KR101094434B1 - Apparatus for detecting abnormality of electric power source - Google Patents

Abstract

The present invention relates to a power failure detection device.

The system is connected between the power supply and the equipment to monitor whether there is a power failure, AC power input unit for receiving the AC voltage input from the power supply; A DC converter converting an AC voltage input through the AC power input unit into a DC voltage; A voltage abnormality detecting unit which determines a voltage abnormality for overvoltage or undervoltage of the input AC voltage by using the magnitude of the DC voltage; A reverse phase / phase detection unit detecting a voltage abnormality for reverse phase or phase loss of the AC voltage; A microcontroller which determines whether an abnormality of the power supply is performed using the results detected through the voltage abnormality detector and the reverse phase / phase detection detector; And it provides a power supply abnormality monitoring device including a status display unit for displaying the abnormal result determined by the microcontroller.

Power supply fault, voltage fault, phase open, reverse phase, single phase, three phase, fault detection

Description

Power anomaly detection device {APPARATUS FOR DETECTING ABNORMALITY OF ELECTRIC POWER SOURCE}

The present invention relates to a power failure detection device. In particular, the present invention relates to a device for monitoring a voltage abnormality, a phase abnormality or a power abnormality such as an open phase or a reverse phase that can be generated from a single phase power supply or a three phase power supply supplied to a facility from a single phase power supply or a three phase power supply.

In general, various production lines or various equipments are connected to a power supply and operated using power supplied from the power supply. Power supplies are classified into single-phase power supplies and three-phase power supplies, and supply single-phase power of AC 220V or three-phase power of AC 380V to various facilities.

In supplying power to various equipments from the power supply device, various abnormalities may occur such as insufficient voltage, overvoltage, or disconnection. As such, when an abnormality occurs in the power supply, the connected equipment may fail due to overvoltage or undervoltage, or the operation may be stopped, thereby causing a great loss.

Accordingly, when an abnormality occurs in the power supplied to each of the equipments, the power supply device is provided with a plurality of equipment-specific circuit breakers that prevent the failure by blocking the power supplied to the equipments in advance. Then, the breaker is connected to each facility one-to-one using the dedicated circuit breaker for each facility.

As described above, in the case of an abnormality in the power supply, the current power supply device takes measures to cut off the power supplied to the facility using a facility-specific circuit breaker. In such a method, it is possible to confirm that a power failure occurs due to the power cut off, but there is a problem in that it is not possible to determine whether any abnormality has occurred.

Accordingly, there is a demand for a device capable of monitoring occurrence of supply power failure in the power supply device.

The technical problem to be achieved by the present invention is a power supply for monitoring a power supply abnormality, such as a phase abnormality, phase or reverse phase that can be generated from the single-phase power supply or three-phase power supply to the equipment from the single-phase power supply or three-phase power supply It is to provide an abnormality detection device.

To this end, the power supply abnormality monitoring apparatus according to the embodiment of the present invention, connected between the power supply and the equipment and monitors whether or not the power supply, AC power input unit for receiving the AC voltage input from the power supply; A DC converter converting an AC voltage input through the AC power input unit into a DC voltage; A voltage abnormality detecting unit detecting a voltage abnormality for an overvoltage or undervoltage of an input AC voltage using a magnitude of a DC voltage; A reverse phase / phase detection unit detecting a voltage abnormality for reverse phase or phase loss of the AC voltage; A microcontroller which determines whether an abnormality of the power supply is performed using the results detected through the voltage abnormality detector and the reverse phase / phase detection detector; And a status display unit that displays the abnormal result determined by the microcontroller.

According to the present invention, it is possible to check whether a power failure occurs and the type of power failure generated through a power failure monitoring device connected between the power supply device and the facility device.

In addition, the S-terminal and T-terminals can be connected or the S-terminal and T-terminals can be disconnected by a simple switch operation, so that the power abnormality monitoring device can be connected to both a single-phase power supply or a three-phase power supply. . As a result, even if the power supply is changed from a single-phase power supply to a three-phase power supply or from a three-phase power supply to a single-phase power supply, the power failure monitoring device or some parts need to be replaced or the setting changed. Since there is no, there is an effect to improve the convenience of the user.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. .

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

The power abnormality monitoring apparatus according to the embodiment of the present invention may receive power from a single-phase power supply device or a three-phase power supply device, and may select single-phase or three-phase monitoring through an internal switch selection. To this end, the power abnormality monitoring device is connected to a single-phase power supply device or a three-phase power supply device.

1 is a view showing a connection configuration between a power supply abnormality monitoring device and a single-phase power supply device according to an embodiment of the present invention.

The single-phase power supply unit is connected to each facility device through a facility dedicated breaker and a ground. T and N wiring lines are connected to the facility dedicated breaker and the equipment of the single-phase power supply, and ground wires are connected to the ground and the equipment of the single-phase power supply. That is, the single-phase power supply and the equipment are connected via the T, N, ground terminal.

Accordingly, the power supply abnormality monitoring apparatus according to the embodiment of the present invention is connected to the T, N wiring line between the single-phase power supply device and the equipment and the ground of the single-phase power supply device.

At this time, the single-phase power supply and the equipment can be connected via the R terminal or the S terminal in addition to the T terminal.

2 is a diagram illustrating a connection configuration between a power supply abnormality monitoring device and a three-phase power supply device according to an exemplary embodiment of the present invention.

The three-phase power supply device is connected to each facility device through a facility dedicated disconnect and ground. R, S, and T wiring lines are connected to the facility-specific breaker and the equipment of the three-phase power supply, and ground wires are connected to the ground and the equipment of the three-phase power supply. That is, the three-phase power supply unit and the installation unit are connected through the R, S, T, ground terminal.

Accordingly, the power supply abnormality monitoring apparatus according to the embodiment of the present invention is connected to the R, S, T wiring line between the three-phase power supply device and the facility and the ground of the three-phase power supply device.

3 is a block diagram schematically illustrating an internal configuration of a power failure monitoring device according to an embodiment of the present invention.

Power supply abnormality monitoring apparatus according to an embodiment of the present invention is the AC power input unit 110, DC converter 120, DC power supply 130, voltage abnormality detection unit 140, reverse phase / phase detection unit 150, microcontroller (MCU: micro-controller unit, hereinafter referred to as 'MCU') 160, cover opening detection unit 170, switch operation unit 180, status display unit 190 and the abnormal output unit 200.

The AC power input unit 110 is a portion that selectively receives the AC power input from the connected single-phase power supply or three-phase power supply.

The internal configuration of the AC power input unit 110 is configured as shown in FIG.

That is, the AC power input unit 110 according to the embodiment of the present invention includes an input terminal block 410, a switch 420, a noise protection circuit unit 430, and first to third transformers 440 to 460.

The input terminal block (TB) 410 is composed of five input terminals of R, S, T, N, and ground and is connected to a single phase power supply or a three phase power supply.

The switch 420 is a switch for determining whether to supply power to the power abnormality monitoring device. When the administrator of the power abnormality monitoring device turns on the switch 420, the S terminal and the T terminal are connected to each other. Power for operation is supplied, and when the administrator of the power abnormality monitoring device turns off the switch 420, the S terminal and the T terminal are cut off, and thus the power supply for the operation of the power abnormality monitoring device is stopped. Here, in actually implementing the AC power input unit 110 according to the embodiment of the present invention, the switch 420 may be implemented in the switch operation unit 180.

The noise protection circuit unit 430 is composed of a coil filter, a surge protection voltage regulator, and the like, and serves to protect the circuit from surge voltages.

The first to third transformers 440 to 460 lower the input voltage. Here, in the case of single-phase monitoring, the voltage of AC 220V input to the T and N terminals becomes very low by the third transformer (T3) 460, and in the case of three-phase monitoring, input to the R, S, and T terminals. The three-phase voltage of AC 380V is converted low by the first transformer 440 to the third transformer 460, respectively.

The AC voltage lowered by the AC power input unit 110 is transferred to the DC converter 120. In the following description, the AC voltage lowered by the first transformer 440 is referred to as R_I and R_O, and the AC voltage lowered by the second transformer 450 is referred to as S_I and S_O, and by the third transformer 460. The lowered AC voltage will be described as T_I and T_O.

The DC converter 120 converts an AC voltage transferred from the AC power input unit 110 into a DC voltage. The internal configuration of the DC converter 120 is configured as shown in FIG. That is, the DC converter 120 according to the embodiment of the present invention includes three bridge diodes 510 to 530.

The first bridge diode (BD1) 510 converts the AC voltage R_I and R_O on R transferred from the first transformer 440 into the DC voltage R_V on R, and the second bridge diode (BD2) 520. ) Converts AC voltages S_I and S_O on S transmitted from the second transformer 450 into DC voltages S_V on S, and the third bridge diode BD3 530 is connected from the third transformer 460. The AC voltages T_I and T_O on T are converted into DC voltages T_V on T.

The DC converter 120 synthesizes the DC voltage of each phase converted by the first bridge diode 510 to the third bridge diode 530 to generate an internal circuit operation input voltage V_C.

Accordingly, the DC converter 120 may generate the input voltage regardless of the input of the single phase or the three phase, and in the case of three-phase monitoring, the input voltage may be generated even if a state in which one phase is disconnected occurs.

The DC power supply unit 130 performs a function of generating an internal circuit operating power of DC 5V from the internal circuit operating input voltage V_C converted by the DC converter 120 through the constant voltage regulator 610 of FIG. 6. In addition, a function of displaying an internal circuit operation power generation state through the LED (620 of FIG. 6). The internal structure of the DC power supply unit 130 is configured as shown in FIG.

Since the power supply abnormality detecting apparatus according to the embodiment of the present invention converts the input monitoring power and uses the internal operating power, it is impossible to store the abnormal state and output the abnormality when an imaging abnormality such as a complete power failure occurs.

Accordingly, as shown in FIG. 6, the supercapacitors 630 and 640 of 0.1F or more are connected in parallel to the internal operating power supply VCC to the supercapacitors 630 and 640 for a predetermined time in a full power failure state such as an abnormal phase. By maintaining the internal operating power supply by using the charged voltage, it outputs the abnormality to the outside and stores the abnormal state in the memory (EEPROM) mounted inside the MCU 160, so that the cause of the error is restored when the power is restored again. Make a distinction.

The voltage abnormality detecting unit 140 determines a voltage abnormality such as an overvoltage or undervoltage by using the magnitude of the DC voltage converted by the DC converter 120. To this end, the voltage abnormality detection unit 140 is configured as shown in FIG. 7.

That is, in the voltage abnormality detector 140 according to the embodiment of the present invention, the DC voltages R_V, S_V, and T_V converted by the bridge diodes 510 to 530 of the DC converter 120 may be MCU 160. The voltage level is reduced by using a resistor so as to be input to the input terminal of, and the reference voltage level for determining the over and under voltage of the single-phase and three-phase voltages is adjusted by using the variable resistors 710 to 730.

At this time, the firmware inside the MCU 160 varies the criterion for determining the abnormality of the excess and undervoltage according to the input of the single-phase / 3-phase selection switch implemented in the switch operation unit 180. That is, in case of three-phase monitoring, the MCU 160 checks the voltage levels of R_VOUT, S_VOUT, and T_VOUT to determine whether there is an abnormality in overvoltage or under voltage. To judge.

Here, the reference voltage level for determining the over- and undervoltage in the single-phase voltage and the reference voltage level for determining the over- and undervoltage of the three-phase voltage may be different.

The reverse phase / phase detection unit 150 serves to detect an abnormality of reverse phase and phase loss. To this end, the internal configuration of the reverse phase / phase detection unit 150 is configured as shown in FIG. 8.

That is, the reverse phase / phase detection unit 150 has AC voltages R_I and R_O, S_I and S_O, T_I and T_O of each phase lowered by the first transformer 440 to the third transformer 460 of the AC power input unit 110. They pass through the first photocoupler 810 to the third photo coupler 830 to generate a square wave (DC_R, DC_S, DC_T) of 60Hz, such as the waveform shown in FIG. Then, the presence or absence of the phase loss in the single-phase and three-phase monitoring by using the square wave generation for a certain time. In addition, as shown in FIG. 9, the phase difference T1 between the R-S phases and the phase difference T2 between the R-T phases are checked to determine whether there is an inverse phase in three-phase monitoring.

The MCU 160 determines the abnormality through the voltage abnormality detection unit 140, the reverse phase / phase detection unit 150, and the cover open detection unit 170, and outputs the abnormality determination result to the outside. do. To this end, the MCU 160 may include a voltage abnormality detection unit 140, a reverse phase / phase detection unit 150, a cover open detection unit 170, a switch operation unit 180, a status display unit 190, and an abnormal output unit 200. Connected.

The cover opening detecting unit 170 checks whether the cover of the power abnormality monitoring device is open, and transmits the result to the MCU 160 when it is confirmed that the cover is open. Accordingly, the MCU 160 displays that the cover is open. Here, checking whether the cover of the power abnormality monitoring device is opened or closed is to improve security, and the cover opening detecting unit 170 may be omitted in the actual implementation of the present invention.

The switch operation unit 180 is a part in which an administrator managing a power abnormality monitoring apparatus implements various switches for setting an operation control of the power abnormality monitoring apparatus. According to the exemplary embodiment of the present invention, the switch operation unit 180 is connected to the wiring input to the input terminal block 410 of the AC power input unit 110, the operation mode of the power supply abnormality monitoring device is a single-phase power monitoring mode or three-phase power supply A switch for operating the operation mode of one of the monitoring modes is included.

Here, the various switches implemented in the switch manipulation unit 180 may be implemented in various forms such as a key button, a keyboard, a mouse, and a touch screen.

The status display unit 190 is a part for displaying the status of the power abnormality monitoring device using the LED. That is, the status display unit 190 displays the operation status of the power supply abnormality detection device and the abnormality determination result confirmed through the MCU 160 by using the LEDs on, flashing, and off. That is, the status display unit 190 according to the embodiment of the present invention includes a plurality of LEDs, and displays voltage abnormalities, reverse phases, phase openings, cover openings, and the like by using lighting, blinking, and turning off states of the provided LEDs, respectively. As such, by displaying each abnormal state according to the lighting, blinking, and extinguishing states of the LED in the power supply abnormality detecting apparatus, various abnormal states can be efficiently displayed using a small number of LEDs.

In the actual implementation of the present invention, in addition to the method of displaying the operating state of the power abnormality detection device through the status display of the LED, a method of displaying the operating state of the abnormality detection device using the LCD window, when an error occurs, or emits a warning sound, Various methods may be used, such as a method of sending a warning message through a short message.

The abnormal output unit 200 provides an interface for transmitting and receiving data with an external device such as a control center, an alarm collecting device, and a mobile communication center, and when the abnormality is confirmed through the MCU 160 in the power abnormality detecting device, the identified abnormality It sends the details to the connected external device.

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a view showing a connection configuration between a power supply abnormality monitoring device and a single-phase power supply device according to an embodiment of the present invention;

2 is a view showing a connection configuration between a power supply abnormality monitoring device and a three-phase power supply device according to an embodiment of the present invention;

3 is a block diagram schematically illustrating an internal configuration of a power failure monitoring device according to an embodiment of the present invention;

4 is a circuit diagram briefly illustrating an internal configuration of an AC power input unit according to an embodiment of the present invention;

5 is a circuit diagram briefly illustrating an internal configuration of a DC converter according to an embodiment of the present invention;

6 is a circuit diagram briefly illustrating an internal configuration of a DC power supply unit according to an embodiment of the present invention;

7 is a circuit diagram briefly illustrating an internal configuration of a voltage abnormality detecting unit according to an embodiment of the present invention;

8 is a circuit diagram briefly illustrating an internal configuration of a reverse phase / phase detection unit according to an embodiment of the present invention;

9 is a view schematically showing a waveform passing through the photo coupler of the reverse phase / phase detection unit according to an embodiment of the present invention.

Claims (11)

In the device connected between the power supply and the equipment to monitor whether there is a power failure, An AC power input unit configured to receive an AC voltage input from the power supply device; A DC converter converting an AC voltage input through the AC power input unit into a DC voltage; A voltage abnormality detector for determining a voltage abnormality for overvoltage or undervoltage of the input AC voltage using the magnitude of the DC voltage; A reverse phase / phase detection unit detecting a voltage abnormality for reverse phase or phase loss of the AC voltage; A microcontroller which determines whether an abnormality of the power supply is performed by using the result detected by the voltage abnormality detector and the reverse phase / phase detection detector; And Status display unit for displaying the abnormal result determined by the microcontroller Power abnormality monitoring device comprising a. The method of claim 1, The power abnormality monitoring device is connected to a power supply for supplying single-phase power, or a power supply abnormality monitoring device, characterized in that connected to the power supply for supplying three-phase power. The method according to claim 1 or 2, DC power supply unit for generating an internal circuit operating power source for operating the internal circuit of the power supply abnormality monitoring device from the DC voltage converted by the DC conversion unit. Power abnormality monitoring device further including. The method according to claim 1 or 2, If an abnormality is confirmed in the microcontroller, the abnormality output unit transmits the details of the abnormality to an external device, wherein the external device includes a control center, an alarm collection device, and a mobile communication center. Power abnormality monitoring device further including. 3. The method of claim 2, The AC power input unit, An input terminal block including an input terminal connected to the power supply device and receiving AC power from the power supply device; A switch for turning on / off a power supply for the operation of the power abnormality monitoring device; Noise protection circuitry for protecting the circuit from surge voltages; And One or more transformers to lower the input voltage Power abnormality monitoring device comprising a. The method of claim 5, The input terminal block is a power supply abnormality monitoring device, characterized in that consisting of the R terminal, S terminal, T terminal, N terminal and ground terminal. The method of claim 6, When single-phase power is input from the power supply device, the single-phase voltage input to the T terminal and the N terminal is converted to low using one transformer, When three-phase power is input from the power supply, power abnormality monitoring device, characterized in that for converting the three-phase voltage input to the R terminal, the N terminal and the T terminal to each other using three transformers. 3. The method of claim 2, The DC converter, Three bridge diodes, each bridge diode converting an AC voltage on R, an AC voltage on S, and an AC voltage on T to a DC voltage on R, a DC voltage on S, and a DC voltage on T, respectively. Power abnormality monitoring device. The method of claim 1, The voltage abnormality detection unit, A power supply abnormality monitoring device, characterized in that for adjusting the reference voltage level for determining the over- and under-voltage abnormality using a variable resistor. 3. The method of claim 2, The reverse phase / phase detection unit, Three photo couplers for generating a square wave for each phase by passing the AC voltage of the R phase, the AC voltage of the S phase and the AC phase of the T phase, and using the square wave for each phase to determine whether the reverse and phase Power supply abnormality monitoring device, characterized in that the check. The method of claim 10, The reverse phase / phase detection unit, It is determined whether the phase is generated by checking whether the square wave is generated for a predetermined time, and determining whether the reverse phase is generated by checking the phase difference between the R phase and the S phase and the phase difference between the R phase and the T phase. Power supply abnormality monitoring device.

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