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The transmission form of two-circuit lines on the same tower has been increasingly widely used in the actual power grid. With the increase of wires, the space electric field of transmission lines becomes more and more complex. Research shows that the space electric field of transmission lines will be affected by many factors, such as tower structure, wire properties and phase sequence arrangement...
This paper proposes the idea of evaluation system, with trend and loss evaluation model of secondary device set up, which is useful for equipment condition monitoring and assessment in smart substation. Multi-parameter identification method is firstly introduced, by “horizontal comparison and longitudinal check”, the correction of device state can be guaranteed. Standard of score for different parameters...
Due to the technique and economic considerations, transmission lines in the power grid are usually untransposed, which leads to the result that the line parameter is asymmetric. For double-circuit lines on the same tower, asymmetric line parameters may cause unbalanced currents even under normal operation, which will have a negative impact on the line temperature, line loss and even relay protections...
With interoperation and interconnectivity of intelligent electronic devices (IEDs) in smart substations increasing, switch networks in smart substations are gradually becoming difficult to manage and maintain. This paper presents a dynamic topology discovery method tailored for smart substation networks based on MAC address matching, which goes beyond topology discovery algorithms for conventional...
Fiber Optic Current Transformer (FOCT) realizes current measurement by using the Faraday magneto-optical effect. With advantage of unsaturation, wide dynamic range and immunity to electromagnetic interference etc, FOCT is widely used in smart substation and HVDC transmission, so the accuracy of measurement and reliability of long-term operated have become the focus of attention[1–3]. In this paper...
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