'(& )( )'& &) ( &!& ")& &$(( $# Ć %&( $# #)" &&#$
6 - 18
Siemens AG ⋅ May 1998
6.2.4.3.2 Settings for isolator supervision
"
A
6 3 0 1 I S O T R A T I M
= 7 . 0 0 s
Isolator operating time
minimum setting: 1.00 s.............
maximum setting: 180.00 s...........
"
A
6 3 0 2 I S O M A L R E S
= a l a r m o n l y
Protection response for isolator mal-function
(supervision criteria: running time, breaker faulty and
auxiliary voltage failure)
= alarm only
("ISOyFlt:Axx", "ISOyFlt run:Axx" or "Aux
voltflt:Axx").
= Block w aut rel (Blocking with automatic release)
Upon recognition of an isolator failure, the protection
is blocked and the failure is signalled.
Blocking is automatically cancelled when the isolator
failure no longer persists
= Block w store (Blocking with storage)
Upon recognition of an isolator failure, the failure is
signalled and the protection is blocked. Blocking is
cancelled only when the failure does not exist any
longer and the blocking is acknowledged via operaĆ
tion (DA 8600/ZE) or via binary input "BloISOFlĆ
tRel" (BE5/ZE).
6.2.4.3.3 Settings for linearized current transformĆ
ers
"
A
6 3 0 9 Z E R O C R S U P
= a c t i v e
Zero crossing supervision
= inactive
= active
After an external fault has been switched off by an
external protection device, a demagnetizing DC comĆ
ponent may be present in linearized CT's (TPZ-cores),
which resembles an internal fault.
In order to avoid unwanted tripping, the differential
current can be monitored to detect a plain DC compoĆ
nent. Release of the zero crossing supervision is a
prerequisite.
"
A
6 3 1 0 I > Z E R O C R
= . 5 0 I / I n o
Threshold of the differential current for checking the
current zero crossing
minimum setting: 0.20 /
no
...........
maximum setting: 4.00 /
no
...........
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