Areva MiCOM P921 - Page 140

P92x/EN FT/E11 Technical Guide
User Guide
Page 62/110 MiCOM P921-P922-P923
11.3 "BLOCKING LOG1 t" Menu
11.3.1 Description
The principle of the blocked overcurrent protection involves the use of start contacts
from downstream relays (P121 or P122 for example) wired onto blocking inputs of
upstream relays (P921, P922 or P923 for example).
In the MiCOM P921 or P922-P923, the “BLOCKING LOGIC1 t” and “BLOCKING
LOGIC2 t” sub-menus allow the user to select time-delayed information, which will
be blocked by a dedicated logic input (see “INPUTS” sub-menu, “BLOCK LOG1” or
“BLOCK LOG2” input).
In order to block one information, please go to the relevant cell corresponding to the
selected information, press then the 5 key. Select the configuration (YES or NO) with
the 2 and 8 keys. Validate with the 5 key.
11.3.2 MiCOM P921-P922 and P923 : common information
To gain access to the “BLOCKING LOG1 t” sub-menu from the default display, press
2 once, 6 5 times (P921) or 6 times (P922-P923), 2 once and 6 twice.
BLOCKING LOG1 t
Heading of the “BLOCKING LOGIC 1” sub-menu
BLOCK1 tV<=
NO
Description : selection of the time-delayed information “tV<”,
which will be blocked by energisation of the “BLK LOG1” logic
input.
Range : YES/NO
BLOCK1 tV<<=
NO
Description : selection of the time-delayed information
“tV<<”, which will be blocked by energisation of the “BLK
LOG1” logic input.
Range : YES/NO
BLOCK1 tV<<<=
NO
Description : selection of the time-delayed information
“tV<<<”, which will be blocked by energisation of the “BLK
LOG1” logic input.
Range : YES/NO
BLOCK1 tV>=
NO
Description : selection of the time-delayed information “tV>”,
which will be blocked by energisation of the “BLK LOG1” logic
input.
Range : YES/NO
BLOCK1 tV>>=
NO
Description : selection of the time-delayed information
“tV>>”, which will be blocked by energisation of the “BLK
LOG1” logic input.
Range : YES/NO
BLOCK1 tV>>>=
NO
Description : selection of the time-delayed information
“tV>>>”, which will be blocked by energisation of the “BLK
LOG1” logic input.
Range : YES/NO
BLOCK1 tV0>=
NO
Description : selection of the time-delayed information “tV0>”,
which will be blocked by energisation of the “BLK LOG1” logic
input.
Range : YES/NO
BLOCK1 tV0>>=
NO
Description : selection of the time-delayed information
“tV0>>”, which will be blocked by energisation of the “BLK
LOG1” logic input.
Range : YES/NO