DE102024105579A1 - Measuring device for a high-voltage system - Google Patents

Abstract

The invention relates to a measuring device (1) for detecting electrical measured variables of components to be tested in a high-voltage system of an electrified vehicle, in particular an electric vehicle and/or a hybrid vehicle, wherein the measuring device (1) has a housing (2). Furthermore, the measuring device (1) has at least two connection units (3, 4) via which the components of the high-voltage system to be tested can be connected to the measuring device (1). Furthermore, the connection units (3, 4) are electrically connected to one another via lines (5, 6) which, when the measuring device is used as intended, are at least temporarily current-carrying and which are at least partially guided in the housing (2) of the measuring device (1). At least one of the current-carrying lines (5, 6), which is at least temporarily current-carrying when the measuring device (1) is used as intended, has at least one section (14) within the housing (2) which is guided separately from a shielding line (7). The housing (2) has an insulated cable duct (12). At least part of the section (14) of one of the lines (5, 6) that is at least temporarily live when the measuring device (1) is used as intended is arranged in the cable duct (12). The cable duct (12) is designed in such a way that it can be completely encompassed from outside the measuring device (1), at least in sections.

Description

The present invention relates to a measuring device for recording electrical measured variables of components to be tested in a high-voltage system of an electrified vehicle, in particular an electric vehicle and/or a hybrid vehicle, wherein the measuring device has a housing. The measuring device also has at least two connection units via which the components of the high-voltage system to be tested can be connected to the measuring device. The two connection units are also electrically connected to one another via lines that are at least temporarily live when the measuring device is used as intended and at least one shielding line that run at least partially in the housing of the measuring device.

State of the art

Electrified vehicles are becoming increasingly popular as an alternative to conventional vehicles that are powered exclusively by an internal combustion engine. In this case, an electrified vehicle is a vehicle that can be operated at least partially electrically and has a rechargeable electrical storage device. Electrified vehicles include electric vehicles and hybrid vehicles. In an electric vehicle, a large battery or a group of batteries or another energy storage unit is used to store electrical energy, with the stored electrical energy being used by an electric motor to drive the electric vehicle. A hybrid vehicle is an electrified vehicle that, in addition to an electric motor, is equipped with an internal combustion engine that serves at least partially for propulsion. Furthermore, vehicles with fuel cells or accumulators can also be counted as electrified vehicles.

Electrified vehicles therefore usually have a powerful energy storage device for storing electrical energy - usually in the form of a high-voltage battery to operate the electric drive machine or the electric drive motor. This high-voltage battery is also known as a drive or traction battery. Electrified vehicles also have various consumer systems and components, such as an electric drive machine, inverters to control the electric drive machine, voltage converters (e.g. DC-DC converters), on-board chargers (OBC) and other auxiliary units (e.g. pumps, heating elements, etc.), which are electrically connected to the powerful high-voltage battery. These consumer systems or components form the so-called high-voltage system or HV system of the vehicle, which is usually operated with an operating voltage of over 60 V, usually in a range of several 100 volts (e.g. between 200 V and 1 kV). The components of the HV system are usually connected via a large number of high-voltage cables, which have corresponding connection units or plugs. The HV cables are designed for the respective currents and voltages in the HV system and are marked orange in accordance with ISO 6469-3 and ECE-R 100 (e.g. in the form of a sheath with orange-colored insulation) and are safety-protected. In order to avoid interference and radiation effects in HV cables, for example, shielded cables are mainly used as HV cables. This means that HV cables have at least one current-carrying conductor or at least one wire, a braided shield or shielding separated by insulation and also external insulation. HV cables for direct voltage are often only single-core - i.e. the cable includes a current-carrying conductor, a shield and corresponding insulation. For example, HV system cables that are permanently connected to a positive pole of the battery are referred to as positive cables and HV system cables that are permanently connected to a negative pole of the battery are referred to as negative cables. Alternatively, DC voltage cables can also be multi-core, with a two-core cable comprising two current-carrying conductors - i.e. positive and negative conductors - in addition to shielding and insulation.

In order to test the functionality of the electrified vehicle and in particular the safety of the HV system, for example during vehicle development or, for example, to check the maintenance of electrified vehicles already available on the market, it is necessary to be able to record and evaluate various electrical measured variables, especially voltages and/or currents, in the HV system. Since it is neither practical nor safe and sometimes not technically feasible to connect different measuring sensors to record the various electrical variables, for example to the charging socket of the electrified vehicle, separate measuring devices or adapters are used, which are also referred to as breakout boxes. With the help of these measuring devices, the measured variables required for a particular measuring application, in particular voltage and/or current, can be recorded using measuring devices and/or a test system, for example, in order to test the functionality of individual components of the HV system, connections between two or more components of the HV system or the function of ality of the HV system. Typical measurement applications include determining or measuring the absence of voltage in the HV system, direct voltage measurements on components in the HV system or the battery, voltage measurements in the activated HV system, insulation monitoring or checking the insulation of components and/or cables in the HV system, resistance and capacitance measurements, or current or power measurements with an active HV system.

The measuring devices are used to make measured values of electrical variables, especially voltage and/or current, accessible without damaging the connections or cables between the components of the HV system and without endangering the operating personnel. This means that a measuring device for recording the respective electrical variables, especially voltage and/or current, is connected to the components to be tested or integrated into an existing connection in the HV system. The measuring device can, for example, use suitable connecting cables to either replace an existing connection in the HV system or be installed in addition to a connection in the HV system. For this purpose, it is necessary for the measuring device to have appropriately adapted connection plugs in order to be able to establish an electrically conductive connection with the components of the HV system to be tested, since the connections (e.g. number of contacts, shape of contacts, etc.) of the component to be tested are usually not standardized or designed to be component-specific.

In the simplest case, the measuring device or breakout box can, for example, only have connections to which an external measuring device required for the respective measuring application and for recording the respective electrical measurement variable can be connected. EN 20 2019 104 478 U1 shows, for example, a high-voltage test adapter for checking that motor vehicles that also have an HV system are free of voltage. This high-voltage test adapter can be used to connect an external measuring device to either a battery connection cable or a system connection cable in order to determine, for example, that the battery or the HV system of the vehicle is free of voltage.

However, it is not uncommon for a measuring module for voltage and/or current measurement to be integrated into the measuring device. For current measurement, the measuring module can, for example, have a current sensor (e.g. measuring resistor, Hall sensor, etc.). For outputting the measured values recorded by the current sensor, a signal output in the measuring device or a signal cable that leads from the measuring device can be provided. The measured values can then be made available to a test system, for example, via the signal output or the signal cable. Since the integrated measuring module usually has a specified current measuring range, the measuring device must be selected for the specific application based on the integrated measuring module. Furthermore, compatibility with the measuring devices and/or test system used for the measuring application must be ensured, for example, since measuring technology that is not compatible with the measuring module can lead to incorrect measurement results. In addition, the measuring device must usually be calibrated for the specific application after it has been installed in the vehicle or after a connection has been established with the HV system and before the measuring application is carried out in order to avoid incorrect current measured values.

Alternatively, it would be possible to measure the current, for example, between two components of the HV system or on an HV line of the HV system outside the measuring device, for example directly on the HV line or on the connecting line via which the measuring device is connected to the HV system, e.g. with a current clamp. However, such a current measurement only makes sense if the line on which the current clamp is being used, for example, has only one current-carrying conductor or is single-core. HV lines and thus also the connecting lines to the measuring device are usually heavily shielded. This would mean that, for example, when measuring the current on the connecting line of the measuring device to the HV system, a current occurring in the shielding - a so-called shielding current - would also be measured in addition to the current in the current-carrying conductor. The measured current values would therefore be distorted by the shielding current and could therefore lead to incorrect test and/or inspection results.

Description of the invention

The invention is therefore based on the object of specifying a measuring device for detecting electrical measured variables of components to be tested in a high-voltage system of an electrified vehicle, which enables a relatively precise and accurate measurement of current values in a simple and safe manner for the user, and which can be used flexibly for measuring applications in the high-voltage system.

These and other objects are achieved by a measuring device according to the independent claim. Advantageous embodiments of the present invention are described in the dependent claims.

According to the invention, the object is achieved by a measuring device of the type specified at the outset, in which at least one of the lines that are at least temporarily live when the measuring device is used as intended has at least one section within the housing that is separated from the shielding line and/or is not enclosed by a shield. Furthermore, the housing of the measuring device has a cable duct that is designed to be insulated, and at least part of the section that is separated from the shielding line of one of the lines that are at least temporarily live when the measuring device is used as intended, via which the two connection units of the measuring device are electrically connected to one another in the housing of the measuring device, is arranged in the cable duct. The cable duct is designed in such a way that it can be completely encompassed from outside the measuring device, at least in sections.

Advantageously, the cable feedthrough is designed at least in sections such that a clamp current meter can be attached, in particular without additional cable intervention.

The main aspect of the proposed solution is that the measuring device can be used to measure current values between two components of a high-voltage or HV system or on HV connecting cables in a very simple and safe manner for the user, for example by attaching a clamp-on ammeter to the appropriately designed cable feedthrough of the measuring device housing without additional cable intervention. In other words, the clamp-on ammeter encompasses the cable feedthrough at least in sections and measures the current in the current-carrying cable whose unshielded section is partially arranged in the cable guide, without having to break a circuit or establish a direct connection to the current-carrying cable.

The measuring device also offers the advantage that the current values can be measured relatively precisely and accurately, since at least part of the section of one of the current-carrying lines that is separate from the shielding is arranged in the cable feedthrough, which is designed to be enveloping and to which the clamp current meter can be attached in a simple and safe manner. The section that electrically connects the two connection units for connecting components of the HV system to one another within the housing of the measuring device is arranged in a separate manner. Therefore, no shield current is measured during the current measurement, but only measured values of the current flowing in the current-carrying line whose unshielded section is arranged in the cable feedthrough are determined, and thus measured values of the current flowing in the respective connection line. The measuring device can therefore be used for measuring applications in which the functionality of individual or multiple components of the HV system or of HV connection lines is to be tested and/or checked.

In a variant of the invention, the housing of the measuring device has at least one connection socket for connecting an external measuring or testing unit. In this way, the measuring device can be expanded for additional measuring and testing work.

It is also advantageous if the cable duct has double insulation. This makes it very easy to achieve greater safety for the user of the measuring device. For example, the double insulation of the cable duct can achieve protection class II, which is specified for electrical equipment in the EN 61140 standard, for example.

Ideally, the cable duct on the housing can be designed in the form of a handle, eyelet or loop. This makes it easier to grasp the cable duct and, in particular, the clamp ammeter can be attached to the cable duct very easily and safely without the need for additional cable intervention and, especially in combination with double insulation, special training or education for handling high-voltage systems.

Furthermore, it is advantageous if the connection units of the measuring device are designed to be interchangeable. In the context of the present disclosure, interchangeable means that the connection units can be detached from the measuring device and reconnected to it, i.e. are not designed as a single piece with it. In this way, a connection unit can be detached or replaced for maintenance or adjustment purposes. This means that the measuring device can be adapted very easily, quickly and flexibly to different measuring applications or to the respective connections of the component of the HV system to be connected, since a component-specific connection unit can be made available depending on the measuring application and/or component of the HV system to be connected. The interchangeable connection units can be used for specific cables introductions or the attachment of specific housing plugs or sockets.

Ideally, the connection units are each integrated into a housing part of the housing, with each housing part preferably being designed to be interchangeable. This means that the housing parts with the integrated connection unit can be easily exchanged for the respective measuring unit or application so that the measuring device has the appropriately adapted or prefabricated connections (e.g. number of contacts, shape of contacts, etc.) or cable entries for the components of the HV system to be checked or connected. A side part of the housing, for example, can be provided as an interchangeable housing part in which a connection unit is integrated.

A practical embodiment of the measuring device according to the invention provides that at least one of the connection units is designed as a universal connection unit which has a universal plug. This can then ideally be adapted to increased requirements with regard to plug-in cycles, line contacts, etc.

In a preferred development of the measuring device according to the invention, the connection units are designed to connect a signal line via which one of the connectable components of the HV system transmits signals. The housing then has at least one signal connection socket via which the signals transmitted by one of the connectable components of the HV system can be forwarded to an external test unit.

Short description of the characters

• 1 eine Ausführungsform der erfindungsgemäßen Messvorrichtung,
• 2 eine weitere Ausführungsform der erfindungsgemäßen Messvorrichtung, und
• 3 eine weitere Ausführungsform der erfindungsgemäßen Messvorrichtung mit zusätzlichen Signalanschlüssen.

The present invention is described below with reference to the 1 to 3 which show exemplary, schematic and non-limiting advantageous embodiments of the invention.

• 1 an embodiment of the measuring device according to the invention,
• 2 a further embodiment of the measuring device according to the invention, and
• 3 a further embodiment of the measuring device according to the invention with additional signal connections.

Implementation of the invention

1 shows a measuring device 1 according to the invention for recording electrical measured variables, in particular a voltage and/or a current, of components to be tested in the high-voltage system or HV system of an electrified vehicle, for example during a test in the course of vehicle development or for checking the HV system during a service case in a workshop. The measuring device 1 has a housing 2. The measuring device 1 also has two connection units 3, 4. The measuring device 1 can be electrically connected to the HV system or to components of the HV system via the connection units 3, 4. For this purpose, for example, a first connection unit 3 can be connected to a first component of the HV system (e.g. battery, electric drive, voltage converter, DC-DC converter, OBC, pump, heating element, etc.) via a connection cable or a housing plug. A second connection unit 4 can also be connected to a second component of the HV system (e.g. battery, electric drive, voltage converter, DC-DC converter, OBC, pump, heating element, etc.) via another connection cable or a housing plug. The measuring device 1 can be installed, for example, instead of an existing electrical connection between the components or in addition to an existing electrical connection between the components for a respective measuring application (e.g. determining absence of voltage, insulation testing, etc.).

In the exemplary embodiment shown, each of the two connection units 3, 4 has at least three connection contacts K1, K2, K3, K4, S1, S2 for an electrically conductive connection of the respective connection cable or the connected component of the HV system to the measuring device 1. The connection contacts K1, K2 of the first connection unit 3 serve to establish a connection to a positive or negative conductor of the connection cable or the connected component. The connection contact S1 of the first connection unit 3 establishes a connection to the shielding 73 of the connection cable or the connected component. Similarly, the connection contacts K3, K4 of the second connection unit 4 establish the connection to a positive or negative conductor of the further connection cable or the further component connected to the measuring device 1, and the connection contact S2 establishes the connection to the shielding 74 of the further connection cable or the further component connected to the measuring device 1. The connection contacts S1 and S2 are connected to one another via a shielding cable 7.

The connection units 3, 4 can be designed or assembled depending on the measurement application or to suit the respective connected component of the HV system. Ideally, each of the two connection units 3, 4 has at least one or more connection plugs, which are designed to suit the respective component or the associated connection cable and provide the corresponding connection contacts K1, K2, K3, K4, S1, S2. Alternatively, the associated connection cable can be connected directly to both connection units 3, 4 or just to one of the connection units 3, 4 via cable entries. The connection cable is then connected to the corresponding connection contacts K1, K2, K3, K3, S1, S2 within the respective connection unit or the measuring device 1.

The connector plug(s) of the respective connection unit 3, 4 can be adapted to a cable type of the connection line (e.g. shielded single-core connection cable for positive or negative conductors, shielded two-core connection cable which has both positive and negative conductors, etc.), to a component-specific housing plug of the respective component to be connected, etc. and have the required number of connection contacts K1, K2, K3, K4, S1, S2 for the conductors which are at least temporarily live when used as intended, and the shielding of the connection line. Furthermore, a corresponding number of additional connection contacts P1, P2, P3, P4 and corresponding connector plugs for one or more signal lines can be provided in the connection unit 3, 4. In 1 For the sake of simplicity, no connection contacts P1, P2, P3, P4 for a signal line and corresponding, associated connecting lines 15 are shown.

In order to be able to adapt the measuring device 1 to the respective components to be connected in a simple and flexible manner, the connection units 3, 4 of the measuring device 1 are ideally designed to be interchangeable. This means that - depending on the measuring application and/or the component of the HV system to be connected - component-specific adapted connection units 3, 4 can be used in the measuring device 1. The component-specific adapted connection units 3, 4 can provide the appropriate number of connection contacts K1, K2, K3, K4, S1, S2 for the conductors, which are at least temporarily live when used as intended, and the shielding, the appropriate number of connection contacts P1, P2, P3, P4 for a signal line and at least one suitable connection plug with these connection contacts for the respective component to be connected and/or the connection line of the component. For this purpose, the respective connection units 3, 4 can each be integrated, for example, into a housing part, such as a side part of the housing 2 of the measuring device 1, wherein the housing part and thus the respectively integrated connection unit 3, 4 can be exchanged depending on the required design. The first connection unit 3 can, for example, be integrated into a first housing part of the housing 2 of the measuring device 1. The second connection unit 4 can then, for example, be mounted in a further housing part of the housing 2 of the measuring device 1, which in the exemplary embodiment shown is opposite the first housing part. This means that the first connection unit 3 is, for example, integrated into a first side part of the housing 2 and the second connection unit 4 is integrated into a second side part of the housing 2 opposite the first side part. Each of the two housing parts and thus the connection units 3, 4 integrated therein can then be removed independently of one another and replaced by housing parts with connection units 3, 4 that are configured to suit the respective components of the HV system to be connected or the associated connection cable. This means that the exchangeable housing part with the connection unit 3, 4 that has the appropriate connection plugs, the appropriate number of connection contacts K1, K2, K3, K4, S1, S2, etc. can always be attached to the measuring device 1.

However, at least one of the connection units 3, 4 can also be designed as a universal connection unit with a universal plug. The universal plug represents a specially designed connection unit 3, 4, which can be designed for increased requirements in terms of plug-in cycles (i.e. number of plug-in and unplug-in cycles), line contacting, etc., for example for a service concept in the area of maintenance and inspection of electrified vehicles. It is also possible for both connection units 3, 4 to be designed as universal connection units.

Within the housing 2 of the measuring device 1, the connection contacts K1, K2 of the first connection unit 3 are electrically connected to the connection contacts K3, K4 of the second connection unit 4 via lines 5, 6. The lines 5, 6 are at least temporarily live when the measuring device 1 is used as intended. A first line 5 connects, for example, a positive connection contact K1 (i.e. the connection contact K1 for the positive conductor) of the first connection unit 3 to a positive connection contact K3 (i.e. the connection contact K1 for the positive conductor) of the second connection unit 4. The first line 5 can therefore also be referred to as a positive line 5. A second line 6 connects, for example, a minus connection contact K2 (ie the connection contact K2 for the minus conductor) of the first connection unit 3 with a minus connection contact K4 (ie the connection contact K2 for the minus conductor) of the second connection unit 4. The second line 6 can therefore also be used as a minus line 6. Both at least temporarily current-carrying lines 5, 6 are still shielded within the connection units 3, 4, which in 1 is shown by way of example and schematically by the shielding 73, 74. At a transition from the respective connection unit 3, 4 to an interior of the measuring device 1 or in the interior of the measuring device, the shielding 73, 74 are separated. Within the measuring device 1, the shielding 73 present in the first connection unit 3 is connected via a shielding line 7 to the shielding 74 present in the second connection unit 4.

Within the measuring device 1, further connecting lines 15 can be provided, by means of which, for example, connection contacts P1, P2, P3, P4 for a signal line, which the connection units 3, 4 have, are electrically connected to one another - as in the 2 and 3 shown as an example.

Furthermore, the measuring device 1 has at least one connection socket 8, 9, 10 on an outside of the housing 2, in the illustrated embodiment three connection sockets 8, 9, 10, to which an external measuring unit, for example for voltage measurement, or a test unit for measuring measured values can be connected via suitable cables. A first connection socket 8 and a second connection socket 9 can each be connected to the first line 5 or to the second line 6 via a relatively high-resistance resistor 11 (e.g. 220 kOhm). A third connection socket 10 is connected to the shielding line 7.

Furthermore, the measuring device 1 or the housing 2 of the measuring device 1 has a cable feedthrough 12. This cable feedthrough 12 represents a part of the housing 2 and is designed in such a way that it can be completely encompassed from outside the measuring device 1, at least in sections. In particular, the cable feedthrough 12 is designed in such a way, at least in sections, that a clamp-on ammeter or a current clamp can be attached without cable intervention. In the 1 In the measuring device 1 shown, the housing 2 has, for example, two projections 13 on one side of the housing, which are connected by the cable duct 12. The cable duct 12 therefore resembles a handle, for example. However, other designs of the cable duct 12 are also conceivable, such as a loop shape, eyelet shape, etc. - provided that it can be completely grasped from outside the measuring device 1 or a clamp ammeter can be attached without touching the cable. For safety reasons, the cable duct 12 is at least singly insulated. In order to achieve greater safety for a user (e.g. protection class II), the cable duct 12 can also be doubly insulated.

Since the shields 73, 74 of the two lines 5, 6 that are at least temporarily live when the measuring device 1 is used as intended are separated at the transition from the respective connection unit 3, 4 into the measuring device 1, the two lines 5, 6 in the interior of the measuring device 1 or within the housing 2 of the measuring device 1 each have at least one section 14 that is not enclosed by a shield 73, 74 or is separated from the shielding line 7. At least part of the unshielded section 14 of at least one of the two lines 5, 6 that are at least temporarily live when the measuring device 1 is used as intended is arranged in the cable feedthrough 12. In 1 For example, at least part of the section 14 of the positive line 5 is arranged in the cable duct 12, so that the value of the current flowing in the positive line 5 can be measured very easily with a clamp ammeter, which is attached to the cable duct 12. The measured value of the current in the positive line 5 determined by the clamp ammeter is ideally not distorted by a shield current, since the part of the section 14 of the positive line 5 arranged in the cable duct 12 is unshielded.

In 2 A further embodiment of the measuring device 1 according to the invention is shown, wherein for features which are the same as in 1 , the reference symbols from the 1 In contrast to the one in 1 The variant of the measuring device 1 shown in 2 The measuring device 1 shown has connection units 3, 4 which, in addition to the connection contacts K1, K2, K3, K4 for the conductors of the connected component or the connection cable of the HV component that carry current at least temporarily when the measuring device 1 is used as intended, and the connection contacts S1, S2 for the shielding 73, 74 of the connected component or the connection cable of the HV component, also have connection contacts P1, P2, P3, P4 for a signal or pilot line. These connection contacts P1, P2, P3, P4 of the connection units 3, 4 are electrically connected in the measuring device 1 or within the housing 2 by means of connecting cables 15 so that, for example, signals can be transmitted through the measuring device 1.

Furthermore, the 2 illustrated embodiment of the measuring device 1, not the plus line 5, but the minus line 6 with at least part of the section separated from the shielding 73, 74 or the shielding line 7 14 in the cable duct 12. The current in the negative line 6 is then measured when a clamp ammeter is attached to the cable duct 12.

3 shows a further embodiment of the measuring device 1. In this variant, the connection units 3, 4 again have, in addition to the connection contacts K1, K2, K3, K4 for the current-carrying conductors of the connected component or the connection cable of the HV component and the connection contacts S1, S2 for the shielding of the connected component or the connection cable of the HV component, also contacts P1, P2, P3, P4 for the signal line, which can be connected to the measuring device 1. The connection contacts P1, P2, P3, P4 of the connection units 3, 4 are connected to one another in the measuring device 1 via connecting lines 15. However, the measuring device 1 now also has signal connection sockets 16, which are connected to the connecting lines 15 and thus to the signal line. The signal connection sockets 16 can be used, for example, to tap into a signal level (e.g. voltage, signal shape, etc.) to determine it. For this purpose, a test system can be connected to the signal connection sockets 16 via appropriate cables, for example in order to record and/or evaluate the signal transmitted on the signal line.

Furthermore, in the 3 Again, at least part of the unshielded section 14 of the positive line 5 of the measuring device 1 is guided in the cable duct 12. This means that in this embodiment, the positive line 5 is again used to determine the current measurement values of the current flowing through the measuring device 1. Alternatively, however, in this embodiment of the measuring device 1, the negative line 6 could also be guided through the cable duct 12 with at least part of the section 14 separated from the shielding 73, 74 or the shielding line 7 in order to be used for measuring the current in one of the lines 5, 6.

List of reference symbols

1

Measuring device

2

Housing

3

first connection unit

4

second connection unit

5

first line or plus line

6

second line or minus line

7

Shielding cable

73, 74

Shielding

8, 9, 10

Connection sockets for external measuring device or external test system

11

Resistance

12

Cable entry

13

Housing projection

14

unshielded section of one of the cables

15

Connecting cable for the signal line

16

Signal connection sockets for detecting the signal line

K1, K2, K3, K4

Connection contacts for current-carrying conductors

S1, S2

Connection contact for shielding

P1, P2, P3, P4

Connection contacts for a signal line

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 202019104478 U1 [0006]

Claims (9)

Measuring device (1) for detecting electrical measured variables of components to be tested of a high-voltage system of an electrified vehicle, wherein the measuring device (1) has a housing (2), wherein the measuring device (1) further has at least two connection units (3, 4) via which the components of the high-voltage system to be tested can be connected to the measuring device (1) and which are electrically connected to one another by means of lines (5, 6) which run at least partially in the housing (2) of the measuring device (1) and which at least temporarily carry current when the measuring device (1) is used as intended, and at least one shielding line (7), characterized in that at least one of the lines (5, 6) which at least temporarily carry current when the measuring device (1) is used as intended has at least one section (14) within the housing (2) which is guided separately from the shielding line (7), wherein the housing (2) has an insulated cable feedthrough (12) and at least part of the A section (14) of one of the lines (5, 6) which is at least temporarily current-carrying when the measuring device (1) is used as intended is arranged in the cable duct (12) as a section (14) which is guided separately from the shielding line (7), and wherein the cable duct (12) is designed such that it can be completely encompassed from outside the measuring device (1), at least in sections. Measuring device (1) according to Claim 1 , characterized in that the cable feedthrough (12) is designed at least in sections such that a clamp current meter can be attached. Measuring device according to Claim 1 or 2 , characterized in that the housing (2) has at least one connection socket (8, 9, 10) for connecting an external measuring or testing unit. Measuring device (1) according to one of the Claims 1 until 3 , characterized in that the cable bushing (12) has double insulation. Measuring device (1) according to one of the Claims 1 until 4 , characterized in that the cable feedthrough (12) is designed like a handle or eyelet or loop. Measuring device (1) according to one of the preceding claims, characterized in that the connection units (3, 4) are designed to be exchangeable. Measuring device (1) according to one of the Claims 1 until 6 , characterized in that the connection units (3, 4) are each integrated into a housing part of the housing (2), wherein preferably a respective housing part is exchangeable. Measuring device (1) according to one of the preceding claims, characterized in that at least one of the connection units (3, 4) is designed as a universal connection unit. Measuring device (1) according to one of the preceding claims, characterized in that the connection units (3, 4) are designed to connect a signal line via which one of the connectable components of the high-voltage system transmits signals, wherein the housing (2) has at least one signal connection socket (16) via which the signals transmitted by one of the connectable components of the high-voltage system can be forwarded to an external test unit.

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