Three-pole apparatus for a medium or high voltage cubicle and associated cubicle comprising such a three-pole apparatus

1. A three-pole apparatus to be installed in a cubicle of an electric substation, comprising:

an air-insulated three-pole disconnector configured for performing functions of isolating an electric line leaving the cubicle,

a three-pole circuit breaker configured for performing line protection functions,

a casing comprised of insulating material and at least partially internally housing said three-pole circuit breaker, wherein said casing is not sealingly closed and contains air;

wherein the three-pole circuit breaker comprises three vacuum circuit-breaker modules and the three-pole disconnector comprises three single-pole disconnector devices, wherein each of the single-pole disconnector devices in turn comprises a contact movable linearly from a service position into a disconnection position;

wherein each of the contacts, when it is in its service position, projects at least partially from the casing; and

wherein the three-pole apparatus is configured for cooperating with an earthing switch which is not enclosed into said casing.

2. The apparatus according to claim 1 , wherein

the apparatus further comprises a shaft for actuating the isolating devices, wherein the isolating device actuating shaft is supported, directly or indirectly, by the casing; and

the apparatus also comprises a shaft for actuating the vacuum circuit-breaker modules, wherein the vacuum circuit-breaker module actuating shaft is supported, directly or indirectly, by the casing.

3. The apparatus according to claim 2 , wherein the vacuum circuit-breaker module actuating shaft is arranged outside from said casing.

4. The apparatus according to claim 1 , wherein the axis of each of said movable contacts of single-pole disconnector device coincides with the axis of a respective vacuum circuit-breaker module.

5. The apparatus according to claim 1 , wherein the axis of each of said movable contacts of single-pole disconnector device is substantially vertical.

6. The apparatus according to claim 1 , wherein said three-pole disconnector comprises three guide tubes, each guide tube being configured to guide a respective contact of the three movable contacts.

7. The apparatus according to claim 4 , wherein each guide tube has at least one guiding groove formed therein for guiding a pin passing through a respective movable contact, the movement of said pin being controlled by a link rod/crank assembly operated by said shaft actuating the single-pole isolating devices.

8. The apparatus according to claim 1 , further comprising a system of levers, actuated by said shaft for actuating the vacuum circuit breaker modules, which operates movable contacts of the vacuum circuit-breaker module.

9. A cubicle of a medium or high voltage electric substation comprising:

at least one three-pole apparatus;

support guides configured to introduce, extract, or hold in position at least one three-pole apparatus,

wherein the three-pole apparatus comprises:

an air-insulated three-pole disconnector which is configured for performing functions of isolating the electric line leaving the cubicle;

a three-pole circuit breaker which is configured for performing line protection functions;

a casing comprising insulating material and which at least partially internally houses said three-pole circuit breaker;

wherein the three-pole circuit breaker comprises three vacuum circuit-breaker modules and wherein the three-pole disconnector comprises three single-pole disconnector devices, each of the single-pole disconnector devices in turn comprising a contact movable linearly from a service position into a disconnection position;

wherein each of the contacts, when it is in its service position, projects at least partially from the casing; and

wherein the three-pole apparatus is configured for cooperating with an earthing switch which is not enclosed into said casing,

wherein the cubicle also comprises a partition between voltage busbars and the three-pole apparatus, the partition having an opening through which the movable contacts of the three-pole disconnector can pass.

10. The cubicle according to claim 9 , further comprising a separating shutter movable between a first open position where it allows the movable contacts of the three-pole disconnector to pass through and a second position where it closes the opening.

11. The cubicle according to claim 10 , wherein movement of said separating shutter is dependent upon the position of the movable contacts of the three-pole disconnector.

12. The cubicle according to claim 9 , wherein movement of said separating shutter is dependent on the presence or absence of a panel for closing said cubicle.

13. The cubicle according to claim 9 , further comprising an earthing switch with an arm rotatable from a service position into an earthing position.

14. The cubicle according to claim 9 , further comprising a shaped plate electrically insulated from the cubicle, said shaped plate being connected to user line cables and to clamping terminals electrically connected to the three-pole apparatus.