JPS60152013A - Electrical energy distributing apparatus built in with arrester - Google Patents

Abstract

PURPOSE:To enable to perform the withstand voltage test and the induced test of an electrical energy distributing apparatus built in with arresters using a switch of one piece by a method wherein the earth sides of the arresters connected through branch lines are connected in common to be earthed through the switch. CONSTITUTION:Branch lines 11 are led out from the midway of lead wires 3 connecting a high voltage winding 1 and high voltage bushings 2. Arresters 5 are connected respectively to the branch lines 11 thereof. The earh sides of the arresters 5 thereof are connected in common, and a switch 4 of one piece is provided between the commonly connecting place thereof and the inside wall of a tank 7. To operate the arresters 5, the switch 4 is closed. When a withstand voltage test is to be performed, by opening the switch 4, the arresters 5 are cut apart from the earth. When an induced test is to be performed, by opening also the switch 4, the arresters of two pieces are connected in series.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power distribution device with a built-in arrester, and particularly to one having a configuration that simplifies testing work.

A conventional power distribution device with a built-in arrester has the configuration shown in FIG. FIG. 1 shows an example of a single-phase transformer with a built-in arrester, and the high-voltage winding 1 and high-voltage bushing 2 have leads lj! 3, and ground wires 6 are branched from the middle of this lead wire 3 to connect to a switch 4 and an arrester 5.
It is grounded to the tank inner wall 7 via. 8 is a ground wire. Further, the low voltage winding 10 is connected to the low voltage boot/ring 9. In such a configuration, for a single-phase transformer,
The arrester 5 has two branch circuits, but in the case of three phases, three branch circuits are required.

When conducting an open frequency withstand voltage test (referred to as a withstand voltage test) and an induced withstand voltage test (referred to as an induction test) to such a transformer with a built-in arrester, these test voltages are higher than the direct voltage at which the arrester 5 starts operating. , during the trial j test, the arrester 5 is activated and charges i', f.

There is a situation where the flow is flowing. For example, if the peak value of the test direct voltage is (i KV), the voltage values shown in the following table will occur.

For this reason, the test is conducted with the switch 4 open, or the arrester 5 is removed if the structure does not allow the switch to be removed. Therefore, the number switch 4 in the tank
However, the disadvantage is that it takes a long time to remove the arrester 5. Further, the structure in which switches 4 are added to the branches of each phase leads to an increase in the size of the tank.

In view of the above-mentioned drawbacks, the present invention aims to provide a power distribution device with a built-in arrester that simplifies the operation of the switch and has a smaller tank.

The basic idea of the present invention to achieve all of these objects is to connect the ground sides of the arresters connected to the branch line in common and to ground them through a switch.

An embodiment will now be described with reference to FIG.

The same parts as in FIG. 1 are given the same reference numerals. A branch wire 11 is led out from the middle of the lead wire 3 that connects the high voltage winding 1 and the high voltage bushing 2. Arresters 5 are connected to each of these branches @11. The ground sides of the arresters 5 are commonly connected, and one switch 4 is interposed between this common connection point and the tank inner wall 7. therefore,
In order to operate the arrester 5, it is necessary to close the switch 4, and in order to prevent the arrester 5 from operating, it is necessary to close the switch 4.

In such a configuration, in the case of a withstand voltage test, the arrester 5
is disconnected from the ground, that is, the switch 4 is opened and there is no problem. In the case of an induction test, the two arresters 5 open the switch 4 as well. In this case, the switches 4 are connected in series, and the voltage applied to each arrester 5 is F2/2 times the applied voltage E applied to the high voltage winding IJ+1. In the case of three-phase equipment,
When three arrester branch circuits are connected in common, the voltage applied to the arrester 5 becomes 84 voltages.

Therefore, in any of the withstand voltage tests, a voltage higher than the operation start pressure is not applied to the arrester 5 with the switch 4 open, making the test possible.

Therefore, any test can be performed by opening one switch 4.

Note that the above explanation can also be applied to other power distribution equipment such as a switchgear with a built-in arrester.

As explained above, according to the present invention, any test can be performed by opening one switch. Since only one switch is required for either a three-phase switch or a three-phase switch, the tank shape is correspondingly smaller and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of a conventional transformer with a built-in arrester, and FIG. 2 is a block diagram showing an example of a power distribution device with a built-in arrester according to the present invention. In the drawing, 4 is a switch. 5 is an arrester, 7 is an inner wall of the tank, and 11 is a branch line. Patent applicant: Takagaku Seisakusho Co., Ltd. Patent attorney: Shibu Mitsuishi (and 1 other person) Figure 1 2 Figure 2

Claims (1)

[Claims] In a device in which the current-carrying part of the main body of the power distribution equipment housed in a tank is grounded via an arrester, a branch line is connected to each of the above-mentioned current-carrying parts of each phase, and each branch line is connected to the arrester wire, and the arrester is connected to the ground. A power distribution device with a built-in arrester, characterized in that the ground side is commonly connected, and this common connection point is grounded to the inner wall of the tank via a switch.