KR101306447B1 - Saving power typed zero harmonic filter built-in relay - Google Patents

Abstract

PURPOSE: A power saving-type image harmonic filter with an embedded relay is provided to separate electrically an image harmonic filter from busbars if separation conditions are satisfied, thereby minimizing an increase of electric charges. CONSTITUTION: A zigzag wiring transformer (1100) is connected electrically with an R-phase busbar (10), an S-phase busbar (20), a T-phase busbar (30), and an N-phase busbar (40). The zigzag wiring transformer removes image harmonics by circulating the image harmonics in the inside. Each of switching units (1200a-1200c) is positioned on each line for connecting the zigzag wiring transformer to the R-phase busbar, the S-phase busbar, and the T-phase busbar. A control module (1400) separates electrically the zigzag wiring transformer from the R-phase busbar, the S-phase busbar, and the T-phase busbar in a separation time zone. The control module connects the zigzag wiring transformer to the R-phase busbar, the S-phase busbar, and the T-phase busbar in a connection time zone. [Reference numerals] (1000) Image harmonic wave filter; (1100) Zigzag wiring transformer; (1300) Relay; (1310) Current measuring unit; (1320) Voltage measuring unit; (1330) Load measuring unit; (1400) Control module; (1410) Image calculating unit; (1420) N current measuring unit; (1430) Current scanning unit; (1440) Image formation determining unit; (1450) Reverse image determining unit; (1460) Temperature measuring unit; (1470) Switch opening and closing unit; (1480) Timer; (1490) Alarm unit; (1500) Display unit

Description

Power-saving image harmonic filter with built-in relay {SAVING POWER TYPED ZERO HARMONIC FILTER BUILT-IN RELAY}

The present invention relates to an image harmonic filter, and more particularly, to a power saving image harmonic filter incorporating a relay.

As the spread of devices expands, neutral harmonic currents in three-phase four-wire distribution systems can cause various types of disturbances. Image harmonics can cause breaker trip due to overcurrent, temperature rise and deterioration of transformer, malfunction of protector, neutral overheat / fire, and communication failure. In order to reduce such image harmonics, an image harmonic filter may be installed between the load secondary distribution panel and the secondary side of the transformer. In order to maximize the image harmonic reduction rate, the image harmonic filter is preferably installed at the position closest to the load side, that is, at the distribution panel. As is well known, the image harmonic filter includes a zigzag connection transformer, and the image harmonic filter can be removed by circulating the video content introduced from the N phase into the zigzag connection transformer.

Such an image harmonic filter may block the image harmonics from flowing to the power supply by removing the image portion from the load side, but may cause problems such as an increase in electric charges and a power factor decrease due to the image harmonics. Specifically, the zigzag connection transformer in the image harmonic may act as a load to increase the electric charge, and the power factor may be lowered by the reactance component of the zigzag connection transformer.

In addition, the existing distribution panel in which the image harmonic filter is installed includes the current value information of each phase, the voltage value information of each phase, the load amount connected to the distribution panel, the image information of the N phase, the information of the image flowing into the image harmonic filter, the presence of phase, and the reverse phase. No means to display information such as the temperature of the image harmonic filter. For this reason, there was a problem that the distribution panel operator could not be provided with various information necessary to check the status of the distribution panel.

Accordingly, an object of the present invention is to provide an image harmonic filter capable of minimizing an increase in power rates and power factor reduction by an image harmonic filter while maintaining a function of filtering image harmonics as much as possible.

In addition, the present invention, the current value information of each phase, the voltage value information of each phase, the load amount connected to the distribution panel, the image information of the N phase, the information of the image flowing into the image harmonic filter, whether the phase is missing, whether the reverse phase, the temperature of the image harmonic filter, etc. An object of the present invention is to provide an image harmonic filter capable of providing various information necessary for checking the same distribution panel state.

Other objects of the present invention will be readily understood through the following description of the embodiments.

Image harmonic filter according to an embodiment of the present invention for achieving the above object is a power-saving image harmonic filter with a built-in relay, R phase bus bar, S phase bus bar, T phase bus bar and N phase A zigzag connection transformer electrically connected to the busbar and removing the image harmonics by circulating the image harmonics therein; A switching unit positioned on a line connecting the zigzag connection transformer and the R phase bus bar, the S phase bus bar, and the T phase bus bar, respectively; and the zigzag connection transformer at the separation time based on preset time information. And a control module electrically isolated from the phase busbar, the phase S busbar, and the phase T busbar, and connecting the zigzag connection transformer with the phase R busbar, phase S busbar, and phase T busbar at connection time.

The method of claim 1, further comprising a relay for calculating the load connected to the R-phase busbar, S-phase busbar and T-phase busbar, wherein the control module is the R-phase busbar, S-phase busbar and When the load connected to the T-phase busbar is less than or equal to a preset load limit, the zigzag connection transformer may be electrically separated from the R-phase busbar, the S-phase busbar, and the T-phase busbar.

The control module scans an image of the current on the N-phase busbar at a predetermined period to calculate an average value of the image for each time zone, and the zigzag connection at a time period when the calculated image-average average value is equal to or less than a predetermined image minute lower limit. The transformer may be electrically isolated from the R phase busbar, the S phase busbar and the T phase busbar.

The control module may electrically disconnect the zigzag connection transformer from the R phase bus bar, the S phase bus bar, and the T phase bus bar at a predetermined separation time.

The control module may electrically disconnect the zigzag connection transformer from the R phase bus bar, the S phase bus bar, and the T phase bus bar when the temperature on the zigzag connection transformer exceeds a preset upper temperature limit. .

In addition, the control module, when the temperature on the zigzag connection transformer exceeds a predetermined temperature upper limit value, even if the connection time corresponds to the zigzag connection transformer, the zigzag connection transformer to the R phase busbar, S phase busbar and T phase It can be electrically separated from the busbar.

The control module may further include an image segment calculator configured to calculate an image portion on the N-phase busbar; An N-phase current measuring unit configured to calculate an image flowed into the zigzag connection transformer from the N-phase busbar; An imaging determination unit to determine whether or not an image is formed in at least one of the R phase, the S phase, and the T phase; And a reverse phase determination unit to determine whether or not the reverse phase in at least one of the R phase, S phase, and T phase; And a temperature measuring unit for measuring a temperature on the zigzag connection transformer, wherein the image portion on the N-phase busbar calculated by the image powder calculating unit and the N-phase busbar calculated by the N-phase current measuring unit The R-phase, the S-phase, determined by the reverse phase determination unit as a result of determination of the image phase in the zigzag connection transformer, at least one of the R phase, S phase, T phase determined by the phase determination unit The display unit may further include a display unit configured to display at least one of temperatures on the zigzag connection transformer measured by the temperature measuring unit as a result of determining whether or not the reverse phase in at least one of the T phases.

As described above, in the present invention, when the separation condition corresponds to the image harmonic filter, the power factor reduction and the electric charge increase due to the image harmonic filter may be minimized by electrically separating the image harmonic filter.

In the present invention, even when the connection condition corresponds to the image harmonic filter by separating the image harmonic filter from the busbar in preference to the connection condition when the temperature value of the zigzag connection transformer measured by the temperature measuring unit is equal to or greater than the preset upper limit. The accident caused by overload of the filter can be prevented.

In addition, the present invention can extend the life of the control module and minimize the power consumption of the control module by controlling the image harmonic filter based on preset time information.

In addition, the present invention extends the life of the control module by scanning the image at a predetermined period, and controlling the connection / disconnection of the image harmonic filter by using the scanned value until the next period, the power consumption of the control module Can be minimized.

In addition, the present invention can greatly simplify the structure of the control module by separating the image harmonic filter only at a predetermined separation time.

In addition, the present invention is the current value information of each phase, the voltage value information of each phase, the load information connected to the distribution panel, the image information of the N phase, the information of the image flowing into the image harmonic filter, whether the phase is missing, whether the reverse phase, the temperature of the image harmonic filter By displaying information such as whether the switching unit is open or closed, the distribution panel operator can provide various information necessary for checking the distribution panel state.

1 shows a state diagram in which an image harmonic filter is installed in a distribution board according to an exemplary embodiment of the present invention.
FIG. 2 is a diagram for describing an operation of opening or closing a switching unit according to a scanning result of the current scanning unit of FIG. 1.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be.

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, an image harmonic filter according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 shows a state diagram in which an image harmonic filter is installed in a distribution board according to an exemplary embodiment of the present invention. FIG. 2 is a diagram for describing an operation of opening or closing a switching unit according to a scanning result of the current scanning unit of FIG. 1. DESCRIPTION OF EMBODIMENTS Hereinafter, in order to make the gist of the present invention clearer, the description of the conventionally well-known technology will be briefly made.

Referring to FIG. 1, as is well known, the distribution board 1 includes R phase busbars 10, S phase busbars 20, T phase busbars 30, and N located at the output terminal of the main breaker 50. The upper bus bar 40 may be included. In addition, the image harmonic filter 1000 may be installed on the distribution panel 1.

The image harmonic filter 1000 includes a zigzag connection transformer 1100, a switching unit 1200a, 1200b, 1200c, a relay 1300, a control module 1400, a display unit 1500, and a CT 1600. can do.

The zigzag connection transformer 1100 is connected to the R-phase busbar 10, the S-phase busbar 20, the T-phase busbar 30, and the N-phase busbar 40, and as noted, the N-phase busbar The image fraction may be removed by circulating the image fraction introduced through the bar 40.

The switching units 1200a, 1200b, and 1200c are positioned on a line connecting the R-phase busbar 10, the S-phase busbar 20, and the T-phase busbar 30 and the zigzag connection transformer 1100, respectively. The zigzag connection transformer 1100 is connected to the R phase busbar 10, the S phase busbar 20, the T phase busbar 30, and the N phase booth by being turned on by the control of the control module 1400. Electrically connected to the bar 40, the zigzag connection transformer 1100 is turned off by the control of the control module 1400, R phase busbar 10, S phase busbar 20, T It may be separated from the phase busbar 30 and the N phase busbar 40. The on / off conditions of the switching units 1200a, 1200b, and 1200c will be described later in detail.

The relay 1300 may include a current measuring unit 1310, a voltage measuring unit 1320, and a load measuring unit 1330.

The current measuring unit 1310 may measure respective current values on the R-phase busbar 10, the S-phase busbar 20, the T-phase busbar 30, and the N-phase busbar 40. The current measuring unit 1310 is a R phase busbar 10, S phase busbar 20, T phase through a CT (Current Transformer, not shown) installed on the busbar (10, 20, 30, 40) of each phase The signal corresponding to the current on the busbar 30 and the N-phase busbar 40 is applied, and using the signal, the R-phase busbar 10, the S-phase busbar 20, and the T-phase busbar 30 ) And the current on the N-phase busbar 40 can be measured. The current measuring unit 1310 transmits current values of the R phase busbars 10, the S phase busbars 20, the T phase busbars 30, and the N phase busbars 40 on the display unit 1500. Can be displayed.

The voltage measuring unit 1320 may measure voltage values of the R-phase busbars 10, the S-phase busbars 20, the T-phase busbars 30, and the N-phase busbars 40. The voltage measuring unit 1320 is a phase R busbar 10, a phase S busbar 20, and a phase T through a PT (Potential Transformer, not shown) installed on each phase of the busbars 10, 20, 30, and 40. The signal corresponding to the voltage of each of the busbar 30 and the N-phase busbar 40 is applied, and using the signal, the R-phase busbar 10, the S-phase busbar 20, and the T-phase busbar Voltages on the 30 and the N-phase busbars 40 can be measured. The voltage measuring unit 1320 may transmit the voltage values of the R phase busbars 10, the S phase busbars 20, the T phase busbars 30, and the N phase busbars 40 through the display unit 1500. Can be displayed.

The load measuring unit 1330 may calculate the total load connected to the distribution panel using the current value measured by the current measuring unit 1310 and the voltage value measured by the voltage measuring unit 1320. At this time, as is well known, the total load can be calculated by calculating the load consumed for each phase and summing the loads calculated for each phase. The load measuring unit 1330 may display at least one of the calculated total load amount and each phase load amount through the display unit 1500.

The control module 1400 includes an image part calculating unit 1410, an N-phase current measuring unit 1420, a current scanning unit 1430, an image determining unit 1440, an inverse phase determining unit 1450, a temperature measuring unit 1460, The switch opening and closing unit 1470, a timer 1480, and an alarm unit 1490 may be included.

The image split calculator 1410 may calculate the image split on the N-phase busbar 40. To this end, the image fraction calculating unit 1410 detects a current on the N-phase busbar 40 through a CT (not shown) installed on the N-phase busbar 40 side, and performs frequency analysis on the detected current. The video content can be calculated by this. The image fraction may be calculated using image harmonics in a predetermined band. The image fraction calculator 1410 may display the calculated size of the image through the display 1500.

The N-phase current measuring unit 1420 may measure an image flowed into the zigzag connection transformer 1100 from the N-phase busbar 40. To this end, through the CT 1600 installed on the line connecting the N-phase busbar 40 and the zigzag connection transformer 1100 can measure the image content flowing into the zigzag connection transformer 1100. The N-phase current measuring unit 1420 may display the size of the image flowed into the calculated zigzag connection transformer 1100 through the display unit 1500.

The current scanning unit 1430 may scan the image harmonics on the N-phase busbar 40 for a preset time according to an external command or a predetermined period. The scanning time may be one day. Here, the scanned image harmonic may be a preset band, for example, 3 harmonics, 6 harmonics, 9 harmonics, and the like. The image harmonic to be scanned may be three harmonics, and the scanned image harmonic band may be unlimited. The current scanning unit 1430 may convert the magnitude of the scanned image harmonics into an average value in a predetermined time unit. Referring to FIG. 2, in FIG. 2, the horizontal axis may mean time, and the vertical axis may mean an image. 2 illustrates a result of the current scanning unit 1430 scanning for one day. The dotted line may be, for example, the peak value of the sum of three harmonics and six harmonics converted by the current scanning unit 1430. The height of the bar graph may mean an average value of the images in each time zone (for one hour). With reference to the scanning result of the current scanning unit 1430, the switch opening and closing unit 1470 switches the zigzag connection transformer 1100 to the R phase busbar 10 and S at a time when the average value of the image of the day is less than or equal to the preset image division lower limit. It may be separated from the phase busbar 20 and the phase T busbar 30. In contrast, the switch opening / closing unit 1470 switches the zigzag connection transformer 2100 to the R phase bus bar 10, the S phase bus bar 20, and the T phase booth when the average value of the image minutes of the day exceeds the preset image minute lower limit. It may be connected to the bar (30).

 For this method, a timer 1480 may be provided, and the switch opening / closing unit 1470 acquires time information from the timer 1480, and the zigzag connection transformer 1100 at a time when the average image minute value is equal to or lower than a preset image minute lower limit value. ) May be separated from the R phase busbar 10, the S phase busbar 20, and the T phase busbar 30. After image harmonics are diagnosed in a specific region or a specific distribution panel and an image harmonic filter is installed according to the diagnosis result, image harmonics may be generated differently from the diagnosis result. According to the present invention, the image harmonic filter may be selectively connected to or separated from the busbar according to the image harmonic generation rate at the load side installed after the image harmonic filter is installed. Specifically, the present invention scans the image harmonics after a predetermined period, for example, every month after being installed, and sets the zigzag connection transformer 1100 to the zigzag connection transformer 1100 at a time when the average value of the image segment is less than or equal to the predetermined image segment lower limit. It can be separated from the upper busbar 10, the S-phase busbar 20 and the T-phase busbar 30. As a result, when the video harmonic filter is not necessary because the video content is small, the video harmonic filter 1000 is separated from the R phase busbar 10, the S phase busbar 20, and the T phase busbar 30. As a result, it is possible to prevent the power factor from being lowered by the video harmonic filter and the increase of the electric charge. Of course, it is also possible to monitor the image harmonics on the N phase in real time and separate the image harmonic filters when the image harmonics are below a predetermined lower limit, but this method can consume excessive power to calculate the image harmonics in real time and the image harmonics. It may be inappropriate to consider the increase in management cost by shortening the life of the switching unit through excessive switching when repeating over and under the preset image lower limit. The usage pattern of the power consumer may be constant on a monthly or seasonal basis. Accordingly, the image of the image on N is scanned on a monthly basis, and the zigzag connection transformer 1100 at the time when the switch opening / closing unit 1470 is equal to or less than the predetermined image segment lower limit in the same pattern for one month according to the scanned result. Even if it is separated from the R-phase busbar 10, the S-phase busbar 20 and the T-phase busbar 30, it is possible to achieve a sufficient reduction effect on the image harmonics. At the same time, it is possible to minimize power factor reduction and increase of electric charges due to the image harmonic filter, and to minimize the maintenance cost of the image harmonic filter and the power consumption of the image harmonic filter.

On the contrary, the separation time of the image harmonic filter is preset by the designer, and the switch opening / closing unit 1470 switches the zigzag connection transformer 1100 to the R phase busbar 10 and the S phase busbar 20 only at the preset separation time. , Can be electrically separated from the T-phase busbar 30. Time zones with a large amount of image harmonics may differ depending on the image harmonic installation location. Therefore, the preset separation time may be set variably according to the installation position by the designer.

As described above, the present invention can control the separation and connection of the image harmonic filter based on the set time information. Here, the set time information may be a disconnection or connection time arbitrarily set by the designer. Alternatively, the set time information may be a time zone (separation time) that is equal to or lower than an image division lower limit value based on a result scanned by the current scanning unit, and a time zone (connection time) that exceeds an image division lower limit value.

The imaging determination unit 1440 may determine whether the imaging is performed in a preset manner. For example, the imaging determination unit 1440 detects phase signals of the R, S, and T phases, and then detects any of the phases of the detected R, S, and T phases at a high level for a predetermined time or more. A costume can be judged as an open phase. The image determination unit 1440 may display a determination result on whether an image is lost on each of the R, S, and T phases through the display unit 1500.

The reverse phase determination unit 1450 may determine whether or not the reverse phase in a predetermined manner. For example, the reverse phase determination unit 1450 detects phase signals of R, S, and T phases, and detects a high level of R phase among the detected phase signals of each phase, and when a high level of S phase is detected within a predetermined phase angle. It can be judged as reversed. The reverse phase determination unit 1450 may display the determination result on the reverse phase for each of the R, S, and T phases through the display unit 1500.

The temperature measuring unit 1460 may measure the temperature on the zigzag connection transformer 1100. To this end, the temperature measuring unit 1460 may calculate a temperature using an electrical signal received from a temperature sensor (not shown) installed on the zigzag connection transformer 1100. The temperature measuring unit 14600 may display the temperature on the zigzag connection transformer 1100 through the display unit 1500.

The switch opening / closing unit 1470 controls the zigzag connection transformer 1100 to the R phase busbars 10 and S by controlling the on and off of the switching units 1200a, 1200b, and 1200c according to preset connection and disconnection conditions. It may be connected to or separated from the upper busbar 20 and the T phase busbar 30. The switch opening and closing unit 1470 may display the on and off states of the switching units 1200a, 1200b, and 1200c through the display unit 1500. The connection and separation conditions can be summarized as shown in Table 1 below.

Separation condition -When the total load connected to the busbar is below the preset load limit
-When the temperature on the zigzag connection transformer is higher than the preset upper temperature limit
-In case of preset separation time
-When the average value of the image minutes is less than the preset image minimum value based on the scanning result (separation time) Connection conditions -When the total load connected to the busbar exceeds the preset load limit
-The temperature on the zigzag connection transformer is less than the preset upper temperature limit.
-In case of preset connection time
-When the average value of the image minutes is the time zone (connection time) that exceeds the preset image minimum value based on the scanned result

The switch opening and closing part 1470 sets a total load amount connected to the distribution board 1 from the load measuring part 1330 in order to control the ON and OFF of the switching parts 1200a, 1200b and 1200c according to the above connection conditions and separation conditions And can receive the temperature on the zigzag wiring transformer 1100 from the temperature measuring unit 1460 at a predetermined cycle and can receive the time information from the timer. When the switch opening / closing unit 1470 corresponds to any one of the above separation conditions, the image harmonic filter 1000 may be electrically separated from the busbar by turning off the switching units 1200a, 1200b, and 1200c. In contrast, the switch opening and closing unit 1470 may electrically connect the image harmonic filter to the busbar by turning on the switching units 1200a, 1200b, and 1200c when any one of the above connection conditions is met. However, 1) the total load connected to the busbar exceeds the preset load limit during the connection condition. 2) the preset connection time. 3) the average value of the images according to the scanned result is in the time zone when the preset image load lower limit is exceeded. In either case, when the temperature value measured by the temperature measuring unit 1460 is equal to or higher than a preset upper limit temperature, the switch opening and closing unit 1470 turns off the switching units 1200a, 1200b, and 1200c, thereby connecting conditions. First, the image harmonic filter can be electrically separated from the busbar. This may be to prevent an accident due to overload of the image harmonic filter.

In addition, the present invention 1) a method of separating the image harmonic filter from the busbar when the total load connected to the busbar is less than the predetermined load limit upper limit value 2) the video harmonic filter when the temperature on the zigzag connection transformer is above the preset temperature upper limit value 3) A method of separating the image harmonic filter from the bus bar at a preset separation time 4) A method of separating the image harmonic filter from the bus bar at a preset time of separation. Only one of the methods of separating from the bar may be used. In this case, the components corresponding to the unused method may be implemented in an omitted form. For example, when using only a method of electrically separating the image harmonic filter from the busbar at a predetermined separation time, the current scanning unit 1430 may be omitted. When only the method of electrically separating the image harmonic filter from the busbar at a predetermined separation time, the structure of the control module 1400 may be very simplified, and the manufacturing cost of the image harmonic filter may be very low. The control module 1400 may include a setting unit (not shown) capable of resetting the separation time by the operator, since the time zone in which the amount of image harmonics is small may be changed according to the load state after the installation. When the separation time is reset by the operator during operation, the switch opening and closing unit 1470 may control on / off of the switching units 1200a, 1200b, and 1200c according to the reset separation time. In the above, the method using the separation time may replace the method using the average image value. In this case, the separation time may be substituted for a time zone in which the average image minute value of the previously measured day is equal to or less than the preset image minute lower limit value.

The timer 1480 may provide time information to the current scanning unit 1430 and the switch opening and closing unit 1470. In this case, if it is determined that the preset period has arrived with reference to the time provided by the timer 1480, the current scanning unit 1430 may perform scanning. The switch opening and closing unit 1470 may control the on / off of the switching units 1200a, 1200b, and 1200c by referring to the time provided by the timer 1480 and the scanning result of the current scanning unit 1430.

The alarm unit 1490 may provide an alarm when the phase determination unit 1440 determines that the phase is lost, when the reverse phase determination unit 1450 determines that the phase is reversed, or when the temperature is equal to or greater than a preset upper temperature limit.

The display unit 1500 may include 1) a current value on at least one of the R, S, T, and N phase busbars 10, 20, 30, and 40 measured by the measurement unit 1310, and 2) a voltage measurement unit ( Voltage values on at least one of the bus bars 10, 20, 30, and 40 of R, S, T, and N phases measured by 1320, 3) the total load connected to the distribution panel, and 4) the load connected to each phase. 5) an image on the N-phase busbar 40 calculated by the image part calculating unit 1410, 6) a zigzag connection transformer from the N-phase busbar 40 measured by the N-phase current measuring unit 1420. At least one of whether the image flows into (1100), 7) the result of the determination of phase loss, 8) the result of the determination of the reverse phase, 9) the temperature on the zigzag connection transformer 1100, and 10) whether the switching units 1200a, 1200b, and 1200c are opened or closed. One can be displayed. The display unit 1500 may be installed on the image harmonic filter or may be installed in the distribution panel enclosure. That is, there may be no limitation on the installation position of the display unit 1500. Components of the control module 1400 as described above may be implemented as a whole or a part thereof. In addition, some components may be fabricated as separate modules.

As described above, when the separation condition corresponds to the separation condition, the image harmonic filter is electrically separated from the busbar, thereby minimizing the power factor reduction and the electric charge increase due to the image harmonic filter.

In the present invention, even when the connection condition corresponds to the image harmonic filter by separating the image harmonic filter from the busbar in preference to the connection condition when the temperature value of the zigzag connection transformer measured by the temperature measuring unit is equal to or greater than the preset upper limit. The accident caused by overload of the filter can be prevented.

In addition, the present invention can extend the life of the control module and minimize the power consumption of the control module by controlling the image harmonic filter based on preset time information.

In addition, the present invention extends the life of the control module by scanning the image at a predetermined period, and controlling the connection / disconnection of the image harmonic filter by using the scanned value until the next period, the power consumption of the control module Can be minimized.

In addition, the present invention can greatly simplify the structure of the control module by separating the image harmonic filter only at a predetermined separation time.

In addition, the present invention is the current value information of each phase, the voltage value information of each phase, the load information connected to the distribution panel, the image information of the N phase, the information of the image flowing into the image harmonic filter, whether the phase is missing, whether the reverse phase, the temperature of the image harmonic filter By displaying information such as whether the switching unit is open or closed, the distribution panel operator can provide various information necessary for checking the distribution panel state.

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

1: distribution board
10: R phase busbar
20: S phase busbar
30: T phase busbar
40: N phase busbar
50: main breaker
1000: video harmonic filter
1100: Zigzag connection transformer
1200a, 1200b, 1200c: switching unit
1300: relay
1310: current measurement unit
1320: voltage measurement unit
1330: load measurement unit
1400: control module
1410: image calculation unit
1420: N phase current measuring unit
1430: current scanning unit
1440: image determination unit
1450: reversed phase determination unit
1460: temperature measurement unit
1470: switch opening
1480: timer
1490: alarm unit
1500: display unit

Claims (7)

In the power saving image harmonic filter with a built-in relay,
Zigzag connection transformer electrically connected to R-phase busbar, S-phase busbar, T-phase busbar, and N-phase busbar and eliminating image harmonics by circulating the image harmonics inside.
Switching unit located on the line connecting the zigzag connection transformer and the R-phase busbar, S-phase busbar and T-phase busbar, respectively:
The zigzag connection transformer is connected to the R phase bus bar, the S phase bus bar, and the zigzag connection transformer at the time of separation based on the time information recorded by dividing the connection time zone and the separation time zone according to the image of each time zone on the N phase bus bar. And a control module electrically isolated from the T phase busbar and connecting the zigzag connection transformer with the R phase busbar, the S phase busbar, and the T phase busbar at a connection time. delete The method of claim 1,
The control module includes:
The image harmonic filter, wherein the time information is updated at a predetermined period. delete The method of claim 1,
The control module includes:
When the temperature on the zigzag connection transformer exceeds a predetermined temperature upper limit,
And the zigzag connection transformer is electrically separated from the R phase bus bar, the S phase bus bar, and the T phase bus bar. The method of claim 5, wherein
The control module includes:
When the temperature on the zigzag connection transformer exceeds a preset temperature upper limit value,
Even if it corresponds to the above connection time zone,
And the zigzag connection transformer is electrically separated from the R phase bus bar, the S phase bus bar, and the T phase bus bar. The method of claim 1,
The control module includes:
An image fraction calculator configured to calculate an image fraction on the N-phase busbar;
An N-phase current measuring unit configured to calculate an image flowed into the zigzag connection transformer from the N-phase busbar;
An imaging determination unit to determine whether or not an image is formed in at least one of the R phase, the S phase, and the T phase; And
A reverse phase determination unit to determine whether or not the reverse phase in at least one of the R phase, S phase, and T phase;
It includes a temperature measuring unit for measuring the temperature on the zigzag connection transformer,
An image portion on the N-phase busbar calculated by the image powder calculating unit, an image portion flowing into the zigzag connection transformer from the N-phase busbar calculated by the N-phase current measuring unit, and the image determining unit As a result of determination of whether or not phase loss in at least one of the determined R phase, S phase, T phase; And a display unit which displays at least one of the temperatures on the zigzag connection transformer measured by the measurement unit.

Images