Table of Contents
Advertisement
4.5 Short Circuit Impedance
4.5.1 Principle
The short-circuit impedance/leakage reactance test is helpful in detecting mechanical deformations
in the windings. It is performed by applying AC voltage to each phase on the primary side while
shorting the circuit on the other side. The performed voltage, injected current, and phase difference
will be measured. From the measured values, the short-circuit impedance, leakage reactance, and
AC resistance will be calculated:
Where:
The equivalent three phases short circuit impedance, AC resistance and leakage reactance will be
calculated as follows:
With the Nominal voltage and base power, it is also possible to calculate the values in percents:
90297-0.24 Instruction Manual mini-ATOS
[ Ω ] =
��
��
�� = Applied test voltages for each phase
�� = Test currents for each phase
��
= ���������������� ��ℎ������ �������������� ������������������ ���� ������ℎ ��ℎ������
��
��
= ��ℎ�� ���� �������������������� �������� ������ ������ℎ ��ℎ������
��
��
= ��ℎ�� �������������� ������������������ �������� ������ ������ℎ ��ℎ������
��
1
[ Ω ] =
��
����
6
��
= (��
����
��
[ % ] =
��
����
[ % ] =
��
����
[ % ] =
��
����
Preliminary
��
= (��
+ ����
) [Ω]
��
��
��
(��
+ ��
+ ��
)
��_��
��_��
��_��
+ ����
) [Ω]
����
����
2
��
��
=
��������
��
��������
��
[Ω]
����
× 100%
��
��������
��
[Ω]
����
× 100%
��
��������
��
[Ω]
����
× 100%
��
��������
Page 20 of 125
Advertisement
Table of Contents
Need help?
Do you have a question about the mini-ATOS and is the answer not in the manual?