Network-side circuit of electric locomotive unit

Abstract

The invention discloses a network-side circuit of an electric locomotive unit, which comprises two network-side circuit bodies with pantographs. Each network-side circuit body consists of a high-voltage transformer, the pantograph, a high-voltage isolating switch, a main circuit breaker, a grounding switch, a lightning arrestor, a primary-side high-voltage current transformer, a transformer, a primary-side grounding current transformer and a shaft end grounding device. The high-voltage circuit of the electric locomotive unit further comprises a high-voltage circuit body without a pantograph, the high-voltage circuit consists of a main circuit breaker, a grounding switch, a lightning arrestor, a primary-side high-voltage current transformer, a transformer, a primary-side grounding current transformer and a shaft end grounding device. The three high-voltage circuit bodies are connected by roof high-voltage buses and high-voltage connecting cables. The network-side circuit of the electric locomotive unit can meet the requirement of heavy-load and high-power traction, an optional network-side high-voltage electric component can be isolated when breaking down, and power loss of an integral locomotive is minimized assuredly after fault isolation.

Description

technical field [0001] The invention relates to the field of rail transit, in particular to a network side circuit of an electric locomotive. Background technique [0002] The electric locomotive obtains electric energy from the power supply network through the pantograph, and supplies power to the locomotive traction system and control system after passing through the main circuit breaker, high-voltage isolating switch, and transformer. [0003] At present, there are three common operating modes of electric locomotives: single locomotive traction, double locomotive externally coupled traction and double locomotive fixed internally coupled traction. The grid-side main circuit structure for traction of a single electric locomotive is as follows: figure 1 As shown, during normal operation, the grid-side current passes through the pantograph E01 (or E02), the high-voltage isolation switch Q03 (or Q04), the main circuit breaker Q01, and the primary winding of the transformer T0...

AI Technical Summary

Problems solved by technology

[0005] Limited by factors such as the current on-off capacity of a single main circuit breaker, transformer capacity, traction converter equipment capacity, and traction motor power, the above-mentioned grid-side circuit cannot meet the requirements of heavy-duty and high-power traction; and the high-voltage electrical components in the above-mentioned grid-side circuit After a fault occurs, the power loss of the vehicle is large, and the availability of the vehicle is low after the fault occurs

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