Product Introduction
MOEORW-W4202AT is an integrated dual-function tester for power transformer fault detection, combining frequency response analysis (FRA) and low-voltage short-circuit impedance method. It adopts high-speed digital frequency sweep and 16-bit high-precision sampling technology, which can sensitively identify winding deformation, displacement, turn-to-turn short circuit and inter-phase insulation defects. The device supports automatic data comparison, intelligent diagnosis and standardized report generation, fully complying with DL/T911-2016 and DL/T1093-2008 standards. It is mainly used for 63kV–500kV power transformers in factory inspection, handover acceptance, post-fault analysis and periodic condition assessment.
Product Parameter (specification)
| Frequency response measuring range | 10Hz–10MHz (linear), 0.5kHz–1MHz (segmental) |
| Amplitude measuring range | -120dB to +20dB, precision: 0.1dB |
| Frequency accuracy | 0.005% |
| Input impedance | 1MΩ; Output impedance: 50Ω |
| Impedance measuring range | 0–100%, voltage: 25V–500V (0.2 class), current: 0.1A–10A (0.2 class) |
| Operating temperature | -10℃ to +40℃ |
| Dimensions | 370×300×170mm |
| Weight | 20kg |
| Communication | USB / WIFI |
Product Feature
- Dual detection methods in one device, covering frequency response and short-circuit impedance test
- High-speed DDS frequency sweep technology, clear waveform recognition for tap position changes
- Automatic three-phase transverse contrast and historical longitudinal contrast diagnosis
- Fast test speed, complete full-transformer detection in a short time
- Built-in anti-interference design, stable for substation site
- Automatically generate formal Word test reports with curves and analysis
- No need to disassemble transformer cover, simple and safe wiring
- Compatible with multiple computer systems, easy to operate
Product Application
- Factory delivery test and type test of large power transformers
- Handover acceptance and periodic preventive test of substation transformers
- Winding state evaluation after short-circuit shock
- Condition detection before and after transformer transportation and overhaul
- Safety assessment for 63kV–500kV Yn / Y / △ connected transformers
- Technical support for transformer maintenance and life evaluation
Company Qualifications
FAQ
Q1: What preparations are needed before formal test?
A: Cut off power, fully discharge all terminals, disconnect external leads, clean contacts, confirm reliable core grounding, and preheat the instrument for more than 15 minutes.
Q2: Can the instrument work outdoors in rainy days?
A: No, it has no waterproof function. Please use it indoors or under a rainproof shed.
Q3: How to judge whether the instrument is working normally?
A: For frequency response mode, short yellow and green clamps; a straight 0dB line indicates normal. For impedance mode, open circuit voltage shows about 220V and current is zero.
Q4: What if the test waveform is distorted?
A: Use UPS independent power supply to avoid on site equipment interference; keep good grounding and keep away from metal suspended objects.
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