JPH033305A - Safety device for enclosed electrical machinery and apparatus - Google Patents

Abstract

PURPOSE:To enable the title safety device for absorbing and combining with any noxious gas produced in an internal accident so that the noxious gas concentration may be reduced down to allowable level to be discharged outside by a method wherein the equipment main body container of the title safety device is provided with an internally communicated automatic resetting valve, a cooling down reaction vessel, a high pressure preventive vessel, an adsorption reaction vessel, a noxious gas concentration sensor, a pressure detector and a discharge valve part having a valve body successively following after the automatic resetting valve. CONSTITUTION:The title safety device is composed of an equipment main body container provided with an internally communicated automatic resetting valve 6, a cooling down reaction vessel 7 containing a reactive solution, a high pressure preventive vessel 8, an adsorption reaction vessel 9, a noxious gas concentration sensor 11, a pressure detector 12 and a discharge valve part 10 having a valve body 13 correspondingly controlled by the outputs from respective elements successively communicating with the automatic resetting valve 6. For example, the said cooling down reaction vessel 7 is to contain the reactive solution to be combined with the noxious gas so that a led-in gas may bubble to be cooled down as well as reacted. Furthermore, the high pressure preventive vessel 8 is to be a container having a large high pressure preventive space at lower pressure than the atmospheric air pressure while the adsorption reaction vessel 9 is to contain a dry adsorbent adsorbing the noxious gas.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a safety device for disaster prevention of pressure release in the event of an internal accident in sealed electrical equipment.

B0 Summary of the Invention The present invention provides a safety device for a sealed electrical device, which includes an automatic return valve that communicates with the inside of the device main body container, followed by a cooling reaction tank, a pressure relief tank, an adsorption reaction tank, a harmful gas concentration sensor, By installing a pressure detector and a discharge valve equipped with a valve body, in the event of an internal accident, harmful gases are absorbed, combined, reduced to a permissible concentration, and then discharged to the outside.

C0 Conventional technology In recent years, sealed electrical equipment such as power receiving and substation equipment that should be installed in densely populated urban areas has become more reliable, more compact, has a larger capacity, and has improved disaster prevention performance. .

BACKGROUND ART Conventionally, in such sealed electrical equipment, for example, electromagnetic induction equipment, large-capacity nonflammable equipment filled with SFs insulating gas has been put into practical use.

Such large-capacity equipment uses nonflammable liquids such as fluorocarbon liquids for cooling to improve performance.

In addition, a pressure relief valve (safety valve) is installed in case an accident occurs inside the equipment.
Normally, the structure is such that when the internal temperature rises and the internal pressure rises due to arc energy during an internal accident, the pressurized gas inside is released to the outside.

D1 Problems to be Solved by the Invention In conventional sealed electrical equipment configured as described above, the temperature at the accident point drops to 1 due to arc energy during an internal accident.
Since the temperature reaches 0000°K, the SF filled inside
s Insulating gas and media such as fluorocarbon liquid may be thermally decomposed and generate harmful gases.

When the internal pressure of the equipment increases due to this accident,
There is a problem in that this harmful gas is released from the pressure relief valve to the outside, posing the risk of deteriorating the environment in urban areas.

In addition, increasing the capacity of such sealed electrical equipment increases the arc energy in the event of an internal accident, and increases the concentration of harmful gases generated by thermal decomposition. There was a problem in that it became an impediment to this.

In view of the above-mentioned points, the present invention provides a new safety device that reduces the harmful gas discharged to the outside from the safety valve to a permissible concentration or less when an internal accident occurs in a sealed electrical device. The purpose is to enable larger capacity of sealed electrical equipment.

81 Means for Solving the Problems The safety device for a sealed electrical device of the present invention is connected to the container of the main body of the device so as to be able to communicate through an automatic return valve, and from which a reaction liquid that combines with a harmful gas is sequentially communicated. The present invention is characterized in that it is configured by installing a cooling reaction tank, a pressure relief tank, an adsorption reaction tank, and a discharge valve section including a harmful gas concentration sensor, a pressure detector, and a valve body.

F6 action By configuring as described above, in the event of an internal accident,
When the harmful gas is absorbed and combined and its concentration becomes below the allowable concentration, the harmful gas concentration sensor works to press out the harmful gas.

G. Embodiment Hereinafter, an embodiment of the safety device for sealed electrical equipment of the present invention will be explained with reference to FIGS. 1 to 3.

FIG. 1 is a schematic structural diagram of the apparatus of this example, and 1 is a nonflammable sealed electromagnetic induction device main body whose cooling performance is improved by using a refrigerant such as fluorocarbon liquid.

An iron core 2 and a winding 3 are arranged inside this sealed device main body l. Furthermore, a cooler 4 for cooling the iron core 2 and the windings 3 is installed in the sealed device body 1.

In the figure, 5 is a safety device for releasing pressurized gas inside the device in the event of an internal accident.

The safety device 5, which detects the gas with a force detector and opens the valve body to release gas to the outside, has its upper end communicated with a pipe port provided at the upper part of the sealed device main body l via an automatic return valve 6. Install it so that it is hung vertically downward.

The safety device 5 includes a cooling reaction tank 7 and a pressure relief tank 8 from the upper side.
, an adsorption reaction tank 9 and a discharge valve section 10 are vertically connected.

This cooling reaction tank 7 is filled with a reaction liquid that combines with a harmful gas so that the introduced gas is cooled by bubbling and reacted.

The pressure relief tank 8 has an internal pressure lower than atmospheric pressure,
This is a container with a large amount of vacuum space.

The adsorption reaction tank 9 is formed by enclosing a dry adsorbent for adsorbing harmful gases.

The discharge valve section 1O is provided with a harmful gas concentration sensor 11 and a pressure detector 12, and is further provided with a valve body 13 that allows internal gas to be discharged to the outside.

The operation of the safety device 5 configured as described above is controlled by a control section as shown in FIG.

That is, the pressure detector 12 that measures the pressure of the insulating gas in the safety device 5 and the harmful gas concentration sensor 11 are connected by an AND circuit, and this output is used to detect the gas discharge valve! 3 is configured to open. Then, when the pressure detector 12 outputs a signal indicating that the gas discharge valve operating pressure is higher than the operating pressure, and the harmful gas concentration sensor 11 outputs the output lower than the allowable concentration, the valve body 1
3 to open the gas to discharge the gas. By doing this, it operates as follows. First, harmful gas generated by arc energy within the sealed device main body 1 during an internal accident is evacuated into the safety device 5 through the automatic return valve 6, which is automatically opened due to an increase in internal pressure. Then, this high-temperature, high-pressure gas enters the cooling reaction tank 7, is bubbled, and is cooled. At the same time, the harmful gases are combined with good adsorption following the rapid change, and are extremely effectively reduced. .

In addition, since the cooling reaction tank 7 of this example is filled with the reaction liquid, the adsorption followability against rapid changes in the harmful gas can be better compared to dry adsorption means.

Moreover, with dry adsorption means, a large amount of dry adsorbent is required in order to adsorb harmful gases to below the permissible concentration, which results in a large pressure loss when the gas is passed between the dry adsorbents, resulting in a reduction in internal pressure. Although the effectiveness is impaired, this can be prevented and made more economical and compact.

In addition, since the temperature of the high-temperature gas is reduced in the cooling reaction tank 7, the pressure reduction effect is also good.

The released gas then enters the vacuum tank 8. Here, since the pressure inside is lower than atmospheric pressure, the equivalent pressure escape space is large, and the pressure is further reduced by entering this inside. Also,
Since this vacuum tank 8 is filled with the reaction liquid cysts in the cooling reaction tank 7, the concentration of harmful gases is also reduced.

Next, the gas is introduced into the adsorption reaction tank 9, and its harmful gas components are adsorbed by the dry adsorbent, and the concentration becomes below the permissible level.

Then, the gas from which harmful components have been removed to below the permissible concentration is released to the outside through the opened valve body 13.

Next, when the pressure detected by the pressure detector 12 drops to the normal pressure, the valve element 13 is closed in response to the signal, in preparation for the next time that harmful gas is sent.

In addition, in the control section of the apparatus of this example, in order to protect the sealed device main body 1, the automatic return valve 6 is detected to be opened, and the pressure detector 12 detects the high pressure that must be used to protect the sealed device main body 1. When detected, a protection circuit section is provided which opens the valve body 13 to release pressure and protect the sealed device main body.

The above-mentioned operation can also be expressed as an operation algorithm illustrated in FIG. In this figure, (a) is the operating pressure of the automatic return valve on the equipment body, (b) is the operating pressure of the gas discharge valve, and (
(1) means the automatic return valve opening operation, (1) means the escape pressure space is filled, (e) means the valve body opening operation, and (force) means the occurrence of an accident inside the equipment body.

H1 Effects of the Invention As detailed above, according to the safety device for a sealed electrical device of the present invention, the device is connected to the main body container of the device through an automatic return valve so as to be able to communicate with it, and from this point on, the gas is combined with a harmful gas so as to be sequentially communicated. A cooling reaction tank containing a reaction liquid, an escape pressure tank, an adsorption reaction tank, and a discharge valve equipped with a harmful gas concentration sensor, a pressure detector, and a valve body are installed. When the concentration of gas is absorbed and combined and becomes below the allowable concentration, this is detected by a hazardous gas concentration sensor and a pressure detector, and the valve body is opened to release the gas to the outside, thereby preventing environmental deterioration. Therefore, it improves the disaster prevention properties of sealed electrical equipment equipped with this safety device in the event of an internal accident, improves safety when installed in densely populated areas in urban areas, and enables larger capacity electrical equipment. Moreover, it has the effect of improving safety when installed underground or indoors.

In addition, since a cooled reaction tank containing the reaction liquid is used, the adsorption ability to follow rapid changes in harmful gas is good, and the pressure loss in the gas passage is reduced, making the equipment compact.
It has the effect of being inexpensive.

[Brief explanation of drawings]

Fig. 1 is a schematic overall configuration diagram showing one embodiment of the safety device for sealed electrical equipment of the present invention, Fig. 2 is a logic circuit diagram of its control section, and Fig. 3 is a diagram for explaining its operation. It is an algorithm diagram. DESCRIPTION OF SYMBOLS 1... Sealed equipment body, 5... Safety device, 6... Automatic return valve, 7... Cooling reaction tank, 8... Pressure relief tank, 9...
... Adsorption reaction tank, 10... Discharge valve section. Fig. 1 Overall configuration diagram 7... Cooling reaction tank 8... Pressure relief tank 9... Adsorption reaction tank 10... Discharge valve section 25-

Claims (1)

[Claims] (1) An automatic return valve that communicates with the inside is installed in the main body container of the equipment, and the cooling reaction tank containing the reaction liquid, the pressure relief tank, the adsorption reaction tank, and the hazardous 1. A safety device for a sealed electrical device, comprising a gas concentration sensor and a pressure detector, and a discharge valve section having a valve body that is controlled in accordance with the output of the pressure detector.