• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a differential protection device for the detection of leakage current or fault in an electrical installation powered by at least one phase conductor forming the primary of a toroid (T), the signal induced at the level of secondary (S) of said toroid (T), when a differential fault occurs at said primary, being operated by at least one signal processing stage (ETS) adapted from said device to, in case of exceeding of a predefined threshold value, to control a relay (MC) of the device, the said stage (s) (ETS) being connected (s) directly or indirectly to the terminals of the secondary (S) considered, device characterized in it comprises at least one RC circuit, formed of a first resistor (R) with a determined value and a first capacitance (C) with a determined value connected together in series, said RC circuit being connected to the terminals of said secondary (S) and mounted e n parallel and upstream from the signal processing stage or stages (ETS).
    公开号:FR3043270A1
    申请号:FR1560380
    申请日:2015-10-29
    公开日:2017-05-05
    发明作者:Hichem Chetouani
    申请人:Hager Electro SAS；
    IPC主号:
    专利说明:

    DESCRIPTION
    The present invention relates to equipment and systems for the safety of goods and persons in the electrical field, more particularly the devices for protecting people with residual current (or DDR), and relates to a differential protection device incorporating a cut-off function. -traffic light.
    This type of protection device is commonly integrated in domestic or tertiary electrical installations, upstream or at the entrance of the various trees of the power supply circuits in place, see closer to the receivers to which they are respectively affected.
    Typically, these electrical installations are powered by an alternating electrical network, and protection devices of the aforementioned type are intended primarily to ensure the safety of people by detecting as soon as possible any possible leak to the earth in one of the circuits or receivers. to protect. Such leaks are caused for example by direct contact of subjects with a non-insulated conductor or indirect contacts due to mass defects. These electrical incidents are likely to generate accidents, sometimes fatal, deterioration of equipment (s), fire starts, localized or generalized dysfunctions or the like.
    Differential protection, in the aforementioned context, is carried out in most cases in a fairly standardized manner: the conductors of the circuit to be protected, or the conductors of the supply line of this circuit, pass in a torus of material ferromagnetic transformer whose aforementioned conductors form the primary and which comprises one or more winding (s) or secondary winding (s). The torus plays the role of a magnetic flux concentrator. Thus, in the event of a leak, resulting in an imbalance of the input and output currents in the conductors of the lines to be protected, the flux created in the toroid by this imbalance at the primary level induces a voltage in the secondary winding, used to control directly, or through dedicated electronics (signal processing stages), an actuator (for example relay type). The latter in turn activates a trigger mechanism, cutoff or opening associated, or those of other protective devices of the installation.
    These devices or electrical devices for differential protection may have variable characteristics. Thus, they are differentiable and characterized by their own sensitivity, which depends in particular on the type of electrical installation in which they are used and that they are intended to protect. Moreover, some of these devices are only capable of detecting leaks for AC currents while others, more complete, offer solutions that are also applicable to pulsed DC (types A and F) and smoothed ( type B).
    A type B device is for example described in the French patent application No. 2 993 058 in the name of the applicant.
    Furthermore, for devices having the ability to detect alternative fault currents, the upper limit detection frequency is another criterion for distinguishing between the different types: frequencies up to 1 kHz: type F; frequencies up to 2kHz: type B; frequencies up to 20kHz: type B +.
    In particular, the type B + is, relative to the other types, specifically sensitive to fault current or leakage currents suitable for starting fire.
    Currently, the existing solutions to reach the frequency mask required for a type B + classification are mainly of two types: - implementation of an active electronic assembly making corrections adapted to the bandwidth of the sensitivity curve to the frequency of the fault current. A power failure of the electronic assembly transforms this type B + device into an A / AC type device only (the type F or type B functionalities are no longer fulfilled). - Implementation of an electronic relay to inhibit the type A / AC protection and its replacement by an active means performing the function AC, A, F and B.
    In the two aforementioned solutions, type B +, it leads to a complex construction, expensive and cumbersome based on the implementation of two independent circuits in parallel or in competition, the fire stop function being inoperative in case of absence of power supply.
    The present invention aims to overcome the disadvantages of the solutions mentioned above. For this purpose, it relates to a differential protection device for detecting leakage current or fault in an electrical installation powered by at least one phase conductor of a network and, where appropriate, a neutral conductor said network, at least one of said conductors constituting the primary of a torus ferromagnetic material provided with one or more secondary winding (s) across which or each of which establishes a signal induced during the occurrence of a differential defect at said primary, said induced signal being operated by at least one signal processing stage adapted to said device for, in case of exceeding a predefined threshold value, controlling an electromagnetic actuator, a relay or a means of cutting or similar opening of the device, said floor (s) being connected (s) directly or indirectly to the terminals of the secondary considered, disposit characterized in that it comprises at least one RC circuit, formed of a first resistance with a determined value and a first capacitance with a determined value connected together in series, said RC circuit being connected to the terminals of said secondary and mounted in parallel and upstream with respect to the stage or signal processing stages. The invention will be better understood, thanks to the following description, which refers to preferred embodiments, given by way of non-limiting examples, and explained with reference to the appended diagrammatic drawings, in which: FIGS. at 3 are symbolic representations of three different embodiments of the differential protection device according to the invention; FIG. 4 shows sensitivity curves in terms of the leakage current of the differential protection device according to the invention as a function of frequency, for different values of the resistance R of the series RC circuit forming part of the device represented on one of FIG. any of Figures 1 to 3; FIG. 5 represents a curve of the same nature as those represented in FIG. 4 for determined values of the capacitance C and the resistance R of the series RC circuit, and FIG. 6 is a curve of the variations of the impedance. total Z of the series RC circuit, the impedance Zc of the capacitance C and the impedance ZR of the resistor R as a function of the frequency, illustrating the relative contributions of each of the components Zc and ZR to the impedance Z.
    FIGS. 1 to 3 diagrammatically and partially show, according to three variant embodiments, a differential protection device enabling detection of leakage or fault current in an electrical installation powered by at least one phase conductor of a network and, where appropriate, optionally, by a neutral conductor of said network, at least one of said conductors constituting the primary of a torus T of ferromagnetic material provided with one or more secondary winding (s) S across which or each of which is established a signal induced at the occurrence of a differential defect at said primary. This induced signal is exploited by at least one ETS signal processing stage adapted from said device for, in the event of exceeding a predefined threshold value, controlling an electromagnetic actuator, a relay or a similar cutoff or opening means MC of the device, said (s) ETS stage (s) being directly connected or not to the terminals of the secondary S considered.
    According to the invention, the device further comprises at least one RC circuit formed of a first resistor R with a determined value and a first capacitor C with a determined value connected together in series, said RC circuit being connected to terminals of said secondary S and connected in parallel and upstream with respect to the stage or stages of ETS signal processing.
    Thus, the basic idea of the invention consists, by adding a series RC circuit, or even a simple resistor R when a capacitor C is already present, to provide a type A differential protection device, AC , F or B, an additional fire-resistant function not dependent on the power supply of said device.
    The inventive solution residing in the addition of a calibrated passive circuit for adapting the bandwidth of the device on which it is grafted to the frequency mask to achieve the firewall function has many advantages over the active solutions of the prior art: - not dependent on a possible mains supply; - no significant additional consumption; - negligible additional cost; - no dysfunction related to aging; - limited footprint; - No substantial complexity of the structure of the existing device on which is grafted the firewall function.
    As is apparent from FIGS. 4 and 6, it is advantageously provided that the first resistor R has a value such that its impedance is preponderant, in the series RC circuit, for induced signal frequencies greater than approximately 300 Hz, preferably greater than approximately 150 Hz.
    In accordance with a preferred embodiment of the invention, allowing the device in particular to comply with the regulations currently in force, and as graphically shown in FIG. 4, the first resistor R advantageously has a value such that the threshold value triggering for the high values of the frequency of the induced signal, typically between 1 kHz and 20 kHz, is at most equal to 420 mA.
    FIGS. 4 and 5 show graphically on the curves (variation of the tripping threshold as a function of the frequency of the induced signal), that for frequencies greater than 100 Hz, the slope of the curve considered, before its inflection to tend towards a plateau for frequencies above 104 Hz, is given by the value of the first capacitance C, while the new of said plateau is given by the value of the first resistance R (see lines PE and PL in Figure 5).
    The curves of FIG. 4 illustrate, for their part, the influence of the value of the first resistance R on the general shape (absence of a plateau for R = 0 / presence of a plateau for R # 0) or on the precise conformation of parts (different plateau values after about 1000 Hz, depending on the value of the first resistance R) of the threshold / frequency curve.
    Figure 6, finally, illustrates for R = 8.2 x 103Ω and C = 68 x 10'9 F, the evolution curve of the impedance Z of the series RC circuit. We can note the asymptotic shape of the curve which tends towards the value of the resistance R for the high frequencies, the resistance R becoming preponderant with respect to the impedance of the capacitance C from about 300 Hz. Those skilled in the art understand that, in addition to the aforementioned RC circuit, other components, in particular passive protection, adaptation, transformation or similar components, may be mounted between the terminals of the secondary S and the stage or stages. (s) ETS.
    Various non-limiting embodiments of a differential protection device according to the invention emerge from FIGS. 1 to 3.
    The simplest embodiment, without any additional component, is illustrated in FIG.
    With respect to this elementary construction, it may be provided that the device further comprises: at least one second resistor R connecting the terminals of the secondary S and connected in parallel with the series RC circuit, said components R, C, R thus constituting mutually interleaved serial and parallel RC circuits and / or - at least a second capacitor C 'connecting the terminals of the secondary S and connected in parallel with the series RC circuit.
    Typical values for these components are, for example, R = 6.8 kOhm, R '= 200 kOhm, C = 27nF and C' = 1pF. These components R 'and C' have the function of setting the threshold of the device at about 50 Hz with a significant frequency impact for C 'when used.
    According to another characteristic of the invention and as shown in FIG. 3, the device may comprise, possibly in addition to at least one of the aforementioned components R 'and C', at least one other resistance R ", forming the case alternatively, a third resistor connected in series between one of the terminals of the secondary S on the one hand and the input of the ETS signal processing stage (s) on the other hand. whose value can for example be of the order of 1 kOhm, has the function of limiting the current to the secondary.
    In connection with the embodiment shown in FIG. 3, and in agreement with another characteristic, the device according to the invention may further comprise at least one of the following additional components mounted upstream of the ETS signal processing stage (s): - a diode DT of the Transil diode type, mounted between the terminals of the secondary S upstream of any other component connected to said secondary, - a voltage rectifier circuit CR, for example with diodes, mounted in parallel, preferably immediately upstream of the ETS signal processing stage (s).
    FIG. 3 details, in addition, the possible constituent functional components of the stage or stages ETS, this last one (s) realizing a function of differential protection of the type chosen in the group formed by the types A, AC, F and B.
    The present invention also relates to a differential switch, a differential circuit breaker and an isolation controller, each of which is characterized in that it incorporates at least one differential protection device according to the invention.
    Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.
    权利要求:
    Claims (11)
    [1" id="c-fr-0001]
    1. Differential protection device enabling detection of leakage or fault current in an electrical installation powered by at least one phase conductor of a network and, where appropriate, by a neutral conductor of said network, at least one one of said conductors constituting the primary of a torus (T) of ferromagnetic material provided with one or more secondary windings (S) (S) at or of which a signal induced during occurrence of a differential defect at said primary, said induced signal being operated by at least one signal processing stage (ETS) adapted from said device for, in case of exceeding a predefined threshold value, controlling an electromagnetic actuator , a relay or similar means of breaking or opening (MC) of the device, the said stage (s) (ETS) being connected (s) directly or indirectly to the terminals of the secondary (S) considered device characterized in that it comprises at least one RC circuit, formed of a first resistor (R) with a determined value and a first capacitance (C) with a determined value connected together in series, said RC circuit being connected to the terminals of said secondary (S) and connected in parallel and upstream with respect to the signal processing stage or stages (ETS).
    [2" id="c-fr-0002]
    2. Differential protection device according to claim 1, characterized in that the first resistor (R) has a value such that its impedance is preponderant, in the series RC circuit, for induced signal frequencies greater than about 300 Hz, preferably greater than about 150 Hz.
    [3" id="c-fr-0003]
    3. Differential protection device according to any one of claims 1 and 2, characterized in that the first resistor (R) has a value such that the trigger threshold value for the high values of the frequency of the induced signal, typically between 1kHz and 20 kHz, is at most equal to 420 mA.
    [4" id="c-fr-0004]
    4. Differential protection device according to any one of claims 1 to 3, characterized in that it comprises at least a second resistor (R ') connecting the terminals of the secondary (S) and connected in parallel with the RC circuit series, said components (R, C, R ') thus constituting mutually interleaved serial and parallel RC circuits.
    [5" id="c-fr-0005]
    5. Differential protection device according to any one of claims 1 to 4, characterized in that it comprises at least a second capacitor (C ') connecting the terminals of the secondary (S) and connected in parallel with the RC circuit series.
    [6" id="c-fr-0006]
    6. Differential protection device according to any one of claims 1 to 5, characterized in that it comprises at least one other resistor (R "), possibly forming a third resistor, connected in series between one of the secondary terminals (S), on the one hand, and the input of the signal processing stage (s) (ETS), on the other hand.
    [7" id="c-fr-0007]
    7. Differential protection device according to any one of claims 1 to 6, characterized in that it further comprises at least one of the following additional components, mounted (s) upstream of the stage (s) of signal processing (ETS): - a diode (DT) of the Transil diode type, mounted between the terminals of the secondary (S) upstream of any other component connected to said secondary, - a circuit (CR) voltage rectifier, for example to diodes, connected in parallel, preferably immediately upstream of the signal processing stage (s) (ETS).
    [8" id="c-fr-0008]
    8. Differential protection device according to any one of claims 1 to 7, characterized in that the stage or the signal processing stages (ETS) performs (s) a differential protection function of the type chosen in the group formed by types A, AC, F and B.
    [9" id="c-fr-0009]
    9. Differential switch, characterized in that it incorporates at least one differential protection device according to any one of claims 1 to 8.
    [10" id="c-fr-0010]
    10. Differential circuit breaker, characterized in that it incorporates at least one differential protection device according to any one of claims 1 to 8.
    [11" id="c-fr-0011]
    11. Isolation controller, characterized in that it incorporates at least one differential protection device according to any one of claims 1 to 8.
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3043270B1|2021-04-30|
    EP3300541B1|2021-03-10|
    AU2016345559A1|2018-05-17|
    CN108352702A|2018-07-31|
    WO2017072442A2|2017-05-04|
    AU2016345559B2|2021-01-21|
    WO2017072442A3|2017-06-22|
    EP3300541A2|2018-04-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19937061A1|1999-08-05|2001-02-08|Siemens Ag|Residual current device|
    FR2733374B1|1995-04-18|1997-06-06|Schneider Electric Sa|DIFFERENTIAL PROTECTION DEVICE SENSITIVE TO PULSED CURRENTS|
    DE19940344A1|1999-08-25|2001-03-01|Siemens Ag|Protective device, in particular residual current device|
    FR2993058B1|2012-07-05|2014-08-08|Hager Electro Sas|DEVICE FOR DIFFERENTIAL PROTECTION.|FR3067525B1|2017-06-08|2019-08-02|Hager-Electro Sas|DIFFERENTIAL PROTECTION DEVICE FOR DETECTING DEFAULT CURRENT|
    FR3067527B1|2017-06-08|2019-08-02|Hager-Electro Sas|DIFFERENTIAL PROTECTION DEVICE FOR DETECTING DEFAULT CURRENT|
    FR3067526B1|2017-06-08|2019-08-02|Hager-Electro Sas|DIFFERENTIAL PROTECTION DEVICE FOR DETECTING DEFAULT CURRENT|
    FR3073331A1|2017-11-07|2019-05-10|Hager-Electro Sas|DEVICE FOR DIFFERENTIAL PROTECTION WITH FILTERING OF THE CARRIER OF THE EXCITATION SIGNAL|
    FR3073330A1|2017-11-07|2019-05-10|Hager-Electro Sas|DIFFERENTIAL PROTECTION DEVICE USING THE RECTIFIED MEDIUM VOLTAGE|
    FR3083926B1|2018-07-12|2021-08-06|Hager Electro Sas|DIFFERENTIAL PROTECTION DEVICE|
    法律状态:
    2016-10-14| PLFP| Fee payment|Year of fee payment: 2 |
    2017-05-05| PLSC| Publication of the preliminary search report|Effective date: 20170505 |
    2017-10-19| PLFP| Fee payment|Year of fee payment: 3 |
    2018-10-23| PLFP| Fee payment|Year of fee payment: 4 |
    2019-10-24| PLFP| Fee payment|Year of fee payment: 5 |
    2020-10-21| PLFP| Fee payment|Year of fee payment: 6 |
    2021-10-25| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1560380A|FR3043270B1|2015-10-29|2015-10-29|DIFFERENTIAL PROTECTION DEVICE WITH A FIRE-RESISTANT FUNCTION|FR1560380A| FR3043270B1|2015-10-29|2015-10-29|DIFFERENTIAL PROTECTION DEVICE WITH A FIRE-RESISTANT FUNCTION|
    AU2016345559A| AU2016345559B2|2015-10-29|2016-10-25|Differential protection device with fire break function|
    CN201680063489.4A| CN108352702A|2015-10-29|2016-10-25|Differential protection device with fireproof partition function|
    PCT/FR2016/052776| WO2017072442A2|2015-10-29|2016-10-25|Differential protection device with fire break function|
    EP16809934.9A| EP3300541B1|2015-10-29|2016-10-25|Differential protection device with fire break function|
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