Settings - Siemens SIPROTEC 7SA522 Manual

2 Functions
Mode of Earth Im-
pedance (Residual)
Compensation
Operating Time of
the Circuit Breaker
Trip Signal Dura-
tion
Circuit Breaker Test
2.1.3.2

Settings

Addr. Parameter
201 CT Starpoint
203 Unom PRIMARY
204 Unom SECONDARY
205 CT PRIMARY
206 CT SECONDARY
44
setting values which depend on this distance unit. They have to be re-entered into their
corresponding valid addresses.
Matching of the earth to line impedance is an essential prerequisite for the accurate
measurement of the fault distance (distance protection, fault locator) during earth
faults. In address  )RUPDW == the format for entering the residual compen-
sation is determined. It is possible to either use the ratio 5(5/ ;(;/ or to enter
the complex earth (residual) impedance factor .. The actual setting of the earth (re-
sidual) impedance factors is done in the power system data 2 (refer to Section 2.1.5).
The circuit breaker closing time 7&% FORVH at address  is required if the device
is to close also under asynchronous system conditions, no matter whether for manual
closing, for automatic reclosing after three-pole tripping, or both. The device will then
calculate the time for the close command such that the voltages are phase-synchro-
nous the instant the breaker poles make contact.
In address  the minimum trip command time 70LQ 75,3 &0' is set. This setting
applies to all protective functions that initiate tripping. It also determines the length of
the trip pulse when a circuit breaker trip test is initiated via the device. This setting is
only possible via DIGSI
In 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 ter-
minated following a new trip command from a protection function. This setting is only
®
possible via DIGSI at "Additional Settings".
7SA522 allows a circuit breaker test during operation by means of a tripping and a
closing command entered on the front panel or via DIGSI
command is set as explained above. Address  7&%WHVWGHDG determines the
duration from the end of the trip command until the start of the close command for this
test. It should not be less than 0.1s.
Addresses which have an appended "A" can only be changed with DIGSI, under Ad-
ditional Settings.
Setting Options
towards Line
towards Busbar
1.0 .. 1200.0 kV
80 .. 125 V
10 .. 5000 A
1A
5A
®
at "Additional Settings".
Default Setting
towards Line
400.0 kV
100 V
1000 A
1A
®
. The duration of the trip
Comments
CT Starpoint
Rated Primary Voltage
Rated Secondary Voltage (L-L)
CT Rated Primary Current
CT Rated Secondary Current
7SA522 Manual
C53000-G1176-C155-3