Functions
6-11
7SA6 Manual
C53000-G1176-C156-2
Phase Rotation
Address
235 PHASE SEQ.
is used to establish the phase rotation. The preset phase
sequence is “
L1 L3 L2
”. For systems that use a phase sequence of “
L1 L3 L2
”, ad-
dress
235
must be set accordingly.
Units of Length
Address
236
Distance Unit
corresponds to the units of length (miles or km) ap-
plicable to fault locating. Changing the length unit will not result in an automatic con-
version. The new setting values must be entered at the appropriate addresses.
Mode of Earth
Impedance
(Residual)
Compensation
Matching of the earth to line impedance ratio is an essential prerequisite for the accu-
rate measurement of the fault distance (distance protection, fault location) during earth
faults. In address
237
Format Z0/Z1
the format for entering the residual compen-
sation is determined. It is possible to either use the ratio
RE/RL
and
XE/XL
or to enter
the complex earth (residual) impedance factor
K0
. The actual setting of the earth (re-
sidual) impedance factors is done in conjunction with the general protection data (refer
to Section 6.1.3).
Closing Time of the
Circuit Breaker
The closing time of the circuit breaker
T-CB close
(address
239
) is necessary if the
synchro-check function of the relay is used also for asynchronous switching. In this
case, the relay calculates the ideal closing instant such that the two voltages (bus bar
and feeder) are in synchronism at the instant when the breaker primary contacts close.
Trip/Close
Command Duration
Under address
240A
the minimum trip command duration
TMin TRIP CMD
is set.
This applies to all protection and control functions which may issue a trip command.
This also determines the length of the trip command pulse when a circuit breaker trip
test is initiated via the device. This setting can only be modified with DIGSI
®
4 under
“Additional Settings”.
Under address
241A
the maximum close command duration
TMax CLOSE CMD
is set.
This applies to all close commands issued by the device. It also determines the length
of the close command pulse when a circuit breaker test cycle is issued via the device.
It must be set long enough to ensure that the circuit breaker has securely closed.
There is no risk in setting this time too long, as the close command will in any event
be terminated following a new trip command from a protection function. This setting
can only be modified with DIGSI
®
4 under “Additional Settings”.
Circuit Breaker
Test
With the 7SA6 it is possible to initiate from the front of the device or with DIGSI
®
4 an
on load circuit breaker test consisting of a trip and close command. The duration of the
commands is determined by the command duration settings above. With address
242
T-CBtest-dead
the duration from the end of the trip command up to the start of the
close command for this test is determined. This setting should not be shorter than
0.1 s.
6.1.1.1
Settings
Note: The indicated secondary current values for setting ranges and default settings
refer to I
N
= 1 A. For the nominal current 5 A these values are to be multiplied by 5.
Addresses with an attached „A“ can only be changed with DIGSI
®
4 in “Additional
Settings“.
Addr.
Setting Title
Setting Options
Default Setting
Comments
201
CT Starpoint
towards Line
towards Busbar
towards Line
CT Starpoint
Содержание siprotec 7SA6
Страница 2: ...Siemens Aktiengesellschaft Book No C53000 G1176 C156 2 ...
Страница 18: ...xviii 7SA6 Manual C53000 G1176 C156 2 ...
Страница 32: ...Introduction 1 14 7SA6 Manual C53000 G1176 C156 2 ...
Страница 82: ...Hardware and Connections 2 50 7SA6 Manual C53000 G1176 C156 2 ...
Страница 119: ...SIPROTEC 4 Devices 4 25 7SA6 Manual C53000 G1176 C156 2 Figure 4 20 CFC Logic example ...
Страница 190: ...Configuration 5 62 7SA6 Manual C53000 G1176 C156 2 ...
Страница 559: ...Control During Operation 7 45 7SA6 Manual C53000 G1176 C156 2 Figure 7 45 Circuit breaker trip test in DIGSI 4 ...
Страница 652: ...Installation and Commissioning 8 78 7SA6 Manual C53000 G1176 C156 2 ...
Страница 724: ...Technical Data 10 56 7SA6 Manual C53000 G1176 C156 ...
Страница 800: ...Appendix A 76 7SA6 Manual C53000 G1176 C156 2 ...
Страница 866: ...Appendix B 66 7SA6 Manual C53000 G1176 C156 2 ...