The principle of online detection technology is: under the condition of normal operation of power equipment, after measuring the conventional insulation characteristic parameters (current through the equipment insulation, capacitance, dielectric loss factor Tan δ), so as to reflect the status of equipment operation and whether there is a problem. The dielectric loss factor Tan δ is the key parameter affecting high voltage electrical equipment, equipment operation problems tanδ can be reflected in time, high sensitivity, simple online operation control.

The principle of online detection of TAN δ has two key: one is through the hardware phase Angle direct measurement, the key is the zero-crossing phase contrast method, voltage contrast method; One is to obtain tanδ value by digital processing of the measured signal after a/ D transformation by software. The key is harmonic analysis.

Principle of zero-crossing phase contrast method: To get the current signal and voltage signal I had zero plastic u, let it become a zero to flip the square wave with u, I use a "or" gate contrast the I and u had zero time difference square wave width t (t = 90 °, the delta), square wave with high frequency clock pulse width t read, according to the clock pulse number n and periodic delta t, t = n delta t use formula, The width of T can be calculated, and then calculated according to the voltage and current signal frequency.

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