Method of current drying of traction asynchronous electric motors of DC electric train

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to methods for drying the insulation of traction asynchronous electric motors of DC electric trains. For current drying of the insulation of a traction electric motor at the train's parking lot, its standard on-board equipment is used. Through the raised pantograph, voltage from the catenary is supplied to the traction converter. The microprocessor control system, through the power module of the traction converter, supplies regulated direct current to the stator windings of at least one group of parallel-connected traction asynchronous electric motors. The drying process is carried out in two stages: initially, a current of 142±3 A is supplied for 40 minutes, which then drops to 56±4 A. Protection against leakage currents is provided by standard input and output current sensors. The process is controlled by the operator without the involvement of additional personnel and equipment.EFFECT: increase in the reliability of the traction drive by preventing insulation breakdowns caused by its moisture in the autumn-winter period, as well as eliminating the need to use stationary drying equipment and dismantle the engines.2 cl, 1 dwg

Description

[0001] The invention relates to railway transport, in particular to systems for servicing and repairing electric rolling stock, and is intended for drying the insulation of traction asynchronous electric motors (TED) in order to protect against electrical breakdown associated with its reduction during the operation of electric trains in the fall, winter and spring due to the moistening of the stator windings of the traction asynchronous electric motor.

[0002] A method is known for drying the insulation of traction asynchronous electric motors (TEM) of electric trains of the EPE series ES104 type, which consists of increasing the resistance of the moistened insulation of the TEM with a flow of hot air from a heating unit (Preservation and de-preservation of an electric train. Special instruction document No.: ES 104.0.00.000.000 IS1, pp. 8a-8d).

[0003] The disadvantage of the known drying method is the need for additional personnel and equipment (a heater or heat gun, a megohmmeter, a diffuser, clamps, and bends), lack of mobility, and the impossibility of drying while the train is parked. The socket connector of the traction asynchronous electric motor must be disconnected. Also, to implement this drying method, the electric train must be parked at a depot.

[0004] Also known is a three-cycle method for drying wet insulation of electrical machines (RU Patent No. 2815728, IPC H02K 15 / 12, published 03 / 21 / 2024), which consists of increasing the resistance of wet insulation of TEM by cyclically and gradually increasing the flow of hot air from the fan and cyclically and gradually increasing the air temperature from the heating unit.

[0005] The disadvantages of this method include the need for additional personnel (for constant monitoring and mode switching) and equipment (electric heater, fan, humidity sensors), as well as the lack of mobility. The electric motor must be dismantled and disconnected from the power supply. The socket connector of the traction asynchronous electric motor must be disconnected. Also, to implement this drying method, the electric train must be parked at a depot.

[0006] The technical result, which the invention is aimed at achieving, is an increase in the operational reliability of the traction asynchronous drive and the efficiency of servicing the traction electric motor due to the possibility of carrying out current drying of the insulation by the electric train itself without dismantling the filter cloths of the motors, without installing components for drying and additional equipment.

[0007] Drying of the traction electric motor insulation is carried out at the electric train parking lot using standard on-board equipment: current collector (PC), traction converter (TC), microprocessor control and diagnostic system, current sensors (CS).

[0008] When the pantograph is raised, voltage from the overhead contact system is supplied via the traction converter to the stator windings of a group of parallel-connected traction motors. The drying process consists of two stages: applying a direct current of 142±3 A for 40 minutes, reducing the current to 56±4 A, and then continuing to apply it until the process is terminated, i.e., the operator switches off the mode. The current is regulated by the TP power module, and leakage current protection is provided by standard input and output current sensors. The process is controlled by the operator via a microprocessor control system.

[0009] The advantages of this solution are: a reduction in the number of insulation breakdowns, elimination of "floating" of engines during start-up, maintaining the temperature of the traction electric motor frame up to +50°C during parking, no need to dismantle the equipment, saving time and resources.

[0010] The essence of the claimed invention is explained by a drawing, where the drawing is a structural diagram of the implementation of the method (traction converter, engine, control system).

[0011] Due to the fact that the graphic image of the figure of the claimed invention is difficult to read when the long sides of the sheet are arranged vertically, it was advisable to arrange the sheet horizontally, which made it possible to significantly enlarge the drawing.

[0012] The method is implemented using standard electrical equipment of the electric train. The functional circuit of the current drying includes: a current collector (1) for removing voltage from the contact network, a traction converter (2) for converting and regulating the magnitude of direct current supplied to the stator windings of the traction electric motor, a group of parallel-connected traction electric motors (3.1-3.4) - which is a load in the drying circuit, a microprocessor control system - programmed to implement a given drying algorithm (current supply in two stages, time control), current sensors (CS) - to provide protection against leakage currents in the drying circuit (4.1, 4.2).

Claims

1. A method for current drying of the insulation of traction asynchronous electric motors of a direct current electric train, characterized in that the drying is carried out without dismantling the motors using standard on-board equipment, for which purpose the current collector is connected to the contact network, voltage is supplied through a traction converter to the stator windings of at least one group of parallel-connected traction electric motors, regulating the magnitude of the direct current by the power module of the converter, wherein the drying algorithm is programmed into a microprocessor system and is controlled by it using input and output current sensors, and the drying algorithm includes two stages: supplying a direct current of 142±3 A for 40 minutes, reducing the current to 56±4 A and supplying it until the forced end of the process.

2. The method of current drying according to paragraph 1, characterized in that the activation of the specified mode is carried out from the operator’s control panel via a microprocessor control system.

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