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Time delayed phase and residual
overcurrent protection (TOC1)
TEST
TEST-ACTIVE
BlockTOC1
TOC1-BLOCK
Backup
TOC1-RELEASE
Independ
IL1
IL2
IN
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RYHUFXUUHQW SURWHFWLRQ IXQFWLRQ
&DOFXODWLRQV
6HWWLQJ LQVWUXFWLRQV IRU SKDVH RYHUFXUUHQW IXQFWLRQ ,!
The parameters for the time delayed phase and residual overcurrent function are set via
the local HMI or PST (Parameter Setting Tool). Refer to the Technical reference man-
ual for setting parameters and path in local HMI.
The current setting value must be selected to permit the detection of the lowest short
circuit current without having any unwanted tripping or starting of the function under
high load conditions. The following relation has to be considered for the setting of the
primary operating current (Is) of the function:
&
Aˆp‡v‚Ã@hiyr
≥1
&
&
I>
≥1
I>
IN>
≥1
&
t P
TOC1-TRP
&
t N
TOC1-TRN
en02000531.v sd
&KDSWHU
&XUUHQW
87
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