DC Demagnetizing Unit with Automatic Current Stabilization

Name: DC Demagnetizing Unit with Automatic Current Stabilization
Brand: Xi'an Xu&Hui Electromechanical Technology Co., Ltd.

XHXC110: Advanced Demagnetizer for Power Transformers & Current Transformers Engineered to address residual magnetism risks in large power transformers and CTs after DC resistance testing, the XHXC110 is the ultimate solution for protecting critical equipment from inrush current impacts and ensuring seamless, safe commissioning. Ferromagnetic hysteresis leaves residual magnetism in transformer cores after turns ratio, DC resistance, or similar tests. When energized, this

Brand Name XZH TEST

Payment Terms T/T

Place of Origin Xi'an Shaanxi China

Delivery Time 5-8 work days

Minimum Order Quantity 1set

Packaging Details wooden packaging

arithmetic logic unit laser pointer with green light uav with camera

Product Description

XHXC110: Advanced Demagnetizer for Power Transformers & Current Transformers

Engineered to address residual magnetism risks in large power transformers and CTs after DC resistance testing, the XHXC110 is the ultimate solution for protecting critical equipment from inrush current impacts and ensuring seamless, safe commissioning.

Ferromagnetic hysteresis leaves residual magnetism in transformer cores after turns ratio, DC resistance, or similar tests. When energized, this residual magnetism causes half-core saturation, spawning harmful harmonics in excitation current. The result? Increased reactive power waste, relay protector malfunctions, and costly operational disruptions. Proactive demagnetization with the XHXC110 before commissioning is non-negotiable for reliable transformer operation.

The XHXC110 elevates our proven demagnetizer series with game-changing upgrades: automatic demagnetization mode (eliminating tedious manual repetition), a larger LCD display for comprehensive data insights, and simplified two-button operation (red = select/reset, green = confirm/start). Most impressively, demagnetization time is slashed from 30 minutes to under 4 minutes—dramatically boosting efficiency.

Performance Characteristics:

Utilizes patented technology – DC frequency conversion attenuation principle;

Three-phase transformers achieve demagnetization by demagnetizing only phase B;

Features automatic current stabilization judgment and 16-bit AD data acquisition and processing;

Offers manual/automatic demagnetization modes;

Fast demagnetization speed – reduced from 30 minutes to no more than 4 minutes per cycle;

Significant demagnetization effect – increased from 80% to over 90% per cycle;

especially suitable for large-capacity transformers with voltage levels of 330kV and above;

This product is small in size and lightweight, making it ideal for field use.

Why Residual Magnetism Is a Critical Threat

Relay protection misfires cause repeated transformer commissioning failures, delaying project timelines;
Voltage surges from short-circuit clearance trigger protection errors, cutting power to all transformer loads;
Inrush current from an unloaded Substation A transformer triggers "sympathetic inrush" in Substations B/C, leading to cascading outages and massive downtime;
Inrush current’s excessive electric power damages transformers and circuit breakers, increasing maintenance costs;
Switching overvoltage from residual magnetism destroys valuable electrical equipment;
DC components in inrush current over-magnetize CTs, ruining measurement accuracy and compromising relay protection;
Harmonics in inrush current degrade grid power quality, violating industry standards;
Grid voltage instability (spikes/drops) disrupts connected equipment, causing further operational issues.