ABB RED650, Руководство по применению

Страница: 149 / 454

The setting of the tEF timer must cover, with sufficient margin, the opening time of
a circuit breaker and the dead-time of a single-phase autoreclosing together with
the breaker closing time.
7.3 Automatic switch onto fault logic ZCVPSOF
SEMOD153633-1 v3
7.3.1 Identification
SEMOD155890-2 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Automatic switch onto fault logic ZCVPSOF - -
7.3.2 Application
M13830-3 v6
Automatic switch onto fault logic, voltage- and current-based function ZCVPSOF
is a complementary function to impedance measuring functions, but may use the
information from such functions.
With ZCVPSOF, a fast trip is achieved for a fault on the whole line when the line is
being energized. The ZCVPSOF tripping is generally non-directional to secure a
trip at fault situations where directional information cannot be established, for
example, due to lack of polarizing voltage when a line potential transformer is
used.
Automatic activation based on dead-line detection can only be used when the
voltage transformer is situated on the line side of a circuit breaker.
When line side voltage transformers are used, the use of the nondirectional distance
zones secures switch onto fault tripping for close-in three-phase short circuits. The
use of the nondirectional distance zones also gives a fast fault clearance when
energizing a bus from the line with a short circuit fault on the bus.
Other protection functions like time-delayed phase and zero-sequence overcurrent
function can be connected to ZCVPSOF to increase the dependability in the
scheme.
When the voltage transformers are situated on the bus side, the automatic switch
onto fault detection based on dead-line detection is not possible. In such cases the
deadline detection is bypassed using the breaker closing status and the switch onto
fault logic is activated.
1MRK 505 393-UEN B
Section 7
Impedance protection
Line differential protection RED650 2.2 IEC 143
Application manual