DE2332149A1 - Large transformer with insulating coolant - has device for monitoring water circulation - Google Patents

Abstract

The appts. consists of a tank with an adjustable outflow hole at the centre of its bottom. This hole is surrounded by a cylindrical collar, projecting into the tank with a hole in its side of a given size; a second cylinder is placed on the first, can rotate on it, and its end projects above the tank cover; it also has a hole at its lower end, and the effective clear size of the hole depends on the second cylinder position relative to the first; the size of the hole is read on an angle scale outside the tanks; the second cylinder has an overflow hole near its top end; water level in the tank is measured by an electric probe.

Description

TRANSFORMATOREN UNION AKTIENGESELLSCHAFT 7 Stuttgart-Bad Cannstatt, Deckerstr. 5

Erf.Nr. TU / FN 72/019

Lehmann / ma. 4 · 6th 1973

Device for monitoring the cooling water flow in large electrical machines cooled by insulating media, in particular transformers.

The invention relates to a device for monitoring the cooling water flow in insulating-medium-cooled electrical systems Large machines, especially transformers, consisting of a storage vessel with adjustable centrally arranged in the bottom There is an outflow opening. ·

For recooling the primary coolant, generally the insulating oil, of large electrical machines, preferably Transformers, water is often used in an open pass

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used. Because of a regular undisturbed flow of water the operational safety of the device depends, it is important to monitor the correct flow and malfunctions to be recorded and reported in good time.

A known means for detecting and reporting the trouble-free flow of cooling water is a storage vessel whose drainage opening is set so that the water accumulates up to a certain minimum height. When the water flow increases, the water level also increases. When a certain water level is reached, an overflow becomes effective, through which the excess water can flow away. When the flow of water decreases, the water level in the storage vessel and an electrical sensor to measure the height of the
Water level gives avoidance.

Such storage vessels for controlling the flow of water in cooling systems have a second function when they supply the secondary cooling of a primary cooling circuit with insulating oil. Since these storage vessels have a relatively calm open surface due to built-in calming plates
contained in the circulation of the cooling water, the lighter floating on the water collects on this surface
Insulating oil on if the primary insulating oil circuit starts to leak and oil leaks into the water circuit. This storage vessel is therefore also called an oil sifting pot, since traces of oil can be seen on the surface by looking at it.

The known constructions of this storage vessel or 01-viewing pot now have various disadvantages:
You are so sensitive, that is, in the event of a sudden,
associated with pressure drop in the drain line

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faster drainage of the cooling water, the storage vessel would run empty immediately and indicate a malfunction, if not special, costly measures would be taken, generally in a separation of the drain line in the outflow opening and collecting funnel with an air gap. There is also an external overflow when there is more inflow of cooling water, so that the device as a whole running from the overflow and from the outlet opening water sprinkler and / or water mist is distributed in the environment and must therefore be specially shielded. aside from that these known devices are not suitable if the cooling water for some reason with the atmosphere Air should not come into contact.

A monitoring device avoids all of these drawbacks of the cooling water flow in the case of insulation center-cooled Large electrical machines, in particular transformers, consisting of a storage vessel with adjustable, in the bottom centrally arranged outflow opening, in which according to the invention the outflow opening is surrounded by a collar-shaped cylinder projecting into the interior of the storage vessel is, in whose jacket there is a radial flow opening of a defined size and in which coaxial to This collar-shaped cylinder is rotatable with respect to it, a second protruding beyond the cover of the storage vessel Actuating cylinder is arranged, which is also covered in the lower area by the collar-shaped cylinder has a radial flow opening of a defined size, whereby by turning the adjusting cylinder by the extent the overlap of the flow opening in both cylinders, the effective flow cross-section can be adjusted is.

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With this device according to the invention, the tasks that can be imposed on such a device are Optimally fulfilled: a reliable flow control of the cooling water, if necessary also with remote display; the flow rate of the water can be adjusted as required and read from the outside; easy way to optical monitoring of the leakage of oil from the primary cooling circuit into the cooling water; extensive insensitivity against a suction in the drain line, so that an interruption of the drain line in outlet nozzles and Collecting funnel can be avoided. :.

By attaching a suitable scale, the angle of rotation of the adjusting cylinder with respect to the storage vessel can be read off be made, whereby the cross section of the free flow opening and thus the flow rate of the cooling water can be read directly.

If an overflow opening is arranged in the inner adjusting cylinder at the level of the desired mirror surface of the dammed water, a given excess amount of cooling water can flow through this overflow opening into the drainage line, whereby with a suitable dimensioning of the overflow opening practically an additional amount of about 100 ? O normal throughput can be managed without disruptions. The device and the surrounding area remain completely dry, as no water splashes can escape.

Based on the accompanying drawings, an embodiment of the invention, further details, as well as their Function explained in more detail.

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In the storage vessel 1 is a coaxial cylinder 2 much smaller diameter, which is with a short collar-shaped, the outflow opening in the bottom of the storage vessel comprising cylinder connector 3 in the lower area covered.

A small emptying opening is located in the collar-shaped cylinder 3 directly above the bottom of the storage vessel a 4, through which the storage vessel 1 when decommissioned, d. H. when the water supply is shut off, emptied by itself.

In the overlap area of the two cylinders 2 and 3 are openings 10 of approximately the same size are arranged in both cylinders, so that by rotating the adjusting cylinder 2 compared to the collar-shaped cylinder socket 3, the effective one Cross-section of this flow opening 10 can be adjusted as desired and thus the water drainage can be regulated can. At a suitable point, shown in the example on the upper edge of the collar-shaped cylinder 3, stops be attached, the rotation of the adjusting cylinder 3 relative to the collar-shaped cylinder 3 between zero and limit full opening.

The cooling water now passes through the inlet port 8, the introduces tangentially into the storage vessel to prevent excessive water movement, and is through the over This introduction zone attached calming plates 5 so calmed that a movement of the water in the upper Area no longer noticeable. The height of the dammed water level can be indicated on a water level mark or scale 6 can be read from above.

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For electrical monitoring of the circuit and given At least for the remote display, a sensing element 12 is immersed in the surface of the water when the water level drops and thus endangerment of the cooled machines by failure of the cooling water flow reports or alarms gives.

According to a further development of the invention, the water level is in the adjusting cylinder 2 at the desired height an overflow opening is attached, through which this excess, without disturbances or moisture penetration, if there is more water the environment, can flow away.

If you want from the ongoing monitoring for oil traces Leaks in the primary cooling circuit by the staff become independent, or if you want to achieve a remote display, it is expedient to use an electrical one Oil detector 11 attached, the sensing element just scans the water surface in the storage vessel.

In Figure 2, a development of the invention is shown in which this oil sensing element is designed as a float so that it can always exactly detect even the tiniest traces of oil floating on the surface of the water, too if the water level rises or falls slightly as a result of pressure fluctuations in the supply system. Another The solution is to attach a bypass line 19 at the water level. A small part of the water flow is conducted via an oil trace measuring device, which is located on the pot itself or attached to another suitable location.

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It is also shown in FIG. 2 that the storage vessel 1 is closed by a tightly closing cover 16 is, wherein the adjusting cylinder 2 is sealed with respect to this cover by a stuffing box 14. In the lid is a transparent sight glass 15 let through which the water level mark 6, as well as the water level can be observed.

For certain applications, especially in nuclear power plants, it is necessary to completely protect the water from the ingress of oxygen. In such systems a fully desalinated water is used, in which the remaining oxygen is bound by adding hydrazine or sodium nitrite. About no new oxygen to allow penetration into the water, the device for monitoring the cooling water flow according to the invention must also be completely sealed. This is done by closing the storage vessel 1 by means of the cover 16, as shown in Figure 2; here the necessary ventilation is provided, for example, via a on the pitot tube A filter that removes oxygen from the air causes it. One of the oxygen flowing through the air The extracting filter is, for example, a soda-lime template.

With the device according to the invention is a reliable Device given for monitoring the flow rate of cooling water through large electrical devices, especially transformers, This also means that the machines are reliably monitored for possible leaks in the primary oil circuit allows, especially when the cooling water circuit is completely closed off.

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Claims (11)

TRANSFORMATOREN UNION AKTIENGESELLSCHAFT 7 Stuttgart-Bad Cannstatt, Deckerstr. 5 Erf.Nr. TU / FN 72/019 Lehmann / ma. 4 · 6th 1973 Patent claims M.! Device for monitoring the cooling water flow at - Insulating-medium-cooled large electrical machines, in particular transformers, consisting of a storage vessel with adjustable outflow opening arranged centrally in the base, characterized in that the outflow opening surrounded by a collar-shaped cylinder (3) protruding into the interior of the storage vessel is, in the shell there is a radial flow opening (to) of a defined size and that coaxial to This collar-shaped cylinder (3) is rotatable in relation to it and protrudes beyond the cover of the storage vessel second adjusting cylinder (2) is arranged, which is also in the lower by the collar-shaped cylinder covered area a radial flow opening (10) Has a defined size, by turning the adjusting cylinder (2) by the extent of the overlap of the flow openings (10) in both cylinders, the effective flow area can be adjusted. 409883/0623 2332H9 2. Device according to claim 1, characterized in that that the adjustable effective flow cross-section can be read from the outside on an angled scale (17). 3. Device according to claim 1 or 2, characterized in that that the adjusting cylinder (2) has an overflow opening (9) in the upper area. 4. Device according to claim 1 to 3> characterized in that that the height of the water level in the storage vessel (1) is monitored by an electrical sensor (12). 5. Device according to one of claims 1 to 4, characterized in that a further electrical Sensing element (11) for determining traces of oil on the Water surface is arranged. 6. Device according to claim 5 »characterized in that the sensing element (11) is designed as a float is. (Figure 2). 7 · device according to claim 1 to 4, characterized in that is provided a bypass line (19) between the storage vessel (1) and the cylinder (3), _t is connectable a Ölspurenmeßgerät (20). 8. Device according to one of claims 1 to 7 »characterized in that the lid of the storage vessel (1) transparent or equipped with a transparent window (15) for visual control of the water level is. (Figure 2). 409883/0623 2332H9 - t - . 40 * 9. Device according to one of claims 1 to 8, characterized in that the bottom of the vessel in which the A smaller emptying outlet (4) is arranged surrounding the collar-shaped cylinder (3) surrounding the discharge opening. 10. Device according to one of claims 1 to 9> characterized in that the storage vessel (1) and to this the adjusting cylinder (2) by means of a stuffing box (14) are completely sealed and on the adjusting cylinder (2) one of the inflowing or sucked in air oxygen-removing filter (18) is arranged. 11. Device according to claim 10, characterized in that 'the filter (18) is a soda-lime template. 409883/0623