Potential measurement under stray current interference

In some places with stray current, multiple measurements are required. They change over time, and they change with each other. Multiple recorders are best suited for this situation. Because the torque of the mechanism is too small to overcome the friction of the pen on the paper.

The recording points shall be recorded by an amplification recorder or a potentiometer recorder. In the amplifier recorder, as in the amplified voltmeter, the measured signal is converted into an external current independent of the load and sent to the measuring mechanism, which includes a torque motor and a preamplifier.

The amplifier produces an increased torque to achieve a response time of 0.5 seconds, which gives the stylus the necessary operating pressure. The discharge point of stray current is usually located at the place with the maximum grounding potential. When the discharge of the stray current is cut off, the over positive potential of the stray current is rapidly established, which is not free.

At a distance, the over negative potential of stray current inflow will be measured, which is not IR free. Only when the stray current does not work, it is possible to measure the tube to ground potential without IR drop in the stray current region. In order to avoid the corrected potential of protection potential, the tube ground potential should be set to a larger negative value than that without stray current, which is safer.

According to the record, the position of the pipe to ground potential without IR drop can be determined when the stray current source is not working. If the actual measured potential of these points is greater than the protection potential, it can be considered that there is sufficient cathodic protection. In order to estimate the grounding potential of cathodic protection pipeline without IR drop during the operation of stray current generator, the real polarization state can be obtained by using polarization test probe.

Shandong Linyi Bosi conductive materials Co., Ltd. is a high-tech enterprise specializing in the production of MMO flexible anode, conductive polymer flexible anode and titanium coated anode, mainly providing cathodic protection technology, engineering design, installation and technical services.

Tel: +86 17568010262，0539-3712117.