Siemens EK 726 Series Manual de Serviço descarregar pdf (Página 60)

ENGINEERING INFORMATION AND INSTRUCTIONS

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

Version D 3/36

Calculating a line reactor using an example.

= short-circuit rating of the transformer as a %

= rated apparent transformer rating

= system fault level

= ratio between the drive inverter rated power / system fault level (impedance)

= drive inverter power

[The apparent power of the drive inverter (S

drive inverter

= Ö3 * V * I

drive inverter

) can be neglected for this calculation, refer to the

values in brackets]

Calculation example: S

= (100 / u

) * P

= (100% / S

) * P

Transformer 1 V = 400V; S

= 100KVA; u

= 4%; drive inverter MDV 45000/3 =45KW (~ 58KVA)

= (100% / u

) * P

= (100% / 4%) * 100KVA = 2500KVA

= (100% / S

) * P

= (100% / 2500) * 45 = 1.8% (~ 2.3%) In this case, a line reactor is not required

Transformer 2 V = 400V; S

= 500KVA; u

= 4%; drive inverter MDV 45000/3 =45KW (~ 58KVA)

= (100% / u

) * S

= (100% / 4%) * 500KVA = 12500KVA

= (100% / S

) * P

= (100% / 12500) * 45 = 0.36% (~ 0.4%) In this case, a line reactor is required

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Siemens EK 726 Series Manual de Serviço Página 60