ABB REL 551 2.3 Series - Definite and Inverse Time-Delayed Residual Overcurrent Protection (TEF)

89
Definite and inverse time-delayed
residual overcurrent protection (TEF)
&KDSWHU
9HULI\LQJVHWWLQJVE\VHFRQGDU\
LQMHFWLRQ
)LJXUH 0HDVXULQJFKDUDFWHULVWLFRIWKHGLUHFWLRQDOHOHPHQW
 7RDFWLYDWHWKHGLUHFWLRQDOIXQFWLRQVHW'LUHFWLRQ 'LUHFWLRQ
DO
 6HWWKHSRODULVLQJYROWDJHWRRI8
E
DQGWKHSKDVHDQJOHEH
WZHHQYROWDJHDQGFXUUHQWWR
 &KHFNWKHRSHUDWHFXUUHQWRIWKH,0LQIXQFWLRQ
The function activates the TEF--START output.
 :KHQLQGHSHQGHQWWLPHGHOD\GHILQLWHLVVHOHFWHGFKHFNWKH
RSHUDWHWLPHRIWKHWWLPHUE\LQMHFWLQJDFXUUHQWWZRWLPHV
WKHVHW,0LQRSHUDWHYDOXH
When inverse time delay is selected, check the operate time at
three points of the inverse characteristic. The formulas for operate
time for different types of inverse time delay curves are shown in
table
10 "Operate time formulas".
IN>Dir
IN Operation
Upol = -3U
0
99000052.vsd
65°
ϕ