Siemens siprotec 7SD5 User Manual

2 Functions
346
7SD5 Manual
C53000-G1176-C169-1
Further application examples exist in the field of power stations. The frequency values
to be set mainly depend, also in these cases, on the specifications of the power sys-
tem/power station operator. In this context, the underfrequency protection also
ensures the power station’s own demand by disconnecting it from the power system
on time. The turbo regulator regulates the machine set to the nominal speed. Conse-
quently, the station's own demands can be continuously supplied at nominal frequen-
cy.
Since the dropout threshold is 20 mHz below or above the trip frequency, the resulting
„minimum“ trip frequency is 30 mHz above or below the nominal frequency.
A frequency increase can, for example, occur due to a load shedding or malfunction
of the speed regulation (e.g. in a stand-alone system). In this way, the frequency pro-
tection can, for example, be used as overspeed protection.
2.18.3 Settings
Addr. Parameter Setting Options Default Setting Comments
3601 O/U FREQ. f1 ON: Alarm only
ON: with Trip
OFF
ON: Alarm only Over/Under Frequency Protection
stage f1
3602 f1 PICKUP 45.50 .. 54.50 Hz 49.50 Hz f1 Pickup
3603 f1 PICKUP 55.50 .. 64.50 Hz 59.50 Hz f1 Pickup
3604 T f1 0.00 .. 600.00 sec 60.00 sec T f1 Time Delay
3611 O/U FREQ. f2 ON: Alarm only
ON: with Trip
OFF
ON: Alarm only Over/Under Frequency Protection
stage f2
3612 f2 PICKUP 45.50 .. 54.50 Hz 49.00 Hz f2 Pickup
3613 f2 PICKUP 55.50 .. 64.50 Hz 57.00 Hz f2 Pickup
3614 T f2 0.00 .. 600.00 sec 30.00 sec T f2 Time Delay
3621 O/U FREQ. f3 ON: Alarm only
ON: with Trip
OFF
ON: Alarm only Over/Under Frequency Protection
stage f3
3622 f3 PICKUP 45.50 .. 54.50 Hz 47.50 Hz f3 Pickup
3623 f3 PICKUP 55.50 .. 64.50 Hz 59.50 Hz f3 Pickup
3624 T f3 0.00 .. 600.00 sec 3.00 sec T f3 Time Delay
3631 O/U FREQ. f4 ON: Alarm only
ON: with Trip
OFF
ON: Alarm only Over/Under Frequency Protection
stage f4
3632 f4 PICKUP 45.50 .. 54.50 Hz 51.00 Hz f4 Pickup
3633 f4 PICKUP 55.50 .. 64.50 Hz 62.00 Hz f4 Pickup
3634 T f4 0.00 .. 600.00 sec 30.00 sec T f4 Time Delay
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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English