GB2527892A - Residual current protection apparatus with detection which is purely dependent on the power supply system voltage. - Google Patents
Residual current protection apparatus with detection which is purely dependent on the power supply system voltage. Download PDFInfo
- Publication number
- GB2527892A GB2527892A GB1506530.3A GB201506530A GB2527892A GB 2527892 A GB2527892 A GB 2527892A GB 201506530 A GB201506530 A GB 201506530A GB 2527892 A GB2527892 A GB 2527892A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detection circuit
- current
- power supply
- protection apparatus
- residual current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/332—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means responsive to dc component in the fault current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/347—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using summation current transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A residual current protection device for monitoring a power supply, comprising two detection circuits 25 and 28, transformer 22, and tripping device 26. The first detection circuit measures alternating current (AC) components. The second detection circuit 28 measures an impedance across a secondary coil 24 of the core balance current transformer 22, and drives the tripping device 26 depending on the measurement result. The second detection circuit 28 can detect direct current (DC) as well as alternating current. The device may include a switchover device 27 to alternately connect the two detection circuits to the transformer, and the two detection circuits may be controlled by a common microprocessor 31.
Description
Intellectual Property Office Application No. GB1506530.3 RTM Date:15 October 2015 The following terms are registered trade marks and should be read as such wherever they occur in this document: Bluetooth' -page 1 line 2 Intellectual Property Office is an operating name of the Patent Office www.gov.uk/ipo
Description
Residual current protection apparatus with detection which is purely dependent on the power supply system voltage The present invention relates to a residual current protection apparatus for monitoring a power supply system, comprising a housing, a core balance current transformer in the housing for delivering a sum current from the power supply system, a first detection circuit, which is incorporated into the housing, for detecting the sum current, and a tripping device which is likewise incorporated into the housing and is driven by the first detection circuit.
Residual current (Fl) protection devices (also called residual current circuit breakers) are used for personal and fire protection in load installations. Residual current circuit breakers for earth leakage currents or technical stray currents, also called RCDs (Residual Current Devices), are circuit breakers which monitor the electrical circuit in order to detect and disconnect electrical faults (installation faults or protection in the event of direct contact) in installations.
Since different residual currents (direct currents and alternating currents of all kinds) are intended to be detected by residual current circuit breakers, a distinction is made between different types of residual current circuit breakers.
For example, residual current circuit breakers or residual current protection apparatuses of the AC type are used only to detect sinusoidal alternating residual currents. Residual current protection apparatuses of the A type also detect pulsed direct residual currents in addition to sinusoidal alternating residual currents. Furthermore, residual current protection apparatuses of the F type additionally detect residual currents which are made up of a mixture of freguencies up to 1 kHz.
Finally, residual current protection apparatuses of the B type also serve to detect smooth direct residual currents in addition to detecting the residual current forms cf the F type, that is to say they are sensitive to all currents. Detecting direct residual currents generally requires an additional core balance current transformer and an electronics unit which requires a separate power supply. Therefore, residual current circuit breakers of the B type are dependent on the power supply system voltage.
Residual current circuit breakers, for example of the A or F type, which are independent of the power supply system voltage have the basic design according to figure 1. A core balance current transformer 1 which is independent of the power supply system voltage detects a sum current from a plurality of lines (for example phase lines Li, L2, L3 and neutral line N in a three-phase system) which form the primary side 2 of the core balance current transformer 1. A typically annular core is symbolized as a linear transformer core 3 in figure 1. The secondary side 4 of the core balance current transformer 1 is usually formed by a coil around the annular transformer core 3.
The output signal from the secondary side 4 represents the sum current and is supplied to a tripping device circuit or detection circuit 5. This is usually formed by a flat assembly.
The detection circuit 5 detects an amplitude of the alternating current and produces a tripping signal when the alternating current amplitude exceeds a rated current limit. A holding magnet or a tripping device 5 is controlled by the output signal from the detection circuit 5. said tripping device 6 interrupts the current-carrying power supply system lines in the event of tripping, that is to say an excessively high sum current.
Figure 2 shows a basic circuit diagram of a conventional B-type residual current circuit breaker which is dependent on the power supply system voltage. The upper part of the circuit comprising the first core balance current transformer 1, the first detection circuit 5 which is connected to it, and the tripping device 6 corresponds to the design of figure 1. The components 1 to 5 are also called the Fl part.
In parallel with this Fl part which is independent of the power supply system voltage, the B-type residual current circuit breaker has a DI part (differential current) which is dependent on the power supply system voltage. Said DI part comprises a core balance current transformer II which is dependent on the power supply system voltage and has a primary side 12, core balance current transformer core 13 and secondary side 14. The secondary side 14 is excited by pulses which are generated by an electronics system, not illustrated in any detail. A corresponding power supply system voltage supply is reguired for this purpose. A second detection circuit 15, which is typically of digital design, adjoins the secondary part 14 so as to exchange signals with it. Said second detection circuit serves to identify a direct residual current from the signal from the second core balance current transformer 11 and to send a corresponding tripping signal to the tripping device 6. The residual current circuit breaker is therefore able not only to identify an alternating residual current, but also a direct residual current, and to ensure corresponding interruption.
The object of the present invention is to provide a residual current protection apparatus which is as flexible and accurate as possible.
According to the invention, this object is achieved by a residual current protection apparatus for monitoring a power supply system, comprising -a housing, -a core balance current transformer in the housing for delivering a sum current from the power supply system, -a first detection circuit, which is incorporated into the housing, for detecting the sum current, and -a tripping device which is likewise incorporated into the housing and is driven by the first detection circuit, wherein -the first detection circuit is dependent on the power supply system voltage, -a second detection circuit, which is incorporated into the housing and is dependent on the power supply system voltage, is connected to the core balance current transformer, -energy can be supplied to the first and the second detection circuit by a power supply unit which is incorporated into the housing, -the second detection circuit is designed to measure an impedance across a secondary coil of the core balance current transformer, and to drive the tripping device depending on the measurement result.
Therefore, the residual current protection apparatus according to the invention advantageously has two separate detection circuits which are each dependent on the power supply system voltage. In particular, one of the deteotion oircuits is suitable for measuring the impedance of a secondary coil of the core balance current transformer, this making it suitable for detecting direct currents. The second detection circuit then only has to detect alternating currents. The two-part design and the respective power supply system voltage supply produce an increased degree of flexibility, and this can be used, amongst other things, for greater accuracy.
In one exemplary embodiment, the first detection circuit is designed exclusively to detect alternating current components of the sum current. As a result, complicated excitation for the direct current detection can be dispensed with in this first detection circuit. Conseguently, a relatively more simple design of the first detection circuit can be selected.
The second detection circuit can be designed to denect direct current components and alternating current components of the sum current. This already produces a certain degree of redundancy since the first detection circuit will generally be designed at least for detecting alternating currents. A redundancy of this kind inoreases the detection reliability of the residual current protection apparatus.
As an alternative, the second detection circuit can also be designed exclusively to detect direct current components of the sum current. When the second detection circuit is designed only to detect direct currents, high exciter frequencies for detecting high-frequency alternating current components are not reguired. Instead, relatively low exciter freguencies are sufficient for pure direct current detection. Therefore, the design of the residual current protection apparatus can be selected to be structurally sinple. This is also advantageous in particular when the second detection circuit is designed for digital signal processing.
The first detection circuit is preferably designed in a partially analog manner. This means that the sum current signal from the core balance current transformer is processed in a substantially analog manner. The first detection circuit can then be controlled, for example, in a digital manner, an output signal likewise being provided in this way.
In a further advantageous refinement, the core balance current transformer is the only core balance current transformer in the housing, and a switchover device is arranged in the housing, said switchover device being designed to alternately connect the two detection circuits to the core balance current transformer. Therefore, in spite of the two detection circuits, a single transformer solution can be provided, this solution not only saving space but also being cost-effective.
Furthermore, the residual current protection apparatus can have a status indicator with which a representative of the measurement result of the second detection circuit can be indicated. The status indicator can be integrated in an indicator of a microprocessor control unit of the residual current protection apparatus. A status indicator of this kind may be a simple LED, but also a digital display or the like.
Said status indicator can be used to indicate, for example, whether the second detection oircuit has led to tripping of the residual current protection apparatus or not. In particular, said status indicator can also indicate which current component of the sum ourrent has led to tripping. In general, it is very important in the case of installations to be able to distinguish between whether a residual current or a stray current has led to tripping. In this case, the "representative of the measurement result" may be both the measurenent result itself and also, for example, a binary representation of said measurement result or another signal which is based on said measurement result. Alternative status indicators include flashing lighting means or numerical displays of measurement results.
Furthermore, the residual current protection apparatus can have an interface with which data relating to the measurement result from the second detection circuit can be transmitted from the housing to the outside. This has the advantage that the measurement data cannot only be recorded but also used for further data evaluation. In particular, further control operations on installations can be influenced by said measurement data. The first and the second detection circuit are expediently controlled by a common microprocessor. Owing to the common digital control, the entire design of the residual current protection apparatus with the two detection circuits, of which one may also be analog, can be selected in a simple manner.
The second detection circuit can be designed to measure an impedance across the tripping device, and to output a signal depending on the measurement result. This means that the second detection circuit can be used not only to monitor the core balance current transformer, but also to monitor the tripping device. Therefore, breaking of a wire can be detected in a simple manner both in the core balance current transformer and also in the tripping device.
In order to further simplify the residual current protection apparatus, the power supply unit of the second detection circuit may also have one phase. The costs of polyphase residual current protection apparatuses in particular can be reduced with a simple power supply unit cf this kind. If a simple threshold value function for direcu current identification is then also used at the same time, a very cost-effective residual current protection apparatus which is sensitive to all currents can be provided.
The present invention will now be explained in greater detail with reference to the appended drawings, in which: figure 1 shows a basic circuit diagram of a residual current circuit breaker, which is independent of the power supply system voltage, with alternating current
detection according to the prior art;
figure 2 shows a basic circuit diagram of a residual current circuit breaker, which is dependent on the power supply system voltage, with direct and alternating
current detection according to the prior art; and
figure 3 shows a basic circuit diagram of a residual current protection apparatus according to the invention for detecting direct current and alternating current with components which are purely dependent on the power supply system voltage.
The exemplary embodiments described in greater detail below constitute preferred embodiments of the present invention. It should be noted here that the described features can also be used in other combinations or else on their own, provided this is technically possible and it is not stated otherwise.
The residuai current protection apparatus illustrated by way of example in figure 3 has a housing 21 in which the fcllowing electronic components are incorporated.
In this case, the housing 21 in particular contairs a single core balance current transformer 22. said core balance current transformer has an annular transformer core 23 through which the power lines Ll, L2, L3 and N are routed. In this case, said lines are a three-phase system comprising the phase lines Li, L2 and L3 and also the neutral line N. It goes without saying that, as an alternative, said lines may be a single-phase system with only two lines, or may be any other polyphase system.
The power lines Ll, L2, L3 and N constitute the primary side of the core balance current transformer 22. The secondary side of the core balance current transformer is formed by a coil 24 which is wound around the annular core 23 on one side. The core balance current transformer 22 forms the vectorial sum of the currents in the power lines Li, L2, L3 and N and, on the secondary side, outputs a corresponding sum value.
A first detection circuit 25, which is dependent on the power supply system voltage and with which alternating currents can be detected, is coupled to the secondary-side coil 24 of the core balance current transformer. Therefore, if the sum current which is delivered by the coil 24 has an alternating current component, said alternating current component is detected by said first detection circuit 25. said first detection circuit usually has an amplifier and a filter in order to process the alternating current components. The first detection circuit can be of digital design, but it is preferably of analog design. At the end, the first detection circuit 25 delivers an output signal which is optionally still further processed by a microprocessor unit 31. However, the output signal from the first detection circuit 25 may already constitute a tripping signal for a tripping device 26. In this case, the microprocessor unit 31 is used to control the firsc detection circuit 25 and/or to coordinate the output signal from said first detection circuit. If the entire alternating current component or a spectral component of said alternating current component now exceeds a prespecified rated current limit, the first detection circuit 25 generates, possibly with the microprocessor unit 31, the abovementioned corresponding tripping signal for the tripping device 26.
The tripping device 26 can have, in particular, a holding magnet which is part of a relay. A relay of this kind is then usually designed to interrupt the power lines L1, L2, L3 and N in the case of tripping, as is illustrated in figure 3.
A switchover device 27 allows a second detection circuit 28, instead of the first detection circuit 25, to be connected to the secondary-side coil 24 of the single core balance current transformer 22. Tn this case, the second detection circuit 28 has a corresponding drive part for the switchover device 27.
However, said drive part can likewise be provided in the first detection circuit 25 or the microprocessor unit 31.
Furthermore, the second detection circuit 28 has a circuit part for exciting the secondary coil 24 for direct current detection. Furthermore, the second detection circuit 28 also has an amplifier and a filter and also an A/D converter for signal processing in this case. The task of the switchover device can also be performed by a matched filter stage, for example in the detection circuit 25.
The second detection circuit 28 is usually of digital design and is controlled by the microprocessor unit 31. The output signal from the second detection circuit 28, which is usually provided for direct current detection, may also be further processed in the microprocessor unit 31. Therefore, the microprocessor unit 31 can also generate the tripping signal for the tripping device 26 both on the basis of the output -10 -signal from the first detection circuit 25 and also on the basis of the output signal from the second detection circuit 28.
Like the first detection circuit 25, the second detection circuit 28 is also dependent on the power supply system voltage. This means that one power supply unit 29, which is incorporated into the housing 21, is provided for both detection circuits 25 and 28. Said power supply unit supplies power to the electronics system of the first detection circuit and to the electronics system of the second detection circuit 28, but also to further signal processing components of the residual current protection apparatus, if this is necessary. Therefore, by way of example, the microprocessor unit 31 or, for example, an interface 30 can be supplied with energy by the power supply unit 29.
In this case, the power supply unit 29 obtains its energy from the power lines TA, L2, L3 and N. As an alternative, said power supply unit is a single-phase power supply unit which taps off energy only from a single phase line.
The second detection circuit 28 requires the energy from the power supply unit 29 in order to excite the coil 24 for direct current detection. In the event of saturation of the transformer magnet 23 on account of a high direct current component in the sum current, the impedance of the coil 24 is independent of the exciter frequency. For the second detection circuit, this is an indication of the sum current containing a large direct current component, and the residual current protection apparatus therefore having to be tripped.
Accordingly, the second detection circuit 28 drives the tripping device 26 independently of the first detection circuit 25.
The optional interface 30 serves for data exchange between the residual current protection apparatus and the outside. The -11 -interface may be a cable connection or a cable-free interface (for example for WL\J or Bluetooth)t Up-to-date data relating to the measurements from the two detection circuits 25 and 28 or also simple state data (for example tripping signal "0" or "1") for external further processing can be provided via said interface 30. An interface 30 of this kind can also serve for bus coupling.
As an alternative or in addition to the interface, a status indicator 32 can be provided on the housing 21. Said status indicator can also indicate the status of the two detection circuits 25 and 28. If the status indicator is, for example, a single LED, different flashing modes could be used to distinguish between the residual currents.
The above structure results in a design of an active residual current circuit breaker or differential current circuit breaker DI of the B type with only one single transformer and one electromechanical or electronic switchover unit between the AC part (first detection circuit 25) and the DC part (second detection circuit 28) . Said circuit breaker is therefore a version, which is purely dependent on the power supply system voltage, for AC identification and DC identification together with microprocessor control.
Therefore, the AC part and DC part are preferably evaluated separately. The DC part expediently identifies at least the pure DC residual current. In this case, high sampling rates of the microprocessor unit and high exciter frequencies for DC identification are not required. This results in a cost-effective, space-saving design of the DC part, that is to say the second detection circuit 28. Alternating current components in the sum current can also optionally be identified by the DC part, as a result of which an increase in the redundancy in tripping reliability can be achieved.
-12 -The AC part, that is to say the first detection circuit 25, should identify at least the spectral remainder in the sum current. Realizing residual current identification for high frequencies up to at least 100 kHz or more does not present a problem, at least when analog technology is used in the AC part. Therefore, since analog technology can be at least partially used, a simple and cost-effective design of the residual current protection apparatus can be achieved.
Therefore, a residual current circuit breaker with the conventional circuit technology of an Fl, paired with an active electronics system, microprocessor and operational amplifier etc. can be realized overall. Complete control/monitoring of the AC part and DC part by the microprocessor unit, including the solution which is purely dependent on the power supply system voltage, of this kind ensures maximum flexibility, accuracy and functionality (additional functions) -13 -List of reference symbols 1 Core balance current transformer 2 Primary side 3 Transformer core 4 Secondary side Detection circuit 6 Tripping device 11 Core balance current transformer 12 Primary side 13 Transformer core 14 Secondary side Detection circuit 21 Housing 22 Core balance current transformer 23 Transformer core 24 Coil Detection circuit 26 Tripping device 27 Switchover device 28 Detection circuit 29 Power sllpply unit Interface 31 Microprocessor unit 32 Status indicator Li, L2, L3 Phase line N Neutral conductor
Claims (10)
- -14 -Patent claims 1. A residual current protection apparatus for monitoring a power supply system, comprising -a housing (21), -a core balance current transformer (22) in the housing (21) for delivering a sum current from the power supply system, -a first detection circuit (25) , which is incorporated into the housing (21) , for detecting the sum current, and -a tripping device (26) which is likewise incorporated into the housing (21) and is driven by the first detection circuit (25), characterized in that -the first detection circuit (25) is dependent on the power supply system voltage, -a second detection circuit (28), which is incorporated into the housing (21) and is dependent on the power supply system voltage, is connected to the core balance current transformer (22), -energy can be supplied to the first and the second detection circuit (28) by a power supply unit which is incorporated into the housing (21) -the second detection circuit (28) is designed to measure an impedance across a secondary coil (24) of the core balance current transformer (22) , and to drive the tripping device (26) depending on the measurement result.
- 2. The residual current protection apparatus as claimed in claim 1, wherein the first detection circuit (25) is designed exclusively to detect alternating current components of the sum current.
- 3. The residual current protection apparatus as claimed in claim 1 or 2, wherein the second detection circuit (28) is designed to detect direct current components and alternating current components of the sum current.-15 -
- 4. The residual current protection apparatus as claimed in claim 1 or 2, wherein the seoond detection circuit (28) is designed exclusively tc detect direct current components cf the sum current.
- 5. The residual current protection apparatus as claimed in one of the preceding claims, wherein the first detection circuit (25) is designed in a partially analog manner.
- 6. The residual current protection apparatus as claimed in one of the preceding claims, wherein the core balance current transformer is the only core balance current transformer in the housing, and a switchover device (27) is arranged in the housing (21), said switchover device being designed to alternately connect the two detection circuits (25, 28) to the core balance current transformer (22)
- 7. The residual current proteotion apparatus as olaimed in one of the preceding claims, which has a status indicator with which a representative of the measurement result of the second detection circuit (28) can be indicated.
- 8. The residual current protection apparatus as claimed in one of the preceding claims, wherein the first and the seoond detection circuit are controlled by a common microprocessor.
- 9. The residual current protection apparatus as claimed in one of the preceding claims, wherein the second detection circuit (28) is designed to measure an impedance across the tripping device (26) , and to output a signal depending on the measurement result.
- 10. The residual current protection apparatus as claimed in one of the preceding claims, wherein the power supply unit of the second detection circuit (28) has one phase.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014213052 | 2014-07-04 | ||
| DE102014221658.3A DE102014221658B4 (en) | 2014-07-04 | 2014-10-24 | Residual current device with purely mains voltage dependent detection |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201506530D0 GB201506530D0 (en) | 2015-06-03 |
| GB2527892A true GB2527892A (en) | 2016-01-06 |
| GB2527892B GB2527892B (en) | 2021-09-08 |
Family
ID=53298733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1506530.3A Active GB2527892B (en) | 2014-07-04 | 2015-04-17 | Residual current protection apparatus with detection which is purely dependent on the power supply system voltage. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2527892B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2620766A (en) * | 2022-07-20 | 2024-01-24 | Eaton Intelligent Power Ltd | Residual current breaker with improved resistance against DC saturation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112398085A (en) * | 2020-11-09 | 2021-02-23 | 贵州电网有限责任公司 | Novel high-sensitivity residual current protection device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2177560A (en) * | 1985-05-02 | 1987-01-21 | Bbc Brown Boveri & Cie | A fault-current protective switch for a c and d c fault currents without energy storage |
| EP0349880A1 (en) * | 1988-07-07 | 1990-01-10 | Siemens Aktiengesellschaft | Fault current protection device |
| US20140022686A1 (en) * | 2011-04-01 | 2014-01-23 | Eaton Industries (Austria) Gmbh | Residual-current circuit breaker |
| WO2014104982A1 (en) * | 2012-12-24 | 2014-07-03 | Razvojni Center Enem Novi Materiali D.O.O. | Electronic device for residual current circuit breakers of type b and its derivative |
| WO2015139655A1 (en) * | 2014-03-21 | 2015-09-24 | 上海电科电器科技有限公司 | Residual current protection device |
-
2015
- 2015-04-17 GB GB1506530.3A patent/GB2527892B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2177560A (en) * | 1985-05-02 | 1987-01-21 | Bbc Brown Boveri & Cie | A fault-current protective switch for a c and d c fault currents without energy storage |
| EP0349880A1 (en) * | 1988-07-07 | 1990-01-10 | Siemens Aktiengesellschaft | Fault current protection device |
| US20140022686A1 (en) * | 2011-04-01 | 2014-01-23 | Eaton Industries (Austria) Gmbh | Residual-current circuit breaker |
| WO2014104982A1 (en) * | 2012-12-24 | 2014-07-03 | Razvojni Center Enem Novi Materiali D.O.O. | Electronic device for residual current circuit breakers of type b and its derivative |
| WO2015139655A1 (en) * | 2014-03-21 | 2015-09-24 | 上海电科电器科技有限公司 | Residual current protection device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2620766A (en) * | 2022-07-20 | 2024-01-24 | Eaton Intelligent Power Ltd | Residual current breaker with improved resistance against DC saturation |
| GB2620766B (en) * | 2022-07-20 | 2024-10-23 | Eaton Intelligent Power Ltd | Residual current breaker with improved resistance against DC saturation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2527892B (en) | 2021-09-08 |
| GB201506530D0 (en) | 2015-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8593150B2 (en) | Method and apparatus for detecting a location of ground faults in a motor/motor drive combination | |
| CN113161995B (en) | Apparatus and method for fault current detection | |
| CN1855341B (en) | Leakage circuit cutout | |
| AU2012286930B2 (en) | System for measuring current and method of making same | |
| US20090085759A1 (en) | High voltage indication system | |
| US11009557B2 (en) | Method and device for short-circuit monitoring of a three-phase load | |
| JP5661231B2 (en) | Clamp meter and DC ground fault circuit search method | |
| WO2015075815A1 (en) | Electronic circuit breaker | |
| JP4935455B2 (en) | Earth leakage detector | |
| US20200185903A1 (en) | Arc discharge detection device | |
| CN105305378B (en) | Fault current protection device with the relevant and unrelated detection of network voltage | |
| CN105244855A (en) | Residual Current Device with a purely voltage-dependent detection | |
| GB2527892A (en) | Residual current protection apparatus with detection which is purely dependent on the power supply system voltage. | |
| JP2008186592A (en) | Circuit breaker | |
| CN100495848C (en) | Device and method for the differential protection and electrical apparatus including such a device | |
| JP2008136282A (en) | Distribution board | |
| JP6305044B2 (en) | Power measuring apparatus and power measuring method | |
| RU2392654C2 (en) | Device for automatic control over bridge thyristor rectifier | |
| KR101414929B1 (en) | Voltage indicator controller of switchboard | |
| KR101287173B1 (en) | Ground monitor | |
| CN108281331B (en) | Three-phase undervoltage tripping device and molded case circuit breaker with same | |
| EP2477293A2 (en) | Methods and systems involving monitoring circuit connectivity | |
| EP4133289B1 (en) | Energy metering and surge current detection | |
| JPH11337590A (en) | Direct current detecting device | |
| EP3526870B1 (en) | A liquid system tool having an integrated residual current device |