Monitoring of carrying cable in the well by electric drive of winch at the logging works

Emergency situations during logging operations are considered. The necessity of monitoring of the carrying cable in the well was shown, especially at the jet perforation and seismic researches of wells. The way of monitoring of logging cable and geophysical probe by means of the electric drive of tripping works of the logging winch is offered. This method allows timely to identify the wedges of geophysical equipment and the tension of the cable in well without interfering into construction of logging installation by means of algorithmic processing of sensors of electric drive. Research was conducted on the simulation model; these results indirectly confirm the possibility of using of electric drive for monitoring of downhole equipment

Steady operation of the electric drive of pipeline armature in the emergency situation at low ambient temperatures

This scientific work is devoted to the study of the electric drive operation of pipeline armature at low ambient temperatures. Hit of moisture into reducer and rare inclusions in operation of locking regulator are led to curdling lubricant that causes the increased wear of mechanical knots. There is a probability of freezing mechanical components; it leads to emergency situations. The problem of improving working efficiency of the electric drive of shut-off regulating armature at low ambient temperatures of the environment is solved in this work. A simulation model of the GUSAR electric drive was developed to solve this problem. Studies of the simulation model show the need to limit the torque increase rate on a drive motor shaft. The algorithm of setting of PI speed controller to obtain acceptable transient processes is suggested. Recommendations for the use of the algorithm in the microprocessor control system of electric drive are proposed. It is shown that the electric drive operation algorithm with torque increasing limitation on the motor shaft will be smoothly working off the perturbing actions that occur in pipeline armature

Modeling of switched-reluctance drive in emergency operation

The authors have considered in MatLab Simulink the simulation model of one- and two-section switched reluctance drive operating in hazardous industrial mechanisms. The model allows investigating the work of switched-reluctance drive in usual, emergency and low-phases modes. The paper introduces a free-failure control algorithm which gives the possibility to provide the operation recovery of switched-reluctance drive based on continuous monitoring of phase currents and stirring up the operation recovery algorithm. The data of transient simulation at one motor phase loss in one- and two-section switched reluctance motors are given. The time charts are compared in rotation frequency of one- and two-section motor drives. The dependences of speed failure on drive structure switching time and load level are introduced. The paper introduces the adequacy of the proposed mathematical model which allows investigating the switched-reluctance drive

Mathematical model of induction motor in phase failure mode

The paper considers the formation process of mathematical model of induction motor in electric drives of hazardous production facilities in phase failure emergency mode considering direct and reverse sequence fields that allows considering the impact of the elliptic field in phase failure emergency modes. The switching process into emergency two-phase operation was made using motor failure matrix. The paper introduces the results of transient modeling at loss of motor stator phase. The timing charts of speed and current obtained experimentally were compared using an automated test bench and a simulation model in the Matlab Simulink. Adequacy of the proposed mathematical model which allows investigating the induction motor in emergency two-phase operation of three-phase motor is proved

Monitoring of carrying cable in the well by electric drive of winch at the logging works

Emergency situations during logging operations are considered. The necessity of monitoring of the carrying cable in the well was shown, especially at the jet perforation and seismic researches of wells. The way of monitoring of logging cable and geophysical probe by means of the electric drive of tripping works of the logging winch is offered. This method allows timely to identify the wedges of geophysical equipment and the tension of the cable in well without interfering into construction of logging installation by means of algorithmic processing of sensors of electric drive. Research was conducted on the simulation model; these results indirectly confirm the possibility of using of electric drive for monitoring of downhole equipment

Fault-tolerance of induction drives

Однокопылов Иван Георгиевич, канд. техн. наук, доцент кафедры «Электропривод и электрооборудование», Томский политехнический университет, г. Томск; [email protected]. Дементьев Юрий Николаевич, Ph.D., канд. техн. наук, доцент, заведующий кафедрой «Электропривод и электрооборудование», Томский политехнический университет, г. Томск; [email protected]. I.G. Odnokopylov, Tomsk Polytechnic University, Tomsk, Russian Federation, [email protected], Yu.N. Dementiev, Tomsk Polytechnic University, Tomsk, Russian Federation, [email protected]Представлен краткий обзор известных методов обеспечения живучести. На основе анализа скрытых резервов системы привода предложен и обоснован новый принцип построения электропривода со свойством живучести, представлены необходимые требования, предъявляемые к двигателю и преобразователю, разработаны алгоритмы управления асинхронным линейным приводом в аварийном режиме, предложены технические решения по реализации. Для проверки представленных алгоритмов управления, обеспечивающих живучесть, разработана специальная математическая модель линейного и вращающегося асинхронного электропривода и представлены результаты моделирования в нормальном и некоторых аварийных режимах работы, подтверждающие работоспособность предложенных принципов. В заключении проанализированы характеристики привода и показана возможность восстановления работоспособности в аварийном режиме работы. Кроме того, представлены рекомендации по проектированию асинхронных двигателей с обеспечением свойства живучести, а также определены направления для дальнейших исследований. The short review of known methods of realizing the fault-tolerant function is presented. A new drive control principle of implementing fault-tolerant function is proposed on the basis of analysis of available resources of the drive system. Novel control algorithms of induction drive are developed, and engineering solutions for the implementation are suggested. To verify the presented control algorithms including the fault-tolerant function a special mathematical model of induction drive is developed. This model can be applied to induction motors of linear and rotary type. In the paper presents simulation results of the normal and some emergency modes that confirm efficiency of the proposed principles. In conclusion the analysis of the drive characteristics is carried out and the possibility of recovery in the emergency operating mode is shown. In addition the authors present the guidelines for design of induction drives with fault-tolerant concept as well as the areas of further research