Specifications

Generator and Motor Protection SIPROTEC 7SK80
6/11SIPROTEC Compact · SIEMENS SIP 3.01 · Edition 3
Metered values
For internal metering, the unit can calculate an energy
metered value from the measured current and voltage
values. If an external meter with a metering pulse output is
available, the 7SK80 can obtain and process metering pulses
through an indication input. The metered values can be
displayed and passed on to a control center as an accumu-
lated value with reset. A distinction is made between
forward, reverse, active and reactive energy.
Expansion of the binary inputs and outputs with
SICAM I / O Unit 7XV5673
To expand binary inputs and outputs, up to two SICAM I / O
Units 7XV5673 can be connected to the SIPROTEC 7SK80.
Every SICAM I / O Unit 7XV7653 has 6 binary inputs, 6
binary outputs and one ethernet switch for cascading. The
connection to the protection device is established either via
the DIGSI Ethernet service interface Port A or via IEC 61850
GOOSE to Port B (system interface with EN100 module).
Circuit-breaker wear monitoring /
circuit-breaker remaining service life
Methods for determining circuit-breaker contact wear or
the remaining service life of a circuit-breaker (CB) allow CB
maintenance intervals to be aligned to their actual degree of
wear. The benefi t lies in reduced maintenance costs.
There is no exact mathematical method to calculate the
wear or the remaining service life of a circuit-breaker that
takes arc-chamber’s physical conditions into account when
the CB opens.
This is why various methods of determining CB wear have
evolved which refl ect the different operator philosophies.
To do justice to these, the relay offers several methods:
• ΣI
• ΣI
x
, with x = 1..3
• Σi
2
t.
The devices also offer a new method for determining the
remaining service life:
• Two-point method
The CB manufacturers double-logarithmic switching cycle
diagram (see Fig. 6/8) and the breaking current at the time
of contact opening serve as the basis for this method. After
CB opening, the two-point method calculates the remaining
number of possible switching cycles. Two points P1 and P2
only have to be set on the device. These are specifi ed in the
CB’s technical data.
All of these methods are phase-selective and a limit value
can be set in order to obtain an alarm if the actual value falls
below or exceeds the limit value during determination of
the remaining service life.
Application sheets
Commissioning
Commissioning could not be easier and is supported by
DIGSI 4. The status of the binary inputs can be read individu-
ally and the state of the binary outputs can be set individu-
ally. The operation of switching elements (circuit-breakers,
disconnect devices) can be checked using the switching
functions of the relay. The analog measured values are
represented as wide-ranging operational measured values.
To prevent transmission of information to the control center
during maintenance, the communications can be disabled
to prevent unnecessary data from being transmitted.
During commissioning, all indications with test tag for test
purposes can be connected to a control and protection
system.
Test operation
During commissioning, all indications with test tag can be
passed to a control system for test purposes.
Fig. 6/8 Permissible number of operating cycles as a function of
breaking current
P1: Permissible number
of operating cycles
at rated normal
current
P2: Permissible number
of operating cycles
at rated short-
circuit current
1
2
3
4
5
6
7
8
9
10