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Siemens, TWSM 8856, 2008, 600MVA, 50 Hz, 432,000V / 23,500V, ODWF Cooling

Siemens, TWSM 8856, 2008, 600MVA, 50 Hz, 432,000V / 23,500V, ODWF Cooling

Description

  1. Overview
    1. Siemens 600 MVA generator transformer
    2. Model: TWSM 8856
    3. Year: 2008
    4. Type of cooling: ODWF
    5. Rated power: 600 MVA
    6. Service: Continuous
    7. Rated frequency: 50 Hz
    8. Standard: IEC
    9. Total weight with oil: 385 tonnes; insulating oil 74 tonnes
    10. Done very little work
    11. It is a transformer from a closed 500 MW coal fired power generation plant
  2. Voltage And Current Ratings
    1. Rated voltage ratio: 432,000 V +10/-15% in +10/-15 steps // 23,500 V
    2. Winding: HV, position 1, voltage: 475,200 V, current: 729 A
    3. Winding: HV, position 11, voltage: 432,000 V, current: 802 A
    4. Winding: HV, position 26, voltage: 367,200 V, current: 943 A
    5. Winding: LV, voltage: 23,500 V, current: 14,741 A
    6. Vector group: YN d1
  3. Impedance Voltage At 75 Degrees Celsius
    1. Power MVA: 600, pair of windings: HV/LV, position 1, impedance voltage %: 17.3
    2. Power MVA: 600, pair of windings: HV/LV, position 11, impedance voltage %: 16.5
    3. Power MVA: 600, pair of windings: HV/LV, position 26, impedance voltage %: 15.8
  4. Short-Circuit And Neutral Loading
    1. Maximum permissible short-circuit duration: 3 s
    2. Neutral loading capacity: HV-neutral is brought out fully insulated and grounded
  5. Insulation Levels
    1. Winding: HV, highest system voltage Um: 420 kV r.m.s., low frequency applied test voltage: 50 kV r.m.s., induced test voltage ACSD: 630 kV r.m.s., induced test voltage ACLD: 412/364 kV r.m.s., switching impulse withstand voltage SI: 1050 kV peak, lightning impulse withstand voltage LI FW/CW: 1,425/1,568 kV peak
    2. Winding: HV-N, highest system voltage Um: 24 kV r.m.s., low frequency applied test voltage: 50 kV r.m.s., lightning impulse withstand voltage LI FW/CW: 126 kV peak
    3. Winding: LV, highest system voltage Um: 24 kV r.m.s., low frequency applied test voltage: 50 kV r.m.s., lightning impulse withstand voltage LI FW/CW: 150/165 kV peak
  6. Losses
    1. No-load losses: 1.00 x Un 170,000 W
    2. Load losses at 75 degrees Celsius: power 600 MVA, pair of windings HV/LV, position 1, load losses: 1,270,000 W
    3. Load losses at 75 degrees Celsius: power 600 MVA, pair of windings HV/LV, position 11, load losses: 1,310,000 W
    4. Load losses at 75 degrees Celsius: power 600 MVA, pair of windings HV/LV, position 26, load losses: 1,550,000 W
    5. Total losses at 600 MVA: 1,480,000 W
  7. Sound And Tap Changer
    1. Sound pressure level Lpa: 70 dB + 0 dB tolerance without cooler at 0.3 m distance
    2. Adjustment of transformer ratio under load by operation of on-load tap charger for voltage regulation: HV-side
    3. On-load tap charger: Reinhausen, type VRF III 1000 Y – 123/D - 14261WS, position range +10/-15%, number of steps +10/-15, number of positions 26, rated current 1,000 A