SK85493A3 - Rectifier sub-station circuit for a railway d. c. power supply, and method of providing such a supply - 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

Technical field

The invention relates to a method of operating and wiring a sub-converter for supplying electric rails with direct current, the sub-converter comprising a central rectifier unit equipped with electronic switches.

BACKGROUND OF THE INVENTION

Since sub-inverters for the supply of electric currents electrified by direct current are used in the rail terminals of the system known quick-action switches, which are adjustable to a certain switching level and safely switch off in both current overload and short-circuit current. However, these quick-release switches are relatively expensive due to their mechanical construction and, to the arc formed between their contacts, they bring certain safety and equipment problems.

This is due to, inter alia, the arcing arc which requires maintenance for relatively short periods of time.

EP-A-206 lbO also discloses thyristor switches arranged in a unidirectional busbar which, in the conduit to the central rectifier block, contain long-time semiconductor switches, which, of course, has a greater loss of equipment and also requires higher investment costs. .

In addition, it is necessary to use additional valves in order to be able to reconnect the braking energy via the station, i.e. via a sub-station.

Another solution with thyristor switches such as switches in railway terminals in conjunction with a phase current busbar 10 is also known from

DD · A-261

435th

Regardless of the modification requirements and in this case the auxiliary valves for braking energy supply, such a solution is not suitable for disconnecting a faulty rail outlet of a sub-converter system of this kind because of the required short-circuit resistance.

for example for

200 ms, the sizing of the four switches would require disproportionate costs.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method of wiring for the operation of a sub-converter for supplying electrical current with direct current which, even in the event of an operational failure in the rail terminals of the system, i.e. in the sub-converter a solution for testing the system in the event of a failure, as well as for using braking energy.

The task fulfills the method of operation of the sub-converter station on the power supply and failures of electric rails by direct current at the sub-station.

which contains a central rectifier unit, the faults in the railway terminal are switched off by an electronic switching block, which is also an integral part of the central rectifier unit.

power supply of electric railway and immediately after that it is wrong that the rail outlet is disconnected by the switch from the mains, then we switch on the electronic switch of the central rectifier unit again to switch on the power supply in the wrong rail outlet while continuing operation of trouble-free railway outlets shall be carried out by the glowing, charging and testing equipment.

The solution according to the invention is made possible.

in the event of a failure of the rail outlet of the system, for example in the case of detecting a current after switching off the electronic switches of the central rectifier unit, preferably formed as a tyre, the failure of the sub-changers was able to test the failure of the rail outlet. The tripping, preferably the tripping of the thyristors of the central rectifier unit of the unit, therefore only lasts until the respective switch (single switch) provided in the railway terminal always disconnects the contacts.

Preferably, upon successful testing of the rail outlet, the rail outlet is reconnected to the network. If the test current has a specified threshold value, the test procedure is exceeded beforehand interrupted. It can be repeated at certain intervals.

If the negative result is unchanged, the test procedure can be discontinued definitively.

Furthermore, the above-mentioned task is also fulfilled by the connection of a sub-converter station for supplying electric rails with direct current, consisting of a central unit rectifier unit, rail outlets and switches arranged therein for disconnecting the mains and a power supply device. , in particular for carrying out the method according to the invention, which is essentially as a semiconductor rectifier with an electronic switching block as an integral part of the central unit rectifier. and that a combined arc quencher is provided between the controlled and uncontrolled portion of the central rectifier unit and each pole of the switch provided in the railway terminal on the rail side. charging and testing equipment.

The thyristor of the thyristor block of the rectifier unit j is switched off by means of a connecting line between the quencher, the charging unit and the test device with a earplug provided in the rail outlet.

According to a preferred embodiment of the invention, the arc-quenching, charging and testing device has a diode arrangement adapted to be connected to the main supply point of the central rectifier unit, the cathodes of which are connected to the busbar at the inlet side. equipment and test string which are connected to the busbar on the outlet side.

On the input side of the quencher.

The charging and test devices are preferably coupled to the cathodes of the binding diodes of the anodes of the first and second quenching rods and the test rod.

The busbar on the output side is connected to two respective quenching capacitors, a positive lead of the charging device, a quenching inductance and a blocking diode an

Further preferred embodiments of the invention are set forth in the other subclaims.

Overview pb in n a_drafts

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which: FIG. 1 shows a circuit of a sub-changer of a first exemplary embodiment according to the invention, FIG. 2 shows the connection of the arc quenching and charging device and its connection to the circuit according to FIG. 1, according to a first exemplary embodiment of the invention, FIG. 3 the connection of the arc quenching, charging and testing device and its connection to the wiring according to

1, according to a further embodiment of the invention and a modification of the circuit according to FIG. 1 and according to the invention.

Example 1

A preferred embodiment of the sub-converter circuit according to the invention is shown schematically in FIG. First

A central rectifier unit 2 is connected to the supply transformer 8 via the main supply point 20, one half of which consists of a thyristor block 3 and the other half of a diode block.

4, wherein power is provided between the thyristor block 3 and the diode block.

Thereby, the central rectifier 1 and the unit 2 are constructed such that a single rectified rectifier is used.

which comprises a thyristor block 3 as a control unit with electronic switching means and a diode block 4 as an uncontrolled part. Through the positive pole 5 of the central rectifier unit 2, the unidirectional busbar of the sub-converter is supplied with current.

for example, two rail terminals 13 are connected to the busbars 6, via respective switches 7, 8, current converters 9, 10 and cable disconnectors 11,

12, so that the rail terminals 13 and 14 can be supplied with current, so that the operating current of the vehicle is guided through the negative pole 17 of the central rectifier j of the unit.

A quenching, charging and testing device 10 is connected between the main supply point 20 of the central rectifier 1 of the unit 2 and the poles 7a, 5a of the switches 7, 8 on the rail side, so that a three-phase quenching current line is connected.

the charger connected to the main supply point 20, while the connection to the poles 7a, 8a of the rail-side switches 7, 8 to the unsynchronized loop line is provided by a connecting line 23. On the other hand, the arc-quenching, charging and testing device is it is connected to the local network or to the main supply point 20 (FIG. 2) via the negative terminal 17 of the rectifier 1 of the unit 2 and via the connection terminal 22.

always connected between the non-synchronized and non-synchronized valve 24, 25, with

Next, the method of operation of the wiring of FIG. First

If, for example, a current value is detected in the current converter 9, the overload by exceeding the respective threshold will immediately switch off the thyristor block 3 of the central rectifier unit 2 by activating the charging and testing device 18 by the coupling. leadership

Then, the switch 7, preferably for a period of less than about 100 ms.

the thyristor block 3 of the rectifier 1 of the unit 2 is activated by switching on its thyristors. As a result, again, from this point on, so is the rail outlet of the system, which has no failure.

is powered again.

It is now carried out using the quench, charge and test equipment test branch and

1S check that the safety terminal 13 of the system is tested, whereby the test current flows from the quencher, charge and test device through the connecting line and the current converter 9 to the rail terminal 13. If this check exceeds * in advance of the specified test current threshold value, it is assumed to be a negative test run, and the test current is automatically turned off. The test may then optionally be repeated, even several times in predetermined periods of time, or the test current may be definitively interrupted.

If the threshold is not exceeded, the test current is switched off after a predetermined set time and the switch is closed again.

In this way, it is not possible to test the rail outlet 13 of the rail outlet 13f, since there is no nominal current flowing through the ear unsynchronized valve because the test branch of the quenching, charging such as the busbar voltage 6.

In the event that the overload of the rail 14 is switched off at any time during the check and the rail 13, the priority circuit becomes effective to carry out the overload of the rail 14 and also the test current in the rail 13.

shows an exemplary embodiment of the arc quenching, charging and testing apparatus 18 used in the sub-changer embodiment of FIG. First

This arc-quenching, charging and testing device 18 is connected by a three-phase power connection 19 to the main supply point (FIG. 1), the connection terminal 22 also representing both the lacquer and the AC connection as a three-phase power connection. A local supply or connection to the main supply point 20 of FIG. 1. The negative pole 17 leads to the central rectifier 1 of the unit 2 (see FIG. 1).

The inlet interrupter, the charging and test device 1.8 is provided with a busbar side 41 on which the diode arrangement 26 at the inlet side operates, and is provided with an interrupter device consisting of a first interrupter branch with a first interrupter. As shown in FIG

37. a first arranged second quenching branch with a second quenching thyristor and a second quenching capacitor 30 on the inlet side and a busbar 42 on the outlet side.

The device 18 comprises a charging branch with direct current supply connected to the terminal 22, the charging branch 31 being connected via its positive terminal to the busbar 42 on the output side, while its negative terminal via the charging resistor 33 connected to the cathodes of two diodes 32, 39 charging interlocks, which are each connected between the first arc thyristor 37 and the first arc quench capacitor, respectively between the second arc quench thyristor 37 and the second arc quench capacitor 30.

The quench, charger and test device test branch includes one test thyristor 27 and one resistor.

22, which are, as shown in FIG. 2a 3 arranged between the busbar 41 on the inlet side and the busbar 42 on the outlet side in parallel with the quenching branches.

In addition, between the busbar 42 and the negative pole 17 of the central rectifier j of the unit 2, a combination of RC with inductance 36 and resistance 35 is provided as a support line. The test branch with test thyristor 27 and resistor 28 and first quenching thyristor 37, quenching capacitor 38 or second quenching thyristor 29 and the quenching capacitor 30 are disconnected on the output side by a blocking diode 34. Finally, a central unsynchronized diode 40 is connected between the output terminal 42 and the negative pole 17 of the central rectifier unit 2.

Next, the operation of the circuit according to FIG. 1, in which the quenching, charging and testing device 18 has the embodiment shown in FIG. Second

Assuming an overcurrent is detected and signaled by the current converter 9, the first arc thyristor 37 is switched on and the thyristor block 3 of the thyristor block 3 of the central rectifier unit 2 is blocked, so that the thyristor block 3 is switched off. The current from the thyristor block 3 now commutes to a side branch formed by the diode array 26, the first glow thyristor 37, the first arc quench capacitor 38, the blocking diode 34, the non-synchronized loop 21, the non-synchronized valve 24, and the rail.

After blocking of the first arc thyristor 37, the first arc capacitor 38 charges very rapidly through the charging branch 31 through the diode 39 and the charging resistor 33. The unsynchronized currents from the rail terminal 13 flow through the negative pole 17, the central unsynchronized diode 40 and the unsynchronized valve 24.

Immediately thereafter, the switch 7 for disconnecting the failure rail 13 from the mains is disconnected, i.e. it is opened and the thyristor block 3 of the central rectifier unit 2 is switched on again.

From the three-phase current connection, the test diode arrangement 26, the test thyristor and the test resistor, which is now several milliohms, now conduct the test current to the unsynchronized loop loop and from there to the test rail 13 via the corresponding unsynchronized valve. Due to the disconnection of the railway terminal 13 by opening the switch 7, the test current flows essentially only to the railway terminal 13 and performs its testing. If the test current in the current transducer 9 exceeds a predetermined threshold value, the test track 13 is faulty and the automatic device switches off the test current by switching on the second arc thyristor 29. In this way, a negative voltage is applied to the test thyristor 27. it will be switched off, because at this point in time it will no longer receive any trigger pulses. Charging string 31 quickly charges again through diode 32 and charging resistor 33 second quench capacitor

30. The blocking diode 34 prevents the quenching inductance 36 and the resistor 35 from flowing bycurrent when testing ce2.

The so-called flame-retardant, charging and testing device 18 has its main connections between the input side busbar 41 and the output side busbar 42, the input side busbar 41 being connected to the diode arrangement cathodes 26 and the anodes the first quencher

37, a second arc thyristor 29 and a test thyristor

On the outlet side 42, it is connected to both the quenching capacitors 30, 38, the positive charge line 31, the quenching inductance 36 and the blocking diode 34. As non-synchronizing valves 24, 25 (FIG. 1), be used as both thyristors and diodes.

Another example of a quenching, charging and testing device 18 is shown in FIG. Third

In this case, a double-acting circuit consisting of thyristors 43, 44, 45 and 4 b is used as the quenching and charging device. In the diagonal of this thyristor arrangement, a quenching capacitor 47 and a measuring indicator 48 are provided for measuring the voltage. In this case, the charging takes place via thyristors 43 and 44, while the necessary forced shut-off is carried out via thyristors 45 and 46, respectively the inverted operation of the pairs of thyristors 43, 44 and 45, 46, respectively.

Furthermore, the method of operation corresponds practically to the embodiment of FIG. Second

Another embodiment of the sub-converter is shown in FIG. 4th

At the same time, the modification of the test equipment and railway outlets is made

13, 14 is achieved such that in addition to the non-synchronized loop 21. In this example embodiment, the test loop line 50 is provided directly to the negative pole of the rectifier 1 of the unit 2. The test loop line 50 is connected to the test loop line 50 with thyristors 51, the cathodes of which are connected to the pole 7a of the switch 7. is shown in FIG. 4

shown). testing terry lead 5.0 is connecting m 49 related coupling 42 quencher, nabi jačieho and test zar i aden i and 18 on output side, and thus with cathode b 1okovacej d odes 34 and quenching, charging and test it devices 1.8.

In this embodiment, a coupling diode 52 is also required, which is connected by its anode to the busbar 42 of the quenching, charging and testing device 18 on the output side and by its cathode to the positive pole 5 of the rectifier unit 2. In this case That is, the test thyristor 27 and test thyristor 51 of the railway terminal 13 are switched on when testing the railway terminal 1.3, and the test thyristor 27 and the test thyristor 51 of this railway terminal 14 (not shown) are switched on when testing the railway terminal 14.

The coupling diode corresponding to the coupling diode 52 of FIG. 4 can also be used in other embodiments of FIG. 2 and 3. This has the advantage that commutating or quenching currents, respectively, have a shorter path.

The non-synchronized valves 24, 25 can also be designed as thyristors.

Therefore, after the negative test run, the breakdown terminal 13 and 14 can also be completely disconnected from the unsynchronized loop line 21, so that the latter cannot be applied to the next rail in the event of a second extinguishing and testing procedure. outlet as parallel shunt.

The solution according to the invention provides an advantageous method, as well as an advantageous wiring for disconnecting the faulty rail outlet from the mains and for quenching and reconnecting the central rectifier unit to the unhindered operation of the faultless rail outlets for carrying out the fault check of the rail outlet. Simple and maintenance-free switching means are used for rail outlets, but reliable reliable shut-off is possible in case of overload or short circuit. In particular, simple and inexpensive switches can be used to disconnect the failing rail terminals. The arc quenching, charging and testing device 18 makes it possible, by means of electronic switches, in particular thyristors, to carry out simple and inexpensive testing, while taking advantage of the virtually resistance-free testing a. At the same time, the possibilities of returning the braking energy are fully preserved.

Claims (5)

PATENT CLAIMS 1. A method of operating a sub-converter for supplying electric rails with a direct current in the case of internal faults in one of the sub-converter outlets, which comprises a central rectifier and a unit, switches off after detecting a fault in the rail outlet (13, 14). the electronic switching block (3), which is an integral part of the central rectifier unit (2), the power supply for the electric railway and immediately thereafter, the faulty rail terminal (13, 14) is disconnected from the mains by a switch (7, 8). 3) the central rectifier j of the unit (2) turns on the power supply again and in the defective railway terminal (13, 14), it is tested by the arc quenching, charging and testing device (18) during continuing operation of the trouble-free railway terminals. Method according to claim 1, characterized in that the central rectifier unit (2) comprises a thyristor block (3) as an electronic switching block and a central switch-off of the thyristor block (3) is first performed to disconnect the faulty rail terminal (13, 14). and then, after opening the switch (7, 8) of the defective rail terminal (13, 14), the thyristor block (3) is switched on again. Sub-currents for direct current supply of electric rails, consisting of a central unit rectifier, rail outlets and switches arranged therein for power supply devices, in particular for carrying out the method according to claim 1, characterized in that the central rectifier unit (2) is configured as a sequenced rectifier with an electronic switching block (3) as an integral part of the central rectifier unit (2), and between the controlled and uncontrolled part of the central rectifier unit (2). 2) and in each case one pole (7a, 8a) of a switch (7, 8) provided in the railway terminal. (13. 14) on the rail side. is a combined arc quench. charge and test equipment (1 S). Connection according to claim 3, characterized in that the rectifier unit (2) consists of a thyristor block (3) and a diode block (4). Wiring according to claim 4, in that a main supply point (20) is arranged between the thyristor block (3) and the rectifier diode block (4) of the unit (2). 6th Wiring according to at least one of the preceding claims 3 to 5, characterized in that the quenching charger and the test device (18) has a diode arrangement (26) provided at the input side, connectable to the main supply point (20) of the central rectifier unit (2), the cathodes are connected to a busbar (41) on the inlet side, wherein a quenching and charging device (29) is connected to the busbar (41) on the inlet side, 30. 37, 38, 31, 32, 33, 39) and the test string (27, 23) connected to the busbar (42) on the outlet side. Wiring according to claim 6, it knows. A support branch consisting of an inductor (36) and a resistor (35) is also connected between the output terminal (42) and the negative terminal of the central rectifier unit (2). Connection according to claim 6 or 7, characterized in that the test branch (27, 28) and the quenching device (29, 30, 37, 38, 31, 32, 33, 39) on the output side are disconnected by a blocking diode (34). ). Connection according to at least one of the preceding claims 6 to 8, characterized in that a central, non-synchronized diode (40) is connected between the output busbar (42) and the negative pole (17) of the central rectifier unit (2). Connection according to at least one of the preceding claims 3 to 9, characterized in that it is. characterized in that it comprises a first arc quench line consisting of a first arc thyristor (37) and a first arc quench capacitor (38) as well as a second arc quench line consisting of a second arc thyristor (29) and a second arc thyristor (30) and a charging branch (31), wherein the charging branch (31) is connected via its positive terminal to the busbar (42) on the outlet side and its negative terminal is connected via a charging resistor (33) to the cathodes of two charging blocking diodes (32, 39) connected each between the quenching thyristor (29, 37) and the quenching capacitor (30, 38) of both quenching branches. quenching claims e Connected to 5, connected i e. at least the charging device consists of one of two 43, 46, 45, 44), wherein it is arranged (43) for measurement 12. The connection according to the preceding claims, characterized in that it is formed as a double-acting branch with two in each diagonal of the double-acting arc quenching capacitor (47) and a measuring voltage i. At least one of the preceding claims 3 to 11, characterized in that a connection line is guided to the unsynchronized loop line (21) between the quenching, charging and testing device (18) and the switch (7, 8). (23), wherein the unsynchronized loop line (21) is connected to the poles (7a, 8a) of the switches (7, 8) via the non-synchronized valves (24, 25). 13th The connection according to at least one of the preceding claims 4 to 12, characterized in that it is limited to the poles (5) of the central rectifier unit (2) and the busbar (42) of the quencher, charging and test device (18) at the output the coupling diode (52) is connected to its side and its anode is connected to the busbar (42) on the output side. Connection according to at least claims 3 to 13, characterized in that the test loop line is a charging and test device of one of the preceding 2, characterized in that the (50) is guided between the 2-hash, (18) and the switch (7, 8). a connecting line (49), wherein the test loop line (50) is connected to the poles (7a, 8a) of the switches (7, S) via the test valves (51). Connection according to claim 12, characterized in that the non-synchronized valve (24, 25) is a thyristor. lfe. Connection according to claim 12, characterized in that the non-synchronized valve (24, 25) is a diode. List of references supply transformer 1 central rectifier unit 2 thyristor block 3 diode block 4 k 1ad pole1 5 dc busbar 6 switch 7 Pole 7a switch 8 pole 8a current converter 9,10 cable disconnector 11,12 rail outlet 13,14 vehicle i d1 o 15 track 16 negative pole 17 quenching, charging and testing device 18 connection 19 three-phase main supply point 20 unsynchronized loop 21 connection terminal 22 connection line 23 unsynchronized valve 24, 25 diode arrangement 26 test thyristor 27 resistor 28 quench thyristor 29 quench capacitor 30 charging branch 31 diode 32 blocking charging charging resistor 33 blocking diode 34 resistor 35 quench inductor 36 quench thyristor 37 quench capacitor 38 39 blocking charge central unsynchronized diode 40 busbar 41 on the input busbar 42 on the output side thyristor 43. 44, 45, 46 quench capacitor 47 measuring indicator 48 connection line 49 test loop 50 thyristor 51 coupling diode 52