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Products overview
The HMYDQW-150 kVA/280 kV Insulated Cylindrical Partial Discharge-Free Test Transformer System is designed for power frequency voltage testing of electrical equipment, particularly in applications with strict requirements for partial discharge levels. The system meets the power frequency withstand voltage and partial discharge testing requirements for electrical equipment of various voltage levels and capacities.
technical Parameters
- Rated Capacity 150 kVA
- Input Voltage 0.4 kV (400 V)
- Input Current 375 A
- High-Voltage Output 0–280 kV
- High-Voltage Current 0.53 A
- Waveform Distortion ≤3%
- Measuring winding voltage ratio 1000:1
- Power frequency withstand voltage of low-voltage input terminals to ground 5 kV/1 min
- Dielectric loss <0.3%
- Noise ≤60 dB
- Partial discharge level 0–250 kV: ≤1–3 PC
- 0–280 kV: ≤3–5 PC
- Permissible Operating Time At rated voltage and rated current: 30 min continuous (starting from ambient temperature)
- At two-thirds of rated voltage and rated current: Continuous operation
- Impedance 3%–12%
- Complies with Standard JB/T9641-1999 "Test Transformers"
FAQs
Q: What are the different configurations of this equipment, and how should I select the appropriate model?
A: There are four types: single-phase iron-cased, iron-cased cascade, insulated-tube, and insulated-tube cascade. For applications with high partial discharge requirements, choose the insulated-tube or insulated-tube cascade type; for standard applications with lower requirements, the iron-cased type is suitable.
Q: What are the parameters and accuracy of the voltage divider?
A: Rated voltage: 250 kV; voltage division ratio: 1000:1; measurement accuracy: Class 1.5; dielectric loss: <0.5%; capacitance deviation: ±1.5%; built-in temperature compensation.
Q: Does the isolation transformer provide filtering?
A:Yes, with attenuation >40 dB in the 40 kHz–100 kHz range and >60 dB in the 100 kHz–1 MHz range. This effectively suppresses interference and ensures accurate partial discharge testing.
Products Details
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