Siemens Siprotec 7UM611, Руководство пользователя

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3 Mounting and Commissioning
234
7UM61 Manual
C53000-G1176-C127-3
3.1 Mounting and Connections
General
WARNING!
Warning of improper transport, storage, installation or erection of the device.
Failure to observe these precautions can result in death, personal injury or substantial
property damage.
Unproblematic and safe use of this device depends on proper transport, storage, in-
stallation and erection of the device taking into account the warnings and instructions
of the device manual.
In particular the general installation and safety regulations for working in power current
installations (for example, ANSI, IEC, EN, DIN, or other national and international reg-
ulations) must be observed.
3.1.1 Configuration Information
Prerequisites For mounting and connection the following requirements and conditions must be met:
The rated device data has been tested as recommended in the SIPROTEC 4 System
Description /1/ and their compliance with these data is verified with the Power System
Data.
Connection Vari-
ants Overview diagrams are shown in Appendix A.2. Connection examples for current and
voltage transformer circuits are given in Appendix A.3. It must be checked that the
setting configuration of the
Power System Data 1
, Section 2.3, corresponds with
the connections.
Currents / Voltages Connection diagrams are shown in the Appendix. Current and voltage transformer
connection possibilities for busbar connection (address
272 SCHEME
=
Busbar
) and
for unit connection (address
272
=
Unit transf.
) are given in the appendix A.3. In
all examples the CT starpoints point towards the protection object so that address
210
CT Starpoint
must be set to
towards machine
.
In the connection examples the U
E
input of the device is always connected to the open
delta winding of a voltage transformer set. Accordingly address
223 UE CONNECTION
must be set to
broken delta
.
A standard connection where one busbar is fed by several generators can be found in
the Appendix, A.3. The earth fault current can be increased by an earthing transformer
connected to the busbar (approx. 10 A max.), allowing a protection range of up to 90
% to be achieved. The earth current is measured using the toroidal current transformer
to achieve the necessary sensitivity. During startup of the machine, the displacement
voltage can be used as a criterion for detecting an earth fault until synchronization is
completed.
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