Application of fiber-optic measuring current transformer in control and relay protection systems of belt conveyor drives

Abstract

Abstract Until recently, control and protection systems used electromagnetic current transformers as information sensors. Due to the nonlinearity of the magnetization curve of the magnetic circuit, such current transformers cannot fundamentally provide satisfactory metrological characteristics in transient conditions, as well as after passing short-circuit currents when the magnetic circuit of the current transformer is deeply saturated with the aperiodic component of the short-circuit current. This is the main disadvantage of electromagnetic current transformers, which complicates and makes unreliable operation of control systems and protection of asynchronous conveyor motors. The article suggests the use of optoelectronic current transformers as information sensors for control and protection systems of Induction Motor.