JPS58103822A - Induction electric device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an I8 pyroelectric device, and more particularly to a conductive pyroelectric device in which the main body of the device is housed in a well-grounded tank filled with an insulating medium.

In general, a 1m induction electric equipment such as an oil-insulated or gas-insulated transformer or reactor is filled with an insulating medium such as insulating oil or gas, and is grounded and placed in a mourning tank 1, as shown in Fig. 1. A bushing 6 houses a device main body 4 consisting of an iron core 2 and a three-phase coil wound around the iron core 2, and inserts an input/output terminal 5 of the device main body 4 into a tank 1.
In the event of an accident due to a flash arc between the photoelectric section such as the input/output terminal 5, which is led out from the tank 1 through the tank 1 and the input/output terminal 5 inside the tank 1, and the tank 1 at ground potential! In order to prevent damage to the link 1, a wrinkle 7 was provided and the holder was placed in place.

However, with the increase in the capacity of induction electrical equipment in recent years, the size of the tank has become larger for those with a voltage of 275KV or 500KV, and the point of flash arc zero generation and the pressure relief valve of the pressure relief device have become larger. Some sails have been sailed with a distance of more than 109% between the two, and the arc energy of flash arcs has also increased due to ultra-high voltages.

Furthermore, when an internal flash fault occurs in induction electrical equipment using insulating oil as an insulating medium, the propagation speed of the S shock wave in the oil is approximately 1200 cycles/sea, so the point of occurrence of the flash arc is If the distance to the pressure relief valve is M 1011&, the time it takes for the shock wave to reach the pressure relief valve is approximately 0.0.
08 sec, in other words about 0.08 sec. ．． 42~(5011
8 base) vr praise. For this reason, the tank groans, and the dimensions of the tank P-3V, which are usually made of copper plate, are instantly damaged.
! ! Although it has the effect of increasing 15Il, there is a risk of an explosion occurring if it fails during the period between the occurrence of an accident and the activation of the pressure relief valve.

In addition, when an internal flash fault occurs in an induction electric machine using insulating gas as an insulating medium, the propagation speed of the shock wave in the air is l.
Since t is approximately 350 to 400 s/#・C, the distance from the flash arc generation point to the pressure relief valve cylinder is mt-1Qm,
11 If the propagation speed of the shock wave is 400 tn/sea, the time it takes for the shock wave to reach the relief valve is 0,0.
25 sec (2.5 ~ at 50 JIB pace)'.

Therefore, a tank filled with oil has a much higher probability of breaking or exploding, and even if the tank does not generate explosive force and the pressure relief valve operates effectively, the insulating gas is sy.

If it is a gas, there is a risk that the gas will be decomposed by the open circuit arc and a toxic gas of 11.

Therefore, which ll8Il! Even when a medium is used, it is uneconomical because the tank has to be overloaded, and if toxic gas is released, a device must be installed to absorb this gas. There are gaps.

This invention was created by the present inventor after considering the above-mentioned good questions, and its purpose is to create a trigger-type vacuum gap between the live part of the Shinichi main body and the tank, and to
Install a current transformer *1 on both or either one of the input side and the output hook of the main unit, and apply a high voltage to the trigger electrode of the vacuum gap using the difference 1 * or overcurrent between the current transformers as a signal. When an accident occurs between the tanks, a vacuum gap is ignited between the tank and the photoelectric section to immediately extinguish the internal flash arc, thereby preventing damage to the tank or explosion. We are here to provide you with the best electrical conduction equipment.

Hereinafter, the implementation IPI of the present invention will be explained with reference to the drawings after Figure 2.
KI for details! I will clarify.

The induction electrical equipment according to the present invention is an example of an oil-immersed transformer.
As shown in Figure 2, IIk! When the primary coil 9 and secondary coil 10t, which are the fF main body, are stored, the input 1m terminal 9υ of each phase of tt, y, and w of the primary coil 9 (only the U phase is shown in the figure) and U of 2nd order ll1l goy #10.

The output side terminals 10σ of each phase of V and W (only the LU phase is shown in the figure), the t-tank 8KlllllIl, and the p-tank 8 are also derived from the respective bushings 11 and are roughly connected. There is a trigger type vacuum gap 12 between the input terminal and/or output terminal of each phase entering the tank 8 and the inner wall of the tank 8. (only shown) are connected through each other. Trigger type vacuum gap 12Fi, using its internal discharge to cause an accident due to a flash arc between the inner wall of the tank 8, momentarily ground the output terminal (photoelectric S) to eliminate the flash arc. A plurality of insulating cylinders 131 formed in a cylindrical shape and made of nine ruts are coaxially joined to form one insulating cylinder, and both open ends of the round insulating cylinders are connected to a disc-shaped insulating cylinder. The metal end plates 14 are closed and the interior 2 is evacuated to a high vacuum to form a vacuum tube 11, and a lead rod is airtightly introduced from the center of each metal end plate 14 of the vacuum chamber. A support fitting 17 is placed between the electrodes 16 provided on the inner edge of the
The electrode rods 19 with electrodes 18 attached to both ends are appropriately spaced apart from each other on the axis of the vacuum vessel to form a plurality of gaps 20i. The tip S of a trigger electrode n, which is introduced by penetrating the metal end plate 14 airtightly through an insulator 21, is opposed to the metal end plate 14 (on the left) with an appropriate gap. The outer end of the nine-lead rod 15 inserted into one metal end plate 14 of the vacuum gap n is connected to the inner wall of the tank 8 via the connection 1lIi 23, and the outer end of the nine-lead rod 15 is inserted into the other metal end plate 14. The outer end of the lead rod 150 is connected to an output terminal, which is a charging part, in the tank 8 via a connection 1124. Also, 25 m in M 2 @
, 25b, and 25o are shields for securing the circular direction of the insulating cylinder 13, respectively.

A through-type current transformer @2S, 27 is fitted in the tank 8 to the output terminal of each phase (only the U phase is shown in FIG. 2), and these current transformers, No. 27 is connected in reverse so that no differential current is generated under normal load operating conditions and a differential current is generated only in the event of an accident due to a flashover arc, and is connected to the primary coil 28a of the instrument transformer 11528. One end of the secondary coil 28b of the instrument transformer section is connected to the trigger electrode n of the vacuum gap 12.
The other end of the secondary coil 281) is connected to the connection 1123 that connects the tank 8 and one lead rod 15! ! It is continued.

With the above configuration, in the tank 8, the darkness between the inner wall and the input line 9U of the U phase on the primary side is caused by the flash arc. A short circuit occurs when a short circuit current flows, so current flows through the primary coil 28 of the instrument transformer row due to the difference current between the transformers @21s and 27, and a current flows through the secondary coil 281) of the instrument transformer section. A high voltage is applied to a trigger electrode n in a vacuum gap n. As a result, arc plasma is generated between the tip of the trigger electrode n and one metal end plate 14 at ground potential, and this arc plasma is diffused into the vacuum chamber and the arc voltage in the vacuum is caused by the arc in the insulating oil. Since the voltage is O''15Q~'koos degree, each gear ring is simultaneously informed by the arc plasma.Therefore, the U-phase input terminal 9U on the primary side and the arc potential tank 8 are connected to the vacuum gap 12'.
are electrically connected through a flash arc of about 0.5 to (1
0 ma), the internal pressure rise is also stopped, and damage or explosion of the tank 8 is prevented at 111*.

In addition, the person, output terminal and tank 8 due to the vacuum gap 12
The arc plasma i interposed between each gap 9 of the vacuum gap 12 disappears near the natural zero value of the current, and the arc is automatically cut off. The insulating medium is an insulating gas, for example 81-
In the case of gas, the arc voltage in vacuum is 8y/about AO of the arc voltage in gas, and the output terminal is grounded by the vacuum gap 12 in the same way as with insulating oil. be.

In the embodiment described above, in order to obtain the voltage t- applied to the trigger electrode 22 of the vacuum gap 12, the variable fI is
We have described a case in which the alternating current from the L device ah, n is directly input as a signal to the instrument transformer-3, but the case is not limited to this. For example, as shown in Fig. 3, the instrument transformer A DC power supply is used to apply the voltage to the electrodes 22KTo through the 28 tubes, and an automatic stop tie is used as the external circuit! An inverter 29t- with a built-in inverter 29t- is provided, and the opening/closing of the blood flow (b) path input to this inverter is performed by a relay (9) activated by the difference current of 27 through current transformation. It is okay to do so.

In the above-mentioned mourning case, mines and instrument transformers participate.
This article describes the case where a reversely connected current transformer fitted to the output terminal in the tank 8 was used as a differential voltage signal in order to induce a voltage at the input terminal or at the output terminal. For example, if either the input terminal or the output terminal is fitted with a current transformer, it can be used as a signal to induce a voltage directly or indirectly in the overcurrent transformer. It's also good.

Furthermore, the above-mentioned l! In the example, the vacuum gap 1
2 is placed in the tank 8, and the case 9 is described above, but the case is not limited to this.
1 and arranged above the tank 8, and placed inside the tank 8 via an insulating spacer.

It is also possible to make a T-connection between the output terminal and the vacuum gap.

Further, in the above-described embodiment, the vacuum gap 12 is described as having a plurality of gaps 20, but the vacuum gap 12 is not limited to this, and may have one gap in a single insulating cylinder. Of course, as described above, the present invention provides an induction electric machine in which the main body of the device is housed in a tank filled with an insulating medium and grounded, between the live part of the main body and the tank. A trigger type vacuum gap tube is inserted, and a current transformer is installed on either the input side or the output side of the device body, and the differential current fIt or overcurrent of the current transformer is used as a signal. Since it is designed to apply a high voltage to the trigger electrode of the trigger type vacuum gap, it immediately extinguishes flash arcs caused by internal flash faults and reliably prevents tank damage and explosions. can do. Therefore, it is economical because there is no need to increase tank strength as the tank becomes larger, and the insulating medium is 8I.
P@ The toxic decomposition β of this even if it is a gas
This provides the advantage that it is not necessary to provide a storage device.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conductive horizontal machine of the present invention, Fig. 2 is a schematic diagram of an induction electric device according to the present invention, and @3 is a circuit diagram of another embodiment of the present invention. be. 8...tank, 9...primary coil, 9TT...input terminal, Δ sacrifice 10...secondary coil, 10u...output pin, 12...
...Vacuum gap, η...Trigger electrode, part, 27...
・Variable flL powder, attack...Instrument transformer.

Claims (1)

[Claims] In an induction electric device in which a device main body is housed in a grounded tank filled with an insulating medium T, a trigger type vacuum gap is inserted between the live part of the device main body and the tank, and the input side of the device main body is and a current transformer S is disposed on both or either one of the output sides, and is arranged to apply a high voltage to the trigger electrode of the trigger type vacuum gap using the difference in the variable fIL trowel as a signal or an overcurrent. ＠4Kameki＠ware which is characterized by the following.