SIEMENS
SINAMICS G180
Configuring instructions
ZLU - Supplementary Supply Agreements for
Converter Drives in Power Plants
5/20
Siemens D 18.1 · 2014
5
■
Overview
The VDEW publication ZLU (Zusätzliche Liefervereinbarungen
für Umrichterantriebe in Kraftwerken (Supplementary Supply
Agreements for Converter Drives in Power Plants), 1st Edition
1997) describes the design of frequency converters for power
plant applications. It is noted in the preface of this document that
the ZLU does not constitute a standard in the sense of a VDE
regulation, but describes requirements and/or technical data
and equipment details which apply additionally to converter
drives used for power plant applications.
Several chapters are dedicated to describing the extensive
range of equipment documentation. The KKS (Kraftwerkskenn-
zeichnungssystem), a standardized identification system for
power plants, must generally be applied throughout the docu-
mentation. As a minimum requirement, the correct KKS No. for
the drive must always be stated in the documentation. The
documentation must describe the converter interfaces in such a
way that the destination and the type and number of used cables
are clear even if these are not included in the scope of supply of
the converter.
Furthermore, supplementary rules regarding documentation
apply in every power plant and these must also be taken into
account. These rules must generally be stated as special
requirements, e.g. under "Engineer To Order – ETO" (X80),
see Option descriptions on Page 4/34.
Noise emission values which might require a special design are
specified in Section 1.10. Where applicable, these must be
stated or selected as special requirements in options.
The ZLU also describes the converter transformer and the motor.
This information must be taken into account in the design of
these components.
The electrical design specifications (Chapter 4) state that the
operating device must also include a key-operated switch for
local control of the converter. It is further stated that the incoming
supply must be connected via a fuse switch disconnector and
main contactor or via a circuit breaker. Generally speaking,
requirements often deviate from this specification. The key-
operated switch and the line-side power switchgear must be
selected in a further option. Unless the order contains any
additional information, option
S12
must be selected. This
includes the local key-operated switch and the circuit breaker.
Option
S02
is often selected as well.
Chapter 1.5 "Rated output" states that the drive may continu-
ously output at least 105 %, but maximum 120 %, of the shaft
power required in maximum-load operation of the driven ma-
chine. This means that the converters must always be designed
with a 5 % power reserve. This must be taken into account in the
drive design. Option X51 "Extended overvoltage range" does not
include any power reserves, see "Engineer To Order – ETO"
under Option descriptions on Page 4/34.
The device testing procedures are described in Chapter 6
"Quality assurance, Testing, Acceptance". It includes a descrip-
tion of routine and type tests and prescribes type tests as man-
datory for first deliveries. It is not acceptable to test a selected
component from a series. The operator or the ordering party or
his/her representative must be given the opportunity to carry out
test inspections during the manufacturing process.
Furthermore, the total efficiency (transformer, converter, motor)
must be verified by computation or in a test bay or at the site of
installation.
Many tests are also specified as optional subject to agreement.
These must be selected in the form of additional options. The
test requirements specified in the ZLU are fulfilled with one of the
options
F82
,
F83
,
F84
,
F85
(warm-up with original motor).
Chapter 1.9 "Operational requirements" specifies special power
system data in the event of load shedding of the turbine gener-
ator and offloading to auxiliary supply. The converters must re-
main in operation in the event of a brief frequency increase to
1.1
f
r
for 5 s with simultaneous voltage increase to 1.25 ×
V
r
for
2 s. Depending on operational requirements, it might be neces-
sary to agree voltage values of up to 1.4 ×
V
r
. It is not possible to
implement this brief overvoltage load capacity on every con-
verter (see option description X51 Extended voltage range).
© Siemens AG 2014