Siemens SIPROTEC 4 7VK61 Manual Download

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General line data

The directional values (power, power factor, work and related min., max., mean and setpoint values), calcu-
lated in the operational measured values, are usually defined with positive direction towards the protected
object. This requires that the connection polarity for the entire device was configured accordingly in the Power
System Data 1 (compare also “Polarity of Current Transformers”, address 201). But it is also possible to reverse
the direction for the outputs without having to change the transformer connections e.g. so that the active
power flow from the line to the busbar is indicated in the positive sense. Set under the address 1107

P,Q

sign

the option

reversed

. If the setting is

not reversed

(default), the positive direction for energy flow

from busbar to line are evaluated as being positive.

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 for opening and closing (see also Section

2.8.1 Function Control

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 altered in DIGSI at Display Additional Settings.
The residual voltage

PoleOpenVoltage

, which will definitely not be exceeded when the circuit breaker pole

is open, is set in address 1131. Voltage transformers must be on the line side. The setting should not be too
sensitive because of possible parasitic voltages (e.g. due to capacitive coupling). It must in any event be set
below the smallest phase-earth voltage which may be expected during normal operation. Usually the preset-
ting is sufficient. This parameter can only be altered in DIGSI at Display Additional Settings.
Address 1135

Reset Trip CMD

determines under which conditions a trip command is reset. If

CurrentO-

penPole

is set, the trip command is reset as soon as the current disappears. It is important that the value set

in address 1130

PoleOpenCurrent

(see above) is undershot. If

Current AND CB

is set, the circuit breaker

auxiliary contact must send a message that the circuit breaker is open. It is a prerequisite for this setting that
the position of the auxiliary contacts is allocated via a binary input.
For special applications, in which the device trip command does not always lead to a complete cutoff of the
current, the setting

Pickup Reset

can be chosen. In this case, the trip command is reset as soon as the

pickup of the tripping protection function drops off and - just as with the other setting options- the minimum
trip command duration (address 240) has elapsed. The setting

Pickup Reset

makes sense, for instance,

during the test of the protection equipment, when the system-side load current cannot be cut off and the test
current is injected in parallel to the load current.

NOTE

For CB Test and automatic reclosure the CB auxiliary contact status derived with the binary inputs >CB1 ...
(No. 366 to 371, 410 and 411) is relevant to indicate the CB switching status. The other binary inputs
>CB ... (No. 351 to 353, 379 and 380) are used for detecting the status of the line (address 1134) and for
reset of the trip command (address 1135). Address 1135 is also used by other protection functions, e.g. by
the echo function, energization in case of overcurrent etc. For use with one circuit breaker only, both
binary input functions, e.g. 366 and 351, can be allocated to the same physical input. For applications with
2 circuit breakers per feeder (1.5 circuit breaker systems or ring bus), the binary inputs >CB1... must be
connected to the correct circuit breaker. The binary inputs >CB... then need the correct signals for detecting
the line status. In certain cases, an additional CFC logic may be necessary.

Address 1136

OpenPoleDetect.

defines the criteria for operating the internal open-pole detector (see also

Section

2.8.1 Function Control

, Subsection Open-Pole Detector). When using the default setting

w/ meas-

urement

, all available data are evaluated that indicate single-pole dead time. The internal trip command and

pickup indications, the current and voltage measured values and the CB auxiliary contacts are used. To eval-
uate only the auxiliary contacts including the phase currents, set the address 1136 to

Current AND CB

. If

you do not wish to detect single-pole dead time, set

OpenPoleDetect.

OFF

For manual closure of the circuit breaker via binary inputs, it can be specified in address 1151

MAN. CLOSE

whether the integrated manual CLOSE detection checks the synchronism between the busbar voltage and the

Functions
2.1 General

SIPROTEC 4, 7VK61, Manual

C53000-G1176-C159-5, Edition 05.2018