WO2015003864A1

WO2015003864A1 - High-voltage electric switching arrangement in a metal casing

Info

Publication number: WO2015003864A1
Application number: PCT/EP2014/061973
Authority: WO
Inventors: Francis Bournat-Querat; Fabien Carrante
Original assignee: Siemens Aktiengesellschaft
Priority date: 2013-07-10
Filing date: 2014-06-10
Publication date: 2015-01-15
Also published as: EP2824686A1

Abstract

The present invention describes a high-voltage electric switching arrangement (10) in a metal casing (300), which includes: a first switch (20) controlling, under a first switching mode, the establishment of electric contact between the first connector (30) and a third connector (50) which is earthed; the second connector (40) and the third connector (50) are separate from one another and spaced apart from the switch (20); the first switch (20) includes a first means (80, 100, 150, 200) for pushing a contact element (120) enabling the first mode by moving said contact element (120) between the first and third connectors (30, 50). The switching arrangement is finally characterised in that the second connector (40) includes a second switch (21) including a second means (71, 91, 151, 201) for moving a contact element (111) enabling, under a second switching mode, the establishment of electric contact between the first connector (30) and a second connector (40) and enabling, under a third switching mode, electric insulation of the three connectors (30, 40, 50) by moving said contact element (111) between the second connector (40) and an electric contact point (P) of the first switch (20).

Description

High voltage electrical switching arrangement under metallic envelope

The present invention relates to a metal-clad high voltage electrical switching arrangement according to the preamble of claim 1.

Substations in metallic casing (or Gas In- sulated Substation in English, commonly designated by the GIS terminology) comprise cuts elements elec tric ^¬ adapted to cutting out or supplying high voltage power systems. These electrical switching elements are controlled by modules comprising at least one arran gement ^¬ of metal-enclosed switch also appe ^¬ Lées disconnectors. Such an arrangement is cited by reference described by WO2010- 149 482 as well as Figures 1 and 2 of the present patent application as a side view and respectively a plan view of ^¬ tip section of a switch comprising an arrangement is ^¬ this state of the art. Figure 1 and 2 show AIN- if an arrangement (10) for switching (switch) high voltage power metal-clad (300) include an ^¬ nant:

a switch (20) controlling, under a first switching mode, the establishment of electrical contact between the first connector (30) and a third connector (50) connected to ground (a second connector 40 - as a fixed contact a disconnector phase - being isolated from other con ^¬ nectors),

the second connector (40) and the third connector (50) are distinct from one another and are arranged at a distance from the switch (20),

the switch (20) comprises a first pushing means (80, 100, 150, 200) of a contact element (120) allowing the first mode by a displacement of said contact element (120) between the first and third connectors (30, 50),

the switch (20) also comprises a second means of displacement (70, 90, 150, 200) of a contact element (110) allowing under a second switching mode

establishing electrical contact between the first connector (30) and a second connector (40) and allowing under a third switching mode electrical isolation of the three connectors (30, 40, 50) by a displacement of said contact element (110) between the second connector (40) and an electrical contact point of the switch (20).

In relation to Figures 1 and 2, three positions pos sible ^¬ switch 20 are defined by two types of disconnector feature:

- A first function called disconnector, for connecting or separating, by means of the movable contact 110, the first and second connectors (30, 40);

a second function known as an earthing ^switch , makes it possible to connect the first and third connectors (30, 50) by means of the movable contact 120, the third connector being connected to the envelope (300) and thus to ground (or earth), this function thus ensuring the grounding of the first connector (30).

According to these two features, the three commutative tions modes allow an institution of the three switch operating positions according to the diagram position ^¬ ment following:

- i ^iere position 1 ⁽¹ mode switching): earthing disconnector open and closed, with the first connector (30) both grounded and isolated from the second connector ^-2nd position 2 (3rd switching mode): open earthing switch and open disconnector, the three connectors (50, 30, 40) are isolated from each other;

- 3 ^rd position 3 (2nd switching mode): earthing switch open and closed, with the first and second connectors (30, 40) electrically connected.

A control mechanism of the switch thus passes successively from position 1 to position 2, then from position 2 to position 3, and vice versa.

In order to be able to intervene during maintenance operations on part of the equipment, for example in the downstream part to the left of FIG. 1, while the voltage will remain present in the upstream part to the right of FIG. operator of the electricity network will have to realize a CONSI ^¬ electric gnation. Starting from the situation of the position 3, the electrical logging will include a first step of opening the disconnector to reach the position 2, and thus separate the downstream part of the ^voltage source, then a second step of closing the section ^¬ earth neur to reach the position 1, and so to ground the downstream portion to ensure safe maintenance.

A consignment of two-step procedure involves two different people: one only needs sheave ^¬ Liser the first step, then condemn, through a cade ^¬ nas for example, the switch in position 2 'open'; the second person must only perform the second step, then condemn, by means of a padlock for example, the sec ^¬ land in position 1 "closed".

Such a switch (20) combined type "switch and earthing switch," or as three-position, do not achieve appropriately such ^¬ logging cedure, since once the switch con- damned in the "open" position by the first person, the com ^¬ setter is more maneuverable to allow ground by the second person, unless it it unlocked the switch, which would be contrary to the procedure CONSI - two stages.

In other words, the switch (20) allows centrally switching at least a phase of a switch through its positioning in three different modes of switching born ^¬ cessaires use and for steps CONSI ^¬ usual Consignations switchgear usually performed by operators of electricity distributor / manager, for example during maintenance.

In particular, when such steps Consignations rained ^¬ eral operators successively involved to put an isolator via its arrangement switching under then another switching modes described above, this being done under strict security protocols to do not endanger an electrical installation of uti ^¬ lisateurs or operators themselves. Thus, it is for example customary to meet specific customer requirements during electrical safety consignments that a first and a second operators intervene in two successive stages (according to two levels of operator qualifications) consisting on the one hand to isolate the disconnector (see "second mode / position 2" described above) according to and then ground it (see "first mode / position 1" described above). The first operator will thus act by means of the central switch (20) to impose the said second mode, then securely lock the said switch for example by means of a padlock. The second operator must be able to release the lock (cade ^¬ nas) in order to finally put the disconnector earthing. If this second operator does not immediately have unlocking means, he can not act on the central switch to switch the second mode on the first mode, which is awkward or even penalizing in case of emergency.

The object of the invention is therefore to provide a high-voltage electrical switching arrangement in metal envelope ^¬ lique not to slow down successive steps of electrical safety consignments requiring a switch ^¬ ment between at least two of three switching modes such as the mode of isolation and method of grounding neces ^¬ sitant a central intermediate locking disabling the sequence of switching modes.

Finally, the proposed arrangement should be compact, so you do not have to present a too large footprint in the metal casing, the latter may well conser ^¬ worm its external architecture and if possible internal unchanged compared to an arrangement described in Figures 1 and 2.

The invention thus provides a switching arrangement elec tric ^¬ high voltage metal-clad according to re ^¬ vendication 1.

A set of subclaims also has advantages of the invention and are more fully described through the embodiments provided with fi gures ^¬ described:

side view of a switching arrangement according to the invention, seen from above (in section) of a switching arrangement according to the invention. By analogy with FIGS. 1 and 2, FIGS. 3 and 4 thus have two views (seen from the side and above in section) of an ar ^¬ storage (10) for switching (disconnecting) a high-voltage electrical circuit under a metal envelope (300), comprising:

a first switch (20) governing under a first switching mode (position 1, see description above) the establishment of electrical contact between the first con ^¬ nector (30) and a third connector (50) connected to the ground a second connector (40) - as a fixed contact of a disconnector phase - being isolated from the other connec ^¬ tors (30, 50),

the first switch (20) comprises a first pushing means (80, 100, 150, 200) of a contact element (120) allowing the first mode (position 1, see description above) by a displacement of said element contact (120) between the first and third connectors (30, 50).

Unlike Figures 1 and 2 the arrangement is charac ^¬ rise in that

- The second connector (40) comprises a second commuta ^¬ tor (21) comprising a second means of displacement (71, 91, 151, 201) of a contact element (111) for a second switching mode (position 3 , see description above) the establishment of electrical contact between the first connector (30) and a second connector (40) and allowing under a third switching mode (position 2, see description above) an electrical isolation of the three connectors (30, 40, 50) by moving said contact element (111) between the second connector (40) and an electrical contact point (P) of the first switch (20). By means of the splitting of two switches (20, 21) of a central switch such as in FIGS 1 and 2, a dissociated ^¬ kinematic switching functions between at least two of the three switching modes is thus advantageously achieved thereby to be able to meet specific customer requirements for two-stage electrical safety logging (by two operator levels) con ^¬ sistant to isolate the device and then ground it. In particular during two usual logging steps, a first operator can isolate a disconnector (third switching mode / position 2) by means of the switching arrangement by action on the second switch (21), then lock it. Then, a second operator can independently intervene to ground the same disconnector (first mode / position 1) by means of the switching arrangement by acting on the first switch (20), without having to worry about a unlocking the second switch (21). The stages of consi ^¬ gnations are thus chained independently without loss of time.

Finally, since the second switch (21) according to FIG. 3 is integrated in the connector (40) instead of being integrated centrally in a common switch (20) according to FIG. 1, it is therefore only moved into the enclosure of the metal envelope. This has the advantage that the arrangement of commu ^¬ tation of the invention requires no clutter sup ^¬ plementary, partly internal to the enclosure and therefore external. It is therefore possible to interchange a conventional arrangement (or the disconnector with an envelope) by an arrangement ^¬ according to the invention (or the disconnector with envelope of the same architecture) in a GIS-type electrical equipment bay. The arrangement according to the invention provides that each displacement means comprises an actuator (200, 201) being Idéa ^¬ LEMENT either mechanical or electromechanical, each action ^¬ neur in particular being individually controllable by an externally arranged means to metal envelope. These actuators are arranged between the usual connectors and therefore thus do not require any additional space to that of an arrangement as in FIGS. 1 and 2. In addition, control devices (manual, electrical) or remote control actuators are placed outside the enclosure of the envelope so do not also affect the architecture of a disconnector.

An arrangement according to the invention preferably simple and remaining compact with respect to FIGS. 1 and 2 provides that the actuator (200, 201) is a rotary shaft coupled to a connecting rod (100, 91) exerting, in the direction of rotation of the shaft, a thrust or withdrawal of at least one of the ele ^¬ thrust elements (120, 111). The shaft and the connecting rod can then be coupled by a transmission means (80, 150;

71, 151), ideally comprising at least one crank (150; 151) - for example in the form of a collar - secured to the shaft and provided with a pivot-type junction (80, 71), said crank being fixed around it of a shaft section and the junction being disposed on the crank periphery to allow a pivot of the connecting rod on the junction along an axis parallel and distinctly eccentric from the axis of rotation of one shaft. The arrangement according to the invention can also provide that the moving means is a system moved by racks, gears or other drive mechanisms which are insertable into the volume formed by the (first) switch (20) and the second connector (40) of a conventional enclosure. The invention is therefore not limited to one type of means of displacement, but covers all those having a dimension equal to or less than that of a mono ^¬ switch and tri-connectors adapted to a sectioning of at least one of the phases (PI, P2, P3) in a disconnector (10).

Generally, the arrangement according to the invention provides that the rotary shaft (200, 201) has at least a portion cy ^¬ lindrique electrically insulating in order to have at least two displacement means (e.g. by pushing), each of said means being associated to the contact elements (30, 40, 50) related to an electrical phase (PI, P2, P3) type ^¬ mo no-, bi- or three phase, each phase being disposed in the same metal casing .

Claims

claims

1. Arrangement (10) for switching (switch) high voltage power metal-clad (300) include an ^¬ nant:

- a first switch (20) governing at a first switching mode setting contact electric ^¬ stick between the first connector (30) and a third connector (50) connected to ground,

- The second connector (40) and the third connector (50) are distinct from each other and arranged to say ^¬ tance of the switch (20),

the first switch (20) comprises a first pushing means (80, 100, 150, 200) of a contact element (120) allowing the first mode by a displacement of said contact element (120) between the first and troi ^¬ SIEME connectors (30, 50),

characterized in that

the second connector (40) comprises a second commu ^¬ tor (21) comprising a second moving means (71, 91, 151, 201) of a contact element (111) allowing under a second switching mode

establishing electrical contact between the first connector (30) and a second connector (40) and allowing under a third switching mode an isolated ^¬ three electrical connectors (30, 40, 50) by movement of said contact element (111) between the second connector (40) and a contact point elec tric ^¬ (P) of the first switch (20).

2. Arrangement according to claim 1 wherein each of the displacement means comprises an actuator (200, 201) being ideally either mechanical or electro-mechanical, each actuator being in particular individually commandable by a means externally disposed to

the metal envelope.

Arrangement according to claim 2 for which

the actuator (200, 201) is a rotary shaft coupled to a connecting rod (100, 91) exerting, in the direction of ro ^¬ tation of the shaft, a thrust or withdrawal on at least one of the thrust elements (120 , 111).

Arrangement according to claim 3 for which the shaft and the connecting rod are coupled by a transmission means (80, 150; 71, 151), ideally comprising at least one crank (collar) (150; 151) secured to the shaft and provided with a pivot type junction (80, 71), said ma ^¬ level being fixed around a shaft section and the junction being disposed on the periphery of the crank to allow a pivot of the connecting rod on the junction according to an axis parallel and distinctly eccentric from the axis of rotation of the shaft.

Arrangement according to claim 1 or 2 for which the moving means is a system mu by ^¬ ener cremail.

Arrangement according to claims 2 to 5, in which the rotary shaft (200, 201) has at least one electrically insulating cylindrical portion for disposing therein at least two displacement means, each of said means being associated with contact elements (30). , 40, 50) connected to an electrical phase (PI, P2, P3) of mono-, bi- or three-phase type, each of the phases being arranged under the same metal envelope.