porcelain knob
1.First of all the differences between photoelectric current / voltage transformer elements in HV and UHV switchgear assembly and independent electric device of conventional open porcelain knob photoelectric current / voltage transformer are described in this paper,then the photoelectric current / voltage transformer elements in HV and UHV switchgear assembly are classified,and the working principle and technical performances of photoelectric current / voltage transformer elements in 500 kV switchgear assembly abroad are introduced in detail.
