JP2009026971A - Energy accumulation device, and on-load tap changing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact energy accumulation device for an on-load tap changing device which is adaptive to variation in load on a breaking mechanism unit due to temperature variation. <P>SOLUTION: The energy accumulation device has an energy accumulation spring 4 which accumulates energy by movement of a winding-up case 3, an energy accumulation case 5 which moves with released energy of the energy accumulation spring 4, a changeover crank 6 which rotates by the movement of the energy accumulation case 5, catches 8a and 8b which engage crank ratchets 7a and 7b to fix the changeover crank 6 and energy accumulation case 5, a disengagement lever 31 which comes into contact with the catches 8a and 8b by the movement of the winding-up case 3 to disengage the crank ratchets 7a and 7b and catches 8a and 8b from each other, and a temperature-sensitive deformation member 30. The temperature-sensitive deformation member 30 deforms corresponding to temperature variation to drive the disengagement lever 31, and energy accumulated in the energy accumulation spring 4 becomes larger at low temperature than at high temperature because of a shift in contact position between the disengagement lever 31 and catches 8a and 8b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an on-load tap changer capable of coping with a change in load of a shut-off mechanism section due to a change in temperature of an ambient medium, and an energy storage device therefor.

  The switching switch constituting the on-load tap changer inserts a current limiting impedance on the switching circuit in order to suppress the cross current at the time of the bridge between taps during the tap change. When a resistor is used for the current limiting impedance, it is necessary to shorten the energization time of the resistor in order to suppress the heat generation of the resistor and make the resistor capacity compact. For this reason, generally in tap switching, energy necessary for the switching operation is stored in a spring in advance and released at once, and a quick cutting operation is performed in a short time. A portion that stores energy for driving the blocking mechanism is referred to as an energy storage device.

  A conventional typical energy storage device is connected to an electric operation mechanism, transmits a rotational drive force from the electric operation mechanism, an eccentric cam that performs an eccentric operation in response to the rotation of the drive shaft, and an eccentric cam A winding case that performs reciprocating linear motion in response to an eccentric operation, a storage spring that stores energy by linear motion of the winding case, a storage case that performs reciprocating linear motion by the energy released by the storage spring, and a storage case It is connected and rotated by the reciprocating motion of the energy storage case, and engages with a switching crank that transmits the energy released by the energy storage spring as a rotational force to the shut-off mechanism, and a claw provided on the switching crank, and stores the spring energy. And two sets of catches for fixing the switching crank and the energy storage case to each other during the operation.

  The operation at the time of switching the energy storage device is as follows.

(A) Regular position (b) When a switching signal is input to the electric operation mechanism, the drive shaft moves the winding case linearly via the eccentric cam.

  (C) The tripping lever of the winding case disengages the catch and the crank pawl, releases the accumulating spring, and the accumulating case starts moving in the direction of the hoisting case.

  (D) The accumulator case and the switching crank reach the final end position, and the crank pawl engages with the catch.

  The operation of the energy storage device at the next tap switching is as follows. From the normal state (d), the winding case moves in the direction of the catch and disengages the catch and the crank pawl. As the energy storage spring is released, the energy storage case moves, and the catch and the crank pawl engage.

  The switching switch that operates the shut-off mechanism using the stored spring energy as the drive source shuts off the spring energy on the drive side when the surrounding medium becomes cold and the load of the shut-off mechanism, such as an increase in viscous resistance, occurs. Work (energy) due to the load on the mechanism unit may exceed, and tap switching may not be completed and may stop halfway. If the operation stops halfway, the resistor may be energized continuously, causing the resistor to overheat or blow out, possibly resulting in damage to the switching switch.

  Therefore, as disclosed in Patent Document 1, a switching switch having two operating positions has been proposed by providing another set of auxiliary crank claws between the crank claws of the conventional energy storage device. Yes.

  In the circuit of the switching switch disclosed in Patent Document 1, two current limiting resistors, one current contact, and two arc contacts are connected to each tap between the tap and the neutral point of the tap winding. Has been. The order of the switching operation is outlined below.

  (A) The main energized contact, the main arc contact, and the first resistance arc contact are closed and in an operating state. At this time, the load current flows from the neutral point through the main energizing contact.

  (B) The main energizing contact is opened and current is commutated to the main arc contact.

  (C)-(g) The resistance arc contact connected to each tap opens and closes, and the circulating current IC and the load current flow through the current limiting resistance.

  (H) The main arc contact is closed, current flows through the main arc contact, and continuous energization to the resistor is lost.

  (I) The main energizing contact is closed and the switching is completed.

  According to Patent Document 1, when the ambient temperature is higher than normal temperature and the load on the shut-off mechanism is small, the switching operation starts normally and completes normally. That is, switching starts from the operating state (a) and completes in the state (i). At this time, the catch engages with the crank pawl in the operating state (a), and the catch engages with the crank pawl in the state (i) where the switching is completed.

  When the ambient temperature becomes low, the load on the shut-off mechanism increases, so even if switching starts from the operating state (a), the crank cannot rotate to the end, and the catch engages with the auxiliary claw, The switching is finished. That is, the tap switching ends in the state (h). In this case, the main arc contact is energized, and the current limiting resistance is not continuously energized, so that the resistor does not need to be damaged. In the next switching, if the surrounding medium remains at a low temperature, the switching mechanism cannot be completed until the end because the load on the shut-off mechanism is large, and the switching ends from the state (h) to the state (b). After this, when the surrounding medium becomes high temperature, the load on the shut-off mechanism portion is reduced, so that the crank can be rotated to the end, and switching to the normal normal state (a) and (i) is resumed. is there.

  Further, in the case where only the auxiliary claw can be switched due to an increase in the load of the low-temperature cutoff mechanism, the example of Patent Document 2 is known as a device for surely completing the switching.

  Patent Document 2 discloses a conventional energy storage device in which a control cam is attached to an eccentric cam and a roller is attached to an energy storage case.

  When a tap switching signal is input to the electric operation mechanism, torque from the electric operation mechanism rotates the eccentric cam via the drive shaft, linearly moves the winding case, and stores the accumulator spring. The control cam rotates in conjunction with the rotation of the eccentric cam. When the control cam rotates, the control cam moves away from the roller and further deviates from the linear motion track of the energy storage case.

  When the energy storage is completed, the spring energy is released, and the energy storage case starts operating in the direction of the winding case. When normal (normal), the energy storage case and the switching crank reach the final final position, and the catches engage with the catches.

When the shut-off mechanism section increases the load, the energy storage case cannot complete the switching and stops halfway. On the other hand, since the eccentric cam is directly connected to the electric operation mechanism, the eccentric cam rotates to the end regardless of the increase in the load of the blocking mechanism. When the rotation of the control cam connected to the eccentric cam advances, the control cam comes into contact with the roller on the opposite side to the roller that was in contact before the accumulation of energy. The control cam forcibly pushes the energy storage case to the final position via the roller, and the switching can be completed to the end.
JP 54-118523 A Japanese Patent Laid-Open No. 51-130824

  As described above, even when the ambient temperature becomes low and the load of the shut-off mechanism section increases due to an increase in the fluid's viscous resistance, etc., there has been a proposal to prevent resistor continuous energization and resistance overheating by stopping halfway. ing.

  However, the energy storage device for the switching switch described above has the following problems.

  According to the switching sequence, the switching switch opens each contact on the energized side before switching, extinguishes the arc at the arc contact, and turns on each contact on the non-energized side before switching Then, tap switching is performed. Therefore, if the switching proceeds in a state where the arc cannot be extinguished, the contact of the adjacent tap is turned on, which may lead to a short-circuit between taps. Therefore, the sequence at the time of switching must ensure a sufficient arc extinguishing time when the arc contact is opened.

  However, in the above-described conventional switching switch using the energy storage spring energy as the driving source, the energy of the energy storage spring is constant regardless of the temperature of the surrounding medium, so that the viscous resistance decreases when the temperature of the surrounding medium is high. In such a case, the load on the shut-off mechanism is reduced, the switching speed is increased, and the switching time is shortened. Therefore, there is a problem that it is difficult to secure an arc time at the time of switching. Further, in order to solve the problem of securing the switching time when the temperature of the surrounding medium is high while keeping the energy of the stored spring energy constant, the moment of inertia must be increased. For this reason, it is difficult to reduce the size.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a compact on-load tap changer that can cope with a change in the load of the shut-off mechanism section due to a change in the temperature of the surrounding medium, and the same It aims to provide an energy storage device.

  In order to achieve the above object, an energy storage device according to the present invention includes a drive shaft that is coupled to an electric operation mechanism and transmits a rotational driving force from the electric operation mechanism, and an eccentric cam attached to the drive shaft. A hoisting case that reciprocates linearly in response to the rotation of the eccentric cam, an accumulator spring that stores and releases energy by the reciprocating linear motion of the hoisting case, and reciprocates by energy released by the accumulator spring. An accumulator case that performs linear motion, and is connected to the accumulator case, and is rotated by a reciprocating motion of the accumulator case. The energy released by the accumulator spring is transmitted to the shut-off mechanism as a rotational force, and a plurality of A switching crank having a plurality of crank claws, and the switching crank and the energy storage case are engaged with each other while the energy storage spring stores energy. A plurality of catches to be fixed, a release lever that is attached to the winding case, contacts the catch by a reciprocating linear motion of the winding case, and disengages the crank pawl from the catch; and is attached to the winding case And a temperature-sensitive deformation member that deforms in response to a temperature change, wherein the temperature-sensitive deformation member drives the trip lever by deformation in response to the temperature change. , Thereby changing the contact position between the trip lever and the catch, and when the trip lever disengages the catch and the crank pawl, the energy stored in the energy storage spring is at a high temperature. It is comprised so that it may become large at low temperature.

  Further, the on-load tap changer according to the present invention includes a shut-off mechanism, a power storage device that drives the power shut-off mechanism, a common container that contains the energy storage device and the power shut-off mechanism, and is filled with fluid. The load accumulator includes a drive shaft connected to the electric operation mechanism and transmitting a rotational driving force from the electric operation mechanism, and an eccentric cam attached to the drive shaft. A winding case that performs a reciprocating linear motion in response to the rotation of the eccentric cam, a storage spring that stores and releases energy by the reciprocating linear motion of the winding case, and an energy that the energy storing spring releases. An accumulator case that performs a reciprocating linear motion, and a shut-off mechanism portion that is connected to the accumulator case and rotates by the reciprocating motion of the accumulator case and uses the energy released by the accumulator spring as a rotational force. The switching crank having a plurality of crank claws and the plurality of claws provided on the switching crank and engaging the switching crank and the energy storage while the energy storage spring stores energy. A plurality of catches for fixing the case to each other, a release lever attached to the winding case, contacting the catch by a reciprocating linear motion of the winding case, and disengaging the crank claw and the catch; and the winding A temperature-sensitive deformation member that is attached to a case and deforms according to a temperature change, and the temperature-sensitive deformation member drives the trip lever by deformation according to the temperature change, and thereby the trip lever and When the contact position with the catch is changed and the release lever disengages the catch from the crank pawl, the energy is stored in the energy storage spring. Nerugi is that it is configured to be larger at low temperatures than at high temperatures, characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the outstanding interruption | blocking characteristic can be maintained corresponding to the change of the load of the interruption | blocking mechanism part by the temperature change of the surrounding medium of a tap switch at the time of load.

  Hereinafter, an embodiment of a power storage device according to the present invention and an on-load tap changer using the same will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. 1 is a plan view of the energy storage device according to the first embodiment, FIG. 2 is a sectional side view taken along the line II-II in FIG. 1, and FIG. 3 is a front view taken along the arrow III in FIG. . 4 is a plan view showing the vicinity of the winding case shown in FIG. 1, FIG. 5 is a side view taken along the arrow V in FIG. 4, FIG. 6 is a front view taken along the arrow VI in FIG. FIG. 7 is a front sectional view taken along line VII-VII in FIG. 4. Further, FIG. 8 is a plan view showing the catch 8a taken out of FIG. 1, and FIG. 9 is a side view taken along the arrow IX of FIG. 10, 11, and 12 are plan views of the energy storage device of FIG. 1, showing a state when the catch is pulled off. FIG. 10 shows a case where the surrounding medium is in a normal temperature state, and FIG. 11 shows a low temperature. In the case of the state, FIG.

  The accumulator 41 is connected to the electric operation mechanism 200 (see FIGS. 27 and 28), has the drive shaft 1 that transmits the rotational driving force from the electric operation mechanism 200, and the shut-off mechanism 40 via the switching crank 6. (See FIGS. 27 and 28). The eccentric cam 2 is provided coaxially with the drive shaft 1, receives the rotation of the drive shaft 1, and performs an eccentric operation. The winding case 3 receives the eccentric operation of the eccentric cam 2 and performs a reciprocating linear motion. Energy is stored in the energy storage spring 4 by the linear motion of the winding case 3. Further, the energy storage case 5 performs a reciprocating linear motion by the energy released by the energy storage spring 4. Due to the reciprocating motion of the energy storage case 5, the switching crank 6 rotates, and the energy released by the energy storage spring 4 is transmitted to the shut-off mechanism as a rotational force. The switching crank 6 is provided with crank claws 7a and 7b. While the two sets of catches 8a and 8b are engaged with the crank claws 7a or 7b and the spring energy is stored, the switching crank 6 and the storage case are stored. 5 are fixed to each other.

  The winding case 3 is provided with a bimetal plate (temperature-sensitive deformable member) 30 and a tripping lever 31 of a storage case capable of linear motion perpendicular to the bimetal plate 30. The tripping lever 31 has a hooking claw 32 that contacts the bimetal plate 30 at one end thereof. Steps 1H, 10 and 1L are formed on the catches 8a and 8b.

  1 to 3, etc., reference numeral 60 indicates a spring guide shaft, and reference numeral 61 indicates a case guide shaft.

  In the energy storage device of this embodiment having such a configuration, different operations are performed depending on the temperature of the surrounding medium. This will be described below.

  FIG. 10 shows a structural diagram of the energy storage device when the catch is pulled off when the ambient temperature of the switching switch attached with the energy storage device is near room temperature. At normal temperature, the tripping lever 31 is in the position shown in FIG. 10, and when the switching signal is input to the electric operation mechanism, the winding case 3 moves linearly, and the tripping lever 31 of the winding case 3 is stepped by the catch 8a. 10, the engagement between the crank claw 7 a and the catch 8 a is released, the energy storage spring 4 is released, and the switching operation is started.

  Next, consider a case where the temperature of the surrounding medium is lower than room temperature. FIG. 11 shows the state of the energy storage device 41 when the catch 8a is pulled off at this time. The bimetal plate 30 is formed by joining different kinds of metals having different coefficients of thermal expansion, and has a property that the way of bending changes according to temperature change. For this reason, the temperature of the surrounding medium is lowered and is deformed as shown in FIG. Since the trip lever 31 is in contact with the bimetal plate 30 via a hooking claw 32 provided at one end thereof, the trip lever 31 moves in the direction indicated by the arrow 80 with respect to the normal temperature state as the bimetal plate 30 is deformed. At the time of switching, the tripping lever 31 of the winding case 3 disengages the crank pawl 7a while coming into contact with the step 1L of the catch 8a, releases the accumulator spring 4, and starts the switching operation.

  On the other hand, FIG. 12 shows the state of the energy storage device when the catch is pulled off when the temperature of the surrounding medium is higher than room temperature. As the temperature of the surrounding medium rises, as shown in FIG. The trip lever 31 moves in the direction indicated by the arrow 81 with respect to the normal temperature state via the hook claw 32. At the time of switching, the tripping lever 31 of the winding case 3 disengages the crank pawl 7a while contacting the step 1H of the catch 8a, releases the accumulator spring 4, and starts the switching operation.

  In addition, although the above took the case where catch 8a opens engagement as an example, it is the same also about catch 8b.

  Moreover, the state before storing is the state shown in FIG. 1 regardless of the ambient temperature.

  The operation of the present embodiment as described above is as follows.

  Here, the energy of the energy storage spring 4 used for driving is considered.

  When an accumulating spring with a spring constant k and a natural length H0 is used, the spring length H1 before accumulating (FIG. 1), after accumulating the accumulating spring at room temperature (the trip lever is connected to the catch and the crank pawl) Assuming that the spring length H2 (when the combination is removed) (FIG. 10), the spring energy E1 before energy storage and the spring energy E2 after energy storage are as follows.

E1 = (1/2) × k × (H0−H1) ² (1)
E2 = (1/2) × k × (H0−H2) ² (2)
The energy storage spring energy E used for driving at normal temperature is calculated as the difference between the energy stored in the energy storage spring before energy storage from the energy stored after energy storage.

E = E2-E1 (3)
When the trip lever 31 is in contact with the step 10 of the catch 8a and the catch engagement with the crank pawl is released at room temperature, the engagement is released as described above when the temperature of the surrounding medium becomes low. At this time, the trip lever 31 comes into contact with the step 1L of the catch 8a, and when the temperature of the surrounding medium becomes high, the trip lever 31 comes into contact with the step 1H of the catch 8a. That is, the position of the winding case is deviated by t2 and t1 at low temperature and high temperature, respectively, by an amount corresponding to the height of the catch step as compared with the normal temperature. On the other hand, since the energy storage case 5 is determined by the positions of the crank claws 7a and 7b, the position does not change depending on the temperature.

Therefore, if the spring length after energy storage at low temperature is H2L, and the spring length after energy storage at high temperature is H2H,
H2L = H2-t2 (4)
H2L = H2 + t1 (5)
It becomes.

  The post-accumulation spring energy E2L at a low temperature and the post-accumulation spring energy E2H at a high temperature are as follows, respectively.

E2L = (1/2) × k × (H0−H2 + t2) ² (6)
E2H = (1/2) × k × (H0−H2−t1) ² (7)
Since the state before accumulating is the state of FIG. 1 regardless of the ambient temperature, the spring energy E1 before accumulating does not change even when the temperature is low or high. Therefore, the accumulator spring energy EL used for driving at a low temperature and the accumulator spring energy EH used for driving at a high temperature are as follows.

EL = E2L-E1 (8)
EH = E2H-E1 (9)
Comparing equations (2), (3), (6), and (8), the energy storage spring energy EL used for driving at a low temperature is less than the equation (6) compared to the energy storage spring energy E used for driving at room temperature. ) Can be switched with a large energy corresponding to “+ t2”.

  On the other hand, when the energy storage spring energy EH used for driving at high temperature is compared with (2), (3), (7), and (9), the expression (7) The switching can be performed with a small energy corresponding to “−t1”.

  As a result, when the viscous resistance increases at low temperatures, switching can be performed with a large amount of energy, so that a reduction in switching speed and a midway stop can be prevented. Further, when the viscous resistance decreases at a high temperature, switching is performed with a small amount of energy, so that an increase in switching speed can be prevented.

  As described above, according to the present embodiment, it is possible to provide a compact switching switch having a stable switching capability with respect to a change in the load of the shut-off mechanism section due to a temperature change of the surrounding medium.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIG. FIG. 13 is a plan view of the energy storage device according to the second embodiment.

  In the second embodiment, a slope 1S is provided instead of the steps 1H, 10 and 1L provided in the catches 8a and 8b of the first embodiment. The positional relationship according to the change in the ambient temperature of the trip lever 31 is the same as that in the first embodiment.

  In this embodiment, the position of the winding case 3 is deviated at a low temperature and a high temperature by an amount corresponding to the height of the slope 1S provided on the catches 8a and 8b, as compared with the normal temperature. As a result, the energy storage energy EL used for driving at a low temperature can be switched with a larger energy than the energy storage energy E used for driving at a normal temperature, while the energy storage used for driving at a high temperature. The spring energy EH can be switched with a smaller energy than the energy storage spring energy E used for driving at normal temperature.

  As a result, when the viscous resistance increases at low temperatures, switching can be performed with a large amount of energy, so that a reduction in switching speed and a midway stop can be prevented. Further, when the viscous resistance decreases at a high temperature, switching is performed with a small amount of energy, so that an increase in switching speed can be prevented.

  Further, when the contact surface of the catches 8a and 8b with the trip lever 31 is a step, only the number of steps can be selected as the type of stored energy in the ambient temperature range during operation. By setting the inclination, the energy can be finely selected depending on the temperature change. Therefore, a stable switching time can be secured over the ambient temperature range during operation.

  As described above, according to the present embodiment, it is possible to provide a compact switching switch having a stable switching capability with respect to a change in the load of the shut-off mechanism section due to a temperature change of the surrounding medium.

[Third Embodiment]
A third embodiment of the present invention will be described with reference to FIGS. 14 is a plan view of the vicinity of the winding case of the energy storage device according to the third embodiment, FIG. 15 is a side view as viewed from the arrow XV in FIG. 14, and FIG. 16 is a front view as viewed from the arrow XVI in FIG. FIG. 17 is a front sectional view taken along line XVII-XVII in FIG. FIG. 18 is a plan view of the energy storage device of FIG. 14 and shows a state in which the surrounding medium pulls the catch in a normal temperature state. 19 is a front view as seen from the arrow XIX in FIG. 18, and FIG. 20 is a partial side view as seen from the arrow XX in FIG.

  FIG. 21 is a plan view of the energy storage device of FIG. 14 and shows a state when the catch is pulled off when the surrounding medium is in a low temperature state. 22 is a front view as seen from the arrow XXII in FIG. 21, and FIG. 23 is a partial side view as seen from the arrow XXIII in FIG. FIG. 24 is a plan view of the energy storage device of FIG. 14 and shows a state when the catch is pulled off when the surrounding medium is in a high temperature state. 25 is a front view as seen from the arrow XXV in FIG. 24, and FIG. 26 is a partial side view as seen from the arrow XXVI in FIG.

  The hoisting case 3 has a bimetal plate 30 and a hooking claw 32 that contacts the bimetal plate 30 so as to hook the bimetal plate 30 at one end, and a storage case that is rotatable about a shaft 33 provided on the hoisting case 3 as a central axis. A trip lever 31 is provided. Further, the tripping lever 31 has steps 1H, 10 and 1L at one end in contact with the catches 8a and 8b on the opposite side of the hooking claw 32.

  In the energy storage device of this embodiment having such a configuration, as described below, different operations are performed depending on the temperature of the surrounding medium.

  FIG. 18 to FIG. 20 show structural diagrams of the energy storage device when the catch is pulled off when the ambient temperature of the switching switch attached with the energy storage device is near room temperature.

  At normal temperature, the trip lever 31 is in the position shown in FIGS. 18 to 20, and when the switching signal is input to the electric operation mechanism, the winding case 3 moves linearly, and the tripping lever 31 of the winding case 3 is While the step 10 of the trip lever 31 is in contact with the catch 8a, the crank pawl is disengaged, the energy storage spring 4 is released, and the switching operation is started.

  Next, consider a case where the temperature of the surrounding medium is lower than room temperature. The state of the energy storage device when the catch is pulled off at this time is shown in FIGS.

  As the temperature of the surrounding medium decreases, the bimetal plate 30 deforms so as to bend downward as shown in FIGS. Since the trip lever 31 is in contact with the bimetal plate 30 via a hooking claw 32 provided at one end thereof, the trip lever 31 rotates in the direction indicated by the arrow 82 with respect to the normal temperature state as the bimetal plate 30 is deformed. . At the time of switching, the tripping lever 31 of the winding case 3 disengages the crank pawl while bringing the step 1L of the tripping lever 31 into contact with the catch 8a, releases the accumulator spring 4, and starts the switching operation.

  On the other hand, FIGS. 24 to 26 show the state of the energy storage device when the catch is removed when the temperature of the surrounding medium is higher than the normal temperature.

  As the temperature of the surrounding medium rises, as shown in FIG. 24 to FIG. The tripping lever 31 rotates in the direction indicated by the arrow 83 with respect to the normal temperature state via the hooking claws 32. At the time of switching, the tripping lever 31 of the winding case 3 disengages the crank pawl while bringing the step 1H of the tripping lever 31 into contact with the catch 8a, releases the accumulator spring 4, and the switching operation starts.

  In addition, although the above took the case where catch 8a opens engagement as an example, it is the same also about catch 8b.

  The operation of the present embodiment as described above is the same as that shown in the first embodiment.

  At normal temperature, the step 10 of the release lever 31 comes into contact with the catch 8a to disengage the catch from the crank pawl. When the temperature of the surrounding medium becomes low, the engagement is disengaged as described above. At this time, the step 1L of the trip lever 31 comes into contact with the catch 8a, and when the temperature of the surrounding medium becomes high, the step 1H of the trip lever 31 comes into contact with the catch 8a. Therefore, the position of the winding case 3 is shifted at a low temperature and a high temperature by an amount corresponding to the height of the step provided on the tripping lever 31 as compared with the normal temperature.

  For this reason, the energy storage spring EL used for driving at low temperature can be switched with a larger energy than the energy storage spring energy E used for driving at normal temperature, while the energy storage used for driving at high temperature. The spring energy EH can be switched with a smaller energy than the energy storage spring energy E used for driving at normal temperature.

  As a result, when the viscous resistance increases at low temperatures, switching can be performed with a large amount of energy, so that a reduction in switching speed and a midway stop can be prevented. Further, when the viscous resistance decreases at a high temperature, switching is performed with a small amount of energy, so that an increase in switching speed can be prevented.

  As described above, according to the present embodiment, it is possible to provide a compact switching switch having a stable switching capability with respect to a change in the load of the shut-off mechanism section due to a temperature change of the surrounding medium.

[Fourth Embodiment]
With reference to FIG. 27, the on-load tap changer according to the fourth embodiment of the present invention will be described. FIG. 27 is an elevational sectional view schematically showing the on-load tap changer according to the fourth embodiment. This on-load tap changer includes an energy storage device 41 and a shut-off mechanism 40, which are arranged in a transformer container 70 filled with a medium such as insulating oil. In the vicinity of the energy storage device 41 and the shut-off mechanism 40, an energy storage device ambient temperature detector 42 and a shut-off mechanism ambient temperature detector 43 for measuring the ambient temperature of the energy storage device 41 and the shut-off mechanism 40 are installed. A circulation pump 49 is installed outside the transformer container 70. Further, the electric operation mechanism 200 is provided with a temperature difference determination unit 101 that determines the detection results of the energy storage device ambient temperature detector 42 and the shut-off mechanism ambient temperature detector 43. As the energy storage device 41, any one of the energy storage devices 41 described as the above-described first to third embodiments is used.

  The on-load tap changer of this embodiment having such a configuration has the following actions.

  After the switching signal is input to the electric operation mechanism 200, the accumulator ambient temperature detector 42 and the shut-off mechanism ambient temperature detector 43 detect the respective temperatures.

  As described above, the bimetal plate 30 provided in the winding case 3 of the energy storage device 41 is deformed by the ambient temperature of the energy storage device 41 and energy storage spring energy is determined. On the other hand, the load of the blocking mechanism 40 is determined by the viscous resistance due to the ambient temperature of the blocking mechanism 40. Therefore, when there is a difference between the ambient temperature of the energy storage device 41 and the shut-off mechanism 40, the balance between the energy storage spring energy and the load of the shut-off portion is deteriorated, and stable shut-off capability cannot be maintained.

  For this reason, the temperature difference determination unit 101 determines whether the detection results are the same. If the detection results are determined to be the same, the switching operation is performed. If the detection results are determined not to be the same, the circulation is performed. A signal is sent to the pump 49, and the fluid in the container is circulated and stirred until the detection results of the energy storage device ambient temperature detector 42 and the shutoff mechanism ambient temperature detector 43 match, and switching is started when they match. Here, for example, when the temperature difference is equal to or less than a predetermined range, it is determined that they are the same, and when the temperature difference exceeds a predetermined range, it is determined that they are not the same.

  As described above, according to the present embodiment, it is possible to provide a compact switching switch having a stable switching capability with respect to a change in the load of the shut-off mechanism section due to a temperature change of the surrounding medium.

[Fifth Embodiment]
With reference to FIG. 28, the on-load tap changer according to the fifth embodiment of the present invention will be described. FIG. 28 is an elevational sectional view schematically showing the on-load tap changer according to the fifth embodiment. This on-load tap changer includes an energy storage device 41 and a shut-off mechanism 40 having a current limiting resistor 44. In the vicinity of the current limiting resistor 44, a current limiting resistance temperature detector 50 for measuring the temperature of the current limiting resistor is installed. An abnormality determination unit 102 is provided outside. As the energy storage device 41, any one of the energy storage devices 41 described as the above-described first to third embodiments is used.

  The on-load tap changer of this embodiment having such a configuration has the following actions.

  When the energy storage device 41 of the above-described embodiment is used, it has a stable switching time regardless of the ambient temperature as described above. For this reason, the time during which the current limiting resistor 44 is energized at the time of switching is substantially constant. The time of temperature rise of the current limiting resistor 44 at the time of switching is measured for each switching by the current limiting resistance temperature detector 50, and the data is accumulated and observed in the abnormality determination unit 102. If the transition of the temperature rise time of the current limiting resistor 44 is obviously long, it is determined that the switching time is long due to the abnormality of the switching switch, and an abnormality warning is given. By observing the switching time, it is possible to always maintain a switching switch having a stable switching capability.

  As described above, according to the present embodiment, it is possible to provide a switching switch having a stable switching capability.

[Other Embodiments]
Each embodiment described above is merely an example, and the present invention is not limited thereto.

  For example, instead of the steps 1H, 10 and 1L provided on the trip lever in the energy storage device of the third embodiment, the trip lever has a slope similar to the slope 1S provided on the catch in the second embodiment. May be. The operations and effects in this case are the same as in the second embodiment.

  Further, instead of the bimetal plate 30 in the energy storage device of the above embodiment, as another temperature-sensitive deformable member, a plate that gives a displacement motion due to a temperature change may be a plate made of a shape memory material such as an alloy or ceramic. Good.

  Furthermore, the features of the respective embodiments including the “other embodiments” described above may be combined in various ways.

  Further, in the above-described embodiment, the switching sequence having an arc contact has been described as an example for the conventional switching switch, but it can also be applied to a vacuum valve.

It is a top view of the energy storage apparatus concerning a 1st embodiment of the present invention. It is the II-II arrow directional cross-sectional view of FIG. It is a III arrow front view of FIG. It is a top view which takes out and shows the winding case vicinity of FIG. It is a V arrow side view of FIG. FIG. 5 is a front view taken along the arrow VI in FIG. 4. FIG. 7 is a front sectional view taken along line VII-VII in FIG. 4. It is a top view which takes out and shows catch 8a of Drawing 1. It is a IX arrow side view of FIG. It is a top view of the energy storage apparatus of FIG. 1, Comprising: It is a figure which shows a state when a surrounding medium pulls a catch in a normal temperature state. It is a top view of the energy storage apparatus of FIG. 1, Comprising: It is a figure which shows a state when a surrounding medium pulls a catch in a low temperature state. It is a top view of the energy storage apparatus of FIG. 1, Comprising: It is a figure which shows a state when a surrounding medium pulls a catch in a high temperature state. It is a top view of the energy storage apparatus which concerns on the 2nd Embodiment of this invention. It is a top view of the winding case vicinity of the energy storage apparatus which concerns on the 3rd Embodiment of this invention. It is a XV arrow side view of FIG. It is a XVI arrow front view of FIG. FIG. 15 is a front sectional view taken along line XVII-XVII in FIG. 14. It is a top view of the energy storage apparatus of FIG. 14, Comprising: It is a figure which shows a state when a surrounding medium pulls a catch in a normal temperature state. It is the XIX arrow front view of FIG. It is a XX arrow partial side view of FIG. It is a top view of the energy storage apparatus of FIG. 14, Comprising: It is a figure which shows a state when a surrounding medium pulls a catch in a low temperature state. It is a XXII arrow front view of FIG. It is a XXIII arrow partial side view of FIG. It is a top view of the energy storage apparatus of FIG. 14, Comprising: It is a figure which shows a state when surrounding medium pulls a catch in a high temperature state. It is a XXV arrow front view of FIG. It is a XXVI arrow partial side view of FIG. It is an elevation sectional view showing typically an on-load tap changer concerning a 4th embodiment of the present invention. It is an elevation sectional view showing typically an on-load tap changer concerning a 5th embodiment of the present invention.

Explanation of symbols

1: Drive shaft 2: Eccentric cam 3: Hoisting case 4: Accumulating spring 5: Energizing spring 6: Energizing case 6: Switching crank 7a, 7b: Crank claws 8a, 8b: Catch 10, 1L, 1H: Step 1S: Inclination 30: Bimetal Board (temperature-sensitive deformation member)
31: Trip lever 32: Hook 33: Shaft 40: Shut-off mechanism 41: Energy storage device 42: Energy storage device ambient temperature detector 43: Interrupt mechanism ambient temperature detector 44: Current limiting resistor 49: Circulating pump 50: Current limiting resistance temperature detector 60: Spring guide shaft 61: Case guide shaft 70: Transformer container 101: Temperature difference determination unit 102: Abnormality determination unit 200: Electric operation mechanism

Claims (11)

A drive shaft connected to the electric operation mechanism and transmitting a rotational driving force from the electric operation mechanism;
An eccentric cam attached to the drive shaft;
A winding case that performs reciprocating linear motion in response to rotation of the eccentric cam;
An energy storage spring that stores energy by reciprocating linear motion of the winding case and releases the energy;
An energy storage case that performs a reciprocating linear motion by energy released by the energy storage spring;
A switching crank that is connected to the energy storage case, rotates by the reciprocating motion of the energy storage case, transmits energy released by the energy storage spring to the shut-off mechanism as a rotational force, and includes a plurality of crank claws. ,
A plurality of catches that engage the crank claws and fix the switching crank and the energy storage case to each other while the energy storage spring stores energy;
A release lever attached to the winding case, contacting the catch by reciprocating linear motion of the winding case, and releasing the engagement between the crank pawl and the catch;
A temperature-sensitive deformation member that is attached to the winding case and deforms according to a temperature change;
A load accumulator of a load tap changer comprising:
The temperature-sensitive deformation member drives the trip lever by deformation according to a temperature change, thereby changing the contact position between the trip lever and the catch, and the trip lever engages the catch and the crank pawl. The energy stored in the energy storage spring when the power is removed is configured to be larger at a low temperature than at a high temperature,
Energy storage device characterized by.   The said catch has a level | step difference in a contact part with the said trip lever, It is comprised so that it may contact with the said trip lever in the level | step difference position which changes with temperature differences. Energy storage device.   The catch has an inclined portion at a contact portion with the trip lever, and is configured to come into contact with the trip lever at a different position of the tilt portion due to a difference in temperature. Item 2. The energy storage device according to Item 1.   The accumulator according to claim 1, wherein the trip lever has a step at a contact portion with the catch, and is configured to contact the catch at a different step position depending on a temperature difference. Force device.   2. The trip lever has an inclined portion at a contact portion with the catch, and is configured to contact the catch at a different position of the inclined portion due to a difference in temperature. The energy storage device described in 1.   The energy storage device according to any one of claims 1 to 5, wherein the temperature-sensitive deformation member is a bimetal plate.   The energy storage device according to claim 1, wherein the temperature-sensitive deformation member is a member made of a shape memory substance. A load tap changer having a shut-off mechanism part, an accumulator that drives the shut-off mechanism part, and a common container that contains the accumulator and the shut-off mechanism part and is filled with fluid,
The energy storage device is:
A drive shaft connected to the electric operation mechanism and transmitting a rotational driving force from the electric operation mechanism;
An eccentric cam attached to the drive shaft;
A winding case that performs reciprocating linear motion in response to rotation of the eccentric cam;
An energy storage spring that stores energy by reciprocating linear motion of the winding case and releases the energy;
An energy storage case that performs a reciprocating linear motion by energy released by the energy storage spring;
A switching crank that is connected to the energy storage case, rotates by the reciprocating motion of the energy storage case, transmits energy released by the energy storage spring to the shut-off mechanism as a rotational force, and includes a plurality of crank claws. ,
A plurality of catches for engaging the plurality of claws provided on the switching crank and fixing the switching crank and the energy storage case to each other while the energy storage spring stores energy;
A release lever attached to the winding case, contacting the catch by reciprocating linear motion of the winding case, and releasing the engagement between the crank pawl and the catch;
A temperature-sensitive deformation member that is attached to the winding case and deforms according to a temperature change;
Have
The temperature-sensitive deformation member drives the trip lever by deformation according to a temperature change, thereby changing the contact position between the trip lever and the catch, and the trip lever engages the catch and the crank pawl. The energy stored in the energy storage spring when the power is removed is configured to be larger at a low temperature than at a high temperature,
A tap changer when loaded.   The on-load tap changer according to claim 8, further comprising stirring means for stirring the fluid in the container. A temperature detector for detecting an ambient temperature of the energy storage device part;
A temperature detector for detecting the ambient temperature of the shut-off mechanism,
A temperature difference determination unit that determines whether or not the temperature difference between the energy storage device ambient temperature and the shutoff mechanism ambient temperature is within a predetermined range; and
Control means for driving the stirring means in response to a command from the temperature difference determination unit when the temperature difference determination unit determines that the temperature difference is not within a predetermined range;
The load tap changer according to claim 9, further comprising: The interruption mechanism has a current limiting resistor,
A temperature detector for detecting an ambient temperature of the energy storage device part;
A temperature detector for detecting the ambient temperature of the shut-off mechanism,
The temperature rise time of the current limiting resistor is calculated based on the detection results of the ambient temperature of the energy storage device and the ambient temperature of the shut-off mechanism, and the presence / absence of abnormality of the shut-off mechanism is determined based on the transition of the temperature rise time An abnormality determination unit to perform,
The on-load tap changer according to any one of claims 8 to 10, characterized by comprising:

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