KR101103859B1 - Electrical distribution system with bow thruster connected to single generator for large container ship - Google Patents

Abstract

This system is applicable to ships with similar capacity of large container ship's generator and Bow thruster motor. The conventional large container ship's power distribution system is transformed into 6600V system or Bow thruster motor connected to a single generator. Can be changed to In other words, for the parallel operation of up to four conventional generators, the 6600V power distribution system should be used.However, the system of starting with a single thruster system of the Bau thruster motor can operate as a 440V power distribution system by calculating the short circuit current because three generators are operated in parallel. . With this change in power distribution system, alternator specifications, motor specifications for the main lubrication pump, motors for main transformers and refrigerated containers are not required, and image transformers and earth leakage relays are installed at each refrigeration container distribution panel for ground detection. , No need for 440V section board installation for refrigerated container, transformer installation for bow thruster, 440V switchboard installation instead of 6600V switch board, specially designed bow thruster motor suitable for starting characteristics, auto thial type and direct operation The application of the Bow thruster starting panel facility system, which can be locked, not only greatly simplifies the ship's equipment by changing the design of the equipment, but also the advantages of maintenance and repair due to the facility simplification, and the voltage drop by starting the single generator of the bow thruster motor. Also provides ship operators with the advantages of stable electrical system The.

Bow Thruster, Single Generator, Container Ship, Distribution System

Description

Electrical distribution system with bow thruster connected to single generator for large container ship}

1 is a distribution system of a conventional large container ship,

2 is a generator operating mode of a conventional large container ship power distribution system,

3 is a distribution system of a large container ship of the present invention,

4 is a generator operating mode of the container ship power distribution system of the present invention,

5A is a comparison of operation modes of the conventional system and the present invention;

FIG. 5B is a comparison of the difference between the operation mode of the present invention and the conventional system following FIG. 5A;

The present invention relates to a power distribution system applicable to a ship having a similar capacity of a large container ship and a capacity of a bow thruster motor. More specifically, the three generators are parallel as a system that enables the start of the bow thruster motor with a single generator. The present invention relates to a Bow thruster single generator connection distribution system of a large container ship that enables operation to reduce the short-circuit current value to be a 440V distribution system.

The conventional inboard distribution system for large container ships is a 6600V power generation system with a schematic single line diagram as shown in FIG. 1, and is composed of a 6600V switchboard, a 440V switchboard, and a 220V switchboard, and has a large capacity. The master and main LO pump motors are connected directly to the main bus on the 6600V switchboard and the rest of the loads are powered by a 440V decompressed system using a derating transformer.

At this time, the generator operation mode is as shown in FIG. In this case, the bow thrust motor can be started even when three generators are in operation.

Since four generators must be operated for the operation of the conventional Bow thruster motor in the normal state as described above, in such a system, four generators connected to the main bus are required to operate in parallel. To do this, according to the calculation of short-circuit current in parallel operation of four generators, the generator's generated voltage and main bus line should not be 440V system and should be 6600V system. Except for large motors such as bow thrusters used in ships, the voltage of general equipment is mainly 440V, so the voltage developed to 6600V is reduced to a transformer and used as 440V. This system has the disadvantage that the equipment of the ship is increased and complicated.

The present invention was created in order to solve the above-mentioned conventional problems, and the bow thrust motor can be started by a designated generator alone, and the bow thrust switching and interlocking circuit shown in FIG. And even in various operating conditions, such as Figure 5b is designed without any inconvenience compared to the existing system, the design changes of the devices thereby greatly simplify the vessel's equipment, the benefits of maintenance and repair according to the simplified equipment and bow thruster It is an object of the present invention to provide a distribution system for connecting a Bow thruster single generator with a large container to reduce the voltage drop generated during the start-up of a motor by a motor and to build a stable electric system.

The present invention for achieving the above object is a 440V power generation system of a single-line diagram (Schematic Single Line Diagram) as shown in Figure 3 in the inboard distribution system of a large container ship, consisting of a 440V switchboard and 220V switchboard, 440V Various loads are directly connected to the main busbar, and the bow thruster motor is connected to the main busbar and also directly connected by a one-to-one connection switch with a single generator. It is about the system.

The construction and the operation of the embodiment of the present invention to accomplish the object as described above and to perform the task for eliminating the conventional drawbacks will be described in detail with reference to the accompanying drawings.

3 is a distribution system of a large container ship according to the present invention, which is a 440V power generation system with a schematic single line diagram, and is composed of a 440V switchboard and a 220V switchboard, and various loads are applied to the 440V main bus. Directly connected, the Bow thruster motor is connected to the main busbar, but directly connected by a one-to-one connection switch with a single generator.

4 shows a generator operation mode of the present invention, in which a Bow thruster motor is normally started as a single generator (D / G1), and when the generator (D / G1) is broken, the system is started by the remaining three generators. . At this time, the automatic voltage regulator (hereinafter referred to as AVR) of the single generator (D / G1) for starting the bow thruster motor automatically generates a constant current for deceleration starting using the constant current. Voltage regulator. In addition, the Bau thruster motor is specially designed to co-operate with the constant current characteristics of the generator AVR when the single generator starts.

The difference from the conventional method is that in the case of the parallel operation of the four conventional generators, the low voltage (440V) system cannot be designed due to the high value of the three-phase short-circuit current value, but it is designed as a 6600V system. Only D / G2, D / G3, D / g4) are operated in parallel and the Bau thrust motor starting sole generator is a system separated from the main bus, and the short-circuit current value in the case of 3-phase short circuit is low, so it is designed as a low voltage (440V) system. Would be possible. This changes the overall design.

The difference between the equipment and the conventional system is as follows.

The conventional system consists of four generators (2800 kW, 6600 V, 10 p, IP44, general AVR), while the present invention consists of three first generators (2800 kW, 450 V, 10 p, IP44, general AVR) and one. It is composed of two second generators (composed of 2800kW, 450V, 10p, IP44, Constant Current Type AVR).

Meanwhile, the motor for the main lubrication pump (Main L. O. Pump) is changed from 2 units of 6600V, 320kW to 2 units of 440V, 320kW.

3600KVA, 6600 / 440V, 3Ph, two peripheral pressures used in the conventional system are not necessary in the present invention, and 440V section boards for refrigerated containers, six are also not necessary in the present invention.

In addition, six 1800KVA, 6600 / 440V, 3PH, 6 refrigeration container transformers are also unnecessary, and each refrigeration container switchboard for the ground detection is provided with an image transformer and an earth leakage meter.

On the other hand, one Bow thruster transformer (3125 KVA, 3 Ph, 440/6600 V, 1 hour rating), which was not necessary in the conventional system, is required in the case of the present invention.

In addition, 6600V switch board of the conventional system (4 power generation bases, 1 busty panel 1, main transformer panel 2, refrigerated container feeder panel 6, bow thrust panel 1, main lubrication pump (Main LO Pump) feeder and group starter panel 2, DC110V distribution panel 2) Instead of the 440V switchboard (main transformer 440V inlet 2), instead of the 440V switchboard (4 power generation bases, 1 busty panel 1, interlocking panel 1, refrigerated container feeder panel 6, bow thruster panel 1, main lubrication pump (Main) LO Pump) was changed to feeder and group equipment 2), and instead of the conventional bow thruster motor, it was changed to 150 m starting torque of double squirrel and specially designed motor of 500% starting current. It is used by changing the starting panel of the type, and having the function of auto-teal type and direct-initiated starting.

The difference between the operation mode of the conventional system and the present invention is as shown in Figs. 5a and 5b, there is no inconvenience when driving to solve the problem using interlocking.

In addition, when applying the Bow thruster motor starting system as a single generator, the relationship between the generator and the motor,

Motor output (kW) / motor efficiency = motor input power (kW)

It is sufficient that the generator output (kW) is greater than the motor input power (kW).

In terms of power factor, the power factor of the generator is 0.75 ~ 0.8 and the power factor of the large motor is about 0.82. Therefore, it is sufficient if the generator output (kW) is larger than the motor input power (kW) even when calculating the same kW.

If the motor is operated at a power factor of 0.82, the power factor is also 0.82 in the generator, and the generator has a margin of 0.75 to 0.8 when designing the generator.

For example, if the Bow thruster motor has a capacity of 2500 kW and the efficiency of the motor is 0.95, the motor input power (kW) is 2500 / 0.95 = 2631 kW, so that a generator capacity of 2631 kW or more, that is, about 2700 kW, is sufficient.

Therefore, it is applicable to a large container ship in which the size of the bow thruster motor and the generator capacity as described above are established.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

The effects of the present invention that can be expected by the configuration and action as described above are as follows.

Since the power generation system of large container ships is not 6600V system but 440V system, there is no need to install 6600V switchboard, voltage reducing transformer, etc. It is advantageous in terms of maintenance, and it can also eliminate the voltage drop that occurs when the bow thruster starts during operation of the ship, there is an advantage that can contribute to the stability of the onboard electrical system.

Claims (2)

In shipboard distribution system of large container, Three first generators (consisting of general AVR) D / G2, D / G3 and D / G4 connected in parallel with each other; and One second generator (consisting of a constant current type AVR) D / G1 connected in parallel with the D / G2, D / G3, and D / G4; and A main bus line for supplying a voltage of 440V to the loads of the D / G2, D / G3 and D / G4 and the D / G1; and A bow thruster motor connected to the main busbar and connected to the D / G1 by a switch; and A bow thruster dedicated transformer for converting a voltage of 440V supplied to the bow thruster motor to a voltage of 6.6KV; and A load for 440V connected to the main bus; 220V load connected to the main bus; And And a 220V transformer for converting a voltage between the main bus and the 220V load. The bow thruster motor is usually driven by the second generator D / G1 alone, and when the failure of the D / G1 is driven by the D / G2, D / G3 and D / G4, The bow thruster motor has a function of an auto-teal type and a direct inlet start and interlocking, the bow thruster single generator connection distribution system of a large container ship. The method of claim 1, The Bow thruster motor has a capacity of more than 2300kW, the generator has a capacity of more than 2500kW, and the quantity is four units.

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