Combined transformer for wind power generation

Product structure characteristics

ZGS11-ZF-1600/40.5 combined transformer provides users with 35kV grid-connected voltage. The product box is divided into high-voltage room, transformer room and low-voltage room according to function, and the three compartments are arranged in the shape of a Chinese character "品" or "目".

The base of the product is a welded structure, and the enclosure, partition, door and top cover above the base are assembled by local welding and bolts. The box shell is made of cold-rolled sheet material, and the outer surface is painted or sprayed to ensure that the product is suitable for outdoor climate conditions.

The transformer heat sink of the combined transformer is exposed outdoors and cooled by natural ventilation; a dehumidification device can also be configured inside the box according to the external environment to minimize condensation on internal components.

The sealing parts of the box should have reliable sealing performance, and the top cover should not accumulate water or leak.

In order to meet the use requirements, each independent compartment in the box must be equipped with sufficient lighting facilities, and can be automatically linked with the opening and closing of the door to ensure that good lighting conditions can be provided at any time to facilitate maintenance and inspection by users. The overall design fully considers the user experience and the safety of the equipment to ensure its reliable operation in various environments.

SHELL

1.Material of ZGS11-ZF-1600/40.5 combined transformer housing: The top cover is made of cold-rolled steel plate. The metal material of the housing has been treated with anti-corrosion, and the surface covering layer has strong adhesion and is uniform and consistent, ensuring that it will not be corroded within the specified time. The outside four sides (except the door) cannot be opened or disassembled. There are signs indicating their functions and warning signs on the doors of each functional room.

2.The casing has sufficient mechanical strength and will not be deformed or damaged during lifting, transportation and installation.

CABINET

1.The box frame is welded; the high and low voltage rooms and transformer room are arranged in the shape of "目" or "品". The box has sufficient mechanical strength and rigidity, and will not be deformed or damaged during lifting, transportation and installation; the appearance and color of the box are beautiful and coordinated with the environment.

2.All doors on the cabinet open outwards, with an opening angle of not less than 90°, and are equipped with positioning devices. The door locks are rainproof, anti-blocking and anti-rust concealed locks, and all unit doors meet rainproof requirements.

HIGH VOLTAGE DISTRIBUTION ROOM

1.The high-voltage power distribution device uses load switches, plug-in fuses, and elbow-type cable plugs, which can cut off and close the load current at 200A, and must not exceed its rated value. The no-load tap changer must be regulated when the power is off.

2.The high-voltage busbar and connecting wires should be marked with different phases. The joints should be fixed with supporting insulators, the general parts should be fixed with wire clamps, and the three-phase wires should be fixed separately.

3.It can monitor the top oil temperature and oil level of the transformer.

GROUNDING

1.The grounding system of the combined transformer shall comply with the provisions of GB 11022-1999.

2.The box of the combined transformer should be equipped with a special grounding conductor, which is equipped with fixed connection terminals connected to the grounding grid, with no less than 2 terminals and obvious grounding marks. The grounding terminal is a copper bolt with a diameter of no less than 12mm.

If copper conductor is used, the rated short circuit duration should not exceed 200A/mm2 when it is 1S; when the rated short circuit duration is 3S, it should not exceed 125A/mm2, but its cross section should not be less than 30mm

The metal frame of the combined transformer, the high-voltage distribution device, the low-voltage distribution device and the metal support of the transformer room all have grounding terminals that meet the technical requirements and are reliably connected to the dedicated grounding conductor.

The three chambers of the combined transformer are interconnected through a dedicated grounding conductor, otherwise they should be reliably connected together through dedicated terminals. All non-live metal exposed parts of high and low voltage equipment are reliably grounded, and the doors and the withdrawable parts under normal operating conditions are guaranteed to be reliably grounded when opened or isolated.

Usage Environment

●Ambient air temperature: upper limit +40℃, lower limit -25℃;

●Altitude: no more than 4000m;

●Wind pressure: no more than 700Pa;

●Humidity: daily average value is not more than 95%, monthly average value is not more than 90%;

●Air pollution level: Level IV

●Earthquake intensity: 8 degrees

●No conductive dust, no violent vibration and explosion hazard, no corrosive and flammable gas location

Implementation Standards

Main technical parameters