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The loads unbalance problem and solution.

The solution of the unbalance problem under three-phase and single-phase loads simultaneously is the difficult task. Besides at the limited power the phase unbalance tends to the unreasonable increase of diesel generator power and as a result to the increase of minimal load capacity.

The solution is the installation of three-phase balancing transformer between DGS and electrical customer.

The transformer removes the unbalance under customer electric supply from diesel generator set or power grid. At the same time it accepts the 100% load unbalance. The maximum single-phase power provided by balancing transformer at diesel generator supply is not over 65% of DGS power under no load of two other phases.

The main technical parameters of transformer is written on tables 1,2.

Table 1

nominal load power, кVА 10;16;25;40;63;100;160;200;250;400; 630;1000
Nominal frequency, Hz 50
Nominal line voltage, В 380
Primary winding nominal current, А 15;24;39;60;96;150;240;300;375;600; 950;1500
Load current unbalance, % 100
Heat resistance class В
Overload class according to ГОСТ 12.2.007.0 01

Table 2

Output power , кVА Overall dimensions, mm Weight, кг
10 420х300х410 50
16 65
25 70
40 550х350х500 95
63 110
100 160
160 800х420х680 250
200 290
250 320
300 850х500х870 370
400 430
630 1230х840х1020 740
1000 850
.

Besides the main function is phase load balance the transformer has the additional functions:

  1. The transformation of three-phase grid into single-phase one:
    • - with galvanic separation between the supply grid and customer;
    • - with galvanic separation between the supply grid and customer and changing (increase or reduce)of output voltage;
    • - without galvanic separation between the supply grid and customer and changing (increase or reduce)of output voltage;
    • - without galvanic separation between the supply grid and customer;
  2. transformation of three-phase three-wire grid into three-phase fought-wire grid (i.e. making of the neutral wire to connect with phase load).

The weight and dimension characteristics for balancing transformers which transform three-phase grid into single-phase one without galvanic separation (ТСТ-О) are written on table 3.

Table 3

Output power , кVА Overall dimensions, mm Weight, кг
10 420х300х410 80
16 100
25 550х350х500 115
40 140
63 800х420х680 210
100 305
160 850х500х870 410
200 650
250 1230х840х1020 720
300 805
400 910
.

Weight and dimension characteristics for balancing transformers which transform of three-phase grid into single-phase one with galvanic separation (ТСТ-О) are written on table 4.

Table 4

Output power , кVА Overall dimensions, mm Weight, кг
10 420х300х410 110
16 550х350х500 180
25 800х420х680 290
40 400
63 540
100 850х500х870 680
160 910
200 1230
250 1230х840х1020 1520
300 1680
400 2150
.

The transformation of three-phase grid into single-phase one is actual at the connection with single-phase loads located at a high distance from power supply (DGS and others). Moreover three-phase grid capacity is three times higher than single-phase one. This lets transfer higher power or reduce the supply cable section.

DGS
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