WO2019004876A1 - Предохранительное устройство - Google Patents

Предохранительное устройство Download PDF

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Publication number
WO2019004876A1
WO2019004876A1 PCT/RU2018/050066 RU2018050066W WO2019004876A1 WO 2019004876 A1 WO2019004876 A1 WO 2019004876A1 RU 2018050066 W RU2018050066 W RU 2018050066W WO 2019004876 A1 WO2019004876 A1 WO 2019004876A1
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WIPO (PCT)
Prior art keywords
spring
release
fixed
safety device
case
Prior art date
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PCT/RU2018/050066
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English (en)
French (fr)
Russian (ru)
Inventor
Алексей Анатольевич ТОКАРЕВ
Иван Павлович ЛАВРОВ
Игорь Николаевич МАРЧЕНКО
Original Assignee
Общество С Ограниченной Ответственностью "Свердловэлектро-Силовые Трансформаторы" (Ооо "Свэл-Силовые Трансформаторы")
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Application filed by Общество С Ограниченной Ответственностью "Свердловэлектро-Силовые Трансформаторы" (Ооо "Свэл-Силовые Трансформаторы") filed Critical Общество С Ограниченной Ответственностью "Свердловэлектро-Силовые Трансформаторы" (Ооо "Свэл-Силовые Трансформаторы")
Priority to EA202090171A priority Critical patent/EA036803B1/ru
Priority to MDA20200005A priority patent/MD4836C1/ro
Publication of WO2019004876A1 publication Critical patent/WO2019004876A1/ru

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage

Definitions

  • the invention relates to the field of electrical engineering and can be used in electrical installations with a voltage class up to 20 kV to protect a single-phase power or instrument transformer from a short circuit in the secondary circuit of a transformer, as well as from overloads in the primary winding of a transformer at rated protection actuation current from 0, 3 A.
  • a fuse is a switching electric device designed to disconnect a protected circuit by destroying specially-designed current-carrying parts under the action of a current exceeding a certain value, followed by extinguishing the arcing that occurs during . authors.
  • the classic design has a high-voltage fuse that contains a cartridge in the form of an insulating tube with contact caps, inside which one or several fusible inserts are placed, which are fixed with the possibility of replacement. Inside the cartridge is placed the trigger indicator, which is pushed out when the fuse is tripped (RF patent, PTL: RU152790, H01H 85/055, H01C 7/12, 06.20.2015).
  • the gap of the low-melting conductor is the only section of the discontinuity, which leads to the precise operation of the fuse. In this case, the fuse loses performance.
  • a low-melting fuse conductor can have a wide variety of damage that can lead to different effects, ranging from separating several parallel narrow sections to general destruction of the low-melting conductor without high-impedance breaking.
  • Impulse currents often lead to a substantial mechanical load of the low-melting conductor and to very different current distribution in the areas of the low-melting conductor.
  • a release is a device mechanically connected to an electrical switch (or embedded in it) that releases a holding device in the mechanism of a circuit breaker and causes the switch to automatically trip at a given current response.
  • Such safety devices include an electromagnetic release and a free release mechanism.
  • the release controls the specified current value of the protected circuit and acts on the mechanism of free tripping, disconnecting the power supply network, if a short circuit or overvoltage occurs in the protected circuit.
  • the safety device with magnetic release is reset.
  • the device maintains its performance after operation (http://allrefrs.ru/4-17276.html; https://electric-220.ru/news/tok_rascepitelja_avtomaticheskogo_vykljuchatelja/2014-04-22-587)
  • a safety device (see ibid.) Is known, which contains a flat case in which a direct current electromagnetic release device and a free release mechanism are placed. Electromagnetic release is a solenoid with a spring-loaded core, which is connected with a moving power contact. Electrically, the coil of the solenoid is connected in series to the power circuit by means of leads extending outside the housing.
  • the mechanism of free tripping is made in the form of a system of hinged-connected levers connecting the on and off buttons of the switch with a moving contact node.
  • the electromagnetic release contains a magnetic core with a magnetizing winding located on the frame, an anchor interacting with a moving pusher that is spring-loaded relative to the magnetic core and acts on the rail of the free tripping mechanism.
  • the release contains an output terminal and a terminal with which it is electrically connected to the wire of a three-phase electric circuit.
  • the magnetic core of the inductor is made of upper and lower parts.
  • the mechanism of free tripping is designed as a system of pivotally connected levers connecting the on and off buttons of the switch. The actuation is fixed by the extended power button, which corresponds to the de-energized state of the release.
  • RF patent PTL RU78985, H01H 73/36, 10.12.2008, FIG. 2.
  • a direct current electromagnetic release device is a release device that is triggered when a current exceeds a specified value, and that is triggered by a current flowing directly in the controlled circuit.
  • electromagnetic releases have a very high speed (up to hundredths of a second)
  • a safety device with a direct current electromagnetic release reacts to pulsed overvoltages and even to an occasional short-term increase in current in a controlled circuit. This leads to unreasonable shutdown of the consumer.
  • the use of the button in the known safety devices as a trigger for switching on in the extended state is not reliably informative, which does not exclude the possibility of re-enabling the safety device and creating an emergency. As a result, the safety of identified known safety devices for the consumer is reduced.
  • the free-decoupling mechanism is a system of pivotally connected levers, which complicates it.
  • the reciprocating movement of the movable core of the inductor is converted into rotational movement of the levers.
  • This requires a high inductive ability of the inductance of the release to form the corresponding force of the moving core, which complicates the design of the fixed core of the coil, and, therefore, complicates the entire safety device as a whole.
  • the housing design of the identified known safety devices is not standardized, which, for example, does not allow them to be used as a fuse-insert (GOST 2213-79), whose housing (cartridge) is a closed insulating housing with conductive contact tips. This deprives the identified known safety devices that use an electromagnetic release, versatility and limits the scope of their use.
  • the electromagnetic release switch includes a magnetic circuit with a magnetizing winding, an anchor that is spring-loaded relative to the magnetic circuit.
  • the device is made of insulating material in the form of a pipe, the ends of which are closed rigidly fixed to them, made of conductive material, contact caps with a cylindrical contact lug coaxially with the axial line of the body, axial through holes are made in the caps, inside the case, an electromagnetic release and a free release mechanism are placed at opposite ends, while the magnetic circuit is made in the form of a ring, with the force inserted into the body of the mouth and tightly, around the perimeter covers a coil of inductance with a fixed core, in which a through axial hole is made, coaxial with the axis of the housing, in addition, a release control unit is inserted in the device, consisting of a parallel-connected self-resetting fuse and a varistor, to which the first and second terminals inductance coil is connected in parallel, while the first output is electrically connected to the magnetic core, and the second is electrically connected to the contact cap attached to the same
  • the outer end of the sleeve is made in the form of a fungus; monofilament is a fishing line; inside the through hole in the armature on the spring side, parallel to the walls of the hole, is made with a stepped recess, with the base of the step facing the inside of the case; the second end of the trigger pointer is spring-loaded on the side of the conductive contact washer, which is for the second end of the pointer guide and is pressed to the end of the case with a corresponding contact cap at a distance from its inner surface, providing the possibility of axial reciprocating movement of the pointer to a fixed value; the guide element in the mechanism of free tripping is made in the form of a cup, which is inserted into the device case with the possibility of reciprocating movement and facing the bottom towards the release, while the sleeve is fixed in the bottom of the cup, and inside the cup there is a conductive breaking spring inside which is coaxially freely placed depreciation spring, while the second end of the breaking spring is fixed
  • a safety device including a housing with an electromagnetic release and a free release mechanism placed in it, while the electromagnetic release includes a magnetic circuit with a magnetizing winding, an anchor that is spring-loaded relative to the magnetic circuit, " are an integral part of the claimed method and provide implementation, and, therefore, ensure the achievement of the stated technical result.
  • the device case is made of insulating material in the form of a pipe, the ends of which are closed rigidly fixed to them, made of conductive material, contact caps with a cylindrical contact lug coaxially with the axial line of the case, which simplifies installation and replacement of the safety device during use.
  • the fuse case (cartridge) is a closed insulating case with conductive contact tips.
  • the case of the declared safety device can be standardized both in appearance and in overall dimensions, in accordance with GOST 2213-79, which gives the declared safety device versatility and allows to use as a fuse-insert, expanding the area use, as well as simplifying and increasing the ease of operation and safety of the safety device (ease of installation when replacing, excluding connecting installation works, since on each side the contact caps are transformed into a cylindrical contact protrusion coaxially with the axial line of the housing, which facilitates the installation of the declared safety device).
  • Execution of the protective device case in the form of a pipe allows placing the electromagnetic release device and the free tripping mechanism inside the case at opposite ends, which ensures the operability of the claimed device.
  • the claimed form of the housing allows the magnetic core to be made in the form of a ring, this allows us to simplify the design of the electromagnetic release, namely: to perform an inductance coil in the form of a solenoid, simplifying the shape of the fixed core as much as possible.
  • the magnetic core is made in the form of a ring, is inserted into the device body tightly, and around the perimeter it covers the inductance with a fixed core, the operability of the electromagnetic system with the optimum value of electromagnetic induction is ensured.
  • the device includes a trip unit control unit consisting of a self-resetting fuse and a varistor connected in parallel, to which the inductance coil is connected in parallel, one of which is electrically connected to the magnetic circuit, and the second is electrically connected to the contact cap attached to the same end of the housing.
  • a trip unit control unit consisting of a self-resetting fuse and a varistor connected in parallel, to which the inductance coil is connected in parallel, one of which is electrically connected to the magnetic circuit, and the second is electrically connected to the contact cap attached to the same end of the housing.
  • Self-resetting fuses are devices that limit the current in the circuit, but unlike conventional fuses, they do not lose their functionality after they are triggered.
  • self-resetting fuses are PPTC thermistors.
  • the short name PPTC Polymeric positive temperature coefficient coefficient device
  • PPTC Polymeric positive temperature coefficient coefficient device
  • the principle of operation of the self-resetting fuse (hereinafter referred to as thermistor) is based on the ability of the polymer to change the conductive structure when heated.
  • the polymer At room temperature, the polymer has a crystalline structure, so that the movement of charged particles occurs in an orderly manner, and the current in the circuit is determined by the operating value of the load resistance.
  • the current in the circuit increases sharply, heating the polymer.
  • the thermistor triggers, namely the phase state of the polymer changes from crystalline to amorphous.
  • the resistance of the thermistor increases dramatically and the current in the circuit is determined by the value of its resistance.
  • the thermistor changes from a conducting state to a discontinuous state.
  • the thermistor remains in a “hot” state, providing constant protection until current passes through it, causing a transition to this state, or until the causes of its operation are eliminated.
  • the thermistor cools and its resistance returns to the nominal value.
  • the resistance of the varistor is determined by the operating voltage.
  • a varistor is used to suppress surge overvoltages, including the occurrence of random peak overvoltages, which is widely known ().
  • the current through the release coil depends on the magnitude of their resistance.
  • the rated operation mode at the rated current that does not trigger the thermistor transition to the breaking state
  • all the current passes through the thermistor since the resistance of the inductance coil and the varistor is much higher than the resistance of the thermistor. Trip does not work.
  • the thermistor during the lifetime of the pulse does not have time to change its resistance to a discontinuous state and remains in the conducting state.
  • the resistance of the varistor decreases and a current flows through it corresponding to its resistance (damping of the overvoltage pulses with the varistor).
  • the electric mode of the inductor does not change and the release does not work.
  • the current in the circuit increases sharply, heating the polymer thermistor.
  • the thermistor triggers and the thermistor changes from a conducting state to a discontinuous state.
  • Maximum varistor resistance (varistor closed). In this case, all the current passes through the electromagnetic release, which opens the emergency circuit.
  • the release responds selectively to changes in the current in the protected circuit, namely does not respond to changes in current caused by pulsed overvoltages.
  • the possibility of unreasonable shutdown of the consumer is excluded.
  • a synergistic effect occurs, which results in the possibility of using the performance of the electromagnetic release while simultaneously ensuring selectivity, namely: the release of the release only under the action of current with the network frequency , excluding operation in case of pulsed overvoltages or from random pulsed overloads.
  • the control unit of the release is connected to the leads of the inductor by means of a board made in the form of a washer, which takes into account the geometric shape of the housing and the magnetic core and makes it possible to fix it in the housing.
  • the two-sided mounting plate allows it to be fixed in the device case with the possibility of providing electrical contact of the corresponding inductance coils with the magnetic core and the contact cap.
  • the electrical contact of the respective leads of the inductor with the magnetic core and the contact cap is ensured by the fact that the double-sided board is provided with a lower and upper conductor layer bordering the perimeter, and with a conductive contact pin attached to the magnetic core of the inductor layer is pressed to the inner surface of the cap, while the leads of the inductance are soldered to the lower and upper conductive Nost of the circuit board, respectively.
  • the release control unit performs the function of an overload criterion, which makes it possible to organize the release of the release only under the action of a current with a mains frequency exceeding the specified value.
  • the claimed safety device with an electromagnetic release device in contrast to the known ones, works selectively, excluding operation in the event of pulsed overvoltages or from random pulsed overloads.
  • the ends of the case are closed tightly fixed on them, made of conductive material, contact caps with a cylindrical contact protrusion coaxially with the axial line of the case.
  • axial through holes are made in caps coaxially with the axis of the housing.
  • the proposed design of the contact cap allowed to introduce into the inventive safety device an operation indicator, which is located inside the case at the end opposite to the electromagnetic releaser.
  • the first end of the pointer is placed coaxially in the contact protrusion of the corresponding contact cap with the possibility of going out, and the second end of the pointer is placed coaxially inside the fuse body.
  • the first ends of the shut-off and damping spring are fixed on the second end of the trigger indicator, it is possible to axially reciprocate the pointer depending on the state of the springs (compressed, decompressed), i.e. depending on the state of the safety device (rupture, conductive, respectively). As a result, the position of the pointer corresponds to the state of the safety device.
  • the second end of the trigger pointer is spring-loaded on the side of the conductive contact washer, which is a guide for the second end of the pointer and is pressed to the end of the case with a corresponding contact cap at a distance from its inner surface, allowing the axial reciprocating movement of the pointer to a fixed value at a distance that provides the working stroke of the pointer when the safety device is installed in a working state, in which its first end is inside the contact cap.
  • a space is created for compressing the pointer spring, which limits the stroke of the pointer, preventing the second end from moving and fixes the position of the first end of the pointer inside the contact cap and outside of it both at the conductive and the rupture state of the declared safety device.
  • the position of the pointer is informatively reliable, corresponding to the state of the safety device.
  • the proposed design of the pointer is autonomous, not allowing the re-activation of the monitored circuit by means of the trigger indicator (in the prototype - the trigger indicator button for supplying voltage), which increases the safety of using the declared safety device.
  • the pointer does not exert electrical influence on the protected circuit, in particular, does not cause unwanted leakage currents, since it has a mechanical principle of operation, which also increases the safety of the device as a whole, since it eliminates unreasonable shutdown of the consumer.
  • a trigger indicator in the safety device as well as the possibility of using it to turn on automation as a shock trigger indicator, meet the requirements of the standard “AC fuses for a voltage of 3 kV and above” GOST 2213-79, which, in conjunction with the stated version the case of the safety device, provides the possibility of standardization of the device and gives the declared safety device the property of universality.
  • the anchor spring-loaded relative to the magnetic circuit, is placed on the end of the coil, facing the inside of the case, with the possibility of reciprocating movement in the direction perpendicular to the axial line of the core of the coil.
  • the anchor has a through hole, the axis of which is parallel to the axis of the body. Under the action of a spring-loaded spring, the anchor occupies an initial position, in which the axial line of the hole made in it is at a distance from the axial line of the housing passing through the hole and shifted away from the spring of the armature.
  • the through hole of the armature is made with the possibility of fixing a hook made at the end of the sleeve connected to the breaking spring.
  • the fixing of the hook is carried out due to the fact that the hook is made in the form of a fungus; inside the through hole in the anchor from the spring side, parallel to the walls, there is a stepped recess, with the base of the step facing inward.
  • the hook when it enters the hole in the anchor, depresses the spring of the anchor, is installed on the step, after which the anchor under the action of the spring returns to its original state.
  • the elasticity of the armature spring allows the armature to move freely in the direction of the magnetic conductor under the action of the hook that enters its hole (if there is no anchoring effect of the electromagnetic induction of the coil).
  • the free trip mechanism contains a guide element having a circumference in cross section, which is inserted into the device body coaxially, with force, with the possibility of reciprocating movement, which makes it possible for it to perform its main function - to maintain the direction of movement.
  • a sleeve made of conductive material fixed in it fixedly and coaxially.
  • a conductive breaking spring inside of which a damping spring is placed coaxially freely. Since the first end of the tripping spring is electrically connected to the corresponding contact cap, and the second end of the tripping conductive spring is fixed to a sleeve also made of a conductive material, the sleeve is electrically connected to the corresponding contact cap through the breaking current spring.
  • a monofilament is stretched, which can be used as a fishing line.
  • One end of the monofilament is fixed outside on the second pin cap, and the second end is rigidly connected inside the cup to the second end of the shock-absorbing spring, the first end of which is fixed on the second end of the trigger pointer. Since the sleeve is fixed in the guide element stationary, the result is a kinematic connection of the pointer, damping spring, guide element and monofilament, which allows them to move simultaneously under the influence of muscular effort exerted on the monofilament.
  • the springs are kinematically connected with it, and the protruding end of the sleeve is made in the form of a fungus, with appropriate tension of the springs under the action of the monofilament hook anchor spring, and is installed in the hole on the step made in it.
  • the armature spring and the armature itself are set to their original state, in which the axial line of the hole made in it is at a distance from the axial line of the housing passing through the hole and shifted away from the armature spring, which prevents the hook from spontaneously sliding out .
  • the damping spring Since the second end of the damping spring is connected to the monofilament, after the hooking is completed, when the muscular effect on the monofilament stops, the damping spring returns to its original state, dragging the second end of the monofilament, which also returns to its original tensioned state with compressed springs, fixing the position of the damping spring in the case. As a result, when the hook is opened, the damping spring takes on the shock effect of the bottom of the glass.
  • the guide element can be made, for example, in the form of a glass, which simultaneously performs the function of the casing of the mechanism and the guide element.
  • the glass is inserted into the device body coaxially with the possibility of reciprocating movement and facing the bottom of the release. From the bottom of the glass acts sleeve, fixed in the glass coaxially and motionless.
  • a conductive breaking spring is placed inside the cup, inside which a damping spring is coaxially placed. The second end of the breaking spring is fixed on the inner side of the glass on the sleeve, and the other end of the shock-absorbing spring is connected to monofilament.
  • the implementation of the guide element in the form of a glass and the placement of springs inside the glass ensures the stability of the position of the springs relative to each other, both in a static state and when stretching, which ensures the operability of the device.
  • These attachment of the second ends of the springs provide a kinematic connection with the glass, which also ensures the operability of the device, and, therefore, ensures the achievement of the stated technical result.
  • the body of the safety device in the form of a pipe, the ends of which are closed rigidly fixed to them, made of conductive material, contact caps with a cylindrical contact lug coaxially with the centerline of the body, as well as the introduction of an operation indicator comply with the requirements of the standard AC fuses for voltage of 3 kV and above GOST 2213-79, i.e.
  • the declared safety device can be standardized both in appearance and dimensions, in accordance with GOST 2213-79, which gives the declared safety device versatility and allows to use as a fuse - insert, expanding the area of use, as well as simplifies and improves the usability and safety of the safety device (ease of installation when en, exception of connecting installation works, since on each side of the contact caps go into a cylindrical contact ledge coaxially with the axial line of the housing, which contributes to and facilitates the installation of the declared safety device).
  • the introduction of the operation indicator provides the possibility of receiving a visual signal about the presence of an emergency situation and the operation of the safety device, which is informatively reliable.
  • inventive safety device of the control unit of the release eliminates the possibility of unreasonable shutdown of the consumer, since the control unit of the release performs the function of overload criterion and allows organizing the release of the release only under the action of a current with a network frequency exceeding the specified value.
  • the claimed safety device with an electromagnetic release device in contrast to the known ones, works selectively, excluding operation in the event of pulsed overvoltages or from random pulsed overloads.
  • the claimed safety device solves the problem of creating an improved current safety device that eliminates the possibility of triggering by an accidental short-term peak current overload or by current overload caused by a pulse overvoltage.
  • the implementation of the claimed safety device is achieved technical result:
  • the claimed safety device comprises a housing 1 in the form of a pipe with contact caps 2, 3 with a cylindrical contact lug, an electromagnetic release 4, a release control unit 5, a free release mechanism 6, an operation indicator 7.
  • Electromagnetic release 4 contains a magnetic core 8, an inductor 9 with a magnetic core 10 and an anchor 11.
  • the release control assembly 5 contains a self-resetting fuse 12 (thermistor) connected in parallel and a varistor 13. Assembly 5 is assembled on a two-sided circuit board 14.
  • the free release mechanism 6 comprises a guide element 15, a sleeve 16, a shut-off spring 17, a damping spring 18, and a monofilament 19.
  • the housing 1 of the device is made of insulating material in the form of a pipe, the ends of which are closed rigidly fixed to them, made of conductive material, contact caps 2, 3 with a cylindrical contact lug coaxially with the axial line of the housing.
  • axial through holes are made coaxially with the axis of the housing 1.
  • electromagnetic release 4 hereinafter - release
  • free release mechanism 6 hereinafter - release mechanism
  • the magnetic circuit 8 is made in the form of a ring, with force inserted into the device case 1 and tightly, around the perimeter it covers the inductor 9 with a fixed core 10, in which a through axial hole is made, coaxial with the axis of the case 1.
  • the inductance 9 is connected in parallel by the first and second leads, the first lead is electrically connected to the magnetic circuit 8, and the second is electrically connected to the contact cap 3 fixed on the same end of the housing 1.
  • the double-sided mounting board 14 is made in the form of a washer (FIG. 2) fixed in the device case 1 with the possibility of providing electrical contact of the corresponding leads of the inductance 9 with the magnetic core 8 and the contact cap 3.
  • the double-sided board 14 is bordered along the perimeter the conductive layer is pressed to the magnetic conductor 8 of the inductance coil by the 4 contact cap 3 fixed on the side of the release.
  • the upper bordering around the perimeter of the conductive layer of the board 14 is pressed to the inner surface of the cap 3.
  • the first and second terminals of the inductance are soldered to the lower and upper conductive surface of the circuit board, respectively.
  • Spring-loaded anchor 11 is placed on the end of coil 9, facing the inside of the housing 1, with the possibility of reciprocating movement in the direction perpendicular to the axial line of the core 10 of the coil 9.
  • the anchor 11 has a through hole 20, the axis of which is parallel to the axis of the body 1.
  • the spring 21 takes the initial position, in which the axial line of the hole 20 made in it is at a distance from the axial line of the housing 1 passing through the hole and shifted away from the spring 21 of the armature 11.
  • Inside the through The holes in the anchor 11 from the spring 21 side parallel to the walls of the hole are made with a stepped recess, while the base of the step is facing the inside of the case.
  • the pickup indicator 7 is located at the end of housing 1, opposite to the releaser 4.
  • the first end 22 of the pointer 7 is placed coaxially in the contact lug of the corresponding contact cap 2 with the possibility of going out.
  • the second end 23 of the pointer is placed coaxially inside the housing 1 of the device.
  • Pointer 7 has the possibility of axial reciprocating movement of a fixed value.
  • the second end 23 of the trigger pointer 7 is spring-loaded by the spring 25 on the side of the conductive contact washer 26, which is a guide for the second end 23 of the pointer 7 and is pressed to the end of the body 1 by the corresponding contact cap 2 at a distance from its inner surface, allowing axial reciprocating movement 7 by a fixed amount.
  • the guide element 15 has a circumference in cross section and is inserted into the device body coaxially, with force, with the possibility of reciprocating movement. From the guide element 15 on the side facing the release 4, there is a sleeve 16 fixed in it fixedly and coaxially, made of conductive material, the protruding end of which is adapted to be hooked in the through-hole of the armature 11, which is made to fix the hook made, for example, in the form of a fungus 24.
  • a conductive breaking spring 17 On the opposite side of the guide element 15 is placed a conductive breaking spring 17, inside of which a damping spring 18 is placed coaxially freely.
  • the first end of the release spring 17 is electrically connected to the corresponding contact cap 2, for example, the operation indicator 7 is made of conductive material, and the first end of the release spring is fixed at the second end 23 of the operation indicator 7.
  • the second end of the release spring 17 is fixed on the sleeve 16.
  • the monofilament 19 is stretched, one end of which is fixed externally on the second contact cap 3, for example, terminated in a knot and fixed in the sleeve.
  • the second end of the monofilament is rigidly connected to the second end of the damping spring 18, also, for example, terminated by a knot and fixed in the sleeve.
  • the first end of the depreciation spring is fixed at the second end 23 of the pointer 7. In this case, the monofilament 19 is fixed in the tensioned state.
  • monofilament can be used fishing line.
  • the guide element 15 in the mechanism of free tripping 6 can be made in the form of a cup, which is inserted into the device case 1 with the possibility of reciprocating movement and facing the bottom of the release 4.
  • the sleeve 16 is fixed in the bottom of the cup, and inside the cup a conductive breaking spring 17 , inside of which a damping spring 18 is coaxially placed freely.
  • the second end of the breaking spring 17 is fixed on the inner side of the sleeve on the sleeve 16, and the second end of the damping spring is rigidly connected to torym end monofilament 19 stretched through the sleeve 16.
  • the claimed safety device is assembled as follows.
  • a spring 25 is pushed onto the second end 23 of the trigger pointer 7, which is pressed against the conductive contact washer 26.
  • a damping spring 18 is placed inside the release spring 17.
  • the assembled unit Put the guide element 15 into the cup. In this case, the thread comes out of the sleeve.
  • At the first end 22 of the indicator of operation 7 put on the contact cap 2 and press, turning the cap along the thread, the washer 26 to the body 1 of the device.
  • the release 4 is assembled. Through the holes in the anchor 11 and in the core 10, the coils 9 pull the monofilament 19. The coil 9 with the core 10 and the spring-loaded anchor 11 are inserted into the magnetic core 8. Pull the monofilament 19 through the circuit board 14 and fix it on the core 10 of the coil 9 by stops (not shown). Connect the findings of the coil 4 with the node 5 control release. The assembled unit is inserted into the housing 1 of the device. For reliable fixation of the release inside the housing 1, the release rests on the guide washer 28 fixed in the wall of the housing 1, through which the monofilament 19 is also stretched. Through the hole in the contact cap 3 pull the monofilament and close the opening 3 to the magnet circuit and to the inner surface of the cap 3.
  • the monofilament is brought into a stretched state, for which purpose it is tensioned until the feeling of light resistance of the springs 17, 18.
  • the free end of the thread is fixed with any an aid, for example, is passed through a fixing sleeve and terminated in a knot.
  • the device works as follows. In the initial state, the hook mechanism of the free tripping is at a distance from the anchor corresponding to the length of the monofilament. The first end of the actuation indicator protrudes out of the contact cap 2. To bring the safety device into working condition, pull the monofilament out of the device body by the end fixed outside the cap 3. As a result, the guide element together with the springs 17, 18 begins to move toward the release. Monofilament is pulled out to get a sound signal - a click, which is formed as a result of hitch 24 of the sleeve 16 in the hole 20 of the armature due to the step made in it.
  • a conductive spring connected to it, electrically connected to the cap 2 closes the electrical circuit between the contact caps 2 and 3.
  • the second end of the operation indicator is shifted deep into the housing, carried along by the release spring.
  • the first end of the pointer is fixed inside the contact protrusion of the cap 2.
  • the monofilament is released and it returns to its original tensioned state.
  • the damping spring returns to its original state.
  • a current begins to flow through the device. In normal mode at a rated current that does not trigger the thermistor (transition to the breaking state), all the current passes through the thermistor, since the resistance of the inductance coil and the varistor is much higher than the resistance of the thermistor. Trip does not work.
  • the thermistor during the lifetime of the pulse does not have time to change its resistance to a discontinuous state and remains in the conducting state.
  • the resistance of the varistor is significantly reduced (damping of the overvoltage pulses by the varistor).
  • the electric mode of the inductor does not change and the release does not work.
  • the current in the controlled circuit increases dramatically, heating the polymer of the thermistor.
  • the thermistor triggers and the thermistor changes from a conducting state to a discontinuous state.
  • the resistance of the varistor is much higher than the resistance of the inductor.
  • all the current passes through the electromagnetic release.
  • the anchor compresses its spring and shifts away from the axial body, while simultaneously shifting the hole made in it.
  • the hook slides off the step and opens electrical contact with the release. A “shooting” of the hook occurs and the hook together with the guide element rapidly falls on the shock-absorbing spring, which transmits the impact force to the second end of the trigger indicator and it comes out of the cap 2, indicating that the safety device has been activated

Landscapes

  • Breakers (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Emergency Protection Circuit Devices (AREA)
PCT/RU2018/050066 2017-06-29 2018-06-27 Предохранительное устройство WO2019004876A1 (ru)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EA202090171A EA036803B1 (ru) 2017-06-29 2018-06-27 Предохранительное устройство
MDA20200005A MD4836C1 (ro) 2017-06-29 2018-06-27 Dispozitiv de siguranţă

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2017123107 2017-06-29
RU2017123107A RU2649661C1 (ru) 2017-06-29 2017-06-29 Предохранительное устройство

Publications (1)

Publication Number Publication Date
WO2019004876A1 true WO2019004876A1 (ru) 2019-01-03

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EA (1) EA036803B1 (ro)
GE (1) GEP20217278B (ro)
MD (1) MD4836C1 (ro)
RU (1) RU2649661C1 (ro)
WO (1) WO2019004876A1 (ro)

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CN117872111A (zh) * 2023-12-22 2024-04-12 无锡市三斯特科技有限公司 一种安全性高的高压开关的监测装置

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Publication number Priority date Publication date Assignee Title
RU2685246C1 (ru) * 2018-08-02 2019-04-17 Общество с ограниченной ответственностью "СвердловЭлектро-Силовые трансформаторы" (ООО "СВЭЛ-Силовые трансформаторы) Предохранительное устройство
EA035099B1 (ru) * 2018-08-02 2020-04-27 Общество С Ограниченной Ответственностью "Свердловэлектро-Силовые Трансформаторы" (Ооо "Свэл-Силовые Трансформаторы") Предохранительное устройство

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US20040000983A1 (en) * 2002-06-26 2004-01-01 John Kennedy Multiple conductor indicator
CN201001023Y (zh) * 2007-01-15 2008-01-02 上海盛善电气有限公司 仪器仪表电源保护电路
RU78985U1 (ru) * 2008-07-09 2008-12-10 Открытое акционерное общество "Дивногорский завод низковольтных автоматов" (ОАО "ДЗНВА") Электромагнитный расцепитель автоматического выключателя
RU2407127C2 (ru) * 2006-06-08 2010-12-20 Дэн + Зёне Гмбх + Ко. Кг Токовый предохранитель с дополнительным механическим размыкателем предпочтительно в виде ударника для использования в устройствах защиты от перенапряжения

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GB0205762D0 (en) * 2002-03-12 2002-04-24 Cooper Technologies Co Fuse assembly
RU152790U1 (ru) * 2014-10-23 2015-06-20 Ирина Алексеевна Хатанова Высоковольтный предохранитель для защиты ограничителей перенапряжения нелинейных

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Publication number Priority date Publication date Assignee Title
US20040000983A1 (en) * 2002-06-26 2004-01-01 John Kennedy Multiple conductor indicator
RU2407127C2 (ru) * 2006-06-08 2010-12-20 Дэн + Зёне Гмбх + Ко. Кг Токовый предохранитель с дополнительным механическим размыкателем предпочтительно в виде ударника для использования в устройствах защиты от перенапряжения
CN201001023Y (zh) * 2007-01-15 2008-01-02 上海盛善电气有限公司 仪器仪表电源保护电路
RU78985U1 (ru) * 2008-07-09 2008-12-10 Открытое акционерное общество "Дивногорский завод низковольтных автоматов" (ОАО "ДЗНВА") Электромагнитный расцепитель автоматического выключателя

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117872111A (zh) * 2023-12-22 2024-04-12 无锡市三斯特科技有限公司 一种安全性高的高压开关的监测装置

Also Published As

Publication number Publication date
GEP20217278B (en) 2021-07-26
MD20200005A2 (ro) 2020-07-31
MD4836C1 (ro) 2023-06-30
EA202090171A1 (ru) 2020-04-21
MD4836B1 (ro) 2022-11-30
EA036803B1 (ru) 2020-12-22
RU2649661C1 (ru) 2018-04-05

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