Section 5
1MAC050144-MB C
Protection related functions
390
615 series ANSI
Technical Manual
Figure 190:
Back-up trip logic internal design
The current detection characteristics can be selected with the
CB failure trip mode
setting
in three following options:
• "1 out of 3" in which detecting opening failure (high current) in one phase only is
sufficient
• "1 out of 4" in which detecting opening failure (high current) or high ground current
in one phase only is sufficient
• "2 out of 4" in which at least two high currents (phase current and/or ground current)
are required for breaker failure detection.
In most applications, "1 out of 3" is sufficient. In the "Breaker status" mode, the back-up
trip is done when the status inputs indicate that the circuit breaker is in closed state.
The setting
CB failure mode
is used to select the mode the breaker fault is detected with.
In "Current" mode, the detection is based on the current level exceeding. In "Breaker
status" mode, the detection is based on the closed position of the circuit breaker after a trip
signal is issued, that is, after a long duration of the trip signal. In "Both" mode, the
detection is based either on the exceeding of the
Current value Res
level, depending on the
current detection mode, or on the long duration of the trip signal. When external
information on a circuit breaker fault is connected to the active
CB_FAULT
input, the
back-up trip function is issued to the upstream breaker without delay. The blocking is used
for disabling the whole function.
Timer 1
Once activated, the timer runs until the set
Retrip time
value has elapsed. The time
characteristic is according to DT. When the operation timer has reached the maximum
time value, the
TRRET
output is activated. A typical setting is 0 - 50 ms.
Содержание 615 Series ANSI
Страница 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Страница 2: ......
Страница 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
Страница 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
Страница 712: ......