RU144858U1 - ELECTRIC TRUCK ENGINE DIAGNOSTIC DEVICE - Google Patents

Abstract

1. Diagnostic device for a traction engine of an electric locomotive by determining the most heated point, containing temperature sensors installed on the engine to measure selected operating parameters and connected to a computing unit, which is a software-computer complex, characterized in that fiber-optic temperature sensors are introduced into the device engine operating parameters, an optical laser source of an optical signal, an analyzer of the characteristics of the optical signal producing the necessary Measurement and transmitted them to the software and computer system; while the software and computer complex consists of a computer with software connected to the sensors. 2. A diagnostic device for a traction engine of an electric locomotive according to claim 1, characterized in that the operating parameters include the temperature characteristics of the engine.

Description

The utility model relates to electrical engineering, in particular to temperature control systems of direct current traction electric motors (TED) of electric locomotives and diesel locomotives during operation (monitoring).

Overload protection of rotating electrical machines is designed to provide a means of preventing significant overheating of the windings of an electrical machine. Based on the fact that the main type of damage is a breakdown of insulation (up to 40%), the temperature factor mainly determines the TED resource. Exceeding the temperature by 10 ° C (for insulation class B) reduces the insulation resource by half. Thus, to predict the life of a TED, it is very important to have objective information about the temperature of a TED.

Typically, such protection systems use built-in winding temperature sensors. Most often, industrial motors use resistive temperature sensors built into the stator windings to directly record the temperature of the stator winding. More sophisticated equipment is described in Thermal Tracking-a Rational Approach to Motor Protection, IEEE Transactions on Power Apparatus and Systems, Vol. PAS-93 (Sept.-Oct. 1974), pp. 1335-1344. " The article describes an analog relay with a design based on knowledge of the thermal circuit of a rotating machine and containing feedback from the built-in temperature sensor. The thermal model that is used to predict the temperature of a rotating rotor is known. This model uses the known stator temperature and stator current. The system predicts the engine temperature and provides a trip signal if the limit conditions are exceeded.

A device is known for automatically controlling the temperature of the windings of an electric DC machine (RF No. 2177669), containing a mathematical model of an electric machine as a thermal object, and the signals from the sensors of the current and voltage of the electric machine and the shaft speed are fed to the inputs of a block containing a mathematical model electric machine, fan shaft speed, coolant temperature, as well as the effect of correcting the process of calculating the maximum local temperature ture of the armature winding, winding main and additional poles. The device calculates the maximum local temperature of the anchor winding, the windings of the main and auxiliary poles.

The disadvantages of this device are the complexity of the device, which consists in the fact that for its functioning it is necessary to know the voltage drop on the windings of the main and additional poles of the electric machine. In a traction motor, this is a big problem due to the inability to place cables in the engine space. A problem is also the measurement of the rotation speed of the motor shaft. In addition, this device calculates the temperature of the anchor winding, the windings of the main and additional poles, which may not correspond to the local temperatures of the most heated areas, and, accordingly, to overheating. It is necessary to have a thermal calculation model of TED to monitor the thermal state of the engine during load changes during operation and to predict the state of insulation at the most heated points.

A known thermal protection system containing an electronic modeling device (RU 21211209), the magnitude of the output signal of which automatically changes the air supply of the motor - fans in the cooling system of traction electric motors of electric locomotives. The basis of his work is an analogy between the dynamic processes of heating and cooling of the armature windings of electric machines and the processes of charge and discharge of a capacitor in an R-C circuit.

The disadvantage of the system containing this device is that due to its openness (if we consider it as an automatic temperature control system, the input of the control and regulation device of which the output signal of the electronic model is fed, rather than the measured temperature value of the windings of the traction motors), the system has greater static unevenness and increased energy costs for operation.

Closest to the claimed utility model is a device for monitoring the thermal state of the traction motor during operation by determining the most heated point of the traction motor with a channel for the cooling medium and with a fan with a controlled drive (RF patent No. 79840, IPC B60L 11/02, H02H 7/06 , op. 20.01.2009) containing a temperature sensor for the cooling medium installed at the inlet of the channel for the cooling medium, a computing unit containing a mathematical model of the engine as a thermal object, to the input of which converted signals from a temperature sensor installed at the inlet of the channel for the cooling medium, characterized in that temperature sensors installed at the outlet of the cooling medium and on the housing under the main pole of the electric motor are connected to the input of the conversion unit, the output of which is connected to the input of the computing unit containing a mathematical model, and the output of the specified computing unit is connected to the control system of the traction engine, the input of which according to the program of the computing unit p the calculated values of the maximum local temperatures of the warmest points of the internal space of the engine are reached.

The disadvantages of this device are the complexity of the devices. In addition, the accuracy of the measurement depends on the accuracy of the response of the sensor. Since a mathematical model is used, the problem arises of its accuracy in comparison with real processes occurring in the engine.

The objective of the utility model is to create an effective and convenient diagnostic device, as well as expanding the arsenal of diagnostic systems for AC electric motors and related mechanical devices.

The technical result of the invention is to simplify the device by installing sensors in accessible places while improving the accuracy of determining the local most heated areas of the internal space of the engine.

This is achieved due to the fact that in the diagnostic device of the traction engine of an electric locomotive by determining the most heated point, containing temperature sensors installed on the engine to measure the selected operating parameters and connected to the computing unit, which is a software-computer complex, according to the utility model, to the device fiber-optic temperature sensors for engine operating parameters, a fiber-optic communication line, an optical laser source of an optical signal were introduced, and alizator optical signal characteristics, producing the necessary measuring and transmitting them to the software and computer system; while the software and computer complex consists of a computer with appropriate software connected to the sensors. In this case, the operating parameters include the temperature characteristics of the engine.

The figure shows a schematic diagram of a measuring complex.

Positions indicate: fiber-optic communication line (1); fiber optic engine parameter sensor (2); laser source of optical signal (3); optical signal characteristics analyzer (4); computer (5).

The diagnostic device for the traction engine of an electric locomotive consists of a fiber-optic communication line (1), a fiber-optic sensor for engine parameters (2), an optical laser optical signal source (3), an optical signal characteristics analyzer (4) and a computer (5) with the corresponding software software connected to sensors.

The device operates as follows.

The signal is generated by the optical laser source of the optical signal (3), and transmitted through the fiber optic line (1) to the fiber-optic sensor of engine parameters (2), the required engine characteristics (for example, temperature). After passing the fiber-optic sensor of engine parameters (2). the parameters of the optical signal change under the influence of the measured parameters of the traction motor (for example: temperature). Then, through the fiber-optic communication line (1), an optical signal with changed parameters is fed to the analyzer of the characteristics of the optical signal (4). In the analyzer of the characteristics of the optical signal (4), the parameters of the optical signal of the source signal received from the source and the signal received after passing through the sensor with the changed parameters are compared. The discrepancy between the parameters of the optical signal determines how much the controlled (diagnosed) engine parameter has changed (in this case, temperature). Changes in engine parameters, after processing from the analyzer the characteristics of the optical signal (4), are transmitted to a computer (5), in which the scale of the monitored parameter is visualized (scale of the engine temperature and its limit values).

The advantages of this device are that modern fiber-optic technologies are used. These technologies have significant advantages:

Resistance to aggressive and combustible environments.

Absolute explosion and fire safety.

Immunity

Multi-parameter sensitivity (one sensor for several engine parameters).

High performance.

Distributed measurements (sensor system in one extended fiber).

Long continuous measurements (from 25 years).

Small dimensions (2-5 cm.) And low weight and cost.

The developed technical tool will increase the operational reliability of traction electric motors, increase their mileage and turnaround times, and, therefore, reduce the cost of their operation.

This device is most effective because it allows you to store large databases on the computer with information about the monitored dynamics of damage to the motor with subsequent prediction of its failure.

Claims (2)

1. Diagnostic device for a traction engine of an electric locomotive by determining the most heated point, containing temperature sensors installed on the engine to measure selected operating parameters and connected to a computing unit, which is a software-computer complex, characterized in that fiber-optic temperature sensors are introduced into the device engine operating parameters, an optical laser source of an optical signal, an analyzer of the characteristics of the optical signal producing the necessary Measurement and transmitted them to the software and computer system; while the software and computer complex consists of a computer with software connected to the sensors. 2. A diagnostic device for a traction engine of an electric locomotive according to claim 1, characterized in that the operating parameters include temperature characteristics of the engine.