JP4892506B2 - Fire extinguishing equipment for oil-filled transformers - Google Patents

Description

  The present invention relates to a fire extinguishing apparatus for oil-filled substation equipment, and in particular, a structure in which an oil-filled transformer equipment and other equipment are electrically connected by a bushing and a connecting conductor provided in the oil-filled transformer equipment and surrounded by a protective duct. The present invention relates to a fire extinguishing device for oil-filled transformers.

  Oil-filled transformers, for example oil-filled transformers, are installed in the vicinity of other devices such as control panels, and between them, copper plates, cables, etc. are connected to terminals supported by bushings etc. provided on oil-filled transformers It is used by making an electrical connection using a conductor.

  Normally, oil-filled transformers have a structure in which a large amount of mineral oil as an insulating oil is sealed in the tank. There is concern that a fire will occur. For this reason, in place of mineral oil, flame retardant silicone oil is also used as insulating oil for oil-filled transformers.

  However, it is well known that even if it is a silicone oil as well as a mineral oil used as an insulating oil, it may ignite even at room temperature if it is mist-like from a damaged part such as a pipe and blown into the atmosphere. ing. For this reason, oil-filled transformers need to consider fire fighting measures such as providing fire extinguishing devices.

  In the case of a conventional oil-filled transformer, as a fire countermeasure, a fire extinguisher is fixed to the outer surface of the oil-filled transformer, and a discharge port provided at the end of the pipe connected to the fire extinguisher is installed on the entire surface above the oil-filled transformer. In the event of a fire, an inert gas is injected from the discharge port toward the oil-filled transformer (see Patent Document 1).

  In addition, in a soundproof tank for noise prevention or a structure in which an oil-filled transformer is arranged in a building, a gas fire extinguishing device is connected to the inside, and in the event of a fire, a fire extinguishing gas is jetted from the gas fire extinguishing device to the entire interior. It has also been proposed to fill the interior with a fire extinguishing gas (see Patent Document 2).

  Also, when a fire occurs in a duct such as a ventilation duct or a transport duct in a factory, the air flow flowing in the duct is stopped and a large amount of fire extinguishing gas or foam is injected into the duct, or the air flow in the duct is reduced. It is also known to provide a gas discharge nozzle that can discharge without stopping (see Patent Document 3).

JP 2005-251826 A JP 2004-111858 A JP-A-62-197075

  However, when a fire extinguisher is provided outside the oil-filled transformer as in Patent Document 1, a large oil-filled transformer is provided with a large number of discharge ports and fire extinguishers, even if the emphasis is placed on easily damaged parts. There is a drawback that must be done.

  Moreover, when providing the gas fire extinguishing apparatus connected with the inside of the building etc. which installed the large oil-filled transformer like patent document 2, in order to fill up a large internal space part quickly with fire extinguishing gas, a gas fire extinguishing apparatus is There is a problem that a large jetting capacity is required and the entire equipment cannot be economically installed in the oil-filled transformer.

An object of the present invention is to specify a location where an oil-filled transformer and other equipment are connected to a portion where there is a risk of fire occurrence, and supply a fire extinguisher made of an inert gas only to this specific portion, Thus, an object of the present invention is to provide a fire extinguishing device for oil-filled transformer equipment that can be manufactured economically with a simple structure.

The fire-extinguishing device for oil-filled substation equipment according to the present invention electrically connects the oil-filled transformer equipment and other equipment installed in the vicinity thereof by using a bushing and a connection conductor, and the connection portion serves as a protective duct. In the oil-filled substation equipment enclosed , the protective duct is provided with a fire detector and a duct pressure release means , an inert gas extinguishing agent storage unit is installed in the vicinity of the protective duct, and the protective duct is installed. At least one ejection head for ejecting inert gas is attached to the duct for use, and the inert gas extinguishing agent storage unit and the ejection head are connected by a pipe, and the inert gas extinguishing agent storage unit is connected to the oil-filled transformer. Operates based on either a predetermined output signal value of the oil temperature gauge or pressure gauge of the device or an operation signal of the pressure relief device, or when a plurality of combinations of these signals reach a predetermined state With that, the inert gas fire extinguisher storage unit in the sensing output of the fire detector is characterized by being configured such that responsive.

  If a fire extinguishing device for oil-filled substation equipment is configured as in the present invention, a place where there is a risk of fire in the oil-filled substation equipment is specified locally only at the connection part with the equipment to reduce the fire extinguishing target range. However, since the inert gas is supplied only to the specific part based on the output signal of the monitoring panel of the oil-filled transformer, it can be manufactured economically with a simple structure.

In the present invention, another device is installed in the vicinity of the oil-filled substation device. The oil-filled substation equipment and other equipment are electrically connected by using bushings and connecting conductors, and this connecting portion is surrounded by a protective duct. The protective duct is provided with a fire detector and duct pressure relief means, and an inert gas extinguishing agent storage unit is installed in the vicinity of the protective duct, and is attached to the protective duct to eject at least one of the inert gas extinguishing agent. Two ejection heads are connected to an inert gas extinguishing agent storage unit by piping. The inert gas extinguishing agent storage unit is based on either a predetermined output signal value of an oil thermometer or pressure gauge of an oil-filled transformer or an operation signal of a pressure relief device, or a combination of these signals. configuration but with operation upon reaching a state in which a predetermined, as the inert gas fire extinguisher storage unit in the sensing output of the fire detector is so responsive to inject inert gas extinguishing agent from the spray head is doing.

  Hereinafter, the fire-extinguishing apparatus for oil-filled transformers according to the present invention will be described with reference to the embodiment shown in FIG. In the embodiment of FIG. 1, a control panel 2, which is another device, is installed in the vicinity of the oil-filled transformer 1 installed on the site of a power plant or substation. The oil-filled transformer 1 and the control panel 2 are electrically connected by a bushing 3 of each phase on the low voltage side and a connection conductor 4 such as a copper plate or a cable.

  For the connection portion between the bushing 3 and the connection conductor 4, for example, a protective duct 5 having a rectangular cross section using a metal plate or a flame-retardant resin is used, and the bushings 3 for three phases are surrounded at once. So, it is a protected area. As a result, the protective section covered with the protective duct 5 is limited to disaster prevention locations that may cause a fire or the like with the oil-filled transformer 1, so that disaster prevention measures can be easily performed.

The vicinity of the protective duct 5, is installed an inert gas fire extinguishing agent storage unit 10 for storing the inert gas extinguishing agents in CO ₂ gas and the like for the limited protection compartment. The inert gas extinguishing agent storage unit 10 is connected to at least one jetting head 11 attached to the protective duct 5 by a pipe 14 using, for example, a copper pipe, and the inert gas extinguishing agent is placed in a protective compartment when described later. Is ejected into the protective duct 5.

An alarm device such as a rotating lamp 15 is attached to the control panel 2 or the vicinity thereof, and an alarm device such as a loudspeaker 16 is installed at an appropriate place in the site. As a result, when the inert gas extinguishing agent storage unit 10 is activated and the inert gas extinguishing agent is ejected, the monitoring unit 2A in the control panel 2 works to issue an alarm, and also notifies the management room 17 To do.

As an activation means for activating the inert gas extinguishing agent storage unit 10 and ejecting the inert gas extinguishing agent from the ejection head 11, an oil thermometer for measuring the oil temperature or a pressure gauge for detecting the internal gas pressure is used. Each output signal, as well as the output signal when the pressure relief device provided in the oil-filled transformer 1 is operated, is led from the terminal box 8 to the monitoring unit 2A of the control panel 2 through the signal line 9 and monitored and utilized.

The terminal box 8 is provided below the side surface of the oil-filled transformer 1, and the output signal values of the oil thermometer for measuring the internal oil temperature and the pressure gauge for detecting the internal gas pressure, and the internal pressure rapidly increased. It is provided to monitor the operating signal of the pressure relief device that sometimes operates. Further, since a combustible cable is used for the terminal box 8, safety can be further improved by providing an injection head in the terminal box 8 and injecting an inert gas extinguishing agent.

When an abnormality occurs inside the oil-filled transformer 1, the output values of the oil thermometer and pressure gauge change rapidly and increase, and when the tank internal pressure of the oil-filled transformer 1 increases rapidly, The provided pressure relief device performs the internal pressure release operation. In the present invention, these are utilized to activate the inert gas extinguishing agent storage unit 10.

More specifically, in the monitoring unit 2A, the signal values of the oil thermometer and the pressure gauge rise or reach each predetermined output signal value, or the operation signal of the pressure release device, or these signals When a plurality of combinations reach a predetermined state, it is determined that the risk of occurrence of a disaster is extremely large at that time. Based on this determination, the monitoring unit 2A activates the inert gas extinguishing agent storage unit 10 and ejects the inert gas extinguishing agent from the ejection head 11, thereby preventing the occurrence of fire.

In this embodiment, a fire detector 13 is also provided in the protective duct 5 which is a protective section. As a matter of course, when the fire detector 13 detects a fire in the protective duct 5, the monitoring unit 2A immediately operates and similarly activates the inert gas extinguisher storage unit 10 to activate the inert gas extinguisher . Erupt. As a power source for the monitoring unit 2A and the inert gas extinguishing agent storage unit 10, a normal or emergency power source 2B of the switchboard 1 is used.

The protective duct 5 is provided with duct pressure release means 12 such as a pressure-reducing valve, which is operated when the internal pressure rises above a certain value. Thereby, when the inert gas fire extinguisher is ejected from the ejection head 11 into the disaster prevention section, it is possible to prevent the protective duct 5 and the components of each device from being damaged due to a sudden increase in internal pressure.

Further, when the inert gas extinguishing agent is an inert gas extinguishing agent such as CO ₂ gas, after the operation of the inert gas extinguishing agent storage unit 10, the duct pressure release means 12 is operated to operate the protective duct 5. If it is discharged from the inside, it is possible to promptly and safely perform the internal inspection work by the worker.

In the example of FIG. 1, a high-pressure side bushing 6 for each phase is provided on the side opposite to the bushing 3, and the bushing 6 is connected to other equipment using a cable head (not shown) or the like. It is. For this reason, the connection part of each phase is also surrounded by the protective duct 7, the injection head 11 is attached to the protective duct 7 to form a disaster prevention zone, and connected to the inert gas extinguishing agent storage unit 10 side by the pipe 14. As a result, disaster prevention measures can be easily performed as described above.

  In the above embodiment, the fire extinguishing device for oil-filled transformers according to the present invention has been described using an oil-filled transformer, but the same effect can be achieved even when applied to an oil-filled reactor, an oil-filled capacitor, or the like. Obviously we can do it.

It is the schematic which shows the fire extinguisher of the oil-filled transformation apparatus which is an Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Oil-filled transformer, 2 ... Control panel, 3, 6 ... Bushing, 4 ... Connection conductor, 5, 7 ... Protection duct, 10 ... Inert gas fire extinguishing agent storage unit, 11 ... Jet head, 12 ... Duct Pressure release means, 13 ... fire detector, 14 ... piping.

Claims (1)

Between other devices to be installed with the oil-filled transformer apparatus in this vicinity, as well as electrically connected with the bushing and the connecting conductors, the connecting point in the oil-filled transformer apparatus which surrounds at protection duct, the protection The duct for fire is provided with a fire detector and a duct pressure releasing means , an inert gas extinguishing agent storage unit is installed in the vicinity of the protective duct, and at least one jet for jetting inert gas to the protective duct A head is attached, and the inert gas extinguishing agent storage unit and the ejection head are connected by piping, and the inert gas extinguishing agent storage unit is provided with a predetermined output of an oil thermometer or pressure gauge of the oil-filled transformer. signal value, or based on any of the operation signals of the relief device, or with a plurality of combinations of these signals operate upon reaching the predetermined condition, the sensing output of the fire detector The inert gas fire extinguisher storage unit Te extinguishing device for an oil-filled transformer apparatus which is characterized by being configured such that responsive.

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