标准号:IS 7700-1975
发布日期:1975/8/1 12:00:00
实施日期:1999/12/31 12:00:00
适用范围:1.1 This standard covers natural air-cooled quadrature phase-shifting voltage transformers to be used in conjunction with 3-phase kvarh meters used for measuring reactive energy.1.2 This standard does not cover phase-shifting voltage transformers producing:a) a variable phase shift either continuously or in steps, andb) a phase shift other than 90° with respect to the input voltages.