EP2628225A2

EP2628225A2 - Local network station

Info

Publication number: EP2628225A2
Application number: EP11771073.1A
Authority: EP
Inventors: Jürgen Riemenschneider; Bernd SCHÜPFERLING; Helmut Späck; Stefan Hohmann; Robert Klaffus; Bruno Opitsch; Roland STÜTZER
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2010-10-15
Filing date: 2011-10-11
Publication date: 2013-08-21
Also published as: WO2012049151A3; WO2012049151A2; DE102010042502A1

Abstract

The invention relates, amongst others, to a local network station (50-58). According to the invention, the local network station comprises an internal data bus (230), to which a central communication device (240) of the local network station and at least one sensor and at least one actuator are connected by means of a respective data bus interface, the central communication device is suited to receive an operating state signal of the at least one sensor via the internal data bus and forward same to an external control device via an external communication system, and the central communication device is further suited to receive control commands of the external control device via the external communication system and to forward same to the at least one actuator via the internal data bus.

Description

The invention relates to a local network station with the features according to the preamble of patent claim 1. The term "medium voltage" below stresses in a range between 1 KV and 52 KV and under the term "low voltage" voltages in a range between 200 V and 1 KV understood.

Ortnetzstationen the secondary distribution level consist essentially of a medium voltage switchgear, a

Transformer and a low-voltage distribution device. The local network stations are usually operated in the secondary distribution network in an open ring. Short-circuit indicators are usually used to detect faults in the secondary distribution network. In the case of an error, the fault is manually searched for by the maintenance of the affected local network stations by maintenance personnel. If the fault is localized, the respectively required switching operations must be carried out manually in order to separate the faulty section from the power distribution network. This procedure is very time consuming.

Until a few years ago, the direction of energy flow in local loop stations was always clear, from generator to generator

Consumer. The increasing number of Energieeinspei ^¬ fibers of alternative energy, the energy flow in the network and thus the direction of energy flow in local network stations will not always be as clear as it used to in the future. An error that has occurred can thus be fed from two sides. This makes it more difficult to locate a fault ^location via tripped short-circuit indicators.

The invention has for its object to provide a Ortsnetzstati ^¬ on, which allows easier error handling and requires less maintenance personnel than previous location ^¬ network stations.

This object is achieved by a local network station with the features of claim 1. Advantageous embodiments of the local network station according to the invention are specified in subclaims.

Thereafter, the invention provides that the Ortsnetzsta- tion includes an internal data bus to which a central communication device of the local network station and at least one sensor and at least one actuator are each connected to a data bus interface, the central Kommu ^¬ nikationseinrichtung is suitable, an operating state signal of at least one Receive sensors via the internal data bus and forward via an external communication system to an external guide, and the central communication device is also suitable to receive control commands of the external guide via the external communication system and forward via the internal data bus to the at least one actuator.

An essential advantage of the local network station according to the invention is the very easy connectability of the sensors and actuators to the central communication device.

The internal data bus allows namely, to dispense with a indi vidual ^¬ direct connection of sensors and actuators with the central communication device and make do with the central communication device, having one inter- nal data bus. The connection of the Sen ^¬ sensors and actuators must be made only to the internal data bus, a direct connection to the central communication device is not required. Another important advantage of the local substation of the invention is that this is not an individual for each individual ^¬ nen actuator or sensor, such as bi- must have connection, but only a single data bus interface.

The provision of the internal data bus and the central communication device within the local network station also allows a particularly efficient communication ^¬ tion with the external guide, namely not all sensors and actuators themselves are connected to the external communication system and possibly synchronized by the interposition of the central communication device but only the central communication device. In addition, is possible with the central communication device comprises a bundling of the data signals within each local area network station, so that the external communication ^¬ system can be relieved.

According to a particularly preferred embodiment of the local network station is provided that the medium-voltage switchgear is modular and has at least two switchgear module, which are arranged adjacent to each other and are connected to ^¬ each other. A modular design of the medium-voltage switchgear allows industrial prefabrication and pre-testing of the individual switchgear modules; the pre ^¬-built and pre-tested switchgear modules can then be selected taking account of the respective local needs and requirements and together with little effort. Also, a simple replacement of individual switchgear modules is possible, with the remaining switchgear modules can remain untouched.

Preferably, the medium voltage switchgear is multi-phase and has per phase on a busbar, which is suitable for guiding a medium voltage and thus acted upon in the operation of the medium-voltage switchgear. In this case, the busbars preferably extend through the switchgear modules and connect the switchgear modules with each other. The busbars preferably pass through the switchgear modules in a straight line or unbent or unbent manner; In other words, they are preferably straight within the switchgear modules.

Incidentally, it is considered advantageous if each of the bus bars is segmented and has at least two bus bar segments.

Each of the busbar segments is preferably assigned in each case to a switchgear module and passes through the respectively associated switchgear module.

In the region of the outlet passages from the associated switching module - for example on the opposite side surfaces of the associated switchgear module - preferably, each of the bus bar segments each have a mechanical interface, which connecting (Example ^¬ example by screwing, plugging, etc.) with a bus bar segment of the same busbar one Benach ^¬ disclosed switchgear module allows.

Particularly preferably, the medium-voltage switchgear on at least two switchgear modules, which are immediately adjoining be and be interconnected by two interconnected collection ^¬ rail segments. For example, a switchgear module accommodates a first ring cable switching field, which is intended for the input-side connection of the ring cable of the medium-voltage network. Another switchgear module preferably receives a second ring cable switching field, which is intended for the output side connection of the ring cable. Another (eg third) Schaltanl gene module preferably receives a transformer panel for connection to the transformer. The arrangement of the switchgear module with each other is arbitrary.

The ring cable of the medium-voltage network is preferably connected to the busbars of the medium-voltage switchgear ^¬ . The busbars preferably form at least one Be ^¬ part of the internal data bus; This makes it possible to use the busbars at least for data transmission between the switchgear modules.

The data bus, which may be for example a Stati ^¬ onsbus, preferably works according to a Modbus protocol, particularly preferably for a RTU Modbus protocol.

The at least one sensor is preferably adapted to detect an operating state of at least one component of the Ortsnetzstati ^¬ on to generate a mode signal which describes the operating state of at least one component of the local ^¬ network station, and the operation status signal at its data bus for transmission to the external communication system and output the external routing device. The at least one actuator is preferably suitable for receiving control commands via the external communication system and the internal data bus from the external routing device at its data bus interface and for changing the switching position of a switch of the local network station itself or for having it changed via an auxiliary device in response to a received control command ,

The medium-voltage switchgear preferably has at least three switching fields, namely a first ring cable switch panel for input-side connection of the ring cable of the medium-voltage network, a second ring cable switch panel for output side connection of the ring cable and a transformer panel for connection to the transformer. Each of the three switching fields is preferably arranged in a separate switchgear module.

The local network station, as described above in various embodiments, makes it possible to influence their operation from a distance or centrally. Become at- For example, all important components of the local network station are equipped with sensors and actuators, so it is readily possible to influence the load flow in the network by a corresponding control of the actuators. Such a load flow control will become more and more important as the number of alternative energy feeders increases.

If the local network stations are operated, for example, in an open electrical ring, then the open disconnection point of the open ring can be displaced by remote control from the guide device, for example by assigning the function of the open disconnection point to a selected local network station. By displacing the separation point, it is possible, for example, to localize and unlock a faulty part of a network very quickly. In this way, all consumers can reconnect to the electrical network within a very short time.

The Ortnetzstation, preferably the Mittelspannungsschaltan- would be the Ortnetzstation preferably has one or several re ^¬ the following components:

at least one buffer battery for providing Ener ^¬ energy in case of failure of the power supply in the middle ^¬ voltage network,

- at least a GSM (Global System for Mobile Communicati ^¬ ons) and / or at least one UMTS (Universal Mobile Tele- communications System) communication module for Kommunizie ^¬ reindeer, with other local network stations and / or a higher-level external guide

at least one interface to the telephone network for communicating with other local network stations and / or a higher-level external routing device,

at least one DSL (digital subscriber line) interface for communicating with other local network stations and / or a higher-level external routing device,

at least one sensor for measuring the transformer temperature of a transformer connected to the medium-voltage switchgear, at least one fault detector,

at least one detector for detecting the switch position of a switch of the medium-voltage switchgear or of the local network station,

- At least one signal generator for generating a control signal for a transformer stage switch of the medium-voltage switchgear or Ortnetzstation.

The invention further relates to an arrangement having at least two secondary substation local substations which are operated in an open ring interconnected by a ring cable, an external communication system and an external director, the external director having at least two external communication systems Local network stations is in data connection.

With regard to the advantages of the arrangement, reference is made to the above statements in connection with the local network station according to the invention, since the advantages of the arrangement essentially correspond to those of the local network station. Only in addition, it should be mentioned that the provision of the external guide means central control, monitoring and control of the local network stations is possible without maintenance personnel must be used on site.

Preferably, the external guide means is adapted, operating state signals of the sensors of said at least two local ^¬ network stations evaluate and generate control commands for the actuators of the at least two local network stations in dependence on the respective operating states.

The invention also relates to a method for operating an arrangement with at least two Ortsnetzsta ^¬ tions of the secondary distribution level and an external guide device. According to the invention, such a method provides that operating states of the respective local network station are detected with the sensors of the two local network stations, operating state signals which determine the operating states. write, are transmitted via the internal data bus and the external communication system to the external guide, the operating state signals are evaluated and in response to the respective operating conditions control commands for the actuators of the at least two Ortsnetzsta ^¬ tions are generated.

With regard to the advantages of the method according to the invention, reference is made to the above statements in connection with the local network station according to the invention.

The invention relates moreover to a center ^¬ voltage switchgear, for example for a Ortsnetzstati ^¬ on, as described above.

According to the invention of the medium-voltage switchgear is provided with respect to the medium voltage switchgear is of modular on ^¬ and has at least two switchgear modules are arranged adjacent to each other and are connected together.

Preferably, the medium voltage switchgear is multiphase and has for each phase a bus bar, which is suitable for guiding a medium-voltage and thus beauf ^¬ beat during operation. In this case, the busbar ^¬ NEN preferably extend through the switching modules through and connect the switchgear modules.

The busbars preferably pass through the switchgear modules in a straight line, ie unbent and unbent; In other words, they are preferably straight within the switchgear modules.

Incidentally, it is considered advantageous if each of the bus bars is segmented has at least two busbar segments. Preferably, each of the bus bar segments is assigned to a switchgear module and passes through the parent to each ^¬ switchgear module.

Particularly preferably, the medium-voltage switchgear on at least two switchgear modules, which are immediately adjacent b and communicate with each other by two interconnected busbar segments.

Preferably, a switchgear module receives a first ring cable switch panel, which is suitable for the input-side connection of a ring cable of a medium-voltage network. A white ^¬ teres switchgear module preferably takes a second ring on cable panel, which is intended to output-side terminal of the ring-cable. Another switching module preferably takes a transformer panel for connection to a Trans ^¬ formator.

The busbars preferably form at least one Be ^¬ part of an internal data bus; This makes it possible to use the busbars at least for data transmission between the switchgear modules.

The invention will be explained in more detail with reference to Ausführungsbeispie ^¬ len; thereby show by way of example

Figure 1 shows an embodiment of an arrangement with egg ^¬ ner variety of local network stations, via a Ring cables are connected together in an open ring,

2 shows the arrangement according to FIG 1, after the local network stations are ^¬ been joined to an external communication system, and this to an external guide,

FIG. 3 shows an exemplary embodiment of the local network stations according to FIG. 2 in a detailed representation,

4 shows an exemplary embodiment of a modular aufgebau ^¬ th medium-voltage switchgear, and

Figure 5 shows another embodiment of a modular medium-voltage switchgear.

For the sake of clarity, the same reference numbers are always used in the figures for identical or comparable components.

FIG. 1 shows a high-voltage network 10, which is connected via a power transformer 20 to a medium-voltage network 30. Connected to the medium-voltage network 30 is a ring cable 40 which connects local network stations 50 to 58 with one another to form an open ring 45. The separation point T of the open ring 45 is formed in the representation of Figure 1 by the local network station 54. In the arrangement according to FIG. 1, a wind power plant 70 which comprises three wind wheels 71, 72 and 73 is connected to a low-voltage side connection 52a of the local network station 52 via a transformer 60. The wind power plant 70 generates electrical energy, which is fed via the low-voltage connection 52a of the local network station 52 into the ring cable 40 and thus into the medium-voltage network 30. In the figure 1, the local network stations 50 and 51 are representative of the other local network stations shown in more detail. It can be seen that the two Ortsnetzstati ^¬ ones 50 and 51 each having a medium-voltage switchgear assembly 90 for connection to the ring terminal 40 of the medium-voltage network 30th To the medium voltage switchgear 90, a transformer 91 is connected via a switch 91, which converts the lying in a range between 1 kV and 50 kV medium voltage of the medium voltage network 30 in a suitable end user or end user low voltage of, for example, 220 V per phase.

To the transformer 92, a low-voltage distribution device 93 is connected, which has a plurality of terminals for outputting the low voltage of the transformer 92 ^¬ .

FIG. 2 shows the arrangement according to FIG. 1 after the local network stations 50 to 58 have been connected to an external guide 110 via an external communication system 100. The external guide device 110 is such designed from ^¬ that it evaluates the operating state signals BS of Senso ^¬ ren the local network stations 50 to 58 and as a function of the respective operating states of the local network stations control commands ST for actuators which are located within the local area network stations. In this way, the external guide device 110 is able to control the Ortnetzsta ^¬ tions 50 to 58, to monitor and control and to keep as low as possible the error effects in case of an error.

For example, the fabric ^¬ te by the local area network station 54 separation point can be displaced in the event of a failure F, to locate the fault point F in the ring terminal 40 and subsequently to prevent feeding the fault point F from both sides. In the event of a fault, the separation point T is preferably displaced as close as possible to the fault location F by replacing the local network station 54 with one of the fault locations F. telbar adjacent local network stations 51 or 52 is used as the separation point T.

In contrast to previously known local network stations, in the event of a fault it is thus not necessary to send maintenance personnel to the respective local network stations in order to carry out switching operations on site and to reconfigure the ring network formed by the ring cable 40 and the local network stations 50 to 58.

In order to allow a corresponding influence on the local network stations 50 to 58, they are equipped with a large number of sensors and actuators. FIG. 3 shows an exemplary embodiment of a local network station equipped with actuators and sensors, by way of example in greater detail.

In Figure 3 can be seen the medium voltage switchgear 90, which is equipped with three Schaltfeidern, namely ei ^¬ nem first ring cable panel 90a to the input-side terminal of the ring-cable 40 of the medium-voltage network 30 (see FIGS. 1 and 2), a second ring-panel 90b to the output-side terminal of the Ring cable 40 and a transformer ^¬ switching panel 90c for connection to the switch 91 and thus the transformer 92nd

In addition, it can be seen that the medium voltage switchgear 90 is equipped with two actuators 200 and 201, which act on switches 90d and 90e of the medium voltage switchgear 90. The actuators 200 and 201 make it possible to turn on or off the respectively associated switch 90d or 90e.

The medium-voltage switchgear 90 pipeline comprises two sensors 220 and 221 90b measure the current in the first ring cable panel 90a and the second ring-switching field, generate corresponding operating state signals BS and feed it into egg ^¬ related internal data bus 230 of the local network station. The sensors are each equipped with a data bus interface K equipped by means of which they can be connected directly to the internal data bus 230 and thus indirectly via the external communication system 100 with the external guide 110 (see Figure 2).

220 and 221, other sensors 222, 223, 224, 225 and 226 in addition to the two above-mentioned sensors are connected, which are arranged in front of the transformer 92 and in the low Spannungsverteileinrichtung 93 - are attached to the internal data bus 230 - via corresponding data ^¬ bus interfaces.

Said two actuators 200 and 201 and a further actuator 202 also connected - are connected to the internal data bus 230 - via corresponding Since ^¬ tenbusschnittstellen. The actuator 202 is designed to turn on or off the switch 91 of the local network station.

In addition, a central communication device 240 of the local network station is connected to the internal data bus 230. The central communication device 240 has the task of connecting the actuators 200 to 202 and the sensors 220 to 226 of the local network station indirectly to the external communication system 100 according to FIG. For this purpose, the central communication device 240 is configured such that they BS of the sensors 220 to 226 receives the operating state signals via the internal data bus 230 from the sensors and fed into the external communication system 100 for the purpose of Weiterlei ^¬ tung to the director 110th The central communication device 240 is also intended to receive control commands ST generated by the external routing ^¬ device 110 according to Figure 2 and transmitted over the external communication system 100 to the local area network station, and via the internal data bus 230 to an associated actuator 200 to 202 forward.

The internal data bus 230 is preferably a station bus or a bus which after a Modbus Protocol such as the RTU (Remote Terminal Unit), ASCII or TCP protocol works.

The external communication system 100, as shown in Figure 2 can be wired and example ^¬, be formed by the telephone network. Alternatively, the external communication system 100 may also be formed by a radio transmission system in which data or signals are transmitted via radio.

4 shows exemplary components of an exporting ^¬ approximately example of a modular medium-voltage switchgear ^¬ 90, as it can be used for example in the Ortsnetzsta ^¬ functions 50-58 shown in FIGS. 1 and 2

It can be seen in the figure 4, three switching modules 300, 305 and 310 which are adjacent side by side (preferably in the same plane ^¬) are arranged and three to the medium voltage network connectable busbars 315, 320 and 325 are connected to each other.

The left in the figure 4 switchgear module 300 may play the first ring-panel 90a form at ^¬ according to FIG 3 to the input-side terminal of the ring-cable of medium voltage network.

The middle in the figure 4 switchgear module 305 may play the second ring-panel 90b form at ^¬ according to FIG 3 to the output-side terminal of the ring-cable.

In the right in Figure 4 switchgear module 310, for example, the communication device 240 according to Figure 3, three to the busbars 315, 320 and 325 connected voltage converters 330, 331 and 332 and a backup battery 340 included. A transformer switch panel (see reference numeral 90c in FIG. 3) for connection to a transformer can be contained, for example, in a fourth switchgear module which is connected to the right of the switchgear module 310. This fourth switchgear module is not shown in FIG. 4 for reasons of clarity.

It can also be seen that the busbars 315, 320 and 325 are each segmented and formed by busbar ^¬ nensegmente, which are each spatially associated with a switching ^{¬ system} module and passed through this associated switchgear module. The connection of bus bar segments to one another can be ensured by Schraubele ^¬ elements as they are presented in the Figure 4 by the reference numeral 350th

In FIG. 4, to illustrate the segmentation, two of the busbar segments belonging to or forming the rear busbar 325 in FIG. 4 are identified by the reference numerals 325a and 325b.

FIG. 4 shows that the right busbar segment 325b on the left-hand module side 310a and on the right-hand module side 310b each have an interface or a segment connection to which busbar segments can be connected to the busbar segment 325b on the left and right. The busbar segment connected on the left in FIG. 4 bears the reference numeral 325a.

In the figure 4 it can be seen that the bus bars formed by the busbar segments extend through the switchgear modules and connect said distributive device ^¬ gene modules together. The busbars pass through the switchgear modules preferably straight or un ^¬ curved.

The busbars preferably form a component of the internal data bus 230 used for data transmission in accordance with FIG 3. The data transmission via the busbars can be achieved, for example, by feeding in a high-frequency data signal (signal frequency, for example, between 1 kHz and 1 MHZ, for example according to the principle of the so-called "power line carrier" (compared to the frequency of the medium voltage). ) into the busbars.

Figure 5 shows an example of parts of another exporting ^¬ approximately example of a modular medium-voltage switchgear 90, as it can be used for example in the Ortsnetzsta ^¬ functions 50-58 shown in FIGS. 1 and 2

It can be seen in Figure 5 three switchgear modules 300, 305 and 310, which are adjacent to each other and are connected to each other via one busbar 400 per phase. The busbars 400 are each formed by busbar segments 401, 402 and 403, each having two interfaces A for connection to an adjacent busbar segment.

The left in the figure 5 switchgear module 300 may play voltage network form at ^¬ the first ring-panel 90a as shown in FIG 3 to the input-side terminal of the ring-cable of medium-.

The right in the figure 5 switchgear module 310 may play the second ring-panel 90b form at ^¬ according to FIG 3 to the output-side terminal of the ring-cable.

In the central switchgear module 305 in FIG. 5, the communication device 240 according to FIG. 3 and a buffer battery 340 are included, for example. The Kommunikati ^¬ onseinrichtung 240 may, for example, a control device 241 and signal transmission means 242 have to be connected to a data bus. Other components of the switchgear module 305 are not shown for Green ^¬ to the table in Figure 5; while there may be one or more of the following compo ^¬ nents example :: a GSM (Global System for Mobile Communi- cations) and / or at least one UMTS (Universal Mobile Telecom munications System) communication module for communicating with other local network stations and / or a higher-level external routing device, an interface to the telephone network for communicating with other local area network stations and / or a higher-order external routing device, a DSL (Digital Subscriber Line) interface for communicating with other local area network stations and / or a higher-order external routing device, an error detector , a detector for detecting the switch position of a switch of the medium-voltage switchgear or of the local network station, a signal generator for generating a control signal for a transformer stage switch of the medium-voltage switchgear or the Ortnetzsta ^¬ tion. The data bus 230 shown in Figure 3 can be entirely or partially formed of his medium voltage switchgear ^¬ 90 according to Figure 5 by the bus bars 400 and through the respective busbar segments 401, 402 and 403rd Alternatively, the data bus 230 may be formed in accordance with Figure 3 by other lines 420 (for example electrical signal cables or optical fiber), which establish a connection between the switching modules 300, 305, and 310 at interface of ^¬ B len.

It is also possible to use two data buses to connect the

Use switchgear modules 300, 305 and 310. Such an embodiment is shown by way of example in FIG. A first data bus 230a is on the bus bars 400 or on the respective busbar segments 401, 402 and 403 are formed and the interfaces A and a second data bus 230b is via the lines 420 and the interface ^¬ B formed. A further interface C of the signal transmission device 242 of the communication device 240 can be used, for example, for connection to a higher-level guide device.

Although the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited to the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Reference sign list

10 high voltage network

20 power transformer

30 medium-voltage network

40 ring cables

45 open ring

50-58 local network stations

52a low voltage connection

60 transformer

70 wind turbine

71 wind turbine

72 wind turbine

73 wind turbine

90 medium voltage switchgear

90a ring cable panel

90b ring cable panel

90c transformer panel

90d switch

90e switch

91 switch

92 transformer

93 low-voltage distribution device

100 communication system

110 guide

200 actuator

201 actuator

202 actuator

220-226 sensors

230 data bus

230a first data bus

230b second data bus

240 communication device

241 control device

242 signal transmission device

300 switchgear module

305 switchgear module

310 switchgear module 310a left module side

310b right module side

315 busbar

320 busbar

325 busbar

325a busbar segment

325b busbar segment

330 voltage transformers

331 voltage transformers

332 voltage transformers

340 backup battery

350 screw element

400 busbar

401 busbar segment 402 busbar segment

403 busbar segment

420 line

A interface

B interface

C interface

BS operating status signals

ST control commands

F fault location

K data bus interface

M switch drive

T separation point

Claims

claims

1st local network station (50-58) with

- a medium-voltage switchgear (90) for connection to a ring terminal (40) of a medium-voltage network (30) is open ^¬ suitable,

a transformer (92) connected directly or indirectly to the medium-voltage switchgear for transforming the medium voltage into a low voltage and a low-voltage distribution device (93) which is connected directly or indirectly to the secondary side of the transformer and has at least two terminals for outputting the low voltage,

d a d u r c h e c e n c i n e s that

- the local network station includes an internal data bus (230) to which a central communication device (240) of the local network station and at least one sensor and at least one actuator in each case with a data bus is included ^¬ are

the central communication device is adapted to receive an operating state signal of the at least one sensor via the internal data bus and to forward it to an external guide device via an external communication system, and

- The central communication device is also suitable to receive control commands of the external guide via the external communication system and ^{weiterzulei ¬} th on the internal data bus to the at least one actuator.

2. local network station according to claim 1,

d a d u r c h e c e n c i n e s that

the medium voltage switchgear (90) has a modular structure and at least two switchgear modules (300, 305, 310) comprises up, which are arranged adjacent to each other and mitein ^¬ other are connected.

3. local network station according to claim 2, characterized in that

- The medium-voltage switchgear (90) is multi-phase and per phase has a bus bar (315, 320, 325), which is suitable for carrying a medium voltage, and

- The busbars (315, 320, 325) through the switchgear modules (300, 305, 310) extend therethrough and the switchgear modules (300, 305, 310) interconnect.

4. local network station according to claim 2 or 3,

d a d u r c h e c e n c i n e s that

each of the busbars (315, 320, 325) is segmented and has at least two busbar segments (325a, 325b),

wherein each of the busbar segments (325a, 325b) is assigned to a switchgear module (300, 305, 310) and passes through an associated switchgear module (300, 305, 310) and in the region of the exit points from the associated switchgear module (300, 305, 310) each having a mechanical interface connecting to a busbar segment (325a, 325b) thereof

Busbar (315, 320, 325) of an adjacent switchgear module (300, 305, 310) allows.

5. local network station according to claim 4,

d a d u r c h e c e n c i n e s that

the medium voltage switchgear least two distributive device ^¬ gene modules (300, 305, 310) which are immediately adjacent and (325b 325a) are interconnected by two busbar ^¬ nensegmente each other.

6. local network station according to one of the preceding claims 3- 5,

d a d u r c h e c e n c i n e s that

the bus bars (315, 320, 325) at least a part of the constituents forming the internal data bus and at least also to Da ^¬ tenübertragung between the switchgear modules (300, 305, 310) are used.

7. local network station according to one of the preceding claims, d a d u r c h e c e n e z e i c h e n e, that

the data bus operates according to a Modbus protocol.

8. local network station according to one of the preceding claims, d a d u r c h e c e n e c i n e t that

the medium voltage switchgear comprises at least three panels, namely a first ring-panel (90a) voltage network to the input side terminal of the ring-cable of medium-, a second ring-switching field (90b) for output-side terminal of the ring-cable and a transformer circuit ^¬ field (90c) for connection to the transformer ,

9. Arrangement with at least two local network stations (50-58) of the secondary distribution level, which are connected via a ring cable (40) connected to each other in an open ring (45) and are designed according to one of the preceding claims, an external communication system (100) and an external guide device (110), wherein the external guide device is in data communication with the at least two local network stations via the external communication system.

10. Arrangement according to claim 9,

d a d u r c h e c e n c i n e s that

the external guide means is suitable operating state signals (BS) to evaluate the sensors of the at least two Ortsnetzstatio ^¬ nen and depending operating states of the respective loading control commands (ST) to be generated for the actuators of the at least two local network stations.

11. A method of operating an assembly according to claim 9 or 10, wherein in the method,

operating states of the respective local network station are detected with the sensors of the two local network stations,

- operating condition signals (BS), which be ^¬ write the operating conditions are transmitted via the internal data bus and the external communication system to the external guide, and - the operating condition signals are evaluated and in dependence from ^¬ from the respective operating states of control commands (ST) are generated for the actuators of the at least two Ortsnetzsta ^¬ functions.

12. Medium-voltage switchgear, for example, for a local network station, in particular a local network station according to one of the preceding claims 1-8,

d a d u r c h e c e n c i n e s that

the medium voltage switchgear (90) has a modular structure and at least two switchgear modules (300, 305, 310) has ^¬ which are arranged adjacent to each other and mitein ^¬ other are connected.

13. Medium voltage switchgear according to claim 12,

d a d u r c h e c e n c i n e s that

- The medium-voltage switchgear is multi-phase and pro

Phase has a busbar (315, 320, 325), which is suitable for guiding a medium voltage, and

14. A local network station according to claim 12 or 13,

d a d u r c h e c e n c i n e s that

- Each of the busbar segments (325a, 325b) in each case through an associated switchgear module (300, 305, 310) and in the region of the exit points from the associated switchgear module (300, 305, 310) each having a mechanical interface, which connects to a busbar segment (325a, 325b) of an adjacent switchgear module (300, 305, 310).

15. A local network station according to claim 14,

characterized in that the medium-voltage switchgear at least two Schaltanla ^¬ gene modules (300, 305, 310), which are immediately adjacent and by two interconnected busbar gene segments (325a, 325b) communicate with each other.