Medium-low voltage DC power distribution network bus protection system and method
A DC bus, bus protection technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problem of no DC current protection principle bus internal and external fault discussion and other issues, to improve overall reliability and rapidity, processing The effect of low computing power requirements and cost reduction
Pending Publication Date: 2019-11-19
NR ELECTRIC CO LTD +2
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[0008] The above method has certain limitations:
[0012] Method (4) can effectively eliminate noise and interference signals, but there is no further discussion on the principle of DC current protection and how to distinguish faults inside and outside the bus zone
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[0037] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0038] Such as figure 1As shown, the present invention provides a medium and low voltage DC distribution network busbar protection system, including a DC current transformer 1, a DC current transformer 2, a DC busbar protection device, an incoming line switch and an outgoing line switch, which are respectively introduced below.
[0039] The DC current transformer 1 is arranged on the DC switch side of the DC bus incoming line, the output signal of the DC current transformer 1 is connected to the DC bus protection device (hereinafter referred to as the protection device), and the protection device measures the incoming line current;
[0040] The signal collected by the DC current transformer 1 is used for the backup protection of the busbar protection device to prevent the protection device from tripping the incoming l...
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The invention discloses a medium-low voltage DC power distribution network bus protection system and method. The system is characterized in that a first DC current transformer is configured at a DC bus incoming line DC switch side; a second direct-current current transformer is arranged near the direct-current bus, an incoming line passes through the second direct-current current transformer forwards, and one or more outgoing lines pass through the second direct-current current transformer reversely; incoming line tripping output signals of the direct-current bus protection device are connected with incoming line switch opening input ends, and outgoing line tripping output signals of the direct-current bus protection device are connected with outgoing line switch opening input ends. According to the technical scheme, rapid detection, positioning and isolation can be achieved when a bus fault occurs in a direct-current power distribution system, positioning and isolation can be performed when a bus fault just occurs and does not reach a steady state, communication between adjacent areas is not needed, the current of each line on the DC bus does not need to be collected, the configuration cost is reduced, the requirement on the processing operation capability of the system is relatively low, and the overall reliability and rapidity of the DC power distribution system can be improved.
Description
technical field [0001] The invention belongs to the technical field of DC power distribution in electric power systems, and in particular relates to a busbar protection system and a protection method for a medium-low voltage DC power distribution network system of 20kV or below. Background technique [0002] With the increase of power demand in domestic cities and the increasing proportion of distributed power sources and DC loads, it is increasingly difficult for traditional AC distribution networks to meet economical access to distributed power sources and DC loads, further increase the power supply radius, and increase power supply. capacity needs. At the same time, due to the advantages of good controllability, convenient access to renewable energy, high power transmission quality, large power supply radius and large transmission power, DC distribution network has become a hot spot in academic research in recent years. [0003] The DC power distribution system is very d...
Claims
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IPC IPC(8): H02H7/22
CPCH02H7/22
Inventor 曾先锋侯炜陈俊王文龙石勇刘永生王霄翔王杰王栎涛
Owner NR ELECTRIC CO LTD