KR100844113B1 - Ship receiving supply of electric power from a generating unit or an outside electric power source - Google Patents

Abstract

In a ship (1) having a power generation device (3) for supplying power for its own use and capable of receiving power from an external power source (P), receiving power from the external power source (P) by rotation In the uninterruptible state, when the reel 23 capable of winding or directing the cable 21 for power and the electric power received from the power generator 3 are switched to receive from the external power source P through the cable 21. It is provided with the power supply switching means 51 which can switch.

Power generation device, external power supply, ship, cable, reel, power switching means, signal line, main wire, first breaker, second breaker, external power failure detection means, power supply switching control means, power generation device failure detection means, abnormal signal output means Cable lead detection means, reel control means.

Description

SHIP RECEIVING SUPPLY OF ELECTRIC POWER FROM A GENERATING UNIT OR AN OUTSIDE ELECTRIC POWER SOURCE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship having a power generation device for supplying electric power for use on its own, and which can receive electric power from an external power source. The present invention relates to a ship capable of switching power in an uninterruptible state.

Background Art Conventionally, ships are known which have a power generation device for supplying power for their own use and which can receive power from an external power source (land power source) installed on land.

2 is a diagram showing a schematic configuration of a conventional vessel l00.

The conventional vessel l00 is provided with a power generation device 102, the power generation device 102, through the breaker 104, the main wire for supplying power to the other device of the ship (l00) ( 106 is electrically connected.

An electric supply terminal 110 is provided in the upper deck 108, for example, of the conventional vessel 100, and the electric supply terminal 110 and the main electric wire 106 connect the internal cable 112 of the vessel. Are electrically connected to each other through. The breaker 114 is provided in the middle part of the ship internal cable 112.

When the electric power is supplied from a land power supply facility, a cable 118 is connected between the electric power supply terminal 110 installed in the conventional vessel l00 and the terminal 116 of the land power supply provided on the quay wall. And open the circuit of the circuit breaker 104 (the circuit breaker between the main electric wire 106 and the power generating device 102), and the circuit of the circuit breaker 114 (the circuit breaker between the main electric wire 106 and an external power supply). To close it.

As a technique related to the said prior art, the technique of Unexamined-Japanese-Patent No. 200l-309553 is known, for example.

Depending on the amount of power to be used in the ship, the cable 118 is generally a large diameter and a large mass is used. Therefore, in the conventional vessel l00, the cable 118 prepared on the vessel 100 or the quay wall should be wired using a crane (not shown) installed on the vessel 100 or the quay wall. In order to install the cable 118, there is a problem that a lot of air consumption is consumed.

After the cable 118 is wired, when the power source used by the vessel 100 is switched from the power generation device 102 to the external power source, the circuit of the circuit breaker 114 is opened after the circuit of the circuit breaker 104 is opened. Since the converter was closed, a state in which power was not supplied to the main wire 106 occurred, and there was a problem that a power failure occurred once in the vessel 100.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and includes a power generation device for supplying electric power for use on its own, and in a ship capable of receiving electric power from an external power source, when switching a power supply source, It is an object to provide a vessel which is easy and can switch in an uninterruptible state.

In accordance with a first aspect of the present invention, a ship having a power generation device for supplying power to be used and capable of receiving power from an external power source, comprising a cable for receiving power from the external power source by rotation. Reels that can be wound or directed; And a power switching means capable of switching in an uninterruptible state when switching power received from the power generation device to be received from the external power source through the cable.

In the invention according to the second aspect of the present invention, in the ship according to the first aspect, the power supply switching means performs the switching by lowering a power generation frequency at which the power generation device is generated to be lower than a power supply frequency of the external power supply. It is a ship to perform.

According to a third aspect of the present invention, there is provided a ship according to the second aspect, comprising: a main wire provided on the ship to supply electric power to a device installed on the ship; A first breaker provided at an intermediate portion or end of a cable inside the ship connecting the cable and the main wire to each other; And a second circuit breaker provided at an intermediate portion or an end of a power supply line connecting the power generator and the main wire to each other, wherein the power supply switching unit receives power received from the power generator through the cable. When switching to receive from a power source, the generator speed is controlled to be gradually lowered in a governor, and the generation frequency at which the power generator is generated is slightly lower than the power source frequency of the external power source. And a vessel which opens the converter of the second circuit breaker after closing the converter of the first circuit breaker.

In accordance with a fourth aspect of the present invention, there is provided a power generation device for supplying electric power to be used, and in a ship capable of receiving electric power from an external power source, a cable for receiving electric power from the external power source by rotation. Reels for winding or directing; And a power switching means capable of switching in an uninterruptible state when switching power received from the external power source through the cable to be received from the power generation device.

According to a fifth aspect of the present invention, in the ship according to the fourth aspect, the power supply switching means is configured such that the power generation frequency at which the power generation device is generated is higher than the power supply frequency of the external power supply. It is a ship to perform.

According to a sixth aspect of the present invention, there is provided a vessel according to the fifth aspect, comprising: a main wire provided on the vessel for supplying electric power to a device installed on the vessel; A first breaker provided at an intermediate portion or end of a cable inside the ship connecting the cable and the main wire to each other; And a second circuit breaker provided at an intermediate portion or an end of a power supply line connecting the power generator and the main wire to each other, wherein the power supply switching unit is configured to receive power received from the external power source through the cable from the power generator. When switching to receive, the rotation speed of the generator prime mover is controlled by the governor, the power generation frequency generated by the power generator is slightly higher than the power frequency of the external power source, and after closing the converter of the second breaker, It is a ship which opens the converter of a 1st breaker.

According to a seventh aspect of the present invention, there is provided a ship according to any one of the first to sixth aspects, comprising: external power supply abnormality detecting means capable of detecting an abnormality of the external power supply through a signal line; And when it is detected that an abnormality has occurred in the external power source in the state where power is supplied from the external power source, the operation of the power generator is started, and the power received from the external power source via the cable is generated. And a power switching control means for controlling the power switching means to receive from the device.

According to an eighth aspect of the present invention, there is provided a ship according to any one of the first to seventh aspects, comprising: power generation apparatus abnormality detection means capable of detecting an abnormality of the power generation apparatus; And an abnormal signal output means for outputting a signal for operating the protection circuit of the external power supply to the external power supply via a signal line when the abnormality is detected.

According to a ninth aspect of the present invention, in the ship according to the seventh or eighth aspect, the signal line is a vessel integrated with the cable.

According to a tenth aspect of the present invention, there is provided a ship according to any one of the first to ninth aspects, comprising: cable extension amount detecting means capable of detecting an extension amount of the cable from the reel; And reel control means for stopping rotation of the actuator of the reel when detecting that the extension amount of the cable exceeds a predetermined value.

According to an eleventh aspect of the present invention, in the ship according to any one of the first to tenth aspects, the cable extension amount detecting means capable of detecting the extension amount of the cable from the reel is further provided. And the power supply switching control means switches to receive the power received from the external power supply from the power generation device when it is detected that the cable extension amount exceeds a predetermined value when the electric power is supplied from the external power supply. It is a ship.

1 is a view showing a schematic structure of a ship according to an embodiment of the present invention, showing a state in which the ship is in contact with the quay wall.

2 is a view showing a schematic structure of a conventional vessel.

FIG. 1: shows the schematic structure of the ship 1 which concerns on embodiment of this invention, and is a figure which shows the state which the said ship 1 is in contact with the quay wall Q. As shown in FIG. 1 shows the ship 1 from the front of the ship 1 toward the rear.

The ship 1 has a suitable number of power generation devices 3 for supplying power for its own use, and is configured to be able to receive power from an external power source P.

As the ship 1, assume a passenger ship, a container ship for carrying a refrigerated cargo, etc. compared with a ship with a different power consumption, and, as the external power source P, for example, of a power plant installed on land Assume power generation facilities and the like.

First, each apparatus for supplying electric power to the vessel 1 from the power generator 3 will be described.

The generator 3 includes a generator 5, which is driven by a prime mover such as a diesel engine 7 to generate power.

A governor 9 is provided in the diesel engine 7, and the governor 9 can adjust the rotational speed of the diesel engine 7 under the control of the controller 11. By adjusting the rotational speed of the diesel engine 7, the power generation frequency and phase of the electricity output from the generator 5 (the power generator 3) are controlled.

The main wire 13 is provided in the said ship 1, and supplies electric power to the apparatus (for example, lighting installation, refrigeration installation) installed in the said ship 1 through this main electric wire 13. As shown in FIG. do.

A breaker constituted by, for example, a VCB (Vacuum Circuit Breaker) at an intermediate portion or end of the power supply line 15 connecting the main wire 13 and the power generator 3 (generator 5) to each other ( 17) is installed, and under the control of the control device 11 to open and close the path of the circuit breaker 17, to supply electric power from the generator 5 to the main wire 13 (the vessel 1) and You can stop it.

Below, each apparatus for supplying electric power to the said ship 1 from the said external power supply P is demonstrated.

The socket P1 which is an example of the connection terminal of the external power supply P is provided in the part near the sea of the inner wall Q (for example, the upper surface edge part of the inner wall Q toward the sea side). This socket P1 is connected to the said external power supply P via the cable P3 wired in the ground of the inner wall Q.

By installing the socket P1 and the cable P3 as described above, the container crane for carrying in and out of cargo such as a container to the ship 1 and the cable P3 do not occur, and the container crane is It becomes easy to install in the quay wall Q.

In the ship 1, a reel 23 is formed which is rotated by an actuator such as an electric motor 19 to wind or unwind a cable 21 for receiving electric power from the external power source P. At the distal end of the cable 21, a plug 25, which is an example of the ship 1 side connection terminal, is provided.

 The reel 23 is provided on the upper side of the ship of the vessel 1 on the side in contact with the inner wall Q. In other words, the plug 25 of the cable 21 is released from the reel 23 so that the plug 25 provided at the tip of the cable 21 is provided with a socket of an external power supply P provided on the inner wall Q. The said reel 23 is provided in the installation position of P1) or the position which reaches easily to the vicinity.

More specifically, the rotation center axis of the reel 23 is directed in the front-rear direction of the ship 1, and the reel 23 rotates in a predetermined direction, whereby the cable 21 causes the crest wall ( Q) It is released downward of the side.

In the vicinity of the reel 23, a guide member 27 is provided at the site where the cable 21 is unwound so that the cable 21 can be unwound or wound flexibly.

The reel 23 is rotated to release the cable 21, and the cable 21 is directed as shown by the dashed-dotted line in FIG. 1, and the plug 25 reaches the place where the socket P1 is located.

After the plug 25 reaches the place where the socket P1 is located, the operator connects the plug 25 to the socket P1.

The ship 1 is provided with an electricity supply panel 29 having a plug 31, and the socket 35 provided at the distal end of the other cable 33 produced from the reel 23 is connected to the plug. By connecting to 31, electric power can be supplied from the external power supply P to the electric supply panel 29.

The cable 33 is a different cable from the cable 21 wound on the reel 23, and is not unwound from the reel 23 by the rotation of the reel 23, and is not wound on the reel 23. Do not. The cable 21 and the other cable 33 are connected to each other through a slip ring or the like installed on the reel 23.

VCB, for example, inside the electricity supply panel 29 at an intermediate portion of the ship internal cable 37 connecting the plug 31 (the respective cables 21 and 33) to the main wire 13. The circuit breaker 39 is installed, and the circuit breaker 41 is installed in series with the circuit breaker 39 on the main wire 13 side in the middle of the ship internal cable 37.

Under the control of the control device 11, by opening and closing the paths of the breakers 39 and 41, the main electric wire 13 (the above) from the external power supply P through the cables 21 and 33 and the like. Supplying power to the vessel (1), it is possible to stop the supply of power.

Each of the breakers 39 and 41 may be installed at the end of the ship internal cable 37. Since VCB is employed as the circuit breaker, even a high voltage (for example, a voltage of 6600 V) can be reliably cut off.

In FIG. 1, only one cable 21 and 33 and one ship internal cable 37 are shown, but a plurality of cables 21 and 33 and a ship internal cable 37 are paralleled in accordance with the power consumption of the ship 1. The reel 23 and the circuit breakers 39 and 41 may be provided in this way. In the case where a plurality of reels 23 are provided, the reel structure can be simplified by arranging the reels side by side so that the rotational center axes of the reels coincide with each other, and rotating the drive by one electric motor 19.

Next, the reel 23 will be described in more detail.

The reel 23 is rotationally driven by a remote control. That is, under the control of the motor controller 43, the electric motor 19 is rotated by the remote control, and the reel 23 is rotated.

The reel 23 is provided with cable directing amount detecting means 45 capable of detecting the directing amount of the cable 21 unwinded from the reel 23, and the directing amount of the cable 21 is predetermined. When it is detected that the value exceeds, the rotation of the electric motor 19 of the reel 23 is stopped under the control of the motor controller 43.

A signal line connecting the vessel 1 and the external power source P to each other will be described.

The signal line is for transferring information between the vessel 1 and the external power source P, and is formed of, for example, an optical fiber.

The signal line is provided integrally with the cables 21, 33, and P1. That is, for example, a power supply line for supplying power and the optical fiber are arranged side by side inside the outer shell of each of the cables 21, 33, and P1.

When the plug 25 is inserted into the socket P1, the signal line provided on the cable 2l and the signal line provided on the cable P3 are connected to each other.

Even when the socket 35 is inserted into the plug 31, the signal line provided on the cable 33 and the signal line provided on the plug 31 are connected to each other.

The signal line is wired away from the power supply line inside the plug 31 (inside of the electrical supply panel 29), and the power supply line constitutes the ship internal cable 37 as described above, and the breaker 39 ) Is connected.

The signal line to be separated away is connected to an optical converter 47 capable of converting an optical signal into an electrical signal and an electrical signal into an optical signal, and the optical converter 47 is connected to a control device (PLC 49). 11). Information exchange is possible between the control device 11 and the external power source P (protection circuit or control device of external power source P described later).

The power switching means 51 which switches the power supply source of the said ship 1 is demonstrated.

 When the ship 1 is receiving power from the power generation device 5, the power source switching means 51 is connected to the external power source by the ship 1 through the cables 21, 33, 37. When switching to receive from P), when the vessel 1 is receiving power from the external power source P via the respective cables 21, 33, 37, the vessel 1 generates the power. When switching to receive from the device 5, it is possible means for switching in an uninterruptible state.

More specifically, the switching means 51 is, for example, a power generation frequency detection means (not shown) capable of detecting the power generation frequency of the power generation device 3, and the electricity generated by the power generation device 3. A power generation device phase detection means (not shown) capable of detecting a phase of an external power supply phase detection means (not shown) capable of detecting a phase of the external power supply P, and a power supply frequency of the external power supply. An external power source frequency detecting means (not shown) that can be detected is provided.

When switching the power received from the power generator 3 to receive from the external power source P through the cables 21, 33, 37, the power generation device 3 detected by the power generation frequency detecting means The power generation frequency and the power source frequency of the external power source P detected by the external power source frequency detecting means are continuously compared in the control device 11, and the number of revolutions of the diesel engine 7 of the power generation device 3 is determined. It is controlled to lower gradually in the governor 9 so that the power generation frequency at which the power generation device 3 is generated is slightly lower than the power frequency of the external power source P.

As described above, the power generation frequency at which the power generation device 3 is generated is slightly lower than the power supply frequency of the external power supply P, the circuits of each of the circuit breakers 39 and 41 that are open are closed (the power is supplied to the external device). After closing the circuits of the circuit breakers 39 and 41 and closing the circuits of the circuit breakers 39 and 41, the circuits of the circuit breakers 17 which are closed are opened (electric power is supplied to the power generator 3). Switching is performed so as not to be supplied from the main wire 13 to the main wire 13).

After the switching, the operation of the power generator 3 (diesel engine 7) is stopped.

On the other hand, in the case of switching to receive the power received from the external power source P from the power generator 3 through the respective cables 21, 33, 37, the operation of the power generator 3 is started and the The power generation device continuously comparing the power generation frequency of the power generation device 3 detected by the power generation frequency detection means with the power supply frequency of the external power supply P detected by the external power supply frequency detection means in the control device 11. The rotation speed of the diesel engine 7 of (3) is controlled by the governor 9 so that the power generation frequency generated by the power generator 3 is slightly higher than the power frequency of the external power supply P.

As described above, the power generation frequency at which the power generation device 3 is generated is set slightly higher than the power supply frequency of the external power supply P, and the converter of the circuit breaker 17 that is open is closed and then closed. The circuits of the breakers 39 and 41 are opened to perform switching.

The phases of the power generation device 3 detected by the power generation device phase detection means and the phase of the external power supply P detected by the external power supply phase detection means are compared with the control device 11, respectively. When the respective switching is performed when they coincide with each other, more flexible switching can be performed so that the waveform of the power supplied to the ship 1 is not disturbed.

If the respective switching is performed when the voltage of the power generator 3 and the voltage of the external power supply P almost coincide with each other, more flexible switching can be performed.

If the power source frequency of the external power source P is already known, the external power source frequency detecting means may be deleted.

Next, control when an abnormality occurs in the external power supply P or the like will be described.

An external power source capable of detecting an abnormality of the external power source P, for example, in the control device 11 of the vessel 1 through signal lines provided in the cables 21, 33, and P3. When an abnormality detection means (not shown) is provided and it detects that an abnormality has occurred in the external power source P while the electric power is supplied from the external power source P, the operation of the power generator 3 is stopped. A power switching control means for controlling the power switching means 51 so as to receive from the power generation device 3 power received from the external power supply P through each of the cables 21, 33, 37. Not installed).

For example, the control device 11 of the vessel 1 is provided with power generation device abnormality detection means (not shown) capable of detecting an abnormality of the power generation device 3, and detects the above abnormality. In one case, an abnormal signal output means (not shown) for outputting a signal for operating the protection circuit (not shown) of the external power source P to the external power source P through the signal line is provided.

Further, when the cable extension amount detecting means 45 detects that the extension amount of the cable 21 exceeds a predetermined value when the electric power is supplied from the external power source P, the power supply switching means 51 ) Is switched to receive the power received from the external power source (P) from the generator (3).

Next, operation | movement in the case of switching the power supply of the said ship 1 from the power generation apparatus 3 to the external power supply P is demonstrated.

It demonstrates from the state immediately after the ship 1 contacted the quay wall Q. FIG.

First, the operator rotates the reel 23 by remote control, releases the cable 21 until the plug 25 goes to the socket P1, and inserts the plug 25 into the socket P1. Put it in.

Subsequently, the control device 11 controls to gradually lower the rotation speed of the diesel engine 7 of the power generation device 3, and the power generation frequency of the power generation device 3 is the power source frequency of the external power supply P. The circuits of the circuit breakers 39 and 41 that are open are closed, and then the circuits of the circuit breakers 17 that are closed are opened.

Next, operation | movement in the case of switching the power supply of the said ship 1 from the external power supply P to the generator 3 is demonstrated.

First, the control device 11 operates the power generator 3 to control the number of revolutions of the diesel engine 7 of the power generator 3 so that the power generation frequency at which the power generator 3 is generated is generated. The converter is closed at the open circuit breaker 17 so as to be slightly higher than the power supply frequency of the external power supply P, and then the open circuits at each of the closed circuit breakers 39 and 41 are opened.

Subsequently, the operator pulls out the plug 25 from the socket P1, and rotates the reel 23 by the remote control to wind the cable 21.

According to the ship 1, the reel 23 which can wind or produce the cable 21 for receiving electric power from the said external power supply P by rotating the electric motor 19, and the said power generation apparatus 3 In the case of switching the power received from the external power P via the cable 21, the power supply switching means 51 capable of switching in the uninterruptible state is provided. It is not necessary to wire this cable using a crane (not shown) installed on a ship or a quay wall, and the cable 21 is released from the reel 23 and an external power supply terminal provided on the quay wall Q. Since it is only necessary to connect to (P1), the installation (wiring) work of the cable 21 is simplified, the installation of the cable 21 is facilitated, and the power supply source of the ship 1 can be switched in the uninterrupted state.

In the case of switching the electric power received from the external power source P via the cable 21 to be received from the power generator 3, the cable 21 can be easily dismantled in the same manner. It is possible to switch the power supply of the ship 1 in an uninterrupted state.

That is, according to the ship 1, when switching the power supply source, switching operation is easy and it can switch in an uninterruptible state.

Since the power supply source can be switched in an uninterruptible state, the electric equipment used in the vessel 1 can be used as it is without interruption even during the switching.

Since the reel 23 is provided on the upper side of the ship of the vessel 1 on the side in contact with the inner wall Q, that is, the cable 21 is released from the reel 23 and the tip of the cable 21 is terminated. Since the reel 23 is installed at a position where the plug 25 of the plug 25 can easily reach the place where the socket P1 of the external power supply P provided on the inner wall Q is located, the cable Installation work of (21) becomes simple. In addition, as in the prior art, there is no need to separately install a crane for installing cables on the quay wall or the ship.

In addition, when the electric power is not supplied from the external power source P, the cable 21 can be wound around the reel 23 and stored therein, so that the cable 21 does not interfere with the external power source P. In order to receive power from the power supply, the cable 21 can be unwound and produced immediately.

On the other hand, when the ship 1 is anchored in the port (when the ship 1 is in contact with the quay wall Q), since the electric power can be supplied from the external power source P of the land, the ship 1 It is not necessary to operate the power generator 3, no noise or exhaust gas is emitted from the power generator 3, and environmental degradation around the port can be prevented.

According to the ship 1, since the said switching is performed by making the power generation frequency of the said power generation device 3 lower than the power supply frequency of the said external power supply P, from the said power generation device 3 to the said external power supply P. Current reverse flow can be prevented.

Moreover, according to the ship 1, when switching so that electric power received from the said electric generator 3 may be received from the said external power supply P via the said cable 21, the diesel engine 7 of the said electric generator 3 The number of revolutions is controlled to be lowered gradually, and the power generation frequency of the power generator 3 is slightly lower than the power frequency of the external power supply P, so that it is supplied from the power generator 3 to the main wire 13. The frequency of the power supply does not change suddenly, and it is possible to prevent the overcurrent from flowing through the main wire 13 or another device connected thereto.

Moreover, according to the ship 1, when it detects that abnormality has occurred in the said external power supply P in the state in which electric power is supplied from the said external power supply P, operation | movement of the said power generation apparatus 3 starts. At the same time, since the power received from the external power source P is automatically switched to receive from the power generation device 3, even when an abnormality occurs in the external power source P and supply of power is impossible, the ship 1 Power outages can be prevented.

Moreover, according to the ship 1, when the abnormality of the said generator 3 is detected, since the signal for operating the protection circuit of the said external power supply P is output to the said external power supply P, the said power generating device The occurrence of a failure or a problem in the external power supply P due to the abnormality in (3) can be prevented in advance.

In addition, according to the ship 1, since the said signal line is integrally provided with the said cable, the said signal line can also be provided when installing the cable 21, and it is not necessary to provide the said signal line separately.

In addition, when the tip plug 25 of the cable 21 of the reel 23 is connected to the socket P1 of the external power supply P provided on the inner wall, the signal line is also connected, so that the signal line is connected. There is no need to perform the separate operation, and the situation of forgetting the connection of the signal line can be avoided.

Moreover, according to the ship 1, when it detects that the extension amount of the said cable 21 exceeds predetermined value, since the rotation of the electric motor 19 of the said reel 23 is stopped, The cable 21 can be prevented from being damaged due to an excessive amount of drawing.

In addition, in order to facilitate the installation (directing from the reel 23) and the dismantling (winding up to the reel 23) of the cable 21, the reel 23 is driven by a remote control operation. Since the operator may operate the reel 23 at a position away from the reel 23, it is difficult for the operator to check the cable 21 extension amount from the reel 23 at any time.

However, as described above, when it is detected that the extension amount of the cable 21 exceeds a predetermined value, the rotation of the electric motor 19 of the reel 23 is stopped, so that the operator draws the cable 21. Even if it is difficult to judge the state, damage to the cable 21 due to an incorrect operation of the operator can be prevented in advance.

Moreover, according to the ship 1, when it detects that the extension amount of the said cable 21 exceeds the predetermined value, when the electric power is supplied from the said external power supply P, the said power supply switching control means 51 will The electric power received from the external power source P is switched to receive from the generator 3.

Therefore, for some reason, when the electric power is being supplied from the external power source P, the ship 1 is further than a predetermined distance from the quay wall Q, for example, a plug at the tip of the cable 21. Even when the situation in which 25 is removed from the socket P1 of the quay wall Q occurs, power supply to the vessel 1 can be continued by uninterrupted switching.

On the other hand, when it is detected that the amount of directing of the cable 21 exceeds a predetermined value when the electric power is supplied from the external power source P, an alarm is used by the alarm device under the control of the control device 11. May be issued and the main breaker may be cut off.

In addition, when it is detected that the extension amount of the cable 21 exceeds a predetermined value when the electric power is supplied from the external power source P, the protection circuit of the external power source P is operated via the signal line. May be output from the control device 11 to the external power source P. When the protection circuit of the external power supply P is activated and the power supply from the external power supply P is stopped, the problem caused by the disconnection of the cable 21 is solved even if the cable 21 is disconnected. It can be avoided from occurring.

On the other hand, the entire contents of Japanese Patent Application No. 2004-212163 (filed Jul. 20, 2004) are incorporated herein by reference.

In addition, this invention is not limited to the Example of above-mentioned invention, It can implement in another aspect by changing suitably.

According to the present invention, when switching the source of power supply, the switching operation is easy and can be switched in the uninterruptible state.

Claims (11)

In a ship having a power generation device for supplying power for use, which can receive power from an external power source, A reel capable of winding or directing a cable for receiving power from the external power source by rotation; And Power switching means capable of switching in an uninterruptible state when switching power received from the power generation device to be received from the external power source through the cable; And And the power supply switching means performs the switching by lowering a power generation frequency generated by the power generation device to a power supply frequency of the external power supply. The method of claim 1, A main wire installed on the ship to supply electric power to the equipment installed on the ship; A first breaker provided at an intermediate portion or end of a cable inside the ship connecting the cable and the main wire to each other; And Second breaker provided in the middle part or end part of the power supply line which connects the said generator and said main electric wire with each other Further provided, The power supply switching means controls the power generator rotation speed to be gradually lowered by a governor when switching power received from the power generator to be received from the external power source through the cable. A ship characterized in that the power generation frequency at which the power generation device is generating is slightly lower than the power frequency of the external power source, and after the converter of the first breaker is closed, the converter of the second breaker is opened.  In a ship having a power generation device for supplying power for use, which can receive power from an external power source, A reel capable of winding or directing a cable for receiving power from the external power source by rotation; And Power switching means capable of switching in an uninterruptible state when switching power received from the external power supply through the cable to be received from the power generation device; And The power supply switching means performs the switching by making a power generation frequency at which the power generation device generates power higher than a power supply frequency of the external power supply. The method of claim 3, A main wire installed on the ship to supply electric power to the equipment installed on the ship; A first breaker provided at an intermediate portion or end of a cable inside the ship connecting the cable and the main wire to each other; And A second circuit breaker provided at an intermediate portion or an end of a power supply line connecting the power generator and the main wire to each other; Equipped with When switching the power supply means to receive the power received from the external power source from the power generation device via the cable, the governor controls the rotation speed of the power generator prime mover to determine the power generation frequency at which the power generation device generates power. The vessel characterized in that slightly higher than the power source frequency of the external power source, and after closing the converter of the second breaker, the converter of the first breaker is opened. The method according to any one of claims 1 to 4, External power supply abnormality detecting means capable of detecting an abnormality of the external power supply via a signal line; And When it is detected that an abnormality has occurred in the external power supply in the state where power is supplied from the external power supply, the operation of the power generator is started, and the power received from the external power supply through the cable is received. Power switching control means for controlling the power switching means to receive from the Ship further comprising a. The method according to any one of claims 1 to 4, Power generation device abnormality detection means capable of detecting an abnormality in the power generation device; And When the abnormality is detected, abnormal signal output means for outputting a signal for operating the protection circuit of the external power supply to the external power supply via a signal line is provided. A ship further comprising. The method of claim 5, Said signal line is integrated with the said cable, and is installed, The ship characterized by the above-mentioned. The method according to any one of claims 1 to 4, Cable extension amount detecting means capable of detecting an extension amount of the cable from the reel; And Reel control means for stopping the rotation of the actuator of the reel when detecting that the extension amount of the cable exceeds a predetermined value Ship further comprising a. The method according to any one of claims 1 to 4, Further comprising cable extension amount detecting means capable of detecting the extension amount of the cable from the reel, When it is detected that the cable extension amount exceeds a predetermined value when the electric power is supplied from the external power supply, the power supply switching control means switches to receive power received from the external power supply from the power generation device. 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