Power transmission line sub-conductor grouping online ice melting distance protection setting impedance calculation method

Abstract

The invention discloses a power transmission line sub-conductor grouping on-line ice melting distance protection setting impedance calculation method. The method comprises the steps: equally dividing ice melting line multi-split power transmission line conductors into n groups; calculating equivalent resistance and reactance parameters per unit length of the sub-conductor group of the ice melting line group, and calculating to obtain impedance parameters per unit length of the line; calculating the line total impedance when the equivalent total length of the grouped online ice melting lines is l1; calculating unit length equivalent resistance and reactance parameters of the remaining non-ice-melting line, and calculating to obtain equivalent non-ice-melting total length l2 line total impedance; calculating the total impedance of the line; and calculating line distance protection setting impedance. Thus, the problem that in an existing protection method, due to the change of line parameters, line distance protection operation refusal or misoperation is caused is solved.

Description

technical field [0001] The invention belongs to the ice-melting technology of transmission lines, and in particular relates to a method for calculating impedance calculation method for grouping online melting distance protection of sub-conductors of transmission lines. Background technique [0002] Icing of transmission lines in winter is often prone to power outages such as line disconnection and tower collapse, which in turn threatens the safety and stability of the power grid and people's production and life. At present, in the power system, load transfer and power outages are mainly used to implement DC icing for iced transmission lines, which largely solves the threat of icing to the security and stability of the main network of the power system. [0003] With the in-depth research on ice melting technology, scholars have also proposed the online melting of sub-conductor groups for high-voltage transmission lines with split conductors. Since the current of the multi-sp...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for calculating the impedance setting of the on-line melting distance protection of the sub-conductors of the transmission line in groups, so as to solve the problem of refusal or malfunction of the line distance protection caused by the change of the line parameters in the existing protection method

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