XHXC105 Transformer Demagnetizer
Product Description
The XHXC105 Transformer Demagnetizer is a specialized instrument designed to eliminate residual magnetism in large power transformers and instrument transformers after DC resistance testing. Residual magnetism, caused by the inherent hysteresis of ferromagnetic materials during voltage ratio and DC resistance measurements, can lead to transformer half-cycle saturation upon energization, generating substantial harmonic currents that may trigger protective relay misoperation and cause economic losses.
Built on superior DC attenuation frequency conversion technology, the XHXC105 features both automatic and manual demagnetization modes. The automatic mode intelligently sequences through 5A, 1A, 200mA, and 5mA current levels, completing the full demagnetization cycle in under 4 minutes—a dramatic improvement from the traditional 30-minute process. For three-phase transformers, demagnetizing only the B-phase achieves complete residual magnetism elimination across all phases.
The instrument employs a 16-bit AD data acquisition system with automatic current stabilization, a large backlit LCD display with real-time progress indication, and intuitive two-button operation (red for select/reset, green for confirm/start). Its compact, lightweight design (5kg) makes it ideal for field deployment in substations and transformer manufacturing facilities. The XHXC105 is compatible with existing DC resistance test current leads, enabling seamless integration into standard testing workflows.
Why Demagnetization Matters
Residual magnetism in transformer cores poses eight critical risks to power system reliability:
- Protective relay misoperation causing repeated transformer commissioning failures
- Voltage surges during fault clearing triggering widespread protection trips
- Sympathetic inrush currents propagating between adjacent substations, leading to cascading blackouts
- Electro-dynamic stress damaging transformer windings and circuit breakers
- Switching overvoltage damaging connected electrical equipment
- DC component saturation of current transformers degrading measurement accuracy
- Harmonic pollution compromising power grid quality
- Voltage instability affecting normal operation of adjacent equipment
Key Features
- Patented DC attenuation frequency conversion technology for precise demagnetization control
- Single B-phase demagnetization sufficient for complete three-phase transformer demagnetization
- Dual-mode operation: automatic (intelligent multi-current sequencing) and manual (selectable current levels)
- 16-bit AD high-precision data acquisition with automatic current stabilization
- Rapid demagnetization: single cycle reduced from 30 minutes to under 4 minutes
- Superior efficiency: single-pass demagnetization rate improved from 80% to over 90%
- Direct compatibility with existing DC resistance test current leads for streamlined workflows
- Chinese/English backlit LCD interface with real-time demagnetization progress display
- Suitable for 35kV and above power transformers and instrument transformers, especially 330kV+ high-capacity units
- Compact and lightweight at 5kg, optimized for field and on-site deployment
Technical Specifications
| Demagnetization Current | 5A, 1A, 200mA, 5mA (Customizable) |
| Demagnetization Mode | Manual / Automatic |
| Demagnetization Time | Manual ≤3min/cycle, Automatic ≤9min/cycle |
| Demagnetization Efficiency | ≥90% per cycle (Single-pass) |
| Demagnetization Progress | 0~100% Real-time Display |
| Working Power Supply | AC 220V±10% |
| Power Frequency | 50Hz±1Hz |
| Operating Temperature | -25℃~50℃ |
| Operating Humidity | ≤90% |
| Weight | 5kg (without test cables) |
| Display | Backlit LCD (Chinese/English) |
| Application | 35kV+ Power & Instrument Transformers |
| Technology | DC Attenuation Frequency Conversion (Patented) |
| Standard Accessories | Main Unit, Power Cable, 2x Test Cables, Ground Cable, 5x Spare Fuses (8A) |
Frequently Asked Questions
Q1: Why is transformer demagnetization necessary before commissioning?
After DC resistance testing and voltage ratio measurements, residual magnetism remains in the transformer core due to ferromagnetic hysteresis. When the transformer is energized, this residual flux causes half-cycle saturation, generating high-magnitude harmonic inrush currents. These can trigger protective relay misoperation, cause sympathetic tripping in adjacent substations, damage windings through electro-dynamic stress, degrade power quality, and in severe cases lead to cascading blackouts. Demagnetization before commissioning ensures safe, reliable transformer energization.
Q2: How does the XHXC105 DC attenuation frequency conversion technology work?
The XHXC105 employs a patented three-principle approach: (1) DC demagnetization with periodically reversing current polarity, (2) progressively decreasing current amplitude through 5A → 1A → 200mA → 5mA stages, and (3) gradually shrinking magnetic hysteresis loops through alternating magnetic pole cancellation. This systematic attenuation process achieves over 90% residual magnetism elimination in a single cycle, compared to 80% with conventional single-current approaches.
Q3: Can the XHXC105 handle both single-phase and three-phase transformers?
Yes. For single-phase transformers, connect the demagnetization output to terminals A and X. For three-phase transformers, connect only to the B-phase terminal and neutral (0)—the instrument's patented technology propagates the demagnetization effect across all three phases from a single B-phase connection. If residual magnetism distribution is uncertain, sequential demagnetization of AB, BC, and CA phases is also supported. The output terminals are non-polarized for simplified connection.
Q4: What are the differences between automatic and manual modes?
In automatic mode, the instrument performs an initial measurement to assess residual magnetism levels, then intelligently sequences through 5A, 1A, 200mA, and 5mA current stages until 100% progress is achieved, automatically discharging upon completion (≤9 minutes total). In manual mode, operators select a specific current level (5A, 1A, 200mA, or 5mA) via the red button and initiate demagnetization with the green button—ideal for targeted demagnetization or when only partial treatment is required (≤3 minutes per selected level).
Q5: What are the MOQ, warranty, and after-sales support terms?
The minimum order quantity is 1 unit, with payment via T/T or L/C. Each instrument includes a 12-month comprehensive warranty covering manufacturing defects, with lifetime technical support and repair services. Standard delivery is 5-10 working days in an aluminum alloy carrying case. Custom current ranges and OEM configurations are available upon request. For volume pricing, technical consultation, or service inquiries, please contact our sales team.
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