EP1244124A1 - A spring-operated energy accumulation control for medium and high-voltage circuit breakers - Google Patents
A spring-operated energy accumulation control for medium and high-voltage circuit breakers Download PDFInfo
- Publication number
- EP1244124A1 EP1244124A1 EP01830197A EP01830197A EP1244124A1 EP 1244124 A1 EP1244124 A1 EP 1244124A1 EP 01830197 A EP01830197 A EP 01830197A EP 01830197 A EP01830197 A EP 01830197A EP 1244124 A1 EP1244124 A1 EP 1244124A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- shaft
- opening
- closing
- crank
- 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.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
- H01H3/3005—Charging means
- H01H3/3021—Charging means using unidirectional coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
- H01H3/3005—Charging means
- H01H3/3026—Charging means in which the closing spring charges the opening spring or vice versa
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
- H01H2003/3084—Kinetic energy of moving parts recuperated by transformation into potential energy in closing or opening spring to be used in next operation
Definitions
- the present invention concerns a spring-operated energy accumulation control for medium and high-voltage circuit breakers, hereinafter to be referred to more simply as spring-operated control, and, more particularly, concerns a power device of the said spring-operated control.
- Figure 1 shows that, using either the crank 4 or the motor 5, the shaft 6 can be made to rotate in the direction of the arrow 7, so that, in its turn, it will cause the rotation of the crank 8; passing its bottom dead centre position, the said crank 8 completes the tensioning of the closing spring 2 and comes to a stop when the roller 9 of the cam 10 comes into contact with the closing release device 11 ( Figure 2).
- the lever 12 Given the constant profile of the cam 10, the lever 12 will remain stationary during this phase and the pole 1 of the circuit breaker will therefore remain open. During the tensioning of the closing spring 2 the ratchet wheel 13 ensures that the tensioning will proceed in one direction only.
- the starting position is the one illustrated by Figure 4, i.e.:
- the circuit breaker is ready to perform a first opening (O) by unblocking the opening release device 23.
- control still has the energy - in the tensioned closing spring 2 - for performing a further closing (C) and opening (O) cycle.
- control described above has as its principal drawback the constructional complexity that essentially derives from a very large number of components, including - for example - the presence of at least two shafts, at least two cams and one or two dampers.
- the spring-operated energy accumulation control for medium- and high-voltage circuit breakers constituting the object of the present invention overcomes the aforesaid drawbacks and the power device of the proposed control as characterized in the claims comprises of a first shaft, which is fixed in the control housing and carries a partially toothed ratchet wheel (hereinafter referred to more simply as “toothed wheel”) that can rotate about its longitudinal axis; a second shaft, likewise fixed in the control housing and having its axis parallel to and eccentric with respect to the axis of the first shaft, that carries the first end of a crank that rotates around the second shaft axis, the said toothed wheel being associated with a ratchet device and carrying also a dragging means capable of rotating the said crank into a desired position; the toothed wheel also carries a blocking means to bring it to a halt against a closing release device and a means for connecting the free end of a closing spring of which the other end is anchored to the base of the control;
- a latch is associated with the said toothed wheel to engage a toothed portion of the said wheel, thus permitting the wheel to rotate only in one direction.
- Known auxiliary contacts of the circuit breaker position indicator are controlled by the said release device associated with the second end of the crank.
- the control also comprises a mechanical means for preventing the carrying out of erroneous manoeuvres when the circuit breaker is closed.
- the toothed wheel is made to rotate by means of the ratchet device engaging with the toothed portion of the wheel to permit the means linked to the closing spring to rotate until it goes beyond its lower dead centre position, thus making the said spring tensioned; the tensioning of the closing spring comes to an end when the said blocking means comes to rest against the closing release device; once the tensioning of the spring has come to an end, the toothed portion of the said wheel is situated outside the action of the ratchet device; in this phase the crank is still in line with the said manoeuvering bar and in this position the known lever mechanisms, transmission shaft and opening spring keep the circuit breaker open.
- the crank will remain in this position, while the toothed wheel will continue its rotation until the means linking it to the closing spring reaches its top dead centre position.
- the toothed wheel recuperates the residual energy of the closing spring and comes to a halt in a non-return position established by the point where the ratchet device and the latch engage with the toothed portion of the wheel.
- the circuit breaker pole is closed, the opening spring is tensioned, the opening release device is set, while the closing spring is slackened and conserves only residual energy. From this condition an opening action will unblock the aperture release device, thus freeing the crank, which can now rotate in the direction contrary to the toothed wheel to open the circuit breaker pole by means of the opening spring, the transmission shaft and the known lever mechanisms.
- the principal advantages of the present invention derive from the fact that the power device of the control is made up of a small number of parts, that no regulation of any the various parts is needed during the assembly phase, that all the control organs are mounted on a single base plate, which renders assembly easy and ensures good access the various parts.
- Other advantages of the present invention are constituted by the fact that all the components of the kinematic chain that bring about the closing and the opening of the circuit breaker work in tension and are arranged in one and the same action plane without any shafts that transfer the action onto other planes, an arrangement that assures also absence of play and transverse components in torsion or bending in the supports, the housing and the cross bars of the control and the circuit breaker with almost complete absence of vibrations while the circuit breaker is being operated.
- FIGS 6 to 11 are schematic views showing the control in different operating phases.
- Figure 6 shows the shaft 30 that carries the partially toothed wheel 31 and is also provided with an eccentric extension 32 on which there is mounted a first end of the crank 33.
- the figure indicates that the said wheel is partially toothed and can therefore engage with the ratchet device 34, which can be moved by means of the lever 35 or the electric motor 36 and also continuously engages with the latch 37.
- the figure further indicates that the wheel 31 is provided with a dragging tooth 38 that receives a blocking roller 39; the wheel 31 is also provided with the pin 40 extended through the surface thereof upto passing throug a housing plate (not shown) bearing a circular opening wherein the pin moves in order to connect the free end of the closing spring 41 with the toothed wheel 31 by means of the bar 42 positioned beyond said housing plate.
- the said crank 33 carries a release roller 43.
- the figure also shows a closure release device 44 and an opening release device 45, against which - as will be explained later - there come to a halt, respectively, the blocking roller 39 and the release roller 43.
- the said other end of the crank is also rotatably connected with the first end of the manoeuvering bar 46 that has its other end connected to the lever mechanisms 47, 48, 49, 51, 52, the transmission shaft 50 and the opening spring 53 to close the circuit breaker pole 54, which in the figure is shown in its open position.
- Figure 6 shows the control in its rest position, i.e. with the closing spring 41 slack, the opening spring 53 slack and the circuit breaker pole 54 open.
- the crank 33 is in line with the manoeuvering bar 46, so that the open position of the circuit breaker pole 54 is stable and invariable in time with the service manoeuvres. This position is reached in a gradual manner at the end of the opening manoeuvre without there being any need for a damping device.
- the toothed wheel 31 is made to rotate in an anti-clockwise direction (arrow F), either manually by means of the lever 35 or electrically by means of the motor 36, via the ratchet device 34, which engages with the toothed rim of the wheel 31, to enable the connecting pin 40 of the closing spring 41 to rotate beyond its bottom dead centre and thus to tension the said closing spring 41; the tensioning of the closing spring terminates when the said blocking roller 39 comes to rest against the closure release device 44; once the tensioning of the closing spring 41 has been completed, the toothed rim of the wheel 31 is outside the action range of the ratchet device 34; it can be seen from the figure that the crank bar 33 does not undergo any displacement in this phase and it therefore remains in line with the manoeuvering bar 46, so that the lever mechanisms 47, 48, 49, 51, 52, the transmission shaft 50 and the opening spring 53 likewise do not undergo any change of position and therefore keep the circuit breaker pole 54 open.
- arrow F anti-clockwise direction
- a subsequent action which may be either manual or electrical, unblocks the closure release device 44, thus freeing the toothed wheel 31 and allowing it to rotate under the action of the closing spring 41.
- the dragging tooth 38 is in contact with the other end of the crank 33 until the release roller 43 comes to rest against the said opening release device 45 to restrain the crank 33; during this rotation the crank 33 drags the manoeuvering bar 46 and thus displaces the lever mechanisms 47, 48, 49, which in their turn tension the opening spring 53 and - at one and the same time - cause the transmission shaft 50 to rotate in the direction of the arrow F', thus rotating the lever mechanisms 51 and 52 and closing the circuit breaker pole 54.
- the crank 33 remains in the said position, where it is retained by the opening release device 45, while the toothed wheel 31 continues its rotation until the pin 40 for connecting the closing spring 41 attains its upper dead centre position.
- the toothed wheel 31 recuperates the residual energy of the closing spring 41, coming to a halt in a non-return position defined by the engagement of the ratchet device 34 and the latch 37 with the toothed rim of the wheel 31.
- the circuit breaker pole 54 is closed, the opening spring is tensioned, the opening release device 45 is set and the closing spring 41 is slack and conserves only some residual energy.
- an opening action be it manual or electrical, will unblock the opening release device 45, thus freeing the crank 33 and enabling it to rotate in a clockwise direction to open the circuit breaker pole 54 via the opening spring 53, the lever mechanisms 47, 48, 49, 51, 52 and the shaft 50.
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
A spring-operated energy accumulation control for medium and high-voltage
circuit breakers.
A first shaft (30) carrying a partially toothed ratchet wheel (31) that can rotate
about its longitudinal axis and a second shaft (32) having its axis parallel to and
eccentric with respect to the axis of the first shaft (30) and carrying the first end of a
crank (33) that rotates around the second shaft axis, the said toothed wheel (31) is
associated with a ratchet device (34) and carries a dragging means (38) and a blocking
means (39) to bring it to a halt against a closing release device (44); the toothed wheel
carries also means (40) for connecting the free end of a closing spring (41) and the
said crank (33) carries an opening release device (45) at its second end which is linked
to the first end of a manoeuvering bar (46) that in association with the lever
mechanisms (47, 48, 49, 51, 52), the transmission shaft (50) and the opening spring
(53) cause the closing and opening of a circuit breaker pole (54).
Description
- The present invention concerns a spring-operated energy accumulation control for medium and high-voltage circuit breakers, hereinafter to be referred to more simply as spring-operated control, and, more particularly, concerns a power device of the said spring-operated control.
- The technical field of such spring-operated controls is that of medium and high-voltage circuit breakers, either in SF6 gas, under vacuum or based on other circuit breaking principles and either in frontal or lateral versions.
- The operating principle of the power mechanism of known spring-operated controls will be described hereinafter by reference to the appended Figures 1, 2, 3, 4 and 5, which illustrate the said mechanism in a schematic manner.
- Figure 1 shows that, using either the
crank 4 or themotor 5, theshaft 6 can be made to rotate in the direction of thearrow 7, so that, in its turn, it will cause the rotation of thecrank 8; passing its bottom dead centre position, the saidcrank 8 completes the tensioning of theclosing spring 2 and comes to a stop when theroller 9 of thecam 10 comes into contact with the closing release device 11 (Figure 2). - Given the constant profile of the
cam 10, thelever 12 will remain stationary during this phase and thepole 1 of the circuit breaker will therefore remain open. During the tensioning of theclosing spring 2 theratchet wheel 13 ensures that the tensioning will proceed in one direction only. - Turning now to Figure 3, it can be seen how either a manual or an electrical action will cause the release of the
device 11. Under the action of theclosing spring 2 and thecrank 8 thecam 10 rotates in the direction of thearrow 7 and thus causes theclosing lever 12, theshaft 14 and thecrank 15 to rotate in the direction of thearrow 16. - At this point the
traction bar 17, thecranks transmission shaft 20 and thebar 22 will bring about the closing of thepole 1 of the circuit breaker, this at the expense of the energy accumulated in theclosing spring 2, at the same time commencing the tensioning of theopening spring 3. At the end of this phase, thelever 12 remains set by means of theopening release device 23 in contact with theroller 24. - It can be seen from Figure 4 that the
cam 10 completes its movement regulated by thedamper 25, while thecrank 8, after passing its top dead centre position, makes it possible to recuperate the residual energy in the closing spring by means of theratchet wheel 13. - At this point the
pole 1 of the circuit breaker is closed, theopening spring 3 is tensioned, theclosing release device 23 is set and theclosing spring 2 is slack and therefore conserves only residual energy. - It will readily be understood that an opening action, be it manual or electrical, will unblock the
opening release device 23, thus permitting thelever 12 to rotate in the direction of thearrow 16. At this point the energy accumulated in theopening spring 3, acting through therotating shafts lever mechanisms opening damper 26, will bring about the opening of thepole 1 of the circuit breaker. - At the end of this phase the
pole 1 of the circuit breaker and the control will again find themselves in the condition described in Figure 1, with the sole difference that thecrank 8 has moved forward due to the accumulation of residual energy in theclosing spring 2. - For the purposes of realizing an opening-closing-opening cycle (hereinafter referred to as the O-C-O cycle), the starting position is the one illustrated by Figure 4, i.e.:
- the
circuit breaker pole 1 is closed: - the
opening spring 3 is tensioned; - the
opening release device 23 is set. - The cycle is realized by repeating the phases described in Figure 2 and as now briefly recapitulated:
- using either the
crank 4 or themotor 5, theshaft 6 is made to rotate (in the direction of the arrow 7 ) until thecrank 8, after passing its bottom dead centre position, completes the tensioning of theclosing spring 2 and comes to a stop when theroller 9 of thecam 10 comes into contact with theclosing release device 11. -
- In the condition illustrated by Figure 5 the situation is as follows:
- the
circuit breaker pole 1 is closed: - the
opening spring 3 is tensioned; - the
opening release device 23 is set; - the
closing spring 2 is tensioned; - the
closing release device 11 is set. - Using only the energy accumulated in the control, the circuit breaker is ready to perform a first opening (O) by unblocking the
opening release device 23. - In this condition the control still has the energy - in the tensioned closing spring 2 - for performing a further closing (C) and opening (O) cycle.
- Although it is both functional and reliable, the control described above has as its principal drawback the constructional complexity that essentially derives from a very large number of components, including - for example - the presence of at least two shafts, at least two cams and one or two dampers. This leads to further drawbacks that are constituted by the cost of the control, its size and its poor flexibility when it has to be adapted to the various configurations and the different conditions in which it may have to be used. Over and above this, maintenance of the control and its overhaul while in service may create some operational difficulties.
- The spring-operated energy accumulation control for medium- and high-voltage circuit breakers constituting the object of the present invention overcomes the aforesaid drawbacks and the power device of the proposed control as characterized in the claims comprises of a first shaft, which is fixed in the control housing and carries a partially toothed ratchet wheel (hereinafter referred to more simply as "toothed wheel") that can rotate about its longitudinal axis; a second shaft, likewise fixed in the control housing and having its axis parallel to and eccentric with respect to the axis of the first shaft, that carries the first end of a crank that rotates around the second shaft axis, the said toothed wheel being associated with a ratchet device and carrying also a dragging means capable of rotating the said crank into a desired position; the toothed wheel also carries a blocking means to bring it to a halt against a closing release device and a means for connecting the free end of a closing spring of which the other end is anchored to the base of the control; the said crank carries an opening release device at its second end, the said second end also being linked to the first end of a manoeuvering bar that, in its turn, is linked by its other end to known lever mechanisms, the transmission shaft and the opening spring for closing and opening the circuit breaker pole.
- Furthermore, a latch is associated with the said toothed wheel to engage a toothed portion of the said wheel, thus permitting the wheel to rotate only in one direction.
- Known auxiliary contacts of the circuit breaker position indicator are controlled by the said release device associated with the second end of the crank.
- The control also comprises a mechanical means for preventing the carrying out of erroneous manoeuvres when the circuit breaker is closed.
- The principal mode of functioning of the various parts included in the power device of the control forming the object of the present invention will now be described.
- The toothed wheel is made to rotate by means of the ratchet device engaging with the toothed portion of the wheel to permit the means linked to the closing spring to rotate until it goes beyond its lower dead centre position, thus making the said spring tensioned; the tensioning of the closing spring comes to an end when the said blocking means comes to rest against the closing release device; once the tensioning of the spring has come to an end, the toothed portion of the said wheel is situated outside the action of the ratchet device; in this phase the crank is still in line with the said manoeuvering bar and in this position the known lever mechanisms, transmission shaft and opening spring keep the circuit breaker open. From this condition either a manual or an electrical action will cause the unblocking of the closing release device, thus liberating the toothed wheel, which will now be able to rotate under the action of the closing spring and, during the said rotation, the dragging means will remain in contact with the second end of the crank until the release means associated with the second end of the said crank comes to a halt against the said opening release device and thus bars the further progress of the crank; during this rotation the crank will drag the said manoeuvering bar, which - in its turn - will move the known lever mechanisms and transmission shaft to close the circuit breaker and, at one and the same time, tension the opening spring. The crank will remain in this position, while the toothed wheel will continue its rotation until the means linking it to the closing spring reaches its top dead centre position. The toothed wheel recuperates the residual energy of the closing spring and comes to a halt in a non-return position established by the point where the ratchet device and the latch engage with the toothed portion of the wheel. At this stage the circuit breaker pole is closed, the opening spring is tensioned, the opening release device is set, while the closing spring is slackened and conserves only residual energy. From this condition an opening action will unblock the aperture release device, thus freeing the crank, which can now rotate in the direction contrary to the toothed wheel to open the circuit breaker pole by means of the opening spring, the transmission shaft and the known lever mechanisms.
- The principal advantages of the present invention derive from the fact that the power device of the control is made up of a small number of parts, that no regulation of any the various parts is needed during the assembly phase, that all the control organs are mounted on a single base plate, which renders assembly easy and ensures good access the various parts. Other advantages of the present invention are constituted by the fact that all the components of the kinematic chain that bring about the closing and the opening of the circuit breaker work in tension and are arranged in one and the same action plane without any shafts that transfer the action onto other planes, an arrangement that assures also absence of play and transverse components in torsion or bending in the supports, the housing and the cross bars of the control and the circuit breaker with almost complete absence of vibrations while the circuit breaker is being operated. This makes it possible to avoid the use of dampers in the opening and closing phases and leads to a compact and economic supporting structure. Further advantages of the present invention are provided by the fact that the opening and closing times of the circuit breaker are constant, that the danger of undesired operations of the circuit breaker is eliminated, that the opening and closing release devices are identical and require only a minimal release energy, and that it is impossible to modify the control position when maneuvering in the direction opposite to the circuit breaker pole.
- The invented spring-operated energy accumulation control for medium and high-voltage circuit breakers will now be described in greater detail together with various phases of the opening and closing cycle with reference to an example and the help of drawings in which
- Figures 6 to 11 are schematic views showing the control in different operating phases.
- Figure 6 shows the
shaft 30 that carries the partiallytoothed wheel 31 and is also provided with aneccentric extension 32 on which there is mounted a first end of thecrank 33. The figure indicates that the said wheel is partially toothed and can therefore engage with theratchet device 34, which can be moved by means of thelever 35 or theelectric motor 36 and also continuously engages with thelatch 37. The figure further indicates that thewheel 31 is provided with adragging tooth 38 that receives ablocking roller 39; thewheel 31 is also provided with thepin 40 extended through the surface thereof upto passing throug a housing plate (not shown) bearing a circular opening wherein the pin moves in order to connect the free end of theclosing spring 41 with thetoothed wheel 31 by means of thebar 42 positioned beyond said housing plate. At its other end the saidcrank 33 carries arelease roller 43. The figure also shows aclosure release device 44 and anopening release device 45, against which - as will be explained later - there come to a halt, respectively, theblocking roller 39 and therelease roller 43. The said other end of the crank is also rotatably connected with the first end of themanoeuvering bar 46 that has its other end connected to thelever mechanisms transmission shaft 50 and theopening spring 53 to close thecircuit breaker pole 54, which in the figure is shown in its open position. - The functioning of the power device will now be explained by reference to Figures 6 to 11.
- Figure 6 shows the control in its rest position, i.e. with the
closing spring 41 slack, theopening spring 53 slack and thecircuit breaker pole 54 open. In this condition thecrank 33 is in line with themanoeuvering bar 46, so that the open position of thecircuit breaker pole 54 is stable and invariable in time with the service manoeuvres. This position is reached in a gradual manner at the end of the opening manoeuvre without there being any need for a damping device. - At this point - as can be seen in Figure 7 - the
toothed wheel 31 is made to rotate in an anti-clockwise direction (arrow F), either manually by means of thelever 35 or electrically by means of themotor 36, via theratchet device 34, which engages with the toothed rim of thewheel 31, to enable the connectingpin 40 of theclosing spring 41 to rotate beyond its bottom dead centre and thus to tension the said closingspring 41; the tensioning of the closing spring terminates when the saidblocking roller 39 comes to rest against theclosure release device 44; once the tensioning of theclosing spring 41 has been completed, the toothed rim of thewheel 31 is outside the action range of theratchet device 34; it can be seen from the figure that thecrank bar 33 does not undergo any displacement in this phase and it therefore remains in line with themanoeuvering bar 46, so that thelever mechanisms transmission shaft 50 and theopening spring 53 likewise do not undergo any change of position and therefore keep thecircuit breaker pole 54 open. - As can be seen from Figure 8, a subsequent action, which may be either manual or electrical, unblocks the
closure release device 44, thus freeing thetoothed wheel 31 and allowing it to rotate under the action of theclosing spring 41. During this rotation thedragging tooth 38 is in contact with the other end of thecrank 33 until therelease roller 43 comes to rest against the saidopening release device 45 to restrain thecrank 33; during this rotation thecrank 33 drags themanoeuvering bar 46 and thus displaces thelever mechanisms opening spring 53 and - at one and the same time - cause thetransmission shaft 50 to rotate in the direction of the arrow F', thus rotating thelever mechanisms circuit breaker pole 54. In this phase thecrank 33 remains in the said position, where it is retained by theopening release device 45, while thetoothed wheel 31 continues its rotation until thepin 40 for connecting theclosing spring 41 attains its upper dead centre position. - As shown in Figure 9, the
toothed wheel 31 recuperates the residual energy of theclosing spring 41, coming to a halt in a non-return position defined by the engagement of theratchet device 34 and thelatch 37 with the toothed rim of thewheel 31. At this point thecircuit breaker pole 54 is closed, the opening spring is tensioned, theopening release device 45 is set and theclosing spring 41 is slack and conserves only some residual energy. - From this condition, as shown in Figure 10, an opening action, be it manual or electrical, will unblock the
opening release device 45, thus freeing thecrank 33 and enabling it to rotate in a clockwise direction to open thecircuit breaker pole 54 via theopening spring 53, thelever mechanisms shaft 50. - At the end of this action the
circuit breaker pole 54 and the control will once again find themselves in their initial positions (as described in Figure 6) except for the more advanced position of thetoothed wheel 31 due to the recovery of the residual energy of the closing spring. - When carrying out an opening-closing-opening (O-C-O) cycle, the starting position of the control is thus as follows (see Figure 9):
-
circuit breaker pole 54 closed; - opening
spring 53 tensioned; - opening
release device 45 set. - When the
closing spring 41 becomes tensioned (as described above by reference to Figure 6), the control attains the following condition (see Figure 11): -
circuit breaker pole 54 closed; - opening
spring 53 tensioned; - opening
release device 45 set; - closing
spring 41 tensioned; - closing
release device 44 set. - When the
circuit breaker pole 54 is closed, a mechanical means capable of preventing the accidental unblocking of the closing release device 44 (which is not shown in the figures) makes it impossible to carry out erroneous operations of closing thecircuit breaker pole 54 until such time as the operation is triggered by the unblocking of theopening release device 44. - At this point the circuit breaker - with only the energy accumulated in the control - is ready for carrying out a first opening (O) by means of the unblocking of the
opening release device 45, on completion of which it will assume the position shown in Figure 7. - Subsequently, the control, thanks to the still tensioned closing
spring 41, will have sufficient energy for carrying out a further closing-opening (C-O) cycle in accordance with the phases illustrated by Figures 8, 9 and 10.
Claims (4)
- A spring-operated energy accumulation control for medium and high-voltage circuit breakers that comprises lever mechanisms (18-47, 19-48, 49, 21-51, 22-52), a trasmission shaft (20-50) and an opening spring (3-53) for bringing about the closing of the circuit breaker pole (1-54), characterized in that it comprises a first shaft (30) that is fixed in the control housing and carries a partially toothed wheel (31) with ratchet gear devices that rotates around the longitudinal axis of the said shaft; a second shaft (32), likewise fixed in the control housing, which has the axis parallel to and eccentric with respect to the axis of the first shaft (30) and carries a first end of a crank (33) that rotates about the axis of the said second shaft (32); and further in that the said toothed wheel (31) is associated with a ratchet device (34) and also carries a dragging device (38) to make the said crank (33) rotate into a desired position; the toothed wheel also carries a blocking means (39) to bring it to a halt against closing release device (44), a means (40) to connect the free end of a closing spring (41) that has its other end fixed to the control base; the said crank (33) carries at its other end a release means (43) to bring it to a halt against an opening release device (45) and is also rotatably connected by means of the said other end to a manoeuvering bar (46) that, in its turn, is associated by means of its own other end with the said lever mechanisms (47, 48, 49, 51, 52), the transmission shaft (50) and the opening spring (53) to close and open the circuit breaker pole (54).
- A spring-operated energy accumulation control in accordance with Claim 1, characterized in that it comprises - associated with the said partially toothed wheel (31) - a ratchet (37) to avoid the wheel (31) rotating in a direction other than the desired one.
- A spring-operated energy accumulation control in accordance with either of the preceding claims, characterized in that the said release means (43) associated with the second end of the said crank (33) controls known auxiliary contacts of the position indicator of the circuit breaker.
- A spring-operated energy accumulation control in accordance with any one of the preceding claims, characterized in that it comprises a mechanical means to prevent the carrying out of erroneous manoeuvres when the circuit breaker is closed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01830197A EP1244124A1 (en) | 2001-03-21 | 2001-03-21 | A spring-operated energy accumulation control for medium and high-voltage circuit breakers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01830197A EP1244124A1 (en) | 2001-03-21 | 2001-03-21 | A spring-operated energy accumulation control for medium and high-voltage circuit breakers |
Publications (1)
Publication Number | Publication Date |
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EP1244124A1 true EP1244124A1 (en) | 2002-09-25 |
Family
ID=8184456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP01830197A Withdrawn EP1244124A1 (en) | 2001-03-21 | 2001-03-21 | A spring-operated energy accumulation control for medium and high-voltage circuit breakers |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1901324A3 (en) * | 2006-09-18 | 2009-03-04 | Schaltbau GmbH | Vacuum switch |
EP2204827A3 (en) * | 2008-12-31 | 2013-09-11 | LS Industrial Systems Co., Ltd | Circuit breaker with delayed rotatable cam for spring motor |
CN113113270A (en) * | 2021-04-14 | 2021-07-13 | 西安西电开关电气有限公司 | Closing keeping and opening tripping system |
Citations (4)
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US3689721A (en) * | 1971-09-16 | 1972-09-05 | Westinghouse Electric Corp | Circuit breaker including ratchet and pawl spring charging means and ratchet teeth damage preventing means |
DE2420492A1 (en) * | 1974-04-25 | 1975-10-30 | Siemens Ag | Motorised drive for switchgear with energy store - has drive motor feed cct. with limit switch dependent on store tension state |
US5280258A (en) * | 1992-05-22 | 1994-01-18 | Siemens Energy & Automation, Inc. | Spring-powered operator for a power circuit breaker |
EP0847065A1 (en) * | 1996-12-06 | 1998-06-10 | AEG Sachsenwerk GmbH | Drive device for a circuit breaker |
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US3689721A (en) * | 1971-09-16 | 1972-09-05 | Westinghouse Electric Corp | Circuit breaker including ratchet and pawl spring charging means and ratchet teeth damage preventing means |
DE2420492A1 (en) * | 1974-04-25 | 1975-10-30 | Siemens Ag | Motorised drive for switchgear with energy store - has drive motor feed cct. with limit switch dependent on store tension state |
US5280258A (en) * | 1992-05-22 | 1994-01-18 | Siemens Energy & Automation, Inc. | Spring-powered operator for a power circuit breaker |
EP0847065A1 (en) * | 1996-12-06 | 1998-06-10 | AEG Sachsenwerk GmbH | Drive device for a circuit breaker |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1901324A3 (en) * | 2006-09-18 | 2009-03-04 | Schaltbau GmbH | Vacuum switch |
CN101150024B (en) * | 2006-09-18 | 2012-08-29 | 沙尔特宝有限公司 | Vacuum switch |
EP2204827A3 (en) * | 2008-12-31 | 2013-09-11 | LS Industrial Systems Co., Ltd | Circuit breaker with delayed rotatable cam for spring motor |
CN113113270A (en) * | 2021-04-14 | 2021-07-13 | 西安西电开关电气有限公司 | Closing keeping and opening tripping system |
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