LT3094B - Operating method and circuit arrangement for electric supply rectifier to direct current railway - Google Patents

Abstract

The invention concerns a rectifier sub-station circuit for a railway d.c. power supply, and a method of providing such a supply in the event of a malfunction at a track output of the sub-station, the sub-station having a central rectifier unit with electronic switches. The invention calls for the electronic switches (3) to be opened on detection of a malfunction in the track output (13, 14) and, immediately afterwards, the malfunctioning output to be isolated from the power supply by means of a switch (7, 8). The central rectifier unit (2) is then switched in again by closing the electronic switches (3) and a check of the malfunctioning output (13) carried out while the correctly functioning outputs (14) are allowed to continue to operate.

Description

The present invention describes a method and circuit diagram for operating a direct current ironing substation in a rail, wherein the substation has a central ironing unit provided with electronic switches.

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DC line junctions at ironing substations use known fast-acting switches, · which have a certain trigger limit to cut off overload and short-circuit current. These switches, due to their mechanical design, require a relatively high cost and, in part, the reliability of the installation due to the electric arc between the switch contacts. These switches, among other things, are subject to wear during electrical arc operation and require frequent maintenance.

Also known from EP-A-206 are thyristor switches for DC busbars, which have additional semiconductor switches in line sections to the central rectifier unit, which, of course, makes the whole unit more expensive and also requires a higher investment. In addition, additional valves must be used to access the station, i. ie, through the ironing substation, to recover the · energy generated during braking.

Another solution using thyristor switches to disconnect three-phase current collection busbars from damaged line branches is known from DD-A-261,485.

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Given the requirement also to provide additional valves for braking energy recovery here, such a way to shut down the rectifier substation line branch in the event of a failure is required because the required resistance to short-circuit current over 200 milliseconds would result in high thyristor switches.

SUMMARY OF THE INVENTION The object of the present invention is to provide a method and circuit diagram of a DC power rail ironing station which, in the event of a failure, is both cost effective and cost effective in terms of technique for connecting branch line lines, test failure and braking energy.

Looking at the DC supply of direct current. operation of the ironing substation in the event of failure of one of the line branches, this task will be solved by the central ironing unit with electronic switches according to the invention such that in the case of line faults (branch 3, the electronic switches in the ironing unit will shut down; by switching on the electronic 20th switches, the central ironing unit is switched on again and the broken line is checked for failure of other line branches. In this way, in case of line overload, short circuit, switching off the electronic switches made of thyristors in the block will disconnect the damaged line - The line is routed through regular line switches, and then immediately reinserted into the network to allow the faulty branch to be checked for malfunctioning of the ironing substations. for as long as the respective branch simple switch bridges the gap separating the contacts.

In this way, after a successful check, the opened line a t says (switches to: open 1 closed loop · again to (network)

The appropriate line branch would be turned on. If (in the event of a fault in the test branch, for example, after the central ironing, the current exceeds a certain set limit, the test may be interrupted. It may be repeated at fixed intervals. In the case of no negative result, the test is terminated definitively.

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With respect to the circuit diagram of a DC rail power supply substation with a central · electronic switches · equipped with a rectifier, the above task according to the invention is • 10 so solved that the central rectifier unit is constructed as a semiconductor rectifier between controlled and uncontrolled rectifier. on one side and a combined extinguishing-loading and checking device on the other side of the respective branch switch terminal.

The thyristors of the ironing unit block are switched off via the connecting wires. between the extinguishing-loading and checking Device and the switch of the relevant line.

According to a preferred embodiment of the present invention, the extinguishing-charging and checking device comprises a device for connecting to the main power supply of the central ironing unit A device consisting of diodes with cathodes connected to an input half-current collection cable, an extinguishing-charging device and the inspection branch and connected to the output side current collection cable.

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In most cases, the quenching-charging and inspection unit input current collection wire is' connected to the communication diode cathodes and the first and second quenching thyristors as well as to the inspection thyristor anodes.

· Output side current collection wire is connected to two dependent extinguishing capacitors, with positive charging cable, with extinguishing

- <: λ inductance and / or disconnected: by a quenching / charging device ./ / blocking diode anodes /: Other explanations of the object / y of the present invention, of which 5 are preferred, are set forth in the conventional definition.

The invention may be further elucidated by the examples and corresponding drawings. They / show: /

Fig. * - 1 is a circuit diagram of a current rectifying substation according to an example embodiment of the present invention.

FIG. 2 is a schematic diagram of the connection of the extinguishing-loading-checking device as well as its connection to FIG. 1 shows a schematic diagram of an exemplary embodiment of the invention.

Fig. 3 is a geyser-loading and checking device

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and a connection to FIG. in accordance with an exemplary embodiment of the present invention.

. FIG. 4 - FIG. 1 and FIG. Modification of the circuit diagrams shown in Fig. 2.

Realization of a circuit diagram for a current rectifier substation: a preferred example, schematically depicted _? FIG. 1. A power supply / transformer from: '1 / a power supply 20 is connected to a central current 1 level b1o every 2 consisting of a thyristor unit 3 on one side and a diode unit 4 on the other side, where Y is powered between thyristor units 3. and diode unit 4. In addition, the central current rectifier unit 2 is designed as a semiconductor rectifier, the controllable part of which is formed by electronic switching means .Thyristor unit 3 is formed and the uncontrolled part is diode unit 4. Through the ceramic unit 2 · / positive terminal 5 bus -6 is supplied with current. To DC bus 6 via line switches 7,8, as well as current transformer 9,10 and cable separators

11,12 are connected, for example, to two line branches 13,14 so that the line branches 13 and 14 are supplied with current so that the current used by the train unit 15 flows through the working rail 16 to the negative terminal 17 of the central ironing unit 2.

Between power supply point 20 of central leveling unit 2 and terminals 7a, 7b of the switch branch side, a quench-charge and inspection device 18 is connected, but such that its three-phase current terminals 19 are connected 'to the main power point 20, 8 branch terminals 7a, 7b. the connecting line 23 is connected to the free-running ground line 21.

On the other hand, the extinguishing-loading and checking device 18 is connected to the negative terminal 17 of the ironing unit 2, as well as via the terminal 22 to the local mains or also to the main power terminal 20 (Fig. 2).

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In addition, FIG. 1, between the idle line 21 and the line terminals 7,8 of the line branch switches 7,8, the idle diodes 24,25 are on.

Further explained in Figs. 1, functioning of the wiring diagram.

If, for example, the current transformer 9 is set to an increased current, i.e. the respective current limit is exceeded, the thyristor unit 3 in the central ironing unit 2 is switched off immediately, where the fire charging and checking device 18 extinguishes

...., .-. / 77 +: / + .- / 7 / ,.-. / Γ · V-7 +. / _? β '+ · 7 +: /.-,,/. The 7 / circuit / ^ operates on the + / + switch line 23. The 7 then switches off, usually no more than 100ms, the line branch switch 7 and, in connection therewith, the thyristor unit 3 of the comparator unit 2 becomes re-operable by activating its thyristors. . As a result, from. at that moment, also, the voltage in the DC bus 6 is re-energized so that the line branch 14, which is free of any faults, is again fully supplied with current.

The line branch 13 is now tested using the extinguishing-loading and checking device 18 inspection branch, where the checking current from the extinguishing-loading and checking device 18 flows through the connection line 23, the idle valve 24 and the current transformer 9 to the line branch 13. If during the inspection the pre-test limit is exceeded, then the process is interrupted, and the test current is automatically taken into account, based on the negative test run; shutting down. The check may then be repeated in or out of the case. it shall be repeated several times at predetermined intervals and, if necessary, the test current may be switched off definitively. ·.

If the limit value is not exceeded, the test current is switched off after a predetermined time and the line branch switch 7 is turned on again.

In this way, the line branch inspection is not falsified through the line branch 14, since no current is passed through its idle valve 25 and since the inspection branch 7.18 of the extinguishing-loading and checking device provides a slightly lower voltage than the DC bus.

In the event that the 1-line branch 13 / at the time of inspection / at any time, you will exceed / max 7 _; value, / interrupts line branch 14 current, takes effect, priority

switching to interrupt the maximum current at line branch 14 and also the checking current at line branch 13.

Fig. 2 shows an example of an embodiment of an extinguishing-loading and checking device 18 used. It is connected via a three-phase current terminal 19 to the main supply point 20 {Figs. 1), where the connection terminal 22 can be both a three-phase current and an alternating current • 10 input. A local power supply may be connected to the connection terminal 22 or a main supply point 20 may be connected as in FIG. 1. The negative terminal 17 is connected to the central ironing unit 2 (Fig. 1).

The extinguishing-loading and checking device 18 comprises an input half current collection wire 41 to which the diodes of the input half diode device 26 are connected and a extinguishing device consisting of a first extinguishing branch with a first extinguishing thyristor 37 and a first extinguishing capacitor 3.8. a second extinguishing line with a second extinguishing thyristor 29 and a second extinguishing capacitor 30 between the input half-current collection wire 41 and the output half-current collection line 42. The charging device for the extinguishing, loading and checking device 18 comprises a charging branch 31 together with a current supply, which is connected by its positive terminal to the current output side of the current collection wire 42, while its negative terminal is connected via a loading resistor 33 to two cathodes of the charging-blocking diode 32, 39. These diodes are respectively connected between the first quenching thyristor 37 and the first quenching capacitor 38 or between the second quenching thyristor 29 and the second quenching capacitor 30.

The check branch of the extinguishing-loading and checking device comprises a checking thyristor 27 and a resistance 28 which, as shown in Figs. 2 and 3 arranged parallel to the extinguishing branches between the input half current collecting wire 41 and the output half current collecting wire 42. '. r .....

Further, between output side current collection wire 42 and negative terminal 17 of central leveling unit 2, there is a further *

connected RC combination as a support branch with inductance 36 and 3-5--. The inspection branch 27, 28 and the extinguishing device 37, 38 as well as 29, 30 on the output side are separated by a blocking diode 34. Finally, between the output side, the current collection wire 42 and the central ironing unit 2. the negative terminal 17 is further energized by a central idle diode 40.

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The wiring diagram according to FIG. 1, in which the extinguishing-loading and checking device 18 corresponds to FIG. 2, Functioning.

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Suppose the current transformer 9 · detects too much current and gives a signal, then the first quenching thyristor 37 is turned on and the triggering impulses of the central ironing unit 2 thyristor block 3 are blocked / so that this thyristor block shuts down. The current of the thyristor unit 3 is now switched to a secondary branch consisting of a communication diode device 26, a first quenching thyristor 37, a first quenching capacitor 38, a blocking diode 34, a free-flowing ground line 21 and a free-flowing valve 24,

After closing the first extinguishing thyristor 37, the loading branch

31 through the diode 39 and the charging resistor 33 very quickly charges the first extinguishing capacitor 38. The free-current currents from the line branch 13 flow through the negative (/ (///. Terminal / 17, center idle, idle, 40, and through). valve 24.

Immediately thereafter, branch switch 7 to disconnect the 5 damaged / line, branch 13 from the mains, disconnected, and 7 central (Thyristor of the comparator unit 2 / block / 3 again / -. (/./ (('' / '' on.''/// '.': - /: - '; {(.7.' - <·. './77 ('

From the three-phase current terminal _: 19 via the communication diode device /// (10 26, test thyristor / 27>, test resistor 28, which is only alternating ßτιΩ.), Now the 'test current is transmitted to the 7th idle //// Schipper' , to line 21 And from there, through the corresponding (./freewheel // valve 24) enters / inspected (line7 branch 13. Since this line branch 13, when the line // branch (switch 7, y-disconnected), the test current from essentially flowing (only to (line / branch 13 and checking it .7 / 7 Beyond the / check /; / current limit in current transformer 9, / line branch 13 is considered violated, and the automation unit activating / second extinguishing / thyristor 29 turns off the crimp current. / Together with this output, the second capacitor 30 is supplied with / negative voltage to / / test thyristor 27 which is then switched off as it is no longer No ignition pulses Speed through load arm 31 again t is charged via diode 32 and charging resistor 33 <second (7 / quench capacitor 30. Interlock diode 34 (prevents by-passage of by-pass current through quench inductance 36 and impedance 35 during test). 18 has its main connections between the input side of the current collection wire 41 and the output side. a current collection wire 42 - where · the input side current collection wire 41 is connected to a communication / diode 26 (cathodes and a first extinguishing thyristor 37, a second extinguishing thyristor 29 and a verification (thyristor 27)

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anodes. Output current / collection wire; 42 coupled to both / quench / capacitors 30, 38, the charging branch 31 positive wire, with quenching inductance 36, and the blocking diode .34 anode. Freewheel valves 24, 25 (Fig. 1) can use not only thyristors but also diodes. ..... ... ·· 0

Another extinguishing-loading. and an example of a checking device is shown in FIG. 3. Here with a fire extinguishing device

- a two-circuit circuit consisting of thyristors 43 is used,

44, 45 and, 46. In the diagonal of these thyristors is a quench capacitor 47 and a measuring indicator 48 for measuring voltage. Here. additionally charged via thyristors 43, 44, while the required quenching occurs via thyristors 45, 46, in other words, a pair of thyristors

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43, 44 and 45, 46 perform opposite functions.

Elsewhere, the functionality is practically the same as in the example explained above in FIG. 2.

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A further embodiment of the ironing substation embodiment is shown in F'ig. 4. Here, the inspection device for the line branches 13, 14 is modified such that in addition to the free-running abutting line 21, which in this embodiment is directly connected to the negative terminal 17 of the ironing unit 2, an inspection abutting line 50 is provided. 50 are line-connected thyristors connected to their anodes

51, - whose cathodes are connected to line branch switch 7a of line branch switch 7 (line branch switch 8 not shown in Fig. 4). The inspection ground line 50 is connected via an interconnection line 49 to the output side current collection cable 42 of the extinguishing-loading and inspection device 18 and simultaneously to the extinguishing-loading and inspection device 18.

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In this embodiment, there is still a need for a diode 52, which is connected to its quenching / charging and testing device 18 / output side current collection / conductor »42: and its own cathode to the positive terminal 5 of the comparator unit 2. the diagram will operate as / that / when checking line branch 13 check thyristor / 27 -and / line branch 13 line check thyristor .51 / are on or line check 14 check check thyristor 27. and line branch 14 * (not shown) lines, check thyristor 51,

The communication diode corresponding to the communication diode 52 of FIG. 4 may also be used in the embodiments according to FIG. 2 and Fig. 3, this provides the advantage that in this case the switching or extinguishing currents' find a shorter path.

20. Thyristors may also be used with idle valves 24, 25. ·

In the event of a negative test run, the damaged line branch 13 or 14 may be completely separated from the free run. the shear line 21 so that it cannot act as a shunting connection on the other end of the line due to a failure in the second extinguishing and inspection process.

The present invention provides a useful method as well as a useful connection scheme for disconnecting a damaged line branch, as well as for extinguishing and restarting the central ironing unit without interfering with them. line branch work and the elimination of damaged single branches, d single branch connections can be used simply and do not require complicated <// a ^ • .'g '· .'-. ⁷ / ·· ' ¹ · ² .

means of jointing; Reliable and fast disconnection in case of overloads or short circuits. Especially + can be / used with simple and low cost line branch switches: 1 line fault branch isolation "-> Gé + synlmo-load and check device 18 _; enabled, << ^ with the use of electronic switches, + usually thyristors, simple and inexpensive line relay can take advantage of the special advantages of line inspection with virtually no resistance.

Claims (15)

DEFINITION OF INVENTION 1. -The mode of operation of a DC rail leveling substation, the substations of the substation line being faults and having a central ironing unit having electronic switches, are distinguished by the fact that, after recording a * fault in the line branch (13, 14), the electronic switches (3) ) switches off and immediately breaks the line branch. (13, 14) switches off the mains immediately with the switch (7,8), then, after switching on the electronic central leveling units (2), again on the broken line branch (eg 13), continuing to operate the supply current when one of the line branch switches (3) is actuated 15 intact line branches (eg 14). 2. Method according to claim 1, characterized in that the central ironing unit (2) uses a 'thyristor block' as an electronic switch. 20 (3), and disconnecting the damaged line branch (13,14) is first performed by switching off the central thyristors of the thyristor unit (3), and then immediately by activating the broken branch branch (e.g. 13) line switch (7,8). , the thyristor unit (3) is reactivated. 3. DC rail supply current R.? R ·· .'Rb R / - / A -.'- ·. ' .? A. i rλ ·. ? RAA ?. 'Ar.RRA A. R'R -. ·· -' · VA.rRrA /; . R _; .. RRR / rR? ·. r bA bA / ironing substation · ♦ wiring diagram with. central leveling unit with electronic switches, as well as line branches and 30 line disconnectors, as well as a power supply unit, characterized in that the central ironing unit (2) is designed as a semiconductor rectifier with electronic switches (3) in one central 35. ironing unit '(2) and that between the central ironing unit (2) controlled and unmanaged parts, and R is a combined extinguishing, loading, and checking device (18) for the branch half terminal (7a, 8a) of the respective line branch switch '(7,8). 4. Wiring diagram according to claim 3, characterized in that the comparator unit (2) consists of a thyristor unit (3) and a diode unit (4). 5; Connection diagram according to claim 4, characterized in that the main supply point (20) is 10 · between the rectifier unit (2) and the thyristor unit (3) and the diode unit (4). The wiring diagram according to at least one of the preceding claims 3 to 5, characterized in that The extinguishing, loading and checking device (18) on the input side has a diode device (26) connected to the central rectifying unit / (2) main power supply (20), the cathodes of which are connected to the input side current collection. wire (41) to the input side current 20 assembly wire (41) connected for extinguishing and loading · //. 7 '· 7 777.7. · '</,) // - 7 (/. 7 ..''/' 7/777 /. / 77'77''V 7 ·.: · / ··· / '. // 7) // ) 7 / -) · '/ _; 7 /.//'- 7 (. (-,) 7) -) - / (/ 7 (-; - /. 7- '-7 · / · / ·) - ··.) -):' .-7.- · -: · 'unit (29.30; 37, 38; 31, 32.33 / 39) as well as a check branch (27.28) connected to an output side current collection cable (42 ). A wiring diagram according to claim 6, characterized in that an auxiliary branch consisting of an inductance (36) and a resistance (36) is applied between the output, the half current collection wire (42) and the negative terminal of the central rectifying unit (2). 35). 10/7 // 77 ////// 7 // 7¾ Connection scheme according to claim 6 or 7, characterized in that the inspection branch (27,28) and the extinguishing device (29,30; 37,38; 31, 32, 33, 39) are separated from each other on the output side by a blocking device. 35 diode (34). / - // 15 _; . Wiring diagram according to at least one of the preceding claims 7, 4 to 6 to 8, characterized in that, between the outlet side of the assembly wire (42) and the central the negative terminal (17) of ironing unit 7 / unit (2) is energized 5 - Central Idle LED, (40) ... ··· Connection diagram according to at least one of the foregoing 3-9, characterized in that the first extinguishing branch consisting of the first extinguishing branch is provided. A quenching thyristor (37) and a first quenching capacitor (38) as well as a second quenching branch parallel thereto with a second quenching thyristorium (29) 7 / and a second quenching capacitor (30) as well as a loading branch (31), which by its positive terminal 15. connected to the output side of the current collection wire (42) and connected via its negative terminal to the two cathodes of the charging-blocking diodes (32, 39) via a loading resistor (33), respectively connected between the extinguishing thyristor (29, 37) and extinguishing 20 capacitor (30.38). A wiring diagram according to at least one of the foregoing 3 to 5, characterized in that the extinguishing and loading device is constructed as 25 is a two-circuit diagram comprising two branches with respective two thyristors (43.46; 45.44), in addition, a quench capacitor (47) and a measuring indicator (48) for measuring voltage are arranged on the diagonal of the two-circuit diagram. 30 '' Wiring diagram according to at least one of the foregoing Points 3 to 11,. bes ^: / ± 4-s / ki .rian t. in that the connection line (23) between the extinguishing, loading and checking unit (18) and the 1-way branch switch 35 4 (7,8) goes to idle grinding line / line (21) which 4 / Bolt - Connected via the '4 free / access valves (24,25) to the branch side terminals (7a, 8a) of the line branch switches (7,8). Wiring diagram according to at least one of the foregoing 5. 4-12, characterized in that, between the positive terminal (5) of the central ironing unit (2) and the output side of the extinguishing, loading and checking device (18), a current connection diode (52) with an anode is applied. connected to 10 "output half current collection cable (42) The wiring diagram according to at least one of the above-mentioned claims 3 to 13, proceeds. separating in that ^five connecting line (49) between the fighting, and loading 15 - the inspection device (18) and the line branch switch (7,8) are led to the inspection abutment line (50), which in turn is connected via the inspection valves (51) _; with the branch terminals (7a, 8a) of the line branch switches (.7,8). ^20th 15. Wiring diagram according to claim 12, characterized in that the idle valve (24,25) is a thyristor. The wiring diagram of claim 12, characterized in that: in that the idle valve (24,25) is a diode.