WO1988001952A1 - Device for feeding electric traction line with substations, by electronic control of the wire overhead line voltage - Google Patents
Device for feeding electric traction line with substations, by electronic control of the wire overhead line voltage Download PDFInfo
- Publication number
- WO1988001952A1 WO1988001952A1 PCT/IT1987/000078 IT8700078W WO8801952A1 WO 1988001952 A1 WO1988001952 A1 WO 1988001952A1 IT 8700078 W IT8700078 W IT 8700078W WO 8801952 A1 WO8801952 A1 WO 8801952A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- feeding
- voltage
- overhead line
- line
- substations
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/02—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power with means for maintaining voltage within a predetermined range
Definitions
- the present invention relates to a device for the feeding of D.C. electric traction lines, which comprises, in each group of substations, a circuit for the voltage control, which consists of an entirely controlled three-phase Graetz bridge (thyristors) so as to mantain the voltage at the bus-bars of a substation constant in the time, as well as in predetermined points of the line, independently from the current, which is fed to and absorbed by the electric traction locomotives and by the swinging of the primary feeding voltage.
- a circuit for the voltage control which consists of an entirely controlled three-phase Graetz bridge (thyristors) so as to mantain the voltage at the bus-bars of a substation constant in the time, as well as in predetermined points of the line, independently from the current, which is fed to and absorbed by the electric traction locomotives and by the swinging of the primary feeding voltage.
- the feeding substations distributed along the railway are able to solve only partially this problem, since, even if they are able to ensure a continuous feeding of the wire line, they do not maintain the feeding voltage at a constant value, which has to be independent from the current absorbed by the trains.
- the present invention aims to solve the aforementioned problem, with the provision, in each group of substations, of a feeding stabilizing device providing an electronic control of the feeding voltage by means of three-phase Graetz bridges comprising diode bridges and thyristor bridges connected in series to one another and which will be thereinafter called "boosters".
- the feeding is carried out by means of usual copper conductors which branch off from the substation, at the output of said feeding stabilizing devices and which reach the wire overhead line in intermediate points of the line section comprised between two contiguous substations.
- the interconnection point between an auxiliary conductor of a stabilized feeding source and the wire overhead line is placed in each line section at a third of the distance between two contiguous substations so that on each intermediate line section between the two substation bars two points of stabilized feeding are provided.
- the substation bar can be provided with an analogous device so that each interconnection point with the wire overhead line can receive an electronically controlled stabilized feeding.
- the advantages of such arrangement consist first of all of having at disposal: in an equivalent manner and in every respect, two auxiliary substations along each line section without being subjected to the burdens and costs of further civil installations, primary connections, remote controls, easements, etc.
- the wire overhead line between two contiguous substations has at disposal pratically four points having a voltage, that is substantially constant in the course of the time, i.e.
- the two substation bus-bars as well as the two intermediate points of stabilized feeding can ensure an average voltage on the pantograph trolley of the electric traction locomotives higher than the voltage hitherto provided under the same conditions.
- the out-of-service line portion is always shorter than a third of the line section length, instead of the entire section length, as will be better explained in more detailed manner thereinafter.
- Figure 1 illustrates a basic diagram of the arrangement of substations and auxiliary feeding lines
- Figure 2 is a diagrammatic circuit of a substation with the electronic stabilizing devices connected to a wire overhead line;
- Figure 3 is general diagram of the extra-rapid switches and of the bus-bar sectionalizing switches which become operative in the event of a short circuit in the line;
- Figure 4 is a block diagram illustrating a system of data transmission between the wire overhead line and the substation.
- FIG. 1 The basic diagram of the feeding system is shown in Figure 1, in which three substations 1, 2, 3, are shown, which are connected to three feeding lines la, lb, lc -
- Figure 2 shows the diagrammatic circuit of a substation
- each of said three groups performs an independent electronic voltage control, since the absorptions at the points A, B, C, of the double-wire overhead line 4 are, in the whole, different from each other at any moment.
- Such an instantaneous absorption difference does not permit to use a single common substation bus-bar between the central group, which locally feeds the wire overhead line and the groups feeding the auxiliary conductors.
- Each conversion group consists of a diode bridge, or of a hexa or dodeca-phase reaction bridge connected in series to a thyristor bridge, this latter being itself of a hexa or dodeca-phase reaction kind and it will be called thereinafter "booster".
- the switches are caused to close again, and in the event that the short circuit is no more present, that signifies that said short circuit is confined in the intermediate portion of the line section (portion KL) and that therefore the remaining two portions-equal to two thirds of the length L of the line section, can be fed, thus reducing the inefficiency, time.
- the short circuit is localized in one of the two lateral portions of the line section L, as for instance, the portion HK (or the portion LM) , owing to the fact that the consideration for such lateral portions is perfectly identical, the extra-rapid switches l 3 to Ig and therefore also the sectionalizing switches Si and S2 open again.
- the control of the bridges takes place by a variation of the triggering phase of the booster thyristors. More in particular, as far as the central conversion group of substation is concerned, it is sufficient to provide a D.C./D.C. transductor having the task of sensing the instantaneous value of the voltage in that point of the wire overhead line and to use this latter to control the bridge. As far .as the conversion groups are concerned, which feed the auxiliary conductors, two solutions are possible: a) the provision of a D.C./D.C. voltage conversion transductor 9 placed on the point, in which the auxiliary conductor, (the conductor lb, for instance), intersects the contact line 4.
- the signal coming out from the transductor 9 is subjected to an analogue- digital conversion in the A/D converter 10, then it is sent, through the modem 11 and a data transmission line, to the substation, in which it will be reconverted into an analogue signal by means of a digital/analogue converter 12 and thence it is sent to control the bridge 6 of the substation 1 through a suitable interface 13 ( Figure 4).
- a suitable interface 13 Figure 4
- the local energy sources feeding the signalizing plants can be used for the feeding of the transductor and of the modem near the wire overhead line.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
A device for feeding D.C. electric traction lines, which provides, at each group of substations, a circuit for the voltage control, which operates independently from the other groups of substations so as to stabilize, on a substantially constant value i.e. independently from the current absorbed by the traction electric locomotive and independently from the normal swingings of the primary alternating voltage, the voltage, either in the bus-bars of the substations, and in two intermediate points of the line section comprise between two contiguous substations. The device consists of three-phase Graetz bridges (6) comprising a diode bridge and a thyristor bridge connected in series to one another and feeding the wire overhead line (4) by means of usual copper feeding conductors and through usual disconnecting bus-bar sectionalizing switches and extra-rapid switches (7), on the normal feeding point of the line section, as well as also in two intermediate points of the two adjacent line sections, set typically at a third of the distance between adjacent substations.
Description
DEVICE FOR FEEDING ELECTRIC TRACTION LINE WITH
SUBSTATIONS, BY ELECTRONIC CONTROL OF THE WIRE OVERHEAD LINE VOLTAGE.
The present invention relates to a device for the feeding of D.C. electric traction lines, which comprises, in each group of substations, a circuit for the voltage control, which consists of an entirely controlled three-phase Graetz bridge (thyristors) so as to mantain the voltage at the bus-bars of a substation constant in the time, as well as in predetermined points of the line, independently from the current, which is fed to and absorbed by the electric traction locomotives and by the swinging of the primary feeding voltage.
The problem which is actually present in each electric traction line, for instance, a railway fed by direct current consists in the ensuring that a nearly constant value of the feeding voltage has to be maintained in the interconnection points with the wire overhead line.
The feeding substations, distributed along the railway are able to solve only partially this problem, since, even if they are able to ensure a continuous feeding of the wire line, they do not maintain the feeding voltage at a constant value, which has to be independent from the current absorbed by the trains.
The present invention aims to solve the aforementioned problem, with the provision, in each group of substations, of a feeding stabilizing device providing an electronic control of the feeding voltage by means of three-phase Graetz bridges comprising diode bridges and thyristor bridges connected in series to one another and which will be thereinafter called "boosters".
The feeding is carried out by means of usual copper conductors which branch off from the substation, at the output of said feeding stabilizing devices and which reach the wire overhead line in intermediate points of the line section comprised between two contiguous substations.
According to a preferred embodiment of the invention, the interconnection point between an auxiliary conductor of a stabilized feeding source and the wire overhead line is placed in each line section at a third of the distance between two contiguous substations so that on each intermediate line section between the two substation bars two points of stabilized feeding are provided.
Of course, also the substation bar can be provided with an analogous device so that each interconnection point with the wire overhead line can receive an electronically controlled stabilized feeding.
The advantages of such arrangement consist first of all of having at disposal: in an equivalent manner and in every respect, two auxiliary substations along each line section without being subjected to the burdens and costs of further civil installations, primary connections, remote controls, easements, etc. In such a manner, the wire overhead line between two contiguous substations has at disposal pratically four points having a voltage, that is substantially constant in the course of the time, i.e. the two substation bus-bars as well as the two intermediate points of stabilized feeding (each provided, at a third of the distance from the respective substations), can ensure an average voltage on the pantograph trolley of the electric traction locomotives higher than the voltage hitherto provided under the same conditions.
Therefore under the same conditions of the power which is absorbed by the single electric locomotives on the wire overhead line, less current circulates and therefore there are less Joule effect losses and a more limited swinging field of the pantograph trolley voltage, while, as the current, as well as the losses along the line are equal, the available power is higher and the voltage swingings on the pantograph trolley are less.
In addition to the aforementioned advantages, there is the further advantage that in the event of a short
circuit, as far as the present configurations is concerned, the out-of-service line portion is always shorter than a third of the line section length, instead of the entire section length, as will be better explained in more detailed manner thereinafter.
The present invention will be now illustrated on the base of a preferred embodiment with reference to the accompanying drawings, in which:
Figure 1 illustrates a basic diagram of the arrangement of substations and auxiliary feeding lines;
Figure 2 is a diagrammatic circuit of a substation with the electronic stabilizing devices connected to a wire overhead line;
Figure 3 is general diagram of the extra-rapid switches and of the bus-bar sectionalizing switches which become operative in the event of a short circuit in the line; and
Figure 4 is a block diagram illustrating a system of data transmission between the wire overhead line and the substation.
The basic diagram of the feeding system is shown in
Figure 1, in which three substations 1, 2, 3, are shown, which are connected to three feeding lines la, lb, lc -
2a, 2b, 2c and 3a, 3b, 3c respectively, which are usual copper conductors feeding the wire overhead line 4 in such a manner as to separate the line section length L, between two contiguous substations, in three equal portions L/3.
Figure 2 shows the diagrammatic circuit of a substation
1 that is provided with at least three conversion groups constituted of transformers 5 and of Greatz bridges 6 which, consist of diode bridges and three-phase thyristor bridges which are per s§ well known in the art, and which therefore will be not illustrated in a more detailed manner thereinafter. Each of said three groups performs an independent electronic voltage control, since the absorptions at the points A, B, C, of the double-wire overhead line 4 are, in the whole, different from each other at any moment.
Such an instantaneous absorption difference does not permit to use a single common substation bus-bar between the central group, which locally feeds the wire overhead line and the groups feeding the auxiliary conductors.
In order to reduce the copper quantity to be used, either for cost reasons, or for reasons, or for the necessity of the provision of a suitable mechanical support on a piling support system, it is possible to use a single auxiliary feeder, feeding two overhead
lines at a point placed to a third of the line section length L thereof.
Each conversion group, as already mentioned, consists of a diode bridge, or of a hexa or dodeca-phase reaction bridge connected in series to a thyristor bridge, this latter being itself of a hexa or dodeca-phase reaction kind and it will be called thereinafter "booster".
In the application case that will be now considered, provision is made of the presence of a feeding network for a traction installation in D.C. with nominal voltage not higher than 3 kV. It is thus possible to use the usual electro-mechanical extra-rapid switches for a -protection against the short circuits on the D.C. side. Now referring to Figure 3, as a short circuit occurs in the line, it is sufficient that all the extra-rapid switches 7 from I3 to Ig are caused to open then testing their successive closure. If the short circuit has not a transient character, the extra-rapid switches I3 to 18 and successively the bus-bar sectionalizing switches S3, S4, S5 and Sg open. Then the switches are caused to close again, and in the event that the short circuit is no more present, that signifies that said short circuit is confined in the intermediate portion of the line section (portion KL) and that therefore the remaining two portions-equal to two thirds of the length L of the line section, can be fed, thus reducing the inefficiency, time.
If, on the contrary, the short circuit is localized in one of the two lateral portions of the line section L, as for instance, the portion HK (or the portion LM) , owing to the fact that the consideration for such lateral portions is perfectly identical, the extra-rapid switches l3 to Ig and therefore also the sectionalizing switches Si and S2 open again. Successively the switches I5 to Ig can be closed again, ensuring, however, the feeding of two thirds of the line section length L. By means of this operative system it can be thus obtained that, in the event of a short circuit, the inefficient line portion is, in any case, equal only to one third (L/3) of the whole length L of the line section, as has been hereinbefore already stated, and thus it does not concern the whole "line section, as at present takes place with the use of the conventional feeding systems.
The control of the bridges takes place by a variation of the triggering phase of the booster thyristors. More in particular, as far as the central conversion group of substation is concerned, it is sufficient to provide a D.C./D.C. transductor having the task of sensing the instantaneous value of the voltage in that point of the wire overhead line and to use this latter to control the bridge. As far .as the conversion groups are concerned, which feed the auxiliary conductors, two solutions are possible:
a) the provision of a D.C./D.C. voltage conversion transductor 9 placed on the point, in which the auxiliary conductor, (the conductor lb, for instance), intersects the contact line 4. The signal coming out from the transductor 9 is subjected to an analogue- digital conversion in the A/D converter 10, then it is sent, through the modem 11 and a data transmission line, to the substation, in which it will be reconverted into an analogue signal by means of a digital/analogue converter 12 and thence it is sent to control the bridge 6 of the substation 1 through a suitable interface 13 (Figure 4). For the feeding of the transductor and of the modem near the wire overhead line the local energy sources feeding the signalizing plants can be used. b) the provision of the use of a D.C. tranductor connected in series with the auxiliary feeding conductor coming out from the substation so that the product of the current, passing through the conductor, multiplied by the resistance of said conductor, represents the image of the voltage drop in the intersection point between the conductor and the wire overhead line 4.
Claims
CLA IMS
1 - A device for the feeding of an electric traction line with substations by means of an electronic control of the feeding voltage in the point of interconnection with the wire overhead line (4) characterized by the fact that each substation (1.2.3...) is provided with a plurality of feeding groups, respectively connected with a plurality of different points, (typically three), through voltage control means, operating independently from each other and having an output characteristic in the voltage-current diagram such that the continuous voltage in the substation bars and in the interconnection points with the wire overhead line is maintained substantially constant, independently from the load and swingings of the primary network.
2 - A feeding device according to claim 1, wherein each feeding group, comprising the transforming and rectifying units, is connected to single wire overhead line or to a double wire overhead lines (4) by voltage control means (6) consisting of a thyristor bridge connected in series with a reaction hexa- or dodeca- phase diode bridge and connected to the single wire overhead line or to the double wire overhead line (4) by means of usual feeding conductors.
3 - A feeding device according to claim 1, wherein each feeding group of a substation (1.2.3.) is connected to the single wire overhead line (4) or to the double wire overhead line (4) by means of independent feeding conductors on three points, of which one or more are positioned respectively upstream and downstream thereof, typically at a distance equal to a third of the length L of the line section comprised between two contiguous substations.
4 - A feeding device according to the claim 1, wherein the voltage control of the wire overhead line is performed by maintaining constant the voltage in the interconnection point between the feeding conductors (la,lb,lc, ;2a,2b,2c;3a,3b,3c) and a single wire overhead line or a double wire overhead line by means of the control of the output voltage of the thyristor bridges, the voltage input of which (or drive voltage) is branched off from said single wire or double wire oyerhead line (4) by means of D.C./D.C. transductor (9) provided on said overhead line in the case of the central group thereof, and by D.C./D.C. transductors and the data transmission line by means of suitable analogue digital and digital/analogue converters (10,11) for the remaining two groups thereof.
5 - A feeding device according to claim 1 wherein the
input voltage or drive voltage for the two lateral groups is taken from D.C. transductors connected in series with the feeding conductors coming out the substation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT48432/86A IT1197445B (en) | 1986-09-09 | 1986-09-09 | POWER SUPPLY OF AN ELECTRIC TRACTION LINE WITH SUBSTATIONS, BY ELECTRONIC ADJUSTMENT OF THE SUPPLY VOLTAGE OF THE INTERCONNECTION POINT WITH THE CONTACT LINE |
| IT48432A/86 | 1986-09-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1988001952A1 true WO1988001952A1 (en) | 1988-03-24 |
Family
ID=11266502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT1987/000078 WO1988001952A1 (en) | 1986-09-09 | 1987-07-31 | Device for feeding electric traction line with substations, by electronic control of the wire overhead line voltage |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU7808387A (en) |
| IT (1) | IT1197445B (en) |
| WO (1) | WO1988001952A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5346163A (en) * | 1991-07-19 | 1994-09-13 | Hitachi, Ltd. | Power supply regulation system for a railway |
| ES2340977A1 (en) * | 2008-01-04 | 2010-06-11 | Corporacion Zigor, S.A. | Catenary power supply system with active power supply between two electrical substations (Machine-translation by Google Translate, not legally binding) |
| RU2481203C1 (en) * | 2011-12-21 | 2013-05-10 | Борис Алексеевич Аржанников | Device to automatic voltage control at transformer station and in contact system |
| RU2547817C2 (en) * | 2013-08-28 | 2015-04-10 | Леонид Абрамович Герман | Voltage regulation method at alternating-current traction station |
| RU2714196C1 (en) * | 2018-06-08 | 2020-02-13 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный университет путей сообщения" (СамГУПС) | Device for limitation of equalizing current in alternating current contact network |
| RU2771615C1 (en) * | 2021-08-25 | 2022-05-11 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Дальневосточный государственный университет путей сообщения" (ДВГУПС) | Ac traction substation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59120530A (en) * | 1982-12-27 | 1984-07-12 | Meidensha Electric Mfg Co Ltd | Power supply equipment of double section type |
| JPS60206738A (en) * | 1984-03-31 | 1985-10-18 | Toshiba Corp | D.c. substation for electric railroad |
| JPH0692937A (en) * | 1986-01-21 | 1994-04-05 | Kyorin Pharmaceut Co Ltd | 8-alkoxyquinolonecarboxylic acid excellent in selective toxicity and salt thereof and its production |
-
1986
- 1986-09-09 IT IT48432/86A patent/IT1197445B/en active
-
1987
- 1987-07-31 AU AU78083/87A patent/AU7808387A/en not_active Abandoned
- 1987-07-31 WO PCT/IT1987/000078 patent/WO1988001952A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59120530A (en) * | 1982-12-27 | 1984-07-12 | Meidensha Electric Mfg Co Ltd | Power supply equipment of double section type |
| JPS60206738A (en) * | 1984-03-31 | 1985-10-18 | Toshiba Corp | D.c. substation for electric railroad |
| JPH0692937A (en) * | 1986-01-21 | 1994-04-05 | Kyorin Pharmaceut Co Ltd | 8-alkoxyquinolonecarboxylic acid excellent in selective toxicity and salt thereof and its production |
Non-Patent Citations (3)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Volume 10, No. 59 (M-459) (2116), 8 March 1986, & JP, A, 60206738 (Toshiba K.K.) 18 October 1985 see the Abstract * |
| PATENT ABSTRACTS OF JAPAN, Volume 8, No. 240 (M-336) (1677), 6 November 1984, & JP, A, 59120530 (Meidensha K.K.) 12 July 1984 see the Abstract * |
| PATENT ABSTRACTS OF JAPAN, Volume 9, No. 238 (M-416) (1961), 25 September 1985, & JP, A, 6092937 (Mitsubishe Denki K.K.) 24 May 1985 see the Abstract * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5346163A (en) * | 1991-07-19 | 1994-09-13 | Hitachi, Ltd. | Power supply regulation system for a railway |
| ES2340977A1 (en) * | 2008-01-04 | 2010-06-11 | Corporacion Zigor, S.A. | Catenary power supply system with active power supply between two electrical substations (Machine-translation by Google Translate, not legally binding) |
| RU2481203C1 (en) * | 2011-12-21 | 2013-05-10 | Борис Алексеевич Аржанников | Device to automatic voltage control at transformer station and in contact system |
| RU2547817C2 (en) * | 2013-08-28 | 2015-04-10 | Леонид Абрамович Герман | Voltage regulation method at alternating-current traction station |
| RU2714196C1 (en) * | 2018-06-08 | 2020-02-13 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный университет путей сообщения" (СамГУПС) | Device for limitation of equalizing current in alternating current contact network |
| RU2771615C1 (en) * | 2021-08-25 | 2022-05-11 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Дальневосточный государственный университет путей сообщения" (ДВГУПС) | Ac traction substation |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7808387A (en) | 1988-04-07 |
| IT8648432A0 (en) | 1986-09-09 |
| IT1197445B (en) | 1988-11-30 |
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