cn

The power frequency magnetic field immunity test is applied in China particularly to electricity meters, current and voltage transducers, and the protection and control equipment installed in substations, because the Chinese network carries very large currents and much equipment is mounted close to busbars and to the conductors of switchgear cubicles. The requirement reaches manufacturers through the Chinese product standards for metering equipment and through the specifications of the network operators for substation apparatus, and the field level is selected according to the installation position rather than applied uniformly. The test is continuous during application, so a product that is affected shows a steady measurement or control error instead of an intermittent fault, which makes it particularly relevant to instruments whose accuracy is part of their specification. The Chinese text follows the international document, and this page identifies the Chinese designation used in domestic specifications.

GB/T 17626.8 standard satisfiable test: Multifunction Immunity Tester 、 Magnetic Field Immunity 。
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