KR20140108945A - Apparatus and method for protecting cooling device of underground substation - Google Patents

Apparatus and method for protecting cooling device of underground substation Download PDF

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Publication number
KR20140108945A
KR20140108945A KR1020130022865A KR20130022865A KR20140108945A KR 20140108945 A KR20140108945 A KR 20140108945A KR 1020130022865 A KR1020130022865 A KR 1020130022865A KR 20130022865 A KR20130022865 A KR 20130022865A KR 20140108945 A KR20140108945 A KR 20140108945A
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South Korea
Prior art keywords
cooling
motor
current
contact
overcurrent
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KR1020130022865A
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Korean (ko)
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안흡
김인수
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한국전력공사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0827—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors responsive to underload or no-load, e.g. pump-off control circuits for pump motors

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  • Protection Of Generators And Motors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

Based on the current measured by the pump starting circuit included in the transformer cooling means of the underground combined substation, it detects the loss of the cooling function due to the failure of the impeller, faulty or missing of the cooling fan, lack of water in the cooling tower, An apparatus and method for protecting a cooling means of an underground combined substation are proposed. The present invention relates to a cooling device protection device for an underground combined substation, comprising: a low current detection contact which is opened and closed based on a load current input from a pump start circuit of a cooling means and a predetermined set current; A UC sensing unit for determining whether the cooling function of the cooling unit is lost based on whether the low current sensing contact is open or closed; And a power supply unit for switching the motor of the cooling unit when it is determined that the cooling function is lost in the UC sensing unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for protecting a cooling substation in an underground combined substation,

The present invention relates to an apparatus and method for protecting a cooling means of an underground combined substation, and more particularly, to a cooling apparatus for an underground combined substation, which prevents shortening of the life of the transformer due to failure of the cooling apparatus installed in the underground combined substation, Apparatus and method.

The 154kV underground complex substation is a substation installed in the underground of the building for stable power supply. The 154kV underground complex substation is equipped with a gas transformer and a oil-air cooled transformer. Gas and insulating oil are used as insulation medium. At this time, the 154kV underground complex substation cools the insulation medium to prevent heat accidents in the substation.

The gas-cooled type cold-type transformer utilizes a cooling method in which the insulating oil is forcedly cooled by the radiator of the cooling cooler. The gas transformer uses a blower to forcedly circulate the gas to the heat exchanger (for example, main heat exchanger and reserve heat exchanger) . For example, Korean Patent No. 10-0375025 (entitled: Cooling System for Transformer using Refrigerant Vaporization Heat of Refrigeration Cycle) describes a technique for cooling an underground substation by water cooling.

As shown in FIG. 1, an underground substation composed of a gas transformer 10 uses a rotating impeller 30 driven by a gas circulation motor 20 to heat a gas into a heat exchanger 40, Circulate and cool. At this time, piping is provided between the heat exchanger 40 and the cooling tower 70, the cooling water is forcibly circulated by using the impeller 60 rotating by the driving of the water circulation motor 50, (80) and a sprinkling pump (90).

The gas circulation motor 20 and the water circulation motor 50 are supplied with electric power through an electronic overcurrent relay (EOCR). 2, the electronic overcurrent relay 100 includes a relay start contact 110 (hereinafter, referred to as an "A contact") of the motor start circuit and an overcurrent motor stopping device for stopping the motor when the motor is overcurrent An EOCR sensing unit 130 for determining whether an overcurrent is generated on the basis of whether or not the contact 120 (hereinafter referred to as a 'B contact') and the overcurrent motor stopping contact are open or closed, a contact 140 And a power supply unit 150 for shutting off the C contact 140 based on the determination result of the EOCR sensing unit 130 to perform the motor switching.

As shown in FIG. 3, the electronic overcurrent relay 100 is installed in the pump starting circuit 200. The electronic overcurrent relay 100 is installed in the main pump starting circuit 210 and the auxiliary pump starting circuit 220, respectively. The A contact 110 of the electronic overcurrent relay 100 is installed at the lower ends 212 and 222 of the relays 49X1 and 49X2 to supply the driving power for the relays 49X1 and 49X2. The B contact 120 of the electromagnetic overcurrent relay 100 is installed at the lower ends 214 and 224 of the magnets 88M1 and 88M2 to receive a load current. The C contact 140 of the electronic overcurrent relay 100 is connected to the power supply line 230 of the motors M1 and M2 to supply driving power.

The electronic overcurrent relay 100 senses the occurrence of an overcurrent of the motors M1 and M2 based on the load current input through the B contact 120. [ The electronic overcurrent relay 100 stops the main motor M1 when the overcurrent occurs due to the deterioration of the main motor M1 and performs the switching operation to the spare motor M2. When the overcurrent occurs due to deterioration of the spare motor M2, (M2), and performs a switching operation to the main motor (M1). At this time, the electronic overcurrent relay 100 determines that a fault has occurred when the overcurrent occurs in the motor (i.e., the main motor M1 or the spare motor M2) and transmits the fault occurrence signal to the power supply branch (not shown). For example, the C contact 140 supplies operating power to the main motor M1 from a line connected to the MG1. The main motor M1 is driven by the supplied operation power source to drive the impeller. At this time, when an overcurrent due to deterioration occurs in the main motor M1, the magnet 88M1 is excited and the B contact 120 is short-circuited. Thereby, the supply of the operation power to the main motor M1 is interrupted, and the operation is performed by supplying the operation power to the spare motor M2.

However, since the conventional electronic overcurrent relay only performs the switching operation function according to the motor failure due to the overcurrent, when the impeller connected to the motor fails, the circulation of the cooling medium and the cooling water is stopped but the motor is not switched, Thereby causing breakage of the transformer.

In addition, since the conventional electronic overcurrent relay only performs a switching operation function in response to a motor failure due to an overcurrent, even if a belt failure or deviation of the cooling fan occurs, the transfer to the preliminary cooling tower is not performed, There is a problem that occurs.

In addition, the conventional electronic overcurrent relay has a problem that it is difficult for a worker to respond promptly because there is no fault warning alarm function according to the failure of the impeller connected to the motor.

In addition, the conventional electronic overcurrent relay has a problem that the cooling performance is lowered and the transformer is broken because there is no alarm function when the water of the cooling tower is short of water.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a transformer cooling system for a transformer, And an object of the present invention is to provide an apparatus and method for protecting a cooling means of an underground combined substation in which a motor switching operation is performed by sensing a loss of cooling function due to a shortage of water supply.

According to another aspect of the present invention, there is provided an apparatus for protecting a cooling means of an underground combined-use substation, the apparatus comprising: a low-current detecting contact, which is opened and closed based on a load current input from a pump starting circuit of a cooling means, ; A UC sensing unit for determining whether the cooling function of the cooling unit is lost based on whether the low current sensing contact is open or closed; And a power supply unit for switching the motor of the cooling unit when it is determined that the cooling function is lost in the UC sensing unit.

The low current sensing contact sets the set current for low current operation control.

The low current sensing contact is connected in parallel to the bottom of the magnet installed in the pump starting circuit, receives the load current, and opens when the input load current is below the set current.

The UC sensing unit judges that the cooling function of the cooling means is lost when the contact for low current sensing is opened.

An overcurrent motor stop contact which is opened or closed based on the load current input from the pump start circuit; And an EOCR sensing unit for determining whether or not a motor overcurrent is generated in the cooling unit based on whether or not the overcurrent motor stopping contact is open or closed.

The power supply unit switches the motor of the cooling means when it is judged that the EOCR sensing unit generates the overcurrent of the motor.

In order to achieve the above-mentioned object, a cooling method protecting method of an underground combined-use substation according to an embodiment of the present invention is characterized in that a load current and a set current inputted from a pump start- Determining whether the cooling function of the cooling means is lost; And performing switching to another motor when it is determined by the cooling device protecting device of the underground combined substation that the cooling function of the cooling means is lost in the determining step.

Wherein the step of determining comprises the steps of: opening and closing the current based on the load current input from the pump starting circuit and the predetermined set current by the current sensing contact; And determining that the cooling function of the cooling means is lost if the low current sensing contact is opened by the UC sensing unit.

In the opening / closing operation step, when the input load current is equal to or lower than the set current, the low current sensing contact is opened.

The determining step includes setting the set current for low current operation control by the low current sensing contact.

The method further includes determining whether an overcurrent of the motor is generated based on the load current input from the pump starting circuit by the cooling device protecting device of the underground combined substation.

In the step of performing switching to another motor, switching to another motor is performed by the cooling device protecting device of the underground combined substation when it is determined that the overcurrent of the motor is generated in the step of determining whether the overcurrent of the motor is generated.

The step of determining whether or not an overcurrent of the motor is generated includes the steps of: opening / closing operation based on a load current input from the pump starting circuit by the overcurrent motor stopping contact; And determining that the overcurrent of the motor is generated when the overcurrent motor stopping contact is opened by the EOCR sensing unit in the opening and closing operation.

According to the present invention, an apparatus and method for protecting a cooling means of an underground combined substation detects a load current of a cooling means, and when a current of 50% or less of a steady state is sensed, It is possible to prevent the transformer installed in the underground combined substation from being burned down by detecting the loss of cooling function due to the detachment, lack of water in the cooling tower, and the like.

In addition, the apparatus and method for protecting the cooling means of the underground combined substation prevent the transformer installed in the geosynthetics substation from being burned out, thereby preventing the occurrence of the wide-area power outage, thereby stabilizing the power supply.

1 to 3 are diagrams for explaining a conventional electronic overcurrent relay installed for protecting a cooling means of a transformer.
4 is a view for explaining an apparatus for protecting a cooling means of an underground combined-use substation according to an embodiment of the present invention;
5 is a view for explaining an installation example of a cooling device protecting device of the underground combined-cycle substation of FIG.
6 is a view for explaining a contact for low current sensing in Fig. 5; Fig.
7 is a flowchart illustrating a method of protecting a cooling means of an underground combined-use substation according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the technical idea of the present invention. . In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for protecting a cooling means of an underground combined-use substation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 4 is a view for explaining an apparatus for protecting a cooling means of an underground combined-use substation according to an embodiment of the present invention. FIG. 5 is a view for explaining an example of an installation of a cooling means protecting apparatus of an underground combined- 6 is a view for explaining the contact for low current sensing of FIG.

The protection device for the cooling means of underground combined substation is installed to protect the cooling means installed in the underground combined substation. At this time, the protection device for the cooling means of the underground complex substation includes the start circuit of the gas purification blower, A starting circuit of the circulating pump, a starting circuit of the cooling tower fan, and a starting circuit of the cooling tower sprinkling pump. The protection device for the cooling means of the underground combined substation detects the low current due to belt fault or deviation of the impeller or cooling fan connected to the motor controlled by each starter circuit and the shortage of water in the cooling tower to judge whether the cooling function of the cooling means is lost or not . When the cooling function of the underground combined substation is lost, the cooling unit protects the cooling unit. Then, it sends the fault signal to the power supply unit.

4, the cooling device protecting apparatus 300 of the underground combined substation includes a relay starting contact 310, an overcurrent motor stopping contact 320, an EOCR detecting unit 330, A contact point 340, a UC sensing unit 350, an operation power supply contact point 360, and a power supply unit 370. 5, the cooling device protecting apparatus 300 of the underground combined substation is installed in the main pump starting circuit 210 and the standby pump starting circuit 220, respectively.

The relay starting contact 310 is connected in parallel to the lower ends 212 and 222 of the relay 49X1 or 49X2 provided in the pump starting circuit 200 to supply the starting power to the relay 49X1 or 49X2.

The overcurrent motor stopping contact 320 is connected in parallel to the lower ends 214 and 224 of the magnet (88M1 or 88M2) installed in the pump starting circuit to receive the load current. At this time, the overcurrent motor stopping contact 320 maintains the closed state (i.e., the connected state) when the normal load current is input, and opens (i.e., blocks) when the load current corresponding to the overcurrent is input.

The EOCR sensing unit 330 determines whether the overcurrent of the motor is generated by determining whether the overcurrent motor stopping contact 320 is open or closed. That is, the EOCR sensing unit 330 determines that the overcurrent of the motor is generated when the overcurrent motor stopping contact 320 is opened. The EOCR sensing unit 330 determines that a fault has occurred in the occurrence of an overcurrent and transmits a fault occurrence signal to the power supply branch.

The low current sensing contact 340 sets the set current for low current operation control. That is, as shown in FIG. 6, the cooling means of the transformer installed in the underground combined-substation transforms the cooling function due to failure of the impeller connected to the motor, failure or detachment of the cooling fan, lack of water in the cooling tower, ), The current flows approximately 50% of the normal operation state (i.e., FULL LOAD). In the present invention, the set current is set in consideration of the above characteristics, and the low current detecting contact 340 is cut off when a load current of less than the set current flows. That is, the set current is set to about 9 A when the cooling device protecting device 300 of the underground combined substation is installed in the gas circulation blower. When the cooling device protecting device 300 of the underground combined substation is installed in the oil circulation pump, the set current is set to about 3A. When the cooling device protection device 300 of the underground combined substation is installed in the cooling water water circulation pump, the set current is set to about 6A. When the cooling device protecting device 300 of the underground combined substation is installed in the cooling tower fan, the set current is set to about 9A. When the cooling tower protection device 300 of the underground combined substation is installed in the cooling tower sprinkling pump, the set current is set to approximately 2A. When the cooling device protecting device 300 of the underground combined substation is installed in the oil-air cooling type cooler blower, the set current is set to about 12A.

The low current sensing contact 340 is connected in parallel to the lower ends 216 and 226 of the magnet 88M1 or 88M2 provided in the pump starting circuit 200 to receive the load current. The low current sensing contact 340 maintains a closed state (i.e., connected state) when a load current exceeding the set current is input, and is opened (i.e., blocked) when a load current less than the set current is input. For example, if the main gas circulation blower of the transformer and the preliminary gas circulation blower are provided with the cooling device protecting device 300 of the underground combined substation, the set current is set to about 9A. At this time, when a failure occurs in the impeller of the gas purification blower, a load current of about 8 A flows to the low current sensing contact 340 (see FIG. 6). As a result, the low current sensing contact 340 is opened.

The UC sensing unit 350 determines whether the cooling function is lost based on whether the low current sensing contact 340 is open or closed. That is, the UC sensing unit 350 determines that the cooling function of the corresponding cooling unit is lost when the low current sensing contact 340 is opened due to a fault in the impeller, failure or breakage of the cooling fan, or lack of water in the cooling tower. The UC sensing unit 350 transmits a failure occurrence signal to the power supply failure when the cooling function is lost.

The operating power supply contact point 360 is connected to the motor and receives the driving power (or operating power) of the motor. That is, the operating power supply contact point 360 is connected to the power supply line 230 of the motor to supply driving power.

The power supply unit 370 controls power supply to the motor according to the detection (determination) result of the EOCR sensing unit 330 and the UC sensing unit 350. That is, the power supply unit 370 determines that the motor is in the normal state (i.e., no overcurrent is generated) in the EOCR sensing unit 330 and the cooling function of the cooling unit is in the normal state (I.e., a state in which a low current is not generated), the driving power input through the operating power supply contact point 360 is supplied to the motor. The power supply unit 370 senses that an overcurrent is generated in the motor by the EOCR sensing unit 330 or senses that the cooling function of the cooling unit is lost in the UC sensing unit 350, The supply of the driving power to the motor is interrupted and the motor is switched to another motor. That is, the power supply unit 370 switches from the main motor M1 to the standby motor M2 when the cooling function of the cooling unit is lost, or is switched from the standby motor M2 to the main motor M1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cooling method protection method of an underground combined-use substation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 7 is a flowchart illustrating a method of protecting a cooling means of an underground combined-use substation according to an embodiment of the present invention.

The overcurrent motor stopping contact 320 receives the load current from the starting circuit of the motor. That is, the overcurrent motor stopping contact 320 is connected in parallel to the lower end of the magnet (88M1 or 88M2) provided in the pump starting circuit to receive the load current. The overcurrent motor stop contact 320 maintains the closed state when a normal load current is input, and is opened when a load current corresponding to an overcurrent is input. The EOCR sensing unit 330 determines whether an overcurrent occurs in the motor based on whether the overcurrent motor stopping contact 320 is open or closed (S100). At this time, the EOCR sensing unit 330 determines that the overcurrent of the motor is generated when the overcurrent motor stopping contact 320 is opened.

The low current sensing contact 340 is connected in parallel to the lower end of the magnet (88M1 or 88M2) installed in the pump starting circuit to receive the load current. The low current sensing contact 340 maintains the closed state when a load current exceeding the set current is input, and is opened when a load current equal to or lower than the set current is input. That is, when a fault of the impeller, a failure or deviation of the belt of the cooling fan, a shortage of water in the cooling tower, or the like occurs, the low current sensing contact 340 is opened to a load current of less than a set current. At this time, the set current is a value set for the low current operation control, and is set differently according to the starting circuit in which the cooling means protecting apparatus 300 of the underground combined substation is installed. The UC sensing unit 350 determines whether the cooling function is lost based on whether the low current sensing contact 340 is open or closed (S200). That is, the UC sensing unit 350 determines that the cooling function of the corresponding cooling unit is lost when the low current sensing contact 340 is opened due to a fault in the impeller, failure or breakage of the cooling fan, or lack of water in the cooling tower.

The EOCR sensing unit 330 and the UC sensing unit 350 transmit a failure occurrence signal to the power supply terminal at step S400. That is, the EOCR sensing unit 330 determines that a fault occurs when an overcurrent occurs, and transmits a fault occurrence signal to the power supply branch. The UC sensing unit 350 transmits an alarm signal to the power supply when the cooling function is lost.

The power supply unit 370 performs switching to another motor when an over-current is generated or a cooling function is lost (S500). That is, the power supply unit 370 controls power supply to the motor according to the detection (determination) result of the EOCR sensing unit 330 and the UC sensing unit 350, and performs switching to another motor. At this time, the power supply unit 370 determines that the motor is in a normal state (i.e., no overcurrent is generated) in the EOCR sensing unit 330 and the cooling function of the cooling unit is in the normal state (I.e., a state in which a low current is not generated), the driving power input through the operating power supply contact point 360 is supplied to the motor. The power supply unit 370 senses that an overcurrent is generated in the motor by the EOCR sensing unit 330 or senses that the cooling function of the cooling unit is lost in the UC sensing unit 350, (I.e., a spare motor) from being supplied to the motor.

As described above, an apparatus and method for protecting a cooling means of an underground combined substation detects a load current of a cooling means and switches the motor when a current of less than 50% of a steady state is sensed, whereby a failure of the impeller, It is possible to prevent the transformer installed in the underground combined substation from being burned down by detecting the loss of cooling function due to the detachment, lack of water in the cooling tower, and the like.

In addition, the apparatus and method for protecting the cooling means of the underground combined substation prevent the transformer installed in the geosynthetics substation from being burned out, thereby preventing the occurrence of the wide-area power outage, thereby stabilizing the power supply.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It will be understood that the invention may be practiced.

300: Cooling device protection device of underground combined substation
310; Relay start contact point 350: Overcurrent motor stop contact point
330: EOCR sensing part 340: Low current sensing contact
350: UC sensing part 360: Operation power contact
370: Power supply unit

Claims (13)

A low current sensing contact opened and closed based on a load current input from the pump starting circuit of the cooling means and a predetermined set current;
A UC sensing unit for determining whether the cooling function of the cooling unit is lost based on whether the low current sensing contact is open or closed; And
And a power supply unit for switching the motor of the cooling unit when it is determined that the cooling function is lost in the UC sensing unit. The method according to claim 1,
The low-current-detecting contact includes:
And the set current for controlling the low current operation is set. The method according to claim 1,
The low-current-detecting contact includes:
Wherein the switching means is connected in parallel to the lower end of the magnet installed in the pump starting circuit to receive a load current and to open when the input load current is lower than the set current. The method according to claim 1,
Wherein the UC sensing unit comprises:
Wherein the control unit determines that the cooling function of the cooling unit is lost when the contact for low current detection is opened. The method according to claim 1,
An overcurrent motor stopping contact which is opened or closed based on a load current input from the pump starting circuit; And
Further comprising an EOCR sensing unit for determining whether an over current of the motor of the cooling unit is generated based on whether the overcurrent motor stop contact is opened or closed. The method of claim 5,
The power supply unit includes:
And the motor of the cooling unit is switched when it is determined that the EOCR sensing unit generates an overcurrent of the motor. Determining whether the cooling function of the cooling means is lost based on the load current and the set current inputted from the pump starting circuit of the cooling means by the cooling means protecting device of the underground combined substation; And
And a step of performing switching to another motor when it is determined by the cooling device protecting device of the underground combined-substation that the cooling function of the cooling device is lost in the determining step. . The method of claim 7,
Wherein the determining step comprises:
Opening / closing operation based on a load current input from the pump starting circuit and a predetermined set current by a low current detecting contact; And
And determining that the cooling function of the cooling unit is lost if the contact for low current sensing is opened by the UC sensing unit. The method of claim 8,
In the opening and closing operation,
Wherein the low current sensing contact is opened when the input load current is less than the set current. The method of claim 7,
Wherein the determining step comprises:
And setting the set current for low current operation control by the low current sensing contact. The method of claim 7,
Further comprising a step of determining whether an overcurrent of the motor is generated based on a load current input from the pump starting circuit by a cooling device protecting device of the underground combined-substation substation. The method of claim 11,
In the step of performing the switching to the other motor,
Wherein the cooling means protection device of the underground combined-use substation performs switching to another motor when it is determined that an over-current is generated in the step of determining whether an over-current is generated in the motor, . The method of claim 11,
In the step of determining whether or not the overcurrent of the motor is generated,
Opening / closing operation based on a load current input from the pump starting circuit by an overcurrent motor stopping contact; And
And determining that the overcurrent of the motor is generated when the overcurrent motor stopping contact is opened in the opening and closing operation by the EOCR sensing unit.
KR1020130022865A 2013-03-04 2013-03-04 Apparatus and method for protecting cooling device of underground substation KR20140108945A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102054268B1 (en) 2019-06-27 2019-12-10 주식회사 창대이앤씨 Intelligent integrated system of underground complex commercial facility that performs air conditioning in connection with fire occurrence

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102054268B1 (en) 2019-06-27 2019-12-10 주식회사 창대이앤씨 Intelligent integrated system of underground complex commercial facility that performs air conditioning in connection with fire occurrence

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