DE2401531A1 - Sunken prefabricated-concrete-component for MV substation - with upwards-open box-type base, two above-ground chambers and roof - Google Patents

Abstract

The sub station, assembled from prefabricated concrete components, is designed for sinking into the ground with minimal height exposed above ground, to provide protection of the power lead components against dirt and damp, and with easily interchangeable components. The concrete housing comprises a pref. monolithic base unit with a box part open at the top, to accommodate the transformer, and shaped to serve as an oil-collecting vat. On the long side of this there is a chamber above ground for the m.v. equipment and connections, and on the short side it is fronted by a chamber for the power distributor housing. A roof element of reinforced concrete or fibreglass-reinforced plastic is provided on top. In the cable compartment each chamber is fronted by concrete or plastic shaft-cover plates.

Description

Medium-voltage network station made of precast concrete parts that can be lowered into the ground in low-profile construction The invention relates to a medium-voltage network station made of precast concrete parts in low construction, which by lowering into the ground to different underground heights, a minimum of 80 cm.

Another feature is that it is maintenance-free due to its insensitivity of the live parts against dirt and moisture. The building blocks of the and low voltage distribution, as well as the transformer, are considered closed All in all, units with detachable connections can be easily exchanged. The built-in Devices can also be adapted to the respective purpose of the station and are easy to replace eln.

The installation of network stations in metropolitan areas requires a compact, inconspicuous design that does not block the view even in busy places with special needs. A construction volume of less than 5 m3 and a low construction height facilitates this List, as in most countries there is no building permit or building notice for this is required and at street corners in the so-called '' view triangle'l partly construction heights a maximum of 80 cm must be prescribed.

Small stations made of sheet steel or plastic with prefabricated foundations are known, However, this is the case with the most frequently required equipment with transformers up to 630 kVA Exceed 5 m3 above floor volume.

A greater height above floor level and the volume are thereby due to the arrangement given the devices. A low above floor height could indeed be achieved with a so-called "Low station" can be reached, but the volume above ground is more than 5 m3.

The invention is based on the object of meeting the above requirements to meet variable requirements and a minimal above floor height with minimal above floor volume to reach.

This object is achieved according to the invention in that the concrete housing from a, preferably monolithic lower part 1 with a box-shaped one that is open at the top Part consists of accommodating the transformer 5 and as an oil collecting pan is formed, which on the long side a chamber for the housing 6 of the medium-voltage devices including their connections and on the narrow side a chamber for the housing 7 of the Low-voltage distribution is in front, and that on four limited areas the corner points a roof element made of Stahibcton 2a is attached, un that each chamber in the cable part Schachtdbdeckplatten 3 made of concrete ruder plastic are provided. -The advantages achieved with the invention are in particular in the following: Under normal conditions, the station is buried approx. 1.0 m deep, although it still remains below the floor volume of 5 m3, the normal view does not handicapped and can still be operated comfortably in an upright position. For the lineup is only the normal cable trench to expand and deepen and a Smooth the sand bed. If it is required to be set up in a triangular view, then the station is only buried a little deeper (approx. L, 5 m), so that the height above ground level 80 cm carried. Operation is then still possible in a slightly stooped position.

The station can meet the respective requirements of Netzau:; biius easy be adjusted. It can e.g. on the medium voltage side cils so-called "single station" Only with brackets attached to supports or with fuse bases Inserted tubular plug connections, both exchangeable when de-energized, be equipped. But there can also be a switch-disconnector in each cable entry or exit compact design (e.g. push switch or rotary switch disconnector), for the transformer outlet with adjacent high-voltage fuses that make the transformer switch three-pole trigger, be arranged.

The total height of the station can be increased if transformers are used without expansion vessel (with nitrogen cushion or expansion compensation through appropriate Design of the cooling belt) can alternatively be reduced by approx. 30 - 40 cm. For this only the upper half of the housing has to be changed.

In the following the invention is based on only one embodiment Illustrative drawing explained in more detail.

FIG. 1 shows an embodiment of the network station in horizontal section Figure 2 is a longitudinal section through the network station according to Figure 1 Figure 3 is a cross section through the network station according to Figure 1 in the direction of view A - A Figure 4 a partially Front view of the network station according to Figure 1, with the left outer door and in part the protective door and the cover of the cable connection part have also been omitted Figure 5 shows a cross section through the medium voltage part with detail of the roof fastening FIG. 6 shows a cross section through the low-voltage part Figure 7 a front view of the medium-voltage housing without doors, front cable cover plate and bottom part FIG. 8 shows a side view and a bottom view of the medium-voltage housing FIG. 9 bottom view of the Xabel tunnel with the 4 side views.

Inside the figures will be a fully equipped network station made of precast concrete parts with exchangeable medium and low voltage housing as well as cable tunnel elements shown for pressure relief.

The station housing consists of the monolithic lower part 1, the Roof element 2, which rests on the lower part of the housing at points 4 (this roof element can also consist of a plastic shell provided with cross ribs 2a (Fig. 6)), as well as the manhole cover plates 3. (In the box-shaped Part of the transformer 5 is housed). In the one on the long and narrow side upstream shafts is the medium-voltage housing 6 and the low-voltage housing 7, both of which are completely closed, are used.

The station is ventilated, as shown in FIG the further invention so that for ventilation on one aboveground narrow side in the concrete housing part 1, a ventilation grille 10 is used that on the other narrow side in the low-voltage housing 7 in the doors ventilation slots 11 and through the housing an air duct 12 are arranged, and that from here supplied cooling air with the help of guide plates 13 made of galvanized sheet metal or plastic is led under the transformer; and that the guide plates for ventilation 13 form a duct at the level of the upper half of the ventilation grille 10, and that recesses on the lower part of the roof element have a ventilation gap 14 along the lower edge of the roof, which is poke-proof thanks to an inserted angle profile is made.

For this purpose, the following is explained with reference to FIG. 2: For ventilation of the transformer serves a poke-proof ventilation grille 10, as well as ventilation slots 11 and air duct 12 in the low voltage part 7. The supply air is then with the help of air baffles 13 on both sides to under the transformer. The exhaust air can through the upper Half of the ventilation grille 10, as well as through air gaps 14 under the roof edges escape between the support points. This air gap is through one at all Angle profile 15 inserted on 4 sides made poke-proof.

According to the further invention, the housings for the devices are designed in such a way that that the medium and low voltage devices and their connections to each other in each a cuboid, retractable and sealed against dirt and moisture Housing box (6 or 7) made of corrosion-resistant sheet steel or plastic are housed, which is suspended from above in an angle rail 15 and screwed and the rear wall is supported on the partition wall to the transformer room, where it is screwed via a C-profile 28. For this purpose, the following is explained with reference to FIGS. 1 and 5: The medium voltage part consists of a retractable 2-part box housing 6, made of galvanized sheet steel or plastic, possibly with an external guide layer. That The upper part of the housing, arranged side by side, accommodates the high-voltage switchgear, Fuses or connecting straps, as well as their connection with each other.

As can be seen from Figure 5, the top of the housing is in an angle profile 15 hung and screwed to this from the inside. With the rear lower edge If the housing rests on the partition wall to the transformer and with the help of a recessed C-profile 28 screwed.

The cable connection is designed according to the further invention, that the respective cable feeds and their terminations in a further, front and side tapering and also sealed housing (19, 42; Fib. 3-5) are housed, which are flanged under the device housing (6 or 7) is, or that the housing box is made in one piece so that it is cuboid Upper part the devices and in the downwardly tapering lower part (19, 46; Fig. 7) the Includes cable connection. The following is explained with reference to FIGS. 3-5 and 7-8: The medium-voltage housing 6 can consist of 2 parts, namely device and cable connection part, the cable connection part is pushed and screwed under the device box with the help of sealing strips. In other cases it can also be useful, as shown in Figures 7 and 8, to choose a common housing to accommodate devices and cable connection. In both cases, both the device part and the cable connection area are against Ingress of dirt and moisture sealed to make the station maintenance-free close. In both cases, the lower cross bar 26 of the device part and the front plate 19 and the bottom piece 27 are designed to be removable in order to facilitate the connection to facilitate the cable.

According to the further invention, the closures of the housings are designed in such a way that that the front of the device housing has a door 30 knocking into sealing strips 29, The lower sealing strip can be removed to facilitate the cable connection and that the cable has a removable front panel for the same purpose 19 owns. In addition, according to the further invention, the medium-voltage device housing 6 apart from the outer door 30 which can be locked with a safety lock, there is one close behind it Protective door 31 made of corrosion-resistant sheet steel, with viewing windows 32 for observation the switching position, openings 33 for the operating crank and with sash locks is provided.

4 and 5 thus show: The upper part of the housing is through two doors 30 which hit a sealing frame 29 locked. The lower transverse web 26 of this frame and the front plate 19 of the cable connection part and the base 27 with the cable bushings can be removed after loosening wing screws in order to facilitate the connection of the cables. Behind these doors there is another protective door 31, not shown, made of galvanized sheet metal and closed with sash fasteners, with viewing windows 32 for safe observation of the switching status and openings 33 for the passage of the hexagonal profile welded onto the switch actuating shaft 34.

The equipment of the housing with the devices is according to the further invention so that the medium-voltage devices 37 and fuses 38 in a compact, open design, for example as a push switch, arranged side by side, by means of C-profiles 39 attached to the rear wall of the housing and by single-conductor plastic cables 43, 40 with each other are connected. According to the further invention, the switch is actuated via a shaft 34 with a slip-on crank, which runs horizontally above the switch 37, and further via a ball joint 36 and an adjustable, perpendicular one Linkage 35.

According to the further invention, power is supplied from the transformer 5 zxm medium and low voltage part 6 or 7 via shielded single-core cable 42 with connectors 8 and 9, which are connected to corresponding bushings on both sides in the Transformer cover and are plugged into the rear walls of the device housing.

This is shown in Fig. 1, 4-8: In the upper left half of the Housing rear wall three bushings 41 are provided within the housing Carry the upper lower part of the three high-voltage fuses 38 and lead to the transformer room continue towards in three flexible single-conductor cables 42 with angled connectors 8. This creates a pluggable, tight, externally earthed connection to the high-voltage bushings of the transformer. The normal, open design, but more compact Arrangement 1 provided switching devices (e.g. push switch) are on two C-profiles 39 attached next to each other on the rear wall and over the upper terminal lugs with Single conductor cable pieces 43 connected to one another. You will have a shaft 34 with attached hexagon, which is guided on the upper door frame and in the rear wall is operated by means of a crank. The shaft transmits the switching movement via an adjustable Linkage 35 with ball joint 36 on switching device 37. For safe operation there are two more doors behind the two doors that can be locked with a security lock Protective doors with viewing window and openings for the actuating shafts are provided. For equipping a so-called single station, instead of the switching devices Medium-voltage insulators are attached to the C-profiles, the connecting straps wear. The equipment is also variable in other respects. For example, the transformer only over Fuses or only via a switch-disconnector without Fuses are connected. In these cases, a further stub exit be accommodated.

Incoming and outgoing cables are attached to a cable holding rail, not shown, which are adjustably attached to two C-profiles 45 of the cable connection housing 46, attached.

As can be seen from Figure 8, there are various knockout openings 46 prepared in the base plate 27, de make it possible, alternatively, cables of different Make cross-sections and design, in particular single-core cables, watertight. A collar provided for this purpose is then covered with permanently elastic cement or a potting compound filled out.

The low voltage part is also in a closed hot-dip galvanized Sheet steel housing 7 housed. As a rule, it contains: A supply line power or switch disconnectors, as well as circuit screwed onto busbars for up to 8 low voltage outlets. The case is also with two around it sealed lockable doors. These doors have ventilation slots in the lower part 11 for the supply air of the transformer. This is done with the help of two plastic air shafts 12 through the low voltage compartment and with the help of guide plates 13 in the transformer room passed under the transformer.

In the upper right corner of the housing is the supply cable from Low-voltage connection of the transformer at the level of the upper connection of the supply line switch passed through the rear wall by means of a screw connection. There will be one here too shielded cable with plug chosen to the transformer room in all parts to keep insensitive to moisture and dirt.

The same is located under the low-voltage distribution housing As in the medium-voltage part, a cable connection housing that is either attached can be or forms a part with the rest of the housing. The front with the Threshold strip of the door frame and the bottom part, all alternatively from one part, are removable.

The cables are through the bottom part 27 with the aid of screw connections passed through tightly. The housing as a whole can be pushed into the concrete housing designed. It is embedded in the wall of the transformer housing on the back C-profiles screwed and hung in an angle profile above the door frame.

In the event of arcing faults occurring in the medium-voltage part the pressure relief downwards according to the further invention is designed so that the front plates 19 of the cable connection housing contain predetermined breaking points, so that they can open against the manhole cover 3 and / or that a relief space in front of the cable ducts along the cable route through tunnel elements 16 in front of them is created.

The pressure relief upwards is designed so that the upper housing cover plate Contains 46 predetermined breaking points, and that the station roof with the help of guide bolts (21, Fib. 5) has so much freedom of movement that the lubrication gap 14 passes through Raising the roof can enlarge it significantly.

This is shown in Fig. 1, 3 and 9: Serve for pressure relief prefabricated tunnel pieces (Fig. 9, Fig. 1) 16 made of prefabricated concrete, which, as from Fig. 1 can be seen in more detail, the further connection of commercially available concrete duct pieces 17, as indicated by dotted lines, allow in three directions. Openings not used are, as also indicated in FIG. 1, closed by concrete slabs 18. As can be seen from Fig. 3, the pressure equalization is downward by pressing the Front plate 19 of the cable connection space allows. The pressure wave can then without serious risk, level it along the cable route into the cable trench.

For further pressure relief via the upper housing cover plate 46 (Fig. 5) an expansion of the exhaust air gap 14 is made possible.

For this purpose, at the four corner points in the cast threaded sockets 20 (Fig. 5) screwed bolt 21, the stepped head part 22 a lifting of the roof by a few cm. For sealing against any penetrating rainwater a plastic cap 24 is used.

The threaded bushing 20 like another through bushing 23 is larger Diameter in the roof element, which serves to guide the bolt 21, are also used to screw in appropriate lifting eyes. This makes it easier erecting the station or lifting the roof, if it is made of concrete, for replacing the transformer.

Claims (13)

Expectations: Medium-voltage network station made of precast concrete parts in low-rise construction, by lowering into the ground to different above floor heights, a minimum of 80 cm can be brought to the conclusion that the concrete housing from a preferably monolithic lower part (1) with an upwardly open one there is box-shaped part that is used to accommodate the transformer (5) and as Oil drip pan is formed, a chamber for above ground on the long side the housing (6) of the medium-voltage devices including their connections, and on the narrow side a chamber for the housing (7) of the low-voltage distribution is placed in front of it, and a roof element made of reinforced concrete on four limited areas at the corner points (2) or made of glass fiber reinforced plastic with stiffening ribs (2a) is, and that each chamber in the cable part manhole cover plates (3) made of concrete or plastic are provided. 2. Station according to claim 1, d a d u r c h g e k e n n z e i c hn e t that for ventilation on one aboveground narrow side in the lower part of the concrete housing (1) a ventilation grille (10) is used that on the other narrow side in the Low-voltage housing (7) in the doors ventilation slots (11) and through the housing an air duct (12) are arranged, and that the cooling air supplied from here with With the help of guide plates (13) made of galvanized sheet metal or plastic up to under the transformer to be led. 3. Station according to claim 2, d a d u r c h g e k e n n z e i c hn e t that for ventilation the guide plates (13) one in the height of the upper half the ventilation grille (10) leading Form channel, and that recesses a ventilation gap (14) along the lower edge of the roof on the lower part of the roof element form, which is made poke-proof by an inserted angle profile. 4. Station by claim 3, d a d u r c h g e k e n n z e i c hn e t that the medium and low voltage devices and their interconnections each in a cuboid, insertable and sealed against dirt and moisture Housing boxes (6 and 7) made of corrosion-resistant steel or plastic that is hung and screwed into an angle rail (15) at the top and with the rear wall is supported on the partition wall to the transformer room, where he is screwed via a C-profile (28). 5. Station according to claim 4, d a d u r c h g e k e n n z e i c hn e t that the respective cable feeds and their terminations in a further, housing (l9, 42; Fig. 3-5), which is flanged under the device housing (6 or 7) is. 6. Station according to claim 3 or 4, d a d u r c h g e k e n n -z e i c h n e t that the housing box is made in one piece, so that it is cuboid Upper part the devices and in the downwardly tapering lower part (19, 46; Fig. 7) the Includes cable connector. 7. Station according to claim 5 or 6, d a d u r c h g e k e n n -z e i c h n e t that the device housing has a door knocking into sealing strips (29) at the front (30), the lower sealing strip to facilitate the cable connection is removable, and that the cable connection housing is removable for the same purpose Has front plate (19). 8. Station according to claim 7, d a d u r c h g e k e n n z e i c h -n e t that the medium-voltage device housing (6) apart from the one with a safety lock lockable outer door (30), a protective door (31) made of corrosion-resistant Sheet steel with inspection windows (32) for observing the switch position, Openings (33) for the actuating crank and is provided with sash locks. 9. Station according to claim 7 or 8, d a d u r c h g e k e n n -z e i c h n e t that the medium-voltage switchgear (37) and fuses (38) are in a crowded state open design, for example push switch, arranged side by side, by means of C-profiles (39) attached to the rear wall of the housing and secured by single-conductor plastic cables (43, 40) are interconnected. 10. Station according to claim 9, d a d u r c h g e k e n n z e i c h -n e t that the switch is operated via a shaft (34) with a slip-on crank, which runs horizontally above the switch (37), and further via a ball joint (36) and an adjustable, vertically extending rod (35). 11. Station according to claim 10, d a d u r c h g e k e n n z e i c h -n e t that the power supply from the transformer (5) to the medium and low voltage part (6 or 7) is carried out using shielded single-core cables (42) with connectors (8 or 9), on both sides on corresponding bushings in the transformer cover and in the Rear walls of the device housing are attached. 12. Station according to one of claims 9 to 11, d a d u r c h g ek It is noted that in the event of arcing faults occurring in the medium-voltage part for pressure relief down the front plate (19) of the cable connection housing predetermined breaking points contains so that it can open against the manhole cover, and / or that a Discharge area in front of the cable ducts along the cable route superior tunnel elements (16) is created. 13. Station according to claim 12, d a d u r c h g e k e n n z e i c hn e t that the upper housing cover plate (46) predetermined breaking points for pressure relief upwards contains, and that the station roof with the help of guide bolts (21, Fig. 5) so much The ventilation gap (14) has freedom of movement by lifting the roof can increase significantly. Blank page