Direct current distribution fuse circuit

Abstract

The utility model discloses a direct current distribution fuse circuit belongs to direct current distribution technical field. Including first busbar propulsion unit, first busbar propulsion unit is connected with second busbar propulsion unit series through bus isolation unit, inverter output end in first busbar propulsion unit, inverter output end in second busbar propulsion unit is connected alternating -current load, and bus isolation unit includes bus disconnecting switch and the fuse that is connected with its series, and the fuse's other end connects the bus of first busbar propulsion unit, and the other end of bus disconnecting switch connects the bus of second busbar propulsion unit, makes first busbar propulsion unit and second busbar propulsion unit form two independent propulsion branch. The utility model discloses when first busbar propulsion unit or second busbar propulsion unit anyone cannot power supply, and bus disconnecting switch is closed automatically, and the power supply of using normal working busbar propulsion unit, ensures that ship equipment can normally operate.

Description

Technical Field

[0001] This utility model belongs to the field of DC power distribution technology, and specifically relates to a DC power distribution fuse circuit. Background Technology

[0002] Current shipboard electrical systems generally adopt an AC power distribution architecture. The core power supply mode is as follows: the electrical energy output from the diesel AC generator set is converted by a transformer and then supplied to all ship loads through a tiered AC distribution cabinet and cable network. A typical system consists of multiple diesel generators connected in parallel, a main switchboard, transformers, and various AC electrical equipment.

[0003] DC power distribution lines have low losses, high transmission efficiency, and save on line corridor space. Compared to traditional AC power distribution systems, DC power distribution systems are easier to expand and isolate faults. Theoretically, DC power distribution systems do not need to transmit reactive power and, in principle, do not require reactive power compensation, thus reducing corresponding equipment investment. However, existing DC power distribution lines typically only use one set of propulsion. When a DC power distribution line fails, the equipment must be shut down for repair, affecting the operation of the entire ship. Utility Model Content

[0004] Purpose of the utility model: To provide a DC power distribution fuse circuit that solves the above-mentioned problems existing in the prior art.

[0005] Technical Solution: A DC power distribution fuse circuit includes a first bus propulsion unit, in which the inverter output is connected to the ship's AC load. The first bus propulsion unit is connected in series with a second bus propulsion unit via a bus tie isolation unit. The inverter output of the second bus propulsion unit is also connected to the ship's AC load. The bus tie isolation unit includes a bus tie disconnect switch and a fuse FU7 connected in series therewith. The other end of the fuse FU7 is connected to the bus of the first bus propulsion unit, and the other end of the bus tie disconnect switch is connected to the bus of the second bus propulsion unit, thus forming two independent propulsion branches for the first and second bus propulsion units. When either the first or second bus propulsion unit fails, the bus tie disconnect switch automatically closes.

[0006] Preferably, the first busbar push unit includes circuit breaker QS1, circuit breaker QS3, circuit breaker QS5, fuse FU1, fuse FU3, fuse FU5, a first inverter, filter L1, diode D1, and capacitor C1. One end of circuit breaker QS1 is connected to circuit breaker QS3, circuit breaker QS5, and fuse FU7. The other end of circuit breaker QS1 is connected to one end of fuse FU1. The other end of fuse FU1 is connected to the first busbar cabinet. The other end of circuit breaker QS3 is connected to one end of fuse FU3. The other end of fuse FU3 is connected to the first push inverter. The other end of circuit breaker QS5 is connected to one end of fuse FU5. The other end of fuse FU5 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is connected to both capacitor C1 and the DC terminal of the first inverter. The AC terminal of the first inverter is connected to one end of filter L1. The other end of filter L1 is connected to the first isolation transformer.

[0007] Preferably, the first inverter is an NXI0105 model inverter, the filter L1 is a SIN-0075 model filter, the circuit breaker QS1 is an NSX250NA DC 4P 250A model circuit breaker, the circuit breaker QS3 is an NSX160NA DC 4P 160A model circuit breaker, the circuit breaker QS5 is an NSX100NA DC 4P 100A model circuit breaker, the fuse FU1 is a 170M3468 model circuit breaker, the fuse FU3 is a 170M3467 model circuit breaker, and the fuse FU5 is a 170M3464 model circuit breaker.

[0008] Preferably, the second busbar drive unit includes circuit breaker QS2, circuit breaker QS4, circuit breaker QS6, fuse FU2, fuse FU4, fuse FU6, a second inverter, filter L2, diode D2, and capacitor C2. One end of circuit breaker QS2 is connected to circuit breaker QS4, circuit breaker QS6, and bus tie disconnect switch. The other end of circuit breaker QS2 is connected to one end of fuse FU2. The other end of fuse FU2 is connected to the second busbar cabinet. The other end of circuit breaker QS4 is connected to one end of fuse FU4. The other end of fuse FU4 is connected to the second drive inverter. The other end of circuit breaker QS6 is connected to one end of fuse FU6. The other end of fuse FU6 is connected to the positive terminal of diode D2. The negative terminal of diode D2 is connected to capacitor C2 and the DC terminal of the second inverter. The AC terminal of the second inverter is connected to one end of filter L2. The other end of filter L2 is connected to the second isolation transformer.

[0009] Preferably, circuit breaker QS2 is an NSX250NA 4P+MOE model circuit breaker, circuit breaker QS4 is an NSX160NA DC 4P model circuit breaker, circuit breaker QS6 is an NSX100NA DC 4P model circuit breaker, fuse FU2 is a 170M3468 model fuse, fuse FU4 is a 170M3467 model fuse, fuse FU6 is a 170M3464 model fuse, the second inverter is an NXI0105 model inverter, and filter L2 is a SIN-0075 model filter.

[0010] Preferably, the bus tie disconnector is an NSX400 DC 4P+MOE model bus tie disconnector.

[0011] Beneficial effects: This utility model relates to a DC power distribution fuse circuit. By connecting the first busbar propulsion unit, the bus tie isolation unit, and the second busbar propulsion unit in series, both the first and second busbar propulsion units are connected to the ship's AC load. That is, the AC load is powered by the independent first and second busbar propulsion units. If either the first or second busbar propulsion unit fails and cannot provide power, the bus tie isolation switch automatically closes, and the power can be supplied by the working busbar propulsion unit, ensuring the normal operation of the ship's equipment. Attached Figure Description

[0012] Figure 1 This is the overall circuit diagram of this utility model. Detailed Implementation

[0013] like Figure 1 As shown, this utility model provides a technical solution: a DC power distribution fuse circuit, including a first bus propulsion unit, in which the inverter output terminal is connected to the ship's AC load. The first bus propulsion unit is connected in series with a second bus propulsion unit through a bus tie isolation unit. The inverter output terminal of the second bus propulsion unit is also connected to the ship's AC load. By connecting the first bus propulsion unit, the bus tie isolation unit, and the second bus propulsion unit in series, both the first and second bus propulsion units are connected to the ship's AC load. That is, the AC load is powered by the independent first and second bus propulsion units. If either the first or second bus propulsion unit fails and cannot supply power, the bus tie isolation unit automatically closes. At this time, the first and second bus propulsion units are connected in series, and the power supply can be provided by the working bus propulsion unit, ensuring the normal operation of the ship's equipment.

[0014] In a further embodiment, the bus tie isolation unit includes a bus tie disconnect switch and a fuse FU7 connected in series therewith. The bus tie disconnect switch is an NSX400 DC 4P+MOE type bus tie disconnect switch. The other end of the fuse FU7 is connected to the bus of the first busbar drive unit, and the other end of the bus tie disconnect switch is connected to the bus of the second busbar drive unit, so that the first busbar drive unit and the second busbar drive unit form two independent drive branches. When the first busbar drive unit or the second busbar drive unit fails, the bus tie disconnect switch automatically closes, and the first busbar drive unit and the second busbar drive unit are connected in series, so that the power can be supplied by the busbar drive unit that is in normal working order.

[0015] In a further embodiment, the first busbar drive unit includes circuit breakers QS1, QS3, and QS5, fuses FU1, FU3, and FU5, a first inverter, filter L1, diode D1, and capacitor C1. The first inverter is an NXI0105 model inverter, the filter L1 is a SIN-0075 model filter, circuit breaker QS1 is an NSX250NA DC 4P 250A model circuit breaker, circuit breaker QS3 is an NSX160NA DC 4P 160A model circuit breaker, and circuit breaker QS5 is an NSX100NA DC 4P The circuit breaker is a 100A model. Fuse FU1 is a 170M3468 model, fuse FU3 is a 170M3467 model, and fuse FU5 is a 170M3464 model. One end of circuit breaker QS1 is connected to circuit breakers QS3, QS5, and fuse FU7. The other end of circuit breaker QS1 is connected to one end of fuse FU1. The other end of fuse FU1 is connected to the first combiner cabinet. The other end of circuit breaker QS3 is connected to one end of fuse FU3, the other end of fuse FU3 is connected to the first drive inverter, the other end of circuit breaker QS5 is connected to one end of fuse FU5, the other end of fuse FU5 is connected to the positive terminal of diode D1, the negative terminal of diode D1 is connected to both capacitor C1 and the DC terminal of the first inverter, the AC terminal of the first inverter is connected to one end of filter L1, and the other end of filter L1 is connected to the first isolation transformer.

[0016] In a further embodiment, the second busbar drive unit includes circuit breakers QS2, QS4, and QS6, fuses FU2, FU4, and FU6, a second inverter, filter L2, diode D2, and capacitor C2. Circuit breaker QS2 is an NSX250NA 4P+MOE type circuit breaker, circuit breaker QS4 is an NSX160NA DC 4P type circuit breaker, and circuit breaker QS6 is an NSX100NA DC type circuit breaker. The circuit breaker is a 4P type. Fuse FU2 uses a 170M3468 model fuse, fuse FU4 uses a 170M3467 model fuse, and fuse FU6 uses a 170M3464 model fuse. The second inverter is an NXI0105 model inverter, and filter L2 is a SIN-0075 model filter. One end of circuit breaker QS2 is connected to circuit breakers QS4 and QS6, as well as the bus tie disconnect switch. The other end of circuit breaker QS2 is connected to one end of fuse FU2. The other end of fuse FU2 is connected to the No. 2 combiner cabinet. The other end of circuit breaker QS4 is connected to one end of fuse FU4. The other end of fuse FU4 is connected to the No. 2 push inverter. The other end of circuit breaker QS6 is connected to one end of fuse FU6. The other end of fuse FU6 is connected to the positive terminal of diode D2. The negative terminal of diode D2 is connected to both capacitor C2 and the DC terminal of the second inverter. The AC terminal of the second inverter is connected to one end of filter L2. The other end of filter L2 is connected to the No. 2 isolation transformer.

[0017] Through the above technical solution, this utility model can achieve the following working process:

[0018] When the bus tie disconnect switch is open, the first bus propulsion unit and the second bus propulsion unit independently supply power to the ship's AC load equipment. When the first bus propulsion unit or the second bus propulsion unit fails, the bus tie disconnect switch automatically closes. At this time, the first bus propulsion unit and the second bus propulsion unit are connected in series, meaning that the bus propulsion unit that is in normal operation can supply power to the ship's AC load normally, ensuring that the ship's load equipment can work normally.

[0019] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A direct current power distribution fuse circuit, characterized by, The system includes a first busbar propulsion unit, in which the inverter output is connected to the ship's AC load. The first busbar propulsion unit is connected in series with a second busbar propulsion unit via a bus tie isolation unit. The inverter output of the second busbar propulsion unit is also connected to the ship's AC load. The bus tie isolation unit includes a bus tie disconnect switch and a fuse FU7 connected in series therewith. The other end of the fuse FU7 is connected to the busbar of the first busbar propulsion unit, and the other end of the bus tie disconnect switch is connected to the busbar of the second busbar propulsion unit, forming two independent propulsion branches. When either the first or second busbar propulsion unit fails, the bus tie disconnect switch automatically closes. The first busbar propulsion unit includes circuit breakers QS1 and QS3. The circuit consists of circuit breaker QS5, fuses FU1, FU3, FU5, a first inverter, filter L1, diode D1, and capacitor C1. One end of circuit breaker QS1 is connected to circuit breakers QS3, QS5, and fuse FU7. The other end of circuit breaker QS1 is connected to one end of fuse FU1. The other end of fuse FU1 is connected to the first combiner cabinet. The other end of circuit breaker QS3 is connected to one end of fuse FU3. The other end of fuse FU3 is connected to the first push inverter. The other end of circuit breaker QS5 is connected to one end of fuse FU5. The other end of fuse FU5 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is connected to both capacitor C1 and the DC terminal of the first inverter. The AC terminal of the first inverter is connected to one end of filter L1. The other end of filter L1 is connected to the first isolation transformer.

2. A direct current distribution fuse circuit according to claim 1, characterized in that The first inverter is an NXI0105 model inverter, the filter L1 is a SIN-0075 model filter, the circuit breaker QS1 is an NSX250NA DC 4P 250A model circuit breaker, the circuit breaker QS3 is an NSX160NA DC 4P 160A model circuit breaker, the circuit breaker QS5 is an NSX100NA DC 4P 100A model circuit breaker, the fuse FU1 is a 170M3468 model circuit breaker, the fuse FU3 is a 170M3467 model circuit breaker, and the fuse FU5 is a 170M3464 model circuit breaker.

3. A direct current distribution fuse circuit according to claim 1, wherein The second busbar drive unit includes circuit breakers QS2, QS4, and QS6, fuses FU2, FU4, and FU6, a second inverter, filter L2, diode D2, and capacitor C2. One end of circuit breaker QS2 is connected to circuit breakers QS4, QS6, and the bus tie disconnect switch. The other end of circuit breaker QS2 is connected to one end of fuse FU2, which is connected to the second busbar cabinet. The other end of circuit breaker QS4 is connected to one end of fuse FU4, which is connected to the second drive inverter. The other end of circuit breaker QS6 is connected to one end of fuse FU6, which is connected to the positive terminal of diode D2. The negative terminal of diode D2 is connected to capacitor C2 and the DC terminal of the second inverter. The AC terminal of the second inverter is connected to one end of filter L2, and the other end of filter L2 is connected to the second isolation transformer.

4. A direct current distribution fuse circuit according to claim 3, wherein The circuit breaker QS2 is an NSX250NA 4P+MOE model circuit breaker, the circuit breaker QS4 is an NSX160NA DC 4P model circuit breaker, the circuit breaker QS6 is an NSX100NA DC 4P model circuit breaker, the fuse FU2 is a 170M3468 model fuse, the fuse FU4 is a 170M3467 model fuse, the fuse FU6 is a 170M3464 model fuse, the second inverter is an NXI0105 model inverter, and the filter L2 is a SIN-0075 model filter.

5. A direct current distribution fuse circuit according to claim 1, wherein, The bus tie disconnector is an NSX400 DC 4P+MOE model bus tie disconnector.

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