Siemens SIPROTEC 7SK80 User Manual

Functions
2.1 General
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
45
Voltage Protection (Protection Operating Quantities)
In a three-phase connection, the fundamental harmonic of the largest 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 pro-
tection relies either on the positive sequence voltage (V1) or the smallest of 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. QUANTITY 27.
2.1.3.3 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under "Display Additional Settings".
The table indicates region-specific default settings. Column C (configuration) indicates the corresponding sec-
ondary nominal current of the current transformer.
Addr. Parameter C Setting Options Default Setting Comments
201 CT Starpoint towards Line
towards Busbar
towards Line CT Starpoint
202 Vnom PRIMARY 0.10 .. 800.00 kV 20.00 kV Rated Primary Voltage
203 Vnom SECONDARY 34 .. 225 V 100 V Rated Secondary Voltage
(L-L)
204 CT PRIMARY 10 .. 50000 A 400 A CT Rated Primary Current
205 CT SECONDARY 1A
5A
1A CT Rated Secondary
Current
206A Vph / Vdelta 1.00 .. 3.00 1.73 Matching ratio Phase-VT To
Open-Delta-VT
209 PHASE SEQ. A B C
A C B
A B C Phase Sequence
210A TMin TRIP CMD 0.01 .. 32.00 sec 0.15 sec Minimum TRIP Command
Duration
212 BkrClosed I MIN 1A 0.04 .. 1.00 A 0.04 A Closed Breaker Min.
Current Threshold
5A 0.20 .. 5.00 A 0.20 A
213 VT Connect. 3ph Van, Vbn, Vcn
Vab, Vbc, VGnd
Vab, Vbc
Vab, Vbc, Vx
Van, Vbn, Vcn VT Connection, three-
phase
214 Rated Frequency 50 Hz
60 Hz
50 Hz Rated Frequency
217 Ignd-CT PRIM 1 .. 50000 A 60 A Ignd-CT rated primary
current
218 Ignd-CT SEC 1A
5A
1A Ignd-CT rated secondary
current
220 Threshold BI 1 Thresh. BI 176V
Thresh. BI 88V
Thresh. BI 19V
Thresh. BI 176V Threshold for Binary Input 1
221 Threshold BI 2 Thresh. BI 176V
Thresh. BI 88V
Thresh. BI 19V
Thresh. BI 176V Threshold for Binary Input 2

Siemens SIPROTEC 7SK80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SK80
Category	Protection Device
Language	English