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The differential protection of the transformer, generator, or transmission line under normal operating conditions may misoperate when the adjacent transformer is switched-on. To research the cause of the misoperations, impacting factors, such as magnetizing inrush, sympathetic inrush, and current-transformer saturation are analyzed based on the field-recorded fault data and the simulation results...
Under the existing 3/2 connection mode, the incompletion between the configuration of the protection and transformer leads to the existence of the dead zone. When the fault occurs in the dead zone, line protection and breaker failure protection are generally matched with each other to achieve the complete isolation of the fault. This approach will make the scope of the circuit breaker to expand, and...
The phenomenon of sympathetic interaction between transformers is discussed in this paper. A mathematical model is developed for two transformers in parallel and in series operation to analyze the origin mechanism of sympathetic interaction. At the same time, its characteristics are further analyzed by numerical simulation. The sympathetic inrush current could influence the transformer differential...
As two form of differential protection applied dominantly, phasor value based differential protection is easily influenced by current transformer saturation, and sampled value based differential protection must improve the performance response to slight internal faults. In this paper, multi different protection which combines phasor value based differential protection with sampled value based differential...
MCT connected in circuit alters internal electrical parameters of generator. This means the generator mathematical model isn't identical with the generator in experiment. This makes the generator modeling more complicated. Rogowski coil doesn't contact with measured circuit. It won't change parameters of generator. Based on simulation and experiment, the paper introduces a current sensor composed...
Applying Rogowski coil in power system is very attractive because of its numerous merits. A good accuracy can be achieved when Rogowski coil is used for metering. But the response to transient fault current should be studied when Rogowski coil is used for relay. This paper analyses the transient performance of Rogowski coil with ideal integrator. The analysis shows it has excellent transient performance...
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