# Calculation of negative sequence impedance (in %) for Generator

Rating of 3phase generator is as follows-

MVA-605MVA

Rated pf=0.85 lag

Rated voltage- 20 KV

Rated current-17465

Direct Axis Synchronous reactance(Xd)= 193%

Quadrature axis synchronous reactance (Xq)= 234%

Negative Sequence reactanceX2= 19.4%

Zero Sequence reactance = 12.6%

Resistance of stator winding per phase = 0.00131 ohm

This 3 phase Generator is connected with three single phase transformers. Rating for R phase transformer is as follows-

MVA-200MVA

Voltage ratio= 21KV/420KV

Vector group- YNd1

Short circuit impedance(positive sequence) = 13.5%

Zero sequence impedance= 13.5%

whereas Ratings of other Y and B transformer are same . which is as follows

MVA-200MVA

Voltage ratio- 20KV/400KV

HV current = 873.6

LV current =10083

Vector Group-YNd1

Short circuit impedance (positive sequence )= 14.5%

Short circuit impedance (zero sequence )=14.5%

HV side of these transformers are connected with Grid .calculate negative sequence impedance of generator in % because of unbalance in transformer rating.

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( 1 ulasan ) Sonebhadra, India

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