13
current room temperature for reference.
5. Rated frequency: 50Hz or 60Hz
6. Maximum test voltage: The equivalent voltage under the maximum frequency of output
while testing
7. Maximum test current: The maximum AC current of output while testing
2.2.3 Test Results
Test results interface as shown in Fig 2.8
Fig 2.8 PT’s test results interface
According to different voltage transformer type and experiment item, the results will
be also different. The detailed as shown in Table 2.5.
Table 2.5 PT test results description
result
description
P
M
Resistanc
e
resistance
（
25
℃）
R
unit
：
Ω
，
resistance value under current
temperature.
√
√
resistance
（
75
℃）
ref
R
unit
：
Ω,Resistance value under reference
temperature(the temperature is variable).
√
√
excitation
knee voltage and
knee current
unit:V and A
，
According to standard
definition
，
when knee voltage increase
10%,knee current increase 50%.
√
√
Ratio
Ratio
Actual current ratio under rated burden
√
√
Turns ratio
The ratio of actual secondary winding and
primary winding.
√
√
