CN219304195U - Marine medium-voltage autotransformer distribution device - Google Patents

Abstract

The utility model provides a marine medium-voltage autotransformer power distribution device which comprises a first switch cabinet, a second switch cabinet and at least one autotransformer cabinet, wherein the first switch cabinet and the second switch cabinet are respectively arranged adjacent to the at least one autotransformer, the first switch cabinet is used for connecting an incoming cable and a load cable, a first contactor is arranged in the first switch cabinet, the first contactor is a medium-voltage contactor, the first end of the first contactor is connected to a power supply, and the second end of the first contactor is connected to a motor; a second contactor is arranged in the second switch cabinet, and the second contactor is a medium-voltage contactor; an autotransformer is arranged in at least one autotransformer cabinet, the autotransformer is three-phase, and each of the three phases comprises a first end, a second end and a third end of the autotransformer. The power distribution device of the marine medium-voltage autotransformer provided by the utility model has the advantages of simple and reliable structure, stable performance, strong environment adaptation capability, compact overall volume and lower cost.

Description

Marine medium-voltage autotransformer distribution device

Technical Field

The embodiment of the utility model relates to the technical field of electrical equipment, in particular to a marine medium-voltage autotransformer distribution device.

Background

The motor is a common and extremely important device for converting electric energy into mechanical energy in an electric power system, is widely applied to industrial production from three-phase alternating current of 0.4 kV/(or alternating current single-phase 220V/alternating current three-phase 380V) to 12kV, is started and stopped relatively frequently compared with other electric appliances, and is controlled by opening and closing a contactor. In the case of large-capacity motors, the current is very high at the moment of start-up due to excitation, and more pronounced in the case of high motor start-up torque, typically 5 to 7 times or more the rated current, will give rise to a large impact on the whole network. To solve this problem, in the case of a large capacity or a high voltage level, for example, a high voltage of 3.6 to 12kV, the motor must be started by means of voltage reduction, current limiting, or the like, so as to reduce the impact on the power grid and reduce the impact damage to the transmission part of the motor at the moment of starting.

The starting mode of the autotransformer can be used in the field of medium-voltage distribution, but the implementation mode of a main circuit (3.6-12 kV voltage class) is relatively complex, and the installation space requirement for installing and connecting the autotransformer under the condition of high-capacity load is relatively large. At present, under the starting mode of an autotransformer, the autotransformer is independently arranged in a transformer cabinet, a high-voltage contactor for control is additionally manufactured into a switch cabinet to be matched with the autotransformer cabinet to form an entire system, a large amount of high-voltage cables are connected with the switch cabinet of the contactor in the autotransformer cabinet, the high-voltage cables are formed by wrapping thicker insulating layers, steel armor, shielding layers, outer jackets and the like outside copper conductors and are not easy to bend, and therefore, the problem that occupied space is large due to complex wiring of a main circuit is solved, and the peripheral cables of the autotransformer are densely distributed and are kept at a sufficient distance between different phases and opposite grounds due to insulation reasons. In addition, the connection part of the high-voltage cable and the autotransformer must use a cable terminal, the failure rate of the cable terminal is higher, the whole cable must be replaced together due to the length problem after the failure, the price of the high-voltage cable and the terminal cable is higher, and the total service life cost and maintenance workload of the whole equipment are relatively higher in total measurement and calculation.

Accordingly, there is a need to provide a marine medium voltage autotransformer power distribution device that effectively solves the above-mentioned problems.

Disclosure of Invention

The utility model provides a marine medium-voltage autotransformer power distribution device which has the advantages of simple and reliable structure, stable performance, strong environment adaptation capability, compact overall volume and lower cost.

The embodiment of the utility model provides a marine medium-voltage autotransformer power distribution device, which comprises a first switch cabinet, a second switch cabinet and at least one autotransformer cabinet, wherein the first switch cabinet and the second switch cabinet are respectively arranged adjacent to the at least one autotransformer,

the first switch cabinet is used for connecting an incoming cable and a load cable, a first contactor is arranged in the first switch cabinet, the first contactor is a medium-voltage contactor, a first end of the first contactor is connected to a power supply, and a second end of the first contactor is connected to a motor;

a second contactor is arranged in the second switch cabinet, and the second contactor is a medium-voltage contactor;

the automatic transformer cabinet is characterized in that an automatic transformer is arranged in the automatic transformer cabinet, the automatic transformer is three-phase, each of the three phases comprises a first end of the automatic transformer, a second end of the automatic transformer and a third end of the automatic transformer, the first end of the automatic transformer is a wire inlet end and is positioned at the upper part of each of the three phases of the automatic transformer, the first end of the automatic transformer is connected to the power supply, the second end of the automatic transformer is a center tap and is positioned in the middle of each of the three phases of the automatic transformer, the second end of the automatic transformer is connected to the first switch cabinet, and the third end of the automatic transformer is connected to the second switch cabinet.

Preferably, the power supply is introduced from the incoming cable, and the conductive part of the incoming cable is electrically connected with the first copper bar;

the first end of the first copper bar is electrically connected with the second copper bar, and the second end of the first copper bar is communicated with the at least one autotransformer cabinet;

the second copper bar is electrically connected with the first contactor, the first contactor is used for controlling the opening and closing of a circuit, and current flows through the third copper bar after the circuit is closed;

the third copper bar is electrically connected with the current transformer, and current flows through the fourth copper bar after flowing through the current transformer;

and a fifth copper bar is arranged on the fourth copper bar, the fifth copper bar is electrically connected with the load cable, and the load cable is electrically connected with the motor.

Preferably, after the second end of the first copper bar is communicated with the at least one autotransformer cabinet, the first copper bar is electrically connected with a seventh copper bar, and current is led to the first end of the autotransformer through the seventh copper bar;

a transformer coil winding is arranged between the first end of the autotransformer and the third end of the autotransformer, and the third end of the autotransformer is electrically connected with a ninth copper bar; the second end of the autotransformer is electrically connected with the eighth copper bar and the sixth copper bar respectively;

and after the third end of the autotransformer is electrically connected with the ninth copper bar, the tenth copper bar and the eleventh copper bar, the third end of the autotransformer is short-circuited by the twelfth copper bar and the thirteenth copper bar through closing the second contactor.

Preferably, the first contactor and/or the second contactor is a draw-out contactor or a stationary contactor.

Preferably, when the capacity of the autotransformer is small, the number of the at least one autotransformer cabinet is one; when the capacity of the autotransformer is large, the number of the at least one autotransformer cabinet is two.

Preferably, when the number of the at least one autotransformer cabinet is two, the two autotransformer cabinets are adjacently spliced, and a large bending plate is arranged between the two autotransformer cabinets and used for supporting the two autotransformer cabinets.

Preferably, the two autotransformers are a first autotransformer cabinet and a second autotransformer cabinet, the first autotransformer cabinet and the second autotransformer cabinet respectively comprise a first side plate and a second side plate, and the first side plate and the second side plate are adjacently arranged.

Preferably, the power distribution device further comprises a pressure relief channel, and the pressure relief channel sequentially penetrates through the tops of the first switch cabinet, the at least one autotransformer cabinet and the second switch cabinet.

Preferably, the incoming cable enters the bus bar chamber from the pressure release channel to be connected or enters the bus bar chamber from the cable incoming bin to be connected.

Preferably, when the motor is started, the power supply is led to the first copper bar through the incoming cable, the current flows through the seventh copper bar to the autotransformer, the second end of the autotransformer is led to the load cable through the eighth copper bar and the sixth copper bar, meanwhile, the third end of the autotransformer is connected to the second contactor through the ninth copper bar, the tenth copper bar and the eleventh copper bar, the second contactor is short-circuited through the twelfth copper bar and the thirteenth copper bar after being closed, the autotransformer is output to the motor through the load cable after being reduced to a preset value, and the motor is in a voltage-reducing current-limiting starting state;

when the motor reaches the rated rotation speed, the second contactor is opened, the first contactor is closed, current flows from the incoming cable to the first copper bar, and the current is output to the motor through the second copper bar, the first contactor, the third copper bar, the current transformer, the fourth copper bar and the load cable to enter a normal working state of the motor.

Compared with the prior art, the technical scheme of the embodiment of the utility model has the following beneficial effects:

according to the marine medium-voltage autotransformer power distribution device, the process from voltage reduction starting to normal working of the motor is well completed through switching of the first contactor and the second contactor;

furthermore, the marine medium voltage autotransformer power distribution device has the advantages of simple and reliable structure, stable performance, strong environment adaptation capability, compact overall volume, standardized production realization and lower cost, is particularly suitable for occasions with limited space on ships and severe environment and strong equipment reliability, and can also be used in occasions with high equipment reliability requirement and no complex control function requirement in a land medium voltage motor starting device, but lower cost requirement;

further, when the capacity of the autotransformer is small, the number of the at least one autotransformer cabinet is one; when the capacity of the autotransformer is large, the number of the at least one autotransformer cabinet is two; therefore, the number of the plurality of autotransformer cabinets can be arbitrarily combined and configured according to the capacity of the autotransformer;

further, when the number of the at least one autotransformer cabinet is two, the two autotransformer cabinets are adjacently spliced, a large bending plate is arranged between the two autotransformer cabinets and is used for supporting the two autotransformer cabinets, so that the overall strength of the autotransformer cabinets is ensured;

further, the power distribution device further comprises a pressure relief channel, and the pressure relief channel sequentially penetrates through the tops of the first switch cabinet, the at least one autotransformer cabinet and the second switch cabinet, so that gas generated in the power distribution device is guaranteed to be rapidly discharged out of the cabin through the pressure relief channel;

furthermore, the autotransformer, the first contactor and the second contactor can be conveniently repaired or replaced after the fault, the installation space of the autotransformer is convenient to access, and the first contactor and the second contactor can be directly extracted or detached by using a simple method.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the prior art, a brief description of the drawings is provided below, wherein it is apparent that the drawings in the following description are some, but not all, embodiments of the present utility model. Other figures may be derived from these figures without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic structural view of a front view of a marine medium voltage autotransformer power distribution device according to one embodiment of the present utility model;

fig. 2 is one of exploded schematic views of a front view of a marine medium voltage autotransformer power distribution device according to one embodiment of the present utility model;

fig. 3 is a schematic diagram showing a front view of a marine medium voltage autotransformer according to one embodiment of the present utility model;

fig. 4 is one of exploded schematic views of a rear view of a marine medium voltage autotransformer power distribution device according to one embodiment of the present utility model;

fig. 5 is a second exploded view of a rear view of a distribution device for a marine medium voltage autotransformer according to one embodiment of the present utility model;

fig. 6 is one of exploded schematic views of another rear view of a marine medium voltage autotransformer power distribution apparatus according to one embodiment of the present utility model;

fig. 7 is a second exploded view of another rear view of a marine medium voltage autotransformer power distribution device according to one embodiment of the present utility model;

fig. 8 is a schematic circuit diagram of a distribution device of a marine medium-voltage autotransformer according to an embodiment of the present utility model;

fig. 9 is a schematic diagram of an autotransformer connection of a marine medium voltage autotransformer power distribution device according to one embodiment of the present utility model;

fig. 10 is another schematic diagram of an autotransformer of a marine medium voltage autotransformer power distribution apparatus according to one embodiment of the present utility model.

Reference numerals illustrate:

1-first switchgear 2-autotransformer 3-second switchgear

4-pressure release channel 5-cable inlet bin 11-first contactor

12-first copper bar 13-second copper bar 14-third copper bar

15-current transformer 16-fourth copper bar 17-fifth copper bar

18-load cable 19-sixth copper bar 21-first autotransformer cabinet

211-first side plate 221-second side plate 22-second autotransformer cabinet

23-autotransformer 231-seventh copper bar 232-eighth copper bar

233-ninth copper bar 234-tenth copper bar 24-large bent plate

31-second contactor 32-eleventh copper bar 33-twelfth copper bar

34-thirteenth copper bar 51-incoming cable

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The technical scheme of the utility model is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.

Based on the problems existing in the prior art, the embodiment of the utility model provides a marine medium-voltage autotransformer power distribution device which has the advantages of simple and reliable structure, stable performance, strong environment adaptation capability, compact overall volume and lower cost.

Fig. 1 is a state in which each switch cabinet of a marine medium voltage autotransformer power distribution device provided by the embodiment of the present utility model is assembled, fig. 2 is a state before each switch cabinet of the marine medium voltage autotransformer power distribution device provided by the embodiment of the present utility model is not assembled, fig. 3 is a state in which a door plate, a side plate and a cable inlet bin of the marine medium voltage autotransformer power distribution device provided by the embodiment of the present utility model are removed, fig. 4 is a state in which a top cover, a pressure relief channel and a back door of the marine medium voltage autotransformer power distribution device provided by the embodiment of the present utility model are removed, fig. 5 is a state in which the top cover, the pressure relief channel, the back door and the side plates of the marine medium voltage autotransformer power distribution device provided by the embodiment of the present utility model are removed, and fig. 6 and fig. 7 are states in which the top cover, the pressure relief channel and all side plates of the marine medium voltage autotransformer power distribution device provided by the embodiment of the present utility model are removed. Referring now to fig. 1 to 7, an embodiment of the present utility model provides a marine medium voltage autotransformer power distribution apparatus, the power distribution apparatus comprising a first switch cabinet 1, a second switch cabinet 3 and at least one autotransformer cabinet 2, the first switch cabinet 1, the second switch cabinet 3 being respectively arranged adjacent to the at least one autotransformer,

the first switch cabinet 1 is used for connecting an incoming cable and a load cable, a first contactor 11 is arranged in the first switch cabinet 1, the first contactor 11 is a medium-voltage contactor, a first end of the first contactor 11 is connected to a power supply, and a second end of the first contactor 11 is connected to a motor;

a second contactor 31 is arranged in the second switch cabinet 3, and the second contactor 31 is a medium-voltage contactor;

an autotransformer 23 is arranged in the at least one autotransformer cabinet 2, the autotransformer 23 is three phases, each of the three phases comprises a first end of the autotransformer 23, a second end of the autotransformer 23 and a third end of the autotransformer 23, the first end of the autotransformer 23 is a wire inlet end and is located at the upper part of each of the three phases of the autotransformer 23, the first end of the autotransformer 23 is connected to the power supply, the second end of the autotransformer 23 is a centre tap and is located in the middle of each of the three phases of the autotransformer 23, the second end of the autotransformer 23 is connected to the first switch cabinet 1, and the third end of the autotransformer 23 is connected to the second switch cabinet 3.

Specifically, the first contactor 11 is a main control contactor, the second contactor 31 is a tail end contactor, and the first contactor 11 and the second contactor 31 are used for bearing a contactor opening and closing function in motor start control.

In some embodiments, the first contactor 11 and/or the second contactor 31 are draw-out contactors or stationary contactors.

The first, upper end of the first contactor 11 is connected to the main bus bar, i.e. the power supply end, via the contact box and the corresponding copper bar. The second, lower end of the first contactor 11 is connected to a motor, which is a medium voltage motor, by a load cable 18. The second end of the first contactor 11 is led out to a cable chamber at the rear lower part of the first switch cabinet 1 through a contact box and a corresponding copper bar, and a copper end with a corresponding hole is arranged on the copper bar of the cable chamber and is used for connecting a load cable 18 to an external motor.

Specifically, the autotransformer 23 is divided into three phases ABC, each phase has three ends, the first end, i.e. the upper end, of the autotransformer 23 is connected to the power supply through a copper bar, the second end of the autotransformer 23 is a center tap, and is used when the motor is started, and is led down to the first switch cabinet 1 to connect the incoming cable 51 and the load cable 18, and the third end, i.e. the tail end, of the autotransformer 23 is led down to the cable chamber at the lower part of the second switch cabinet 3, and is kept at an insulation distance meeting the standard requirement with the copper bar connected to the second end of the autotransformer 23, and is shorted up to the bus bar chamber after being controlled by the second contactor 31. The power enters from the cable inlet bin 5, is controlled by the first switch cabinet 1, is led out to an external motor, is reduced in voltage after being closed and short-circuited by the autotransformer 23 in the at least one autotransformer cabinet 2 and the second contactor 31 in the second switch cabinet 3, and achieves the full circuit function of reducing voltage, limiting current and starting of the medium-voltage motor.

In some embodiments, the power distribution device further comprises a pressure relief channel 4, wherein the pressure relief channel 4 penetrates through the top of the first switch cabinet 1, the at least one autotransformer cabinet 2 and the second switch cabinet 3 in sequence.

Specifically, a plurality of exhaust fans are arranged in the pressure release channel 4, and the exhaust fans are used for dissipating heat.

In some embodiments, the incoming cable 51 enters the bus bar compartment connection from the pressure relief channel 4 or enters the bus bar compartment connection from the cable incoming compartment 5. The cable entry compartment 5 can be eliminated when the incoming cable 51 enters the bus bar compartment from the pressure relief channel 4. In some embodiments, when the capacity of the autotransformer 23 is small, because the volume of the autotransformer 23 is small, the number of the at least one autotransformer cabinet 2 is one, and those skilled in the art can depend on the volume of the transformer under the current manufacturing technology conditions, which means that only one autotransformer cabinet is needed for installation and accommodation, and the details are not repeated here; when the capacity of the autotransformer 23 is large, because the volume of the autotransformer 23 is large, the number of the at least one autotransformer cabinet 2 is two, and those skilled in the art can depend on the volume of the transformer under the current manufacturing technical conditions, and here, two autotransformer cabinets must be used beyond the installation capacity of one autotransformer cabinet, which is not described herein again.

Specifically, the two autotransformer cabinets are a first autotransformer cabinet 21 and a second autotransformer cabinet 22.

In some embodiments, when the number of the at least one autotransformer cabinets 2 is two, the two autotransformer cabinets are adjacently spliced, and a large bending plate 24 is included between the two autotransformer cabinets 2, the large bending plate 24 is used for supporting the two autotransformer cabinets 2, namely, the first autotransformer cabinet 21 and the second autotransformer cabinet 22. The first autotransformer cabinet 21 and the second autotransformer cabinet 22 share a large bent plate 24, and form a complete space with the first side plate 211, the second side plate 221, the bottom plate, and the front and rear door panels for accommodating the autotransformer 23. The middle of the first side plate 211 and the second side plate 221 are hollowed out, so that a cabinet front upright post and a cabinet rear upright post part are reserved, the hollowed-out parts are used for accommodating the large bending plate 24 and keeping enough electric safety distance with the autotransformer 23 and copper bars on the ends of the autotransformer.

In some embodiments, the two autotransformers 2 are a first autotransformer cabinet 21 and a second autotransformer cabinet 22, the first autotransformer cabinet 21 and the second autotransformer cabinet 22 respectively comprise a first side plate 211 and a second side plate 221, and the first side plate 211 and the second side plate 221 are disposed adjacent to each other.

In some embodiments, the power is introduced from the incoming cable, the conductive portion of the incoming cable 51 being electrically connected to the first copper bar 12;

the first end of the first copper bar 12 is electrically connected with the second copper bar 13, and the second end of the first copper bar 12 is communicated with the at least one autotransformer cabinet 2;

the second copper bar 13 is electrically connected with the first contactor 11, the first contactor 11 is used for controlling opening and closing of a circuit, and after the circuit is closed, current flows through the third copper bar 14;

the third copper bar 14 is electrically connected with the current transformer 15, and the current flows through the fourth copper bar 16 after flowing through the current transformer 15;

the fourth copper bar 16 is provided with a fifth copper bar 17, the fifth copper bar 15 is electrically connected with the load cable 18, and the load cable 18 is electrically connected with the motor.

Specifically, the first copper bar 12 is a horizontal conductive main bus copper bar of the incoming cabinet, the second copper bar 13 is a branched copper bar at the upper end of the incoming cabinet contactor, the third copper bar 14 is a branched copper bar at the lower end of the incoming cabinet contactor, and the fifth copper bar is a copper bar of a load cable.

In some embodiments, after the second end of the first copper bar 12 is connected to the at least one autotransformer cabinet 2, the first copper bar 12 and the seventh copper bar 231 are electrically connected, and the current is led to the first end of the autotransformer 23 via the seventh copper bar 231;

a transformer coil winding is arranged between the first end of the autotransformer 23 and the third end of the autotransformer 23, and the third end of the autotransformer 23 is electrically connected with the ninth copper bar 233; the second end of the autotransformer 23 is electrically connected to the eighth copper bar 232 and the sixth copper bar 19, respectively;

after the third end of the autotransformer 23 is electrically connected to the ninth copper bar 233, the tenth copper bar 234, and the eleventh copper bar 32, the third end of the autotransformer is electrically connected to the twelfth copper bar 33 and the thirteenth copper bar 34 through the second contactor 31, so as to achieve the short circuit of the three-phase live circuit.

Specifically, the sixth copper bar 19 is a connection copper bar between the incoming line cabinet and the autotransformer cabinet, the seventh copper bar 231 is a power end copper bar of the autotransformer, the eighth copper bar 232 is a center tap copper bar of the autotransformer, the ninth copper bar 233 is a tail end copper bar of the autotransformer, the tenth copper bar 234 is a connection copper bar between the autotransformer cabinet and the tail end contactor cabinet, the eleventh copper bar 32 is a lower end copper bar of the tail end contactor, the twelfth copper bar 33 is an upper end copper bar of the tail end contactor, and the thirteenth copper bar 34 is an upper end three-phase short copper bar of the tail end contactor.

Referring now to fig. 8, in some embodiments, when the motor is started, the power source is led to the first copper bar 12 by the incoming cable 51, current flows through the seventh copper bar 233 to the autotransformer 23, the second end of the autotransformer 23 is led to the load cable 18 through the eighth copper bar 232 and the sixth copper bar 19, while the third end of the autotransformer 23 is connected to the second contactor 31 through the ninth copper bar 233, the tenth copper bar 234 and the eleventh copper bar 32, the second contactor 31 is shorted through the twelfth copper bar 33 and the thirteenth copper bar 34 after being closed, the autotransformer 23 is output to the motor through the load cable 18 after being reduced to a preset value, and enters a motor step-down current limiting start state;

when the motor reaches the rated rotation speed, the second contactor 31 is opened, the first contactor 11 is closed, and current is output from the incoming cable 51 to the first copper bar 12 to the motor through the second copper bar 13, the first contactor 11, the third copper bar 14, the current transformer 15, the fourth copper bar 16 and the load cable 18, and enters a normal working state of the motor.

Referring now to fig. 9 and 10, autotransformer 23 is electrically connected to other components via conductive copper bars.

In summary, the power distribution device for the marine medium-voltage autotransformer provided by the embodiment of the utility model well completes the process from voltage reduction starting to normal working of the motor through switching of the first contactor and the second contactor.

Furthermore, the marine autotransformer power distribution device has the advantages of simple and reliable structure, stable performance, strong environment adaptation capability, compact overall volume, realization of standardized production and lower cost, is particularly suitable for occasions with limited space on ships, harsh environment and strong equipment reliability, and can also be used in occasions with high equipment reliability requirement and no complex control function requirement in a land medium-voltage motor starting device, but lower cost requirement;

further, when the capacity of the autotransformer is small, the number of the at least one autotransformer cabinet is one; when the capacity of the autotransformer is large, the number of the at least one autotransformer cabinet is two; therefore, the number of the plurality of autotransformer cabinets can be arbitrarily combined and configured according to the capacity of the autotransformer;

further, when the number of the at least one autotransformer cabinet is two, the two autotransformer cabinets are adjacently spliced, a large bending plate is arranged between the two autotransformer cabinets and is used for supporting the two autotransformer cabinets, so that the overall strength of the autotransformer cabinets is ensured;

further, the power distribution device further comprises a pressure relief channel, and the pressure relief channel sequentially penetrates through the tops of the first switch cabinet, the at least one autotransformer cabinet and the second switch cabinet, so that gas generated in the power distribution device is guaranteed to be rapidly discharged out of the cabin through the pressure relief channel;

furthermore, the autotransformer, the first contactor and the second contactor can be conveniently repaired or replaced after the fault, the installation space of the autotransformer is convenient to access, and the first contactor and the second contactor can be directly extracted or detached by using a simple method.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The marine medium-voltage autotransformer power distribution device comprises a first switch cabinet, a second switch cabinet and at least one autotransformer cabinet, wherein the first switch cabinet and the second switch cabinet are respectively arranged adjacent to the at least one autotransformer cabinet,

the first switch cabinet is used for connecting an incoming cable and a load cable, a first contactor is arranged in the first switch cabinet, the first contactor is a medium-voltage contactor, a first end of the first contactor is connected to a power supply, and a second end of the first contactor is connected to a motor;

a second contactor is arranged in the second switch cabinet, and the second contactor is a medium-voltage contactor;

the automatic transformer cabinet is characterized in that an automatic transformer is arranged in the automatic transformer cabinet, the automatic transformer is three-phase, each of the three phases comprises a first end of the automatic transformer, a second end of the automatic transformer and a third end of the automatic transformer, the first end of the automatic transformer is a wire inlet end and is positioned at the upper part of each of the three phases of the automatic transformer, the first end of the automatic transformer is connected to the power supply, the second end of the automatic transformer is a center tap and is positioned in the middle of each of the three phases of the automatic transformer, the second end of the automatic transformer is connected to the first switch cabinet, and the third end of the automatic transformer is connected to the second switch cabinet.

2. The marine medium voltage autotransformer power distribution apparatus as claimed in claim 1, wherein,

the power supply is led in from the incoming cable, and the conductive part of the incoming cable is electrically connected with the first copper bar;

the first end of the first copper bar is electrically connected with the second copper bar, and the second end of the first copper bar is communicated with the at least one autotransformer cabinet;

the second copper bar is electrically connected with the first contactor, the first contactor is used for controlling the opening and closing of a circuit, and current flows through the third copper bar after the circuit is closed;

the third copper bar is electrically connected with the current transformer, and current flows through the fourth copper bar after flowing through the current transformer;

and a fifth copper bar is arranged on the fourth copper bar, the fifth copper bar is electrically connected with the load cable, and the load cable is electrically connected with the motor.

3. The marine medium voltage autotransformer power distribution apparatus as claimed in claim 2, wherein,

after the second end of the first copper bar is communicated with the at least one autotransformer cabinet, the first copper bar is electrically connected with a seventh copper bar, and current is led to the first end of the autotransformer through the seventh copper bar;

a transformer coil winding is arranged between the first end of the autotransformer and the third end of the autotransformer, and the third end of the autotransformer is electrically connected with a ninth copper bar; the second end of the autotransformer is electrically connected with the eighth copper bar and the sixth copper bar respectively;

and after the third end of the autotransformer is electrically connected with the ninth copper bar, the tenth copper bar and the eleventh copper bar, the third end of the autotransformer is short-circuited by the twelfth copper bar and the thirteenth copper bar through closing the second contactor.

4. The marine medium voltage autotransformer power distribution device of claim 1, wherein the first contactor and/or the second contactor is a draw-out contactor or a stationary contactor.

5. The marine medium voltage autotransformer power distribution apparatus as claimed in claim 4, wherein,

when the capacity of the autotransformer is small, the number of the at least one autotransformer cabinet is one;

when the capacity of the autotransformer is large, the number of the at least one autotransformer cabinet is two.

6. The marine medium voltage autotransformer power distribution device of claim 5, wherein when the number of said at least one autotransformer cabinet is two, two autotransformer cabinets are adjacently spliced and include a large bent plate between said two autotransformer cabinets for supporting said two autotransformer cabinets.

7. The marine medium voltage autotransformer power distribution device of claim 6, wherein the two autotransformers are a first autotransformer cabinet and a second autotransformer cabinet, the first autotransformer cabinet and the second autotransformer cabinet each including a first side plate and a second side plate, the first side plate and the second side plate being disposed adjacent to each other.

8. The marine medium voltage autotransformer power distribution device of claim 1, further comprising a pressure relief channel extending sequentially through the tops of the first switch cabinet, the at least one autotransformer cabinet, and the second switch cabinet.

9. The marine medium voltage autotransformer power distribution device of claim 8, wherein said incoming cable enters a bus bar compartment connection from said pressure relief channel or enters a bus bar compartment connection from a cable incoming compartment.

10. A marine medium voltage autotransformer power distribution apparatus as claimed in claim 3, wherein,

when the motor is started, the power supply is led to the first copper bar through the incoming cable, the current flows through the seventh copper bar to the autotransformer, the second end of the autotransformer is led to the load cable through the eighth copper bar and the sixth copper bar, meanwhile, the third end of the autotransformer is connected to the second contactor through the ninth copper bar, the tenth copper bar and the eleventh copper bar, the second contactor is short-circuited through the twelfth copper bar and the thirteenth copper bar after being closed, the autotransformer is output to the motor through the load cable after being reduced to a preset value, and the motor is in a reduced-voltage current-limiting starting state;

when the motor reaches the rated rotation speed, the second contactor is opened, the first contactor is closed, current flows from the incoming cable to the first copper bar, and the current is output to the motor through the second copper bar, the first contactor, the third copper bar, the current transformer, the fourth copper bar and the load cable to enter a normal working state of the motor.

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