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CN214753206U - Single-side pre-magnetizing device for bidirectional transformer of ship power grid - Google Patents

Single-side pre-magnetizing device for bidirectional transformer of ship power grid Download PDF

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Publication number
CN214753206U
CN214753206U CN202120874059.9U CN202120874059U CN214753206U CN 214753206 U CN214753206 U CN 214753206U CN 202120874059 U CN202120874059 U CN 202120874059U CN 214753206 U CN214753206 U CN 214753206U
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China
Prior art keywords
transformer
winding
voltage
contactor
main
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Active
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CN202120874059.9U
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Chinese (zh)
Inventor
方向飞
李国荣
曹大友
卢永勇
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China Merchants Jinling Shipping Nanjing Co Ltd
China Merchants Marine Equipment Research Institute Co ltd
China Merchants Jinling Shipyard Jiangsu Co Ltd
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China Merchants Jinling Shipping Nanjing Co Ltd
China Merchants Marine Equipment Research Institute Co ltd
China Merchants Jinling Shipyard Jiangsu Co Ltd
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Application filed by China Merchants Jinling Shipping Nanjing Co Ltd, China Merchants Marine Equipment Research Institute Co ltd, China Merchants Jinling Shipyard Jiangsu Co Ltd filed Critical China Merchants Jinling Shipping Nanjing Co Ltd
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Abstract

The utility model relates to a ship power grid bidirectional transformer unilateral pre-magnetizing device, which comprises a main loop and an excitation loop; the main loop comprises a main transformer arranged between the high-voltage bus and the low-voltage bus; the excitation loop comprises an excitation transformer; the excitation transformer is a three-winding transformer and comprises a high-voltage winding, a first secondary winding and a second secondary winding; the high-voltage winding is connected with a high-voltage bus through a first contactor, the first secondary winding is connected with a low-voltage bus through a second contactor, and the second secondary winding is connected with a high-voltage winding of the main transformer through a third contactor. The utility model discloses a problem of the unilateral pre-magnetization of two-way work electric wire netting transformer has been solved to the device, no matter the transformer is forward work or reverse work, the device all only carries out the pre-magnetization to the iron core of one side winding of transformer for the pre-magnetization return circuit design of transformer becomes more succinct, and chain control, the control between pre-magnetization and the main switch becomes simpler.

Description

Single-side pre-magnetizing device for bidirectional transformer of ship power grid
Technical Field
The utility model relates to a unilateral pre-magnetization device of boats and ships electric wire netting bidirectional transformer.
Background
The transformer is widely applied to a ship power distribution system, and is divided into a power grid transformer for boosting or reducing voltage, an isolation transformer for isolating and the like according to the application. Due to the limitation of the capacity of a ship power station and the large impact current of the no-load switch-on of a large-capacity transformer, the main switch of the transformer is easy to be disconnected when the no-load switch-on is carried out. In a ship power grid, pre-magnetization before switching on a transformer switch is considered generally if the capacity of the transformer reaches 1000KVA or more. The pre-magnetizing of a unidirectional working transformer is common in the design of ships, while the pre-magnetizing technology of a large-capacity bidirectional working transformer is less. And for the pre-magnetization of the bidirectional working transformer, the design concept of bidirectional working bidirectional pre-magnetization is traditionally that the primary side of the transformer is pre-magnetized when the transformer works in the forward direction, and the secondary side of the transformer is pre-magnetized when the transformer works in the reverse direction, and the method is basically consistent with the design concept of the pre-magnetization of the unidirectional working transformer.
The method comprises the following steps that firstly, for coil wiring of the transformer, the primary coil and the secondary coil of a primary coil of the transformer need to be led out, and single-side pre-magnetizing only needs to be carried out on the primary side or the secondary side; secondly, for the traditional bidirectional pre-magnetizing, more power lines, control lines and interlocking lines are needed to be arranged between the primary side and the secondary side of the transformer for judging whether the transformation works in the forward direction or the reverse direction, and the single-side pre-magnetizing is carried out. This is also an advantage brought by the unilateral pre-magnetization of the bidirectional working transformer.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a unilateral pre-magnetization device of boats and ships electric wire netting bidirectional transformer to solve the unilateral problem of pre-magnetization of two-way work electric wire netting transformer, no matter the transformer is forward work or reverse work, the device all only carries out pre-magnetization to the iron core of one side winding of transformer, makes the pre-magnetization return circuit design of transformer become more succinct, and chain control, the control between pre-magnetization and the main switch becomes simpler.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a ship power grid bidirectional transformer single-side pre-magnetizing device comprises a main loop and an excitation loop; the main loop comprises a main transformer arranged between the high-voltage bus and the low-voltage bus;
the excitation loop comprises an excitation transformer; the excitation transformer is a three-winding transformer and comprises a high-voltage winding, a first secondary winding and a second secondary winding; the high-voltage winding is connected with a high-voltage bus through a first contactor, the first secondary winding is connected with a low-voltage bus through a second contactor, and the second secondary winding is connected with a main transformer high-voltage winding through a third contactor;
the high-voltage winding, the second secondary winding and the high-voltage bus of the three-winding transformer have the same voltage grade; the first secondary winding and the low-voltage bus have the same voltage level.
Furthermore, a circuit breaker is arranged between the contactor and the bus.
Furthermore, ACB circuit breakers are arranged among the high-voltage winding, the low-voltage winding side and the bus of the main transformer.
Furthermore, an MCCB breaker is arranged among the first contactor, the second contactor and the bus.
Furthermore, the main loop is connected by adopting 3 x 95 cable wires.
Further, the excitation circuit is connected by adopting 3 x 10 cables.
Furthermore, the capacity of the main transformer is more than or equal to 1000 KVA.
The utility model discloses successfully solved the problem of two-way work transformer pre-magnetization, reduced the impact current of transformer main switch when the unloaded combined floodgate of vary voltage and caused the problem that the main switch breaks off the mouth. And the traditional two-way pre-magnetizing is changed into the single-side pre-magnetizing, so that the design of a transformer magnetizing loop is facilitated, the problem that the working direction of a two-way working transformer can be judged according to a pre-magnetizing power supply is solved, the magnetizing loop and a switch control loop keep the correct action direction, the switch misoperation is avoided, and the linkage of the two ends of the transformer is more conveniently realized.
Drawings
Fig. 1 is a single-line diagram of the unilateral pre-magnetizing principle of the bidirectional working transformer.
Detailed Description
As shown in fig. 1, the pre-magnetizing device for the bidirectional transformer of the ship power grid comprises a main loop and an excitation loop; the main loop comprises a main transformer 1 arranged between an MSB 690V bus and an MSB 400V bus; the excitation loop comprises an excitation transformer 2; the excitation transformer is a three-winding transformer and comprises a high-voltage winding, a first secondary winding and a second secondary winding; the high-voltage winding is connected with a high-voltage bus through a first contactor KM1, the first secondary winding is connected with a low-voltage bus through a second contactor KM2, and the second secondary winding is connected with the high-voltage winding of the main transformer through a third contactor KM 3;
the high-voltage winding of the three-winding transformer, the second secondary winding and the 690V bus have the same voltage grade; the first secondary winding is of the same voltage level as the 400V bus.
In this embodiment, ACB breakers are disposed between the high-voltage winding, the low-voltage winding side, and the bus of the main transformer.
MCCB breakers are arranged among the first contactor KM1, the second contactor KM2 and the bus.
In this embodiment, the main transformer has a capacity of 3750KVA, the main circuit is connected by a 3 × 95 cable, and the excitation circuit is connected by a 3 × 10 cable.
When the main transformer 1 works in the forward direction, the KM1 and the KM3 are closed to pre-charge magnetism; when the main transformer 2 works reversely, the KM2 and KM3 are closed to perform pre-charging.

Claims (7)

1. A ship power grid bidirectional transformer single-side pre-magnetizing device is characterized by comprising a main loop and an excitation loop; the main loop comprises a main transformer arranged between the high-voltage bus and the low-voltage bus;
the excitation loop comprises an excitation transformer; the excitation transformer is a three-winding transformer and comprises a high-voltage winding, a first secondary winding and a second secondary winding; the high-voltage winding is connected with a high-voltage bus through a first contactor, the first secondary winding is connected with a low-voltage bus through a second contactor, and the second secondary winding is connected with a main transformer high-voltage winding through a third contactor;
the high-voltage winding, the second secondary winding and the high-voltage bus of the three-winding transformer have the same voltage grade; the first secondary winding and the low-voltage bus have the same voltage level.
2. The apparatus of claim 1, wherein a circuit breaker is disposed between the contactor and the bus bar.
3. The apparatus of claim 1, wherein an ACB breaker is provided between the high voltage winding, the low voltage winding side and the bus of the main transformer.
4. The apparatus of claim 1, wherein an MCCB breaker is disposed between the first contactor, the second contactor, and the bus.
5. The apparatus of claim 1, wherein the primary loop is connected using 3 x 95 cable.
6. The apparatus of claim 1, wherein the excitation circuit is wired using 3 x 10 cables.
7. The apparatus of claim 1, wherein said main transformer has a capacity greater than or equal to 1000 KVA.
CN202120874059.9U 2021-04-26 2021-04-26 Single-side pre-magnetizing device for bidirectional transformer of ship power grid Active CN214753206U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120874059.9U CN214753206U (en) 2021-04-26 2021-04-26 Single-side pre-magnetizing device for bidirectional transformer of ship power grid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120874059.9U CN214753206U (en) 2021-04-26 2021-04-26 Single-side pre-magnetizing device for bidirectional transformer of ship power grid

Publications (1)

Publication Number Publication Date
CN214753206U true CN214753206U (en) 2021-11-16

Family

ID=78613700

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202120874059.9U Active CN214753206U (en) 2021-04-26 2021-04-26 Single-side pre-magnetizing device for bidirectional transformer of ship power grid

Country Status (1)

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CN (1) CN214753206U (en)

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