DE7827764U1 - Firedamp protected switchgear panel - Google Patents

Description

• *

CALOR-EMAG Electricity corporation

Bahnstrasse 39-47

4030 Ratingen 1

TP no. 1153 Ratingen, September 15, 1978

Firedamp protected switchgear panel

The innovation concerns a firedamp-proof high-voltage switchgear panel, that of a cell and a movable switching unit with circuit breaker that can be coupled to it and transducer unit is formed, and retractable contact pins of the switching unit into the lead-in insulators attached to the cell in a sliding manner, flame-proof intervention.

If the switching unit previously operated with high voltage is switched off when the cell is extended, it remains between them. Ladder parts and the high-voltage insulation has a capacitive residual charge that only drains away slowly. Your uncontrolled Spontaneous discharge could possibly result in a high-energy discharge spark, which could result in a fire hazard Atmosphere must be avoided at all costs.

7827764 I8.01.79

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The task of the innovation is now to ensure that this residual charge quickly, if possible already at Extending the switch unit is dismantled, the existing switch panel construction should be changed as little as possible will.

According to the innovation, one solution to this problem is to place between the high-voltage parts of the switching unit and ground potential to use a weakly conductive insulating material.

This is only required while the switching unit is being extended to be effective, but it should then be switched on in such a way that it is flameproof. The lead-in isolator is ideal for this in which the connection between the retraction contact pin on the one hand and the semiconducting insulating material designed as a contact insert on the other hand when extending can be done.

If the semiconducting insulating material is designed as an elastomer, with which the contact pin is used when moving in or out is constantly in sliding connection, it is also possible to arrange it outside of the ignition breakdown area.

There is also provision for the semiconducting

Train insulating material as an additional part, which is constantly used between the conductor parts of the switching unit and earth potential is. Another variant consists in the surfaces of the high-voltage insulation of the switching unit or that of the lead-in insulator to be provided with a conductive varnish. Known graphite paints are unsuitable for this because they have too little have specific resistance. Lacquers based on silicon carbide have proven to be useful.

Manufacture the high-voltage insulation to be weakly conductive or to make it semiconducting afterwards, e.g. by means of ion implantation is another possible solution.

7827764 01/18/79

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Purely for the purpose of innovation is a total contradiction

resistance value of the weakly conductive insulating material from 10 to \

10 \

10 ohms desirable. %

Another solution to the problem arises from a device which separates the high voltage Conductor parts of the switching unit - after a Sufficient voltage isolating distance is established, compulsorily in a flameproof area with earth potential connects.

This forced earthing is expediently derived and controlled from the extended position of the switching unit.

The innovation is intended in the following on the basis of exemplary embodiments are explained in more detail. ; The drawings show in

1 shows a section through the switch panel; \

2 shows a schematic view of the switching unit; |

3 to 5 details on the lead-in insulator. |

The switching unit is - as can be seen in FIG. 1 - built on a movable chassis 1 «It carries the circuit breaker 2, the current transformer 3» Voltage converter k, low-voltage compartments 5 »6 and the front panel 7 8 designated. In the illustrated retracted state of the switching unit, the retractable contact pins 9 of the circuit breaker engage, making contact, in mating contact pieces 10 (see FIG. 3) of the lead-in insulators 11 fastened to the inch 8. The lower contact pins 9 are attached to the current transformers 3. Since the high-voltage insulation of the switchgear panel is connected to the conductor parts and, on the other hand, to the grounded chassis 1, it can take on AbIext tasks. Discharge measures at the voltage transformers 4 are always indicated

if they are designed with two poles.

In addition to the high-voltage insulation of the switching unit, the lead-in insulators can also be surface or core conductive be executed. When making the core insulation conductive, we recommend adding aluminum powder to cast resin parts.

The arrester can nevertheless be an additional part that can be inserted at any point between the conductor and earth. According to FIG. 2, such an arrester is designed as a band clamp 12 surrounding the insulating bodies of the circuit breaker poles 2a, 2b, 2c and the current transformers 3a, 3b, 3c.

3 shows a section through the lead-in insulator. After the respective retraction contact pin 9 has separated from the mating contact piece 10 when the switching unit is extended, discharge sparks are still possible between these parts. An area 13 is therefore provided in the lead-in insulator 11, which must be penetrated by the contact pin 9 in a sliding manner and leak-proof, as long as discharge sparks are possible (protection type "flameproof enclosure"). In FIG. 3, the weakly conductive discharge insulating material is designed as a ring insert 14 and only becomes effective when the switching unit is extended. A conductive bead 15 arranged on the circumference of the entry contact pin establishes contact with the ring insert at a point in time at which tear-off sparks no longer occur between the parts 9 and 10. Since discharge sparks can again occur before or during this contact with the earthed ring insert lk , the contact point environment must be in a flameproof area. For this purpose, a cylindrical thickening of the insulating material l6 is provided on the front side of the entry contact pin 9, which, with the correspondingly designed inner wall of the lead-in insulator, forms an outwardly flameproof gap 13a.

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The solution of Fig. 3 has the advantage that the weak Conductive discharge insulation material only when discharge flows are extended is burdened. Since there is always an air gap between the bead 15 and the ring insert 14 in the operating position remains, is the tensile strength of the insertion insulator 11 easily controllable.

Constant contact between the retractable contact pin 9 and the semiconducting insulating material is also possible in areas that are not flameproof if the contact is made continuously when extending and retracting. Fig. K shows an example of this. A weakly conductive elastomer 17 attached to the cell 8 or to the lead-in insulator surrounds the contact pin 9. A sliding connection is created.

15th
i

Finally, a solution is also possible in which the necessary

s manoeuvrable discharge by fully grounding the conductor parts

is brought about. Again, this is only possible in the flameproof Area to be undertaken after a sufficient voltage separation distance between the contact pin 9 and the Voltage leading mating contact piece 10 is made. For this purpose, according to FIG. 5, a bore 18 is provided in the insertion insulator 11 through which a grounding spike 19 is attached to the Entry contact pin can be pushed. The length of the Bore ensures that no discharge spark to the outside occurs.

A positive lock 20 ensures that the grounding spike 19 is only in a certain position of the retractable contact pin 9 is inserted.

30th

Because the circuit breaker is regularly switched off when it is being extended the high-voltage line splits into two parts and discharge measures must be provided for each of them. However, you can save yourself a discharge measure if the circuit breaker - after it has reached the disconnected position again is switched on, which can inevitably occur. This means that discharge measures are only available at a single point in the Management necessary.

7827764 01/18/79

Claims (21)

ftf * / ie f. 4 <i <y * f. j TP no. 1153 Ratingen, don 15 September 1978 claims 1.) Firedamp protected high-voltage switchgear panel that from one cell and one that can be coupled to it Switching unit is formed with circuit breaker and converter unit, and retractable contact pins the switching unit into the lead-in insulators attached to the cell in a sliding manner intervene, characterized in that between the high voltage parts of the switching unit and leading A weakly conductive insulating material (semiconductor) is used. 2.) Control panel according to claim 1, characterized in that the weakly conductive insulating material only during the extension process the switching unit with high-voltage parts of the switching unit on the one hand and Earth potential is connected on the other hand. 3 ·) control panel according to claim 2, characterized in that the connection is made in the penetration insulator. 4.) control panel according to claim 3 «characterized in that the entry contact pins have a bead around the circumference, with which they can be used when driving through the insertion 7827764 I8.01.79 »2 - isolator opening in the direction of extension with the conductive one Occasional contact with the insulating material. 5 ·) Control panel according to claim 4l ·, characterized in that The bead and the conductive insulating material are arranged in relation to one another so that only then do they come into contact with one another get when there is between the entry contact pin and its mating contact piece in the lead-in insulator such a gap has formed that discharge sparks no longer occur between them. 6.) control panel according to claim 4, characterized in that the retraction contact pin - in the direction of extension before the conductive bead - a thickening of the insulating material that connects to the inner wall of the lead-in insulator Flameproof gap forms. 7 ·) Control panel according to claim 2, characterized in that the conductive insulating material is designed as an elastomer and encloses the retraction contact pin in a contact-making manner when the switching unit is extended or retracted. 8.) Control panel according to claim 1, characterized in that the weakly conductive insulating material is designed as an additional part and is constantly arranged between parts carrying high voltage and earth potential. 9 ·) Control panel according to claim 8, characterized in that the existing high-voltage insulation of the circuit breaker, converter or lead-in insulator Are the carrier of the additional part. 10.) Control panel according to claim 9i, characterized in that the additional part is shrunk onto the high-voltage insulation. 7827764 18.0179 • - ■ 3 · ™ · * 11.) control panel according to claim 8, characterized in that
the weakly conductive insulating material is designed as a band clamp, each of the high-voltage insulators of the
Surrounds the control panel.
5 12.) Control panel according to claim 8, characterized in that | the surface of the high-voltage insulation through a ■ I conductive lacquer layer is set to be weakly conductive. | 13 ·) Control panel according to claim 12, characterized in that | the lacquer layer contains silicon carbide. | l4. ) Control panel according to claim 1, characterized in that % of the insulating material of the existing high-voltage insulation of the switching unit and / or dew lead-in insulator «? i itself is set to be weakly conductive. * 15.) Control panel according to claim l4, characterized in that } the high-voltage insulation ions are implanted.
/ 16.) control panel according to claim l4, characterized in that
aluminum powder is mixed with the high-voltage insulating material. 17.) Control panel according to one of claims 1 to l6, characterized in 1 Ii indicated that the total resistance value of the if 10 ί weakly conductive insulating material is 10 ohms. fe 18) Flame-proof high-voltage switchgear panel, which is j of a cell and a couplable thereto, movable switching unit is formed with the circuit breaker and ϊ transducer unit, and Einfahrkontakt st if te '■ the switching unit in the fixed to the cell inputs: bushing insulators sliding manner flame-proof
intervene, characterized in that a device » 7827764 01/18/79 it is provided that the conductor parts of the switching unit separated from high voltage - after between these and the mating contact pieces, which are fixedly arranged in the cell, have a sufficient voltage separation distance is, compulsorily in a flameproof Area connects to earth potential. 19 ·) Switchgear panel according to claim 18, characterized in that the entry contact pins within the lead-in insulators be connected to earth potential. 20.) control panel according to claim 19 «characterized in that the wall of the lead-in insulators can be penetrated by an earthing spike, the movement of which is from the retracted position the switching unit is made dependent. 21.) Control panel according to one of claims 1 to 20, characterized in that the circuit breaker when extending the switching unit is forcibly switched on after it has reached the disconnected position, and discharge measures between the high-voltage line of the switching unit and ground potential is made only at a single point are. 7827764 18.0179