injection. Terminals 1 and 8, 1 and 18 as well as 1 and 12 of the test switches RTXP8,
RTXP18 and RTXP24 respectively are not disconnected as they supply DC power to the
protection IED. When FT switch is used for testing, care shall be exercised to open the
tripping circuit, ahead of manipulating the CT fingers.
1MRK 505 293-UUS A
Section 5
Testing IED operation
39
Commissioning manual