Table of Contents
Advertisement
Functions
2.1 General
The Appendix provides some connection examples for all connection types
Nominal Values of Voltage Transformers (VTs)
At addresses 202 Vnom PRIMARY and 203 Vnom SECONDARY, information is entered regarding the primary
nominal voltage and secondary nominal voltage (phase-to-phase) of the connected voltage transformers.
Transformation Ratio of Voltage Transformers (VTs)
Address 206 Vph / Vdelta informs the device of the adjustment factor between the phase voltage and the
displacement voltage. This information is relevant for the processing of ground faults (in grounded systems
and ungrounded systems), for the operational measured value V
If the voltage transformer set provides open delta windings and if these windings are connected to the device,
this must be specified accordingly in address 213 (see above margin heading "Voltage Connection"). Since the
voltage transformer ratio is normally as follows:
[uebersetzung-spannungswandler-020313-kn, 1, en_US]
the factor V
/V
ph
must be used if the VN voltage is connected. For other transformation ratios, i.e. the formation of the
displacement voltage via an interconnected transformer set, the factor must be corrected accordingly.
Please take into consideration that also the calculated secondary V
address 206. Thus, even if the V
operational measured value V
If Vab, Vbc, VGnd is selected as voltage connection type, parameter Vph / Vdelta is used to calculate
the phase-to-ground voltages and is therefore important for the protection function. With voltage connection
type Van, Vbn, Vcn, this parameter is used only to calculate the operational measured value of the secon-
dary voltage V
.
N
Trip and Close Command Duration (Breaker)
In address 210 the minimum trip command duration TMin TRIP CMD is set. This setting applies to all protec-
tion functions that can initiate tripping.
In address 211 the maximum close command duration TMax CLOSE CMD is set. It applies to the integrated
reclosing function. It must be set long enough to ensure that the circuit breaker has securely closed. An exces-
sive duration causes no problem since the closing command is interrupted in the event another trip is initiated
by a protection function.
Pickup Thresholds of the Binary Inputs (Thresholds BI)
At address 220 Threshold BI 1 to 226 Threshold BI 7 you can set the pickup thresholds of the binary
inputs of the device. The settings Thresh. BI 176V, Thresh. BI 88V or Thresh. BI 19V are possible.
Voltage Protection (Protection Operating Quantities)
In a three-phase connection, the fundamental harmonic of the three phase-to-phase voltages (Vphph) or
phase-ground voltages (Vph-n) or the positive sequence voltage (V1) or the negative sequence voltage (V2)
is supplied to the overvoltage protection elements.
In three-phase connection, undervoltage protection relies either on the positive sequence voltage (V1) or the
phase-to-phase voltages (Vphph) or the phase-to-ground voltages (Vph-n).
This is configured by setting the parameter value in address 614 OP. QUANTITY 59 and 615 OP. QUAN-
TITY 27.
Via Parameter 5009 59 Phases and 5109 27 Phases you may configure which measured quantity is to be
evaluated (All phases or Largest phase or Smallest phase).
30
(secondary voltage, address 206 Vph / Vdelta) must be set to 3/ √3 = √3 = 1.73 which
N
-voltage is not connected, address 206 has an impact on the secondary
0
.
N
atC Connection
Examples.
and measured-variable monitoring.
N
-voltage is divided by the value set in
0
SIPROTEC 4, 7RW80, Manual
C53000-G1140-C233-4, Edition 07.2018
Advertisement
Table of Contents
