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