Functions
6-117SA6 Manual
C53000-G1176-C133-1
Phase Rotation Address 3+$6(6(4 is used to establish the phase rotation. The preset phase
sequence is “
///”. For systems that use a phase sequence of “///”,
address must be set accordingly.
Units of Length Address 'LVWDQFH8QLW corresponds to the units of length (miles or km)
applicable to fault locating. Changing the length unit will not result in an automatic
conversion. 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
accurate measurement of the fault distance (distance protection, fault location) during
earth faults. In address )RUPDW== the format for entering the residual
compensation is determined. It is possible to either use the ratio 5(5/ and ;(;/ or
to enter the complex earth (residual) impedance factor .. The actual setting of the
earth (residual) 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 7&%FORVH (address ) 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 $ the minimum trip command duration 70LQ75,3&0' 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 changed with DIGSI
®
4 under
“Additional Settings”.
Under address $ the maximum close command duration 70D[&/26(&0' 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 changed 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
7&%WHVWGHDG 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.
Addr. Setting Title Function Setting Options Default Setting
201 CT Starpoint Power System Data 1 towards Line
towards Busbar
towards Line
203 Unom PRIMARY Power System Data 1 1.0..1200.0 kV 400.0 kV
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