soegaard
Electrical
- Sep 2, 2005
- 2
Due to new regulations from the Danish transmission accountable (400 / 150 kV), we in the distribution (60 / 10 / 0,4 kV) companies have to ensure that the reactive flow thou the 150 / 60 kV transformer is within defined MVAr limits.
The one side of the problem will resolve it selves, when the consumption of reactive power at 60 kV / 10 kV is above the limits. The consumption of reactive power will be reduced because many overhead lines are exchange with cable. And the cable produced the reactive power that is consumed.
The main problem to operate the MVAr flow within this limit is that we on the 60 / 10 kV voltage level produce too much reactive power. The production of reactive power is 60 kV / 10 kV cable and small combined electric/heat plants (2 MW-100 MW).
So to my question dose some of you have experience with consuming reactive power 20 –30 MVAr at 60 kV?
My idea is to install a reactor with controllable MVAr rating at 60 kV level. The controllable part of the reactor could be variable air gab or a thyristor controlled reactor.
Another idea for consuming reactive power is to use to parallel transformers with unequal tap settings this will produce a circulating current between windings of the parallel transformers and hens absorb reactive power.
The one side of the problem will resolve it selves, when the consumption of reactive power at 60 kV / 10 kV is above the limits. The consumption of reactive power will be reduced because many overhead lines are exchange with cable. And the cable produced the reactive power that is consumed.
The main problem to operate the MVAr flow within this limit is that we on the 60 / 10 kV voltage level produce too much reactive power. The production of reactive power is 60 kV / 10 kV cable and small combined electric/heat plants (2 MW-100 MW).
So to my question dose some of you have experience with consuming reactive power 20 –30 MVAr at 60 kV?
My idea is to install a reactor with controllable MVAr rating at 60 kV level. The controllable part of the reactor could be variable air gab or a thyristor controlled reactor.
Another idea for consuming reactive power is to use to parallel transformers with unequal tap settings this will produce a circulating current between windings of the parallel transformers and hens absorb reactive power.