Operating instructions

69
General
Alongside being highly dynamic, regulated heating processes with power controllers in VSC
connection offer considerable advantages for practical usage in terms of reducing operating costs
through savings in electricity charges. This is a result of
- Considerable reduction in reactive power
- Considerable improvement of power factors
- Significant reduction in grid harmonics.
The Thyro-P…VSC now also provides the user with series power controllers as an option for grid
load optimized, highly dynamic heating processes. Primary or secondary VSC connections in two or
three stage format can be realized.
BASIC CONNECTIONS
PRIMARY VSC
This VSC connection is particularly suitable for large load cur-rents (e.g. I
Load
> I
Controller
) with smaller
voltages. One transformer for each load. The illustrations show the two and three stage VSC con-
nection. Details can be found in the Thyro-P…VSC connecting diagrams.
WARNING
As inherent to their functional principle, a higher voltage occurs than the mains voltage at spots
marked with *. The transformer is to be constructed as there are not more than 690 V present.
Otherwise it can lead to considerable damage to the device.
SECONDARY VSC
This VSC connection is particularly suitable if lots of heaters are being supplied from one transfor-
mer. Through the improvement of the power factor a larger transformer can dispense more active
power and, as such, supply additional loads, if required.
7. MAINS LOAD OPTIMIZATION VSC
R
Last
Trans-
formator
Thyro-P
1P...VSC 2
Netz
U1 U2
V1 V2
R
Load
Trans-
former
Thyro-P
1P...VSC 2
Mains
U1 U2
V1 V2
Sekundäre VSC 2-stufig
2-stage VSC (secondary)
R
Last
Trans-
formator
Thyro-P
1P...VSC 3
Netz
U1 U2
V1 V2
W1 W2
R
Load
Trans-
former
Thyro-P
1P...VSC 3
Mains
U1 U2
V1 V2
W1 W2
Sekundäre VSC 3-stufig
3-stage VSC (secondary)
R
Last
Transformator
Thyro-P
1P...VSC 2
Netz
V1 V2
U1 U2
R
Load
Transformer
Thyro-P
1P...VSC 2
Mains
V1 V2
U1 U2
Primäre VSC 2-stufig
2-stage VSC (primary)
R
Last
Transformator
Thyro-P
1P...VSC 3
Netz
W1 W2
V1 V2
U1 U2
R
Load
Transformer
Thyro-P
1P...VSC 3
Mains
W1 W2
V1 V2
U1 U2
Primäre VSC 3-stufig
3-stage VSC (primary)
* *
*