EP0304456A1 - Dispositif protecteur contre des surintensites de courant pour des installations d'alimentation en courant d'immeubles residentiels, industriels et similaires - Google Patents

Dispositif protecteur contre des surintensites de courant pour des installations d'alimentation en courant d'immeubles residentiels, industriels et similaires

Info

Publication number
EP0304456A1
EP0304456A1 EP19880902143 EP88902143A EP0304456A1 EP 0304456 A1 EP0304456 A1 EP 0304456A1 EP 19880902143 EP19880902143 EP 19880902143 EP 88902143 A EP88902143 A EP 88902143A EP 0304456 A1 EP0304456 A1 EP 0304456A1
Authority
EP
European Patent Office
Prior art keywords
current
contactor
signal
line
overcurrent
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.)
Withdrawn
Application number
EP19880902143
Other languages
German (de)
English (en)
Inventor
Gerhard Rudolf Unger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0304456A1 publication Critical patent/EP0304456A1/fr
Withdrawn legal-status Critical Current

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
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection

Definitions

  • the invention relates to an over-current protection device for power supply systems of residential and commercial buildings and similar buildings, in particular for power supply systems in residential buildings with an over-current protection device for protecting the power lines in the area of house introduction, which are connected to the distribution network by means of house connection line power lines branching off from its phason conductors.
  • a house entry includes house entry line or house entry cable, both referred to below as lines that start at the entrance tunnel into the building, and the associated house terminal, which forms the transfer point to the consumer system.
  • Each house entry contains in the house junction box the necessary overcurrent protection elements, mostly tire-shaped fuse pieces, the bare cross-section for current conductors of the house entry line is dimensioned according to the nominal current of the overcurrent protection elements, and the house entry solution is laid so that in the event of an arcing short the line leakage without risk of building expansion can. Does this also go with the line protection that is actually intended for the consumer bankruptcy on the house entry line and, if applicable, on the house connection line, it can only be effective if there is a short circuit or if an overcurrent is caused in the consumer system.
  • the electrical distribution network for the power supply has been expanded to an appropriate extent, in some cases newly built.
  • the distribution network not only has the distribution network been expanded with an increased number of main mains lines, which lead to different groups of consumer systems with partly different nominal voltages, but also the number of these main mains lines to the individual ones
  • Building connection lines branching off from buildings is already considerably large, especially in residential areas.
  • the house connection lines which are connected in parallel on a main network line, are located close to each other, similar to those in the streets of cities.
  • an overcurrent protection device of the type specified for power supply systems in particular residential buildings, is created with which a line contactor for house connection lines and also for main network lines is achieved, which is in the area between the distribution network and the Overcurrent protection devices of the house guides caused overcurrent or short circuit to come into effect quickly.
  • the invention consists essentially in the fact that an overcurrent protection element is additionally provided in each current conductor of a house connection line, and that shortly after the branching of the house entry line from the distribution network, which protection element contains a line circuit breaker which actuates this circuit breaker control unit, which can have a signal amplifier that can be used with Power is supplied from the distribution network, an overcurrent detector, from which the control unit receives a signal that controls the switch-off of the current (consumer current) by means of the circuit breaker if an overcurrent occurs in the relevant current conductor of the house connection line, and a monitoring device, from which the control unit receives a signal the signal controlling the reclosure of the current is supplied if the cause of the overcurrent has been eliminated.
  • overcurrent protection device with switchable protective devices that are controlled by overcurrent and overcurrents, short circuits in the house connection line or quickly switch off in the house entry line.
  • a short-circuited ventilation system is thus protected in good time against the risk of high current loads and at the same time the power supply to the consumer systems connected to the distribution network via short-circuit-free lines is maintained without interruption.
  • the main power supply line is protected against overload in good time, so that an emergency shutdown of the affected network sector is avoided.
  • the superutro protection devices of all current conductors of a house connection line are housed in a common protective housing.
  • the same is designed to be shock and impact resistant, hermetically sealed and has an input and an output terminal for each current conductor and for the neutral conductor of the house connection line.
  • Embodiments of the invention are characterized by different versions of the switchable Uberstromocnutzorganes. characterized in the invention, which are explained in the description below using examples and are outlined as follows.
  • An electromechanical contactor serves as a circuit breaker for the overcurrent protection device.
  • the associated control unit contains two relay current circuits connected to the distribution network as a current source for electromagnetic actuation, one for the separation and one for the closing of the contactor contacts, each with a semiconductor switching element and an excitation coil in series connection.
  • the semiconductor switching element of the relay circuit for the separation of the Schsltach Jardin Scotlande is by a signal from the overcurrent detector and / or a Short circuit signal generated in the house connection line driven to switch on the excitation current.
  • the semiconductor switching element of the relay circuit for closing the contactor contacts for reclosing the consumer current is activated by a signal from the monitoring element in order to switch on the excitation current, namely by the signal recurring after the cause of the overcurrent or the short circuit has been eliminated
  • the relay circuits are connected to the distribution network via a mains rectifier.
  • the relay circuit provided for this purpose is connected in a known manner to a current source with a DC voltage which is greater than the mains rectifier voltage. The same measure can be carried out for the relay circuit for the closing of the contactor contacts, in order to be able to close the same also with shorter actuation times than without this measure when the current is switched on. 2nd
  • a semiconductor contactor with two line thyristors connected in parallel in opposite directions serves as a line protection switch.
  • the associated control unit contains a control pulse generator with an output common to both hetzthyristors, to which a semiconductor switch is connected in parallel.
  • the control pulse generator is connected to the distribution network as a current source for the formation of control pulses, by means of which the network thyristors of the circuit breaker are controlled in a current-conducting manner for passage of the alternating current (consumer current).
  • one of the two network thyristors causes the semiconductor switch mentioned to be turned off by a signal from the overcurrent detector or by a signal from a short-circuit detector, and the control output is thus kept short-circuited until a signal from the monitoring element is present, in order to switch off the consumer current by self-extinguishing is released to restart the consumption current, whereby the signal of the overcurrent detector is terminated.
  • the circuit breaker consists in the fact that the series connection of an electromechanical contactor and a choke is connected in parallel with a semiconductor contactor with two sensibly parallel line thyristors.
  • the semiconductor contactor is used here as auxiliary switching means for, in particular, disconnecting the contactor contacts from one another when the current is switched off and is free from arcing.
  • a pulse-shaped voltage is formed by the current rise when an overflow arises, which is applied to the semiconductor contactor and enables the ignition of a line thyristor, so that it is uno / or by a signal from a short-circuit detector, preferably of the monitoring body used as a soloner is turned on in a current-conducting manner.
  • the same signal fed to the control unit of the semiconductor contactor is simultaneously fed to the control unit of the electro-mechanical contactor in order to control the semiconductor switching element of the rice circuit for the separation of the switching contactor contacts and to switch on the excitation current therefor.
  • the control units of the Melbleirey contactors are simultaneously fed to the control unit of the electro-mechanical contactor in order to control the semiconductor switching element of the rice circuit for the separation of the switching contactor contacts and to switch on the excitation current therefor.
  • This sigual must, in order to continuously control the line thyristors, be supplied for longer than the switch-off time of the electromechanical contactor, so that the line thyristors remain conductive for the current they are switched on and the arm contactor contacts are kept current physically until they are separated.
  • the signal of the monitoring device that is emitted after the cause of an overcurrent or short circuit has been eliminated is fed to the control unit of the electromechanical contactor in order to control the semiconductor switching element of the relay current circuit for closing the switch protection contacts and to switch on the excitation current for this.
  • the same signal can be fed to the control unit of the semiconductor contactor at the same time if the switch contacts of the electromechanical contactor are also to be closed without arcing. For this, the line thyristors of the semiconductor contactor must pass through the
  • Signal is kept conductive for longer than the switch-on time of the electromechanical contactor.
  • FIG. 1 shows a schematic representation of an overcurrent protection device according to the invention for a high-voltage system constructed in accordance with VDE 0100 Part 732 / 03-83.
  • FIG. 2 shows the block diagram of an overcurrent protection device according to the invention in accordance with embodiment 1 and
  • FIG. 3 shows the block diagram of an overcurrent protection device according to the invention in accordance with the embodiment 2 and
  • FIGS. 4 shows the block diagram of an overcurrent protection device according to the invention corresponding to embodiment 3 outlined above.
  • FIGS. 4 shows the block diagram of an overcurrent protection device according to the invention corresponding to embodiment 3 outlined above.
  • FIG. 1 only the part provided with reference symbol E, namely the house entry, a high-voltage system for the power supply of a residential building is shown.It comprises the house entry line 1 starting at the entrance to the building H and the house junction box HK, which contains overcurrent protection elements Ü, which strip-shaped fuses are Si.
  • the part of the installation in FIG. 1 to the right of the branch V of the house entry line to the individual consumer groups is called the consumer installation, it is indicated by the reference symbol A.
  • the house connection line 1 ' through which the house entry line 1 is connected to a main network of the distribution network N, additional cross-protection devices U' are inserted, which, in contrast to the visual protection devices U, can be activated.
  • An overcurrent protection device can be switched by using a circuit breaker L as a component, which is opened by means of a control unit St, which may contain signal amplifiers, and thereby switches off the Stroit in the current conductor in which the overcurrent protection device is inserted as soon as this current conductor leads to overcurrent 1 and the line circuit breaker is closed and thereby switches the current in the conductor back on as soon as the cause of the overcurrent has been eliminated.
  • Upper current is detected by a current detector D with a current sensor W st and sent to one
  • Input I of the control unit St signals.
  • a signal is formed by a monitoring device ⁇ as a criterion for eliminating the cause of the overcurrent, which is fed to an input II of the control unit.
  • the circuit breaker is actuated in each case by means of an operative connection with the control output III from St in the corresponding sense.
  • the constituents L, St, O and D mentioned with w st each form a switchable overcurrent protection device.
  • the three switchable overcurrent protection devices in the current sensors 1 R ', 1 S ', 1 T 'of the three-phase house connection line 1' are enclosed in a protective protective housing 0, the main features of which are given above, as can be seen from FIGS. 2 to 4 is where an overcurrent protection device Ü of three identical protection devices is shown each time.
  • the overcurrent protection device S R ' shown in FIG. 2 contains an electromechanical contactor Sch as a line circuit breaker with a switch contact pair K, K shown in the closing division, consisting of a fixed and a pivotable switch contact.
  • the associated controller St consists of two relay circuits for electromagnetic actuation, each with an excitation coil e 1 or e 2 and one contactless relay switching element, namely thyristors T1 and T2, in series connection, which are connected in parallel at the output of a mains rectifier G1 feeding them. This is connected via a network transformer Tr to the network phase (here R), from which the current conductor to be protected (here 1 R ') branches off.
  • the excitation poles are ignition windings, each with a rod-shaped actuating magnet m1 or m2 that can be moved in and along the coil axis, which is mechanically coupled with a plunger that strikes the pivotable gold contact K in the manner of an impact anchor.
  • the plunger is illustrated by an arrow head directed against K and the mechanical coupling by an action line.
  • the excitation current in the coil e1 is switched on by an ignition current of the overcurrent detector described in more detail below, which is supplied to the control electrode of the thyristor T1, which forms the input I of St, and thereby triggers the actuation process for separating the switching contacts K by means of the associated plunger.
  • An ignition signal of the monitoring device O described in more detail above is supplied to the control electrode of the thyristor T2, which forms the input II of St, in the coil e2 the excitation current is switched on, which triggers the actuation process for closing the switching contact contacts K by means of the assigned plunger.
  • the lines of action mentioned each individually form an actuation output, designated III, of the St. unit St. According to FIG. 2, the two relay circuits with the thyrist.
  • T1, T2 a push-pull circuit which is activated each time by a signal from the overcurrent detector when the excitation current is switched on in the coil e1, and then by a signal from the monitoring device 0 the excitation current in the coil e2 is switched on, with the disappearance of which the push-pull circuit is deactivated If it contains a quenching capacitor C L in FIG.
  • the excitation current switched on by means of the thyristor T1 flows until the switch on .Excitation current by means of the thyristor T2, whereby T1 is forcibly extinguished, and this excitation current flows until the excitation current is switched on by means of the thyristor T1, which in turn forcibly extinguishes T2, and so on.
  • the thyristors T1 and T2 are replaced by switching transistors as semiconductor switching elements and the signals from D and O are extended for actuation until the next one (from 0 and D) is emitted, even if the DC voltage is not gap-free Relay circuits feeding the mains rectifier.
  • the measures mentioned, with which an accelerated switching of the contactor contacts is achieved, are supplemented in the overcurrent protection device according to FIG. 2 by using the charging circuit shown on the left next to the figure with a controlled charging switch S L for a capacitor C, the contactor contacts each with a shorter actuation time than be separated from each other without a charging circuit, so that a correspondingly lower response delay of the actuating means of the associated Helais circuit is achieved.
  • the charging circuit is connected by a rectifier to an additional secondary winding wz of the Hetztransfor ⁇ ators Tr, which is designed for a voltage which is several times higher than the voltage supplied to the Hetz rectifier Gl. An increased power-to-weight ratio of the transformer is not necessary for this.
  • the capacitor C is charged to a correspondingly high DC voltage via a resistor and the charging switch S L , which is dimensioned for a desired short actuation time, for example 10 to 20 milliseconds. Both electric circuits are connected to the high DC voltage at output a of the charging circuit at the point labeled a.
  • the above-mentioned overcurrent detector D and, likewise, the monitoring device O also form the other main parts of the overcurrent protection element O 'shown in FIG.
  • the short line or cable section of the current conductor 1 R 'between the contactor contact pair K, K and the output terminal Kl A of the same serves as a current sensor w st for detecting overflows occurring in the current conductor 1 R '.
  • Sensor lines f connected, which are connected via a discriminator or filter circuit F to the input of a rectifier bridge Gr according to Graetz.
  • a threshold level st is connected, which is arranged upstream of a flip-flop k with an amplifier.
  • the components F, Gr, st, k together with W st form the overcurrent detector D. Its output is the output of k, the is connected by signal lines once to the control input I of St, that is, to the control element e of the thyristor T1, and once to the control input b of the charging circuit mentioned.
  • the filter circuit F is specially designed for passage of the inductive component of the voltage tapped at the line section of 1 R 'and the threshold value of the stage st is dimensioned so high that it is not greater than the voltage value of the inductive component, which corresponds to the increase di / dt of Current in the house connection line 1 R 'Dei corresponds to a short circuit. Lamit is only given a signal of the threshold level in the event of a short circuit, thereby generating the ignition signal at the output of the trigger circuit k for triggering the actuation process for separating the switching contacts from Sch and for switching on the charging current in the charging circuit for the capacitor C.
  • the ignition signal is generated when a short circuit is cleared, so that the short-circuit current rises during the actuation process triggered thereby and is switched off by the separation of the switch contacts before it becomes so great that the voltage of the distribution network is inadmissible when the short-circuited house connection line is branched off sinks far.
  • An overcurrent detector D is additionally set up for the detection of overcurrents which do not occur as a result of a short circuit, for example with an additional threshold value stage, which is connected on the input side via an additional rectifier bridge to sensing lines which are connected to the filter circuit F by the Branch lines f, this is on the output side
  • Threshold stage connected to the input of flip-flop k. Their threshold value is dimensioned such that an ignition signal is only generated when an over-litter reaches a predetermined value.
  • the monitoring device O of the overcurrent protection device according to FIG. 2 consists essentially of a voltage divider, which is formed by the two primary windings w1, 2 of two savings converters W1, W2 that have failed. This voltage divider connects inside the protective housing G of U R 'the input terminal Kl E dun Süroßleiters 1 R ' with the output terminal Kl A of the neutral conductor MP, it is thus connected to the existing phase voltage between the phase conductor K and Mi (star voltage) .
  • this alternating voltage is converted into a rectangular control signal for the thyristor T2 of the control unit St, by which the excitation current in the excitation coil e2 is switched on and the actuation process for closing the contactor contacts for reactivating the current is triggered.
  • the length of the control signal can expediently be limited to a period of time, starting when the alternating voltage returns to w s , that is not shorter than the actuation time for the closing of the Switching contact K, K is so that the excitation current is switched off after the same.
  • Control signals with a limited period of time, formed by a monitoring device, as described above, as well as control signals with a limited period of time, formed by an overcurrent detector D, serve the purpose mentioned if transistors as semiconductor switching elements T1 and T2 are actuated instead of thyristors or if thyristors or thyristors with individual quenching that can be switched off are switched off an adapted control unit St can be used.
  • the signal converter of the monitoring device can finally contain a flip-flop for signal generation and an upstream threshold value stage instead of a converter stage U, so that by submitting a sufficiently high threshold value, the delivery of a control signal and thus closure of the contactor contacts K, E is correspondingly prevented if a short circuit or Cause of an overcurrent has not been completely eliminated.
  • an overcurrent protection element R ' shown in FIG. 3 a semiconductor contactor with two line thyristors Th1, Th2 connected in parallel in opposite directions is used as line circuit breaker L instead of an electromechanical contactor, as described above on page 5 under point 2 and further explained. According to FIG.
  • the associated control unit St contains a control pulse generator, which is connected via the voltage converter W2 of the monitoring element 0 to the distribution network N, which serves as a current source for forming control pulses.
  • the voltage converter for transferring the required power to the control pulse generator is designed like a mains transformer with a corresponding transmission ratio
  • the monitoring device O is used in its intended function and at the same time as a short-circuit detector.
  • An overcurrent detector D is therefore the one described here
  • An overcurrent protection device is only provided if the consumer current is to be switched off when a specified overcurrent value is reached.
  • FIG. 3 shows this overcurrent detector with its components f, Gr, st, k for the sake of completeness, but without connection to an ammeter w st by means of the sensing lines f.
  • the line thyristors Th1, Th2 of the line circuit breaker L are then no longer supplied with control pulses, so that their current conduction is ended by self-extinguishing and the consumer current is switched off.
  • the switching transistor T k can also be controlled in a current-conducting manner by a signal from a short-circuit detector.
  • the signal from the monitoring device O for switching the consumer current on is branched off from D via a signal line r to the reset input of the multivibrator k, whereby T k is blocked, so that the control pulses are then fed back to the line thyristors of the circuit breaker switch L.
  • Controllable control pulses are generated by rectification and conversion of the down-converted phase alternating voltage u R , which is transmitted to the secondary winding w of the voltage converter W2 and is fully connected to the consumer, generated by means of the rectifier bridge Gr and the converter stage U.
  • the monitoring device is also designed as a short-circuit detector with the voltage converter V2 implemented as the mains transformer of the control pulse generator.
  • V2 implemented as the mains transformer of the control pulse generator.
  • a short circuit occurs in the house connection Line 1 'on, the phase change voltage u R at the voltage converter W2 disappears, so that no more control pulses are generated.
  • the line thyristors of the circuit breaker are automatically extinguished when the consumer current crosses zero and the consumer current is switched off. Even while the consumer current changes into the temporal current curve in the event of a short circuit, the amplitude of the phase alternating voltage across the voltage converter W2 becomes so small that no controllable control pulses are formed.
  • the full phase alternating voltage u R is applied to the voltage converter W1 of the monitoring device 0, as long as the short circuit persists.
  • the short circuit has been eliminated, it is temporarily on the series circuit of the voltage transformer primary windings w1 and w2 which forms a voltage divider as long as the line thyristors of the circuit breaker L are not current-conducting.
  • the number of turns ratio w2 / e1 of the voltage transformer primary windings is chosen so that the voltage component of u R on the primary winding w2, taking into account the transmission ratio w2 / w s , of the converter W2 is sufficiently large for the generation of ignitable control pulses.
  • the full phase AC voltage u R is again on the primary winding of the converter V2.
  • the line circuit breaker L consists in the combination of a semiconductor contactor
  • the consumer current is kept permanently closed via the electro which is kept closed for normal power supply Contactor supplied.
  • the semiconductor contactor serves as auxiliary switching means so that in the event of a short circuit or an overcurrent in the house connection line, the contactor contacts K, K are separated from one another with the lowest possible current load or even without arcing.
  • the semiconductor contactor is made conductive by the signal from the overcurrent detector D and / or the monitoring element O, the line thyristor being stressed in the forward direction by the voltage pulse existing at the inductor Dr when the Eurcurrent current i k increases, is ignited and turned on to conduct electricity.
  • the choke is turned on is still closed contactor vision for the short-circuit current einj ⁇ iederohmiger shunt, so that on this side current branch and the (short-circuited) to the neutral conductor MP and the HausansSchluß ein 1 R 'of the largest portion of the rising Kurzsc & lußstromes flows during the current branch with Sch and Dr is burdened with a correspondingly small proportion, which also rises much more slowly.
  • the signal from the overcurrent detector and / or the monitoring member is simultaneously fed to the control unit St of the electromechanical contactor in order to switch on the excitation current of the relay circuit for the separation of the contactor contacts.
  • the control unit St of the electromechanical contactor Seh is designed like that according to FIG. 2, specifically with thyristors T1 and T2 as semiconductor switching elements of the 2 relay circuits in push-pull circuit.
  • the control unit can be assigned a charging circuit, as shown on the left in FIG. 2, for the purpose of additionally reducing the switch-off time of the contactor to 10 msec and shorter if necessary.
  • the control unit for the network thyristors Th1, Th2 of the semiconductor contactor is a signal amplifier with a signal input I, to which signals derived from converter stage U of the monitoring element 0 are supplied, and a control output III to the network thyristors, which are in the same manner as in the corresponding control unit according to Figure 3 can be controlled.
  • the control unit St according to FIG. 4 is supplied with current from the mains rectifier G1 via the connection of the 2 relay circuits.
  • An overcurrent protection device according to FIG. 4 can, if necessary, contain an overcurrent detector and a monitoring device, which are then assigned to both contactors Sch and Th2, Th2 together.
  • the overcurrent protection device shown in FIG. 4, on the other hand contains only the monitoring device 0 and assigned together, which is also used as a short-circuit detector. For this purpose, the control function of the converter stage U is designed accordingly
  • the control output is once directly with the control input II of St (control electrode of T2) and once via a flip-flop k u with the Control input I (control electrode of T1) connected.
  • the commutation current switched on by means of the semiconductor contactor is switched off by self-extinguishing of the current-carrying line thyristor in the next zero crossing; its re-activation in opposite polarity by means of the second line thyristor does not occur.
  • the primary winding of the voltage converter W2 (part of the inductive voltage divider W1, W2) becomes live and the AC voltage on the secondary winding returns.
  • stage U At the control output of stage U, as described above, this results in the control pulses which are controllable for the semiconductor switching element T2 of the control unit Sjz, and at the same time the permanent pulse which receives the semiconductor switching element T1 in a current-conducting manner disappears, while the contactor contacts are separated from one another if the rectifier Gl is one supplying DC voltage.
  • the excitation current for closing the switching contactor contacts is switched on by the control pulse, which is now fed to the control electrode of the semiconductor switching element Ts2.
  • a switching means q for example an electromagnetically remotely operated normally closed contact, which is normally held in the closed position by an excitation current by the contactor contacts, which separate from each other as a result of a short circuit, is brought into the open position, where the contact of q remains as long as the excitation current is interrupted.
  • the excitation circuit is led from q in the form of a cable loop through terminal Kl A out of the protective housing and laid together with the house connection line II to the house entrance E (see figure 1).
  • the remote-controlled switching means can also be designed as a semiconductor relay, it can also be used in the embodiment shown in FIG. 3.
  • An example of a power supply system is that for a local outskirts with 10 house connections, which is supplied with power by a 0.5 km long main line of the distribution network, a low-voltage cable VPK.
  • 10 parallel wired building connection lines branch off from the main line and lead to individual apartment blocks and groups of apartment houses.
  • Each house connection line is for a nominal current consumption of the connected consumers of 100 A with 220 V connection voltage. designed, and each contains 3 phase connection lines 1 R ', 1 S ', 1 T 'and the neutral conductor MP.
  • each phase connection line of the house connection line must have an overcurrent protection element U '.
  • phase currents i R , i s , i T in the lines 1 R ', 1 s ', 1 T ' in phase short-circuit currents i k) R , i k) s , i k) T which in Since the point of the short circuit, start to rise with the respective polarity of the phase currents.
  • the short-circuit current in one of these lines no longer forms in the event of a short-circuit of the three phase connection lines, because the short-circuit occurs at a point in time too short, for example 30 el, before the end of the relevant half-oscillation of the phase current, it can occur in at least fully form one of the other phase connection lines.
  • Its time profile i k (t) can be approximated with the simplifying restriction that during the rise time of the short-circuit current the generator voltage E ph of the phase ph of the distribution network has the effective value E ph constant. It is so large that the effective value of each phase connection voltage affects u ph for the consumer at the nominal load of the 3-phase network.
  • the inductance of the inductor Dr is dimensioned according to the value di k / dt (0) of the slew rate of i k determined from relation (2), so that the voltage pulse has the pulse height required to open the fired line thyristor.
  • the choke is designed so that the voltage pulse remains approximately 0.1 mrek long with the pulse height unchanged, so that delayed delays due to inhibition are possible with control times that are longer than the switch-on times of thyristors of 15 ⁇ sec, for example.
  • a / msec field permeability of its magnetic core with a Glejchstromflutung of 100 A has an inductance of, for example, 0.05 mH, is for practical reasons as a so-called single-core choke mib cut ribbon cores Drk made of a soft magnetic material in a circular or preferably rectangular shape, which according to Figure 4 above the phase connection line 1 ' R are stacked together.
  • Such a choke can be produced, for example, with a small number of cut ribbon cores made of textured silicon sheet, each core having the dimensions 25 cm iron path length, 4 cm core height and 6.8 cm 2 core cross section and each by means of
  • Tension locks are tightened.
  • Four or twelve cutting tape cores are required for this, depending on the size (0, M mm or 0.1 mm) of the air gaps between their separating surfaces.
  • a choke Dr with the same effect and suitability for the desired formation of the voltage pulse can also be produced, for example, with a number of cutting tape cores made of a cobalt-iron alloy with approximately 50% cobalt, which have the appropriate dimensions.
  • toroidal cores made of a ferrite material come into consideration. Of such
  • Toroidal cores which have an average iron path length of 25 cm, 1.5 cm core height and 2.5 cm 2 core cross-section, for example, the number 40 is required to produce a choke with the specified suitability, but such toroidal cores do not have to be provided with air gaps, because they already have a reduced iron path length of a few 0.01 mm, and thus sufficient shear in their hysteresis loop.
  • the inductance 1 s of the inductor and the total length, that is the sum of the core heights of the stacked inductor cores, also determine the current value at the time when the contactor contacts are separated from Sch, to which the short-circuit partial current i 2 in the current branch in which the contactor is located Seh and the inductor Dr lie, has risen after the large short-circuit partial current i 1 in the secondary current branch has been switched on with the semiconductor contactor, the time profile of the partial currents i 1 and i 2 This results in the particular course i k (t) determined according to the relationship (2).
  • relation (2) like relation (1), only has an exponential expression with the same exponent contains, namely exp -0.654 t once.
  • r B path resistance of a network thyristor Th in m ⁇ in m ⁇ r 1 ohmic resistance of the branch circuit in which the semiconductor contactor is located "r 2 ohmic resistance of the current branch in which Seh and Dr lie, in volt U s lock voltage one Netzthyristor Th, " ⁇ ph RMS value of the generator voltage
  • the path resistance (equivalent resistance) of network thyristors is in the range 0.16 ... 0.2 m ⁇ , the lock voltage is 1.1 volts.
  • a protective device can be used without changes in principle from other than the public AC networks, for example from industrial industrial networks, from on-board networks and the like autonomous networks.
  • the thyristors that are to be deleted or the power thyristors that can be switched off in the future, to which appropriate control means are assigned are to be used as network thyristors.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

La norme VDE 0100, section 732/03.83 est appliquée lors de l'établissement d'entrées d'immeubles d'installations (A) d'alimentation en courant d'immeubles résidentiels. Cette norme prévoit au niveau de l'entrée d'immeuble (E) des organes de protection (Ü) des lignes d'alimentation en courant (1) contre des surintensités de courant, tels que fusibles (Si), dans le cas de court-circuits dans la partie consommatrice de l'installation. Afin de protéger la ligne d'alimentation en courant au-delà de l'entrée d'immeuble lors de court-circuits dans la ligne de branchement (1) de l'immeuble, un organe additionnel (Ü') de protection contre des surintensités de courant est agencé dans chaque ligne ou câble d'alimentation en courant, juste après leur dérivation (NA) du réseau de distribution (N). Chaque organe de protection (Ü') a la forme d'un fusible commutable par un commutateur (L) de protection des lignes électriques actionné par une unité de commande (ST) correspondante. Le fusible débranche des courants excessifs détectés par un détecteur (D) de surintensité de courant et branche à nouveau le courant d'alimentation au moyen d'un organe de surveillance (O) qui indique l'élimination des causes de la surintensité. Les organes de protection d'une ligne de branchement d'un immeuble contre des intensités de courant sont agencés dans un seul logement protecteur (G). Le commutateur (L) de protection de la ligne d'alimentation en courant a la forme d'un contacteur électromécanique (Sch) de couplage impédance-capacité (Dr), d'un contacteur de couplage semi-conducteur avec deux thyristors de réseau antiparallèles (Th1, Th2) ou d'une connexion en série de ces deux possibilités, avec des unités de commande appropriées à chaque cas.
EP19880902143 1987-03-12 1988-03-09 Dispositif protecteur contre des surintensites de courant pour des installations d'alimentation en courant d'immeubles residentiels, industriels et similaires Withdrawn EP0304456A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3708005 1987-03-12
DE19873708005 DE3708005A1 (de) 1987-03-12 1987-03-12 Ueberstromschutzvorrichtung fuer stromversorgungsanlagen von wohn- und betriebsgebaeuden und dergleichen gebaeuden

Publications (1)

Publication Number Publication Date
EP0304456A1 true EP0304456A1 (fr) 1989-03-01

Family

ID=6322897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880902143 Withdrawn EP0304456A1 (fr) 1987-03-12 1988-03-09 Dispositif protecteur contre des surintensites de courant pour des installations d'alimentation en courant d'immeubles residentiels, industriels et similaires

Country Status (4)

Country Link
EP (1) EP0304456A1 (fr)
JP (1) JPH01503033A (fr)
DE (1) DE3708005A1 (fr)
WO (1) WO1988007283A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2303005A (en) * 1995-07-01 1997-02-05 Ampy Automation Digilog Controlling electrical supply to a consumer
US9806641B2 (en) 2014-11-06 2017-10-31 Rockwell Automation Technologies, Inc. Detection of electric motor short circuits
US9748873B2 (en) 2014-11-06 2017-08-29 Rockwell Automation Technologies, Inc. 5-pole based wye-delta motor starting system and method
US10074497B2 (en) 2014-11-06 2018-09-11 Rockwell Automation Technologies, Inc. Operator coil parameter based electromagnetic switching
US9722513B2 (en) 2014-11-06 2017-08-01 Rockwell Automation Technologies, Inc. Torque-based stepwise motor starting
US10393809B2 (en) 2014-11-06 2019-08-27 Rockwell Automation Technologies, Inc. Intelligent timed electromagnetic switching
US10141143B2 (en) 2014-11-06 2018-11-27 Rockwell Automation Technologies, Inc. Wear-balanced electromagnetic motor control switching
US9806642B2 (en) 2014-11-06 2017-10-31 Rockwell Automation Technologies, Inc. Modular multiple single-pole electromagnetic switching system and method
US10361051B2 (en) 2014-11-06 2019-07-23 Rockwell Automation Technologies, Inc. Single pole, single current path switching system and method
FR3032837B1 (fr) * 2015-02-17 2017-02-24 Commissariat Energie Atomique Systeme de protection selective d'un reseau electrique et procede de protection associe
RU2703287C1 (ru) * 2018-10-08 2019-10-16 Акционерное общество "Корпорация "Стратегические пункты управления" АО "Корпорация "СПУ - ЦКБ ТМ" Токоограничивающее устройство с разделенным фидерным групповым реактором по числу потребителей
CN109560544A (zh) * 2018-12-03 2019-04-02 国网新疆电力有限公司阿克苏供电公司 一种基于继电保护与智能重合闸的配电网自愈方法及应用

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1537727A (en) * 1924-05-24 1925-05-12 Gen Electric Automatic reclosing circuit-breaker system
US2609421A (en) * 1951-04-11 1952-09-02 Ite Circuit Breaker Ltd Reclosing circuit breaker
DE1166910B (de) * 1957-06-08 1964-04-02 Concordia Maschinen Und Elek Z Schaltungsanordnung zum Steuern der Kurzunterbrechung von Hochspannungs-Leistungsschaltern
DE3111255A1 (de) * 1981-03-21 1982-09-30 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart "energieversorgungssystem"
DE3121409C2 (de) * 1981-05-29 1983-10-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Blockeinschub
US4363064A (en) * 1981-07-27 1982-12-07 The United States Of America As Represented By The Secretary Of The Navy Overcurrent protection system
EP0096601B1 (fr) * 1982-05-17 1987-01-28 Merlin Gerin Bloc fonctionnel de distribution terminale basse tension
DE3219876A1 (de) * 1982-05-27 1983-12-01 Schaltbau GmbH, 8000 München Ueberstromausloeser
EP0119187B1 (fr) * 1983-03-17 1988-12-07 Hans Hawlan Système pour la distribution d'énergie électrique
EP0209765B1 (fr) * 1985-07-15 1992-09-30 Siemens Aktiengesellschaft Distributeur d'installation électrique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8807283A1 *

Also Published As

Publication number Publication date
DE3708005A1 (de) 1988-09-22
DE3708005C2 (fr) 1989-12-28
WO1988007283A1 (fr) 1988-09-22
JPH01503033A (ja) 1989-10-12

Similar Documents

Publication Publication Date Title
DE69937860T2 (de) Schutzschalter mit Lichtbogenfehlerschutz und PTC-Elemente zum Schutz gegen Kurzschluss und Überlastung
DE69935650T2 (de) Energieverteilungssystem mit durch über Stromleitungen übertragene Signale ,Fernrückstellbaren Leistungsschaltern
DE102009022508A1 (de) Safety-Schaltanlage für Solaranlagen
EP3552289B1 (fr) Disjoncteur basse tension
EP0280759A1 (fr) Agencement de câbles de puissance électriques pour la protection contre les explosions de gaz et/ou de mélanges poussière/air, en particulier pour l'exploitation au fond
EP0304456A1 (fr) Dispositif protecteur contre des surintensites de courant pour des installations d'alimentation en courant d'immeubles residentiels, industriels et similaires
DE3909064A1 (de) Netzfreischalter
EP3226013B1 (fr) Capteur de courant différentiel
DE3032790A1 (de) Motorschutzschaltung
DE3842883A1 (de) Elektrische beleuchtungseinrichtung und insbesondere fuer diese geeignete schutzschaltung
DE2821138A1 (de) Einstueckige elektrische einrichtung
DE2710625B2 (de) Kurzschlußschutzeinrichtung für ein Bordnetz großer Leistung
EP1011183B1 (fr) Disposition de circuit de protection de courant de défaut à la terre
DE3879641T2 (de) Statischer Auslöser mit externer Versorgung.
DE19946098C2 (de) Fehlerstromschutzeinrichtung
DE1173978B (de) Phasenvergleichs-Schutzrelaissystem
DE730733C (de) Einrichtung zum selbsttaetigen Abschalten von elektrischen Anlagen beim Auftreten von Isolationsfehlern
DE102015106867A1 (de) Auslösung eines Erdungsschalters einer Schaltanlage
DE19944409A1 (de) Verfahren zur fehlerartabhängig empfindlichen Auslösung einer Differenzstromschutzeinrichtung, und Differenzstromschutzeinrichtung mit fehlerartabhängiger Empfindlichkeit
DE2852317A1 (de) Elektrische sicherheitseinrichtung zur schnellabschaltung eines elektrischen netzstromkreises
EP1051786B1 (fr) Configuration de circuit de protection
DE617225C (de) Schutzschaltung gegen die beim Bruch vom Nulleiter auftretenden zu hohen Beruehrungsspannungen der Nulleiter innerhalb von Verteilungsnetzen
EP1074079A1 (fr) Disjoncteur
DE716744C (de) Durch Sicherungen abschaltbare elektrische Anlage
DE19719739A1 (de) Spannungs-Schaltvorrichtung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19881104

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH LI NL

17Q First examination report despatched

Effective date: 19901210

19U Interruption of proceedings before grant

Effective date: 19920515

19W Proceedings resumed before grant after interruption of proceedings

Effective date: 19921028

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920917