Device and system for measuring energy

Abstract

The invention relates to a device (10) and a system for measuring electrical values, comprising a measuring component (20) for measuring electrical values, wherein the measuring component (20) has a first power supply (30), which is fed from an applied measurement voltage (35), and wherein the measuring component has a second power supply (40), which is fed externally (45). The device (10) further comprises a housing (50) of the device (10) for mounting on a mounting unit (100), wherein the measuring component (20) is arranged in the housing (50), wherein the housing (50) and / or the measuring component (20) have / has connection elements (60) for releasably connecting to the mounting unit (100), wherein the connection elements (60) are suitable for establishing a mechanical and an electrical connection to the mounting unit (100).

Description

[0001] Device and system for energy measurement

[0002] The invention relates to a pluggable, multifunctional energy measurement module for measuring electrical parameters in low-voltage systems. However, the invention also relates in particular to an energy measurement module for installation in a mounting unit, which in turn can be arranged on a mounting rail in a control cabinet. Simplified removal and arrangement of the energy measurement module facilitate separate evaluation, maintenance, and verification of the module. This can also include the renewal of certification, which must be carried out at regular intervals.

[0003] Energy measurement modules are designed to record at least some aspects of current, voltage, active power, and energy, which are typically used as the basis for billing electrical energy. They can be integrated as a module within an electrical device to record and transmit the electrical values ​​distributed or consumed within that device. Furthermore, they can be specially protected against misuse, ensuring the reliability of the values ​​they provide. Certifications exist that attest to this high level of reliability, such as the certificate according to Directive 2004 / 22 / EC of 31 March 2004 on measuring instruments, also known as the Measuring Instruments Directive (MID). For MID-certified devices, powering them from the measuring voltage is a common technical implementation.

[0004] The associated electrical system can be designed as an electrical component for a control cabinet. By using certified energy measurement modules, the rest of the electrical system's circuitry can remain uncertified without compromising the reliability of the measured values. Typically, the electrical system and the energy measurement module are manufactured separately, possibly by different manufacturers. The electrical system is usually mounted in DIN rail or front-mount enclosures, with wiring to the electrical system via cables. The energy measurement module is often installed during the assembly, configuration, or maintenance of the electrical device.

[0005] However, installing the energy measurement module involves considerable wiring effort. Various conductors must be integrated into the power paths of the electrical devices. This often necessitates large cable cross-sections, which are correspondingly complex to handle. Typical installation or removal of the energy measurement module in the field further increases the effort due to the specific local conditions. Significant assembly effort is also required during manufacturing. Furthermore, powering the energy measurement module from the applied measurement voltage, for example, according to MID (Measuring Instruments Directive), prevents the acquisition of parameters in the event of undervoltage or voltage failure, particularly since the power supply typically ceases to function when the measurement voltage deviates significantly from the intended range. Such parameters, however, are helpful for evaluating voltage fluctuations or outages.

[0006] The invention therefore aims to provide a technique that reduces the installation and removal effort of the energy measurement module in the electrical circuit, for example, in a control cabinet, and thus enables cost-effective certification of energy measurement modules installed in switching arrangements. Simplified removal and installation of the energy measurement module facilitate separate evaluation, maintenance, and testing of the module. This can also include recertification, which must be carried out at regular intervals. Simultaneously, relevant parameters of significant voltage dips or outages should be recorded and stored.

[0007] The problem is solved by the features of each of the independent claims. Advantageous embodiments and further developments of the invention are specified in the dependent claims.

[0008] Exemplary embodiments of the invention, which can be optionally combined with one another, are disclosed below with partial reference to the figures.

[0009] A first aspect concerns a device for measuring electrical values. This device comprises a measuring component for measuring electrical values, wherein the measuring component has a first power supply that is fed by an applied measuring voltage. Furthermore, the measuring component has a second power supply that is externally powered. The device also has a housing for mounting the device on a mounting unit, wherein the housing and, additionally or alternatively, the measuring component have connecting elements for a detachable connection to a mounting unit, the connecting elements being suitable for establishing a mechanical and an electrical connection to the mounting unit. The measuring component is arranged in the housing of the device.

[0010] The measuring component can include certifiable measurement functions for measuring electrical energy. This can include voltage, current, and power measurement. The certifiable measurement function can be implemented by a calibratable measuring circuit that forms part of the measuring component. The measuring component can also include components for current measurement. Furthermore, the measuring component can include operating and information elements for a user to display settings and measurement results, as well as to control the measuring component. The measuring component can also include a data interface through which measured values ​​can be transmitted to other electrical devices or settings for the measuring component can be received. Finally, the measuring component can include an inner housing and connecting elements for connection to electrical connectors within the housing, which correspond to their counterparts in the assembly unit.

[0011] A primary power supply provides the measuring component with electrical power in the form of a predefined voltage and corresponding currents. This primary power supply is powered by the applied measuring voltage (the voltage to be measured), in accordance with Directive 2004 / 22 / EC of 31 March 2004 on measuring instruments, also known as the Measuring Instruments Directive (MID). In addition to powering the actual measuring circuit, this primary power supply also powers the data interface, user interface components, and any other components present. If the primary power supply is functioning correctly, no power is supplied by the secondary power supply.

[0012] An applied measuring voltage is a voltage to be measured or evaluated. It is supplied to the measuring component via the housing and the mounting unit. It also serves to supply the primary power supply. The correct applied measuring voltage, as well as the correctly flowing measuring current, operate within a range between a minimum and a maximum voltage or current value. Further conditions can include the voltage waveform and, alternatively or additionally, the current waveform, for example, in the form of an AC sinusoidal waveform and its harmonics, their rate of change, and so on.

[0013] A second power supply provides electrical power to at least parts of the measuring component in the form of a predefined voltage and corresponding currents. In some embodiments, a MID-certifiable power supply can be directly powered by the first power supply, for example, with 5V. Optionally, this 5V supply can be standardized to 230V. The second power supply is powered by a separate voltage source, which in turn can be externally powered depending on the arrangement of the device containing the measuring component on the mounting unit. In other words, the power supply to the second power supply is fundamentally independent of any external power supply to the second power supply itself. The external power supply to the second power supply can be independent of the measuring voltage.

[0014] The housing of the device can be made of plastic, for example, an injection-moldable plastic. It serves to hold the measuring component, electrical and, additionally or alternatively, mechanical connecting elements, as well as additionally or alternatively, operating elements and the like.

[0015] An assembly unit essentially consists of a mounting unit housing, made of an injection-moldable plastic, which can be mounted on a mounting rail, and a multitude of electrical connectors (connecting elements) arranged within the mounting unit housing. Additionally or alternatively, it may also contain mechanical connectors (connecting elements) for connecting the unit to a device containing the measuring component. The connection to the device is detachable and often requires no tools. Optionally, electrical functional elements, such as components of an uninterruptible power supply (UPS), can also be integrated into the mounting unit. The shape and dimensions of the mounting unit and the mounted device correspond, for example, to the usual shapes and dimensions of components that can be mounted on mounting rails and are also commonly found in control cabinets.

[0016] Electrical and, alternatively or additionally, mechanical connecting elements can be designed as connectors, for example, in the form of plugs / sockets with spring contacts. They can establish both a mechanical and an electrical connection simultaneously. Their arrangement can form a so-called mating face, which can define specific functions, such as preventing rotation between the mounting unit and the device, specifying a particular operating mode, or similar. The connecting elements are arranged correspondingly in the device housing and the mounting unit housing. The connecting elements can have rectangular, square, and, alternatively or additionally, round plug contacts.

[0017] This allows for the advantageous realization of an easily replaceable measuring component that remains functional even at measuring voltages outside the measuring range.

[0018] In exemplary embodiments, the second power supply can provide power to at least parts of the measurement component (for example, a measuring circuit and, optionally, additionally, electronic memory modules) in the event of mains voltage dips that cause a malfunction of the first power supply. The second power supply is externally powered and includes an energy storage device for supplemental or alternative power supply. Optionally, the second power supply can be implemented, at least partially, as an uninterruptible power supply (UPS).

[0019] An external power supply for the second power supply can be provided by an external uninterruptible power supply (UPS).

[0020] A separate power supply can be provided. This can be implemented independently of the measurement voltage, ensuring that a suitable power supply to the second power supply remains available even if the measurement voltage drops or fails. For example, a switching unit, a charging unit for the energy storage device (battery), or similar components can be implemented as part of the second power supply. Alternatively, all the functions of an uninterruptible power supply can be implemented in an external device.

[0021] The energy storage device can be designed as a rechargeable battery. When the device is removed, it ensures the supply of the secondary power supply, which in turn powers the components of the measuring device, such as the measuring circuit. The energy storage device is recharged after the device is mounted on the assembly unit.

[0022] Uninterruptible power supplies (UPS) power connected devices independently of the usual power supply. They can be designed as standalone devices, for example, in the form of the Phoenix Contact product TRIO-UPS-2G / 1 AC / 24DC / 20. Alternatively, the uninterruptible power supply can also be distributed across an external function and an internal function integrated into a second power supply.

[0023] This allows for improved error analysis in both assembled and disassembled devices with integrated measuring components.

[0024] In other embodiments, the power supply from the second power supply can be limited to the basic functions of the measuring component. This can include a measuring circuit, memory modules, and the like, but not a display or an interface. Furthermore, the power supply can be temperature-dependent, with fewer components of the measuring component being powered as the temperature increases. Optionally, the basic functions can include the acquisition of relevant electrical parameters of the measuring voltage and / or current that indicate a power outage. In particular, measured values ​​can be permanently stored within a time-limited period surrounding the voltage dip or outage.

[0025] This allows the power supply of the second power supply to be reduced, resulting in a longer operating time for the second power supply given a limited capacity of the energy storage system.

[0026] In further embodiments, the device can include an interface unit powered by the second power supply, enabling external signal exchange. Optionally, the interface signals can include the transmission of electrical parameters of the measured voltage and / or current that indicate a power failure.

[0027] The interface unit can include storage, which is particularly used for storing data for

[0028] This includes protection against voltage dips or outages. This data is virtually permanently secured by the secondary power supply to the interface unit. Furthermore, the interface unit includes an interface for signal exchange with external devices, which can also include the stored data. This signal exchange can take place wirelessly or via cable. The interface unit can also exchange signals with MID-certifiable components of the device, for example, via the Universal Asynchronous Receiver / Transmitter (UART) protocol.

[0029] This also allows communication with the device even if the measuring voltage fails or after the device has been removed from the assembly unit.

[0030] In exemplary embodiments, the device can be mounted and dismounted on the assembly unit without tools. Alternatively or additionally, the device can be mounted in such a way that its removal from the assembly unit is obvious.

[0031] In this context, "tool-free" refers to the assembly or disassembly of the device onto or from the assembly unit without the use of tools. In other words, an operator's hands are sufficient to perform these tasks.

[0032] Obvious tampering can be detected, for example, by a damaged seal, an optical signal via LED or similar device, the reading of a corresponding date from a memory, a display on a screen, or other similar indicators. Various measures can also be combined.

[0033] This allows for the documentation of at least a temporary shutdown of the device, thus highlighting potentially unrecorded power consumption.

[0034] In other embodiments, an electrical connection and, alternatively or additionally, a mechanical connection and, alternatively or additionally, a wireless connection from the device to the assembly unit can be established.

[0035] A combined electrical and mechanical connection can be established using known connectors. Wireless connections can be implemented, for example, using Radio Frequency Identification (RFID), serving, among other things, to identify the device to the assembly unit. Mechanical connections can be designed as paired, at least partially elastic locking mechanisms cast onto the housing.

[0036] This allows for a cost-effective coupling or decoupling of the device and the assembly unit. In further embodiments, the measuring component can include a calibratable measuring circuit. The calibratable measuring circuit can be certified, for example, according to MID. Optionally, the measuring circuit can output a corresponding marking after a calibration / certification period.

[0037] The calibratable measuring circuit can be certified, for example, according to MID standards. Certification is time-limited. After its expiry, it must be renewed, or the measuring circuit can no longer be used as a certified unit. Requirements for energy meters or measuring instruments may also need to be met, for example, according to DIN EN 50470-3 VDE 0418-0-3, DIN EN IEC 62052-1 VDE 0418-2-1, DIN EN IEC 62053-21 VDE 0418-3-21, or PTB (Physikalisch-Technische Bundesanstalt - requirements PTB-A 20.1 or PTB-A 50.7).

[0038] The expiry of the validity period of the respective requirement can be indicated by an optical signal via LED or the like, by reading a corresponding date from a memory, by displaying it on a screen or the like.

[0039] The device can thus be advantageously designed as a recognized energy meter.

[0040] In exemplary embodiments, the measuring circuit of the measuring component can be parameterizable. Parameterization can be achieved via a plug-in interface of the connecting elements in the form of an electrical connection, and alternatively or additionally via a wireless connection between the device and the mounting unit. Optionally, the connecting elements can include connectors that provide both an electrical and a mechanical connection between the mounting unit and the measuring component.

[0041] The parameterization of the measuring component can be performed during the manufacturing of the device and, alternatively or additionally, during circuit design using a circuit design tool or in the field. For example, the assembly unit integrated into the circuit diagram can specify such parameterization via RFID. This can include measuring ranges, permissible signal waveforms, protocols between the device and the assembly unit, previously determined consumption values, supply voltage occurrences, and the like.

[0042] This allows for a simple replacement of the device, where relevant parameters are set on the mounting unit during assembly.

[0043] In other embodiments, the parameterization of the measuring circuit can include at least one function of setting the measuring range, defining a communication protocol, defining measured quantities to be transmitted, one or more quantities derived from the measured quantities, defining notification thresholds of electrical values, and parameters for setting the first power supply and, alternatively or additionally, the second power supply and, alternatively or additionally, the interface unit.

[0044] This allows a large number of parameters to be set in the measuring circuit of the measuring component of the device.

[0045] In other embodiments, the housing can have recesses for the connecting elements. Optionally, the housing or the arrangement of the connecting elements in relation to the mounting unit can provide anti-rotation protection.

[0046] The housing of the device can, for example, have recesses for electrically conductive and mechanically retaining connectors, allowing contact with the mating connectors through these recesses. These mating connectors can, for example, be arranged on a circuit board of the measuring component or the measuring circuit.

[0047] This allows for a cost-effective construction of the device.

[0048] In exemplary embodiments, the housing of the device can include part of a sealing device, which is designed, for example, as a feedthrough for a sealing rod or a sealing wire.

[0049] A corresponding sealing rod in the mounting unit can be designed as a column with a transverse hole at its upper end. When the device is mounted on the mounting unit, the rod engages in the opening and protrudes on the side facing away from the mounting unit. A bore in the protruding part allows for the insertion of a sealing wire.

[0050] This allows for the advantageous implementation of an established and, if necessary, prescribed safeguarding procedure for permanent assembly verification.

[0051] In other embodiments, the device may include an output and / or input unit designed for an operator, comprising at least one of the elements display, LED, electrical contacts and operating elements.

[0052] This allows the operator to read measured values ​​and other data from the device. Furthermore, the operator can parameterize the measuring component and, additionally or alternatively, the measuring circuit on-site. For example, the remaining calibration / certification time can be queried, or a corresponding signal can be specified.

[0053] A second aspect of the invention relates to a system for measuring electrical values. This comprises a device according to the first aspect and optionally associated embodiments. The system further comprises a mounting unit for receiving the device, the mounting unit having at least electrical connecting elements for connection to the device. The mounting unit further comprises additional electrical connecting elements for connection to other electrical components, devices, or terminals.

[0054] The system can be designed for installation in a control cabinet. It can include an energy meter, which may be certifiable for a limited time. The device can be removed from the mounting unit without tools, as described in more detail above. The mounting unit can establish all connections to the other circuit components and devices, so that the device itself can remain free of external wiring. Accordingly, no wiring is required when removing or reinstalling it. Furthermore, the permanently stored relevant data from the device's operation can be taken into account, for example, by replacing the device with a more suitable one.

[0055] This approach offers the advantage of cost-effective recalibration or re-certification of the device, as it avoids the time-consuming removal and subsequent reinstallation of the system from an existing circuit configuration. This is particularly beneficial when considering relevant data from the device's operation, for example, as an energy meter, which can be collected and evaluated separately from the mounting unit. This can lead to the use of alternative devices where, for example, the measuring range or reliability can be adapted to specific requirements.

[0056] In exemplary embodiments, the assembly unit can include a sealing device for sealing the assembly unit to the fixture. Optionally, the sealing device of the assembly unit can be designed as a rod.

[0057] Alternatively or additionally, an electrical seal can be provided that detects a decoupling of the device and the mounting unit and can be stored, for example, in a remotely readable memory and can also be displayed optically, either additionally or alternatively. This electrical verification can be implemented, for example, as a Hall sensor or a test loop.

[0058] An expansion of the device and thus an interruption of energy recording does not go unnoticed.

[0059] In other embodiments, the device and the mounting unit can have a wireless connection for signal exchange between the device and the mounting unit. Optionally, the mounting unit can be designed for mounting on a mounting rail, which may be located, for example, in a control cabinet. The wireless connection can be implemented, for example, as RFID or a similar technology. Additionally or alternatively, the wireless connection can also be configured for signal exchange between the device and an external operating device. Alternatively, the wireless connection can also be configured for signal exchange between the mounting unit and the external operating device.

[0060] This can advantageously reduce the number of electrical connections, which might only be used rarely for signal transmission.

[0061] The invention is explained in more detail below with reference to the accompanying drawings and to preferred embodiments, which can optionally be combined with one another.

[0062] Show:

[0063] Fig. 1 shows a schematic block representation of the device for measuring electrical values ​​according to a first aspect of the invention,

[0064] Fig. 2 shows a schematic block diagram of the second power supply,

[0065] Fig. 3 shows a schematic block representation of the device that can be mounted on the assembly unit without tools.

[0066] Fig. 4 shows a schematic block diagram of a measuring component comprising a calibratable measuring circuit,

[0067] Fig. 5 shows a schematic block representation of a housing of the device,

[0068] Fig. 6 shows a schematic block representation of an output and / or input unit designed for one operator,

[0069] Fig. 7 shows a schematic block representation of a system for measuring electrical values ​​according to a second aspect of the invention,

[0070] Fig. 8 shows a schematic block representation of the measuring component in relation to an interface part and a certified part, and

[0071] Fig. 9 shows a spatial representation of the device and the assembly unit.

[0072] Fig. 1 shows a schematic block diagram of the device 10 for measuring electrical values ​​according to a first aspect of the invention. The device 10 comprises a measuring component 20 for measuring electrical values. The measuring component 20 has a first power supply 30, which is supplied by an applied measuring voltage 35. The measuring component also has a second power supply 40, which is supplied externally 45. Additionally, the device 10 comprises a housing 50, which is suitable, among other things, for mounting on a mounting unit 100. The measuring component 20 is arranged in the housing 50. The housing 50 and, additionally or alternatively, the measuring component 20 have connecting elements 60 for a detachable connection with the mounting unit 100. The connecting elements 60 are suitable for establishing a purely mechanical connection 64 and, alternatively or additionally, an electrical connection to the mounting unit 100.

[0073] Fig. 2 shows a schematic block diagram of the second power supply 40 in the measuring component 20 of the device 10. The second power supply 40 provides power 44 to at least parts 15 of the measuring component 20 during such mains voltage dips 35 (not shown) that cause a malfunction of the first power supply 30 (not shown). The second power supply 40 includes an energy storage device 42 for supplementary or alternative power 47 to the second power supply 40. Optionally, the second power supply 40 is implemented, at least partially, as an uninterruptible power supply (UPS). The power 44 provided by the second power supply is limited to basic functions (parts) 15 of the measuring component 20. Optionally, the basic functions 15 include those components of the measuring component 20 that record electrical parameters of the measuring voltage 35 and / or the measuring current that characterize a mains power failure.Furthermore, the device 10 can include an interface unit 17, which can be powered by the second power supply 40 (not shown). The interface unit 17 enables external signal exchange. Optionally, the signals include the transmission of electrical parameters of the measured voltage 35 and, alternatively or additionally, the measured current, which indicate a power failure. The second power supply 40 is powered externally, for example, via a PoE (Power over Ethernet) supply. This external supply can also be provided via the interface 17 (not shown), which in this case can include an Ethernet connector, for example, an RJ45 connector in the EIA / TIA 568A or EIA / TIA 568B version.

[0074] Fig. 3 shows a schematic block diagram of the device 10, which can be mounted on the mounting unit 100. The device 10 can be mounted and dismounted on the mounting unit 100 without tools. The device 10 can be mounted in such a way that its removal from the mounting unit 100 is obvious. This can be achieved, for example, by means of a sealing wire (not shown) that can be inserted through the openings 52 of the device 10 and the mounting unit 100 and sealed. By mounting the device 10 onto the mounting unit 100, an electrical connection 62 and, alternatively or additionally, a mechanical connection 64 and, alternatively or additionally, a wireless connection 66 from the device 10 to the mounting unit 100 can be established. Fig. 4 shows a schematic block diagram of a measuring component 20, which includes a calibratable and certifiable measuring circuit 25.Optionally, the measuring circuit 25 outputs a corresponding identifier 29 after a calibration or certification period has elapsed. This identifier can be designed as an optical signal, as shown, and alternatively or additionally as a signal on an interface of the measuring circuit 25 (not shown), and alternatively or additionally as data stored in a memory (not shown). The measuring circuit 25 of the measuring component 20 can be parameterizable 27, whereby the parameterization 27 can be carried out via a plug-in interface (not shown) of the connecting elements 60 in the form of electrical connections (62) and alternatively or additionally via the wireless connection 66 between the device 10 and the mounting unit 100. Optionally, the connecting elements 60 can include connectors (not shown) that provide an electrical and a mechanical connection between the mounting unit 100 and the measuring component 20.The parameterization 27 of the measuring circuit 25 includes at least one of the functions of setting the measuring range, defining a communication protocol, defining measured quantities to be transmitted, one or more quantities derived from the measured quantities, defining notification thresholds of electrical values ​​and parameters for setting the first power supply 30 and alternatively or additionally the second power supply 40 and alternatively or additionally the interface unit 17.

[0075] Fig. 5 shows a schematic block view of a housing 50 of the device 10. The housing 50 has recesses 55 for the connecting elements 60. Optionally, the housing 50 or the arrangement of the connecting elements 60 relative to the mounting unit 100 provides anti-rotation protection (not shown). The housing 50 can have a sealing device 52, which can be configured as a receptacle for a sealing rod or as a guide for a sealing wire.

[0076] Fig. 6 shows a schematic block diagram of an output and / or input unit 70 designed for an operator. The device 10 comprises an output and / or input unit 70 designed for an operator, which includes at least one of the elements: display, LED, electrical contacts, and operating elements. The input unit 70 is arranged on the side of the device 100 facing away from the mounting unit 100 (not shown).

[0077] Fig. 7 shows a schematic block diagram of a system 200 for measuring electrical values ​​according to a second aspect of the invention. The system 200 comprises a device 10 according to the first aspect of the invention or one or more of its embodiments. The system 200 further comprises a mounting unit 100 for receiving the device 10, the mounting unit 100 having electrical connecting elements 110 for connection to the device 10. The mounting unit 100 further comprises additional electrical connecting elements 120 for connection to other electrical components. The mounting unit 100 may have a sealing device 155 for sealing the mounting unit 100 to the device 10. The sealing device 155 of the mounting unit 100 may be designed as a rod with a bore for receiving a sealing wire.In system 200, the device 10 and the mounting unit 100 can have a wireless connection (not shown) for signal exchange between device 10 and mounting unit 100. Optionally, the mounting unit 100 can be designed for mounting on a support rail 250, which in turn can be arranged in a control cabinet (not shown).

[0078] Fig. 8 shows a schematic block diagram of the measuring component 20 with respect to a non-certified part 310 (interface part) and a certified part 320 (MID part). The interface unit 17 is located in the non-certified part 310, which in turn includes the external interface 300 via which signals can be exchanged between the device 10 and the assembly unit 100. The non-certified part 310 also includes the second power supply 40, which in turn includes the energy storage device 42. The second power supply 40 is supplied independently of the measuring voltage, for example, by an uninterruptible power supply. This can be a 230 V AC supply or a 24 V DC supply. The interface unit 17 is supplied by the second power supply 40, for example, with 5 V DC. The certified part 320 of the measuring component 20 includes the first power supply 30 and the certifiable measuring circuit 25.The first power supply 30 is fed from the measurement voltage. If the measurement voltage is unsuitable for power supply, at least temporarily, for example due to a voltage drop, a supply from the second power supply 40 is used as a substitute, so that the first power supply 30 remains functional. The supply from the second power supply can be 230 volts according to the standard. The first power supply 30 powers the certifiable measurement circuit 25, i.e., the basic functions 15 of the measurement component 20. The interface unit 17 and the certifiable measurement circuit 25 exchange signals, for example according to the Universal Asynchronous Receiver-Transmitter (UART) protocol.

[0079] In other words, the non-certified part 310 of the device offers the possibility of using a second power supply 40 with a power supply optimized for the connection voltage. The second power supply 40 only operates if the first power supply 30 fails. In this case, the energy consumption of the second power supply 40 can be limited to the measuring circuit 25 and its basic functionalities. For example, the output unit and, alternatively or additionally, the input unit 70, for example, in the form of the display and the interface unit 17, could be switched off, particularly at high temperatures. Alternatively, Fig. 8 can also depict the device 10 instead of the measuring component 20 shown (not shown). In this case, the measuring component can include at least the certified part 320. Alternatively, Fig. 8 can also depict the system 200 (not shown).In this case, the non-certified part 310 can be located in the assembly unit 100 and the certified part 320 in the device.

[0080] Fig. 9 shows a three-dimensional representation of the device and the assembly unit in one embodiment. The device 10 is equipped with electromechanical connectors that establish the electrical and mechanical connection to the assembly unit 100. The device 10 also includes the input / output unit 70, which comprises a display and control buttons. The assembly unit 100 includes recesses for the connectors of the device 10. Furthermore, the assembly unit 100 has additional electrical connection elements 120 on opposite sides for electrical connection to other components of the circuit or control system. Finally, the assembly unit 100 includes the sealing bar for the system, consisting of the device 10 and the assembly unit 100.

[0081] In other words, the invention can also be described as follows: A key element of the invention is the mechanical design of energy measuring devices 200 into the modular components device 10 and mounting unit 100, each of which performs sub-tasks of the system 200. Thus, by separating the system 200 into a certified part 320 (device 10) (for example, according to MID) and a non-certified part 310 (mounting unit 100), two subsystems are created. These are designed to be pluggable. After being combined to form the intended system 200 (complete system), they can be sealed. They cannot be separated without breaking the seal.

[0082] Alternatively, the non-certified part 310 and the certified part of the device 320 can both be arranged in the device 100. In this case, the assembly unit 100 can be designed less complexly and, for example, only comprise the interfaces and their operation. Furthermore, an inventive certifiable system 200, for example, a MID-certified measuring device, with redundant power supply, is presented, which retains essential data even after removal.

[0083] In unstable power grids, voltages, especially the measuring voltage, can drop. In such cases, a conventional MID-compliant measuring device often can no longer operate reliably, as its supply, derived from the measuring voltage, only functions within a narrow voltage range. Troubleshooting, however, often requires knowing the electrical parameters at which the grid failure occurred. Separating the System 200 enables quick replacement or removal of the device 10 (certified sub-component), thus offering potential cost savings. Furthermore, this approach makes the System 200 (the overall system) scalable, allowing, for example, the design of the System 200 for different measuring ranges or the provision of different interfaces. As an additional advantage, this significantly reduces the product range.Furthermore, the power supply for system 200 is not provided solely via the measuring voltage, as is usually the case. Instead, an additional power supply is provided separately via external terminals. Since this can be supported, for example, by a UPS or similar device, the availability of system 200 is increased. Finally, the support of the second power supply 40 by the integrated energy storage device 42 enables the continuous storage of relevant data, particularly in the event of a power failure or interruption, even after the system components 10 / 100 have been disconnected, thus allowing for its evaluation even when the device 10 has been removed.

[0084] The invention can advantageously achieve the following improvements:

[0085] - Significantly reduced time required to completely remove the certifiable part of measuring instruments (MID after 7 years)

[0086] - Financially, this results in the improvement of only having device 10 of system 200 recertified.

[0087] Scalability is achieved while simultaneously reducing the number of system types required. This can be advantageous in cases of conflicting national metrology regulations, for which separate devices would otherwise need to be approved if the properties to be certified are mutually exclusive. Country-specific approvals are only required for the relevant subsystems, thus requiring inventiveness.

[0088] - Fault analysis is improved by the continued storage of relevant data during a failure or drop in the supply voltage.

[0089] Although the invention has been described with regard to exemplary embodiments, it is apparent to those skilled in the art that various modifications can be made and equivalents can be used as replacements. Furthermore, many modifications can be made to adapt a particular measurement situation or a specific material to the teaching of the invention. Consequently, the invention is not limited to the disclosed embodiments but encompasses all embodiments that fall within the scope of the appended claims.Reference numeral list 0 Device 5 Basic functions of the measuring component 7 Interface unit 0 Measuring component 5 Measuring circuit 7 Parameterization of the measuring circuit 9 Identification 0 First power supply 5 Applied measuring voltage 0 Second power supply 2 Energy storage 4 Power supply to measuring component 5 External power supply 7 Power supply to second power supply 0 Housing 2 Through-hole / sealing device in device and mounting unit 5 Recesses in housing 0 Connecting elements of the device 2 Electrical connection 4 Mechanical connection 6 Wireless connection 0 Output and / or input unit 00 Mounting unit 10 Electrical connecting elements of the mounting unit 20 Further electrical connecting elements of the mounting unit 55 Sealing device of the mounting unit 00 System 50 Mounting rail for the mounting unit 00 External interface 10 Non-certified part 20 Certified part.

Claims

Claims 1. Device (10) for measuring electrical values, comprising a measuring component (20) for measuring electrical values, wherein the measuring component (20) has a first power supply (30) which is supplied by an applied measuring voltage (35), and wherein the measuring component has a second power supply (40) which is supplied externally (45), a housing (50) of the device (10) for mounting on a mounting unit (100), wherein the measuring component (20) is arranged in the housing (50), wherein the housing (50) and / or the measuring component (20) have connecting elements (60) for a detachable connection with the mounting unit (100), wherein the connecting elements (60) are suitable for establishing a mechanical and an electrical connection to the mounting unit (100).

2. Device (10) according to claim 1, wherein the second power supply (40) provides power (44) to at least parts of the measuring component (10) in the event of mains voltage dips (35) that cause a malfunction of the first power supply (30), wherein the second power supply (40) comprises an energy storage device (42) for supplementary or alternative power supply (47) to the second power supply (40), optionally wherein the second power supply (40) is designed at least partially as an uninterruptible power supply (UPS).

3. Device (10) according to claim 1 or 2, wherein the supply (44) by the second power supply relates to basic functions (15) the measuring component (20) is limited, optionally wherein the basic functions (15) include the acquisition of electrical parameters of the measuring voltage and / or the measuring current that indicate a power failure.

4. Device (10) according to one of claims 1-3, wherein the device (10) comprises an interface unit (17) supplied by the second power supply (40), wherein the interface unit (17) enables external signal exchange, optionally wherein the signals comprise a transmission of electrical parameters of the measuring voltage (35) and / or the measuring current that indicate a power failure.

5. Device (10) according to one of claims 1-4, wherein the device (10) can be mounted and dismounted on the mounting unit (100) without tools, and / or wherein the device (10) can be mounted in such a way that dismounting the Device (10) from the assembly unit (100) becomes apparent.

6. Device (10) according to one of claims 1-5, wherein an electrical connection (62) and / or a mechanical connection (64) and / or a wireless connection (66) can be established from the device (10) to the assembly unit (100).

7. Device (10) according to one of claims 1-6, wherein the measuring component (20) comprises a calibratable measuring circuit (25), optionally wherein the calibratable measuring circuit (25) outputs a corresponding marking (29) after the expiry of a calibration period.

8. Device (10) according to claim 6, wherein the measuring circuit (25) of the measuring component (20) is parameterizable (27), wherein the parameterization (27) is effected by a plug-in interface of the connecting elements (60) in the form of the electrical connections (62) and / or by the wireless connection (66) between the device (10) and the assembly unit (100), optionally wherein the connecting elements (60) comprise connectors that provide an electrical and a mechanical connection between the assembly unit (100) and the measuring component (20).

9. Device (10) according to claim 8, wherein the parameterization (27) of the measuring circuit (25) comprises at least one function of setting the measuring range, defining a communication protocol, defining measured quantities to be transmitted, one or more quantities derived from the measured quantities, defining reporting thresholds of electrical values ​​and parameters for setting the first power supply (30) and / or the second power supply (40) and / or the interface unit (17).

10. Device (10) according to one of claims 1-9, wherein the housing (50) has recesses for the connecting elements (60), optionally, wherein the housing (50) or the arrangement of the connecting elements (60) provides anti-rotation protection with respect to the assembly unit (100).

11. Device (10) according to claim 10, wherein the housing (50) has a sealing device (52) which is designed as a passage for a sealing rod or a sealing wire.

12. Device (10) according to one of claims 1-1 1 , wherein the device (10) comprises an output and / or input unit (70) designed for an operator, comprising at least one of the elements display, LED, electrical contacts and operating elements.

13. System (200) for measuring electrical values, comprising a device (10) according to one of claims 1-12, a mounting unit (100) for receiving the device (10), wherein the mounting unit (100) has electrical connecting elements (110) for Connection with the device (10), wherein the assembly unit (100) has further electrical connecting elements (120) for connection with other electrical components.

14. System (200) according to claim 13, wherein the assembly unit (100) has a sealing device (155) for sealing the assembly unit (100) to the device (10), optionally wherein the sealing device (155) of the assembly unit (100) is designed as a rod.

15. System (200) according to one of claims 13 or 14, wherein the device (10) and the mounting unit (100) have a wireless connection (66) for signal exchange between the device (10) and the mounting unit (100), optionally wherein the mounting unit (100) is designed for mounting on a support rail (250).

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