DD148127A1 - OIL RECEPTION DEVICE FOR SF LOW 6 MAINTENANCE DEVICES - Google Patents

Abstract

The invention relates to maintenance devices of SF & ind 6! Hochspannungsschaltanlagen. The object and the object of the invention are to be seen in a reduction of the maintenance work (continuous operation of the maintenance equipment) and an economical use of the SF & ind 6! -Gas. This is achieved by the invention in that the filter devices have a return for the Abscheideoel of SF & ind 6! -Gases and by constructive means (use of chokes) an automatic gas-free circuit is realized, which allows a continuous operation.

Description

-Λ- 217 8 63

Field of application of the invention;

The invention can be applied to SFg maintenance devices of encapsulated high-voltage switchgear !! used to graze.

Characteristic of the known technical solutions;

In SFg maintenance systems of HV switchgear, in which SFG gas is liquefied during compression, preferably oil-free compressor sets, so-called dry-running compressors, are used. In systems storing SFg in gaseous form, compressor sets with oil lubrication are used. In these SFg maintenance systems, there is the disadvantage that impurities of SFg gas can not be avoided with oil mist. Therefore, precautions are required to put the SPg in a reusable state. It is known to use filter devices for this purpose. In this case, however, the compressor is continuously withdrawn oil during operation, so that a constant monitoring of the oil level and if necessary refilling with oil is required and the filter devices must be periodically cleaned of oil »So is a maintenance facility for SF ^ high-voltage systems known DE -OS 2 360 487, Kl. H 02 B, 13, to which a filter for cleaning and dewatering is assigned to the SFg tank »According to this state of the art, even with the use of a circulating pump for filter operation, from the point of view of the compressor set no continuous operation of the maintenance facility possible

Object of the invention:

The object of the invention is therefore to provide an oil return device which performs the required cleaning of the SFg gas at a substantially reduced expense and thus operates more economically in comparison with the known state of the art.

Explanation of the essence of the invention:

Diesi objective follows the object of the invention, according to which an oil return device is to be constructed, in which the compressor set associated deposition unnecessary an expensive maintenance of the compressor set and the filter means and allow storage of the expensive SF ^ gas in a reusable state.

According to the invention, this object is achieved in that. the series-connected compressor-radiator filter assembly at the lowest point of the filter has an oil return line communicating with the suction stage (oil pan) of the compressor set, wherein at the location of the connection of the oil return line to the filter device are provided permanently acting throttling means v ^ effective cross-section is tuned to an oil return with minimal or avoided gas flow. In a further embodiment of the inventive teaching, the filter assembly consists of coarse and fine filters connected in series, wherein the coarse and / or fine filter has the connection of the oil return line at its lowest point.

The particular advantage of the invention is the fact that when using an oil-lubricated compressor in the promotion of oil-contaminated SFg gas and Abs.cheidung of the oil in the filters through the oil return line z, B. in the lower part of the coarse filter separated oil, when metering the amount of gas for oil return through the chokes, can be automatically recycled during operation of the compressor set automatically, without special maintenance and control measures are required. This ensures continuous operation of the maintenance device *.

217 863

C ontact of use 1;

The invention will be explained in more detail below with reference to an exemplary embodiment. The accompanying drawing shows the device according to the invention in a SFg maintenance device

Thereafter, the compressor set 2 is connected with its SFg-suck side 3 to a shut-off valve 1, with which the SIV system is in communication »on the pressure side of the compressor set are after another shut-off valve 4- and a cooler 6, the filter device, preferably consisting of a Coarse filter 7 (z, B impact filter) and fine filter 8 (eg, basalt felt filter), connected behind the fine filter is the connection 15 for the SF ^ -Speicher- system. The coarse filter 7 is in an executed variant at the lowest point the oil return line 10 is connected, which contains a check valve 9 and throttles 11, 12 and an effective connection with the sump connection 14- (suction side) of the compressor set-has ο The throttles are the? / Effectiveness the oil return, wherein for optimum function, d "h ₀ while avoiding a substantial gas circulation, a throttle 11 are arranged in front of and a throttle 12 after the check valve 9. An oil return 13 starting from the fine filter 8 is also conceivable as a practicable variant. "

Claims (1)

TBO 4536 - »- 217 invention claim Oil return device for SFg-Viartungsgeräte of encapsulated high-voltage switchgear with a Verdich.ter.sat ζ j the filter devices zug-. are characterized in that the series-connected compressor-radiator filter assembly at the lowest point of the filter has an oil return line (10) which communicates with the suction stage (oil pan) of the compressor set (2), wherein in place of Connection of the Ölrückführungsleitung.an the filter device constantly acting throttle devices are provided, the effective cross-section is tuned to an oil return with minimal or avoided gas flow. Oil-repellent device according to item 1, g e k e η n characterized in that the filter assembly of coarse and fine filters connected in series (7; 8), wherein the coarse and / or fine filter at its lowest point the connection of the oil return line (10) ο For this purpose: 1 page drawing