3 tons steel shell melting furnace rectifier transformer detailed description

The rectifier transformer is used to reduce the primary high voltage to the input voltage suitable for the intermediate frequency power supply. A dedicated high-impedance oil-immersed self-cooling rectifier transformer is used, and its model is ZS series.

1 , technical parameters

1) Type: 1 set of ZS series

2) Rated capacity: ≥ 2500 kVA

3) Phase number: 6 phase 12 veins

4) Rated frequency 50HZ

5) Rated voltage: 35 kV on the high voltage side

Low pressure side (1) 1000V

Low pressure side (2) 1000V

6) Voltage regulation mode: no load magnetic pressure regulation 5 files

7) Tap range: 10KV ± 2 × 2.5%

8) Connection group: Dd0y11

9) Short circuit impedance: 6%

10) Insulation level: LI75AC35/AC5

skills requirement

1) Cooling method: using oil immersion and self-cooling.

2) Pressure regulation mode: no load voltage regulation

3) Transformer temperature rise: coil (resistance method) 65 °C

Top oil layer (thermometer method) 55 °C

Fuel tank and machine component surface 80 °C

4) Shield between the high and low voltage windings, and reliably ground through the clamp tank housing.

Insulation Level 5) A transformer insulation material is level.

6) Short-circuit impedance, no-load loss, and load loss are values based on the rated capacity of the fundamental wave.

7) A magnetic isolation plate or a magnetic strip is installed between the low-pressure porcelain sleeve and the box.

8) The transformer low voltage is connected by copper bars.

9) The rectifier transformer is in the form of a chip radiator.

10) The transformer is equipped with an oil sample valve, and there is an oil discharge device at the bottom of the transformer tank.

11) The transformer sealing ring is made of acrylate rubber to ensure that the transformer oil does not leak when the transformer is working at the highest temperature and lowest temperature.

12) The transformer core is made of WISCO high-quality cold-rolled silicon steel sheet, which adopts a 45 °C full oblique joint glass ribbon without hole lashing structure. The coil is made of high quality oxygen-free copper magnet wire. Can withstand short circuits and unexpected temperature rises, noise and vibration loads IEC551 .

13) The transformer uses vacuum oil to completely remove moisture from the insulating material.

14) The surface of the fuel tank is phosphating and electrostatic spraying after spraying.

15) Overload capability: 125% , 2 hours; 200% , 10 seconds. Long-term operation under no load at 110% rated voltage. At 105% of rated voltage, it can be operated for a long time at rated current.

16) Noise level: noise ≤ 60dB

17) Others according to standards.

annex

1) With alarm contact thermometer (signals are passive contacts).

2) Pressure relief device.

3) High-voltage, low-voltage side insulation sleeve.

4) Oil valve (oil filter connection valve; oil drain valve; oil sample valve, etc.).

5) Gas relays (respectively for heavy gas and light gas contact signals, all of which are passive contacts),

6) Dehumidifying respirator

7) Ground terminal.

8) Hanging.

9) Nameplate (with wiring diagram).

10) Exhaust valve (on the gas relay).

11) Use 25# transformer oil.

12) With oil pillow.

13) Transformer marking, lifting, installation, transportation and storage shall be carried out in accordance with GB / T6451 - 1995 .

14) The color of the transformer housing is (silver gray).

15) The signage of the transformer equipment number.

16) Others (performed by national standard).