Switchgear assembly

Abstract

A load or a generator is connected to an energy line, e.g. a ring feeder of an energy distribution network by using a switching system. For this purpose, the switching system has a thyristor circuit, which is connected in parallel to a disconnect switch and connects the transformer of the switching system to an energy line. Thereby an efficient disconnect switch can be realized, which can be dimensioned depending on the power of the load or generator.

Claims

1. A switchgear assembly, comprising: a switch disconnector; a thyristor circuit disposed in parallel with said switch disconnector; and a transformer having a primary side connected to an energy line via a parallel circuit containing said thyristor circuit and said switch disconnector and a secondary side for connection to a generator or a consumer.

2. The switchgear assembly according to claim 1, further comprising a further switch disconnector connected in series with said thyristor circuit.

3. The switchgear assembly according to claim 1, wherein said thyristor circuit contains two thyristor elements connected antiparallel.

4. The switchgear assembly according to claim 3, wherein each of said thyristor elements contains at least one thyristor, at least one parallel circuit of thryristors and/or a series circuit of thyristors.

5. The switchgear assembly according to claim 1, wherein the switchgear assembly is a ring cable switchgear assembly and the energy line is a ring line of an energy distribution system.

6. The switchgear assembly according to claim 1, wherein said switch disconnector is selected from the group consisting of a gas-insulated switch disconnector, a vacuum interrupter and an air-break disconnector.

7. The switchgear assembly according to claim 1, further comprising a control device, wherein an actuation of said switch disconnector and/or said thyristor circuit is performed by said control device.

8. The switchgear assembly according to claim 1, wherein the switchgear assembly is connected to the generator or to the consumer, and the generator or the consumer is disconnectable from or connectable to the energy line by the switchgear assembly.

9. The switchgear assembly according to claim 1, further comprising a switch selected from the group consisting of a changeover switch and a multiple changeover switch, wherein said secondary side of said transformer is connected to the generator or the consumer via said switch.

10. The switchgear assembly according to claim 9, further comprising a further thyristor circuit by which said switch is by-passable at least temporarily.

11. A method for operating switchgear, which comprises the steps of: providing a switchgear assembly containing a thyristor circuit disposed in parallel with a switch disconnector, wherein the thyristor circuit and the switch disconnector are connected to a primary side of a transformer via an energy line; and switching the thyristor circuit so as to be conducting prior to a switching operation of the switch disconnector in which the switch disconnector is opened, and in which the thyristor circuit is switched so as to be off.

12. The method according to claim 11, which further comprises switching on the thyristor circuit to take over a load current during a switchover of the switch disconnector.

13. The method according to claim 11, which further comprises measuring a current through the switch disconnector and/or through the thyristor circuit.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) In the figures:

(2) FIG. 1 shows a schematic detail of an energy distribution system with a ring circuit according to the prior art;

(3) FIG. 2 shows a schematic ring circuit, which, in addition to the illustration in FIG. 1, also has a ring cable switchgear assembly 106, which is configured in an advantageous manner with respect to the ring cable switchgear assembly 101;

(4) FIG. 3 shows, in supplementary fashion to FIG. 2, a more detailed design of the ring cable switchgear assembly 106;

(5) FIG. 4 shows, in supplementary fashion to FIG. 2 and FIG. 3, a design of the ring cable switchgear assembly with an additional switch disconnector in the branch of the thyristor circuit.

DESCRIPTION OF THE INVENTION

(6) FIG. 2 shows a schematic ring circuit which, in addition to the illustration in FIG. 1, also has a ring cable switchgear assembly 106. The ring cable switchgear assembly 106 can in this case be embodied as an alternative to the ring cable switchgear assembly 101. As will be explained in more detail below, the ring cable switchgear assembly 106 has some advantages over the ring cable switchgear assembly 101.

(7) Thus, the interruption 104 (for example the circuit breaker) is simplified, which enables a much more efficient design and use of the ring cable switchgear assembly 106.

(8) FIG. 3 shows, by way of supplementing FIG. 2, a more detailed design of the ring cable switchgear assembly 106.

(9) Thus, a switching unit 107 is proposed which has a switch disconnector 109, which enables safe isolation, in combination with a thyristor circuit 111. The switch disconnector is preferably arranged in parallel with the thyristor circuit 111. The switching unit 107 enables effective disconnection of the secondary side from the ring cable 102.

(10) The switch disconnector 109 can be embodied as a simple switch or, as shown in FIG. 3, provided with an additional grounding function 112. In combination with the grounding function 112, the switch disconnector 109 provides the following switching states: on, off and grounded. Preferably, the switch disconnector 109 is embodied as a mechanical switch.

(11) A multiple changeover switch 110, which is arranged in parallel with a thyristor circuit 114, is provided on the secondary side 108 of the transformer 113.

(12) Shortly prior to the switching operation of the switch disconnector 109 or shortly prior to the switching operation of the multiple changeover switch 110, the thyristor circuit 111 is fired at least for the duration of the switching operation of the switch disconnector 109 and thus becomes conducting. After termination of the switching operation of the switch disconnector 109, the thyristor circuit 111 becomes insulating again.

(13) A control device 120 can activate or deactivate the thyristor circuit 111 and/or the switch disconnector 109. For example, the control device 120 can comprise a combination of contactors, relays and switching elements, such as rotary switches, or else can be embodied as a digital control unit, for example for remote control via a control center.

(14) By virtue of the proposed switching unit 107, it is possible to dispense with the circuit breaker or load break switch (cf. device 104 in FIG. 1). It is also possible for a corresponding thyristor circuit 111 to be used in functionally identical fashion as part of the multiple changeover switch of the secondary side 108.

(15) FIG. 4 shows, by way of supplementing FIG. 2 and FIG. 3, a design of the ring cable switchgear assembly 106, wherein the switching unit 107 in this case has an additional switch disconnector 115 in the branch of the thyristor circuit 111.

(16) By virtue of the proposed solution, the complexity and number of components required are reduced.

(17) The invention can also advantageously be used when connecting photovoltaic systems to the supply grid. Furthermore, the invention provides an advantage in respect of costs in the case of the high numbers of components to be expected for future SMART grids.

(18) Although the invention has been illustrated and described in detail using the at least one exemplary embodiment shown, the invention is not restricted to this exemplary embodiment and other variants can be derived from this by a person skilled in the art without departing from the scope of protection of the invention.