KR20130035788A

KR20130035788A - Fire extinguisher for electric power supply panels

Info

Publication number: KR20130035788A
Application number: KR1020110100326A
Authority: KR
Inventors: 윤병돈; 최영관
Original assignee: 주식회사 에스알
Priority date: 2011-09-30
Filing date: 2011-09-30
Publication date: 2013-04-09

Abstract

PURPOSE: A fire extinguishing apparatus for an electric supply panel is provided to discharge a fire extinguishing agent from a fire extinguishing container, thereby detecting and extinguishing fire without supplying electric power when extinguishing the fire. CONSTITUTION: A fire extinguishing apparatus for an electric supply panel includes an ignition point sensing tube(10) and a fire extinguisher(20). The ignition point sensing tube is installed throughout the front side of a panel. The tube automatically detects fire inside the panel, and is ruptured. The fire extinguisher is installed on the rear side of the panel, and is connected to the tube. The fire extinguisher stores a fire extinguishing agent inside. When the tube is ruptured, the fire extinguisher discharges the agent to a fire protection zone. [Reference numerals] (AA) Transformer;

Description

Fire extinguisher for electric power supply panels}

The present invention relates to a fire extinguishing device for an electric supply panel, and in particular, when a fire occurs in a power supply panel such as a switchgear, a fire extinguishing agent in a fire extinguishing container installed at a rear side of the panel is melted by discharging gas from the fire detection tube installed at the front of the panel. The present invention relates to a fire extinguishing device for an electric supply panel capable of detecting and extinguishing a fire without supplying electric power when it is released to extinguish a fire.

Automatic fire extinguishing equipment is used as a fire protection facility for buildings.

However, the heat detector or smoke detector used in the existing automatic fire extinguishing device is insufficient to extinguish the fire due to a malfunction or malfunction when the automatic fire extinguishing device is unstable or the power is cut off.

In addition, since the existing fire extinguisher detector and pipes and nozzles of the fire extinguisher for the fire extinguishing system exist separately, it was not effective in extinguishing the fire in a narrow space such as a switchgear which is an electrical supply facility.

In addition, there was a problem such as equipment damage and waste extinguishing agent by the extinguishing agent sprayed from the fire extinguisher during the expansion of the fire.

Furthermore, the National Fire Protection Code (NFSC) in Korea and the National Fire Protection Association (NFPA) in the United States mandate the installation of fire extinguishers by building use and area, but there are no legal restrictions on electric distribution panels. .

In order to prevent the early evolution of electrical fires and the spread of fires in K-water, K-water is specially designed for high-pressure water distribution panels (ALTS, LBS) in hydro power plants and water works in K-water. In case of facilities with ACB, reactor starter, rectification base and accident risk (CT, PT, coil), a separate automatic fire extinguishing device for electricity supply panel is installed and operated. The individual automatic fire extinguishing device is composed of a fire extinguisher, a detector and a control box. When the temperature rises above 70 ° C in the event of a fire, the constant temperature spot type heat sensor operates to control the parking short-term in the control box. It receives fire signal from MAIN PCB) and transmits electric signal to fire extinguisher motor drive to release fire extinguishing agent to extinguish fire. The alarm system is composed of alarm redundancy with alarm through self detection system and MMI (man machine interface) screen. Therefore, the existing fire extinguishing system for the electrical supply panel is determined whether the fire extinguisher valve is opened or closed by the electric signal by the fire judgment of the detector, there is a risk of large accident due to signal system error.

As described above, in order to improve the problem of the sensor operated by the power supply and the problem of the existing automatic fire extinguishing device operating in a large space, the fire extinguishing device using the flash point detection tube capable of early detection and early evolution of the fire at the flash point Development was needed, and such flashpoint sensing tubes continue to evolve.

On the other hand, there is a conventional technology using a fire detection tube, such as the Republic of Korea Patent Publication 2004-27534 (linear fire detection tube and automatic power supply automatic fire extinguishing system) and the Republic of Korea Patent Publication 2010-33145 (fire detection tube attached automatic fire extinguishing device). .

Looking at the overall configuration of the non-powered automatic fire extinguishing system using a linear fire detection tube disclosed in the Republic of Korea Patent Publication No. 2004-27534, as shown in FIG. 1, the non-powered automatic fire extinguisher 101 and the linear fire detection tube 103 connected thereto are protected. When fire occurs in the equipment 102, the fire extinguishing agent is released by the fire 110, the linear fire detection tube 103 is ruptured by the heat 110 is configured to directly extinguish. The low pressure output signal 105 by the gas discharge is transmitted to the wired / wireless digital repeater 106 and the monitoring equipment 109 through the data communication (RS-485 / 422) 107 and the wireless relay signal antenna 108. It is configured to promptly monitor and extinguish a fire by transmitting a signal.

In addition, the linear fire detection tube 201 in the linear fire detection tube and the automatic fire extinguisher shown in FIG. 2 has a material property having a discharge resistance and flexibility and a sensitivity to react at 10 to 15 bar, 100 ° C to 110 ° C. When a heat source comes into contact with the tube, the tube begins to melt and burst at the hottest spot. In order to maintain a constant pressure, the end 202 of the tube is composed of an end adapter (or welding), and the signal output device 204 due to low pressure during gas discharge is used as an input signal of an alarm system or a digital repeater for monitoring. The digestive cylinder 205 is filled with nitrogen 206 and extinguishing agent 207 which are pressurized filling gases. The extinguishing agent 207 may use various extinguishing agents including FM-200, dry chemical, CO 2, water, and foam, and have practical extinguishing at low cost.

In the Republic of Korea Patent Publication No. 2010-33145, as shown in FIG. 3, the check valve 20 for preventing the mixing of the pressurized gas such as nitrogen and the extinguishing agent has a extinguishing agent inside the body 21 of the check valve. Form a cylindrical tube that can pass through, if there is no check valve 20, the fire detection tube 30 is mixed with a fire extinguishing agent and a pressurized gas such as nitrogen of a certain pressure and air is detected by the fire detection tube (30) The temperature is not constant and causes the corrosion of the fire detection tube 30 due to the mixing of the extinguishing agent in the fire extinguishing vessel (6), etc., but the fire detection tube (30) due to the check valve (20) Since only pressurized gas is charged, it maintains constant pressure and sensing temperature and prevents corrosion.

Nevertheless, in the case of a conventional fire extinguishing device for an electric supply panel, whether or not the fire extinguisher valve is opened or closed by an electric signal based on a fire judgment of a fire detector, there is an inherent risk of a large accident due to a signal system error.

In addition, in the case of a fire extinguishing device for a conventional electric supply panel, the fire detection tube described above is not applied. It was not possible to reduce the waste of fire surveillance personnel by the Unwanted Alram.

That is, in the case of a fire extinguishing device for a conventional electric supply panel, when a fire occurs due to the above-described electrical signal error, a fire alarm may fail, and an extinguishment of the fire due to a malfunction or malfunction of the fire extinguishing device may fail. If the separation distance between electrical installations such as substations, distribution stations, etc. is considerable, even the conventional automatic fire extinguishing device has increased the number of fire monitoring personnel due to non-fire reporting.

In addition, since a fire extinguisher suitable for the size and volume of the switchgear was not used, a proper amount of extinguishing agent could not be released by the fire detection operation of the fire detection tube.

1. Republic of Korea Patent Publication 2004-27534 (linear fire detection tube and non-power automatic fire extinguishing system). 2. Republic of Korea Patent Publication 2010-33145 (Fire detection tube attached automatic fire extinguishing device).

Firetrace USA LLC (2002), "firetrace automatic fire suppression system design, installation, operation and maintenance manual". Choi-Young-Kwan, Yoon Byeong-Don, Kim Eung-Kwon, Shin Myong-Chul, "A Study on the Analysis of the Tube for Detecting Ignition Point", Autumn Annual Conference of KIFSE, pp. 341-344, 2010. Choi-Young-Kwan, Yoon Byeong-Don, Kim Eung-Kwon, Shin Myong-Chul, "A Study on the Development of an Automatic Fire Extinguisher for Power Sub-station systems", Autumn Annual Conference of KIFSE, pp. 345-348, 2010.

The problem to be solved by the present invention is to install a fire detection tube over the entire front surface of the panel for the electrical supply panel, such as switchgear, when the fire detection tube is melted by the fire to extinguish the fire by extinguishing agent from the fire extinguisher installed in the rear panel It is an object of the present invention to provide a fire extinguishing device for an electrical supply panel that can prevent the failure of fire suppression due to an electrical signal system error, since there is no fire detector operating by an electric signal.

In addition, the present invention is to install a fire detection tube on the front of the panel for the electrical supply panel, such as switchboard, when the fire detection tube is melted by the fire to extinguish the fire by extinguishing agent from the fire extinguisher installed on the back of the panel, Provides a fire extinguishing device for an electrical supply panel that can reduce the waste of fire monitoring personnel by unwanted alrams indicating that a fire has occurred due to the operation of an automated fire detection system due to factors other than heat, smoke, or flame (flame). For the purpose.

In addition, the present invention is to install the above-described fire detection tube in the power supply panel such as switchgear, but using a fire extinguisher according to the size or volume of the power supply panel, the appropriate amount of extinguishing agent is released by the fire detection operation of the fire detection tube. It is an object of the present invention to provide a fire extinguishing device for an electrical supply panel.

The present invention in the fire extinguishing device for an electrical supply panel in order to achieve the problem to be solved by the above-described invention,

An ignition point detection tube which is installed over the entire panel of the front of the electricity supply panel and automatically detects and ruptures a fire in the electricity supply panel; And

It is installed on the rear of the electrical supply panel is connected to the flash point detection tube, and provides an extinguishing device for an electrical supply panel including a fire extinguisher to discharge the fire extinguishing agent stored in the protective area when the bursting of the flash point detection tube.

Preferably, the amount of fire extinguishing agent is calculated by volume [㎥] × required gas volume per kilogram [kg / ㎥] of the protective area, and the pressure correction coefficient according to the altitude is applied in the case of the electricity supply panel installed in the area where the altitude is high. It is characterized by the calculation.

Preferably, the extinguishing agent amount is calculated in consideration of the leakage of the extinguishing agent through an opening including a cable connector of the electric supply panel.

Preferably, the amount of extinguishing agent assumes that no extinguishing agent leaks through the opening.

Where W is the extinguishing agent volume, V is the protective area volume, S is the specific volume, C is the extinguishing agent concentration, and Y is the atmospheric pressure correction coefficient.

According to the present invention, there is no fire detector operating by an electric signal by installing a fire detection tube throughout the panel for an electric supply panel such as a distribution panel, thereby preventing fire suppression failure due to an electrical signal system error.

In addition, the present invention is to install a fire detection tube on the panel for the electrical supply panel such as switchboards, the fire retardation equipment to operate by the factors other than heat, smoke or flame (flame) caused by the fire to tell that the fire occurred Unwanted Alram can reduce the waste of fire monitoring personnel.

In addition, the present invention is to install the above-described fire detection tube in the power supply panel such as switchgear, but using a fire extinguisher according to the size or volume of the power supply panel, the appropriate amount of extinguishing agent is released by the fire detection operation of the fire detection tube. You can do that.

1 is a block diagram showing a conventional linear fire detection tube and a non-powered automatic fire extinguishing system.
2 is a block diagram showing a fire extinguishing device used in FIG.
Figure 3 is a block diagram showing a conventional fire detection tube attached automatic fire extinguishing device.
Figure 4 is a schematic diagram of a fire extinguishing device for an electrical supply panel having a fire extinguishing tube and a fire extinguisher installed in the electrical supply panel of the switchgear according to the present invention.
5 and 6 are photographs of the electric supply panel to which the fire extinguishing device for the electric supply panel of FIG. 4 is applied.

Hereinafter, the configuration and operation of a fire extinguishing device for an electric supply panel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figures 4 to 6, the fire extinguishing device for an electric supply panel of the present invention is installed in a protection zone in the electric supply panel 100 and ruptured above the detection temperature 10 and the flash point detection tube The fire extinguisher 20 which supplies a fire extinguishing agent to 10 is included.

The firing point detection tube 10 is installed over the entire panel of the front of the electricity supply panel 100 is broken by automatically detecting the fire in the electricity supply panel 100, the fire extinguisher 20 is the electricity supply panel It is installed on the rear of the 100 is connected to the flash point detection tube 10, and discharges the extinguishing agent stored in the protection zone when the burst of the flash point detection tube (10).

The ignition point detection tube 10 of the present invention is an advanced polymer tuk material capable of emitting gas in response to heat at a sensing temperature of 100 ° C. to 110 ° C., and the fire extinguisher 20 is an electrical supply panel suitable for a clean extinguishing agent (HFC-227ea). 100 is connected to a flash point detection tube (10).

In addition, the fire extinguishing device for the power supply panel of the switchgear of the present invention is an individual fire extinguishing device for the electric supply panel as an example, as shown in Figure 7, the fire detector 30, PLC RTU (40), and the wireless alarm ( 50) can be wirelessly transmitted to the MMI screen to the mobile phone 60, such as a smartphone.

In particular, the present invention shows the gas leakage and breakage phenomenon for the curvature deterioration when the installation of the flash point detection tube, giving the flame retardancy of the modifier to the polymer sensing tube 10 having a high function to improve the deterioration characteristics and extend the service life It was. The polymer sensing tube 10 of the present invention operates at 100 ° C.-110 ° C., and the installation effective length is 2.5-20M, and its outer diameter and inner diameter are 6Φ and 4Φ, respectively.

Fire extinguisher 20 applied to the fire extinguishing device for the electrical supply panel of the switchgear of the present invention must maintain a constant pressure for releasing the extinguishing agent at an appropriate temperature, and must release an appropriate amount of extinguishing agent for extinguishing.

This functional fire extinguisher 20 of the present invention was selected HFC-227ea among the clean fire extinguishing agent to derive a formula for calculating the extinguishing agent.

HFC-227ea, a fire extinguishing agent of a ignition point detection tube fire extinguishing apparatus of the present invention, is used worldwide and is sold under the KFI certification of Korea Fire Industry and Technology Institute as a fire extinguishing agent certified by international certification. Each gas fire extinguishing agent was summarized and compared. Table 1 below is a comparison table of fire extinguishing agents.

drugs

price
digestion
ability

Environmental impact
Filling pressure per 1kg
Vessel
ratio
apply
HFC-227ea
100%
Great
Environmentally friendly

25.3 kg / cm (low pressure)
100%
Most reasonable
Halon
75%
Great
Ozone Depletion

42 kg / cm (high pressure)
60%
Production stops since 2011
CO2
50%
Good
Harmless
Suffocation

58 kg / cm (high pressure)
400%
Small space not applicable

The characteristics of the applied extinguishing agent HFC-227ea are as follows.

(1) Features

① It is adopted by NFPA, SNAP program and certified by UL and FM.

② The filling pressure is low, medium, or high pressure, but in Korea, the filling pressure is medium pressure at room temperature, but it was first recognized as KFI, but in order to solve the shortcomings of low pressure, it is a pressurized system that uses a nitrogen container outside the chemical storage container. (Product name: Piston Flow System; PFS) has been additionally approved by KFI.

③ The price of drugs is the highest compared to other drugs.

(2) KFI Certification

① PFS type fire extinguishing system uses one bottle of nitrogen container for each bottle and the filling pressure of the container is 2.53MPa (25.3kg / ㎠) at 20 ℃.

② Storage containers 59ℓ (standard charge 50kg), 89ℓ (standard charge 75kg). There are three types of 115ℓ (standard charge 100kg). 40 is used.

(3) Environmental Index: UNEP Data Sheet

Environmental standards and extinguishing capacity are the best among HFC fire extinguishing agents.

In the National Fire Protection Association (NFPA) and the National Fire Safety Code (NFSC), NFPA 2001 (Clean Agent) method of calculating the clean extinguishing agent amount is based on the table and the formula, and thus NFSC 107A The same result as the method according to the fire safety standard of the chemical fire extinguishing system can be obtained. However, in NFPA 2001, there is an air pressure correction coefficient (Y) according to the altitude, and the final extinguishing agent amount is calculated by multiplying the result of the clean extinguishing drug quantity calculated by a table or a formula with the air pressure correction coefficient.

However, the switchboard automatic fire extinguishing system does not have to comply with the NFSC 107A (Fire Safety Standards for Clean Fire Extinguishing Systems) as a self-contained facility without installation regulations. Therefore, in order to calculate the clean extinguishing agent amount (HFC-227ea) for the individual automatic fire extinguishing device for switchboard and motor starter, it is compared with general estimation method and NFPA, NFSC to calculate the optimal extinguishing agent amount for application to the developed fire extinguisher. Duly derived.

In general, in determining the amount of extinguishing agent for the protective volume of the electrical panel, it is calculated as the sum of the amount of extinguishing agent in the volume of the protective area and the leakage of the opening. In calculating the amount of extinguishing agent, the amount of leakage to the opening should be considered as an addition amount, and it is preferable from the viewpoint of safety to add the amount of medicine in consideration of the concentration duration time and the amount of leakage required by the protection area. In the case of HFC-227ea, 4.0kg / m2 is generally applied for the clean fire extinguishing agent's fire extinguishing system, but there is no basis for the addition amount per opening area. Consideration should be given to the application and the amount of addition.

NFSC does not provide a separate standard for the addition of openings in clean fire extinguishing equipment, such as halon 1301 or CO ₂ . In the case of clean fire extinguishing facilities, the concept that the opening must be automatically closed can be considered as a principle. In order to accurately estimate the leakage amount, the door fan test should be carried out to accurately measure the leakage amount of the opening.However, in the case of halogen compounds, chemical extinguishing mainly due to suppression and extinguishment has the characteristic of emitting a short time at low concentration. For example, the dosage calculations include margins for normal leakage from the closed protective space (NFPA 2001 2008 edition 5.5.1.1), so the amount lost is negligible and can therefore be regarded as a margin of error.

In addition, NFPA is installed in the protection area or the closest to the protection area for storage containers to shorten the transport distance for the extinguishing agent emission, so that the drug is rapidly spread in the protection area, and in all domestic gas-based fire extinguishing facilities It is approved to install storage containers inside the protection area. As such, in the case of an individual automatic fire extinguishing device attached to a small space protection area called an electric panel, it is desirable not to overdesign by separately calculating the area of the opening. In addition, since the power equipment is installed inside the electrical panel, the protective volume for actual fire extinguishing is inevitably smaller than the panel volume. Especially in the case of the high pressure motor starting panel, the size of the power equipment occupies most of the panel, which is sufficient for the amount of extinguishing agent. It can be said that you have room.

Therefore, the amount of clean fire extinguishing agent of the automatic switchgear of the switchgear is calculated as "volume [m 3] of the protective area × required gas per volume [kg / ㎥]," and then, in the case of an electrical panel installed in an area having high altitude above sea level. By applying the air pressure correction coefficient according to the altitude, the following equation can be obtained.

On the assumption that there is no spill of extinguishing agent from inside the electrical panel (in the case of no spillage),

Here, if Equation 2 below is substituted into Equation 1, Equation 3 is obtained.

Thus, the following equation (4) is obtained.

The pressure correction coefficient Y is applied to Equation 4 to obtain Equation 5, which is the extinguishing agent calculation formula of the present invention.

This formula calculates the minimum extinguishing agent amount for a small space electrical panel applying the pressure correction coefficient (Y) according to the height and the consideration of the size and opening of the electrical panel.

The fire extinguisher was designed in consideration of the calculated extinguishing agent amount.

Fire extinguishing device for an electric supply panel of the present invention uses a clean fire extinguishing agent FC HFC-227ea (FM-200) as the extinguishing gas, the instrument, the main body, A fire extinguisher including a valve body, a valve shaft, and a suction pipe is provided, and a fire extinguisher having such a structure has the same structure as an existing fire extinguisher except for the calculated amount of extinguishing agent, and thus a detailed description thereof will be omitted.

The fire extinguishing device for a non-powered electric supply panel of the present invention satisfies the following performance.

(1) The firing point detection automatic fire discharge tube (Detection Discharge Tube) applied to the present invention bursts within 15 seconds when exposed to a temperature of 100 ° C. or higher, and immediately releases fire extinguishing gas.

(2) The applied extinguishing agent (HFC-227ea) is a clean extinguishing agent, which is harmless to the environment and is an inert gas, not a liquid or powder. In addition, it is electrically non-conductive and does not leave residues from vaporization when extinguishing, so there is no impact on human body, electrical equipment, power supply (including rectifier, UPS) and global environmental damage during firefighting.

(3) The fire extinguishing cylinder which is the chemical storage container (Cylinder) does not rupture at the expansion pressure of the extinguishing agent (the expansion pressure of HFC-227ea is about 273psig at 60 ℃).

(4) Pressure gauge can accurately manage the pressure inside the fire extinguishing system.

Currently, K-water, for example, fire monitoring system of water treatment plant transmits electric signals of heat and smoke through wires to the PLC remote terminal unit (RTU) of the unit process equipment through the detector, where RS485 It transmits a fire signal to the MMI (man machine interface) in the central control room using a communication cable to notify the monitor of the fire alarm. However, if a building's operation is difficult to monitor the MMI screen at each building by each unit process (for example, chemical input ridge, dehydration start, chlorine input ridge, water substation, etc.) like a water treatment plant, it is immediately possible to detect a fire in the electricity supply panel. The watcher is not aware of the situation.

therefore. The fire extinguishing device for an electric supply panel of the present invention may be equipped with a wireless alarm system, and may be constructed as a fire monitoring redundancy system that transmits an MMI screen to a smartphone of an administrator so that constant monitoring during movement and facility inspection is possible. Fire extinguishing device for the electric supply panel of the present invention detects the fire at the ignition point at the beginning of the fire and automatically extinguishs it, thus preventing various damages due to communication error and non-fire report like the conventional fire extinguishing device, and connecting with a smartphone. By allowing fire detection to be doubled, the completeness of fire monitoring and suppression will be increased.

Fire extinguishing device for an electric supply panel of the present invention is to quickly extinguish by automatically detecting a fire generated in the electric supply panel, such as a switchgear in a narrow space, except for a special / high-pressure water distribution panel (ALTS, LBS board) And ACB, reactor starters, commutation bases and fire suppression devices for facilities with accident hazards (CT, PT, coil).

10 ... Flash point detection tube 20 ... Fire extinguishing agent storage / release
30 ... detector 40 ... remote terminal unit
50 ... central control unit 60 ... mobile phone
100 ... Electricity supply panel

Claims

In the fire extinguishing device for the electrical supply panel,
An ignition point detection tube which is installed over the entire panel of the front of the electricity supply panel and automatically detects and ruptures a fire in the electricity supply panel; And
And a fire extinguisher installed at a rear side of the electric supply panel and connected to the flash point detecting tube and discharging the extinguishing agent stored therein into a protective area when the flash point detecting tube is ruptured.

The method of claim 1, wherein the amount of extinguishing agent is calculated by the volume [m 3] × required gas volume per kg [kg / m 3] of the protective area, and the pressure correction according to the altitude in the case of the electricity supply panel installed in an area having high altitude above sea level. Fire extinguishing device for an electrical supply panel, characterized in that calculated by applying a coefficient.

According to claim 1, wherein the extinguishing agent amount is assuming that no extinguishing agent leaks through the opening, the following equation

Wherein W is the amount of extinguishing agent, V is the volume of the protective area, S is the specific volume, C is the extinguishing agent concentration, and Y is the atmospheric pressure correction coefficient.