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ABILKEEN LVQB(T)-35-220 Oil-immersed Inverted Type Accuracy Class.jpg
ABILKEEN LVQB(T)-35-220 Oil-immersed Inverted Type Accuracy Class.2.jpg
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ABILKEEN LVQB(T)-35-220 Oil-immersed Inverted Type Accuracy Class

LVQB (T) -35/66/110/220 current transformer is a SF6 gas insulated independent inverted structure current transformer independently developed by our factory based on reference to similar products at home and abroad. This product has advantages that oil immersed transformers cannot have: using high electrical strength SF6 gas as the insulation medium, good insulation performance, long service life, short production cycle, simplified process, oil-free, maintenance free, safer and more reliable operation, which can meet the high reliability requirements of modern power grids for transmission and transformation equipment

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    Product Details

    Product Overview

    The product adopts an inverted structure, consisting of a shell, explosion-proof plate, body, sleeve, base, density relay and other components. The product is equipped with a shielding component to improve the electric field inside, and the secondary lead is connected to a closed junction box. There are two types of shells: three-way shell and bell shaped shell. The main insulation adopts a coaxial cylindrical uniform electric field structure. The primary guide rod and the secondary shield form a coaxial cylindrical uniform electric field with each other. To change the current ratio, a series parallel connection can be used, or a series parallel connection can be used, with all ratios obtained from the secondary tap. Explosion proof plates have been installed on the upper part of the shell. The internal insulation of SF6 gas insulated transformers has high reliability, and it is generally impossible to generate internal insulation fault arcs. However, considering the possibility of internal arcs caused by unforeseeable unexpected factors, explosion-proof plates are specially installed as a security measure for the equipment. External insulation sleeve: For products with 220kV and below, high-strength ceramic sleeves or high-temperature vulcanized silicone rubber composite hollow insulation sleeves are used, which can withstand a rated pressure of 1.6MPa (failure pressure>4.0MPa).

    Technical Parameters

    (1) Altitude: Not exceeding 2000m (Products exceeding 2000m shall be designed separately)
    (2) Ambient temperature: Maximum +50℃/Minimum -40℃, and the daily average temperature does not exceed 30℃
    (3) Maximum monthly average relative humidity: 90%
    (4) 10-minute average maximum wind speed: 35m/s
    (5) Maximum ice thickness: 10mm
    (6) Pollution levels: Level III, Level IV
    2. Maximum voltage of the equipment: 40.5/72.5/126/252kV
    3. Rated frequency: 50Hz
    4. Rated primary current: 300 - 4000A
    5. Rated secondary current: 1A or 5A
    6. Secondary combination: Any combination of accuracy levels such as 0.2, 0.2S, 0.5, 0.5S, 5P, TPY, TPFS
    7. Accuracy level: 0.2 level, 0.2S level, 0.5 level, 0.5S level, 5P level: 20 - 60VA; TPY level: 10 - 20Ω
    8. Error limit value: 0.2S level: 20 - 40
    9. Instrument security factor: ≤5
    10. Error limit conditions for TPY level:
    a. Primary time constant Tp = 100ms or 60ms
    b. Short-circuit DC component 100% (i.e., full offset)
    c. Rated working cycle: C - 0.1s - 0 - 0.5S (or 0.4S) - C - 0.1s - 0 (The standard error time is 0.4s)
    d. Multiple of rated short-circuit current: 10, 15, 20
    11. Rated insulation level: 35kV current transformer: 40.5/95/185kV
    66kV current transformer: 72.5/140/325kV
    110kV current transformer: 126/200/480kV
    220kV current transformer: 252/395/950kV
    12. Short-time thermal current: 50 - 63kA, 3S
    13. Rated short-time withstand current: 125 - 160kA (peak value)
    14. Rated voltage withstand level for zero voltage: 1.3 times the maximum working voltage of the equipment
    15. Partial discharge level: ≤5pC under 1.2 times the maximum working voltage of the equipment
    16. Annual air leakage rate: ≤0.5%
    17. Moisture content in SF6 gas: ≤150×10^-6 (V/V)
    18. Radio interference level: Under 1.1 times the maximum working voltage of the equipment, the radio interference voltage ≤500μV
    19. Insulation creepage ratio: 25mm/kV (for 31mm/kV in severe pollution areas)
    20. Static load capacity of primary terminals: 2000N - 6000N
    21. Maximum total mass of the product: 35kV current transformer: 450kg (including 4kg of SF6 gas)
    66kV current transformer: 500kg (including 5kg of SF6 gas)
    110kV current transformer: 600kg (including 7kg of SF6 gas)
    220kV current transformer: 1400kg (including 23kg of SF6 gas)

    Product Parameters

    Model Rated Primary Current (A) Rated Secondary Current (A) Number of Secondary Winding Groups Measuring Class (Accuracy Class/Composite Error Factor FS) Rated Output (VA) at Measuring Class (Full Scale) Number of Protection Winding Groups Protection Class (Accuracy Limit Factor ALF) Rated Output (VA) at Protection Class (Full Scale) Rated Short-Time Thermal Current (kA) Rated Dynamic Current (kA) Rated Withstand Voltage of Winding (kV) Mechanical Strength Withstand Voltage (kV) Total Weight (kg)
    LRGBJ-220 2×300 5 or (or) 1 Two groups, 0.5/0.2S or (or) 0.5S/0.2 or (or) 0.2S ≤5 or (or) ≤10 50(30) Four groups, 5P or (or) 10P 10/30 50 125 ≤85 4000 60S 640
    2×600 63 160
    2×750
    2×2000
    LRGBJ-110 2×50 5 or (or) 1 Two groups, 0.5/0.2S or (or) 0.5S/0.2 or (or) 0.2S ≤5 or (or) ≤10 50(30) Four groups, 5P or (or) 10P 10/30 50(30) 12.5 31.5 31.5 80 ≤85 2000 60S 240
    2×75 15.8 40 40 100
    2×100 21 54 54 125
    2×200 31.5 80 80 200
    2×300 31.5 80 80 200
    2×600 50 125 125 315
    2×1500 50 125 125 315
    LRGBJ-66 2×50 5 or (or) 1 Two groups, 0.5/0.2S or (or) 0.5S/0.2 or (or) 0.2S ≤5 or (or) ≤10 50(30) Three groups, 5P or (or) 10P 10/30 50(30) 12.5 31.5 31.5 80 ≤85 2000 60S 200
    2×75 15.8 40 40 100
    2×100 21 54 54 125
    2×200 31.5 80 80 200
    2×300 31.5 80 80 200
    2×600 50 125 125 315
    2×1500 50 125 125 315
    LRGBJ-35 5 - 2×50 5 or (or) 1 Two groups, 0.5/0.2S or (or) 0.5S/0.2 or (or) 0.2S ≤5 or (or) ≤10 40(20) Two groups, 5P or (or) 10P 10/30 40(20) 50 100 125 250 ≤85 2000 60S 90
    15、250 110 250 250 500
    2×300 110 250 250 500
    600、1250 31.5 80 80 200
    2×750 - 1500 40 100 100 200
    50 125 125 315