KR20140108945A - Apparatus and method for protecting cooling device of underground substation - Google Patents
Apparatus and method for protecting cooling device of underground substation Download PDFInfo
- 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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- Prior art keywords
- cooling
- motor
- current
- contact
- overcurrent
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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
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- 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
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
The
As shown in FIG. 3, the electronic
The electronic
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
The
The overcurrent
The EOCR sensing unit 330 determines whether the overcurrent of the motor is generated by determining whether the overcurrent
The low
The low
The UC sensing unit 350 determines whether the cooling function is lost based on whether the low
The operating 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
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
The low
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
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 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 low-current-detecting contact includes:
And the set current for controlling the low current operation is set.
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.
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.
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 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.
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. .
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.
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.
Wherein the determining step comprises:
And setting the set current for low current operation control by the low current sensing contact.
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.
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, .
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.
Priority Applications (1)
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KR1020130022865A KR20140108945A (en) | 2013-03-04 | 2013-03-04 | Apparatus and method for protecting cooling device of underground substation |
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KR1020130022865A KR20140108945A (en) | 2013-03-04 | 2013-03-04 | Apparatus and method for protecting cooling device of underground substation |
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Cited By (1)
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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2013
- 2013-03-04 KR KR1020130022865A patent/KR20140108945A/en not_active Application Discontinuation
Cited By (1)
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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