Heavy current testing device and method for extra-high voltage deicing isolating switch

Abstract

The invention discloses a heavy current testing device and method for an extra-high voltage deicing isolating switch. The heavy current testing device comprises a voltage regulator, a plurality of switches, a plurality of voltage-transforming and rectifying components, a current measuring device for measuring the current of a sample loop, and a temperature measuring device for measuring the temperature of a sample. The output of the voltage regulator comprises a plurality of branches. Each branch is provided with the corresponding switch in series connection with the corresponding voltage-transforming and rectifying component. The output ends of the voltage-transforming and rectifying components are connected together and are connected in parallel with the sample. The method comprises: setting a maximum temperature rise value; measuring the temperature rise of the sample within a certain time; determining whether the temperature rise of the sample reaches a temperature rise limit and determining the number of the voltage-transforming and rectifying components required to introduced; lowering the output of the voltage regulator and adjusting current; determining whether the temperature rise of the sample reaches the temperature rise limit; acquiring thermally stable limited temperature rise and limited current; and evaluating a current-flowing capability. The heavy current testing device is easy to operate, high in test current, and fine in adjustment, may simulate the current-flowing characteristic of the extra-high voltage deicing isolating switch, and provides a reference for real deicing.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and relates to a test device and a test method for a high-current test of an UHV ice-melting isolating switch. Background technique [0002] With the development of my country's electric power industry, the UHV power grid has gradually become the backbone grid of the entire power grid, and its transmission reliability is particularly important. Tripping or down tower disconnection, once such accidents occur, will lead to large-scale power outages. [0003] At present, the most economical and effective way to reduce the loss of transmission line ice damage is to carry out current ice melting work on transmission lines. UHV lines use multi-split conductors with large wire diameters and high reactance. DC ice melting is given priority. The current needed to melt ice is high, generally above 10,000A, and the current will produce serious thermal effects when melting ice, which puts forw...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a test device and test method for the high-current test of the UHV ice-melting isolating switch in view of the defect that the current flow capacity test of the existing isolating switch is difficult to meet the test of the UHV ice-melting isolating switch Through experiments, the temperature rise of the UHV ice-melting isolation switch under different currents and the corresponding current value at the limit temperature rise are obtained, which provides useful information for safe and reliable UHV ice-melting work. Resilience barrier

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