Energy measuring device for a local grid substation and comprising a stored energy source

Abstract

The invention relates to an energy measuring device (10) for use in an electrical local grid substation (1), the energy measuring device comprising a first communication interface (101) for establishing a first communication connection (K1) with a local controller (S1) of the local grid substation (1) and a second communication interface (102) for establishing a second communication connection (K2) with an external controller (S2) of an energy supply grid (E) that is superordinate to the local grid substation (1). The energy measuring device (10) is designed to detect grid information relating to a local grid (O) associated with the local grid substation (1) and to transmit said information via the first communication connection (K1) to the local controller (S1) and / or via the second communication connection (K2) to the external controller (S2). The energy measuring device (10) comprises at least one internal stored energy source (100) which is designed to supply energy to components (101, 102, 104, 105 106, 107, 108, 109) of the energy measuring device (10) in the event of a grid failure of the local grid (O).

Description

[0001] ENERGY METERING DEVICE FOR DISTRIBUTORS WITH ENERGY STORAGE

[0002] The proposed solution relates to an energy meter for use in an electrical distribution substation. Furthermore, the proposed solution relates to a system comprising such an energy meter, as well as to a method for supplying network information from a local network to a higher-level power supply network using such an energy meter.

[0003] Energy meters are regularly used in electrical distribution substations to record network information, such as the electrical parameters of a downstream consumer. This can also record network information that provides information about the status of the respective local network and, for example, indicates a network disturbance such as a power outage. Network information from the respective local network recorded by the energy meter can be reported to a control system of a higher-level power supply network, for example, to ensure the supply of energy to the local network from the higher-level power supply network in the event of a power outage.

[0004] However, failures in the transmission of grid information by the energy meter can regularly occur if the meter also fails due to the grid disruption. A failure of the local grid control system, which can receive grid information recorded by the energy meter and report it to the control system of the higher-level energy supply grid, can also be problematic in the event of a grid disruption. In both cases, a continuous and reliable supply of energy to a local grid during a power outage is not guaranteed.

[0005] The task is therefore to improve the transmission of network information to a control system of an energy supply network.

[0006] This object is achieved by an article having the features of claim 1.

[0007] Accordingly, an energy meter for an electrical distribution substation comprises a first communication interface for establishing a first communication connection with a local controller of the distribution substation and a second communication interface for establishing a second communication connection with an external controller of a power supply network superordinate to the distribution substation. The energy meter is designed to acquire network information of a distribution network to which the distribution substation is assigned.

[0008] The local grid and its higher-level energy supply network are networks for the transmission and distribution of electrical energy. In particular, such networks serve to supply consumers with electrical energy.

[0009] The local grid can be a low-voltage grid. In this case, the higher-level power supply grid is, for example, a medium-voltage or high-voltage grid. However, it is also conceivable that the local grid is a medium-voltage grid. In this case, the power supply grid is, for example, a high-voltage grid. For example, the local grid has a lower operating voltage than the higher-level power supply grid.

[0010] The local network substation is designed to convert the operating voltage of the higher-level power supply network into the operating voltage of the local network. For example, if the local network is a low-voltage network and the higher-level power supply network is a medium-voltage network, the medium voltage is converted to low voltage in the local network substation.

[0011] The energy meter is configured to transmit the recorded network information via the first communication connection to the local control system and alternatively or additionally to the external control system of the higher-level energy supply network.

[0012] Several scenarios are conceivable here. For example, the energy meter can send network information acquired from the local grid via the first communication connection exclusively to the local control system of the local grid station. In this example, the local control system can then transmit the received network information to the external control system of the higher-level energy supply network via a further communication connection. However, the energy meter can also transmit acquired network information to the local control system and additionally to the external control system via a second communication connection. In this way, the external control system receives the network information acquired from the local grid by the energy meter redundantly.This ensures, in particular, that even in the event of a failure of the local control system of the local network substation, the recorded network information continues to be made available to the external control system and thus to the higher-level energy supply network. For example, during normal operation of the local network, i.e., when the local network is operating without disruptions, the recorded network information can be transmitted by the energy meter to the local control system, which can then optionally forward the network information to the external control system as described above. In addition, during normal operation of the local network, the recorded network information can be delivered directly by the energy meter to the external control system via a second, redundant communication connection.If a grid failure occurs, such as a power outage, the local control system may fail and may no longer be able to forward grid information received from the energy meter via the first communication connection. In the event of a grid failure, the energy meter's second communication interface ensures that the grid information continues to be transmitted to the external control system via at least one communication connection, in this case the second one.

[0013] The network information may include currents and / or voltages of supply lines in the local network substation.

[0014] The energy meter further comprises at least one internal energy storage device. The internal energy storage device is designed to supply (electronic) components of the energy meter with energy in the event of a grid disruption, such as a power outage, in the local grid. The internal energy storage device enables buffering of the supply to the energy meter and in particular to components of the energy meter. This ensures that the energy meter continues to be supplied with energy from its own internal energy storage device even in the event of a grid disruption. Advantageously, the energy meter can be supplied from the internal energy storage device regardless of the status of the local grid or the higher-level energy supply grid. Typically, energy meters from local grids are supplied from external energy storage devices or sources, for example, from a higher-level energy supply grid.This can sometimes lead to delays in the power supply to the energy meter. In addition, such an energy meter supplied with power does not usually receive any information about the external power supply. Accordingly, an externally supplied energy meter cannot receive or derive any information about when its own components or components of the local grid station should be switched off, for example in the event of a grid fault. An energy meter that supplies itself with power from an internal energy storage device is self-sufficient, i.e. independent of external suppliers. This ensures that grid information is transmitted not only during normal operation, but particularly in the event of a grid fault. For example, in a state in which the local grid is not being supplied with power and cannot provide any power, grid information can still be transmitted to the external control system.This is the case, for example, during an automatic reclosure of a circuit breaker in the local grid after a grid fault or after an unsuccessful reclosure of the circuit breaker. Even in these cases, the energy meter's buffering allows grid information to be transmitted to the external control system via the second communication connection.

[0015] The energy meter can be designed to transmit the recorded network information of the local network, particularly during normal operation, simultaneously via the first communication connection to the local controller and via the second communication connection to the external controller. This enables particularly reliable and secure transmission of the network information recorded by the energy meter to the external controller. By redundantly transmitting network information to the external controller via two communication connections, the transmission of network information to the external controller via the second communication connection can take place without interruption, for example in the event of a (spontaneous) failure of the local controller. In particular, this eliminates the need to switch from one communication connection to another depending on the network status.

[0016] The energy meter can be designed to be supplied with energy from the local grid. The energy meter can also be designed to be supplied with energy from at least one internal energy storage device after a grid fault in the local grid occurs. In this way, energy from the energy meter's internal energy storage device can be saved, particularly during normal operation, i.e., during fault-free operation of the local grid station. This makes it possible to use the energy from the internal energy storage device when needed, e.g., in the event of a power failure, to ensure continued supply to the energy meter and thus also the transmission of grid information to the external control system.

[0017] In one example, the energy meter comprises a plurality of internal energy storage devices. The energy meter can then be designed to be supplied with energy from at least one, in particular from one or more of the internal energy storage devices, for example after a grid fault in the local grid occurs. By way of example, the energy meter is designed to switch to a supply with energy from the at least one internal energy storage device in response to the occurrence of the grid fault in the local grid. This enables a particularly spontaneous retrieval of the energy stored in the internal energy storage device and a supply of the energy meter with particularly little time loss. In particular, the energy meter is designed to carry out the switch automatically, for example by reversing the direction of energy flow in the energy meter.In this example, after the change, the energy can flow directly from the internal energy storage to the components of the energy meter that need to be supplied.

[0018] Furthermore, the energy meter can comprise an input circuit via which the internal energy storage device can be connected to the local grid. The input circuit can comprise a diode. The diode is in particular connected such that the internal energy storage device can be supplied with energy from the local grid when the energy meter is connected to the local grid. The diode is designed to allow current to flow in only one direction, in particular only in the supply direction to the internal energy storage device from the local grid. Conversely, the diode is designed, for example, to prevent current from flowing in the opposite direction, in this case from the internal energy storage device of the energy meter into the local grid. The diode therefore ensures in particular that no energy can flow back into the local grid. The input circuit thus enables energy to be supplied from the local grid to the energy meter, in particular during normal operation of the local grid.However, it can happen that the supply of energy from the local grid fails, for example, in the event of a grid failure. In this case, it may be necessary to reserve the energy stored in the internal energy storage unit only for the most essential processes, such as the continued transmission of grid information via the second communication link to the external control system or an emergency power supply for components of the energy meter. In this case, the input circuit can ensure that no energy can be diverted from the energy storage unit to consumers or other participants in the local grid. This enables a predictable bridging time, guaranteeing the emergency continuity of the most important processes in the local grid station.

[0019] The internal energy storage device can also be configured to supply the energy meter completely or at least partially with energy, particularly depending on its storage state. If the internal energy storage device is relatively fully charged, the energy meter can be completely supplied with energy, for example, in the event of a power outage in the local grid. If the storage state is lower, it may be necessary to provide less energy to the energy meter itself in order to maintain the necessary grid processes.

[0020] The energy meter can comprise one or more electronic components. Depending on the storage status of the internal energy storage device, one or more components can be shut down as needed. This enables particularly efficient and resource-saving energy management within the energy meter and thus particularly reliable transmission of grid information to the external control system, even in the event of a fault.

[0021] Components that the energy meter can comprise are, for example, an input and / or output interface, in particular a digital input and / or output, such as a proportional energy output, such as an SO interface, an indicator light, such as a display light, an indicator, e.g. a display, an external data memory, an internal data memory and / or a (first) communication interface, in particular a bus interface. Depending on the memory state of the internal energy memory of the energy meter, these electronic components can be switched off successively or at least partially simultaneously, in particular in response to a grid fault. In particular, the plurality of components can be deactivated in (exactly) the specified order if necessary.

[0022] This makes it possible to continue supplying other components of the energy meter that are necessary for continued operation with energy from the internal energy storage device, even in the event of a grid failure. Such components can be the energy meter's second communication interface for transmitting grid information to the external controller via the second communication connection, but also a microprocessor and / or an analog-to-digital converter.

[0023] An input interface, for example in the form of a digital input, can be designed in particular to detect states of other devices, such as components of the energy meter, but also of devices of the local network station connected to the input interface. An output interface, for example in the form of a digital output, can be designed to control other devices, in particular based on values ​​exceeding or falling below determined threshold values. In one example, the first communication interface of the energy meter is designed as a bus interface. The second communication interface of the energy meter can also be designed as a bus interface. This enables particularly simple and reliable transmission of network information via the first and / or the second communication connection.

[0024] The first communication interface of the energy meter can be configured, for example, as an Ethernet interface or an RS485 interface. The second communication interface can be configured, for example, as an EtherCAT, EtherNet / IP, FID bus, Profibus, or Profinet interface.

[0025] According to one aspect, a system is provided that includes a local controller of an electrical distribution substation, an external controller of a power supply network superordinate to the distribution substation, and an energy meter according to any embodiment described herein. In this system, a first communication connection exists between the first communication interface of the energy meter and the local controller. A second communication connection exists between the second communication interface of the energy meter and the external controller. Regarding the advantages, reference is made to the above information regarding the energy meter.

[0026] The system can be configured so that the external controller receives grid information from the energy meter via the second communication connection in the event of a grid failure. This allows the grid information acquired by the energy meter to continue to be transmitted to the external controller via at least one communication connection, in this case the second communication connection, in the event of a grid failure such as a power outage.

[0027] According to a further aspect, a method is specified for supplying network information from a local network to a higher-level energy supply network by an energy meter of a local network station assigned to the local network. The energy meter comprises at least one internal energy storage device. The method comprises the following steps in any order (alternatively, in exactly the order specified): detecting network information from the local network by the energy meter; transmitting the detected network information to a local controller of the local network station via a first communication connection and / or to an external controller of the energy supply network; and, in response to detection of a network fault by the energy meter, supplying components of the energy meter with energy from the internal energy storage device of the energy meter. With regard to the advantages, reference is made to the above information on the energy meter.

[0028] For example, it is intended that the energy meter provides network information to the external control system in response to the detection of the network disturbance in the local network.

[0029] The energy meter may be constructed in any manner as described herein.

[0030] The concept underlying the invention will be explained in more detail below with reference to the exemplary embodiments illustrated in the figures. They show:

[0031] Fig. 1 a circuit diagram of a local network station with an energy meter in

[0032] Communication with a higher-level energy supply network;

[0033] Fig. 2 Processes during a network disturbance in the local network station according to Fig. 1 ;

[0034] Fig. 3 Process steps of a method for supplying network information from a local network to a higher-level energy supply network.

[0035] Fig. 1 shows a local network O for supplying consumers V with a low voltage, a local network station 1 assigned to the local network O and an external control S2 of a higher-level energy supply network E.

[0036] The local grid O and the higher-level energy supply grid E comprise several, in this case three, phases L1, L2, L3 and a neutral conductor N. These supply services are connected to transformers T1, T2. The transformers T1, T2 serve to convert the respective operating voltages. In this case, the operating voltage in the higher-level energy supply grid E is higher than in the local grid O. The first transformer T1 can, for example, convert a high voltage in the conductors L1, L2, L3, N in the higher-level energy supply grid E into a medium voltage and thus make it available to the local grid O. Analogously, the transformer T2 can convert a medium voltage in the local grid O into a low voltage. The low voltage can then be made available to corresponding consumers V in the local grid O. However, other conversions are also conceivable here. The local network station 1 comprises an energy meter 10.The energy meter 10 comprises a first communication interface 101 and a second communication interface 102. In the present case, the first and second communication interfaces 101, 102 are designed as bus interfaces.

[0037] A first communication connection K1 to a local controller S1 of the local grid can be established via the first communication interface 101, for example, during or after connecting the energy meter 10 to the local grid O. In the example shown, the energy meter 10 is already connected to the local grid O, in this case on the low-voltage side, and is connected to the local controller S1 via the first communication connection K1. The energy meter 10 can transmit grid information to the local controller S1 via the first communication connection K1.

[0038] Furthermore, in the example shown, the local controller S1 exchanges information with the external controller S2 via a further communication connection K3. In this way, network information acquired by the energy meter 10 can be transmitted via the first communication interface 101 via the first communication connection K1 not only to the local controller 101, but also further to the external controller S2.

[0039] The second communication interface 102 of the energy meter 10 serves to establish a second communication connection K2 to an external controller S2 of an energy supply network E that is higher-level than the local network O, for example, during or after connecting the energy meter to the local network O. In the example shown, the energy meter 10 is already connected to the external controller S2 via the second communication connection K2. The energy meter 10 can transmit network information to the external controller S2 via the second communication connection K2.

[0040] In this case, the second communication connection K2 extends over a greater distance than the first communication connection K1. The communication connection K2 can, for example, be a point-to-point connection between the second communication interface 102 and the external controller S2. The second communication interface 102 can, for example, comprise a gateway and, in particular, be designed as a gateway. For example, the gateway can be an integrated gateway, such as a GSM modem. However, a remote gateway is also conceivable. The gateway is designed to generate a radio network, for example, according to the LoRaWAN standard. The use of a gateway enables a communication connection with a range of up to several kilometers.

[0041] The first and second communication interfaces 101, 102 of the energy meter 10 thus allow redundant transmission of network information to the external controller S2 of the higher-level energy supply network E. Thus, the network information acquired by the energy meter 10 can be transmitted to the external controller S2 via the first and second communication connections K1, K2 as required. However, it is also conceivable, for example in order to save energy in the energy meter 10, to provide network information to the external controller S2 via only one of the two communication interfaces 101, 102, preferably via the second communication interface 102.

[0042] The provision of two communication connections K1, K2 originating from the energy meter 10 makes it possible, particularly in the event of a failure of the local control 101, as can occur in the event of a network fault in the local network O, to always provide network information to the external control S2, in this case via the second communication connection K2.

[0043] The external controller S2 is designed to use the network information to record the actual state and in particular the quality of electrical parameters, such as the voltage. The external controller S2 can then, in response to the received network information, transmit control signals X1, X2 to switches 20A, 20B assigned to the higher-level energy supply network E. Such switches 20A, 20B can, for example, be EVU-HS and EVU-MV switches, i.e. high-voltage switches and medium-voltage switches of an energy supply company. In the example shown, the first switch 20A is arranged upstream of the first transformer T1, in this case assigned to the higher-level energy supply network E. The second switch 20B is arranged, for example, between the first transformer T1 and the second transformer T2 and, in this case, is connected upstream of the local network O. Additional local networks Z can be connected between the second switch 20B and the local network O.

[0044] The local grid station 1 comprises several fuses 12. In the example shown, the fuses 12 are connected downstream of the second transformer. Network information in the form of voltage information and / or frequency information can be recorded downstream of the fuses 12. Fig. 1 shows the local grid O in the state of a grid fault. If a grid fault is detected by the external controller S2, the external controller S2 can send corresponding control signals X1, X2, in this case "open the switch" signals, to the switches 20A, 20B. In response to the control signals X1, X2, the switches 20A, 20B are opened in order to prevent the local grid O from being overloaded until the cause of the grid fault has been determined.

[0045] Similarly, the local controller S1 is configured to transmit control signals X3, particularly in response to the grid information transmitted by the energy meter 10 via the first communication interface 101, to a switch 20C of the local network substation 1. In this case, switch 20C is a utility-MV switch. The explanations for switches 20A, 20B apply analogously to switch 20C.

[0046] The energy meter 10 includes an internal energy storage device 100. The internal energy storage device 100 is designed to store energy and make it available to the energy meter 10 as needed. For this purpose, the internal energy storage device comprises, for example, a rechargeable battery and / or a capacitor. A need to release stored energy from the internal energy storage device may arise, for example, in the event of a network disruption in the local grid, such as a power outage, as explained below.

[0047] During normal operation of the local network station, i.e. when there is no grid fault, the energy meter 10 is usually supplied with energy from the local network O. In the example shown, an input circuit 103 of the energy meter 10 receives energy supplied from the local network O. For example, the input circuit 103 has a diode 110. The input circuit 103 is coupled to the internal energy storage device 100. In this way, energy supplied from the local network O via the input circuit 103 is passed on to the energy storage device 100. The energy supplied to the internal energy storage device 100 can now be stored by the latter, depending on requirements and / or its storage state, and alternatively or additionally supplied to other components of the energy meter 10. In this way, the energy meter 10 is supplied with energy during normal operation of the local network station 1.

[0048] If, for example, there is a grid fault, specifically a power outage, the energy supply from the local grid O to the energy meter 10 may fail. Then, there may be a need to provide the energy meter 10 with energy stored in its own internal energy storage device 100. In particular, this ensures the continued operation of components 106, 107, 108, 109 of the energy meter 10, such as the second communication interface 102 for transmitting grid information via the second communication connection K2 to the external controller S2. This enables the transmission of grid information to the external controller S2 even in the event of a grid fault, for example, if the local controller S1 is switched off due to a power outage and can neither receive grid information via the first communication connection K1 nor forward it to the external controller S2 via the third communication connection K3.

[0049] The energy meter 10 has several inputs 111, 112. The inputs 111, 112 are designed to read electrical parameters from the local grid O. Voltages, for example, can be read at the first input 111. Currents, for example, can be read at the second input 112. In the example shown, the local grid station 1 has current sensors 13, which serve to detect currents, in this case from connected consumers V.

[0050] The acquisition of network information in the form of current information can take place behind the second transformer T2, for example at the consumer V.

[0051] The recording of active power and / or reactive power information can be carried out at the consumer V.

[0052] The energy meter 10 has a plurality of components 101, 102, 104, 105, 106, 107, 108, 109. Such components can be, on the one hand, the first and the second communication interface 101, 102. The energy meter 10 further comprises components 106, 107, such as a microprocessor or an analog-to-digital converter, which can be particularly important for the continued operation of the energy meter 10. In the present case, the energy meter 10 further comprises an input interface in the form of a digital input 108. Furthermore, components 104, 105 can be provided, which can be, for example, an input / output interface, a display illumination, a display, an external data memory, an internal data memory, or a bus interface 101. In the example shown, the energy meter 10 further comprises a switching regulator 109, which is designed, for example, as a switched-mode power supply.In this case, the switching regulator is connected downstream of the internal energy storage device 100.

[0053] In the example shown, component 106 is an analog-to-digital converter (ADC). ADC 106 is designed to read analog signals from local network O, such as currents or voltages. As shown in Fig. 1, the analog signals can be read at inputs 111, 112. ADC 106 can then convert the analog signals into digital signals so that they can be evaluated by a microprocessor. The microprocessor is designed to determine network information from the evaluated digital signals. The network information determined in this way can then be transmitted to local controller S1 and / or external controller S2 via the respective communication connections K1, K2, K3.

[0054] The ADC 106 can also be configured to read out emergency information, in particular information that provides information about the grid status of the local grid O. Such emergency information serves in particular as indicators of deviations from normal operation and can be, for example, a grid voltage, a frequency, and / or current values. However, emergency information such as energy, in particular as an indicator of limit values ​​or overloads, the direction of energy flow (from source to load or vice versa), and / or feedback, such as can occur, for example, when the circuit breaker in the local grid station 1 is switched off and a grid voltage is present, in particular one fed back from the load, can also be read out by the ADC 106.According to the above conversion steps, such emergency information can finally be converted into network information and transmitted to the local controller S1 and / or the external controller S2 via the respective communication links K1, K2, K3.

[0055] The energy meter 10 can be configured to deactivate one or more components 104, 105 as needed, particularly depending on the storage state of the internal energy storage device 100, i.e., its energy level. Components 104, 105 are deactivated, particularly according to their priority. In one example, components 104, 105 are deactivated in (exactly) the specified order: input / output interface, display illumination, display, external data storage, internal data storage, bus interface.

[0056] This possibility of, in particular sequential, partial shutdown of components 104, 105 allows the internal energy storage 100 to supply the energy measuring device 10 with energy completely or (only) at least partially, depending on its storage state.

[0057] As already mentioned above, the energy meter 10 has an input circuit 103. This is designed to connect the energy meter 10 to the local grid O. The input circuit 103 has a diode 110. The diode 110 is designed to allow current to flow in only one direction, in this case from the local grid O to the internal energy storage device 100. The input circuit 103 thus enables the supply of energy from the local grid O to the energy meter 100, particularly during normal operation of the local grid.

[0058] Conversely, the diode 110 is designed to prevent current from flowing (back) in the opposite direction, in this case from the internal energy storage 100 of the energy meter 10 into the local grid O. This prevents any energy remaining in the internal energy storage 100, which is necessary for the continued operation of the energy meter 10, from being dissipated from the energy storage 100 for consumers V or other participants in the local grid O. This is particularly advantageous in the event of a power failure from the local grid O.

[0059] Fig. 2 schematically shows possible processes that can occur before, during and after a grid disturbance in the local network station O and the higher-level energy supply network E.

[0060] Diagram A shows the presence of a grid fault over time. In the example shown, the grid fault occurs from time t1. From time t1 to t2, an automatic reclosure of one or more circuit breakers (AR) is achieved, represented by AR+. The period between times t1 and t2 represents a circuit breaker delay. Only at time t2, in particular after successful AR, do one or more circuit breakers (e.g. breaker 20A and / or breaker 20B) switch, as illustrated in diagram B. The voltage supply to the loads is then interrupted (diagram C). The energy supply to the components of the energy meter 10 is taken over by the internal energy storage device 100 (diagram D). Shortly thereafter, the energy meter 10 sends grid information via the second communication connection K2 (diagram F).

[0061] Starting at time t3, an autoreclose is attempted again, but aborts unsuccessfully at t4, represented by autoreclose-. Starting at time t6, the grid disturbance is resolved.

[0062] The second line B shows the circuit breaker's dynamics as a function of time. The circuit breaker is active until time t2 and deactivated after the grid fault. If auto-reclose is attempted again between times t3 and t4, the circuit breaker is reactivated.

[0063] Diagram C shows the supply to components in the local network O as a function of time. This depends on the activity of the circuit breaker in the period between t1 and t2 and only returns to the initial value after the grid fault has been rectified at time t6.

[0064] During the unsuccessful AWE, the energy supply is not stable.

[0065] Diagram D shows the supply of the energy meter 10 by the internal energy storage device 100. As already described above, the need for a supply from the energy stored in the internal energy storage device 100 only arises upon the occurrence of a grid fault. As shown in Fig. 2, the supply from the internal energy storage device 100 is activated from time t2, namely in response to the occurrence of the grid fault. After the grid fault is resolved from time t6, the internal energy storage device 100 can be refilled.

[0066] Diagram F shows the transmission of network information, with network information being sent to the external controller S2 shortly after the network fault occurs, starting at time t2. Corresponding network information is also sent to the external controller after the network fault has been resolved.

[0067] Diagram G shows the control signals X1, X2 that can be sent by the external controller S2 in response to grid information, and / or the control signals X3 that can be sent by the local controller S1 in response to grid information. At time t5, control signals X1, X2, and / or X3 are transmitted to the corresponding circuit breakers 20A, 20B, and / or 20C. Once these have restored the power supply, the grid disturbance is resolved (time t6).

[0068] Fig. 3 shows method steps of a method for supplying network information of a local network O to a higher-level energy supply network E by an energy meter 10 of a local network station 1 assigned to the local network O. The method comprises:

[0069] Step P1: Detecting network information of the local network O by the energy measuring device 10. Possible network disturbances in the local network O can be detected by the energy measuring device 10.

[0070] Step P2: Transmission of the detected network information to a local controller S1 of the local network station 1 via a first communication connection K1 and / or to an external controller S2 of the energy supply network E. Depending on the state of the local network O, the network information detected by the energy meter 10 can be transmitted redundantly via the first and second communication connections K1, K2 or, for example, in the event of failure of the local controller S2 in the event of a network fault, only via the second communication connection K2 (see step P3).

[0071] Step P3: In response to detection of a grid fault by the energy meter 10, supplying components (101, 102, 103, 104, 106, 107, 108, 109) of the energy meter 10 with energy from the internal energy storage 100 of the energy meter 10. Step P3 may also include the energy meter 10 supplying grid information to the external controller S2 in response to detecting the grid fault.

[0072] List of reference symbols

[0073] 1 local network station

[0074] 10 Energy meter

[0075] 100 internal energy storage

[0076] 101 first communication interface

[0077] 102 second communication interface

[0078] 103 Input circuit

[0079] 104, 105 Component

[0080] 106, 107 Component

[0081] 108 digital input

[0082] 109 switching regulators

[0083] 110 Diode

[0084] 111 , 112 Entrance

[0085] 12 Security

[0086] 13 Current sensor

[0087] 20A, 20B, 20C switches

[0088] E higher-level energy supply network

[0089] K1 first communication connection

[0090] K2 second communication connection

[0091] K3 additional communication connection

[0092] L1, L2, L3 phases

[0093] N neutral conductor

[0094] O Local network

[0095] P1 -P3 steps of a procedure

[0096] S1 local control

[0097] S2 external control

[0098] T1, T2 transformer

[0099] V Consumer

[0100] X1, X2, X3 control signal

Claims

Patent claims 1. Energy meter (10) for an electrical distribution substation (1), the energy meter (10) comprising: - a first communication interface (101) for establishing a first communication connection (K1) with a local controller (S1) of the local network station (1), - a second communication interface (102) for establishing a second communication connection (K2) with an external controller (S2) of an energy supply network (E) superordinate to the local network station (1), wherein the energy meter (10) is designed to detect network information of a local network (O) assigned to the local network station (1) and to transmit it via the first communication connection (K1) to the local controller (S1) and / or via the second communication connection (K2) to the external controller (S2), and further comprises: - at least one internal energy storage device (100) which is designed to supply components (101, 102, 104, 105, 106, 107, 108, 109) of the energy measuring device (10) with energy in the event of a network fault in the local network (O).

2. Energy meter (10) according to claim 1, characterized in that the energy meter (10) is designed to transmit network information of the local network (O) simultaneously via the first communication connection (K1) to the local controller (S1) and via the second communication connection (K2) to the external controller (S2).

3. Energy measuring device (10) according to claim 1 or 2, characterized in that the energy measuring device (10) is designed to be supplied with energy from the local network (O) and, after the occurrence of a network fault in the local network (O), to be supplied with energy from the at least one internal energy storage device (100).

4. Energy meter (10) according to claim 3, characterized in that the energy meter (10) is designed to switch to a supply of energy from the at least one internal energy storage device (100) in response to the occurrence of the network disturbance of the local network (O).

5. Energy meter (10) according to one of the preceding claims, characterized by an input circuit (103) via which the internal energy storage device (100) is connected to the local network (O) can be connected, wherein the input circuit (103) comprises a diode (110) which is connected to supply the internal energy storage device (100) with energy from the local network (O) and to prevent a backflow of energy.

6. Energy measuring device (10) according to one of the preceding claims, characterized in that the internal energy storage device (100) is designed to supply the energy measuring device (10) completely or at least partially with energy in the event of a network fault in the local network (O), depending on its storage state.

7. Energy meter (10) according to claim 6, characterized in that the energy meter (10) comprises one or more components (101, 102, 104, 105, 106, 107, 108, 109), wherein the internal energy storage device (100) is designed to switch off one or more of the components (101, 102, 104, 105, 106, 107, 108, 109) depending on its storage state.

8. Energy meter (10) according to claim 7, characterized in that the energy meter comprises a plurality of components (101, 104, 105), wherein the plurality of components (101, 104, 105) comprise several or all of the following: an input or output interface, a display illumination, a display, an external data memory, an internal data memory and / or a bus interface (101).

9. Energy measuring device (10) according to claim 8, characterized in that, depending on the storage state of the internal energy storage device (100), the energy measuring device (10) is designed to switch off the plurality of components (101, 104, 105) in the specified order.

10. Energy measuring device (10) according to one of the preceding claims, characterized in that the first communication interface (101) and / or the second communication interface (102) is designed as a bus interface.

11. Energy measuring device (10) according to one of the preceding claims, characterized in that the first communication interface (101) is designed as an Ethernet interface or as an RS485 interface.

12. Energy measuring device (10) according to one of the preceding claims, characterized in that the second communication interface (102) is designed as an EtherCAT, EtherNet / IP, FID bus, Profibus or Profinet interface.

13. System (S) comprising an energy meter (10) according to one of claims 1 to 12, a local controller (S1) of an electrical local network station (1) and an external controller (S2) of an energy supply network (E) superordinate to the local network station (1), wherein there is a first communication connection (K1) between a first communication interface (101) of the energy meter (10) and the local controller (S1) and a second communication connection (K2) between a second communication interface (102) of the energy meter (10) and the external controller (S2).

14. System (S) according to claim 13, characterized in that in the event of a network fault, the external controller (S2) receives network information from the energy meter (10) via the second communication connection (K2).

15. A method for supplying network information of a local network (O) to a higher-level energy supply network (E) by an energy meter (1) of a local network station (1), wherein the energy meter (10) has at least one internal energy storage device (10), the method comprising: Detecting network information of the local network (O) by the energy meter (10); Transmitting the detected network information to a local controller (S1) of the local network station (1) via a first communication connection and / or to an external controller (S2) of the energy supply network; and in response to detection of a network fault by the energy meter (10), supplying components (101, 102, 104, 105, 106, 107, 108, 109) of the energy meter (10) with energy from the internal energy storage device (100) of the energy meter (10).

16. The method according to claim 15, characterized in that in response to the detection of the network disturbance of the local network (O), the energy measuring device (10) supplies network information to the external controller (S2).

17. Method according to claim 15 or 16, characterized in that the energy measuring device (10) is designed according to one of claims 1 to 12.

Images