LU502488B1 - Measuring device for measuring current in an energy distribution system - Google Patents

Abstract

A measuring device for measuring current in a power distribution system (200), comprising: a substrate (3) for arrangement on a busbar (203A - 203C), the substrate (3) extending along an extension direction of the busbar (203A - 203C); at least two magnetic field sensors (5A - 5N) arranged at different positions on the substrate (3) along the direction of extension of the busbar (203A - 203C), the magnetic field sensors (5A - 5N) being designed to detect one of the busbar (203A - 203C) generated magnetic field (B1 - BN) and for outputting a signal based on the detected magnetic field (B1 - BN), the signal indicating the current (I1 - I3) flowing through the bus bar (203A - 203C); and an evaluation unit (7) arranged on the substrate (3) and connected to the magnetic field sensors (5A - 5N), the evaluation unit (7) being adapted to detect the signals. Furthermore, the invention proposes a measuring system.

Description

Measuring device for measuring current in a power distribution system LU502488

The invention relates to a measuring device for measuring current in one

Energy distribution system, and a measuring system, having at least one

Measuring device and a central unit.

Known energy distribution systems allow various units, such as

Connections, adapters and other components can be mounted on busbars by plugging them in. For this purpose, for example, the components are attached with hooks

Busbars are hung and at the same time the busbars are contacted with these hooks. The suspended units then draw power via the busbar and deliver the power to the consumers. In order to be able to measure the current of the individual units, measuring devices designed as measuring adapters are known, which are mounted between the busbar and the units. For example, the document EP 3 829 010 A1 describes an adapter device for various types

Busbar systems.

However, these measuring adapters have a large installation height, as the components are available

Current measurement requires additional space. In addition, a design with a high structure is mechanically unstable and costly to produce. Due to the large number of different plug-in units, separate measuring adapters must also be provided for each unit width, which also requires such adapters

Solutions more expensive.

The object of the present invention is to provide a measuring device that is inexpensive to manufacture, has a flat structure, can be used universally in different energy distribution systems and is more accurate

Measurement results possible.

This task is solved by an object with the features of claim 1.

Accordingly, the measuring device has a substrate for arrangement on a busbar, the substrate extending along an extension direction of the busbar. The direction of expansion can be understood here as a direction of progression of the busbars. Furthermore, the measuring device has at least two

Magnetic field sensors located at different positions on the substrate along the

Extension direction of the busbar are arranged, wherein the magnetic field sensors are designed to detect a magnetic field generated by the busbar and LU502488 for outputting a signal based on the detected magnetic field, the signal indicating the current flowing through the busbar; and an evaluation unit arranged on the substrate and connected to the

Magnetic field sensors, whereby the evaluation unit is adapted to detect the signals.

The substrate can be formed from a flat, electrically insulating material, for example from a plastic material, in particular from a fiber-reinforced plastic material, and can extend at least in sections along the direction of expansion of the busbar. For example, the substrate can have one

Fasteners can be attached directly to the busbar, or at a distance from it

The busbar can be attached. This can be done for an arrangement directly on the power rail

Fastening means, for example, have an adhesive for gluing the substrate to the busbar. In the case of a spaced arrangement this can

Fastening means have a holding means to keep the substrate spaced from the

to hold the power rail.

The at least two magnetic field sensors can be understood, for example, as sensors that use the Hall effect to measure the magnetic field on the busbar. However, sensors such as fluxgate sensors or

Resistance current sensors are used. Under the order of the

Magnetic field sensors at different positions on the substrate along the

The direction of expansion of the busbar can be a spaced arrangement

Magnetic field sensors are understood to each other. For example, there can be an outlet of the busbar between the two positions and a first current can be measured before the outlet with the first sensor and a second current can be measured after the outlet with the second sensor. This can be used as a departure

Connection of a consumer to the power rail can be understood.

The evaluation unit can be designed as a computing unit, for example as an integrated circuit or as a microcontroller, and can be connected to the magnetic field sensors in order to be able to detect signals from the magnetic field sensors. The evaluation unit can be connected to a central unit via an interface.

The measuring device described here is advantageous through the use of

Magnetic field sensors that are arranged on a substrate have a very low height and can also be used in installations with limited installation space. Furthermore, the measuring device can be designed cost-effectively on a circuit board, which is included in its LU502488

Dimensions can be easily adapted to the dimensions of a corresponding busbar.

In one example, a plurality of magnetic field sensors are on the substrate along the

Direction of expansion of the busbar arranged at different positions with a uniform distance between the magnetic field sensors.

For example, the distance between the magnetic field sensors can be

Energy distribution system must be adapted with which the measuring device is used. At least one magnetic field sensor can be arranged between adjacent outlets in order to be able to detect the currents on the busbar before and after the outlets. Advantageously, the current that flows into each outlet can be recorded by forming a difference between the detected currents from neighboring magnetic field sensors.

Several measuring devices can also be connected to one another via appropriate interfaces and arranged along the busbar. Alternatively, this can also be done

Substrate of a measuring device adapted, for example shortened, in order to be able to be adapted to a specific length of the busbar.

In an alternative example, the magnetic field sensors can also be arranged at different distances from one another on or on the substrate in order to be adapted to a correspondingly constructed energy distribution system.

In one example, the measuring device has at least one interface which is arranged on the substrate and is connected to the evaluation unit, wherein the at least one interface is designed for connection to a central unit and/or a further interface of a further measuring device.

For example, the measuring device can have a cable connection or a wireless connection

Connection must be connected to a central unit, to which also others

Measuring devices that are arranged on further busbars are connected.

Furthermore, several can advantageously be connected via corresponding interfaces

Measuring devices are connected to each other. For example, several can

Busbars are plugged together.

In one example, the at least one interface comprises a plug connection, a LU502488

Radio interface, or an interface for powerline communication.

Depending on the desired application, the interfaces can advantageously be designed to be different but compatible with one another.

In one example, the substrate includes a circuit board.

The circuit board can also be referred to as a circuit board, circuit board, or printed circuit and can serve as a carrier for the magnetic field sensors, the evaluation unit, and/or the at least one interface. The connections between the components arranged on the circuit board can be made via conductor tracks.

The measuring device can therefore advantageously be formed cost-effectively on a circuit board using known circuit board technologies, such as surface mounting, SMD, or through-hole mounting.

The invention also relates to a measuring system, comprising: at least one measuring device for arrangement on a busbar

power distribution system as described herein; and a central unit connectable to at least one evaluation unit of the at least one

Measuring device.

The central unit can comprise a processor which detects the signals from the at least one connected measuring device, in particular the signals from several connected measuring devices. The connection between the

Evaluation unit(s) can be designed to be wireless or wired and the

Central unit can be arranged in an area of the energy distribution system.

For example, the central unit can be mounted on a mounting rail.

The central unit advantageously enables evaluation, further processing,

Linking and/or displaying the captured signals.

In one example, the measuring system has at least one current sensor for arrangement on the busbar, which is connectable to the central unit or is included by the central unit, wherein the current sensor is adapted to measure a feed current on the busbar.

The current sensor can be designed as a current transformer, for example as a Rogowski current transformer, LU502488, and can measure the feed current at a feed point on the busbar. 5 The accuracy of a current measurement with one described here can be advantageous

Measuring device can be increased, i.e. if there is already an accurate one at the feed point

Current measurement is carried out and the values obtained from the magnetic field sensors, for example in the central unit, in relation to that measured with the current sensor

feed current can be set.

In one example, the central unit is designed to record the signals from the magnetic field sensors and has a processor that is adapted to: - the position, - the type, and - the current consumption of current collectors on the busbar, which are between the

Magnetic field sensors are arranged to detect based on the signals.

Pantographs can be advantageous by determining a difference in the detected

Current values at outlets can be detected between neighboring magnetic field sensors.

The difference value determined in this way can be further advantageously compared with known ones

Current consumption values for known current collectors are compared in order to determine the

Determine the type of pantograph. Interruptions, undercurrents and overcurrents, as well as transients can also be advantageously detected.

In one example, the measuring system has a voltage measuring device for arrangement on the busbar, which is connectable to the central unit or is comprised by the central unit, wherein the processor of the central unit is further configured to measure and monitor the voltage and based on the signals the magnetic field sensors and the voltage to calculate individual power consumption of the current collectors.

Measuring the voltage can advantageously be used to accurately record the power of the individual current collectors and compare individual consumption.

In one example, the central unit is designed for individual electrical variables

Calculate current collector based on measured variables, in particular a phase angle.

In this way, services such as active, apparent and reactive powers of the respective current consumers in the energy distribution system can be advantageously calculated.

For example, a central unit designed in this way can enable a 4-quadrant measurement, i.e. the measurement of active and reactive energy in reference and

Dispensing direction. This means that electricity or energy can be extracted from the

Energy distribution system, as well as a power or energy feed into it

Energy distribution system can be recorded.

In one example, the central processing unit's processor is customized based on the

Signals from the magnetic field sensors, a digital image of an arrangement of the

Create pantographs along the busbar.

This illustration can advantageously be shown on a display in the central unit, or on a display connected to the central unit, in order to provide the user with a quick overview of the individual current collectors in the energy distribution system. Another advantage is the digital imaging of the components

Energy distribution system the early detection of incorrect installation, a possible

Overloading by adding more pantographs, as well as enabling automatic documentation. Alternatively, data relating to the image can also be output digitally via a suitable interface of the central unit

Storing, further processing and/or displaying on or on an external device.

In one example, the measuring system includes a variety of other measuring devices

Arrangement on the busbar or on other busbars, with the further ones

Measuring devices can be connected to the central unit.

This advantageously allows currents to be transferred to additional multi-phase busbars

Energy distribution systems are recorded simultaneously.

In one example, the measuring system comprises at least three measuring devices

Arrangement on one busbar in a three-phase power distribution system.

In one example, the measuring system comprises at least one identification means, in particular a radio frequency identification, RFID, chip, which can be arranged on at least one current collector, and at least one reading device connected to the

Central unit for reading the identification means.

The use of identification means such as RFID chips can be advantageous

Current collectors are clearly recorded by the central unit.

The idea underlying the invention will be explained in more detail below using the embodiments shown in the figures. Show it:

Figure 1 is a schematic view of a busbar

Energy distribution system with arranged thereon

magnetic field sensors; and

Figure 2 is a schematic view of a measuring system in a three-phase energy distribution system.

Figure 1 shows a schematic view of a busbar 203A

Energy distribution system 200 with magnetic field sensors 5A - 5N arranged on it in order to

To clarify the principle of linear current measurement.

In the schematic view, a plurality of magnetic field sensors 5A - 5N are arranged at different positions along the direction of extension of the busbar 203A, the magnetic field sensors 5A - 5N each being designed to detect a magnetic field Bs - Bn generated by the busbar 203A and to output a signal based on the detected magnetic field B1 - Bn, the signal indicating the current flowing through the busbar 203A at the position of the respective magnetic field sensor 5A - 5N.

Furthermore, outlets 201A - 201N are shown as examples, which are electrically connected to current collectors or consumers and contact the busbar 203A with hook-like elements.

The magnetic field, or the magnetic flux density, Bs is determined by the

Magnetic field sensor 5A is detected and the magnetic field sensor 5A is adapted to output a signal based on the detected magnetic field B+, which indicates the current flowing through the bus bar 203A at the position of the magnetic field sensor 5A. In the example shown in Figure 1, the current corresponds to the feed current or total current ltotal. The

Current |4 is determined from a difference determined by the magnetic field sensors 5A and 5B

Currents are formed based on the detected magnetic fields Bs and B2. The current I; is the LU502488

Current that flows through the outlet 201A to the pantograph connected to it.

Analogously, the current I2 is formed from a difference between the currents determined by the magnetic field sensors 5B and 5C based on the detected magnetic fields B2 and Bs. The

Current |, is the current transmitted through the outlet 201B to the connected to it

Current collector flows. The current Is is also determined as described above.

Figure 2 shows a schematic view of a measuring system 100 in a three-phase energy distribution system 200.

The measuring system 100 shown has three measuring devices 1A - 1C, which are each arranged on a busbar 203A, 203B, 203C in the three-phase

Energy distribution system 200. The three measuring devices 1A - 1C shown are constructed similarly and each have a substrate 3 which is arranged on a respective busbar 203A - 203C. As shown in Figure 2, the respective substrates 3 extend along an extension direction of the bus bars 203A - 203C. On the substrates 3 there are one each of the bus bars 203A - 203C along the direction of extension

A plurality of magnetic field sensors 5A - 5N are arranged at different positions with a uniform distance between the magnetic field sensors 5A - 5N.

In the embodiment shown, several of the magnetic field sensors 5A - 5N are arranged between the adjacent outlets in order to be able to detect the currents on the busbars 203A - 203C before and after the outlets 201A - 201N. As already described with reference to FIG. 1, the magnetic field sensors 5A - 5N are designed to detect a voltage emanating from the respective busbar 203A - 203C

Magnetic field at the position of the respective magnetic field sensor 5A - 5N and for outputting a signal based on the detected magnetic field, the signal being determined by the

The busbar shows the current flowing at the position of the respective magnetic field sensor 5A - 5N. Furthermore, the measuring devices 1A - 1C shown each have one

Evaluation unit 7, which is arranged on the respective substrate 3 and is connected to the respective magnetic field sensors 5A - 5N, for detecting the signals of the

Magnetic field sensors 5A - 5N.

It is also shown in Figure 2 that the measuring devices 1A - 1C each have one

Have interface 9, which is arranged on the respective substrate 3 and is connected to the respective evaluation unit 7. About the interfaces 9 of the

Measuring devices 1A - 1C, for example, a wired connection to the central unit 300 shown can be established. In further embodiments, the LU502488

Connection can also be made wirelessly.

2 also shows a current sensor 400, which is arranged on a busbar 203B and can be connected to the central unit 300. The current sensor 400 is arranged on the busbar 203B in such a way that the feed current lgs is at the

Busbar 203B is measured.

The current sensor 400 shown is designed as a current transformer and serves to increase the accuracy of the current measurement with the measuring device 1B, i.e. when on the

An accurate current measurement is already carried out at the feed point and is carried out by the

Magnetic field sensors 5A - 5N values obtained in the central unit 300 are set in relation to the feed current lges measured with the current sensor 400.

The central unit 300 shown can be connected to the interfaces 9 of the

Measuring devices 1A - 1C and has a processor that adapts: - the position, - the type, and - the current consumption of current collectors on the busbars 1A - 1C, which are arranged between the magnetic field sensors 5A - 5N, based on the signals recognize.

The central unit 300 shown also has a voltage measuring device for measuring the

Voltage of the respective busbars 1A - 1C based on the signals of the

Magnetic field sensors 5A - 5N and the voltage, individual power consumption

Calculate current collectors.

Furthermore, the central unit 300 shown is adapted based on the signals from the

Magnetic field sensors 5A - 5N to create a digital image of an arrangement of the current collectors 201A - 201N along the busbars 203A - 203C. This image can then be shown on the display 301 of the central unit 300.

Reference number list 1, 1A - 1C measuring device 3 substrate

SA - 5N magnetic field sensor 7 evaluation unit 9 interface 100 measuring system 200 energy distribution system 201A - 201N outlet 203A - 203C busbar 300 central unit 301 display 400 current sensor

Bi - Bn magnetic field [1-13 current total feed current

Claims (14)

Patent claims 1. Measuring device for measuring current in a power distribution system (200), characterized by a substrate (3) for arrangement on a busbar (203A - 203C), the substrate (3) extending along an extension direction of the busbar (203A - 203C); at least two magnetic field sensors (5A - 5N) arranged at different positions on the substrate (3) along the direction of extension of the busbar (203A - 203C), the magnetic field sensors (5A - 5N) being designed to detect one of the busbar (203A - 203C) generated magnetic field (B- - Bn) and for outputting a signal based on the detected magnetic field (B+ - Bn), the signal indicating the current (I1- Is) flowing through the bus bar (203A - 203C); and an evaluation unit (7) arranged on the substrate (3) and connected to the magnetic field sensors (5A - 5N), the evaluation unit (7) being adapted to detect the signals. 2. Measuring device according to claim 1, characterized by a plurality of magnetic field sensors (5A - 5N) arranged on the substrate (3) along the direction of extension of the busbar (203A - 203C) at different positions with a uniform distance between the magnetic field sensors (5A - 5N) . 3. Measuring device according to one of claims 1 or 2, characterized by at least one interface (9) arranged on the substrate (3) and connected to the evaluation unit (7), the at least one interface (9) being designed for connection to a central unit (300) and/or a further interface (9) of a further measuring device (1, 1A - 1C). 4. Measuring device according to claim 3, characterized in that the at least one interface (9) comprises a plug connection, a radio interface, or an interface for powerline communication. 5. Measuring device according to one of the preceding claims, characterized in that the substrate (3) comprises a circuit board. 6. Measuring system, comprising: at least one measuring device (1, 1A - 1C) for arrangement on a busbar (203A - 203C) of an energy distribution system (200) according to one of the preceding claims; and a central unit (300) connectable to at least one evaluation unit (7) of the at least one measuring device (1, 1A - 1C). 7. Measuring system according to claim 6, characterized by at least one current sensor (400) for arrangement on the busbar (203A - 203C) and connectable to the central unit (300), or comprised by the central unit (300), the current sensor (400) being adapted is for measuring a feed current (lges) on the busbar (203A - 203C). 8. Measuring system according to one of claims 6 or 7, characterized in that the central unit (300) is designed to detect the signals from the magnetic field sensors (5A - 5N), and has a processor which is adapted to: - the position, - the type , and - to detect the current consumption of current collectors on the busbar (203A - 203C), which are arranged between the magnetic field sensors (5A - 5N), based on the signals. 9. Measuring system according to claim 8, characterized by a voltage measuring device for arrangement on the busbar (203A - 203C) and connectable to the central unit (300), or comprised by the central unit (300), wherein the processor of the central unit (300) is further designed to measure and monitor the voltage and, based on the signals from the magnetic field sensors (5A - 5N) and the voltage, to calculate the individual power consumption of the current collectors. 10. Measuring system according to claim 9, characterized in that the central unit (300) is designed to calculate individual electrical variables of the current collector based on measured variables, in particular a phase angle. 11. Measuring system according to one of claims 8 to 10, characterized in that the processor of the central unit (300) is adapted based on the signals from the Magnetic field sensors (5A - 5N) to create a digital image of an arrangement of the LU502488 current collectors along the busbar (203A - 203C). 12. Measuring system according to one of claims 6 to 11, characterized by a plurality of further measuring devices (1, 1A - 1C) for arrangement on the busbar (203A - 203C) or on further busbars (203A - 203C), and wherein the further measuring devices ( 1, 1A - 1C) can be connected to the central unit (300). 13. Measuring system according to claim 12, characterized by at least three measuring devices (1A - 1C) for arrangement on one busbar (203A - 203C) in a three-phase energy distribution system (200). 14. Measuring system according to one of claims 6 to 13, characterized by - at least one identification means, in particular a radio frequency identification, RFID, chip, which can be arranged on at least one current collector, and - at least one reading device connected to the central unit (300) for reading the means of identification.