This paper discusses the basic structure of three kinds of wide band DRFM,analyzes an important index-encoded noise,and makes a comarison of advantages and shortcomings among three structures according to the spurious level of output signal frequency spectrum.

Corrosion reasons of stray current during metal anode electrolyzers running;

Research on distribution rule of the stray current in the pits;

Design of reducing corrosion to electrolysis system by reduction in stray current;

The impacts of the stray capacitance on output signal are analyzed and simulated with the simulation software of circuit.

The performance of a resistor voltage transformer could be affected by the resistors and stray capacitance.

The results show that the step response time includes two parts,stray capacitance term and stray inductance term.

But the circuit stray inductance has serious influence upon the turn-off characteristic of IGCTs.

In large production converters,due to the stray inductance,the switching transient spike is usually beyond the voltage allowed by the device,which can destroy the converter.

The circuit stray inductance has serious influence upon the switching characteristic of the thyristor.

Tows the power supply system in view of the URT transportation to use the rails backflow to have the stray currents question,unifies the DC 1500V power supply service pattern power supply to be away from long,the voltage drop small merit,proposed uses the DC 1500V fourth rail technologies to come the question which the thorough settlement stray currents produces.

This article analyzes the reasons why the stray currents occur and their harm to subway equipment and facilities and proposes preventing and controlling measures for the subway stray currents.