<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>As distinct from radial electric power lines, in closed loops the consumers are fed from two sides. This is advantageous from the viewpoint of supply reliability, power quality and its losses; however, these are the least only when a loop is uniform, which is not always met in practice. In a non-uniform loop a circulating current flows, and the losses increase proportionally to its square. To reduce losses in such a non-uniform loop, the circulating current should be eliminated. For this purpose a booster transformer can be used. The voltage of such a transformer is known to be in quadrature to the phase voltage; the present consideration has shown that such orientation of the opposing voltage gives the best results only when all loads in the loop are active, otherwise the angle of opposing voltage should be regulated. The voltage value should also be regulated depending on the load. Another technique consists in introducing a complementary reactance into the terminal branches. Such reactance should be regulated if loads are changing in time disproportionately with respect to each other. The best results are achieved when all loop node loads have the same cosφ. If the complementary reactance calculated at one end of the loop is positive, then that calculated at the second end of the loop will be negative, and vice versa. The appropriate choice can be made, in particular, involving both loop terminals.</p></abstract>

As distinct from radial electric power lines, in closed loops the consumers are fed from two sides. This is advantageous from the viewpoint of supply reliability, power quality and its losses; however, these are the least only when a loop is uniform, which is not always met in practice. In a non-uniform loop a circulating current flows, and the losses increase proportionally to its square. To reduce losses in such a non-uniform loop, the circulating current should be eliminated. For this purpose a booster transformer can be used. The voltage of such a transformer is known to be in quadrature to the phase voltage; the present consideration has shown that such orientation of the opposing voltage gives the best results only when all loads in the loop are active, otherwise the angle of opposing voltage should be regulated. The voltage value should also be regulated depending on the load. Another technique consists in introducing a complementary reactance into the terminal branches. Such reactance should be regulated if loads are changing in time disproportionately with respect to each other. The best results are achieved when all loop node loads have the same cosφ. If the complementary reactance calculated at one end of the loop is positive, then that calculated at the second end of the loop will be negative, and vice versa. The appropriate choice can be made, in particular, involving both loop terminals.

A Ringed Non-Uniform Network: How to Raise its Efficiency

Riga Technical University, 1 Kronvalda Blvd., Riga, LV-1010, LATVIA

Latvian Journal of Physics and Technical Sciences

{"article-title":"A Ringed Non-Uniform Network: How to Raise its Efficiency"}

As distinct from radial electric power lines, in closed loops the consumers are fed from two sides. This is advantageous from the viewpoint of supply...

A Ringed Non-Uniform Network: How to Raise its Efficiency

Publié en ligne: 20 janv. 2009

Pages: 20 - 32

DOI: https://doi.org/10.2478/v10047-008-0030-6

Mots clés
circulating current, non-uniform networks, quadrature booster transformer, power losses

This content is open access.

A Ringed Non-Uniform Network: How to Raise its Efficiency

Publié en ligne: 20 janv. 2009

Pages: 20 - 32

DOI: https://doi.org/10.2478/v10047-008-0030-6

Mots cléscirculating current, non-uniform networks, quadrature booster transformer, power losses

This content is open access.

Mots clés
circulating current, non-uniform networks, quadrature booster transformer, power losses