Siemens SIPROTEC 7SD610 User Manual

Functions
2.16 Function Control and Circuit Breaker Test
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
232
Single-pole tripping for two-phase faults
Single-pole tripping for two-phase faults is a special feature. If a phase-to-phase fault without earth occurs in
an earthed system, this fault can be cleared by single-pole trip and automatic reclosure in one of the faulted
phases as the short-circuit path is interrupted in this manner. The phase selected for tripping must be the same
at both line ends (and should be the same for the entire system).
The setting parameter Trip2phFlt (address 1156) allows to select whether this tripping is to be 1pole
leading Ø, i.e. single-pole tripping in the leading phase or 1pole lagging Ø, i.e. single-pole tripping in the
lagging phase. Standard setting is 3pole tripping in the event of two-phase faults (default setting).
Table 2-9 Single-pole and three-pole trip depending on fault type
General Trip
All trip signals for the functions are connected by OR and generate the message „Relay TRIP“. This can
be allocated to LED or output relay.
Terminating the Trip Signal
Once a trip command is initiated, it is phase segregatedly latched (in the event of three-pole tripping for each
of the three poles) (refer to Figure 2-105). At the same time, the minimum trip command duration TMin TRIP
CMD (address 240) is started. This ensures that the trip command is output to the circuit breaker for a sufficiently
long time even if the tripping protection function resets very rapidly. The trip commands can only be reset after
all tripping protection functions have dropped out and
after the minimum trip command duration has elapsed.
A further condition for the reset of the trip command is that the circuit breaker has opened, in the event of single-
pole tripping the relevant circuit breaker pole. In the function control of the device, this is checked by means of
the circuit breaker position feedback (Section „Detection of the Circuit Breaker Position“) and the flow of cur-
rent. In address 1130 PoleOpenCurrent, the residual current threshold which may definitely not be exceed-
Type of Fault
(from Protection Function)
Parameter
Trip2phFlt
Output signals for trip
TRIP 1p.L1 TRIP 1p.L2 TRIP 1p.L3 Relay TRIP 3ph.
L1 (any) X
L2 (any) X
L3 (any) X
L1 E (any) X
L2 E (any) X
L3 E (any) X
L1 L2 3pole X
L1 L2 1pole leading Ø X
L1 L2 1pole lagging Ø X
L2 L3 3pole X
L2 L3 1pole leading Ø X
L2 L3 1pole lagging Ø X
L1 L3 3pole X
L1 L3 1pole leading Ø X
L1 L3 1pole lagging Ø X
L1 L2 E (any) X
L2 L3 E (any) X
L1 L3 E (any) X
L1 L2 L3 (any) X
L1 L2 L3 E (any) X
E(any) X

Siemens SIPROTEC 7SD610 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SD610
Category	Relays
Language	English