Fan capacity regulator for alternating-current locomotive

FIELD: electrical engineering; ac consists.

SUBSTANCE: proposed device designed to regulate capacity of fans driven by three-phase induction motors has traction transformer 1 with its primary winding 2 connected to supply mains, auxiliary winding 4 with terminal and intermediate leads, frequency converter built around four thyristors, and control unit 9 whose outputs are connected to control inputs of thyristors. The latter are interconnected in two groups, each having two series-connected thyristors, and are connected to terminal leads of auxiliary winding. One thyristor group is connected to winding cumulatively and other group, differentially. Three-phase induction motor 10 is characterized in enhanced number of low-speed steps; its first phase lead is connected to common point of first-group thyristors, its second phase lead, to common point of second-group thyristors, and third phase lead, to intermediate lead of auxiliary winding.

EFFECT: enlarged range of fan capacity regulation by load current, reduced cost of locomotive auxiliary power.

1 cl, 1 dwg

 

The invention relates to a Converter equipment mainly for transport purposes, and is intended, in particular, to regulate the performance of the fan drive three-phase asynchronous motors on AC locomotives.

A device for regulating the performance of fans, contains a voltage regulator, an intermediate DC voltage, stand-alone three-phase inverter and three-phase step-down transformer, the output of which is connected three-phase induction motors fan drive [1]. The capacity control fans by changing the frequency of the supply induction motors voltage. Despite a smooth frequency control voltage, in practice, the use of three fixed frequencies corresponding to three stages of motor rotational speed. The disadvantage is the complexity of the Converter, the large weight and dimensions, as well as increased losses of electric energy in the Converter.

It is also known a device for controlling the duty cycle of the AC electric locomotives containing traction transformer having a primary winding connected to the mains supply, the winding own the needs of end and intermediate conclusions, the frequency Converter consists of four thyristors and control unit, connected to their outputs and control inputs of the thyristors, and asynchronous three-phase fan drive motor, which is suitable to take as a prototype of the invention [2].

Control thyristor frequency Converter allows you to generate three-phase alternating voltage with a frequency of three times less than the frequency of the mains voltage. I.e. when the frequency of the mains voltage at 50 Hz can be obtained, the voltage at the inverter output frequency is equal 50/3=162/3Hz, which corresponds to a reduced rotational speed of the motor driving the fan. When a drive motor at a reduced rotational speed of the fan is reduced three times, and the power of the driving motor is reduced in 27 times, which provides lower power consumption for own needs of a locomotive.

When the fan operates at a nominal frequency of rotation of the supply phases of the motor directly from the limit conclusions winding your own transformer needs. Switching engine driven fan with a rated rotational speed (50 Hz) low speed (162/3Hz) and back is carried out depending on the current Naga is a narrow electrical equipment of a locomotive.

The disadvantage is the limited number of stages reduced blower speed is one that when load currents more than half of the nominal value requires switching at rated speed and entails higher costs of electric power for auxiliary needs of a locomotive.

The technical result is an increase in the number of stages of low engine speed, which allows to expand the range of capacity control fan on load current and reduce the cost of electric power for auxiliary needs of a locomotive.

The technical result in the proposed device is achieved by the fact that the thyristors are connected in two groups of two series-connected thyristor and connected to the terminal winding outputs their own needs traction transformer, and one group of thyristors included in accordance with the direction of winding, and the second counter to the common connection point of the thyristors of the first group connected to the first phase asynchronous motor, to the common connection point of the thyristors of the second group connected to the second phase asynchronous motor, and the third phase asynchronous motor is connected to the intermediate output winding your own transformer needs.

The essential distinguishing features of the offering is:

that the thyristors are connected in two groups of two series-connected thyristor and connected to the terminal winding outputs their own needs traction transformer, and one group of thyristors included in accordance with the direction of winding, and the second counter to the common connection point of the thyristors of the first group connected to the first phase asynchronous motor, to the common connection point of the thyristors of the second group connected to the second phase asynchronous motor, and the third phase asynchronous motor is connected to the intermediate output winding your own transformer needs.

Introduction in the device together a new relationship allows you to extend the range of regulation of the fan speed on load current and reduce the cost of electric power for auxiliary needs of a locomotive.

This is because the device allows for the sequential turning on of the thyristors of the two groups to form on the motor phase AC voltage with a frequency equal 50/2=25 Hz, 50/4=12.5 Hz, 50/8=6.25 Hz, etc.. in Addition, turn-cyclical turning on the thyristors of the two groups allows you to create on the motor phase AC voltage with a frequency equal 50/3=162/3Hz. Thus, the device provides an additional level of regulation of the engine speed, and russiae the camping adjustment range of performance of the fan.

The drawing shows a diagram of the device for regulating the fan speed.

A device for controlling the fan speed AC electric locomotives contains traction transformer 1 having a primary winding 2 connected to the mains supply 3 and the winding their own needs 4 with end and intermediate conclusions. The frequency Converter contains four thyristors 5, 6, 7, 8 and the control unit 9 connected by their outputs and control inputs of the thyristors. The thyristors are connected in two groups of two series-connected thyristor (5, 7 and 6, 8) and is connected to the terminal winding outputs their own needs 4. One group of thyristors 5, 7 included in accordance with the direction of winding, and the second 6, 8 - counter. Asynchronous three-phase motor 10 is connected: the first phase to the common connection point of the thyristors 5 and 7, the second phase to the common connection point of the thyristors 6 and 8, and the third phase to the intermediate output windings own needs 4.

The proposed device operates as follows. The thyristors of the Converter serves the control pulses so that the period of the output voltage was a multiple of the period of the supply voltage.

Thus, to obtain the output voltage with a frequency 50/2=25 Hz thyristors of the Converter include the following: the thyristor 5 include popup ready supply voltage 1-5-9-13-..., the thyristor 6 in half 4-8-12-16-..., the thyristor 7 in half 3-7-11-15-...and the thyristor 8 - 2-6-10-14-... half the supply voltage. To obtain the output voltage with a frequency 50/4=12.5 Hz thyristors of the Converter include the following: the thyristor 5 is included in the half cycles of the supply voltage 1-9-17-25-..., the thyristor 6 in half 8-16-24-32-..., the thyristor 7 in half 5-13-21-29-...and the thyristor 8 - 4-12-20-28-... half the supply voltage.

To obtain the same output voltage with frequency 50/3=162/3Hz thyristors of the Converter include turn-cyclically as follows: the thyristor 5 is included in the half cycles of the supply voltage 1-7-13-19-..., the thyristor 6 in half 4-10-16-22-..., the thyristor 7 in half 3-9-15-21-...and the thyristor 8 - 2-8-14-20-... half the supply voltage.

The presence of additional degrees of reduced fan speed (25 Hz) reduces its performance in two times, and the useful power of the engine 23i.e. 8 times. Since at low twice the performance of the fan ensures satisfactory electrical electric locomotive at load currents up to 0.75 nominal values, it extends the range of regulation of the fan speed on load current and can further reduce the costs of electric energy on vspomogate the global needs of a locomotive.

Technical and economic efficiency of the proposal is determined by the fact that when using it increases to two the number of steps reduced fan speed. This allows you to expand on a load current range of fan operation with reduced performance and further reduce the amount of electric power for auxiliary needs of the locomotive by 20% compared to single-stage regulation of the fan speed of a locomotive.

Sources of information

1. Leschev A.I., Matacin S., Swicki S.A. Kirillov B.C. Electric dual power EP. - "Lokomotiv", No. 11, 1999, pp.28-32.

2. The rutshtein A.M., Schupak A.A., Babin A.A. Experienced locomotive VL. - Electric and diesel traction, No. 1, 1991, .38-40.

A device for controlling the duty cycle of the AC electric locomotives containing traction transformer having a primary winding connected to the mains, winding their own needs with end and intermediate conclusions, frequency Converter, consisting of four thyristors and control unit, connected to their outputs and control inputs of the thyristors, and asynchronous three-phase fan drive motor, characterized in that the thyristors are connected in two groups of two series-connected thyristor and the connection is s to limit the conclusions winding their own needs traction transformer, one group of thyristors included in accordance with the direction of winding, and the second counter to the common connection point of the thyristors of the first group connected to the first phase asynchronous motor, to the common connection point of the thyristors of the second group connected to the second phase asynchronous motor, and the third phase asynchronous motor is connected to the intermediate output winding your own transformer needs.



 

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