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Urban rail transit industry

Date:3/10/2015 03:34:07 PM

Application background:

Urban subway traffic harmonic sources can be divided into two major electrical equipment:

1), high voltage 35KV side traction rectifier inverter device generated by the high harmonics, the dominant harmonic is 11 times, 13 times, 23 times 25 times;

2), low voltage 0.4KV side station, interval, depot, control center and other large-scale use of the inverter fan, central air conditioning, frequency conversion elevator, electronic rectifier energy-saving lamps, advertising boxes, UPS and other low-order harmonics, Times, 7 times, 11 times.

Low-voltage side of the natural power factor is low, full load during the day when the reactive power fluctuations;

3), high pressure side of the natural power factor is higher, due to the long supply line, at night when the light load when there is no power back to the phenomenon;

Recommended solution:

Low voltage 0.4KV side directly with DVG digital reactive power generator centralized control, high voltage 35KV side, using APF active filter through the step-up transformer directly connected to the 35KV below the bus, filter high harmonics, two-way adjustment power factor, To prevent reactive power back.

Active filter design capacity = operating current * current distortion rate

Note: In order to make the compensation better, generally leave margin, so the calculated capacity in the maximum load rate of the effective harmonic current multiplied by 1.2 as the final configuration capacity.

Customer benefits:

Reduce the harmonic content, to ensure the safe and stable operation of the subway power supply system;

Power factor safety upgrade, to avoid the fines caused by reactive power;

Energy saving, reduce the cost of rail transit operations.

TypeInfo: Urban rail transit

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