RU109723U1 - Device for monitoring the condition of insulating joints in rail chains in sections with ac electric shock - Google Patents

Device for monitoring the condition of insulating joints in rail chains in sections with ac electric shock Download PDF

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Publication number
RU109723U1
RU109723U1 RU2011114355/11U RU2011114355U RU109723U1 RU 109723 U1 RU109723 U1 RU 109723U1 RU 2011114355/11 U RU2011114355/11 U RU 2011114355/11U RU 2011114355 U RU2011114355 U RU 2011114355U RU 109723 U1 RU109723 U1 RU 109723U1
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Russia
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input
voltage
insulating
rail
voltage divider
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RU2011114355/11U
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Russian (ru)
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Виктор Иннокентьевич Шаманов
Павел Николаевич Чабан
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Государственное образовательное учреждение высшего профессионального образования "Московский государственный университет путей сообщения" (МИИТ)
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Priority to RU2011114355/11U priority Critical patent/RU109723U1/en
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Abstract

 A device for monitoring the condition of insulating joints in rail circuits in areas with AC electric traction, comprising a voltage amplifier, a receiving inductor, an indicator, two voltage dividers and two contacts, characterized in that it is additionally equipped with an indicator and two rectifier elements, the input of one of which through a voltage amplifier connected to a receiving inductor, and its output is connected to the first input of the first voltage divider and to the second input of the second voltage divider; the input of the other rectifier element is connected by contacts to the rails on opposite sides of the insulating joint, and the output of this element is connected to the second input of the first voltage divider and to the first input of the second voltage divider; the outputs of the voltage dividers are each connected to a corresponding indicator.

Description

The utility model relates to railway automation and telemechanics and can be used in the maintenance of rail chains.
A device for measuring the resistance of insulating joints in rail circuits, in which the detuning from circuits shunting the measured resistance of the insulating joint, was carried out by using a sinusoidal signal of ultrasonic frequency generated by a special generator [1]. However, even when the insulation resistance of the rail line is less than 10 Ω · km and the use of a test signal with a frequency of 80 kHz, the error in measuring the resistance of insulating joints in the range of 20-100 Ω most interesting for practice can reach 80%. In rail circuits with choke transformers, such devices are generally inoperative.
Also known is a device for measuring the resistance of insulating joints of rail chains, which provides the required measurement accuracy in any rail chains [2]. However, this device has a relatively complex circuit due to the need to use a special generator of the test signal and an additional measurement channel, which provides the detuning from the currents of the test signal, going into electric circuits connected in parallel to the measured junction.
The lower limit of the resistance of insulating joints under the conditions of exclusion of the mutual influence of adjacent rail circuits is in the range of 20-50 Ohms [3]. In areas with AC electric traction, chokes-transformers of the DT-1-150 and DT-1-300 types are currently used, in which the resistance of the main winding to a traction current with a frequency of 50 Hz is 1.0 Ohm. When the resistance of the insulating joint is reduced to 100-20 Ohms, from 0.9 to 4.76% of alternating traction current flowing along the rail thread branches into it, and this current through the joint can be used as a test signal.
The branching of the alternating traction current into the circuit through an insulating joint with a reduced resistance causes the appearance of additional asymmetry of the traction current in the rail line and in the main windings of the choke transformers. This asymmetry creates interference from the traction current for the operation of the equipment of the rail circuits connected to the choke transformers, and also increases the asymmetry of the resistance of the rail threads separated by such an insulating junction. As a result, interference from the traction current and locomotive ALSN receivers to the receivers are growing [4]. Therefore, from the point of view of the interfering effect of alternating traction current on the operation of rail circuits and ALSN, it is necessary to control the asymmetry of traction current created by insulating joints with low resistance.
The technical result is to control the asymmetry of the alternating traction current in the sections of the main windings of the inductor-transformers and in the rail line in the region of the insulating joints separating the rail circuits, and simplifying the circuit of the device.
The essence of the utility model is that the control device is additionally equipped with an indicator and two rectifier elements, the input of one of which is connected to a receiving inductor through a voltage amplifier, and its output is connected to the first input of the first voltage divider and to the second input of the second voltage divider; the input of the other rectifier element is connected by contacts to the rails on opposite sides of the insulating joint, and the output of this element is connected to the second input of the first voltage divider and to the first input of the second voltage divider; the outputs of the voltage dividers are each connected to a corresponding indicator.
The drawing shows a structural diagram of the proposed device for monitoring the condition of insulating joints in rail circuits in areas with AC electric traction.
The device contains an indicator of the magnitude of the asymmetry coefficient of the traction current 1 connected to the output of the first voltage divider 2, and an indicator of the resistance value of the insulating joint 3 connected to the output of the second voltage divider 4. The first input of the first voltage divider 2 is connected to the output of the first rectifier element 5 and to the second the input of the second voltage divider 4, and the second input of the first voltage divider 2 is connected to the output of the second rectifier element 6 and to the first input of the second voltage divider 4.
The input of the first rectifier element 5 through an amplifier 7 is connected to a receiving coil 8, connected inductively with the rail. The input of the second rectifier element 6 is connected by contacts 9 and 10 to the rail thread 11 on opposite sides of the controlled insulating joint 12 at the places where the throttle jumpers of the inductor transformers 13 and 14 are connected to the rails. The receiving inductor 8 is located on the rail between the point of connection to it pin 9 and insulating junction 12.
The equipment of the rail circuits 15 and 16 is connected to the additional windings of the choke transformers 13 and 14, respectively. Another rail thread 17 is separated by an electrically insulating joint 18.
The device operates as follows.
If the resistance of the insulating junction 12 is reduced, then when the measuring coil 8 is installed on the rail and the contacts 9, 10 are connected to the rails, voltages appear at the inputs and outputs of the first and second rectifier elements, as well as the amplifier 7. The gain of the amplifier 7 is selected so that the voltage at the outputs of the rectifier elements 5 and 6 corresponded to the actual measured values, respectively, of the current through the insulating junction and voltage drops on it .
When dividing the output signal of the second rectifier element 6 by the output signal of the first rectifier element 5 by means of a second voltage divider 4, the voltage value at its output in accordance with Ohm's law will be proportional to the resistance value insulating joint 12. The second indicator 3 is graduated so that its readings correspond to the value of this resistance.
Voltage drop at the insulating junction equal to the product of current flowing through the upper half of the main windings of the inductor-transformers 13 and 14 connected on opposite sides of the insulating joint 12, by the sum of the resistances of these halves of the main windings. On the other hand, this sum of resistances is numerically equal to the resistance of the main winding of the inductor-transformer to traction current . Therefore, the signal at the output of the first voltage divider 1 produces a signal equal to the ratio
But since, as already noted, Z DT = 1.0 Ohm, the signal at the output of the first voltage divider 2 is simply proportional to / . This value characterizes the relative contribution of the faulty insulating junction to the magnitude of the traction current asymmetry in the rail line.
The scale of the first indicator 1 can be calibrated in percent, and it will show with sufficient accuracy for practical purposes the value of the coefficient of asymmetry of the traction current in the zone of insulating joints, caused by the precautionary state of one of the joints.
When another insulating junction 18 is operational, the value of the asymmetry coefficient of the traction current is
Therefore, to quantify this contribution, the traction current must be taken into account in the denominator ; flowing in the rail thread 11, i.e. it is necessary in formula (1) to take the ratio / . However, in the range of changes in its resistance from 100 to 20 Ohms, most interesting for diagnosing the condition of the insulating joint, the magnitude of the traction current through the joint varies in the range of 0.9-4.76% of the traction current current bypassing the insulating junction through half of the main windings of the choke transformers. Therefore, the error in assessing the contribution of faulty insulating joints to the asymmetry of the traction current of the rail line with respect to / instead of relationship / is in the range from 0.5% with an insulating joint resistance of 100 Ohms to 2.6% with a value of this resistance of 20 Ohms.
In mountainous areas, when heavy trains move and in areas where suction lines of traction substations are connected to the rails, alternating traction current in rail threads can reach 700-800 or more amperes [4]. Therefore, when the resistance of the insulating junction is 20 Ohms, the asymmetry of the alternating traction current may exceed 19 A in such places, while the asymmetry of the alternating traction current of 12 A is currently considered the upper permissible limit.
Thus, the application of the proposed device provides control of the precautionary state of insulating joints in areas with alternating current electric traction both from the point of view of the mutual interfering influence of adjacent rail circuits through them, and from the point of view of the interfering influence of the traction current asymmetry on the operation of locomotive ALSN devices. The proposed device, in fact, is a device for non-destructive testing of the state of electrical resistance of insulating joints in rail circuits.
Checking the principles laid down in the operation of the device on a laboratory model confirmed that the device performed the required functions and showed its operability.
Literature
1. Sobolev Yu.V. The principles of building a complex of track converters for ACS by industrial transport (theory, development and implementation). Abstract. dis. for the competition of the scientific step. Doct. tech. sciences. Khrkov, HI-IT. 1983 .-- 46 p.
2. A.S. for invention No. 1423446 (USSR) A device for measuring the resistance of insulating joints of rail chains / Shamanov V.P., Mikhaldyk V.P. and others. Byul. inventions, 1988, No. 34. - S. 97.
3. Shamanov V.I. Mathematical modeling of the mutual influence of rail transmission paths through dividing joints // Dep. in TsNII-TEI MPS. - M .: 1988. - No. 4297. - 19 p.
4. Shamanov V.I. Interference and noise immunity of automatic locomotive alarm. Irkutsk: Publishing house of IrGUPS, 2005 .-- 236 p.

Claims (1)

  1. A device for monitoring the condition of insulating joints in rail circuits in areas with alternating current electric traction, comprising a voltage amplifier, a receiving inductor, an indicator, two voltage dividers and two contacts, characterized in that it is additionally equipped with an indicator and two rectifier elements, the input of one of which through a voltage amplifier connected to a receiving inductor, and its output is connected to the first input of the first voltage divider and to the second input of the second voltage divider; the input of the other rectifier element is connected by contacts to the rails on opposite sides of the insulating joint, and the output of this element is connected to the second input of the first voltage divider and to the first input of the second voltage divider; the outputs of the voltage dividers are each connected to a corresponding indicator.
    Figure 00000001
RU2011114355/11U 2011-04-14 2011-04-14 Device for monitoring the condition of insulating joints in rail chains in sections with ac electric shock RU109723U1 (en)

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RU2011114355/11U RU109723U1 (en) 2011-04-14 2011-04-14 Device for monitoring the condition of insulating joints in rail chains in sections with ac electric shock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2011114355/11U RU109723U1 (en) 2011-04-14 2011-04-14 Device for monitoring the condition of insulating joints in rail chains in sections with ac electric shock

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2514027C2 (en) * 2012-03-30 2014-04-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный университет путей сообщения" (МИИТ) Method of diagnosing state of electrical resistance of rails in track circuits on alternating current traction sections
RU2529564C1 (en) * 2013-02-01 2014-09-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный университет путей сообщения" (МИИТ) Device for diagnostics of condition of electric resistance of rail lines in rail track circuits in sections of ac electric traction
RU2668007C1 (en) * 2017-11-14 2018-09-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Российский университет транспорта (МИИТ)" РУТ (МИИТ) Device for control of the state of insulating joints in tonal rail circuits
RU190377U1 (en) * 2018-11-29 2019-06-28 Федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный университет путей сообщения" (СамГУПС) The control device of the electromechanical state of the insulating joint

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2514027C2 (en) * 2012-03-30 2014-04-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный университет путей сообщения" (МИИТ) Method of diagnosing state of electrical resistance of rails in track circuits on alternating current traction sections
RU2529564C1 (en) * 2013-02-01 2014-09-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный университет путей сообщения" (МИИТ) Device for diagnostics of condition of electric resistance of rail lines in rail track circuits in sections of ac electric traction
RU2668007C1 (en) * 2017-11-14 2018-09-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Российский университет транспорта (МИИТ)" РУТ (МИИТ) Device for control of the state of insulating joints in tonal rail circuits
RU190377U1 (en) * 2018-11-29 2019-06-28 Федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный университет путей сообщения" (СамГУПС) The control device of the electromechanical state of the insulating joint

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MM1K Utility model has become invalid (non-payment of fees)

Effective date: 20140415