Arrangement for remote control of systems with converters, in particular transformers

Description

[0001] Arrangement for remote control of systems with converters, in particular transformers. In electrical systems, remotely controlled Switches are often equipped with energy storage drives that are charged manually or electrically, e.g. by means of a motor and to trigger the activation of the relevant switch. Springs, compressed air, or weight generally serve as storage devices. The arrangement is often such that the energy storage device is not only charged at the beginning of the switching-on process, but is kept continuously charged. This means that the switch only requires the activation of the energy storage device to turn it on. If such energy storage drives are used to actuate... oil circuit breakers are used to connect network transformers to a high-voltage network, and are located outside the low voltage of the If the transformer to be switched on does not provide any other operating voltage for the elevator motor of the energy storage system, the following results. Disadvantage: If the oil switch is activated remotely, the energy storage unit is completely discharged. If, for example, as a result of... If the oil circuit breaker is immediately switched off again due to an overload of the transformer, there is no way to switch it on again without further ado, since the energy of the power storage unit is used up for the first switch-on, and low voltage is not available for electrically recharging the storage unit. more is available. Instead, it is necessary to recharge the energy storage unit manually, e.g., using a crank. Only then can the The oil switch must be activated again.

[0002] This manual operation represents a serious operational disadvantage for remotely controlled systems, since the dispatch of Staff is required, resulting in long interruptions to operations, which are particularly undesirable from a consumer perspective. The advantages of remote control are largely negated by these disadvantages of energy storage drives. The described Disadvantages arise in the same way if it is not a matter of switching remotely located power supplies, but rather if... For example, switches within a power plant can be remotely operated from a command center.

[0003] The defects could be remedied by making the energy storage devices suitable for multiple switching on after a single winding. to be dimensioned. However, this presents design difficulties, and furthermore, the energy storage system places a significant burden on the system. It requires more space and becomes considerably more expensive. This design therefore becomes uneconomical because, for operating scenarios that occur only rarely, a A relatively high capital expenditure is required.

[0004] According to the invention, the disadvantages of the known arrangements are avoided in a simple way by the fact that the charging device the energy storage device is connected to the secondary side of the transformer in such a way that the energy storage device can be charged even when the load switch that activates the transformer is open. This allows the energy storage device to be recharged. before the transformer is under load, i.e., before there is a possibility that the connection switch will disconnect the transformer and thus the This makes electrical recharging of the energy storage device impossible. Therefore, the load switch is expediently connected to the energy storage device of the connection switch. locked in such a way that the load switch can only be switched on when the energy storage device is charged.

[0005] By connection switch within the meaning of the invention is understood to be the switch which controls the connection of the transformer to the supplying network causes, while under load switch any switch that directly or indirectly causes the operational load of the transformer It should be understood.

[0006] An embodiment of the invention is shown in the drawing. The transformer b is connected via the terminal switch a. On the high-voltage side, it is connected to the indicated power source via busbars. On the low-voltage side of the transformer... A switch e is provided which connects the transformer to the consumer network, represented by a low-voltage busbar system ,e with branches f, g and lt. The weight acts as a power storage device, connected to the drum h by a cable and by means of The motor's weight can be raised by a certain amount. In its charging position, i.e., with the weight raised, the energy storage unit by a locking mechanism. Its triggering is prevented. A switching coil can be energized automatically or by remote control, whereby The locking mechanism tt releases the energy storage device – and thus causes the activation of the connection switch a. As soon as the switch a is closed, The low-voltage winding of the transformer receives voltage, but the load switch e initially remains open. The energy storage motor i, The device connected to the low-voltage side before switch c now starts up and begins to pull the weight up again. Only when Once the charging of the energy storage device is complete, the load switch c can be switched on, since only in the upper end position of the weight t the Contact m is closed, which is in series with the switching coil p of the load switch c. The transformer can therefore only be loaded when... when the energy storage device is fully recharged by the idling transformer. This effectively prevents the following: -an immediate re-tripping of the load switch c due to overload or short circuit in the secondary network of the energy storage device discharges and thereby A remote or automatic reactivation of the connection switch is rendered impossible. This could be due to contact m. (In place of the...) The switching magnet p can also be controlled by a blocking magnet or similar. For example, the load switch e can also be implemented with an energy storage device and trigger this through contact rn.

[0007] If only the connection switch is provided with overcurrent-responsive tripping devices, precautions must be taken to ensure that When the terminal block is switched off, the transformer is also disconnected from its low-voltage network, so that the resumption of The load is prevented after the connection switch is switched on again until the idling transformer reactivates the energy storage device. fully charged. This can be achieved, for example, by mechanically or electrically coupling the connection switch and the load switch in such a way that opening the connection switch necessarily also triggers the load switch.

[0008] If the transformer does not operate directly on an AC distribution system on the low-voltage side, but on rectifiers or In rotary converters, the switches present on the DC side, or rather the device controlling the rectifier's ignition circuit, can be considered as... Use load switches in accordance with the invention and lock them accordingly with the power storage drive of the AnseMußschalter.

[0009] If the load switch is also equipped with your energy storage device, the arrangement can be such that the energy storage device of the The load switch is charged by the switching movement of the connection switch and can only be triggered when the energy storage device of the The connection switch is recharged using the low voltage of the otherwise idle transformer.

[0010] Is the load switch of the transformer equipped with a reclosing device known per se equipped, for example, as a backwash switch which, after switching off the connection switch due to the low-voltage network switches off the magnetizing current flowing into the transformer and automatically switches the switch back on when the When the transformer low voltage reappears, the low-voltage-side reverse voltage switch is reactivated according to the invention. This is prevented until the power storage unit of the connection switch is recharged after it has been switched on.

Claims

[0011] PATENT CLAIMS.'-i. Arrangement for remote control of systems with converters, in particular transformers, whose primary Connection switches are equipped with energy storage drives, for which the secondary voltages of the transformers are used for charging, characterized in that the charging device of the energy storage device is connected to the secondary side of the transformer in such a way that the Energy storage devices can also be charged when the secondary load switch that activates the transformer's load is open. a. Arrangement according to claim i, characterized in that the load switch is interlocked with the energy storage device of the connection switch in such a way that the load switch can only be switched on when the energy storage device is charged.

3. Arrangement according to claims i and a, characterized in that, that the connection switch and the load switch are coupled together in such a way that when the connection switch is opened, the load switch is also opened. is triggered involuntarily. q.. Arrangement according to claims 1 to 3, characterized in that the energy storage drive of the load switch charged by the switching movement of the connection switch and only released for switching on the load switch when the Charging of the connection switch energy storage device is complete.

5. Arrangement according to claims i to q, wherein the load switch is equipped with an automatic is equipped with a restart device, characterized by a locking device that prevents automatic restart of the load switch. only allows this if the energy storage device of the connection switch is charged.

6. Arrangement according to claims 1 to 5, in particular for systems, in in which rectifiers or converters are connected to the transformer, characterized in that the load switches are located on the load side of the rectifiers or converters are located.

7. Arrangement according to claims 1 to 5, in particular for systems in which one or more rectifiers are connected to the transformer. rectifiers are connected, characterized in that the load switch is formed by the element controlling the ignition circuit of the rectifier. becomes.