Section 7
1MAC050144-MB C
Control functions
490
615 series ANSI
Technical Manual
• Str 3 delay shot 2
• Str 3 delay shot 3
• Str 3 delay shot 4
Time delay settings for the
DEL_INIT_4
signal are as follows:
• Str 4 delay shot 1
• Str 4 delay shot 2
• Str 4 delay shot 3
• Str 4 delay shot 4
Normally, only two or three reclose attempts are made. The third and fourth times are used
to provide the so called fast final trip to lockout.
Figure 262:
Autoreclose configuration example
Delayed
DEL_INIT_2...4
signals are used only when the autoreclose shot is initiated
with the pickup signal of a protection stage. After a pickup delay, the AR function opens
the circuit breaker and an autoreclose shot is initiated. When the shot is initiated with the
trip signal of the protection, the protection function trips the circuit breaker and
simultaneously initiates the autoreclose shot.
If the circuit breaker is manually closed against the fault, that is, if SOTF is used, the fourth
time delay can automatically be taken into use. This is controlled with the internal logic of
the AR function and the
Fourth delay in SOTF
parameter.
A typical autoreclose situation is where one autoreclose shot has been performed after the
fault was detected. There are two types of such cases: operation initiated with protection
pickup signal and operation initiated with protection trip signal. In both cases, the
autoreclose sequence is successful: the reclaim time elapses and no new sequence is
started.
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
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Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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