JP6308835B2 - Abnormality detection method for vacuum valve for switching switch of tap switching device under load - Google Patents

Description

  The present invention relates to a method for detecting the presence or absence of an abnormality in a vacuum valve provided in a switching switch of a load tap switching device.

  As shown in Patent Document 1, the on-load tap switching device includes a switching switch for switching the load current from one of the adjacent taps of the tap winding to the other in the tap switching process. FIG. 5 shows the configuration of one phase of this type of on-load tap changer. In the figure, Wm is a main winding of the transformer, Wt is a tap winding connected in series to the main winding, T1 is an odd number of taps t1, t3, t5,... Provided in the tap winding Wt. An odd tap selector T2 is an even tap selector that selects even taps t2, t4, t6,... Provided in the tap winding Wt.

  In FIG. 5, V1 is a first vacuum valve that opens and closes the load current flowing through the tap selectors T1 and T2 when the tap is switched. One end of the vacuum valve V1 is connected to the neutral point N of the transformer and the other end is The odd-numbered tap selector T1 and the even-numbered tap selector T2 are selectively connected via the changeover switch SW. R is a current limiting resistor that limits the circulating current that flows when the tap is switched, V2 is a second vacuum valve that switches on and off the current limiting resistor R, and one end of the second vacuum valve V2 is at a neutral point N. The other end is connected to the odd tap selector T1 through the current limiting resistor R. In this tap switching device, a switching switch is constituted by the first and second vacuum valves V1 and V2 and the selector switch SW.

  In the on-load tap changer shown in FIG. 5, when the odd tap is selected, the movable contact of the changeover switch SW is switched to the fixed contact S1 side connected to the odd tap selector T1 (the changeover switch SW is turned on). Switched to the odd tap selector T1 side), the vacuum valves V1 and V2 are closed as shown. When the even tap is selected, the movable contact of the changeover switch SW is switched to the fixed contact S2 side connected to the even tap selector T2 (the changeover switch SW is switched to the even tap selector T2 side). The vacuum valve V1 is closed and the vacuum valve V2 is opened.

  When the tap is switched from the odd tap to the even tap, for example, the selector switch SW is switched to the tap selector T1, the vacuum valves V1 and V2 are closed, and the tap t1 is selected. When switching to t2, first the vacuum valve V1 is opened and the load current is transferred to the current limiting resistor R. In this state, after the changeover switch SW is switched to the tap selector T2 side without arcing, the vacuum valve V1 is closed and the vacuum valve V2 is opened to complete the tap switching. When the changeover switch SW is switched to the tap selector T2 side and the vacuum valve V1 is closed, a circulating current flows between the taps t1 and t2, but this short-circuit current is limited by the current limiting resistor R.

  When the tap is switched from the even-numbered tap to the odd-numbered tap, for example, with the changeover switch SW switched to the tap selector T2 side, the vacuum valves V1 and V2 are closed and opened to select the tap t2. When the tap is switched from t2 to t3, first the tap t3 is selected by the tap selector T1, the vacuum valve V2 is closed, and the current limiting resistor R is connected to the tap t3 through the tap selector T1, The vacuum valve V1 is opened and the load current is transferred to the current limiting resistor R. Next, after the changeover switch SW is switched to the tap selector T1 side without arcing, the vacuum valve V1 is closed to complete the tap changeover.

 As described above, in the on-load tap changer, the taps are made by operating the vacuum valves V1 and V2 and the changeover switch SW constituting the changeover switch in a predetermined sequence in association with the operation of the tap selectors T1 and T2. Change over.

  FIG. 6 shows a sequence of operations of the vacuum valves V1 and V2 and the changeover switch SW when the on-load tap switching device shown in FIG. 5 switches the tap from the odd tap to the even tap, and the tap is changed from the even tap to the odd tap. A sequence of operations of the vacuum valves V1, V2 and the changeover switch SW at the time of switching is shown in FIG.

  6 and 7, the circuit configuration diagrams (A) to (F) shown in the lower stage are circuit configuration diagrams showing the states of the vacuum valves V1, V2 and the changeover switch SW in the order of operation. In the figure, the circuit through which the load current flows is indicated by a thick line. In FIG. 6 and FIG. 7, the four bar graphs shown in the upper part of the circuit configuration diagram sequentially showing the operations of the vacuum valves V1, V2 and the changeover switch SW are the sequence of the operations of the vacuum valves V1 and V2 and the changeover switch SW. Is shown over time. Of these graphs, the two graphs labeled V1 and V2 at the left end show the operation sequences of the vacuum valves V1 and V2, respectively. In these graphs, the vacuum is applied during the hatched period. Valves V1 and V2 are turned on.

  6 and 7, the bar graphs with S1 and S2 displayed on the left end indicate the sequence of the operation of the changeover switch SW, and the period in which the diagonal lines are applied in the graph with S1 displayed on the left end. During this period, the movable contact of the changeover switch SW is switched to the fixed contact S1 side, and the movable contact of the changeover switch SW is switched to the fixed contact S2 side during the period shaded in the graph with S2 displayed on the left end. It is shown that. Detailed description of the operation sequence of FIGS. 6 and 7 is omitted.

  In this type of on-load tap switching device, a vacuum valve operating mechanism is provided to operate the first and second vacuum valves V1 and V2. As shown in Patent Document 1, this operation mechanism is driven by a rotation drive device having an accumulation spring accumulated by a motor, and is rotated by a rotation drive device in one direction and the other direction. A drive shaft and a cam mechanism driven by the drive shaft are included. The cam mechanism includes a drive cam attached to the drive shaft, first and second cam followers provided for the first and second vacuum valves and abutting against the cam surface of the drive cam, and the drive cam And a displacement transmission mechanism for transmitting displacements of the first and second cam followers generated by the rotation of the first and second cam followers to the movable electrode rods of the first and second vacuum valves, respectively. By transmitting the displacement of the first and second cam followers to the movable electrode rods of the first and second vacuum valves, respectively, the first and second vacuum valves are turned on and off. The change-over switch SW that constitutes the change-over switch together with the first and second vacuum valves is operated by the drive shaft and performs a change-over operation when the rotational angle position of the drive shaft reaches a predetermined position.

  In this type of drive mechanism, when the tap is switched from odd-numbered taps to even-numbered taps, the drive shaft is rotated by a predetermined rotation angle (for example, approximately 90 °) in one direction, and the taps are switched from even-numbered taps to odd-numbered taps. Then, the drive shaft is rotated by a predetermined rotation angle (for example, approximately 90 °) in the other direction. While the drive shaft rotates by a predetermined angle in one direction, the ON / OFF operation of the vacuum valves V1 and V2 and the switching operation of the changeover switch SW when the tap is switched from the odd tap to the even tap are performed in a predetermined sequence. While the shaft rotates by a predetermined angle in the other direction, the ON / OFF operation of the vacuum valves V1 and V2 and the switching operation of the changeover switch SW when the tap is switched from the even tap to the odd tap are performed in a predetermined sequence.

  In order to maintain the current interruption performance of the vacuum valve, it is necessary to maintain the degree of vacuum in the vacuum vessel within a predetermined range. However, it is inevitable that the degree of vacuum of the vacuum container decreases with the deterioration of the vacuum valve. If the vacuum degree of the vacuum vessel exceeds the allowable limit, satisfactory current interruption performance cannot be obtained. Therefore, it is necessary to replace the vacuum valve when the deterioration thereof has progressed to some extent.

  When the deterioration of the vacuum valve is aged, the replacement time can be predicted. Therefore, the time to replace the vacuum valve can be easily managed, but the deterioration of the vacuum valve is not limited to aging. For some reason, the deterioration of a specific vacuum valve progresses rapidly, and the load current may not be cut off normally. Therefore, in order to properly perform the maintenance of the on-load tap switching device using the vacuum valve as the switch means of the switching switch, it is necessary to check whether or not the vacuum valve is abnormal. is there.

  As a method of checking the presence or absence of abnormality of the vacuum valve, it can be considered to periodically inspect each vacuum valve, but in order to inspect each vacuum valve, the operation of the on-load tap switching device is stopped, Not only does the main body need to be taken out of the case and disassembled, but also measures to avoid power outages need to be taken. Therefore, as shown in Patent Document 2, the operation speed when the vacuum valve performs the on operation or the off operation is detected from the output of the rotation sensor attached to the drive shaft of the cam mechanism that drives the vacuum valve, A method for inspecting the presence or absence of abnormality of the vacuum valve by comparing the detected value with a reference value has been proposed.

  In the vacuum valve, a force that urges the movable electrode toward the fixed electrode side is constantly acting due to the pressure difference between the inside and outside of the vacuum vessel, and this force affects the operating speed of the vacuum valve. When the vacuum valve is turned on, the force acting on the movable electrode due to the pressure difference between the inside and outside of the vacuum vessel works to help the displacement of the movable electrode toward the fixed electrode. When the degree of vacuum in the container is reduced (when the pressure difference between the inside and outside of the vacuum container is reduced), the operation speed when the vacuum valve is turned on becomes slow. On the other hand, when the vacuum valve is turned off, the force acting on the movable electrode due to the pressure difference between the inside and outside of the vacuum vessel acts to prevent the displacement of the movable electrode away from the fixed electrode. When the degree of vacuum inside decreases and the pressure difference between the inside and outside of the vacuum vessel decreases, the operating speed when the vacuum valve performs the off operation increases. Therefore, as shown in Patent Document 2, if the operation speed when the vacuum valve is turned on or off is detected and the detected value is compared with the reference value, the abnormality of the vacuum valve is detected. The presence or absence can be detected.

  Further, as shown in Patent Document 3, a direct current is passed through the internal circuit of the on-load tap switching device to observe the waveform of the direct current when the tap switching operation is performed. It has also been proposed to determine the presence or absence.

JP 2004-319975 A JP 2008-91393 A JP 2000-208340 A

  As disclosed in Patent Document 2, the vacuum valve operating speed is detected from the rotation angle of the drive shaft of the cam mechanism that operates the vacuum valve, and the detected value is compared with a reference value, whereby the abnormality of the vacuum valve is detected. By detecting the presence or absence of the vacuum valve, it is possible to detect the presence or absence of abnormality of the vacuum valve without stopping the operation of the on-load tap switching device. However, in the method disclosed in Patent Document 2, the detection accuracy varies depending on how the reference value to be compared with the detected operation speed of the vacuum valve is set, so it is difficult to improve the reliability of abnormality detection. .

  Further, as shown in Patent Document 3, when a direct current is passed through the internal circuit of the on-load tap switching device and the method of observing the waveform of the direct current when the tap switching operation is performed, When inspecting the vacuum valve, it is not necessary to take out the main body of the on-load tap changer from the case, but it is necessary to stop the operation when direct current is passed through the internal circuit of the on-load tap changer. It is necessary to take measures to avoid the power outage, which is not preferable.

  The object of the present invention is to detect the presence or absence of abnormality of the vacuum valve constituting the switching switch of the on-load tap switching device without stopping the operation of the on-load tap switching device, and the accuracy of the detected parameters and settings. An object of the present invention is to propose a method for detecting an abnormality in a vacuum switch for a switching switch of a load tap switching device that can be performed with high accuracy without comparison with a reference value.

  The present invention provides a three-phase first vacuum valve that opens and closes a load current that flows through a tap selector at the time of tap switching, and a three-phase first that switches on and off a current limiting resistor that limits the circulating current that flows at the time of tap switching. A switching switch having two vacuum valves, and the tap selector is driven to rotate in one direction when switching from the state in which the tap selector selects the odd-numbered tap to the state in which the even-numbered tap is selected. A drive shaft that is rotationally driven in the other direction when switching from the selected state to a state that selects odd taps, a drive cam that is rotated together with the drive shaft, and the three-phase first and second vacuum valves Each of the cam followers provided in contact with the cam surface of the drive cam, and the cam follower being displaced in the process of rotating the drive shaft in each direction. By transmitting to the operation shaft of the corresponding vacuum valve, the abnormality of the vacuum valve of the on-load tap switching device that causes the three-phase first vacuum valve and the second vacuum valve to open and close in a predetermined sequence The present invention relates to a method for detecting presence or absence.

  In one aspect of the present invention, a rotary encoder that detects a rotation angle of a drive shaft is attached to the drive shaft, and the rotation angle of the drive shaft detected by the rotary encoder when the drive shaft rotates in one direction or the other direction. And the elapsed time when the drive shaft rotates in one direction or the other direction, and information on the rotational speed of the drive shaft from the start of the three-phase first vacuum valve to the end thereof. The first parameter and the second parameter including information on the rotational speed of the drive shaft from the start to the end of the three-phase second vacuum valve are detected and compared. From the result of comparing the first parameter and the second parameter, the rotational speed of the drive shaft and the three-phase first time from the start of the three-phase first vacuum valve to the end thereof are determined. 2 vacuum valve is on Of the three-phase first vacuum valve and second vacuum valve, when it is determined that there is a difference equal to or greater than a threshold value between the rotational speed of the drive shaft from the start to the end, It is detected that there is an abnormality in any of the three-phase vacuum valves whose drive shaft rotation speed is slower from the start to the end of the ON operation.

  If there is no abnormality in the three-phase first vacuum valve and the second vacuum valve, and the first vacuum valve and the second vacuum valve are deteriorated only over time, the three-phase first vacuum valve The rotation speed (average rotation speed) of the drive shaft from the start of the ON operation to the end of the ON operation, and the ON operation after the three-phase second vacuum valve starts the ON operation There is almost no difference between the rotational speed (average rotational speed) of the drive shaft until the end, and even if there is a difference. On the other hand, if one of the three-phase first vacuum valve and the second vacuum valve includes a vacuum valve whose deterioration has progressed and the degree of vacuum is abnormally reduced, Of the 1 vacuum valve and the 2nd vacuum valve, the one that contains the abnormal vacuum valve slows down the rotational speed of the drive shaft when performing the on operation, and the three-phase first vacuum valve is turned on. The rotation speed (average rotation speed) of the drive shaft from the start to the end of the ON operation, and from the start of the ON operation of the three-phase second vacuum valve to the end of the ON operation There is a significant difference between the rotational speed of the drive shaft (average rotational speed).

  Therefore, as described above, the rotational speed of the drive shaft from the start of the first vacuum valve to the end of the on operation and the second vacuum valve from the start of the on operation. When it is determined that there is a difference equal to or greater than the threshold value with respect to the rotational speed of the drive shaft until the on-operation is completed, of the three-phase first vacuum valve and second vacuum valve, If an abnormality is detected in any of the three-phase vacuum valves whose drive shaft rotation speed has been slow from the start to the end of the operation, is the vacuum valve abnormal? It is possible to accurately determine whether or not.

  The first parameter is a known rotation angle of the drive shaft while the drive shaft rotates from a position at which the first vacuum valve starts to be turned on to a position at which the first vacuum valve is turned on, and the drive shaft turns on the first vacuum valve. The angular velocity of the drive shaft obtained by dividing by the time required to rotate from the start position to the end position can be obtained as the second parameter, and the second parameter is that the drive shaft is connected to the second vacuum valve. It took a known rotation angle of the drive shaft during the rotation from the position where the on-operation is started to the position where it is finished to rotate from the position where the drive shaft starts the on-operation of the second vacuum valve to the position where it is finished. The angular velocity of the drive shaft obtained by dividing by time can be obtained.

  The first parameter may be a time required for the drive shaft to rotate from a position at which the first vacuum valve starts to be turned on to a position at which the first vacuum valve is turned on. The time required to rotate from the position where the ON operation of the second vacuum valve is started to the position where it is ended can be set.

  In another aspect of the present invention, a rotary encoder that detects the rotation angle of the drive shaft is attached to the drive shaft, and the drive shaft rotation angle and drive detected by the encoder when the drive shaft rotates in one direction or the other direction. First information including information on the rotational speed of the drive shaft from the elapsed time when the shaft rotates in one direction or the other direction to the end of the three-phase first vacuum valve from the start to the end. And the second parameter including information on the rotational speed of the drive shaft from the start of the three-phase second vacuum valve to the end thereof is compared, and the two parameters are compared. As a result of comparing the first parameter and the second parameter, the rotational speed of the drive shaft from the start of the first vacuum valve to the end thereof and the second vacuum valve are turned off. From start to finish When it is determined that there is a difference between the rotation speed of the drive shaft and a threshold value or more, of the three-phase first vacuum valve and the second vacuum valve, the off operation is started and the operation is ended. It is detected that there is an abnormality in any of the three-phase vacuum valves whose rotational speed of the drive shaft until this time is high.

  If there is no abnormality in the three-phase first vacuum valve and the second vacuum valve, and the first vacuum valve and the second vacuum valve are deteriorated only over time, the three-phase first vacuum valve The rotation speed (average rotation speed) of the drive shaft from the start of the OFF operation to the end of the OFF operation, and the OFF operation after the three-phase second vacuum valve starts the OFF operation There is almost no difference between the rotational speed (average rotational speed) of the drive shaft until the end, and even if there is a difference. On the other hand, when one of the three-phase first vacuum valve and the second vacuum valve includes an abnormal vacuum valve that has deteriorated, the three-phase first vacuum valve and the second vacuum valve Among the two vacuum valves, the one with an abnormal vacuum valve increases the rotational speed of the drive shaft when performing the off operation, and the three-phase first vacuum valve starts the off operation. The rotation speed (average rotation speed) of the drive shaft until the end of the off operation and the drive shaft from the start of the on operation of the three-phase second vacuum valve to the end of the on operation. There is a significant difference between the rotational speed (average rotational speed).

  Therefore, as described above, the rotational speed of the drive shaft from the start of the first vacuum valve to the end of the off operation and the second vacuum valve from the start of the off operation Of the three-phase first vacuum valve and the second vacuum valve, when it is determined that there is a difference equal to or greater than a threshold value with respect to the rotational speed of the drive shaft until the end of the off operation, Whether or not an abnormality has occurred in the vacuum valve by detecting that there is an abnormality in any of the three-phase vacuum valves whose drive shaft rotation speed has increased between the start and end of operation Such a determination can be made accurately.

  The first parameter is the rotation angle of the drive shaft while the drive shaft rotates from the position at which the first vacuum valve starts to be turned off to the position at which the first vacuum valve is turned off. The angular velocity (rotational speed) of the drive shaft determined by dividing by the time required to rotate from the start position to the end position can be obtained, and the second parameter is the second vacuum valve for the drive shaft. The rotation angle of the drive shaft during the rotation from the start position to the end position is the time required for the drive shaft to rotate from the start position to the end position of the second vacuum valve. The angular velocity (rotational speed) of the drive shaft obtained by dividing can be obtained.

  Further, the first parameter can be a time required for the drive shaft to rotate from a position at which the first vacuum valve starts to be turned off to a position at which the drive shaft is finished. The time required for the rotation from the position where the off operation of the second vacuum valve is started to the position where the second vacuum valve is ended can be set.

  According to the present invention, the three-phase first vacuum valve starts the on operation (or the off operation) from the output of the rotary encoder attached to the drive shaft that drives the first and second vacuum valves and the elapsed time. The first parameter including information on the rotational speed of the drive shaft from the start to the end, and the time from when the three-phase second vacuum valve starts the ON operation (or OFF operation) to the end By detecting the second parameter including the information on the rotational speed of the drive shaft and comparing these parameters, the first vacuum valve starts from the ON operation (or OFF operation) until it ends. It is determined that there is a difference greater than or equal to a threshold value between the rotational speed of the drive shaft between the rotational speed of the drive shaft and the rotational speed of the drive shaft between the start and end of the second vacuum valve. When the three-phase first Of the empty valve and the second vacuum valve, the rotation speed of the drive shaft that is slower from the start of the on operation (or off operation) to the end of the on operation (or off operation) (or Since it is detected that there is an abnormality in any of the three-phase vacuum valves (whichever is faster), the accuracy of setting the operating speed of each of the first vacuum valve and the second vacuum valve is questioned. It is possible to accurately determine whether or not an abnormality has occurred in the vacuum valve without performing the process of comparing with the reference value.

  In addition, since the detection of the first parameter and the detection of the second parameter can be performed at any time without stopping the operation of the on-load tap switching device, the on-load tap switching device can be disassembled or the on-load tap switching can be performed. Without stopping the operation of the device, it is possible to constantly monitor the presence or absence of vacuum valve abnormalities, and cope with the sudden occurrence of some vacuum valve abnormalities during operation of the on-load tap changer. be able to.

In one Embodiment of this invention, it is the longitudinal cross-sectional view which showed the state which attached the rotary encoder to the drive shaft of the switching switch of the tap switching apparatus at the time of load. (A) thru | or (D), respectively, the operation | movement which showed the operation state in the 1st thru | or 4th process of the operation sequence of the cam mechanism which drives the 1st vacuum valve and 2nd vacuum valve of a switching switch in order of operation It is explanatory drawing. (A) to (D) are operations showing the operation states in the fifth to eighth steps of the operation sequence of the cam mechanism for driving the first vacuum valve and the second vacuum valve of the switching switch in the order of operations. It is explanatory drawing. A) to (D) are operational explanations showing the operational states in the ninth to twelfth steps of the operational sequence of the cam mechanism for driving the first vacuum valve and the second vacuum valve of the switching switch, respectively. FIG. It is the circuit diagram which showed an example of the electrical constitution for one phase of the tap change switch at the time of loading which this invention makes object. FIG. 6 is an operation explanatory diagram showing an operation when the tap is switched from an odd-numbered tap to an even-numbered tap in the on-load tap switching switch shown in FIG. 5. FIG. 6 is an operation explanatory diagram showing an operation when the tap is switched from the even-numbered tap to the odd-numbered tap in the on-load tap change-over switch shown in FIG. 5.

  FIG. 1 shows a main part of a load tap switching device. In FIG. 1, 1 is a case of a switching switch room, and 2 is a frame disposed in the case 1 and fixed to the case. 200, a switching opening and closing device constituted by supporting a first and second vacuum valves constituting a switching switch, a changeover switch, and a cam mechanism 201 for driving the first and second vacuum valves. A drive shaft that is rotatably supported by the frame 200 and drives a cam mechanism and a changeover switch of the changeover opening / closing device. Reference numeral 5 denotes a rotary drive device that is disposed in the lower part of the case 1 and drives the drive shaft 4 to rotate in one direction and the other direction by a fixed angle using a spring as a drive source. 6 stores the spring of the rotary drive device 5 For this purpose, the power transmission mechanism transmits power generated by a motor (not shown) to the input shaft 501 of the rotary drive device 5.

  The illustrated power transmission mechanism 6 includes a speed reducer 600 that decelerates rotation of a motor (not illustrated), an insulating shaft 602 having one end connected to the output shaft of the speed reducer 600 via a universal joint 601, and the other end of the insulating shaft 602. A gear 605 attached to a rotary shaft 604 connected to the rotary shaft 604 through a universal joint 603 and a gear 606 attached to the input shaft 501 of the rotary drive device 5 and meshed with the gear 605. A current limiting resistor R is accommodated in the case 1 so as to be positioned above the switching opening and closing device 2.

  As shown in FIG. 5, the switching opening / closing device 2 includes a three-phase first vacuum valve V <b> 1 that opens and closes a load current that flows through a tap selector when a tap is switched, and a current limiting that limits a circulating current that flows when the tap is switched. A three-phase second vacuum valve V2 that switches on and off the resistor R, and a switch that switches between a state in which the first vacuum valve V1 is connected to the odd tap selector T1 and a state in which the resistor R is connected to the even tap selector T2. And a phase changeover switch SW. FIG. 1 shows only the U-phase first vacuum valve V1u and the U-phase change-over switch SW 2 among the vacuum valves and change-over switches provided in the change-over switch 2. Actually, U, V and W three-phase first vacuum valves V1u to V1w are arranged around the drive shaft 4 at intervals of 120 °, and a three-phase second vacuum is disposed on the side of these vacuum valves. Valves V2u to V2w are arranged at intervals of 120 °. A U, V, W three-phase selector switch SW is arranged around the drive shaft 4.

  Each vacuum valve has a vacuum vessel 210 in which the inside is maintained in a vacuum state, a fixed electrode and a movable electrode (not shown) accommodated in the vacuum vessel 210, and a tip slidably supported by the vacuum vessel 210. Are connected to the movable electrode, a bellows 212 provided between the vacuum vessel 210 and the movable electrode rod 211 to maintain the degree of vacuum in the vacuum vessel 210, and the movable electrode and the fixed electrode. A pressure spring 213 that urges the movable electrode rod 211 to obtain a contact pressure, and the movable electrode is in contact with the fixed electrode when no operating force is applied to the movable electrode rod 211 (ON state) ), And when the movable electrode bar 211 is operated in a direction to pull out from the vacuum vessel 210 against the urging force of the pressure spring 213, the movable electrode is separated from the fixed electrode and is turned off.

  The cam mechanism 201 for driving the vacuum valve is provided in common with the three-phase first and second vacuum valves and attached to the drive shaft 4, and the three-phase first vacuum valve V1u. ˜V1w, respectively, and L-shaped drive levers 202u to 202w (202v in FIG. 1) which are rotatable and have intermediate portions (corner portions) supported by pins 200 on the frame 200 of the switching opening / closing device. And 202w (not shown), and cam followers 21u to 21w (21v and 21w not shown in FIG. 1) rotatably supported at one ends of these drive levers. The other ends of the L-shaped drive levers 202u to 202w are pivotally coupled to the movable electrode rod 211 of the first vacuum valves V1u to V1w (V1v and V1w are not shown in FIG. 1). Although not shown in FIG. 1, the cam mechanism 201 is also provided corresponding to each of the three-phase second vacuum valves V2u to V2w, and is supported by the frame 200 so as to be rotatable. And a cam follower rotatably supported at one end of these drive levers, and the other end of these drive levers is pivotally connected to the movable electrode rod of the second vacuum valve.

  On the outer periphery of the drive cam 20, there are formed three convex portions arranged at intervals of 120 ° and a cam surface formed of a cylindrical surface provided so as to connect between the convex portions, and each cam follower is provided on this cam surface. It is in contact. In the process in which the drive cam 20 is driven to rotate, the convex portion of the cam surface pushes the cam follower provided for each vacuum valve to rotate the L-shaped drive lever, thereby turning off each vacuum valve.

  The drive shaft 4 that drives the drive cam 20 is moved from the set first position to the second position by a spring provided in the rotary drive device 5 when the tap is switched from the odd tap to the even tap. The three-phase first and second vacuum valves are turned on and off in a predetermined sequence. The drive shaft 4 is also rotated at a stroke from the set second position to the first position by a spring provided in the rotation drive device 5 when the tap is switched from the even tap to the odd tap. During this time, the three-phase first and second vacuum valves are turned on and off in a predetermined sequence.

  The drive shaft 4 is restrained to the rotation start position (the first position or the second position) until the spring of the rotary drive device 5 is accumulated by the power applied from the motor (not shown) through the power transmission device 6. In order to prevent rotation of the drive shaft 4, a stopper mechanism 3 is provided. The illustrated stopper mechanism 3 includes an auxiliary cam 31 that is fixed to the drive cam 20, an L-shaped lever 32 that is rotatably supported with respect to the frame 200, and an auxiliary cam 31 that is attached to one end of the L-shaped lever 32. The auxiliary cam follower 33 is in contact with the cam surface, and a spring 34 that biases the L-shaped lever 32 on the side that presses the auxiliary cam follower 33 against the cam surface of the auxiliary cam 31. The auxiliary cam 31 is made of a plate-like member having a cam surface on the side surface, and is fixed on the drive cam 20 with the cam surface facing the same side as the cam surface of the drive cam 20. The cam surface of the auxiliary cam 31 includes a first protrusion formed by a mountain shape that engages with the auxiliary cam follower 33 to prevent the drive shaft 4 from rotating to the second position side when the drive shaft 4 is in the first position. A first stopper portion and a second stopper made of a mountain-shaped protrusion that engages with the auxiliary cam follower 33 to prevent the drive shaft 4 from rotating to the first position side when the drive shaft 4 is in the second position. Are provided.

  The phase changeover switch SW is supported by the movable contact 210 fixed to the drive shaft 4 and the frame 200 with a space in the rotational direction of the drive shaft 4 so that the movable contact 210 selectively contacts. Odd-numbered tap-side fixed contact S1 and even-numbered tap-side fixed contact S2 (only the odd-numbered tap-side fixed contact S1 is shown in FIG. 1). Although not shown, three-phase selector switches SW are arranged around the drive shaft 4 at 120 ° intervals.

  In this embodiment, the lower end of the insulating shaft 702 is coupled to the upper end of the drive shaft 4 via an Oldham coupling 701, and the upper end of the insulating shaft 702 is a bearing attached to the cover plate 100 that closes the opening at the upper end of the case 1. 703 is rotatably supported. A rotary shaft of an absolute rotary encoder RE is coupled to an upper end of an insulating shaft 702 led upward through the shaft house 703. A cover 705 that covers the rotary encoder RE is attached to the cover plate 100.

  In order to facilitate the understanding of the operation of the switching opening and closing device, the configuration of the main part of the operation mechanism unit comprising the cam mechanism 201, the first and second vacuum valves V1u to V1w and V2u to V2w, and the stopper mechanism 3. The operation will be described with reference to the operation explanatory diagrams of FIGS.

  2 to 4, the drive cam 20 is made of a plate-like member whose plate surface is orthogonal to the drive shaft 4, and the drive shaft 4 is fitted into a hole provided in the shaft core portion to make a key. It is fixed to the drive shaft 4 in a stopped state. On the outer periphery of the drive cam 20, a cam surface 20a comprising three convex portions 20u to 20w arranged at intervals of 120 ° and a cylindrical surface provided so as to connect these convex portions 20u, 20v and 20w. Is formed.

  Around the drive cam 20, U-phase or W-phase first vacuum valves V1u to V13 are arranged side by side at intervals of 120 °, and a U-phase or W-phase second vacuum valve is disposed on the side of the first vacuum valve. The vacuum valves V2u to V2w are also arranged side by side at intervals of 120 °.

  2 to 4, reference numerals 21u to 21w denote cam followers provided for the three-phase first vacuum valves V1u to V1w and arranged around the drive cam 20 at intervals of 120 °, respectively. Is a cam follower which is provided for the three-phase second vacuum valves V2u to V2w and is arranged on the side of the cam followers 21u to 21w side by side at intervals of 120 °. These cam followers are pressed against the cam surface 20a of the drive cam 20 by a pressure spring that urges the movable electrode rod of the corresponding vacuum valve toward the fixed electrode. The cam followers 21u to 21w and 22u to 22w are displaced to the side away from the drive shaft 4 in the process of riding on the convex portions 20u to 20w of the drive cam 20, and descend from the convex portions 20u to 20w of the drive cam 20. In the process, it is displaced toward the drive shaft.

  The cam followers 21u to 21w and 22u to 22w are connected to the movable electrode rods 211 (see FIG. 1) of the corresponding vacuum valves V1u to V1w and V2u to V2w via a displacement transmission mechanism constituted by L-shaped levers. The operation of turning the corresponding vacuum valve from the on state to the off state in the process in which the cam followers 21u to 21w and 22u to 22w ride on the convex portions 20u to 20w of the drive cam 20 and move away from the drive shaft 4, respectively (off In the process in which the cam followers 21u to 21w and 22u to 22w descend from the convex portions 20u to 20w of the drive cam 20, the corresponding vacuum valve is turned on from the off state (on operation). Is called.

  In order to configure a stopper mechanism that stops the drive shaft until the accumulation of the energy accumulation mechanism provided in the rotary drive device 5 that drives the drive shaft 4 is completed, as described above, Auxiliary cam 31 is fixed to. The auxiliary cam 31 is made of a plate-like member having a cam surface 31 a having a substantially cylindrical surface on the side surface, and the drive cam 20 with the cam surface 31 a facing the same side as the cam surface 20 a of the drive cam 20. And is fixed to the drive cam 20 by a bolt 32. The cam surface 31a of the auxiliary cam 31 is as shown in FIG. 2B when the drive shaft 4 is rotated by a certain angle in one direction (clockwise) from the initial position when the drive shaft 4 switches the tap from the odd tap to the even tap. In addition, the first stopper portion 31a1 that engages with the auxiliary cam follower 33 to prevent the rotation of the drive shaft 4 in one direction and the other direction from the initial position when the drive shaft 4 switches the tap from the even-numbered tap to the odd-numbered tap ( It has a second stopper portion 31a2 that engages with the auxiliary cam follower 33 to prevent the drive shaft 4 from rotating in the other direction when rotated by a certain angle in the counterclockwise direction. The stopper portions 31a1 and 31a2 are formed by chevron-shaped projections, and the drive shaft 4 is restrained until the auxiliary cam follower 33 gets over these stopper portions by the force applied from the accumulator spring through the drive shaft 4 and the drive cam 20. To prevent its rotation.

  When the tap is switched from the odd tap to the even tap, the drive shaft 4 is rotated clockwise from the initial position (θ = 0) shown in FIG. In the state shown in FIG. 2A, the cam followers corresponding to the first vacuum valves V1u to V1w and the second vacuum valves V2u to V23 are separated from the convex portion of the drive cam. Both are on. The movable contact of the changeover switch SW is switched to the fixed contact S1 side (odd tap side). The state in which the movable contact of the changeover switch SW is switched to the fixed contact S1 side will be referred to as S1 being on.

  When the drive shaft 4 rotates clockwise by a predetermined angle from the initial position to reach the state shown in FIG. 2B (θ = θ1), the auxiliary cam follower 33 hits the stopper portion 31a1 of the auxiliary cam 31, and the drive shaft 4 rotates. Be blocked. While the rotation of the drive shaft is blocked, the accumulator is charged by the motor. When the accumulation of the accumulation mechanism is completed, the auxiliary cam follower 33 is separated from the stopper portion 31a1, and the drive shaft is rotated in a clockwise direction at once. In the course of this rotation, when the drive shaft 4 rotates to the position (θ = θ2) shown in FIG. 2C, the convex portions 20u to 20w of the drive cam 20 displace the cam followers 21u to 21w, and the first When the off operation of the vacuum valves V1u to V1w is started and the drive shaft 4 rotates to the position (θ = θ3) shown in FIG. 2D, the off operation of the first vacuum valves V1u to V1w is completed. At this time, the second vacuum valves V2u to V2w remain in the ON state, and the changeover switch SW remains switched to the fixed contact S1 side (S1 remains in the ON state).

  When the drive shaft 4 further rotates and reaches the position (θ = θ4) shown in FIG. 3A, the movable contact of the changeover switch SW is separated from the fixed contact S1, and the changeover switch SW is turned off (the movable contact is A state in which neither of the fixed contacts S1 and S2 is in contact). At this time, the first vacuum valves V1u to V1w remain off and the second vacuum valves V2u to V2w remain on.

  When the drive shaft 4 further rotates and reaches the position (θ = θ5) shown in FIG. 3B, the movable contact of the changeover switch SW comes into contact with the fixed contact S2. At this time, the first vacuum valves V1u to V1w remain off and the second vacuum valves V2u to V2w remain on.

  When the drive shaft 4 further rotates and reaches the position (θ = θ6) in FIG. 3C, the convex portions 20u to 20w of the drive cam 20 start contact with the cam followers 21u to 20w, and therefore the first vacuum. The on operation of the valves V1u to V1w is started. At this time, the second vacuum valves V2u to V2w remain in the on state, and the changeover switch SW remains switched to the fixed contact S2 side (even-numbered tap side) (still in the S2 on state).

  When the drive shaft 4 further rotates and reaches the position (θ = θ7) in FIG. 3D, the ON operation of the first vacuum valves V1u to V1w is completed. At this time, the second vacuum valves V2u to V2w remain on, and the changeover switch SW remains switched to the fixed contact S2 side.

  When the drive shaft 4 further rotates and reaches the position (θ = θ8) in FIG. 4A, the convex portions 20u to 20w of the drive cam 20 start contact with the cam followers 22u to 22w, so that the second vacuum The valves V2u to V2w are turned off. At this time, the first vacuum valves V1u to V1w remain in the ON state, and the changeover switch SW remains switched to the fixed contact S2 side (even-numbered tap side) (S2 remains in the ON state).

  When the drive shaft 4 further rotates and reaches the position (θ = θ9) in FIG. 4B, the off operation of the second vacuum valves V2u to V2w is completed. At this time, the first vacuum valves V1u to V1w remain on, and the changeover switch SW remains switched to the fixed contact S2 side (even-numbered tap side).

  When the drive shaft 4 further rotates and reaches the position (θ = θ10) of FIG. 4C, the auxiliary cam follower 33 hits the second stopper portion 31a2 of the auxiliary cam. When the auxiliary cam follower 33 gets over the second stopper portion 31a2 of the auxiliary cam and the drive cam 20 further rotates and reaches the final position (θ = θ11) in FIG. 4D, the switching operation from the odd tap to the even tap is performed. Ends.

  When switching the tap from the even-numbered tap to the odd-numbered tap, the drive shaft is rotated counterclockwise from the state shown in FIG. When the drive shaft is rotated counterclockwise, the auxiliary cam follower 33 hits the stopper portion 31a2 when the rotational angle position of the drive shaft reaches the position θ = θ10 (the position shown in FIG. 4C), and the energy storage spring Accumulated. Next, the ON operation of the second vacuum valves V2u to V2w is started at the position of θ = θ9 (position of FIG. 4B) while the drive shaft 4 rotates counterclockwise at once, and the position of θ = θ8 (FIG. 4A). At the position), the ON operation of the second vacuum valves V2u to V2w is completed. The first vacuum valves V1u to V1w are turned off at the position θ = θ7 (position shown in FIG. 3D), and the first vacuum valves V1u to V1w are turned off at the position θ = θ6 (position shown in FIG. 3C). The operation is complete. The first vacuum valves V1u to V1w are turned on at the position θ = θ3 (position in FIG. 2D), and the first vacuum valves V1u to V1w are turned on at θ = θ2 (position in FIG. 2C). The operation ends.

  The abnormality detection method according to the present invention includes a first on-load vacuum valve V1u to V1w that constitutes a switching switch in the on-load tap switching device including the switching switch operated by the cam mechanism having the above-described configuration. Stop operation of the on-load tap changer to determine if any of the second vacuum valves V2u to V2w has an abnormality that requires immediate replacement or repair (abnormal deterioration different from aging deterioration). It is a method of detecting without letting.

  The vacuum valve constituting the switching switch of the tap switching device at the time of loading has a structure in which a main circuit switching part composed of a fixed electrode and a movable electrode is accommodated in a vacuum container (valve) in which the inside is kept in a vacuum, Between the movable electrode and the fixed electrode of the vacuum valve, a force in a direction for urging the movable electrode toward the fixed electrode is constantly acting due to a pressure difference between the inside and outside of the vacuum vessel. This force acts to prevent displacement of the movable electrode toward the open position when the vacuum valve is turned off, and when the vacuum valve is turned on, the force is placed at the closed position of the movable electrode. It works to help the displacement towards. As the degree of vacuum in the vacuum vessel decreases, the force for biasing the movable electrode toward the fixed electrode side becomes weak due to the pressure difference between the inside and outside of the vacuum vessel. In general, since the operating force generated by the operating mechanism for operating the vacuum valve is constant, the deterioration of the vacuum valve progresses, and the force for biasing the movable electrode toward the fixed electrode side becomes weak due to the pressure difference between the inside and outside of the vacuum vessel. As you go, the speed of movement changes. That is, when the vacuum valve is further deteriorated and the vacuum degree of the vacuum container is lowered, the operation speed when the vacuum valve is turned on is reduced, and the speed at which the vacuum valve is turned off is increased.

  In the detection method of the present invention, when the absolute rotary encoder RE that detects the rotation angle of the drive shaft 4 is attached to the drive shaft 4 via the insulating shaft 702, the drive shaft 4 rotates in one direction or the other direction. The three-phase first vacuum valves V1u to V1w are turned on (or turned off) from the rotation angle of the drive shaft detected by the rotary encoder RE and the elapsed time when the drive shaft rotates in one direction or the other direction. The first parameter including information on the rotational speed of the drive shaft 4 from the start to the end of the on-operation (or off-operation) and the three-phase second vacuum valves V2u to V2w are on. A second parameter including information on the rotational speed of the drive shaft from the start of the operation (or off operation) to the end of the on operation (or off operation) is detected and compared. Next, based on the result of comparing the first parameter and the second parameter, the driving from the start of the three-phase first vacuum valves V1u to V1w to the end thereof is started (or turned off). There is a difference of more than a threshold value between the rotational speed of the shaft and the rotational speed of the drive shaft from the start to the end of the three-phase second vacuum valves V2u to V2w. When it is determined that there is, the rotational speed of the drive shaft 4 from the start to the end of the three-phase first vacuum valve and the second vacuum valve until the end of the on operation (or off operation) is Detect that there is an abnormality in any of the slower (or faster) three-phase vacuum valves.

  As the first parameter, the rotation angle of the drive shaft (known angle) while the drive shaft 4 rotates from the position at which the first vacuum valves V1u to V1w start the on operation (or the off operation) to the position at which it ends. ) The average of the drive shafts 4 obtained by dividing α by the time Δt required for the drive shaft 4 to rotate from the position at which the first vacuum valve starts the on operation (or the off operation) to the position at which it ends. Angular velocity (α / Δt) may be used, and the drive shaft 4 rotates a section of a constant angle α from a position where the first vacuum valves V1u to V1w start to turn on (or turn off) to a position where they end. The time Δt required to do this may be used.

  Similarly, as the second parameter, the rotation angle of the drive shaft 4 during the rotation of the drive shaft 4 from the position at which the second vacuum valves V2u to V2w start to turn on (or off) from the position to the end. The (known angle) α ′ is divided by the time Δt ′ required for the drive shaft 4 to rotate from the position where the second vacuum valves V2u to V2w start (or turn off) to the position where they end. The average angular velocity (α ′ / Δt ′) of the drive shaft 4 obtained by this may be used, and the drive shaft 4 is terminated from the position where the second vacuum valves V2u to V2w start the on operation (or the off operation). The time Δt ′ required to rotate the section having a constant angle α ′ to the position may be used.

  For example, in the process in which the drive shaft 4 rotates in one direction, the three-phase first vacuum valves V1u to V1w start the off operation at the position θ = θ2, and then the off operation is completed at the position θ = θ3. The average angular velocity of the drive shaft during the period until the three-phase second vacuum valves V2u to V2w start the off operation at the position θ = θ8 and the end of the off operation at the position θ = θ9. The average angular velocity (α / Δt) of the drive shaft from the start to the end of the first vacuum valve V1u to V1w is different from the average angular velocity of the drive shaft. ) Is faster than the average angular velocity (α ′ / Δt ′) of the drive shaft from when the second vacuum valves V2u to V2w start to end until they end, the first vacuum valves V1u to V1w It is determined that an abnormality different from aging has occurred in any of the above. When the deterioration of the first vacuum valve and the second vacuum valve is aged deterioration, there is no difference between the average rotational speed α / Δt and α ′ / Δt ′ above the threshold value. No determination is made that the valve is abnormal.

  In the above example, when the time required for the three-phase first vacuum valve and the second vacuum valve to perform the off operation is used as the first parameter and the second parameter, the drive shaft 4 In the process of rotating in one direction, the time Δt required for the drive shaft to rotate from the position θ = θ2 to the position θ = θ3 and the drive shaft rotate from the position θ = θ8 to the position θ = θ9. When Δt ′ is shorter than Δt ′ and there is a difference between the time Δt ′ required for the time and Δt ′ is shorter than Δt ′, any of the first vacuum valves V1u to V1w is different from the aging deterioration. Is determined to have occurred.

  In the present embodiment, the first vacuum valves V1u to V1w are turned on in the section from θ = θ6 to θ = θ7 while the drive shaft rotates in one direction (clockwise in the above example). Since the second vacuum valves V2u to V2w do not turn on, the drive shaft is used when detecting the presence or absence of abnormality by comparing the average angular velocities of the drive shaft when both vacuum switches are turned on. The average angular velocity of the drive shaft when the first vacuum valves V1u to V1w are turned on in the interval θ = θ6 to θ = θ7 in the process of rotating in one direction, and the drive shaft in the other direction (counterclockwise) The average angular velocity of the drive shaft when the second vacuum valves V2u to V2w perform the on operation in the section from θ = θ9 to θ = θ8 in the rotating process is compared.

  In carrying out the detection method of the present invention, the rotational angle position of the drive shaft 4 at each instant can be detected from the output of the absolute rotary encoder RE. In other words, from the output of the rotary encoder RE, it is possible to detect which position of the rotational angle position θ of the drive shaft 4 is 0 to θ11 at each moment.

  The time Δt (or Δt ′) required for the drive shaft 4 to rotate from the position where the vacuum valve ON operation (or OFF operation) is started to the position where the drive valve 4 is started is a timer when starting the rotation of the drive shaft. Is started, and when the rotary encoder detects that the drive shaft 4 has reached the position where the vacuum valve ON operation (or OFF operation) starts, the timer measurement value tx1 read and the rotary encoder drive It can be obtained by calculating a difference tx2−tx1 from the timer measured value tx2 read when it is detected that the shaft 4 has reached the position for completing the ON operation of the vacuum valve.

  For example, a timer is started when rotation in one direction of the drive shaft 4 is started, and the rotary encoder detects that the rotation angle position θ of the drive shaft has reached the position θ6 (position in FIG. 3C). When the measured value tx1 of the timer is read, the measured value tx2 of the timer is read when the rotational angle position θ of the drive shaft reaches the position θ7 (the position shown in FIG. 3D), and the calculation of tx2−tx1 is performed. As a result, the time Δt required from the start of the first vacuum switch V1u to V1w to the end thereof can be obtained, and the first vacuum switch V1u to V1w can be turned on. By dividing the rotation angle (known angle) α of the drive shaft by Δt, the rotation speed when the first vacuum switches V1u to V1w are turned on can be obtained.

  The above threshold is the difference between the operating speed of the first vacuum valve and the second vacuum valve caused by the variation in the quality of the vacuum valve and the difference in the rotational speed of the drive shaft to be compared. When the first and second vacuum switches are turned on (or turned off), the rotational speed of the drive shaft is different, or when the drive shaft is rotated in a different direction. Since the first vacuum switch and the second vacuum switch may be set in consideration of the difference in rotational speed of the drive shaft when the ON operation (or OFF operation) is performed, the setting is Easy. For example, the rotational speed of the drive shaft and the second vacuum valve when the first vacuum valve is turned on (or turned off) immediately after the switching switch is assembled using a normal new vacuum valve. Performs a test to detect the rotational speed of the drive shaft when the on-operation (or off-operation) is performed, and sets the threshold to a value slightly exceeding the difference in rotational speed of the drive shaft obtained as a result of this test You can do that.

2 Switching Open / Close Device 201 Cam Mechanism 20 Drive Cam 20u-20w Drive Cam Convex 21u-21w Cam Follower 22u-22w Cam Follower 3 Stopper Mechanism 31 Auxiliary Cam 32 L-shaped Lever 33 Auxiliary Cam Follower 4 Drive Shaft 701 Oldham Joint 702 Insulated Shaft RE Rotary Encoder R Current limiting resistor Wm Main winding Wt Tap winding t1 to t11 Tap T1 Odd tap selector T2 Even tap selector V1u to V1w First vacuum valve V2u to V2w Second vacuum valve SW selector switch S1 selector switch Odd tap side fixed contact of S2 Even tap fixed contact of changeover switch

Claims (6)

A three-phase first vacuum valve that opens and closes a load current that flows through the tap selector when the tap is switched, and a three-phase second vacuum valve that switches on and off a current limiting resistor that limits the circulating current that flows when the tap is switched. A switching switch having a switch, and the tap selector is driven to rotate in one direction when switching from a state in which the tap selector selects an odd-numbered tap to a state in which an even-numbered tap is selected, and the tap selector selects an even-numbered tap. Each of the three-phase first and second vacuum valves, the drive shaft that is rotated in the other direction when switching from the state to the state that selects the odd-numbered tap, the drive cam that is rotated together with the drive shaft, and the three-phase first and second vacuum valves The cam follower is provided in contact with the cam surface of the drive cam, and the displacement of each cam follower is accommodated in the process in which the drive shaft is rotationally driven in each direction. Presence or absence of abnormality of the vacuum valve of the on-load tap switching device that causes the three-phase first vacuum valve and second vacuum valve to open and close in a predetermined sequence by transmitting to the operating shaft of the vacuum valve A method of detecting
A rotary encoder that detects the rotation angle of the drive shaft is attached to the drive shaft, and the rotation angle of the drive shaft detected by the encoder when the drive shaft rotates in one direction or the other direction and the drive shaft A first parameter including information on the rotational speed of the drive shaft from the elapsed time when rotating in one direction or the other direction to when the three-phase first vacuum valve starts the ON operation and ends. And a second parameter including information on the rotational speed of the drive shaft from the start to the end of the three-phase second vacuum valve, and comparing both parameters,
From the result of comparing the first parameter and the second parameter, the rotational speed of the drive shaft and the three-phase first time from when the three-phase first vacuum valve starts to end until the three-phase first vacuum valve ends. When it is determined that there is a difference greater than or equal to a threshold value between the rotational speed of the drive shaft from when the two vacuum valves start to end until the two vacuum valves are turned on, the three-phase first vacuum valve and Detecting that there is an abnormality in any one of the three-phase vacuum valves having a slower rotational speed of the drive shaft from the start to the end of the second vacuum valve;
An abnormality detection method for a vacuum valve for a switching switch of a tap switching device when loaded. The first parameter is an angle of rotation of the drive shaft while the drive shaft is rotated from a position at which the first vacuum valve is turned on to a position at which the first vacuum valve is turned on, and the drive shaft is at the first vacuum. The angular velocity of the drive shaft obtained by dividing by the time required to rotate from the position where the on-operation of the valve is started to the position where it is finished,
The second parameter is a rotation angle of the drive shaft while the drive shaft is rotated from a position at which the second vacuum valve is turned on to a position at which the second vacuum valve is turned on, and the drive shaft is at the second vacuum. 2. A vacuum valve for a switching switch of an on-load tap switching device according to claim 1, wherein the angular velocity of the drive shaft is obtained by dividing by a time required to rotate from a position at which the on-operation of the valve is started to a position at which it is terminated. Anomaly detection method.   The first parameter is a time required for the drive shaft to rotate from a position where the on-operation of the first vacuum valve is started to a position where the drive shaft is finished. 2. The method for detecting an abnormality in a vacuum switch for a switching switch of an on-load tap switching device according to claim 1, wherein the time is required to rotate from a position at which the on operation of the second vacuum valve is started to a position at which it is terminated. A three-phase first vacuum valve that opens and closes the load current that flows through the tap selector when the tap is switched, and a three-phase second vacuum valve that switches on and off the current limiting resistor that limits the circulating current that flows when the tap is switched And a switching switch having a switch, and when the tap selector is switched from a state in which an odd tap is selected to a state in which an even tap is selected, is rotated in one direction, and the tap selector selects an even tap. Each of the three-phase first and second vacuum valves, a drive shaft that is rotationally driven in the other direction when switching from the existing state to a state that selects odd taps, a drive cam that is rotated together with the drive shaft, and And a cam follower that is provided against the cam surface of the drive cam and responds to the displacement of each cam follower while the drive shaft is rotationally driven in each direction. By transmitting to the operating shaft of the vacuum valve, the three-phase first vacuum valve and the second vacuum valve can be opened and closed in a predetermined sequence, and the abnormality of the vacuum valve of the on-load tap switching device A method for detecting presence or absence,
A rotary encoder that detects the rotation angle of the drive shaft is attached to the drive shaft, and the rotation angle of the drive shaft detected by the encoder when the drive shaft rotates in one direction or the other direction and the drive shaft A first parameter including information on the rotational speed of the drive shaft from the elapsed time when rotating in one direction or the other direction until the three-phase first vacuum valve starts to end and ends And a second parameter including information on the rotational speed of the drive shaft from the start to the end of the three-phase second vacuum valve, and comparing both parameters,
From the result of comparing the first parameter and the second parameter, the rotational speed of the drive shaft and the three-phase first time from when the three-phase first vacuum valve starts to end until the three-phase first vacuum valve ends. When it is determined that there is a difference greater than or equal to a threshold value between the rotational speed of the drive shaft from when the two vacuum valves start off until they end, the three-phase first vacuum valve and Detecting that there is an abnormality in any one of the three-phase vacuum valves having the higher rotational speed of the drive shaft from the start to the end of the second vacuum valve.
An abnormality detection method for a vacuum valve for a switching switch of a tap switching device when loaded.   The first parameter is an angle of rotation of the drive shaft while the drive shaft rotates from a position at which the first vacuum valve starts to be turned off to a position at which the first vacuum valve is turned off. The angular velocity of the drive shaft obtained by dividing by the time required to rotate from the position where the valve OFF operation is started to the position where it is finished, and the second parameter is the second speed of the drive shaft. The rotation angle of the drive shaft during rotation from the position at which the vacuum valve off operation is started to the position at which the vacuum valve is turned off is rotated from the position at which the drive shaft starts the off operation of the second vacuum valve to the position at which it is ended. The method for detecting an abnormality of the vacuum valve for a switching switch of the on-load tap switching device according to claim 4, wherein the angular velocity of the drive shaft is obtained by dividing by the time required for the switching.   The first parameter is a time required for the drive shaft to rotate from a position at which the off operation of the first vacuum valve is started to a position at which the drive shaft is finished. The abnormality detection method for the vacuum valve for a switching switch of the on-load tap switching device according to claim 4, wherein the time is required to rotate from a position at which the second vacuum valve is turned off to a position at which the second vacuum valve is turned off.

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