Siemens SIPROTEC 4 7SD80 Manual Download

Page: 42 / 416

General Protection Data (Power System Data 2)

The general protection data (

P.System Data 2

) include settings associated with all functions rather than a

specific protection, monitoring or control function. In contrast to the

P.System Data 1

as discussed before,

they can be changed over with the setting groups and set on the operator panel of the device.

Setting Notes

Rated Values of Protected Lines

With address 1103

FullScaleVolt.

you inform the device of the primary nominal voltage (phase-to-phase)

of the equipment to be protected (if voltages are applied). This setting influences the displays of the opera-
tional measured values in %.
The primary nominal current (address 1104

FullScaleCurr.

) is that of the protected object. For cables the

thermal continuous current-loading capacity can be selected. For overhead lines the rated current is usually
not defined. set the rated current of the current transformers (as set in address 205

CT PRIMARY

, Section

2.1.3.1 Setting Notes

). If the current transformers have different nominal currents at the ends of the protected

object, set the highest nominal current value for all ends.
This setting will not only have an impact on the indication of the operational measured values in per cent, but
must also be exactly the same for each end of the protected object, since it is the basis for the current
comparison at the ends.

General Line Data

The directional values (power, power factor, work and based on work: minimum, maximum, average and
threshold values), calculated in the operational measured values, are usually defined positive in direction to
the protected object. This requires that the connection polarity for the entire device is configured accordingly
in the

P.System Data 1

(compare also “Polarity of the Current Transformers”, address 201). But it is also

possible to define the „forward“ direction for the protection functions and the positive direction for the power
etc. differently, e.g. so that the active power flow (from the line to the busbar) is indicated in the positive
sense. To do so, set address 1107

P,Q sign

reversed

. If the setting is

not reversed

(default), the

positive direction for the power etc. corresponds to the “forward” direction for the protection functions.

Circuit-Breaker Status

Information regarding the circuit-breaker position is required by various protection and supplementary func-
tions to ensure their optimal functionality. The device has a circuit-breaker status recognition which processes
the status of the circuit-breaker auxiliary contacts and contains also a detection based on the measured
currents and voltages (see also Section

2.16.2 Tripping Logic for the Entire Device

In address 1130 the residual current

PoleOpenCurrent

is set, which will definitely not be exceeded when

the circuit-breaker pole is open. If parasitic currents (e.g. through induction) can be excluded when the circuit
breaker is open, this setting may be very sensitive. Otherwise this setting must be increased. Usually the
presetting is sufficient. This parameter can only be set in DIGSI at Display Additional Settings.
The seal-in time

SI Time all Cl.

(address 1132) determines the period of time during which the active

protection functions are enabled following each energization of the line. This time is started when the internal
switching detection function recognizes closing of the circuit breaker or if the circuit-breaker auxiliary contacts
or a binary device input signal that the circuit breaker was closed. The time must therefore be longer than the
command time of these protection functions plus a safety margin. This parameter can only be set in DIGSI at
Display Additional Settings.
In address 1134

Line Closure

the criteria for the internal recognition of line energization are determined.

only with ManCl

means that only the manual close signal via binary input or the integrated control is eval-

uated as closure.

I OR V or ManCl

means that additionally the measured currents or voltages are used to

determine closure of the circuit breaker, whereas

52a OR I or M/C

implies that either the currents or the

states of the circuit-breaker auxiliary contacts are used to determine closure of the circuit breaker. If the
voltage transformers are not arranged on the line side, the setting

52a OR I or M/C

must be used. In the

case of

I or Man.Close

only the currents or the manual close signals are used to recognize closing of the

circuit breaker.

2.1.6

2.1.6.1

Functions
2.1 General

SIPROTEC 4, 7SD80, Manual

E50417-G1100-C474-A2, Edition 02.2018