172
Automatic reclosing function (AR)
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Automatic reclosing (AR) is a well-established method to restore the service of a power
line after a transient line fault. The majority of line faults are flashover arcs, which are
transient by nature. When the power line is switched off by operation of line protection
and line breakers, the arc de-ionises and recovers voltage withstand at a somewhat vari-
able rate. So a certain line dead time is needed. But then line service can resume by the
auto-reclosing of the line breakers. Select the length of the dead time to enable good
probability of fault arc de-ionisation and successful reclosing.
For the individual line breakers and auto-reclosing equipment, the Auto-reclose open
time (AR open time) expression is used. At simultaneous tripping and reclosing at the
two line ends, Auto-reclose open time equals approximaltely the dead time of the line.
Otherwise these two times may differ.
In case of a permanent fault, the line protection trips again at reclosing to clear the fault.
Summary of Contents for REO 517
Page 10: ... RQWHQWV ...
Page 16: ...6 Introduction to the application manual KDSWHU QWURGXFWLRQ ...
Page 64: ...54 Blocking of signals during test KDSWHU RPPRQ IXQFWLRQV ...
Page 88: ...78 Scheme communication logic ZCOM KDSWHU LQH LPSHGDQFH ...
Page 146: ...136 Unbalance protection for capacitor banks TOCC KDSWHU XUUHQW ...
Page 166: ...156 Dead line detection DLD KDSWHU 3RZHU V VWHP VXSHUYLVLRQ ...
Page 378: ...368 Monitoring of DC analog measurements KDSWHU 0RQLWRULQJ ...
Page 384: ...374 Pulse counter logic PC KDSWHU 0HWHULQJ ...
Page 412: ...402 Serial communication modules SCM KDSWHU DWD FRPPXQLFDWLRQ ...
Page 440: ...430 LED indication module KDSWHU DUGZDUH PRGXOHV ...