JPS62226607A - On-load tap changer - Google Patents

Abstract

PURPOSE:To obtain similar cooling characteristics even in the air as in oil by a structure wherein a resistance belt is immediately cooled by the rotation of an impeller at every change operation of taps. CONSTITUTION:A shaft 1 is driven and rotated, a spring 9 is compressed between a board 3 and a table 7, definite energy is accumulated, a catch mechanism is removed and the table 7 is moved. In these operations, a switching crank 13 is rotated and a current is interrupted by the operation of a breaking equipment. While the table 7 is operated, the projection 16 of the table 7 collides with the pin 15 of an impeller 14 and the impeller 14 is rotated. The impeller 14 moves a gas downwards by its moment of inertia using the boss of the crank 13 as a fulcrum and continues to cool a current-limitting resistor R heated at the time of interrupting the current to decrease its temperature to one. This structure enables changing taps at the time of loading even in the air as in oil.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to a resistive on-load tap changer for application in air or gas.

(Prior technology) The new oil-immersed load tap changer, which is currently also popular with acid, uses insulating oil as an electrical insulating medium, as an arc-extinguishing medium during current interruption, or as a cooling medium for current-limiting low resistors. I am using it. This insulating oil is the most excellent medium, and this is the reason why this in-oil method is still used today.

On the other hand, as cities become overcrowded, there is an increasing demand for electrical equipment to be nonflammable, and nonflammable gas-insulated equipment has rapidly developed. On-load tap changers are one such type, and many products that use vacuum valves as new current interrupting elements have been commercialized.

(Problems to be Solved by the Invention) As is already well known, the on-load tap changer uses a current limiting resistor that suppresses the circulating current when the taps are short-circuited. Replacing the conventional oil-submerged on-load tap changer with a gas-insulated type would result in a large difference in the cooling characteristics of the current limiting resistor, leading to an increase in the size of the current limiting resistor. In this case, the on-load tap changer had to be made larger, which was a factor in increasing costs.

Therefore, in order to replace the conventional oil submerged type with a gas insulated type,
It becomes necessary to compensate for the difference between the two as a cooling medium.

An object of the present invention is to provide an on-load tap changer whose overall structure can be made compact by improving the cooling method for the current limiting resistor.

[Structure of the invention]

(Means and effects for solving the problems) The on-load tap switching device according to the present invention is a driving machine.

A hoisting plate that freely slides the guide rod in response to driving force from the mechanism, and a switching force for the switch that is arranged to freely slide the guide rod opposite to this hoisting plate and switches the sliding force. a reciprocating carriage having a switching crank that converts to the switching crank; a storage spring that is housed between the carriage and the hoisting plate and abuts against the carriage and the hoisting plate at both ends, respectively; This 1WD! The current limiting resistor is equipped with an impeller i installed on the jr shaft to send cooling gas to the current limiting resistor. is cooled to

(Example) An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a drive shaft connected to an electric operating mechanism (not shown), which transmits power from the electric operating mechanism. Reference numeral 2 designates an eccentric cam that rotates with the rotation of drive #1 and reciprocates the winding plate 3 via a sliding plate 4°4'. Reference numeral 9 is an energy storage spring, which is disposed so as to be sandwiched between the first hoisting plate 3 and the carriage 7, and stores static energy as the hoisting plate 3 moves. Reference numeral 5 is a guide rod of the winding plate 3 and the reciprocating table 7, each of which is supported at both ends by bearing stands 6, 6'.

11 is a sliding plate attached to the bottom of the carriage 7.

It is slidably coupled to a pin 12 rotatably provided on the switching crank 13. Reference numeral 14 denotes an impeller, which is rotatably attached to the gas section of the switching crank 13, and has a plurality of pins 15 above that collide with the protrusion 16 of the reciprocating table to rotate the impeller 14. .

8 is fixed to the switching crank 13, and the switching crank 1
3 is transmitted to the switching switch breaker 20 to perform a current breaker operation. R is a current limiting resistor that suppresses the circulating current when the taps are short-circuited during the switching operation of the breaker, and is arranged below the impeller 14.

The operation of the switching switch of the on-load tap changer of the present invention configured as described above will be explained. In FIG. 1, the drive shaft 1 rotates due to the operation of an electric operation mechanism (not shown), and the hoisting plate 3
The energy storage spring 9 is compressed between and the carriage 7 and stores energy. When a predetermined amount of energy is accumulated, a catch mechanism (not shown) is released, and the carriage 7 moves rightward in the figure due to the accumulated energy. This operation causes the switching crank 13 to rotate and operate the cutoff section to cut off the current.

During the operation of the carriage 7, the convex portion 16 of the carriage 7 shown in FIG.
The impeller 14 collides with the pin 15 of the impeller 14 to give rotation to the impeller 14. The impeller 14 rotates with its own moment of inertia using the boss portion of the switching crank 1:3 as a rotational fulcrum.

The gas is moved to the lower part of the diagram to cool the current limiting resistor R, which generates heat when the current is cut off, and then lowers the temperature of the resistance band to its original temperature. This operation is performed every time the tap is changed, and the same operation is repeated every time the tap is changed, so that the temperature of the resistance band is immediately lowered.

〔Effect of the invention〕

In the present invention configured as described above, the impeller rotates every time the tap is changed, so that the resistance I (F) is immediately cooled. Since the same cooling characteristics as the submerged type can be obtained, the configuration can be made the same as the submerged type, and the switching interval can also be made the same.

Also, since it has the same configuration as the oil-immersed type, it is compact.
! I can make 6 pieces.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the on-load tap changer of the present invention, and FIG. 2 is a sectional view taken along the line n--■ in FIG. 1... Drive 11'l! I 3...Hoisting plate 7...Reciprocating stand 9...Storage spring 11...
Sliding plate 12...Pin 13...Switching crank 14...-Impeller 15...Pin 1
6...Convex part R... Current limiting resistor 20... Breaking part agent Patent attorney Yoshiaki Inomata (one idiot) Figure 2

Claims (1)

[Claims] (1) A hoisting plate that freely slides the guide rod in response to the driving force from the drive mechanism of the tap changer under load; A carriage having a switching crank that converts the sliding force into a switching force for the switching switch, and a carriage which is housed between the carriage and the hoisting plate and abuts against the carriage and the hoisting plate at both ends, respectively. an energy storage spring to actuate the switching operation; a drive shaft that receives the switching force from the switching crank to cause the switching switch to perform the switching operation; and an impeller that is provided on the drive shaft and sends cooling gas to the current limiting resistor. An on-load tap switching device characterized by comprising: