| 摘要 |
A high powered current generator for electromagnetic inspection of hydrocarbon pipelines from an AC stabilized with rectangular waveform and whose measurements and interpretation are used for evaluating the condition of the lining of the pipelines of five main modules: self-programmable regulated voltage power source module; power source reference decoupling module; H Bridge inverter module; feedback module, and control and processing module. The generator was specifically designed as part of the instrumentation of (TI EMS); which supplies an electric current in the pipeline to produce electromagnetic radiation along the hydrocarbon pipeline. This energy is detected by antennas for obtaining the location of the pipeline and the electric current flowing therein. The generator produces an alternating current at a frequency that can be set within the range of 0.1 Hz to 1 KHz. However, to simplify the job of the operating personnel, default values of 0.1, 0.2, 0.05, 1, 2, 4, 8, 98, 512 and 625 Hertz were established. The current value can also be programmed within the range of 0.1A to 4.5A. In order to facilitate the work of the operators, a set of fixed current values 0.100, 0.250, 0.500, 1.0, 1.5, 2.0 , 2.5, 3, 3.5, 4.0 and 4.5 Amperes was established. |
| 主权项 |
1. A high powered current generator for electromagnetic inspection of hydrocarbon pipelines, wherein an AC stabilized rectangular waveform is used for evaluating the condition of the lining of the pipeline, the generator comprising a self-programmable regulated voltage power source module, to set a value of a regulated voltage from about 10 to 130 VDC, based on an electrical impedance of a pipeline; a power source reference decoupling module, which isolates a ground supply voltage from VAC with respect to an output voltage of the generator; an H Bridge inverter module, which allows alternating current to the generator output at a frequency of about 0.1 Hz to 1 KHz; a feedback module that adjusts the signals of the source voltage of the programmable voltage and the current output signal of the H-bridge inverter used as feedback for the control and obtaining of the regulating current output of the generator;
and a control and processing module including a firmware software executable on a microcontroller. |
