JP2000269051A - No-voltage tap-changer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plurality of no-voltage tap-changers in a transformer to obtain four levels of voltage, with one tap doubling prescribed voltages of the transformer. SOLUTION: Changing sections of this no-voltage tap-changer are composed of three blocks TC1, TC2, TC3 and are mounted on a gear case 30. Each changing section has drive axes A-H at its center and fixing axes having fixing contacts 1-28, attached thereon in its outer periphery. Through the operation of an operation handle 31, rotation operation is transmitted to the drive axes via a Geneva guide 34 and a Geneva gear 33 (only TC1 is further provided with a spur gear) mounted in a gear case and movable contacts mounted on the drive axes connect or separate the fixed contacts with each other. Consequently, coil parts are connected in series or in parallel, and thereby four levels of voltage, each tap doubling the other, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a plurality of non-voltage tap changers in a single transformer and doubles a predetermined voltage of the transformer by an external operation of the transformer. 4
The present invention relates to a non-voltage tap changer capable of obtaining different kinds of voltages.

[0002]

2. Description of the Related Art One non-voltage tap changer is provided in one transformer, and winding portions are connected in series or in parallel.
A non-voltage tap changer for obtaining different kinds of voltages is used.

FIG. 4 shows a conventional non-voltage tap changer.
This will be described with reference to FIGS. FIG. 4 is a drawing showing an example of a conventional example in which tap terminals of tap windings connected in series and in parallel are drawn out and connected. FIG. 5 is a configuration diagram of a switching unit of a non-voltage tap changer showing an example of the related art. FIG. 6 is a structural diagram of an entire non-voltage tap changer showing an example of the related art. In FIG. 6, 1
4 are fixed contacts, K15 and K16 are drive shafts I and J, respectively.
This is a movable contact attached to. When the operation handle 31 is turned, the operation of the driving shafts I and I by the operation of the Geneva gear guide 34 and the Geneva gear 33 mounted in the gear case 30 is performed.
When J rotates and two tap windings are connected in parallel, tap terminals 1 and 3, 2 and 4 are connected as shown in FIG. 5; when J is connected in series, tap terminals 2 and 3 are connected. , The movable contacts K15 and K16 are switched.

[0004]

In the conventional transformer, only two times and up to two kinds of voltages can be obtained by switching between series and parallel connection. Therefore, four kinds of voltages are required twice more. Sometimes another transformer was needed. An object of the present invention is to provide a non-voltage tap changer that can obtain four types of voltages twice each by one transformer.

[0005]

A plurality of tap lead wires drawn from a transformer tap winding are connected to a fixed contact of a fixed shaft mounted on a circumference of a non-voltage tap changer, and a drive shaft is provided. A movable contact that rotates in accordance with the rotation of the connector connects or disconnects each fixed contact, and a plurality of switches that connect each winding portion in series or in parallel are provided. And a non-voltage tap changer capable of obtaining a voltage of In this way, by providing a plurality of switches in one transformer and switching the connection of each winding portion in series or in parallel, it is possible to obtain four types of voltages twice as many.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a transformer tap winding and tap terminal lead-out state of the present invention, in which tap terminals 1 to 28 are drawn out. FIG. 2 is a configuration diagram of a tap switching unit of the non-voltage tap switch of the present invention. The non-voltage tap switching unit is composed of three blocks TC1, TC2, and TC3. 1 to 28 are fixed contacts, A to H are drive shafts, and K1 to K14 are movable contacts mounted on the drive shafts respectively. FIG. 2 shows the minimum voltage required by the transformer (eg, 2.5 kV). Is a state in which is output. FIG. 3 is a structural diagram of the entire non-voltage tap changer, in which the blocks TC1, TC2 and TC3 are separately operated for a predetermined voltage. When the operation handle 31 is turned, the Geneva gear guide 34 and the Geneva gear 33 mounted in the gear case 30 are turned.
The operation of the drive shaft A
To H rotate, and the movable contact K attached to each drive shaft
1 to K14 are switched.

Next, regarding the operation of the non-voltage tap changer of the present invention, for example, a voltage of 2.5 kV is set to 5 kV, and a voltage of 5 kV is set to 1
The operation of switching from 0 kV to 10 kV to 20 kV will be described in order. (1) When switching the voltage from 2.5 kV to 5 kV In the block number TC3 of the no-voltage tap changer, the connection between the fixed contacts 25 and 26 is changed to the connection between 26 and 27, and the connection between 28 and 27 is changed to the connection between 28 and an empty terminal. Then, the drive shafts G and H are operated, and are switched by the operation of the movable contacts K13 and K14. (2) When switching the voltage from 5 kV to 10 kV In the block number TC2 of the non-voltage tap changer, the connection between the fixed contacts 17 and 18 is changed to the connection between 18 and 19, the connection between 19 and 20 is changed to the connection between 20 and the empty terminal, By operating the drive shafts E and F, the connection between 21 and 22 to the connection between 22 and 23, the connection between 23 and 24 to the connection between 24 and the empty terminal, and the movable contact K
Switching is performed by the operations of 9, K10, K11, and K12. (3) When switching the voltage from 10 kV to 20 kV In the block number TC1 of the no-voltage tap changer, the connection between the fixed contacts 1 and 3 is connected to 2 and 3, the connection between 2 and 4 is connected to 4 and the vacant terminal. Connection of 5 and 7 to connection of 6 and 7, connection of 6 and 8 to connection of 8 and empty terminal, connection of 9 and 11 to connection of 10 and 11, connection of 10 and 12 to 12 and empty By operating the drive shafts A, B, C, and D, the movable contacts K1, K2 are connected to the terminals, the connections 13 and 15 to the connections 14 and 15, the connections 14 and 16 to the connections to the free terminals 16, and so on. , K
Switching is performed by the operations of 3, K4, K5, K6, and K7.

[0008]

As described above, by using the non-voltage tap changer of the present invention, four types of voltages are successively applied to each block of the non-voltage tap changer twice by one transformer. It can be obtained by performing a switching operation.

[Brief description of the drawings]

FIG. 1 is a drawing showing connection and extraction of tap terminals of a transformer tap winding showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a switching section of a non-voltage tap changer showing an embodiment of the present invention.

FIG. 3 is a structural diagram of an entire non-voltage tap changer showing an embodiment of the present invention.

FIG. 4 is a drawing showing connection and connection state of tap terminals of series and parallel connection tap windings showing an example of the related art.

FIG. 5 is a configuration diagram of a switching section of a non-voltage tap changer showing an example of the related art.

FIG. 6 is a structural view of an entire non-voltage tap changer showing an example of the related art.

[Explanation of symbols]

1-28 tap terminal number (also used as fixed contact number) K1-K16 movable contact A-J drive shaft TC1, TC2, TC3 each block number of non-voltage tap changer 30 gear case 31 operating handle 32 indication display window 33 Geneva gear 34 Geneva gear guide 35 Spur gear 36 Fixed shaft

Claims (1)

[Claims] A plurality of tap lead wires drawn from a transformer tap winding are connected to a fixed contact of a fixed shaft mounted on a circumference of a non-voltage tap changer, and are connected to a rotation of a drive shaft. A movable contact that rotates accordingly connects or disconnects each fixed contact, and a plurality of switches that connect each winding portion in series or in parallel are provided to obtain four types of voltages by two times. Non-voltage tap changer.