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>400kV Range

LQTT 750kV(2x375kV)/375kVA AC Series Test Transformer | PD <3pC | IEC-Compliant HV Testing System

IEC 60270-certified HV testing system with <3pC partial discharge sensitivity


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Product Details

Product Tags

Technical Specifications (Standardized)

Model：LQTT 2×375kV/ 375kVA
Type：Cylindrical, modular single-phase
Frequency：50Hz
Dimensions：Height 6.4m | Weight 12,000kg

ParameterValueStandard
Rated Capacity375kVAIEC 60076-11
Input Voltage3kV
Output Voltage750kV (2×375kV series)
Rated CurrentInput: 2×62.5A, Output: 0.5A
Impedance Voltage≤13%IEEE C57.12.90
Voltage Unbalance≤±5% (between units)
Overload Capacity130% current for 120sIEC 60076-11
Overvoltage Withstand110% U<sub>H</sub> (825kV) for 60s
Partial Discharge (PD)<5pC @ 100% U<sub>H</sub>
<3pC @ 80% U<sub>H</sub>		IEC 60270
Noise Level≤60 dB(A) @ 4mISO 3746
Thermal LimitsWinding ΔT≤65K, Oil ΔT≤55KIEC 60076-7

Core Technology Highlights

1. Advanced Insulation System

  • Metal-Oxide Arresters (3kV MOA) between LV windings (IEC 60099-4)

2. Oil Dielectric Performance

  • Breakdown voltage: >65kV/2.5mm (ASTM D877)

  • Moisture content: <10ppm

  • Dissipation factor: ≤0.25% @ 25°C (ASTM D924)

  • Solidification point: ≤-40°C

3. Operational Reliability

Load ConditionDurationThermal Limit
100% rated60 minWinding ≤65K, Oil ≤55K
80% ratedContinuousWinding ≤65K, Oil ≤55K

Modular Components

▶ Upper Stage (HCTT-187.5kVA/375kV)

  • PD Level: <5pC @ 375kV | <3pC @ 300kV

  • Waveform Distortion: ≤5%

  • Dielectric Loss: ≤0.4%

▶ Lower Stage (HCTT-375kVA/375kV)

  • Transfer Capacity: 187.5kVA @ 3kV

  • Overvoltage Withstand: 110% for 60s

  • Oil Test: BDV >65kV/2.5mm (IEC 60156)



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