Siemens siprotec 7SA522 User Manual

2 Functions
102
7SA522 Manual
C53000-G1176-C155-3
2.2.4 Tripping Logic of the Distance Protection
2.2.4.1 Functional Description
General Device
Pickup
As soon as any one of the distance zones has determined with certainty that the fault
is inside its tripping range, the signal ´'LV3,&.83µ (general fault detection of the
distance protection) is generated. This signal is alarmed and made available for the
initialization of internal and external supplementary functions. (e.g. teleprotection
signal transmission, automatic reclosure).
Zone Logic of the
Independent Zones
Z1 up to Z5
As was mentioned in the description of the measuring technique, each distance zone
generates an output signal which is associated with the zone and the affected phase.
The zone logic combines these zone fault detections with possible further internal and
external signals. The delay times of the distance zones can be started either together
by a general pickup of the distance protection function or individually upon entry into
the corresponding distance zone. Parameter 6WDUW7LPHUV (address ) is set
to RQ'LV3LFNXS by default. This setting ensures that all delay times continue
even when changing the fault type or the measuring loop selection, for example when
an intermediate infeed is switched off. This setting is also preferable if other distance
protection relays in the network employ this time start scheme. If particular importance
is attached to the time grading, for example when the fault location changes from zone
Z3 to zone Z2, the setting RQ=RQH3LFNXS should be selected. The simplified zone
logic is shown in Figure 2-30 using for zone 1, Figure 2-31 for zone 2 and Figure 2-32
for the third zone. Zones Z4 and Z5 function according to Figure 2-33.
1432 ZR(Z4) 1A 0.050 .. 200.000 Ω 10.000 Ω ZR(Z4), Impedance Reach
5A 0.010 .. 40.000 Ω 2.000 Ω
1441 Op. mode Z5 Forward
Reverse
Inactive
Inactive Operating mode Z5
1442 ZR(Z5) 1A 0.050 .. 200.000 Ω 10.000 Ω ZR(Z5), Impedance Reach
5A 0.010 .. 40.000 Ω 2.000 Ω
1451 Op. mode Z1B Forward
Reverse
Inactive
Forward Operating mode Z1B (ex-
tended zone)
1452 ZR(Z1B) 1A 0.050 .. 200.000 Ω 3.000 Ω ZR(Z1B), Impedance
Reach
5A 0.010 .. 40.000 Ω 0.600 Ω
1471A Mem.Polariz.PhE 0.0 .. 100.0 % 15.0 % Voltagememory polariza-
tion (phase-e)
1472A CrossPolarizPhE 0.0 .. 100.0 % 15.0 % Cross polarization (phase-
e)
1473A Mem.Polariz.P-P 0.0 .. 100.0 % 15.0 % Voltagememory polariza-
tion (phase-phase)
1474A CrossPolarizP-P 0.0 .. 100.0 % 15.0 % Cross polarization (phase-
phase)
Addr. Parameter C Setting Options Default Setting Comments

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English