KR20220135288A - High Voltage Powr Receiving Unit - Google Patents

Abstract

The present invention relates to a small extra-high voltage power receiving facility comprising: an inlet that delivers the extra-high voltage from the lead-in to the extra-high voltage platen; an automatic fault classification switch that selectively and automatically separates the fault section of the extra-high voltage; a lightning arrester connected to the downstream of the automatic fault identification switch; a power fuse connected to the automatic fault identification switch and selectively blocking the fault current; a transformer connected to the power fuse and converting the extra-high voltage current into a step-down voltage and outputting the same to a load; and a load receiving the step-down voltage from the transformer. A low-voltage three-phase watt-hour meter is formed between the transformer and the load to meter and measure the total amount of electric power.

Description

High Voltage Power Receiving Unit

The present invention relates to an extra-high voltage power receiving facility, and more particularly, to a small special high voltage power receiving facility in which the space inside the power receiving facility is reduced by omitting the MOF (Metering Out Fit) from the configuration of the power receiving facility.

In general, as shown in FIG. 1, in an extra-high voltage sealed power receiving facility, a load switchgear, a power fuse, an arrester, and an instrument transformer (MOF) for power supply and demand are sealed with SF ₆ gas in the tank, and circuit breakers and instrument transformers, etc. Manufactured by reducing the appearance compared to existing products. carrying. It is configured for easy installation, and each device is housed in one module, so that the accident range is localized to prevent spread to other parts in the event of an accident such as an internal short circuit. The explosion-proof device is configured to protect the device and the operator from the arc, so that the arc can be safely induced through the arc passage in case of an accident, and the distance between devices is reduced through direct connection between devices, and the distance between devices is reduced. The installation area is minimized through vertical arrangement, and all bare conductors are removed in the high-voltage part to secure safety from the risk of electric shock, and the power receiving facility that eliminates the internal short-circuit accident in advance is used.

In other words, in order to receive special high voltage such as factories, buildings, and apartment complexes and drop the voltage to an appropriate low voltage commercial voltage, a power receiving facility including a transformer, a switch device, and other safety devices is provided. When arranging high-voltage switch devices and related instruments around a large-sized transformer to fit the capacity determined by the unit, they have been installed by installing a frame. Since a sufficient separation distance has been maintained between devices, a large installation area was required to install the substation facility. In order to minimize the size of these substation facilities, a gas insulated device that can be used is used, but the price competition intensifies and high cost is required.

In this existing method, electric power devices are generally used in general buildings, so products that are easy to transport and install are required. However, there were many limitations in reducing the installation area.

Korean Patent Publication No. 2014-0025325 Korean Patent Publication No. 2011-0133400 Korean Patent Publication No. 2006-0117553

MOF (Metering Out Fit: instrument transformer box) is a special high-voltage power receiving facility that reduces the internal space by excluding the MOF inside the power receiving facility, which is a facility used to use a high-voltage watt-hour meter for simple integrated power measurement. The purpose is to provide

In addition, it aims to provide an extra-high voltage power receiving facility that can monitor the state of the power receiving facility by acquiring temperature, current vibration, power and image data of the power receiving facility, and comparing the acquired data with pre-stored data. .

In addition, it is to provide a failure prediction diagnosis device that monitors the presence or absence of abnormalities in power reception facilities in real time to prevent large-scale failures due to malfunction of protective relays, etc.

In order to solve this problem, the present invention provides an automatic fault sorting switch and automatic fault sorting switch that selectively and automatically separates the inlet that delivers the extra high voltage from the incoming pole to the extra high voltage board and the fault section of the extra high voltage. A transformer that is connected to the connected lightning arrester and the automatic fault classification switchgear, a power fuse that selectively blocks the fault current and the power fuse, and a transformer that converts the extra high voltage current into a step-down and outputs it to the load, and the step-down from the transformer An extra-high voltage power receiving facility including a load receiving voltage, characterized in that a low-voltage three-phase watt-hour meter is formed between the transformer and the load to measure and measure an integrated power amount.

In addition, the three-phase watt-hour meter is connected in series to one of the three-phase current to measure the current; and a control unit that calculates the amount of power consumed using the current value measured by the resistance unit, and a communication unit that transmits or receives the amount of power measured in each phase to calculate and transmit the total amount of power of the three-phase power supply.

In addition, the three-phase watt-hour meter is characterized in that it further includes an independent power supply for supplying independent power.

In addition, it is characterized in that a circuit breaker for protecting the small extra-high voltage power receiving facility from an accident current is further formed under the load.

Therefore, the present invention eliminates the MOF (instrument transformer) in the existing power receiving facility, and replaces the role of the MOF (instrument transformer) through ASS (automatic switching division switch) and TR (transformer). This has the effect of being able to provide an extra-high voltage power receiving facility that reduces the internal space of the substation room.

1 is a connection diagram of a conventional extra-high voltage power receiving facility.
2A is a schematic diagram of an extra-high voltage power receiving facility;
Figure 2b is a schematic diagram of a power receiving facility according to the present invention.
3 is a block diagram of a three-phase watt-hour meter.
4 is a block diagram of an apparatus for predicting and diagnosing a failure of a power receiving facility;
5 is a block diagram of a server;
6 is a view showing the operating state of the power receiving facility.
7 is a flowchart illustrating a method for monitoring a power receiving facility;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are marked on different drawings.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, since the terms used in the present application are only used to describe specific embodiments, it is not intended to limit the present invention, and the singular expression means a plural expression unless the context clearly indicates otherwise. we want to leave

2A is a schematic diagram of a power receiving facility, FIG. 2B is a schematic diagram of a power receiving facility according to the present invention, FIG. 3 is a block diagram of a three-phase watt-hour meter, FIG. 4 is a block diagram of a failure prediction diagnosis apparatus of a power receiving facility, and FIG. is a block diagram of a server, FIG. 6 is a view showing the operating state of the power receiving facility, and FIG. 7 is a flowchart showing a monitoring method of the power receiving facility.

Referring to FIG. 2A, it is a schematic diagram of a conventional ultra-high voltage power receiving facility. When compared with FIG. 2B as shown, FIG. 2B according to an embodiment of the present invention shows that MOF (reference numerals are omitted) is excluded. have. Therefore, the ultra-high voltage power reception facility of the present invention eliminates the MOF, which is a device for using a high-voltage watt-hour meter for simple integrated watt-hour metering, and ASS (Automatic Section Switch 10: automatic fault classification switch) and TR (Automatic Section Switch 10) in one case (not shown) Transformer 20: It is an ultra-high voltage power receiving facility with only a transformer). Hereinafter, the ultra-high voltage power receiving facility will be abbreviated as 'power receiving facility'.

Accordingly, FIG. 2B shows an automatic fault classification switch 10 that selectively and automatically separates the inlet (not shown) that transmits the extra high voltage voltage from the lead (not shown) to the extra high voltage board and the fault section of the extra high voltage voltage. A lightning arrester (not shown) connected downstream of the automatic failure classification switch 10 and a power fuse (not illustrated) connected to the automatic failure classification switch 10 and selectively blocking the fault current and the power fuse are connected A low-voltage three-phase watt-hour meter is installed in an existing ultra-high voltage power receiving facility consisting of a transformer 20 that converts the extra high voltage current into step-down and outputs it to a load, and a load 40 that receives the step-down voltage from the transformer 20. (30) is a configuration that is further included.

Again, a description will be given of the power receiving facility of the present invention with reference to FIG. 2B. For reference, it is not to do all the components of the power receiving facility, but to explain the ASS (10), TR (20), three-phase watt-hour meter 30 and the load 40 shown in Fig. 2b, which are the main components. We would like to clarify

The ASS 10 shown as described above is an Automatic Sectionalizing Switch (ASS), in which the electric wire is inserted or opened so that the fault current of the extra-high voltage line on the supplier side or the fault current of the consumer does not spread. It is a device that shuts off and conducts electricity.

That is, the ASS 10 is installed as the main switch at the inlet (not shown) and automatically divides and separates the faulty section in cooperation with the rear protection device (not shown). is a protective device.

The TR (20) is a transformer, and in order to use the electricity generated by the power plant at home or in a factory, the voltage must be raised or lowered.

The low-voltage three-phase watt-hour meter 30 is an electronic watt-hour meter of a three-phase power system, and it is a device that senses voltage and current, displays it as a predetermined value, and measures and records the time during which the power passed through the circuit flows.

The load 40 serves to receive electricity, and serves to receive the transformed electricity through the TR 20 .

A circuit breaker (not shown) for protecting the power receiving facility of the present invention from an accident current is further formed under the load 40 .

In this way, the present invention measures the amount of accumulated electricity using the low-pressure three-phase watt-hour meter 30, and without the need for MOF equipment, it is possible to manufacture an ultra-high voltage power receiving facility that can be used with only the ASS 10 and the TR 20. there will be

Hereinafter, a description will be given of the low-pressure three-phase watt-hour meter 30 capable of measuring the amount of electricity with accompanying drawings. 3 is a block diagram of a three-phase watt-hour meter 30 according to an embodiment of the present invention.

The watt-hour meter 30 of the three-phase power supply as described above is connected in series to one of the three-phase currents to measure the amount of current, and the independent power supply unit 33 and the resistor unit for supplying power independent of the three-phase power source. and a control unit 32 for calculating the amount of power consumed by using the amount of current measured by (31). Therefore, by using the low-voltage three-phase watt-hour meter 30, it is possible to measure and record the total amount of power used for a certain period of time. There is no need for the metamorphic MOF (Metering Out Fit).

The resistor unit 31 may be a resistor connected in series to the current flow of the three-phase power supply. The resistance part 31 should have a small value because the voltage drop should be minimized. For example, the resistance value may be about 100 μΩ to 120 μΩ, but is not limited thereto.

The resistor unit 31 may measure the voltage drop across its own ends and measure the amount of current using its resistance value.

The independent power supply unit 33 may provide power independent of the three-phase power source. This means that it must be independent of the three-phase power source, and it means that it must be isolated or separated so as not to be affected by the three-phase power source. In order to configure each phase current or voltage similar to measuring the current or voltage for a single phase, it is required to eliminate the line-to-line voltage difference between each phase.

If the voltage drop value through the three resistor units 31 is detected without such an independent power supply unit 33 and input to each control unit 32, these values are eventually generated due to a voltage difference of about 380 Volts, the control unit ( 32) will be damaged. Therefore, each of the three-phase watt-hour meter 30 is preferably provided with an independent power supply unit 33 independent of each power source.

The controller 32 is a general microprocessor, microcontroller, controller, etc., calculates a power value using the measured voltage value and the measured current value, and accumulates it over time to calculate the total amount of consumed power.

In addition, the three-phase watt-hour meter 30 may further include a separate resistor (not shown) for measuring the voltage of the three-phase power supply.

In addition, the controller 32 may calculate the amount of power consumed in the corresponding phase by using the measured current and the measured voltage, and may calculate the total amount of power consumption by integrating the amount of power consumed in each phase.

Three-phase watt-hour meter 30 may exist one for each phase power in order to measure the amount of power of each of the three-phase power sources. In addition, the three-phase watt-hour meter 30 includes an insulated communication unit 34, and the communication unit 34 ), it is possible to calculate the total amount of power by transmitting or receiving the amount of power measured in each phase. That is, the calculated amount of power is transmitted to the power receiving facility through the communication unit 34 .

In addition, the three-phase watt-hour meter 30 forms a separate control unit (not shown) even if the control unit 32 is included, so that the separate control unit receives the amount of power from the control unit 32 of the three-phase watt-hour meter 30 . can be received to calculate the total amount of power.

Hereinafter, a diagnostic apparatus and method for monitoring an ultra-high voltage power receiver according to the present invention will be described.

4 is a block diagram illustrating a diagnosis apparatus 100 for monitoring a power receiving facility according to an embodiment of the present invention. As shown, it has a configuration including a CPU module 120 , an interface module 130 , a communication module 140 , a server 150 , and a terminal 160 .

The CPU module 120 controls the overall power reception facility. Receives the current value flowing through the MCCB (Mold Case CircuitBreaker) 11 and MC (Magnetic Contactor) 12 formed in the power receiving facility, and transmits the current value to the communication module 140 do.

In addition, when a reset command for the power receiving facility is input through the communication module 140 , the CPU module 120 resets the power receiving facility according to the reset command.

The interface module 130 generates communication status information corresponding to the communication status of the protection relay 13 , for example, EOCR (Electronic Overload Relay), and transmits the communication status information to the communication module 140 .

The communication module 140 collects the current value and communication state information input from each of the CPU module 120 and the interface module 130 and transmits it to the server 150 through a communication network such as Ethernet.

The server 150 analyzes the current value and communication state information input from the communication module 140 and outputs the analysis result. In this case, the power receiving facility predicts and diagnoses the failure of the power receiving facility based on the analysis result, and alerts an abnormal operation state of the power receiving facility.

The terminal 160 inputs various control commands to the server 150 and outputs various information received from the server 150 . Here, the terminal 160 may be a PC, a PDA, a smart phone, a notebook computer, or a tablet PC.

Referring to FIG. 5 , the server 150 includes a communication interface unit 151 , a database unit 152 , a communication state analysis unit 153 , a current value analysis unit 154 , a history management unit 155 , and a second control unit ( 156 ), an alarm unit 157 , an interface unit 158 , and a second communication unit 159 .

The communication interface unit 151 provides a communication interface between the server 150 and the communication module 140 . The communication interface unit 151 separates the current value and communication state information from the data received from the communication module 140 , and inputs them to the current value analyzer 154 and the communication state analyzer 153 , respectively.

In addition, the communication interface unit 151 transmits the current value and communication state information to the database unit 152 so that the database unit 152 can store the current value and communication state information.

The database unit 152 includes a data storage unit 521 for storing the current value input from the communication interface unit 151 and communication state information, and the analysis analyzed by the communication state analysis unit 153 and the current value analysis unit 154 . and an analysis result storage unit 522 for storing the results.

The communication state analysis unit 153 analyzes the communication state information received from the communication interface unit 151 and generates the analysis result. In this case, the communication state analysis unit 153 stores the analysis result in the database unit 152 in units of year/month/day/hour/minute/second. Through this, it is possible to accurately recognize the failure history in units of year/month/day/hour/minute/second in relation to communication state malfunction due to malfunction or non-operation of the protective relay 13 .

The current value analysis unit 154 analyzes the current value transmitted from the communication interface unit 151 and generates the analysis result. The current value analysis unit 154 determines whether the current value continues for more than a set time in a state in which the current value increases by a set ratio or more than the previously stored maximum current value. Here, the setting ratio and the setting time may be variously set based on the current value in a state in which the probability of occurrence of a failure is very high before the actual failure of the power receiving facility occurs. The set ratio can be employed as more than 10% of the maximum current value, and through this, it can be recognized that an overcurrent is flowing in the power receiving facility. In addition, it is preferable that the set time can be set to 5 seconds, but is not limited thereto.

As such, when the current value is maintained at 10% or more of the maximum current value and continues for more than 5 seconds, it is a state before an actual failure of the power receiving facility occurs, and the probability of a failure in the power receiving facility is very high. Therefore, in this state, an abnormal operation condition of the power receiving facility is alarmed so that the person in charge can check the corresponding power receiving facility, and through this, the failure of the power receiving facility can be prevented in advance. In this process, it is possible to replace or inspect the accessories of the power receiving facility, and to perform pre-measures and maintenance due to the actual failure of the power receiving facility, so that the failure can lead to a large-scale failure or ripple failure of the power plant, etc., or lead to a fire. can be prevented in advance.

In addition, the current value analyzer 154 analyzes the current value as described above to monitor whether leakage ground fault current occurs, and also monitors whether phase loss, reverse phase, unbalanced current, low current, and the like occur. In addition, the current value analysis unit 154 monitors whether a stop phenomenon occurs during startup or operation of the power receiving facility through the current analysis as described above.

In response to the control signal of the second control unit 156, the alarm unit 157 alerts an abnormal operation state of the power receiving facility through video or audio.

The interface unit 158 receives various control commands related to the operation of the motor control panel 10 through the terminal 160 and transmits them to the second control unit 156 , and outputs an operation result according to the control command.

The control command may include a reset command to reset the power receiving facility, a history information output command to output history information on the operation of the power receiving facility, and the like. In addition, the control command may include all various control commands related to the overall operation of the power receiving facility.

The second communication unit 159 performs wired/wireless communication with the terminal 160 , and transmits the analysis results of the current value analysis unit 154 and the communication state analysis unit 153 to the terminal 160 . The operation result of the power receiving facility according to one control command is transmitted to the terminal 160 .

In addition, the second communication unit 159 transmits the abnormal operation state of the power receiving facility to the terminal 160 according to the control signal of the second control unit 156 based on the analysis result. Through this, it is possible to immediately recognize not only the operating state of the power receiving facility, but also the abnormal operating state of the power receiving facility through the terminal 160 .

The second control unit 156 controls the server 150 as a whole, and as described above, according to the analysis results of the current value analysis unit 154 and the communication state analysis unit 153 , the power reception facility is transmitted through the alarm unit 157 . of the operating status abnormality.

In this case, as a result of the analysis of the current value analysis unit 154, the second control unit 156 receives power through the alarm unit 157 if the current value is increased by more than a set ratio compared to the previously stored maximum current value and continues for more than a set time. It warns of abnormal operation status of equipment.

Also, the second control unit 156 controls the server 150 according to a control command input from the interface unit 158 . For example, after alarming an abnormal operation state of the power receiving facility through the alarm unit 157 , when a reset command is input from the interface unit 158 , the second control unit 156 issues a reset command through the communication interface unit 151 . It is transmitted to the CPU module 120 . Accordingly, the CPU module 120 resets the power receiving equipment according to the reset command of the server 150 .

Meanwhile, when a history information output command is input from the interface unit 158 , the second control unit 156 generates history information through the history management unit 155 , and uses the history information generated by the history management unit 155 . It is transmitted to the terminal 160 through the second communication unit 159 or output through the interface unit 158 .

The history management unit 155 generates history information on the history of changes in the current value and the failure history of the power receiving facility based on the analysis result of the current value stored in the database unit 152 and the current of the power receiving facility. In this case, the history management unit 155 generates history information on the current value in units of year/month/day/hour/minute/second and also generates history information on the communication state of the protection relay 13 . .

6 illustrates an operation state of the power receiving facility output through the terminal 160 .

Identification information of power receiving equipment (H918B12(K7) 25 EA), tag record (name) of the corresponding power receiving equipment, motor status (status), protective relay (EOCR) status (eocr), MCCB status (MCCB), MC starting status ( MC), the current value, the number of accumulated faults of the protection relay (ECOR), as well as a remote reset button (reset) for inputting a reset command to the power receiving facility is shown.

Hereinafter, an operation process of the apparatus for predicting and diagnosing a failure of a power receiving facility according to an embodiment of the present invention will be described with reference to the drawings. 7 is a flowchart illustrating an example of an operation process of the apparatus 100 for predicting and diagnosing a failure of a power receiving facility according to an embodiment of the present invention.

As shown, the CPU module 120 receives the current value flowing through the MCCB 11 and MC 12 of the power receiving facility ( S110 ), and transmits the current value to the communication module 140 .

In addition, the interface module 130 receives the communication status information of the protection relay 13, for example, EOCR (Electronic Overload Relay) (S120), and transmits the communication status information to the communication module 140.

When the current value and communication state information are input from each of the CPU module 120 and the interface module 130 , the communication module 140 provides the current value and communication state information input from each of the CPU module 120 and the interface module 130 . are collected and transmitted to the server 150 (S130).

The communication interface unit 151 of the server 150 inputs the data received from the communication module 140 to the current value analysis unit 154 and the communication state analysis unit 153, respectively, and to the database unit 152. The current value and communication state information are transmitted and stored, respectively (S140).

Then, the communication state analyzer 153 analyzes the communication state information received from the communication interface unit 151 and generates the analysis result. In addition, the current value analysis unit 154 analyzes the current value received from the communication interface unit 151 and generates the analysis result (S150). In this case, the current value analysis unit 154 analyzes whether the current value continues for more than a set time in a state in which the current value increases by a set ratio or more than the previously stored maximum current value.

Next, the database unit 152 stores the analysis results of the communication state analysis unit 153 and the current value analysis unit 154 ( S160 ).

In addition, when the second control unit 156 is analyzed by the current value analysis unit 154 as a state in which the current value is increased by a set ratio or more than the previously stored maximum current value and continues for more than a set time, the power is received through the alarm unit 157 . It warns of abnormal operation status of equipment.

In addition, when the second control unit 156 is analyzed by the current value analysis unit 154 whether phase loss, reverse phase, unbalanced current, low current, or a sudden stop phenomenon occurs during starting operation, the alarm unit 157 based on this analysis Alerts an abnormal operation state of the power receiving facility through (S170).

On the other hand, when a control command is input from the interface unit 158 or the terminal 160 in addition to alerting an abnormal operation state of the power receiving facility, the server 150 executes the corresponding control command and outputs the operation result.

As described above, the present embodiment monitors the operating state of the power receiving facility to detect abnormal signs such as power cables at an early stage and alerts the operating state abnormalities.

In addition, by monitoring the presence or absence of abnormality in the protective relay 13 in real time, it is possible to prevent a large failure due to a malfunction or non-operation of the protective relay 13, and overload or failure of the power receiving facility and the power cable (not shown) Early detection of changes in fault current (short-circuit current or ground fault current, etc.) due to a fire in the

In addition, this embodiment enables to prevent a fire in the power cable, etc. by warning and action at an early stage of abnormal operation of the power receiving facility due to overheating of the power cable, etc., and if the power receiving facility fails, to the person in charge to prevent ripple failure and shorten the restart time of the power receiving facility.

Furthermore, this embodiment monitors the contact points of the power receiving facility and the MC 12, etc. to prevent erroneous operation by the person in charge, and enables the person in charge to manage the maintenance history of accessories installed in the power receiving facility, etc. Allows the replacement cycle to be calculated.

Those skilled in the art to which the present invention pertains as described above will understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the above-described embodiments are illustrative and not restrictive.

The scope of the present invention is indicated by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

10: Automatic failure classification switch (ASS) 11: MCCB
12: MC 13: protection relay
20: Transformer 30: 3-phase watt-hour meter
31: resistance part 32: control part
33: independent power unit 34: communication unit
40: load
100: diagnostic device 120: CPU module
130: interface module 140: communication module
150: server 151: communication interface unit
152: database unit 153: communication state analysis unit
154: current value analysis unit 155: history management unit
156: second control unit 157: alarm unit
158: interface unit 159: second communication unit
160: terminal 521: data storage unit
522: analysis result storage unit

Claims (4)

An automatic fault classification switch that selectively and automatically separates the inlet that transmits the extra high voltage voltage from the incoming pole to the extra high voltage board and the fault section of the extra high voltage, and an arrester connected downstream of the automatic fault classification switch and the automatic fault classification switch and a power fuse for selectively blocking the fault current and a power fuse connected to the power fuse, including a transformer that converts the extra high voltage current into a step-down and outputs it to a load, and a load that receives the step-down voltage from the transformer In the high-voltage power receiving facility,
Extra-high voltage power reception facility, characterized in that a low-voltage three-phase watt-hour meter is formed between the transformer and the load to measure and measure the accumulated electric power.
According to claim 1, wherein the low-pressure three-phase watt-hour meter
a resistance unit connected in series to one of the three-phase currents to measure the current; and
a control unit for calculating the amount of power consumed by using the current value measured by the resistor unit;
Extra high voltage power reception facility consisting of a communication unit that transmits or receives the amount of power measured in each phase and calculates and transmits the total amount of power of the three-phase power source.
3. The method of claim 1 or 2,
Extra-high voltage power reception facility, characterized in that the three-phase watt-hour meter further includes an independent power supply unit for supplying independent power.
The method of claim 1,
Extra-high voltage power receiving facility, characterized in that the circuit breaker for protecting the small special high voltage power receiving facility from fault current is further formed under the load.

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