A high-power medium-voltage DC dry-type load device with on-line monitoring function

Abstract

The invention discloses a high-power medium-voltage DC dry-type load device with on-line monitoring function, which mainly includes: a load main circuit, including several parallel load branches; a plurality of voltage sensors, respectively arranged on the load main circuit The positive and negative poles of the loop and the midpoint of each load branch are respectively used to collect the ground voltages of the positive and negative poles of the load main circuit and the midpoint of the load branch; the monitoring unit is used to receive the voltage collected by the voltage sensor data, and analyze and calculate the collected data, automatically and accurately judge and locate the fault of a load branch; the control terminal is used to receive the monitoring results of the monitoring unit, and to monitor the status of the main load circuit in real time, accurate monitoring. The high-power medium-voltage DC dry-type load device with online monitoring function of the present invention can realize the advantages of self-diagnosis, fault location and real-time monitoring.

Description

technical field [0001] The invention relates to the field of high-power medium-voltage DC dry-type loads, in particular to a high-power medium-voltage DC dry-type load device with an online monitoring function. Background technique [0002] With the development of modern science and technology, direct current is widely used in various fields of industry, and high-power medium-voltage direct current power generation technology for ships has developed rapidly. Therefore, how to inspect the quality and safety of the medium-voltage DC power supply of marine high-power generator sets is particularly important. [0003] At present, the equipment used to test the performance of medium-voltage DC generator sets at home and abroad is mainly dry-type DC loads. Due to its outstanding features such as high power density and high load regulation accuracy, dry-type DC loads are widely used in performance testing of marine medium-voltage DC generator sets. [0004] In the actual operatio...

AI Technical Summary

Problems solved by technology

[0004] In the actual operation of the existing medium-voltage DC load, when the positive or negative pole of the load has a non-metallic contact with the ground or even a metal short circuit, the load itself does not have self-diagnosis and alarm functions, so that the load equipment operates with a fault. It greatly affects the operation safety of generator sets and load equipment

At the same time, since there is no online monitoring device dedicated to the medium-voltage DC system on the market, the operating status of the DC dry load cannot be monitored in real time, which greatly increases the safety risk of the load operation.

At the same time, because the main circuit of the DC dry load is composed of many resistance wires connected in series and parallel, often one or more of the resistance wires is blown and it is not easy to be found, which will cause the remaining resistance wires to be damaged under the condition of overvoltage and overcurrent. operation, drastically shortening the service life of the entire load

Moreover, as the power of marine generator sets increases, it is often necessary to run one or more medium-voltage DC dry-type loads in parallel to meet the load requirements of the unit. When one of the loads fails, the existing load Technology cannot accurately locate faults, which greatly increases the difficulty of on-site troubleshooting for test operators

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