WO2024046723A1 - Disjoncteur et procédé - Google Patents

Disjoncteur et procédé Download PDF

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Publication number
WO2024046723A1
WO2024046723A1 PCT/EP2023/071972 EP2023071972W WO2024046723A1 WO 2024046723 A1 WO2024046723 A1 WO 2024046723A1 EP 2023071972 W EP2023071972 W EP 2023071972W WO 2024046723 A1 WO2024046723 A1 WO 2024046723A1
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WO
WIPO (PCT)
Prior art keywords
current
differential current
low
limit values
unit
Prior art date
Application number
PCT/EP2023/071972
Other languages
German (de)
English (en)
Inventor
Marvin TANNHÄUSER
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2024046723A1 publication Critical patent/WO2024046723A1/fr

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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
    • H02H3/02—Details
    • H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
    • 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
    • H02H3/08—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 excess current
    • H02H3/10—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 excess current additionally responsive to some other abnormal electrical conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to undesired approach to, or touching of, live parts by living beings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/548—Electromechanical and static switch connected in series
    • 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
    • H02H3/02—Details
    • H02H3/027—Details with automatic disconnection after a predetermined time
    • 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
    • H02H3/08—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 excess current
    • H02H3/093—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 excess current with timing means
    • H02H3/0935—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 excess current with timing means the timing being determined by numerical means

Definitions

  • the invention relates to the technical field of a protective switching device for a low-voltage circuit with an electronic interruption unit according to the preamble of claim 1 and a method for a protective switching device for a low-voltage circuit with an electronic interruption unit.
  • Low voltage refers to voltages of up to 1000 volts AC or up to 1500 volts DC. Low voltage refers in particular to voltages that are greater than extra-low voltage, with values of 50 volts alternating voltage or 120 volts DC, are .
  • Low voltage circuit or network or system are circuits with rated currents or Rated currents of up to 125 amperes, specifically up to 63 amperes.
  • Low-voltage circuits are in particular circuits with rated currents or Rated currents of up to 50 amps, 40 amps, 32 amps, 25 amps, 16 amps or 10 amps are meant.
  • the current values mentioned refer in particular to nominal, rated and/or switching off currents, i.e. H . the maximum current that is normally carried through the circuit or in which the electrical circuit is usually interrupted, for example by a protective device such as a protective switching device, circuit breaker or circuit breaker.
  • the nominal currents can be further staggered, from 0.5 A to 1 A, 2 A, 3 A, 4 A, 5 A, 6 A, 7 A, 8 A, 9 A, 10 A, etc. up to 16 A.
  • Circuit breakers have long been known overcurrent protection devices that are used in electrical installation technology in low-voltage circuits. These protect cables from damage caused by heating due to excessive current and/or short circuits.
  • a Circuit breaker can automatically switch off the circuit in the event of overload and/or short circuit.
  • a circuit breaker is a non-automatically resetting safety element.
  • circuit breakers In contrast to circuit breakers, circuit breakers are intended for currents greater than 125 A, sometimes even from 63 amps. Circuit breakers are therefore designed to be simpler and more delicate. Circuit breakers usually have a mounting option for mounting on a so-called top-hat rail (mounting rail, DIN rail, TH35).
  • Circuit breakers according to the state of the art are built electromechanically. In a housing they have a mechanical switching contact or Shunt release for interrupting (tripping) the electrical current. Usually a bimetal protective element or Bimetal element used for tripping (interruption) in the event of long-lasting overcurrent (overcurrent protection z) or in the event of thermal overload (overload protection z). An electromagnetic release with a coil is used for short-term triggering when an overcurrent limit or used in the event of a short circuit (short circuit protection). One or more arc quenching chamber(s) or Facilities for extinguishing arcs are provided. Furthermore, connection elements for conductors of the electrical circuit to be protected.
  • Residual current circuit breakers for electrical circuits are generally known. Residual current circuit breakers are also known as residual current devices, or RCD for short. Residual current circuit breakers determine the total current in an electrical circuit, which is normally zero, and interrupt it when a differential current value is exceeded, i.e. H . a current sum of non-zero, which exceeds a certain (difference) current value or fault current value, the electrical circuit. Almost all previous residual current circuit breakers have a summation current transformer whose primary winding is formed by the conductors of the circuit and whose secondary winding delivers the sum of current which is used directly or indirectly to interrupt the electrical circuit.
  • a fault occurs, for example, if there is an electrical connection from a phase conductor of the electrical circuit to ground. For example, if a person touches the phase conductor. Then part of the electrical current does not flow as usual via the neutral conductor or Neutral conductor returns, but via the person and the earth. This fault current can now be detected with the help of the summation current transformer, since the sum of the inflowing and returning current recorded in terms of amount is not zero. Via a relay or A holding magnet release, for example with connected mechanics, will interrupt the circuit, e.g. B. at least one, part or all lines. Residual current circuit breakers for detecting alternating residual currents are generally known from publication DE 44 32 643 Al.
  • the main function of residual current circuit breakers is to protect people from electrical currents (electric shock). as well as systems, machines or buildings from fire due to electrical insulation faults.
  • residual current circuit breaker or whose summation current transformer is designed in such a way that the secondary-side energy of the summation current transformer is used to actuate a tripping unit or an interruption unit or A trigger is sufficient then such residual current circuit breakers are called mains voltage independent.
  • mains voltage dependent residual current circuit breakers contain a power supply to supply energy for residual current detection (mains voltage independent ones do not). These power supplies are required, for example, to control residual currents in DC networks and mixed DC/AC networks. can be detected in circuits with high frequencies.
  • Protective switching devices with an electronic interruption unit are relatively new developments. These have a semiconductor-based electronic interruption unit. D. H .
  • the electrical current flow of the low-voltage circuit is routed via semiconductor components or semiconductor switches, which interrupt the electrical current flow. can be switched conductive.
  • Protective switching devices with an electronic interruption unit also often have a mechanical isolating contact system, in particular with isolating properties in accordance with relevant standards for low-voltage circuits, the contacts of the mechanical isolating contact system being connected in series to the electronic interruption unit, i.e. H .
  • the current of the low-voltage circuit to be protected is routed via both the mechanical isolating contact system and the electronic interruption unit.
  • the present invention relates in particular to low-voltage alternating current circuits, with an alternating voltage, usually with a time-dependent sinusoidal alternating voltage with the frequency f.
  • a harmonic alternating voltage can be represented by the rotation of a pointer whose length corresponds to the amplitude (U) of the voltage.
  • the instantaneous deflection is the projection of the pointer onto a coordinate system.
  • One period of oscillation corresponds to one full revolution of the pointer and its full angle is 2n (2Pi) or 360°.
  • the angular frequency is the rate of change of the phase angle of this rotating pointer.
  • the term instantaneous angular frequency is also used.
  • the time-dependent value from the angular velocity w and the time t corresponds to the time-dependent angle cp (t), which is also referred to as the phase angle cp (t). Ie the phase angle cp ( t ) periodically passes through the range O...2n or 0°...360°.
  • the object of the present invention is to improve a protective switching device of the type mentioned above, in particular to ensure protection against residual currents caused by people while at the same time reducing the burden on potentially affected people due to current avoidance processes of the protective switching device.
  • a protective switching device of the type mentioned above, in particular to ensure protection against residual currents caused by people while at the same time reducing the burden on potentially affected people due to current avoidance processes of the protective switching device.
  • a protective switching device for protecting an electrical low-voltage circuit, in particular a low-voltage alternating circuit, comprising:
  • a differential current sensor unit for determining the level of a differential current in the conductors of the low-voltage circuit
  • a mechanical isolating contact unit which has a closed state of the contacts for a current flow in the low-voltage circuit or an open state of the contacts for a current flow-avoiding galvanic isolation in the low-voltage circuit, the mechanical isolating contact unit can be operated and switched in particular by a mechanical handle, so that an opening of contacts to avoid a current flow or a closing of the contacts for a current flow in the low-voltage circuit can be switched (through the handle), thus (in particular) a galvanic isolation in the low-voltage circuit can be switched;
  • opening contacts is also referred to as disconnecting and closing contacts is referred to as switching on;
  • an electronic interruption unit which is connected in series on the circuit side to the mechanical isolating contact unit and which, through semiconductor-based switching elements, has a high-resistance (in particular non-conducting) state of the switching elements to avoid a current flow or a low-resistance state of the switching elements to prevent current flow in the low-voltage circuit;
  • a high-resistance (particularly non-conductive) state of the switching elements (to avoid current flow) is also called a switched-off state (process: switching off) and a low-resistance (conducting) state of the switching elements (for current flow) is also called a switched-on state (process: switching on). designated ;
  • the protective switching device in particular the control unit, is designed in such a way that if differential current limit values or differential current time limit values are exceeded (i.e.
  • a current flow in the low-voltage circuit is avoided high-resistance state of the switching elements electronic interruption unit is initiated when the isolating contacts are closed when the amount of the instantaneous value of the differential current falls below a differential current threshold value, in particular that the high-resistance state of the switching elements of the electronic interruption unit (with the isolating contacts closed) is initiated in the next zero crossing of the differential current.
  • any repercussions are caused by immediate current avoidance, in particular by the electronic interruption unit, which enables very fast current avoidance, for example in the (small) milliseconds or microseconds range , can be carried out, on people who may be involved, since current avoidance is carried out when the differential current levels are at least approximately non-reactive in terms of magnitude.
  • This is based on the assumption that in current avoidance processes (switching processes) with small currents through a human body, the current avoidance occurs almost without reaction, that is, for example, ventricular fibrillation is avoided, which could possibly occur more strongly due to an abrupt switch-off at high currents.
  • appropriate evaluation or processing can advantageously be carried out using the instantaneous value of the differential current.
  • only the mechanical isolating contact unit can be operated by the mechanical handle. Switching on and off using the electronic interruption unit cannot be operated (directly) on the device.
  • an effective value of the differential current is determined from the level of the determined instantaneous differential current.
  • the effective value of the differential current is compared with an (effective) differential current limit or (effective) differential current time limit and, if exceeded, prevention of current flow in the low-voltage circuit is initiated as suggested.
  • the instantaneous value of the differential current is used with regard to the exceedance of the differential current limit values or differential current time limit values. This has the particular advantage that a faster or (quasi-) Immediate shutdown occurs when the amount is exceeded, with current avoidance taking place immediately after a first reduction in the differential current.
  • a current sensor unit connected to the control unit is provided for determining the level of a current in the conductors of the low-voltage circuit.
  • the protective switching device in particular the control unit, is designed in such a way that when first current limit values or first current time limit values are exceeded, avoidance of a current flow in the low-voltage circuit is initiated by a high-resistance state of the switching elements of the electronic interruption unit when the isolating contacts are closed.
  • the current flow is avoided within a first period of time, which is in particular less than 1 ms, more specifically less than 100 ps or 10 ps.
  • the mechanical isolating contact unit is assigned to the load-side connections.
  • a corresponding method for a protective switching device for a low-voltage circuit with electronic (semiconductor-based) switching elements is claimed with the same and further advantages.
  • a corresponding computer program product for a protective switching device includes commands which, when the program is executed by a microcontroller, cause the microcontroller to implement the embodiments according to the invention or Procedure of the protective switching device to be carried out or to support .
  • differential current limit values or differential current time limit values when differential current limit values or differential current time limit values are exceeded, current flow in the low-voltage circuit is avoided by a high-resistance state of switching elements of an electronic interruption unit when isolating contacts are closed and the amount of the instantaneous value of the differential current falls below a difference reference current threshold is initiated.
  • the avoidance of the current flow is initiated at the next zero crossing of the differential current.
  • the microcontroller is part of the protective switching device, especially the control unit.
  • a corresponding computer-readable storage medium on which the computer program product is stored is claimed.
  • Figure 1 shows a first schematic diagram of a protective switching device
  • Figure 2 shows a second schematic diagram of a protective switching device.
  • Figure 1 shows a representation of a protective switching device SG for protecting an electrical low-voltage circuit, in particular a low-voltage alternating circuit, with a housing GEH, comprising:
  • - network-side connections which i. B. include a network-side neutral conductor connection NG and a network-side phase conductor connection LG,
  • - load-side connections which i. B. include a load-side neutral conductor connection NL and a load-side phase conductor connection LL,
  • an energy source is usually connected to the grid-side connections / the grid side GRID / is connected to an energy source
  • the load-side connection points APNL, APLL are connected to the load-side neutral and phase conductor connections NL, LL, so that an opening of contacts KKN, KKL to avoid a current flow or a closing of the contacts KKN, KKL to prevent a current flow in the low-voltage circuit can be switched.
  • electronic interruption unit EU (which in the case of a single-pole version is arranged in particular in the phase conductor) with a network-side connection point EUG, which is in electrical connection with the network-side phase conductor connection LG, and a load-side connection point EUL, which is connected to the network-side Connection point APLG of the mechanical isolating contact unit MK is in electrical connection or is connected, wherein the electronic interruption unit EU has a high-resistance state of the switching elements to avoid a current flow or a low-resistance state of the switching elements for current flow in the low-voltage circuit by means of semiconductor-based switching elements (not shown). is switchable,
  • the differential current sensor unit ZCT for determining the level of a (momentary) differential current of the conductors of the low-voltage circuit
  • the differential current sensor unit ZCT is arranged in the example between the electronic interruption unit EU and the mechanical isolating contact unit MK, it can alternatively be between mechanical Isolating contact unit MK and the load-side neutral and phase conductor connections NL, LL can be provided (arranged), as well as alternatively between the electronic interruption unit EU and be provided (arranged) at the network-side connections NG, LG.
  • the differential current sensor unit ZCT determines the magnitude of the differential current of the conductors of the low-voltage circuit (to be protected) that are routed through the protective switching device. In the example of a single-phase AC circuit with neutral conductor and phase conductor.
  • the differential current sensor unit ZCT can be a classic summation current transformer.
  • the primary side of the summation current transformer is formed by the conductors of the low-voltage circuit (in the example phase conductor and neutral conductor).
  • the secondary side of the summation current transformer is connected to the SE control unit.
  • a current sensor unit SI for determining the level of the current of the low-voltage circuit, which is arranged in particular in the current path of the phase conductor or phase conductor current path,
  • a first voltage sensor unit SUA for determining the level of the voltage of the low-voltage circuit, in particular the grid-side (GRID) voltage or the voltage in the area of the grid-side connections LG, NG,
  • a second voltage sensor unit SUB for determining the level of voltage across the electronic interruption unit EU
  • control unit SE which is connected to the differential current sensor unit ZCT, (optionally) to the current sensor unit SI, (optionally) to the first voltage sensor unit SUA, (optionally) to the second voltage sensor unit SUB, to the mechanical isolating contact unit MK and the electronic interruption unit EU.
  • the protective switching device SG in particular the control unit SE, is designed in such a way that when differential current limit values or differential current time limit values DSG1 are exceeded, a current flow in the low-voltage circuit is avoided by a high-resistance state of the switching elements of the electronic interruption unit when the isolating contacts are closed and the amount of the isolating contacts is subsequently undershot current value of the differential current below a differential current threshold value is initiated.
  • differential current limit values or differential current time limit values DSG1 are exceeded, avoidance of a current flow in the low-voltage circuit can be initiated by a high-resistance state of the switching elements of the electronic interruption unit when the isolating contacts are closed in the next zero crossing of the differential current.
  • the electronic interruption unit does not immediately become high-resistance, but rather it waits until the differential current has sufficiently approached the next zero crossing and only then , if the amount of the instantaneous value of the differential current falls below a differential current threshold value, the electronic interruption unit becomes high-resistance. This means that an electronic switch-off can be achieved near or at zero current crossing. This reduces or minimizes the impact on people causing the differential current, which, for example, reduces the risk of ventricular fibrillation, since it is assumed that a rapid current interruption could cause the risk of ventricular fibrillation.
  • the differential current can be evaluated via a digital algorithm in the control unit, for example by means of a microcontroller contained in the control unit.
  • the algorithm detects that differential current limit values or differential current time limit values have been exceeded (a fault current is detected)
  • the system waits until the amount of the instantaneous value of the differential current falls below a differential current threshold value.
  • the electronic interruption unit then becomes high-resistance to prevent current flow in the low-voltage circuit. This can be done by a computer program product for a microcontroller or a control unit for a protective switching device can be implemented.
  • the differential current threshold value can be, for example, less than 20 mA, less than 10 mA or less than 5 mA.
  • the optionally provided current sensor unit S I which is connected to the control unit SE, for determining the level of a current in the conductors of the low-voltage circuit, can design the protective switching device SG in such a way that when first current limit values are exceeded (i.e. if the level of the current exceeds the (amount) of the first current limit value) or first current time limit values (i.e. the first current limit value is exceeded for a first period of time; i.e. if the level of the (amount of) current exceeds the first current limit value for a first period of time) avoidance of a Current flow in the low-voltage circuit is initiated by a high-resistance state of the switching elements of the electronic interruption unit when the isolating contacts are closed.
  • the current flow can be avoided within a first period of time, which is in particular less than 1 ms, more specifically less than 100 ps or 10 ps.
  • the mechanical isolating contact unit MK is arranged on the load side
  • the electronic interruption unit EU is arranged on the network side according to the invention.
  • the GRID network side with the energy source is normally under electrical voltage.
  • An electrical consumer is usually connected to the load side LOAD.
  • the protective switching device can be designed in such a way that the level of the voltage across the electronic interruption unit can be determined.
  • D. H the level of a voltage between the network-side connection point EUG and the load-side connection point EUL of the electronic interruption unit EU can be determined or is determined.
  • a second voltage sensor unit SUB is provided which is connected to the control unit SE and which determines the level of the voltage between the network-side connection point EUG and the load-side connection point EUL of the electronic interruption unit EU.
  • the voltage across the series connection of the electronic interruption unit EU and current sensor S I can alternatively also be determined, as shown in Figure 1.
  • the current sensor unit S I has a very low internal resistance, so that the determination of the level of the voltage is not or negligibly affected.
  • the protective switching device can be designed in such a way that a first voltage sensor unit SUA is provided, which determines the level of the voltage of the low-voltage circuit, in particular between the network-side neutral conductor connection NG and the network-side phase conductor connection LG, as shown in Figure 1.
  • a first voltage sensor unit SUA is provided, which determines the level of the voltage of the low-voltage circuit, in particular between the network-side neutral conductor connection NG and the network-side phase conductor connection LG, as shown in Figure 1.
  • the electronic interruption unit EU is designed to be single-pole, in the example in phase conductor.
  • the network-side connection point APNG for the neutral conductor of the mechanical isolating contact unit MK is connected to the network-side neutral conductor connection NG of the GEH housing.
  • the protective switching device SG is advantageously designed in such a way that the contacts of the mechanical isolating contact unit MK can be opened by the control unit SE, but cannot be closed, which is indicated by an arrow from the control unit SE to the mechanical isolating contact unit MK.
  • the mechanical isolating contact unit MK can be operated by a mechanical handle HH on the protective switching device SG in order to switch the contacts KKL, KKN to manual (manual) opening or closing.
  • the mechanical handle HH indicates the switching state (open or closed) of the contacts of the mechanical isolating contact unit MK, in particular through a (purely) mechanical connection, on the protective switching device.
  • the contact position (or the position of the handle, closed or opened) can be transmitted to the control unit SE.
  • the contact position (or the position of the handle) can e.g. B. be determined by means of a sensor, such as a position sensor.
  • the contact position or The switching status can be transmitted to the control unit SE.
  • the position sensor can be part of the mechanical isolating contact unit MK.
  • the position sensor can be a component in the electronic first part (EPART, Figure 2).
  • a Hall sensor can be provided in the electronic first part (EPART), which detects and transmits the position of the contacts
  • the mechanical isolating contact unit is in particular a standard-compliant isolating contact unit for protective switching devices in installation technology in accordance with the standard, whereby it meets the regulations for classic circuit breakers (MCB) or Residual current circuit breaker (RCD) corresponds to .
  • the mechanical isolating contact unit MK is advantageously designed in such a way that (manual) closing of the contacts by the mechanical handle is only possible after an enable, in particular a release signal. This is also indicated by the arrow from the control unit SE to the mechanical isolating contacts unit MK.
  • the protective switching device SG has a power supply or power supply NT, for example a switching power supply.
  • the energy supply/power supply unit NT is provided for the control unit SE, which is indicated by a connection between the energy supply/power supply unit NT and the control unit SE in FIG.
  • the power supply/power pack NT is (on the other hand) connected to the network-side neutral conductor connection NG and the network-side phase conductor connection LG.
  • a fuse SS in particular a fuse, or a switch Sch ( Figure 2) can advantageously be provided in the connection to the network-side neutral conductor connection NG (or/and phase conductor connection LG).
  • the power supply unit NT is normally constantly supplied with energy, especially from the network-side connections. If necessary, it is protected by the SS fuse or can be switched off using the SCH switch.
  • the switch Sch can be designed in such a way that the switch can only be opened when the contacts are in the open state. This increases the safety of the device because the electronics (especially the control unit) cannot be switched off when the contacts are closed.
  • the fuse SS not only has the purpose of securing the energy supply by means of the power supply unit NT, but is also intended, in particular in the case of a two-part structure (see Figure 2), to protect the "electronic" first part EPART or its entire units (such as especially the control unit, electronic interruption unit, if necessary voltage sensor unit (s), differential current sensor unit, if necessary current sensor unit, if necessary measurement impedance, etc.).
  • a measuring impedance ZM can be connected to the network-side neutral conductor connection NG via the fuse SS.
  • a three-pole electronic unit or an electronic first part EPART (FIG. 2) can advantageously be realized, for example as a module that has three connections with respect to the low-voltage circuit, a neutral conductor connection and two phase conductor connections.
  • the electronic first part EPART can have further connections, in particular for control or measurement information, such as a release signal Enable / enable, opening signal OEF, position information (from the position unit POS) and / or differential current signal (level of the differential current) from the differential current sensor unit ZCT .
  • the electronic unit or electronic first part EPART has, for example, the electronic interruption unit EU, the control unit SE, the power supply NT (in particular including fuse SS), the current sensor unit ST, optionally the first voltage sensor unit SUA and/or optionally the second voltage sensor unit SUB on.
  • the low voltage circuit may be a three-phase alternating circuit, with a neutral conductor and three phase conductors.
  • the protective switching device can be designed as a three-phase variant and, for example, have additional line-side and load-side phase conductor connections.
  • Electronic interruption units according to the invention and contacts of the mechanical isolating contact unit are provided in an analogous manner between the further network-side and load-side phase conductor connections.
  • the respective conductors (three phase conductors LI, L2, L3, neutral conductor N) are routed through the differential current unit ZCT.
  • high-resistance is meant a condition in which only a negligible current flows.
  • high-resistance means resistance values of greater than 1 kiloohm, better greater than 10 kiloohm, 100 kiloohm, 1 megaohm, 10 megaohm, 100 megaohm, 1 gigaohm or greater.
  • Low-resistance refers to a condition in which the current value specified on the protective switching device could flow.
  • low-resistance means resistance values that are smaller than 10 ohms, preferably smaller than 1 ohm, 100 milliohms, 10 milliohms, 1 milliohms or smaller.
  • Figure 2 shows a representation according to Figure 1, with the difference that the protective switching device is constructed in two parts. It contains an electronic first part EPART, for example on a printed circuit board.
  • EPART electronic first part
  • the first part EPART can be the control unit SE, the first voltage sensor unit SUA, the second voltage sensor unit SUB, the current sensor unit SI, the electronic interruption unit EU, the power supply NT. Furthermore, the first part can have the fuse SS, a switch SCH, the measuring impedance ZM, a temperature sensor TEM (in particular for the electronic interruption unit EU), a communication unit COM, a display unit AE, and, as a variant, a position sensor unit POS.
  • the electronic first part EPART has only three connections to the low-voltage circuit:
  • connection EN for a connection to the network-side neutral conductor connection NG.
  • the two connections: to the mains-side phase conductor connection LG and for the or. to the grid-side phase conductor connection point APLG have a high current-carrying capacity, e.g. B. several amps, greater than 10A / 16 A - depending on the nominal current or Rated current of the low-voltage circuit, in particular to carry the load current even in the event of a short circuit or overload.
  • a high current-carrying capacity e.g. B. several amps, greater than 10A / 16 A - depending on the nominal current or Rated current of the low-voltage circuit, in particular to carry the load current even in the event of a short circuit or overload.
  • the third connection EN for the connection to the network-side neutral conductor connection NG has a (in comparison) low current-carrying capacity, e.g. B. less than 1A, a few mA - depending on the energy requirements of the units supplied, especially in the electronic first part EPART.
  • the third connection EN is designed with a low current carrying capacity to supply power to the power supply and to measure voltage between the phase conductor and neutral conductor of the low-voltage circuit.
  • this third connection EN is protected by a fuse SS. This can be achieved using a fusible fuse or a cost-effective conductor track fuse (thin conductor track of appropriate length and thickness on the circuit board).
  • This short-circuit current is fed from the network via the network-side connections.
  • An upstream circuit breaker often has a much higher tripping current and feeds low-voltage circuits provided in parallel. If there is a fault in the protective switching device (the protective switching device of the protected low-voltage circuit) and the upstream circuit breaker is triggered, error-free parallel circuits would also be switched off, which is therefore avoided.
  • the communication unit COM can in particular be a wireless communication unit.
  • the communication unit COM can have a (manual) input unit on the protective switching device for (manual) acknowledgment of states on the protective switching device SG.
  • the acknowledgment can also take place (wired and/or wirelessly) via the communication unit COM.
  • the communication unit COM can have a display function.
  • a separate display unit can also be provided.
  • the protective switching device contains a second part, in particular a mechanical one, MPART.
  • the second part MPART can have the mechanical isolating contact unit MK, the handle HH, a release unit EG. Furthermore, the second part can have a position unit POS, for reporting the position of the contacts of the mechanical isolating contacts unit MK to the control unit, as well as the (neutral conductor) connection (s).
  • the second part MPART has the differential current sensor unit ZCT, like a summation current transformer, as is known, for example, from classic residual current circuit breakers.
  • the release unit/release function FG enables the actuation of the contacts of the mechanical isolating contact unit to be released by the handle HH when a release signal enable is present.
  • D. H Closing the contacts KKL, KKN by the handle is only possible when the release signal enable (from the control unit SE) is present. Otherwise closing is not possible (continuous slide of the handle HH).
  • the contacts remain in the open position/switching state.
  • the release unit FG can cause the contacts to open (second function of the release unit FG) if an opening signal OEF (from the control unit SE) is present.
  • the release unit/release function FG then acts as a trigger unit for opening the contacts of the mechanical isolating contact unit MK.
  • the protective switching device SG in particular the control unit SE, is further designed in such a way that if current limit values or current time limit values are exceeded (i.e. if a current limit value is exceeded for a certain period of time), avoidance of a current flow in the low-voltage circuit is initiated, in particular by one To avoid short-circuit current. This is achieved in particular by the electronic interruption unit EU changing from the low-resistance state to the high-resistance state.
  • the avoidance of a current flow in the low-voltage circuit is initiated, for example, by a first interruption signal that is sent from the control unit SE to the electronic interruption unit EU.
  • the mechanical isolating contact unit MK can alternatively or additionally be controlled by the control unit SE in order to initiate avoidance of a current flow in the low-voltage circuit when current limit values or current time limit values are exceeded. In particular, this may be: leads to galvanic isolation.
  • Galvanic interruption of the low-voltage circuit occurs, for example, by a second interruption signal that is sent from the control unit SE to the mechanical isolating contact system MK.
  • the electronic interruption unit EU can have semiconductor components such as bipolar transistors, field effect transistors (FET), insulated gate bipolar transistors (IGBT), metal oxide layer field effect transistors (MOSFET) or other (self-guided) power semiconductors.
  • semiconductor components such as bipolar transistors, field effect transistors (FET), insulated gate bipolar transistors (IGBT), metal oxide layer field effect transistors (MOSFET) or other (self-guided) power semiconductors.
  • IGBTs and MOSFETs are particularly suitable for the protective switching device according to the invention due to low flow resistances, high junction resistances and good switching behavior.
  • the mechanical isolating contact unit MK refers in particular to a (standard) isolating function, implemented by the isolating contact unit MK.
  • a disconnecting function the points are: -Minimum air distance according to standard (voltage-dependent) (minimum distance of the contacts), -Contact position display of the contacts of the mechanical isolating contact system, -Opening of the mechanical isolating contact system is always possible (no blocking of the isolating contact system - especially by the handle, free release) , meant .
  • the protective switching device can be designed as a DIN rail-mountable protective switching device SG with a width of, for example, 1 TE, 1.5 TE or 2 TE with two-pole connections (L, N).
  • the width of built-in devices such as protective switching devices, circuit breakers, residual current circuit breakers, etc. is specified in division units, TE for short.
  • the width of a division unit is ⁇ 18 mm.
  • a single-pole circuit breaker according to the prior art has a width of 1 HP.
  • the internals of electrical installation distributors are tailored to the division units in accordance with DIN 43871 “Small installation distributors for built-in devices up to 63 A”, e.g. the width of mounting rails/hat rails.
  • the protective switching device SG in particular the control unit SE, can be designed in such a way that when effective differential current time limit values are exceeded, avoidance of a current flow in the low-voltage circuit is initiated, for example by a high-resistance state of the switching elements of the electronic interruption unit when the isolating contacts are closed.
  • the effective differential current time limit values can be limit values according to relevant standards, such as DIN EN 61008-1.
  • a current differential current limit value can be higher in magnitude than the effective differential current time limit value.
  • the current differential current limit is a value from the range of 2 to 100 times the effective differential current time limit value.
  • the current differential current limit can be a value of 200 mA, for example.
  • the protective switching device can be designed in such a way that, for example, when a differential current value of 200 mA is reached, the current flow is avoided immediately. This means that if the differential current is high, it cannot be switched off with a delay, but rather immediately (in order to increase personal safety in particular (accepting the possible fibrillation of the ventricle, but possibly without fatal consequences, since the energy input is reduced)).
  • the computer program product can advantageously be stored on a computer-readable storage medium; such as a USB stick, CD-ROM, etc. ; be saved, e.g. B. to enable an upgrade to an extended version.
  • a computer-readable storage medium such as a USB stick, CD-ROM, etc.
  • the computer program product can also advantageously be transmitted using a data carrier signal.
  • the SE control unit can:
  • a digital circuit e.g. B. with a (further) microprocessor; the (further) microprocessor can also contain an analogue part;

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un disjoncteur (SG) pour protéger un circuit basse tension électrique pour une tension alternative, le niveau d'un courant différentiel de conducteurs du circuit basse tension étant déterminé, et si des seuils de courant différentiel ou des seuils de temps de courant différentiel (DSG1) ont été dépassés, un processus pour empêcher le flux de courant dans le circuit basse tension étant initié au moyen d'un état ohmique élevé d'éléments de commutation d'une unité d'interruption électronique dans l'état fermé de contacts de séparation avec une valeur actuelle suivante du courant différentiel chutant au-dessous d'un seuil de courant différentiel.
PCT/EP2023/071972 2022-08-31 2023-08-08 Disjoncteur et procédé WO2024046723A1 (fr)

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DE102022209035.7A DE102022209035A1 (de) 2022-08-31 2022-08-31 Schutzschaltgerät und Verfahren
DE102022209035.7 2022-08-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4432643A1 (de) 1994-09-14 1996-03-21 Rainer Dipl Phys Berthold Kontaktanordnung für einen Fehlerstromschutzschalter
US20070081281A1 (en) * 2005-10-12 2007-04-12 Chevron U.S.A. Inc. Ground-fault circuit-interrupter system for three-phase electrical power systems
EP3091550A1 (fr) * 2015-05-05 2016-11-09 Siemens Aktiengesellschaft Dispositif de commutation hybride
DE102017122220A1 (de) * 2017-09-26 2019-03-28 Eaton Industries (Austria) Gmbh Schutzschalter und Verfahren zum Betreiben eines Schutzschalters
DE102019213604A1 (de) * 2019-09-06 2021-03-11 Siemens Aktiengesellschaft Schutzschaltgerät, Schutzschaltsystem und Verfahren

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018213354A1 (de) 2018-08-08 2020-02-13 Siemens Aktiengesellschaft Schaltgerät und Verfahren
DE102020216396B3 (de) 2020-12-21 2022-05-12 Siemens Aktiengesellschaft Schutzschaltgerät und Verfahren

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4432643A1 (de) 1994-09-14 1996-03-21 Rainer Dipl Phys Berthold Kontaktanordnung für einen Fehlerstromschutzschalter
US20070081281A1 (en) * 2005-10-12 2007-04-12 Chevron U.S.A. Inc. Ground-fault circuit-interrupter system for three-phase electrical power systems
EP3091550A1 (fr) * 2015-05-05 2016-11-09 Siemens Aktiengesellschaft Dispositif de commutation hybride
DE102017122220A1 (de) * 2017-09-26 2019-03-28 Eaton Industries (Austria) Gmbh Schutzschalter und Verfahren zum Betreiben eines Schutzschalters
DE102019213604A1 (de) * 2019-09-06 2021-03-11 Siemens Aktiengesellschaft Schutzschaltgerät, Schutzschaltsystem und Verfahren

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