XHXC105 Transformer Demagnetizer| Automatic Core Degaussing Instrument
Residual magnetism left in transformer and instrument transformer cores after DC resistance tests and ratio measurements can cause relay misoperation, inrush current damage and metering errors when the equipment is re-energized. The XHXC105 demagnetizer applies the patented DC variable-frequency attenuation principle: current amplitude and polarity change periodically while the hysteresis loop gradually shrinks, cancelling the residual flux. Suitable for 35kV and above power transformers and instrument transformers — especially large-capacity units at 330kV and above — it brings laboratory-grade demagnetization to traction substations and depots in a 5kg portable instrument.
Applications & Target Audience: Engineered for railway and metro traction power supply departments, transit substation maintenance teams and power depots that test traction transformers, station service transformers and instrument transformers, and need fast, portable demagnetization before transformers return to service.
Key Specifications
| Parameter | Specification |
|---|
| Demagnetizing Current | 5A / 1A / 200mA / 5mA (customizable) |
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| Demagnetizing Mode | Manual / Automatic |
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| Demagnetizing Time | Manual: approx. 3 min per cycle
Automatic: approx. 9 min per full cycle |
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| Demagnetizing Effect | Greater than 90% per cycle |
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| Progress Display | 0 ~ 100% real-time on LCD |
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| Working Power Supply | AC 220V±10% |
|---|
| Power Frequency | 50Hz±1Hz |
|---|
| Ambient Temperature | -25°C ~ +50°C |
|---|
| Ambient Humidity | ≤90% RH |
|---|
| Weight | 5kg (excluding test leads) |
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| Display | Large LCD with clear operation menu |
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Advanced Features
- Patented DC variable-frequency attenuation principle for effective core demagnetization
- Three-phase transformers only need B-phase demagnetization (terminals B and 0)
- Automatic mode runs the 5A-1A-200mA-5mA sequence without operator intervention
- Manual mode with selectable current levels for flexible field use
- Automatic current stabilization judgment with 16-bit AD data acquisition
- Fast demagnetization: a manual cycle takes about 3 minutes instead of the former 30-minute process
- Demagnetization effectiveness above 90% per cycle (previously about 80%)
- Directly reuses the current test leads of DC resistance testers for convenient matching
- Two-key operation: red key for selection/reset, green key for confirm/start
- Compact 5kg design that is easy to carry to field sites
- Automatic discharge when the process reaches 100%, with reset key for emergency stop
- Built-in 8A fuse protection and safety grounding terminal for reliable operation
Operation in Three Steps
| Step | Operation |
|---|
| Step 1 — Connect | Connect the ground terminal to earth, then connect the demagnetizing output leads to the transformer bushing. For a single-phase transformer connect A and X; for a three-phase transformer connect B and 0 only — B-phase demagnetization is sufficient. Output polarity does not matter. |
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| Step 2 — Select mode | Power on and press the red reset key to choose Automatic or Manual mode, then press the green start key to confirm. In manual mode select the current level (5A / 1A / 200mA / 5mA). |
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| Step 3 — Run and discharge | In automatic mode the instrument runs the 5A-1A-200mA-5mA sequence and displays 0-100% progress; when 100% is reached it discharges automatically and returns to the main menu. |
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Because the XHXC105 can directly reuse the current test leads of a DC resistance tester, traction maintenance teams can complete DC resistance measurement and demagnetization with one setup, minimizing track possession time.
FAQ
Q1: Who is the XHXC105 intended for?
It is intended for railway and metro traction power supply departments, transit substation maintenance teams and power depots that test traction transformers, station transformers and instrument transformers and must remove residual magnetism before re-energization.
Q2: How is it connected to three-phase and single-phase transformers?
For a three-phase transformer, connect the two output leads to terminals B and 0 only — demagnetizing the B phase is sufficient for the whole core. For a single-phase transformer, connect A and X. The output has no polarity requirement, and if the most magnetized phase is unknown, two or three passes (AB, BC, CA) can be performed.
Q3: Does it also demagnetize instrument transformers (CT/PT)?
Yes. The XHXC105 is designed for power transformers as well as instrument transformers, and is recommended for 35kV and above equipment, especially large-capacity units at 330kV and above, before they are put into service.
Q4: Can it work in field conditions at depots and substations?
It operates at ambient temperatures from -25°C to +50°C with humidity up to 90% RH, on AC 220V±10%, 50Hz±1Hz. When powered by a site generator, ensure the output is a 50Hz sine wave with a grounded phase or use an isolation transformer to avoid blowing the input fuse.
Q5: What warranty and technical support are provided?
Each unit comes with a 12-month free warranty for quality problems and lifetime maintenance and technical service, plus remote troubleshooting guidance to help transit teams restore equipment quickly.
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