JPS5937562B2 - Transformer fire extinguishing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A transformer 1 used in a power plant or the like generates high heat in a coil 2 when the transformer 1 is in operation, so it is filled with oil for cooling.

However, if a short circuit occurs due to poor insulation in the coil 2, heat is generated and the pressure inside the transformer 1 expands extremely, or if the bushing of the transformer 1 is struck by lightning, a part of the transformer 1 may be damaged. This causes an explosion (often causing damage to the top wall or bushing of the transformer), and the oil inside ignites, causing a fire.

In particular, a fire in transformer 1 is caused by the oil in the transformer igniting, and since the oil is extremely hot, it is likely to cause a major accident, and once the oil catches fire, it will not burn out. The fire will not be extinguished.

Therefore, in order to eliminate it by then, some kind of measure must be taken. Conventionally, this fire extinguishing was done using a transformer 1.
This has been done by injecting water into the area, but this requires a huge amount of expense because it requires connecting a long distance with a pipe from the water source to the location where the transformer 1 is installed.

The present invention supplies nonflammable gas into the transformer 1 through an oil layer therein, without using a liquid such as water for extinguishing the fire. A diaphragm is provided in communication with each discharge pipe, and an on-off valve that acts to cut off communication between the transformer and the auxiliary tank is electrically connected to a heat detector provided in the transformer. Only when the heat detector is activated, the oil in the transformer flows out from the discharge pipe and activates the diaphragm, and when the diaphragm is activated, nonflammable gas is ejected from the high-pressure gas cylinder. The fire extinguishing system was designed to operate only in the event of a fire in the transformer.

Embodiments of the invention will now be described with reference to the accompanying drawings.

Because it is necessary to immediately sense that a fire has occurred,
A conventionally known heat detector (approximately 120 to 150
It operates at °C. (not shown) is provided. An auxiliary tank 3 is provided near and above the outer periphery of the transformer 1, and both are communicated through a pipe 4.

An on-off valve 5 is provided in the middle of the pipe 4.

When transformer 1 is normal, pipe 4
In this case, the on-off valve 5 will not block the pipe 4, but the oil may move inside the transformer 1.
If, for example, the pipe breaks and explodes due to the above-mentioned causes and a fire occurs, the on-off valve 5 closes the pipe 4 and prevents the oil therein from flowing to the transformer 1 side. By doing this, it is possible to prevent oil from being poured onto the flames and causing a big fire (that is, to make the fire as small as possible). The reason why the on-off valve 5 blocks the pipe 4 when the transformer 1 explodes and a fire occurs is because the oil in the pipe 4 is different from normal when the transformer 1 is damaged due to an abnormal situation where the transformer 1 is damaged. This is because it tends to flow towards the 1st side.

The on-off valve 5 is electrically connected in series with the heat detector.

The transformer 1 is provided with a discharge pipe 6, the end of which is connected to a storage tank 7, and a valve 8 is provided in the middle of the discharge pipe 6.

The valve 8 is associated with a mechanical mechanism 9a that opens and closes it, and when the mechanical mechanism 9a is operated, the valve 8 automatically opens.

A solenoid valve 9 is connected to the on-off valve 5 and a heat detector in the transformer 1, which are connected in series.

The electromagnetic valves 9 are connected so that the mechanical mechanism 9a operates only when both actuate. When a fire occurs in the transformer 1 and both the heat detector and the on-off valve 5 operate, the solenoid valve 9 operates, but the pipe 4 does not cause a fire.
If only the internal pressure changes, the solenoid valve 9 will not operate.

A pipe 11 connects the discharge pipe 6 with a diaphragm 10 between the transformer 1 and the valve 8.

A rod 12 is provided at the tip of the diaphragm 10. When the valve 8 opens and the pressure inside the diaphragm 10 decreases, the diaphragm 10 contracts to the right like a piston, as shown in Figure 2, and the rod 12 also moves in the same direction. The mechanical mechanism 12a operates to open the valve of the high-pressure gas cylinder 13, and the filled gas is ejected from its head. A pipe 14 is communicated from the bottom of the transformer 1 and is directly connected to the head of a high pressure gas cylinder 13.

A pressure expansion chamber 15 is provided in the middle of the pipe 14. In other drawings, reference numeral 16 denotes a vip branched from the middle of the discharge pipe 6, and a safety valve 18 is provided in a bulge 17 at the tip thereof which is to become a valve chamber. 19 and 20 are plumes,
The weight 19 operates when the electromagnetic valve 9 operates and the mechanical mechanism 9a operates, and the weight 20 operates when the rod 12 moves to the left in the figure and the mechanical mechanism 12a operates. They move downward together due to their gravity, and actuate the switch 21 below, making it possible to issue a signal that these have worked.

If the transformer 1 explodes due to the above-mentioned cause and a fire occurs, the heat detector instantly detects this.

At this time, since the transformer 1 has already been damaged, the oil in the pipe 4 tries to flow toward the transformer 1, unlike in normal cases, but the on-off valve 5 works to prevent it. This prevents fuel from being poured onto the flames and causing a conflagration. When the heat detector and the on-off valve 5 work simultaneously, the solenoid valve 9 is activated, the valve 8 is opened, and the pipes 6 and 11 are activated.
, the oil in the diaphragm 10 is a predetermined amount, but the oil is in the reservoir tank 7.
As the pressure inside the diaphragm 10 decreases, the diaphragm 10 contracts together with the rod 12 to the right in the figure, and the rod 12 also moves in the same direction, causing the associated mechanical mechanism 12a to operate.

Therefore, high-pressure gas blows out from the high-pressure gas cylinder 13, and as it passes through the pressure expansion chamber 15, it is brought to a predetermined pressure, enters the transformer 1 from the pipe 14, becomes bubbles, and rises. The oil in the transformer 1 is appropriately stirred, and the cold oil at the bottom moves upwards, and the temperature near the oil surface can be lowered to below the ignition point, making it possible to extinguish the fire.

Note that the reason why a predetermined amount of oil in the transformer 1 is discharged is because the upper wall and insulator bushings of the transformer 1 are blown off due to an explosion, and the oil in the transformer 1 is discharged due to the above stirring. This is to prevent a major accident from occurring by preventing this from overflowing from the opening. Even if the non-flammable gas ejected from the high-pressure gas cylinder 13 is supplied at high pressure into the transformer 1 through the oil layer therein, reliable fire extinguishment will not be achieved. It is preferable to adjust the pressure to a level that is suitable for extinguishing a fire, that is, a pressure that is sufficient to stir the oil in the transformer 1.

Nitrogen gas can be used as the nonflammable gas.

Because nitrogen gas has the property of strongly cooling things,
When this is used, the oil in the transformer 1 can be cooled as much as possible and the fire extinguishing effect can be enhanced. When the safety valve 18 is in the state shown in FIG. 2, air flows into the pipe 6 through the pipe 16, and a predetermined amount of oil therein can be discharged into the storage tank 7.

Unlike the illustrated example, when the discharge pipe 6 is provided at the upper part of the side wall of the transformer 1, it is not necessary to provide the pipe 16 and the safety valve 18.

According to the present invention, nonflammable gas is spouted from the high-pressure gas pump only when a fire accident occurs in the transformer and both the on-off valve and the heat detector are activated. This has the effect of preventing the fire extinguisher from erroneously operating.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the fire extinguishing system for a transformer according to the present invention, with FIG. 1 showing the device before operation, and FIG. 2 showing the device after a fire has broken out in the transformer and the device is activated. 1... Transformer, 2... Coil, 3... Auxiliary tank, 4, 6, 11, 14... Pipe, 5... On-off valve,
7...Storage tank, 8...Valve, 9...Solenoid valve, 1
0... Diaphragm, 12... Rod, 13... High pressure gas cylinder 15... Pressure expansion chamber.

Claims (1)

[Claims] 1 A discharge pipe 6 is provided in the transformer 1, and a diaphragm 10 is provided in communication with the discharge pipe 6.
A high-pressure gas cylinder 13 whose valve is opened by the operation of the diaphragm 10 is connected to the diaphragm 10, and an on-off valve 5 which acts to cut off communication between the transformer 1 and the auxiliary tank 3 and a heat pump provided inside the transformer 1 are connected to The discharge pipe 6 is electrically connected to the detector, and the discharge pipe 6 is opened only when the on-off valve 5 and the heat detector are both activated.
When the oil in the transformer 1 flows out and operates the diaphragm 10, when the diaphragm 10 operates,
A fire extinguishing system for a transformer, characterized in that nonflammable gas can be spouted into the oil of the transformer 1 from the high-pressure gas cylinder 13 by its operation.