Status Recognition And Monitoring Of The Circuit Breaker - Siemens 7SC80 Manual

Functions
2.14 Automatic Reclosing System 79
•
The circuit breaker is not ready after the breaker monitoring time has elapsed, provided that the circuit
breaker check has been activated (address 7113 CHECK CB? = Chk each cycle, indicated by
CBreadyExp ).
•
The circuit breaker is not ready after maximum extension of the dead time Max. DEAD EXT.. The moni-
toring of the circuit breaker status can cause undesired extension of the dead time. To prevent the auto-
matic reclosing function from assuming an undefined state, the extension of the dead time is monitored.
The extension time is started when the regular dead time has expired. When it has elapsed, the auto-
matic reclosing function is blocked dynamically and the lock-out time launched. The automatic reclosing
function resumes the idle state when the lock-out time has elapsed and new blocking conditions do not
apply (indicated by
•
Manual closing has been detected (externally) and parameter BLOCK MC Dur. (T ≠ 0) was set so that
the automatic reclosing function responds to manual closing.
•
Via a correspondingly routed binary input (FNo. 2703
automatic recloser is in normal state, the latter will be blocked statically (
blocking is terminated immediately when the binary input has been cleared and the automatic reclosure
function resumes normal state. If the automatic reclosure function is already running when the blocking
arrives, the dynamic blocking takes effect (
starts the dynamic blocking time SAFETY 79 ready. Upon its expiration, the device checks if the binary
input is still activated. If this is the case, the automatic reclosure program changes from dynamic blocking
to static blocking. If the binary input is no longer active when the time has elapsed and if no new
blocking conditions apply, the automatic reclosure system resumes normal state.

Status Recognition and Monitoring of the Circuit Breaker

2.14.3
Circuit Breaker Status
The detection of the actual circuit breaker status is necessary for the correct functionality of the automatic
reclosure function. The circuit breaker status is detected by the circuit breaker auxiliary contacts and is
communicated to the device via binary inputs 4602
Here the following applies:
•
If binary input 4601
detect whether the circuit breaker is open, closed or in intermediate position. If both auxiliary contacts
detect that the circuit breaker is open, the dead time is started. If the circuit breaker is open or in inter-
mediate position without a trip command being present, the automatic reclosure function is blocked
dynamically if it is already running. If the automatic reclosure system is in normal state, it will be blocked
statically. When checking whether a trip command applies, all trip commands of the device are taken into
account irrespective of whether the function acts as starting or blocking element on behalf of the auto-
matic reclosure program.
•
If only the binary input 4601
is not active. If the binary input gets inactive while no trip command of (any) function applies, the auto-
matic reclosure function is blocked. The blocking will be of static nature if the automatic reclosure func-
tion is in normal state at this time. If the automatic reclosing function is already running, there will be a
dynamic blocking. The dead time is started if the binary input gets inactive following the trip command of
a starting element (4601
detected for this type of allocation.
274
79 TdeadMax Exp ).
79 DynBlock ). In this case, the activation of the binary input
>52-a and binary input 4602 >52-b are used, the automatic reclosure function can
>52-a is allocated, the circuit breaker is considered open if the binary input
>52-a = inactive). An intermediate position of the circuit breaker cannot be
>BLOCK 79 ). If the blocking takes places while the
79 is NOT ready ). The
>52-b and 4601 >52-a .
E50417-G1140-C486-A8, Edition 07.2017
79 T-
SIPROTEC Compact, 7SC80, Manual