CH636225A5 - DEVICE FOR DISCONNECTING AN INVERTER. - Google Patents

Description

The present invention relates to a device for decontrol pulses which are directly derived from the

connection of an inverter, including a mechanical contact inserted * euri.

in each phase of the output circuit of the inverter, and one, The ^ Positive according to 1 invention, can ensure in addition to the command to open all of the contacts of said circuit of the circuit breaker, the contactor function, especially in the event of an inverter failure. ss For switching from one inverter to another. To this end, the

In an installation, it is generally necessary to couple a mobile contact controlled by the electro-dynamic actuator several inverters in parallel to satisfy the need to close an electrical circuit following the supply of reliability and / or the power level and in such a coupling it coils. The same device can thus be applied to different

different criteria should be met. The classic criteria for installation annuities, in particular for continuous supply

frequency setting, phasing, amplitude, spreading of computers, ensuring even time Clrity of a wave

The breakdown of currents and the like can be easily satisfied * if they are faulty, ie switching on a backup source with inverters; but the criterion of continuity of service poses with disconnection of the faulty source.

some problems. In fact, when one of the inverters coupled in other advantages and particularities will emerge from the parallel drive on a busbar fails, there is a description which will follow from different embodiments of the in-to -vis the busbar as a source of very weak force 65 vention, given by way of examples and shown in the drawings against electromotive and can generate currents of e-appended, in which:

very important changes. The exchange currents can degra- Figure 1 is a schematic view in axial section of a der the voltage of the busbar by producing a dynamic regime disconnect device according to the invention;

3

636,225

FIG. 2 shows the parallel coupling diagram of any suitable means, well known to specialists, an im-three inverters equipped with a device according to FIG. 1; unblocking pulse of the associated thyristor 46. In the manner in FIG. 3 is a view similar to that of FIG. 2, showing the aforementioned, the switch 10 isolates the inverter 20 by opening the diagram of a source switching device; ultra-fast ture of the contacts 12 and by cutting the current in FIG. 4 schematically illustrates a supply of a 5 a time less than 3.5 milliseconds. The disrupter 10 remains a computer from three inverters; open and the busbar 58 is protected.

FIG. 5 illustrates a supply by a sewer network. The reclosing of the disrupter 10 is controlled by a course. thyristor 52 release pulse emitted manually or

In FIG. 1, a circuit breaker 10 has a bridge automatically con- tained by the inverter 20 after the fault has disappeared, tact 12 capable of cooperating with a pair of fixed contacts 10 The assembly is simple and the galvanic isolation increases the safety. -14.16, inserted into the output circuit 18 of an inverter 20. operating rity.

Only one of the phases of the circuit 18 is shown, but it is Les disrupteur 10 advantageously comprises a second clear that the disrupter 10 comprises three sets of contacts pair of fixed contacts 60,62 represented in broken line on 12,14,16 housed in a housing 22, the three movable contacts 12, FIG. 1. The contacts 60, 62 are arranged on the opposite side from being joined to open and close simultaneously. A 15 fixed contacts 14, 16 relative to the contact bridge 12, of spring 24 urges the contact bridges 12 in the closed position - so as to cooperate with the latter to close a circuit 64 ture and an actuating rod 26 connects the contact bridges 12 to, during a rapid actuation of opening of the contacts 12, 14, a conductive disc 28, for example made of copper or aluminum 16 of the disrupter 10. The latter ensures in this case the function of nium, joined , in the closed position of the disrupter 10, quick-contact re-contactor 12,60,62, and can be felt in FIG. 1, on the front face of a winding 30. The rod 20 can be used as a fast reverser.

26 extends beyond the disc 28 to cooperate with a The disruptor, contactor and rapid reverser functions unidirectional locking device 32, with corner rollers - apply well to the various inverter systems and the fi-cement 34, housed in a conical recess 36. The device in gures 3 to 5 illustrate, by way of example, three uses of the lock 32 is arranged to allow free sliding of the device according to the invention.

of the rod 26 in the opening direction of the contacts 12,14, 25 Figure 3 shows the supply of the central unit 66 and 16, and to oppose by jamming the rollers 34 in the peripherals 68 of a computer respectively by parts restricted from the recess 36 to sliding in the inverter directions 20a and 20b. In normal operation, the reverse inverter of the rod 26. 20a feeds via a disruptor 10a, equipped

A striker 38 secured to a conductive disc 40 is of a change-over contact 12a, the central unit 66, while those capable of pushing the rollers 34 against the peripheral springs 30 68 are supplied by the inverter 20b by the inter-return 42 towards the flared part of the recess 36 for reversing a disruptor 10b equipped with a change-over contact 12b. rust the rod 26. The change-over contacts 12a, 12b, are connected by connections

The disc 40 is arranged opposite a winding 44. The crossings 70 and the two inverters 20a, 20b, are synchronized seems to be locked 32 and to control the winding 30,44 is permanently between them. In the event of an inverter failure, assembled in a block forming an electrodynamic actuator. 35 example of the inverter 20a, the switch 10a reverses the contact

The winding 30 is connected by a supply circuit com- 12a to isolate the faulty inverter 20a and switch the unit taking a thyristor 46 to a capacitor bank 48, central 66 on the inverter 20b which supplies only the computer,

while the winding 44 is supplied in a similar manner FIG. 4 shows a supply of a computer by a battery of capacitors 50 by means of a three inverters 20c, 20d, 20e, the power necessary for the thyristor 52. 40 spheres 68 being much larger than that required

A disrupter 10 of this kind is described in the Swiss patent for the central unit 66. The central unit 66 is supplied with No. 600 534, to which reference will be made for further details, normal operation by the inverter 20c and peripherals The 48.50 capacitor banks are charged by 68 by the inverters 20d and 20e coupled in parallel in redundancy.

chargers not shown and when the thyristor 46 is primed dance one in two. The inverter 20c is synchronous and in phase and of a discharge of the battery of capacitors 48 in the 45 with the inverters 20d and 20e a connection comprising a coil 30, the disc 28 is repeated by electrodynamic effect disruptor 10c arranged in contactor connects the central unit 66 in the open position of the contacts 12,14,16. The busbar crew 72 of the inverters 20d and 20e.

bile 12,26,28 is retained and locked in this position by the In case of failure of the inverter 20c, the disrupter or contact-

locking device 32. An initiation of the thyristor 52 protector 10c closes quickly to switch the central unit 66 similarly evokes the repulsion of the disc 40 and the 50 on the busbar 72 and ensures the supply of the percussion computer of the rollers 34 to release the rod 26 and authorize it by the inverters 20d and 20e.

closing of the contacts 12, 14, 16 under the action of the spring 24. FIG. 5 illustrates an emergency assembly of an inverter by triggers of the thyristors 46, 52 are connected by conductors to an emergency network. In normal operation, the inverter 20b 54,56 with an electronic control incorporated in the inverter 20 supplies the usage and is synchronized with the network. In the event of and the box 22 may include cut-off chambers, 55 breakdown of the inverter, a disrupter lOf arranged in contactor with matified in the figure by deionization plates 59. ultra-fast closing closes to supply the by

FIG. 2 illustrates a parallel coupling of three backup network inverters.

their 20,20 ', 20 "on the same busbar 58 via the- The installations are considerably simplified by the combination

diary of three 10,10 ', 10 "disruptors, each associated with one of the inverter and fast disruptor types.

20,20 ', 20 "inverters. 60 The invention is of course by no means limited to the forms

In normal operation, the contacts 12,12 ′, 12 "are of execution more particularly described, but it extends to closed and the three inverters 20,20 ′, 20" supply parai- any variant remaining within the framework of equivalences, in particular the busbar 58. If one of the inverters, for example lies in a pooling of the capacitors or replaces it-

the inverter 20 fails, this faulty inverter 20 emits thyristors by equivalent devices.

2 sheets of drawings

Claims (5)

636,225 2 CLAIMS that important or by causing others to default 1. Device for disconnecting an inverter (20) * compressor-inverters. To avoid this drawback, it is advisable to isolate very nant a mechanical contact (12,14,16) inserted in each quickly the faulty inverter, even before the least phase of the output circuit of the inverter, and a command from where- current of exchange does not arise. vertex (10) of all the contacts (12,14,16) of said circuit 5 The protection of a set of inverter bars is total when in the event of a failure of the inverter, characterized in that the time insulation of the faulty inverter is less than opening command includes: approximately 5 milliseconds. The static switchers with commu- - a capacitor (48) for accumulating energy, forced electro, which are frequently used to isolate an on-tric, faulty meter, largely respond to this response time and - An electrodynamic actuator (28,30) transforming their degree of speed is even superabundant, but they present tion of said electrical energy in a mechanical impulse the disadvantage of high cost and limited reliability, none by discharge of the capacitor (48) in a galvanic winding (30) which does not isolate the faulty inverter. placed opposite a disc (28) movable conductor connected mechanically. Other known devices act on the serial branch of the nique to said set of contacts (12), to move these alternative filter to increase the impedance and limit the necks. - the latter in the open position during said discharge of the exchange currents, but they have the drawback of imposing on the densifier, alternative filter values which make it ineffective in - And a latch (32) for maintaining the dynamic regime in the open position. said mechanical contacts (12,14,16), and in that the amor- The present invention aims to remedy these drawbacks erection of a static switch (46) inserted in the circuit of nients and to allow the realization of a coupling device discharge of the capacitor (48) is controlled by a com- allowing galvanic isolation of the faulty inverter by electronic command in case of inverter failure to initiate simple and reliable means. said static switch (46) and cause rapid opening. The connection device according to the invention is characterized of said set of mechanical contacts. ^ ^ in that the opening command includes: 2. Device according to claim 1, characterized in that _ a capacitor for the accumulation of electrical energy, "said electronic control is incorporated in said inverter 25 _ an electrodynamic actuator for transforming the @ 0) * ..... , called electrical energy in a mechanical impulse by 3. Device according to claim 1 or 2, characterized by a charge of the capacitor in a coil disposed opposite the unlocking device (40,44) of said attachment (32) having a movable conductive disc mechanically connected to said in-a second actuator electrodynamics with a conductive disc seems to œntactSy to track them in the open position (40) arranged opposite a winding (44) supplied by a converter during said discharge of the capacitor, densifier (50). -and a latch holding in the open position of- . device according to 1 one of claims 1,2 or 3, charac- ^ mechanical contacts, and in that the initiation of an interrupterized by a second mechanical contact (12,60,62), associated with static tor inserted in the discharge circuit of the capacitor each of said mechanical contacts (12,14,16), said contacts is controlled by an electronic control in the event of mechanical breakdown being controlled by the same electro-actuator for initiating said static switch and provo -dynamic, so that 1 of the contacts is closed when quer the rapid opening of said set of mechanical contacts. 1 other is open and vice versa. _ _ The assembly constitutes a Thomson effect disruptor with 5. Use of the device according to claim 4, in an electronic command, which performs the isolation of the inverter in power supply deinstallation, characterized in that said takes in a time of less than 3.5 milliseconds, sufficient for the second contacts mechanical (12,60,62) are inserted in the 40 total protection of the busbar. The electronic control output circuit of a power supply synchronized to 1 on- is compatible with the inverter and is advantageously incorporated-inverter (20a, 20b, 20c) permanently, the control of said outputs to the latter. The reliability of this device is much higher with mechanical contacts (12,14,16; 12,60,62) causing that of a static discontactor and its realization is very simple, switching from the inverter to the power source . 6. Use according to claim 5, characterized in that 45 According to an embodiment of 1 invention, the reclosing of the power source is an inverter (20b, 20d, 20e) coupled to the mechanical contact is produced by a spring released by parallel effect for supplying a load. Thomson more particularly by unlocking the moving equipment of the disrupter, by Thomson effect. The opening and closing of the disrupter are then controlled by the priming 50 of thyristors or similar static switches, the