One-way conduction device, DC grounding protection device and method
A protection device and DC grounding technology, applied in the field of rail transit, can solve problems such as expanded fault range, operational troubles, and lack of selectivity
Active Publication Date: 2022-06-21
CRSC RESEARCH & DESIGN INSTITUTE GROUP CO LTD
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Problems solved by technology
However, when the positive pole is short-circuited, the negative pole-to-ground voltage of multiple traction stations near the fault point will exceed 200V, correspondingly, all feeder circuit breakers in multiple traction stations will trip, and even the feeders of the entire traction station will trip, resulting in the expansion of the fault range.
Therefore, although this solution can detect faults, it is not selective, and cannot accurately determine the fault area, expand the fault range, and cause great trouble to the operation.
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[0043] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0044] As used herein, "comprising," "including," "having," "containing," and the like, are open-ended terms, meaning including but not limited to.
[0045] As used herein, "plurality" includes "two" and "two or more."
[0046] Please refer to figure 2 , figure 2 It is a schematic diagram of the DC grounding protection scheme a...
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The invention belongs to the technical field of rail transit, and specifically discloses a one-way conducting device, a DC grounding protection device and a method. The one-way conducting device is used in a DC grounding protection device of a straddling monorail power supply system. It is permanently connected between the ground network and the negative busbar of the traction station, and the leakage current is monitored by the one-way conducting device. After reaching the alarm value, the one-way conducting device sends out an alarm signal but does not trip the DC feeder circuit breaker. The invention not only can detect faults, but also has better selectivity, and can also judge the fault interval without causing the fault range to expand.
Description
technical field [0001] The invention belongs to the technical field of rail transportation, and in particular, particularly relates to a one-way conduction device, a DC grounding protection device and a method for a straddle type monorail power supply system. Background technique [0002] Straddle-type monorail power supply system generally adopts DC 1500V traction power supply system, and the traction network consists of positive power supply rail and negative return rail. The power supply rail and return rail are installed on both sides of the track beam. During normal operation, the power supply rail is used to supply power to the train. The negative return rail returns to the negative pole of the traction station. The positive power supply rail and the negative return rail are installed with the same level of insulation and horizontal insulation. In the straddle-type monorail power supply system, in order to quickly detect the fault when the positive pole is short-circui...
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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 王俊潘卫国王江丽张乐萌郭小敏周韬杨志伟
Owner CRSC RESEARCH & DESIGN INSTITUTE GROUP CO LTD