Voltage sensor
VS High-Precision Voltage Transducer
Wide-bandwidth measurement range
Clearly defined phase-angle error specification
Conventional voltage transducers only specify ratio error and provide no phase-angle rating; they are thus suitable only for stand-alone voltage measurement. When the transducer is used for power measurement, however, the phase-angle error becomes a critical factor affecting accuracy. The VS series voltage transducers feature a clearly defined phase-angle specification, with a typical phase displacement as low as 1 arc-minute, making them the preferred choice for power-measurement applications.
The table below lists the power-measurement error caused by a 10′ phase-angle error (≈0.0029 rad, equivalent to the error limit of a class 0.2 electromagnetic transformer) as the phase angle varies from 0° to 90°：
Serial Number |
Phase angle(°) |
cos Φ |
tan Φ |
Power error caused by phase-angle deviation (%) |
1 |
30 |
0.866 |
0.5774 |
0.17 |
2 |
60 |
0.5 |
1.7321 |
0.5 |
3 |
78.5 |
0.1994 |
4.9152 |
1.4 |
4 |
87.1 |
0.0506 |
19.74 |
5.7 |
5 |
88.9 |
0.0192 |
52.081 |
15 |
As shown in the table, phase-angle error has a significant impact on power measurements, becoming especially pronounced under low power-factor conditions. The VS high-precision voltage transducer delivers a typical phase displacement of only 2 arc-minutes, an outstanding specification that effectively safeguards power-measurement accuracy.
