96
Instantaneous overcurrent protection
(IOC)
&KDSWHU
9HULI\LQJVHWWLQJVE\VHFRQGDU\
LQMHFWLRQ
,QVWDQWDQHRXVRYHUFXUUHQWSURWHFWLRQ,2&
Prepare the terminal for verification of settings as outlined in section “Preparing for
test” in this chapter.
To verify the settings the following fault type should be tested:
•
One for a phase-to-earth fault
Ensure that the maximum continuous current of the terminal does not exceed four times
its rated value.
0HDVXULQJWKHRSHUDWHOLPLWRIVHWYDOXHV
3KDVHRYHUFXUUHQWSURWHFWLRQ
3URFHGXUH
,QMHFWDSKDVHFXUUHQWLQWKHWHUPLQDOZLWKVWDUWEHORZWKHVHW
WLQJYDOXH
,QFUHDVHWKHLQMHFWHGFXUUHQWLQWKH/
Q
SKDVHXQWLOWKH
,2&75/
Q
Q
VLJQDODSSHDUV
6ZLWFKRIIWKHIDXOWFXUUHQW
Observe the maximum permitted overloading of the current cir-
cuits in the terminal.
&RPSDUHWKHPHDVXUHGRSHUDWLQJFXUUHQWZLWKWKHVHWYDOXH
5HVLGXDORYHUFXUUHQWSURWHFWLRQQRQGLU
3URFHGXUH
,QMHFWDSKDVHFXUUHQWLQWKHWHUPLQDOZLWKVWDUWEHORZWKHVHW
WLQJYDOXH
,QFUHDVHWKHLQMHFWHGFXUUHQWLQWKH/
Q
SKDVHXQWLOWKH
,2&751VLJQDODSSHDUV
6ZLWFKRIIWKHIDXOWFXUUHQW
Observe the maximum permitted overloading of the current cir-
cuits in the terminal.
&RPSDUHWKHPHDVXUHGRSHUDWLQJFXUUHQWZLWKWKHVHWYDOXH
Summary of Contents for REL 551 2.3 Series
Page 16: ...10 Note signs KDSWHU 6DIHW LQIRUPDWLRQ ...
Page 44: ...38 Checking the binary I O circuits KDSWHU KHFNLQJ WKH H WHUQDO FLUFXLWU ...
Page 52: ...46 Checking the self supervision signals KDSWHU QHUJLVLQJ WKH WHUPLQDO ...
Page 140: ...134 Testing the interaction of the distance protection KDSWHU 7HVWLQJ WKH SURWHFWLRQ V VWHP ...