JP2005287256A - Digital protecting and controlling device and its display data production method, and display data production program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain flexible handling and effective use of display data and properly make a phase indication even if the effective value of a phase reference element is not sufficiently obtained. <P>SOLUTION: This display device 1 comprises an input converter 6 for analog-inputting the electrical quantity of voltage and current from a transformer 3 of a bus-bar 2 and a current transformer 5 of a transmission line 4, an analog/digital converter 7 for digital-converting the inputted electrical quantity, an operating part 9 for creating the display data by scanning the converted digital signal 8, and a display unit 10 for picture-displaying the created display data. The operating part 9 comprises a phase calculator 9a for calculating the phase of each electrical quantity element, a phase reference selector 9b for selecting a voluntary electrical quantity element as the phase reference element for a phase display in accordance with a specification from a user, and a phase display data creator 9c for creating the phase display data with reference to the phase of the selected phase reference element. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital protection control device that inputs an electric quantity of an electric power system via an analog input circuit and discriminates whether or not an electric power system has an accident. In particular, display data for displaying the electric quantity of an electric power system It is about making.

  Conventionally, there are various protection control devices for protecting and controlling the power system. Recently, there are many so-called digital protection control devices that perform protection control of the power system using digital arithmetic processing means such as a microcomputer. It has been adopted.

This digital protection control device converts the electrical quantity such as voltage and current input from the system to the analog input circuit by analog / digital conversion at a predetermined sampling frequency, and then takes in the digital signal and is necessary for system protection control. Performs arithmetic processing. For example, arithmetic processing means for determining the state of the power system based on settling conditions, and man-machine interface means that is connected to the arithmetic processing means via a system bus and incorporates a CPU that can input the settling conditions from the outside. However, there is a protection control device that performs a relay operation when the settling condition is satisfied as determined by the arithmetic processing means (see, for example, Patent Document 1).
JP 09-149537 A

  Such a digital protection control device generally has a function of displaying an electric quantity such as voltage / current obtained from the electric power system on the screen as electric quantity data indicating the state of the electric power system. FIG. 18 is a diagram showing a screen example of an input electric quantity display screen displayed by a conventional digital protection control device.

  Here, FIG. 18A shows a phase difference between each electrical quantity element by an arithmetic processing means using a digital signal obtained by analog / digital conversion of the electrical quantity inputted to the analog input circuit. It is a screen example in which an effective value is calculated and the calculation result is displayed as an input electric quantity display screen 11. In this screen example, three-phase voltage elements Va, Vb, Vc and three-phase current elements Ia, Ib, Ic are respectively displayed as electric quantity elements. In this screen example, regarding the phase information of each element, the relative phase with respect to Va of each electric quantity element when the first phase (Va) of the voltage is calculated as the phase reference for phase display is the phase of Va. In contrast, a delay phase display in which the delay direction is positive is shown.

  FIG. 18B shows a screen example of the same format as FIG. 18A, but shows a state where the effective value of Va set as the phase reference is zero. In the screen example shown in FIG. 18B, since the effective value of Va as the phase reference is zero, it is impossible to calculate the phase difference using the phase reference, and the phase display of other electric quantities is possible. Indicates a state where it is no longer possible.

  As described above, in the display method of electric quantity data in the conventional digital protection control device, the element selected as the phase reference for phase display is fixedly set in advance when performing phase display. Therefore, the degree of freedom for handling display data is insufficient, and there is a limit to the effective use of display data. In addition, since the phase reference element is fixedly set, as shown in FIG. 18B, there is no electrical quantity input of the phase reference element or it is very small, and a sufficient effective value cannot be obtained. Therefore, there is a possibility that the phase display cannot be performed normally. Furthermore, the phase display method is also fixed in advance to either the lead phase display or the lag phase display with respect to the phase reference, and from this point, the degree of freedom for handling display data is insufficient. There was a limit to the effective use of display data.

  The present invention has been made in order to solve the above-described problems, and its purpose is to realize flexible handling and effective use of display data, and even when a sufficient effective value of a phase reference element cannot be obtained. To provide a digital protection control device, a display data creation method thereof, and a display data creation program capable of performing normal display.

  In order to achieve the above object, the present invention selects a phase reference element for phase display in accordance with a designation from a user, and creates phase display data based on the phase of the phase reference element. Thus, flexible handling and effective utilization of display data can be realized, and phase display can be normally performed even when a sufficient effective value of the phase reference element cannot be obtained.

  According to a first aspect of the present invention, there is provided a digital protection control apparatus for inputting a plurality of types of electric quantities having a predetermined fundamental frequency and displaying electric quantity data after analog / digital conversion at a predetermined sampling frequency. And a phase reference selection means and a phase display data creation means. Here, the phase calculation means is means for calculating a phase for each electric quantity element of plural kinds of electric quantities. The phase reference selection means is means for selecting an arbitrary electric quantity element from among a plurality of types of electric quantities as a phase reference element for phase display in accordance with a designation from the user. Further, the phase display data creation means is based on the calculated phase and the selected phase reference element, and the difference between the phase reference element and the phase of the phase reference element for other electrical quantity elements based on the phase of the phase reference element. Is a means for generating phase display data for displaying and displaying it on the screen.

  According to the present invention, an arbitrary electric quantity element is selected as a phase reference element for phase display according to the designation from the user, and with respect to the other electric quantity elements based on the phase of the phase reference element, Phase display data for displaying the difference from the phase of the phase reference element can be created. Therefore, since the phase reference element can be freely selected, flexible handling and effective use of display data can be realized. Further, even when a sufficient effective value cannot be obtained for any selected phase reference element, phase display can be performed normally by selecting another electric quantity element as a new phase reference element.

  As described above, according to the present invention, display data is selected by selecting a phase reference element for phase display in accordance with a designation from the user and creating phase display data based on the phase of this phase reference element. Digital protection control device capable of performing phase display normally even when a sufficient effective value of the phase reference element cannot be obtained, and its display data creation method, A display data creation program can be provided.

  Embodiments to which the present invention is applied will be specifically described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing a display device of a digital protection control device according to a first embodiment to which the present invention is applied. In FIG. 1, the display device 1 is supplied with electric quantities of voltage and current from a transformer 3 provided on the bus 2 of the power system and a current transformer 5 provided on the power transmission line 4. It has become.

  This display device 1 includes an input converter 6 for analog input of voltage and current electric quantities from a transformer 3 for a bus 2 and a current transformer 5 for a transmission line 4, and an analog / digital converter for digitally converting the input electric quantity. The converter 7 includes an arithmetic processing unit (digital arithmetic processing means) 9 that takes in the converted digital signal 8 and generates display data, and a display unit 10 that displays the generated display data on the screen.

  The arithmetic processing unit 9 is a phase calculation unit (phase calculation means) 9a that calculates the phase of each electric quantity element, and a phase that selects an arbitrary electric quantity element as a phase reference element for phase display in accordance with a designation from the user. Reference selection unit (phase reference selection unit) 9b, and phase display data generation unit (phase display data generation unit) 9c that generates phase display data based on the phase of the selected phase reference element and displays it on the screen. It is equipped with.

  FIG. 2 is a flowchart showing an outline of the operation of the display device 1 shown in FIG. As shown in FIG. 2, when voltage and current quantities of electricity are input to the input converter 6 from the transformer 3 of the bus 2 and the current transformer 5 of the power transmission line 4 (S210), the input electricity The quantity is converted into a digital signal 8 at a predetermined sampling frequency by the analog / digital converter 7 and given to the arithmetic processing unit 9 (S220). The arithmetic processing unit 9 performs the following series of processes as the display data creation process (S230).

  First, the absolute phase of each electric quantity element of the digital signal 8 is calculated by the phase calculation unit 9a (S231). Next, the phase reference selection unit 9b determines whether any electric quantity element is designated as a phase reference element by the user (S232). When the electrical quantity element is designated (YES in S232), the phase reference selection unit 9b selects the designated electrical quantity element as the phase reference element (S233). When there is no designation from the user (NO in S232), an electric quantity element set in advance as a default value is selected as a phase reference element (S234).

  Subsequently, on the basis of the phase of the phase reference element based on the calculated absolute phase and the selected phase reference element by the phase display data creation unit 9c, the phase of the phase reference element is used for other electric quantity elements. The phase display data for displaying the difference between them is created (S235). The created phase display data is given to the display unit 10 and displayed on the screen (S240).

  FIG. 3 is a diagram illustrating a screen example in which the phase display data is displayed as the input electrical quantity display screen 11 by the display unit 10 in the first embodiment. Similarly to the screen example illustrated in FIG. The phase difference and the effective value are respectively displayed for the three-phase voltage elements Va, Vb, Vc and the three-phase current elements Ia, Ib, Ic. Here, (a) of FIG. 3 shows that the first phase Va of the voltage is selected as the phase reference element on the input electric quantity display screen 11, and the other electric quantity elements are relative to Va of each electric quantity element. Is represented by a lag phase display in which the lag direction is positive with respect to the phase of Va.

  FIG. 3B shows the second phase Vb of the voltage selected as the phase reference element, and other electric quantity elements are shown in a delayed phase display with respect to Vb. FIG. 3C shows the phase reference element. The first phase Ia of the current is selected as an element, and the other electric quantity elements are indicated by a delayed phase display with respect to Ia. 3A to 3C, among the codes that specify individual electric quantity elements, the rectangular display region 12 that includes the codes that specify the phase reference elements is indicated by bold letters in the figure. Although it is shown with a surrounding line, it is actually displayed in a highlighted manner in a display format such as using a color different from other parts. In this case, the display area 12 is information for specifying the phase reference element, and corresponds to the phase reference element specifying information in the present invention.

  According to the first embodiment as described above, an arbitrary electric quantity element is selected as a phase reference element for phase display in accordance with the designation from the user, and the phase of this phase reference element is used as a reference for other As for the electric quantity element, phase display data for displaying the difference from the phase of the phase reference element can be created. Therefore, the phase of the electric quantity as intended by the operator who is the user is displayed on the input electric quantity display screen 11. Display can be performed flexibly. That is, since the phase reference element can be freely selected, flexible handling and effective use of display data can be realized.

  Further, even when a sufficient effective value cannot be obtained for any selected phase reference element, phase display can be performed normally by selecting another electric quantity element as a new phase reference element. Furthermore, by highlighting the display area 12 including the code for identifying the phase reference element in a display format such as color coding, when the operator who is the user confirms the display contents, which element is displayed in the phase display. It is possible to provide an input electric quantity display screen 11 that can easily recognize whether it is a reference and is easier to understand and handle.

[Modification of First Embodiment]
Further, as a modification of the first embodiment, the phase display data creation unit 9c performs a lead phase display in which the lead direction is positive and a delay phase display in which the delay direction is positive with respect to the phase of the phase reference element. It is also possible to additionally display a certain phase display direction type indicating which phase display direction is on the input electric quantity display screen 11. In the input electric quantity display screen 11 of FIG. 4, as an example of such a phase display direction type, a character string 13a of “phase is delayed display” is added to clearly indicate that the positive phase display direction is the delay direction. Is displayed.

  In this way, by specifying the phase display direction type such as the character string 13a on the screen, the input electric quantity display screen 11 that is easier to understand and handle when the operator as the user confirms the display content. Can be provided.

[Second Embodiment]
FIG. 5 is a block diagram showing a display device of the digital protection control device according to the second embodiment to which the present invention is applied. As shown in FIG. 5, the second embodiment is a modification of the arithmetic processing unit 9 in the first embodiment, and based on the phase reference element selected by the phase reference selection unit 9b, the phase calculation unit The relative phase of other electric quantity elements based on the phase reference element is calculated by 9a. Other configurations are the same as those in the first embodiment.

  FIG. 6 is a flowchart showing an outline of the operation of the display device 1 shown in FIG. In FIG. 6, the electric quantity input (S610), the electric quantity digital conversion (S620), the display data creation process (S630), and the phase display data screen display (S640) are the steps in which the last two digits in FIG. These correspond to S210, S220, S230, and S240, respectively. Only a part of the display data creation process (S630) is different from the display data creation process (S230) of FIG.

  That is, in the arithmetic processing unit 9 of the second embodiment, as the display data creation process (S630), before calculating the phase, the phase reference selection unit 9b specifies some electric quantity element as the phase reference element by the user. (S631), the selected electric quantity element or the default electric quantity element is selected as the phase reference element according to whether or not the electric quantity element is specified (S632, S633). The series of operations (S631 to S633) for selecting the phase reference element by determining whether or not the electric quantity element is specified in this way is the same as the series of operations (S232 to S234) in FIG.

  In the second embodiment, after such a phase reference element is selected, the phase calculation unit 9a uses the phase of the selected phase reference element as a reference, and for each other electric quantity element, the phase reference element The relative phase with respect to the phase of the element is calculated (S634). Then, the phase display data creation unit 9c creates phase display data based on the selected phase reference element and the calculated relative phase (S635).

  In the second embodiment as described above, the procedure of the display data creation process is different from that of the first embodiment, but the obtained effect is exactly the same as that of the first embodiment.

[Third Embodiment]
FIG. 7 is a block diagram showing a display device of a digital protection control device according to a third embodiment to which the present invention is applied. As shown in FIG. 7, in the third embodiment, the arithmetic processing unit 9 in the first embodiment displays the advance phase display and the delay direction as positive with respect to the phase of the phase reference element. The advance / delay selection unit (advance / delay selection means) 9d for selecting which phase display of the delayed phase display to be performed is added. The phase display data creation unit 9c additionally displays a phase display direction type indicating the selected phase display direction on the input electric quantity display screen 11. Other configurations are the same as those in the first embodiment.

  FIG. 8 is a flowchart showing an outline of the operation of the display device 1 shown in FIG. In FIG. 8, the electric quantity input (S810), the electric quantity digital conversion (S820), the display data creation process (S830), and the phase display data screen display (S840) are the steps in which the last two digits in FIG. These correspond to S210, S220, S230, and S240, respectively. Only a part of the display data creation process (S830) is different from the display data creation process (S230) of FIG.

  First, as the display data creation process (S830), the arithmetic processing unit 9 of the third embodiment calculates the absolute phase of each electric quantity element, determines whether or not the electric quantity element is specified, and selects the phase reference element. The series of operations (S831 to S834) up to is the same as the series of operations (S231 to S234) in FIG. In the third embodiment, after such a phase reference element is selected, whether the phase display direction of the advance phase display or the delay phase display is designated by the advance / delay selection unit 9d from the user. It is determined whether or not (S835).

  When the phase display direction is designated (YES in S835), the advance / delay selection unit 9d selects the designated phase display direction (S836), and when there is no designation from the user (NO in S835). ), A phase display direction (for example, delayed phase display) set in advance as a default value is selected (S837). Subsequently, the phase display data creation unit 9c includes the phase display data of the selected phase display direction based on the calculated absolute phase and the selected phase reference element, including the phase display direction type indicating the phase display direction. (S838).

  FIG. 9 is a diagram showing a screen example in which the phase display data including the phase display direction type is displayed as the input electric quantity display screen 11 by the display unit 10 in the third embodiment, and the screen example shown in FIG. Similarly, the phase difference and the effective value are displayed for the three-phase voltage elements Va, Vb, and Vc and the three-phase current elements Ia, Ib, and Ic, respectively. In this example, the first phase Va of voltage is selected as the phase reference element on the input electric quantity display screen 11, and for the other electric quantity elements, the relative phase of each electric quantity element with respect to Va is advanced with respect to the phase of Va. Shown in phase display. In addition, in the input electric quantity display screen 11 of FIG. 9, a character string 13a of “phase is advanced display” is added as a phase display direction type to clearly indicate that the positive phase display direction is the advance direction. It is displayed.

  According to the third embodiment as described above, in addition to the same effects as those of the first embodiment, the following effects are further obtained. According to the specification from the user, either the phase display direction of the lead phase display or the delay phase display is selected, and the phase display data of the selected phase display direction includes the phase display direction type indicating the phase display direction. Therefore, the advanced phase display or the delayed phase display as intended by the user operator can be flexibly performed on the input electric quantity display screen 11. That is, since either the leading phase display or the lagging phase display can be freely selected, more flexible handling and more effective use of the display data can be realized.

  Further, by clearly indicating the phase display direction type such as the character string 13a on the screen, it is possible to provide the input electric quantity display screen 11 that is easier to understand and handle when the operator who is the user confirms the display contents. .

[Fourth Embodiment]
FIG. 10 is a block diagram showing a display device of the digital protection control device in the fourth embodiment to which the present invention is applied. As shown in FIG. 10, in the fourth embodiment, a phase reference element storage unit 9e that stores the phase reference element selected by the phase reference selection unit 9b is added to the arithmetic processing unit 9 in the first embodiment. It is what. Further, the phase display data creating unit 9c inputs the phase display direction type indicating whether the phase display data is the leading phase display or the delayed phase display, and the phase reference specifying information for specifying the stored phase reference element. An electric quantity display screen 11 is additionally displayed. Other configurations are the same as those in the first embodiment.

  FIG. 11 is a flowchart showing an outline of the operation of the display device 1 shown in FIG. In FIG. 11, the electric quantity input (S1110), the electric quantity digital conversion (S1120), the display data creation process (S1130), and the phase display data screen display (S1140) are the steps in which the last two digits in FIG. These correspond to S210, S220, S230, and S240, respectively. Only a part of the display data creation process (S1130) is different from the display data creation process (S230) of FIG.

  First, as the display data creation process (S1130), the arithmetic processing unit 9 of the fourth embodiment calculates the absolute phase of each electric quantity element, determines the presence or absence of designation of the electric quantity element, and selects the phase reference element. The series of operations (S1131 to S1134) up to is the same as the series of operations (S231 to S234) in FIG. In the fourth embodiment, after such a phase reference element is selected, the phase reference element storage unit 9e stores phase reference specifying information for specifying the selected phase reference element (S1135). Subsequently, based on the calculated absolute phase and the selected phase reference element by the phase display data creation unit 9c, the phase display data of the selected phase display direction is converted into the phase display direction type and phase indicating the phase display direction. It is created including phase reference specifying information for specifying a reference element (S1136).

  FIG. 12 is a diagram showing a screen example in which the phase display data including the phase display direction type and the phase reference specifying information is displayed as the input electric quantity display screen 11 by the display unit 10 in the fourth embodiment. Similarly to the screen example shown in Fig. 4, the phase difference and the effective value are displayed for the three-phase voltage elements Va, Vb, Vc and the three-phase current elements Ia, Ib, Ic, respectively. In this example, on the input electric quantity display screen 11, the first phase Va of voltage is selected as the phase reference element, and for the other electric quantity elements, the relative phase with respect to Va of each electric quantity element is set to the delay with respect to the phase of Va. Shown in phase display. In addition, in the input electric quantity display screen 11 of FIG. 12, a character string 13a of “phase is delayed display” is added as a phase display direction type to clearly indicate that the positive phase display direction is the delayed direction. In addition to the display, as the phase reference specifying information, a character string 13b “phase reference is Va” that clearly indicates that the phase reference element is Va is additionally displayed.

  Further, in the screen example shown in FIG. 12 and the like, the case where all the electric quantities are displayed on a single screen has been described in order to simplify the description, but actually, depending on various application conditions, There are cases where the input electric quantity display screen for displaying all electric quantities is a plurality of screens displayed by the screen switching method. FIG. 13 and FIG. 14 are diagrams respectively showing different screen examples when displaying all the electric quantities on the plurality of input electric quantity display screens.

  First, FIG. 13 is a diagram showing a screen example of a plurality of input electric quantity display screens 11a and 11b when applied to a busbar protection device. That is, the busbar protection device handles the amount of electricity of a large number of power transmission lines connected to the busbar, and since it is necessary to display all of these, a plurality of input electricity amount display screens are also required. In the example of FIG. 13, on the first input electric quantity display screen 11a, the three-phase voltage elements Va, Vb, Vc and the three-phase current elements 1LIa, 1LIb, 1LIc are displayed, and the second input electric quantity display. On the screen 11b, three-phase current elements 2LIa, 2LIb, and 2LIc and other three-phase current elements 3LIa, 3LIb, and 3LIc are displayed. Both character strings 13a and 12b indicating the phase display direction type and the phase reference specifying information are additionally displayed on both the input electric quantity display screens 11a and 11b.

  FIG. 14 is a diagram showing a screen example of a plurality of input electric quantity display screens 11a and 11b when the dimensions of the display screen itself are small. This example shows a case where the display of one screen is limited to three lines. In the first input electric quantity display screen 11a, the three-phase voltage elements Va, Vb, Vc are displayed, and On the second input electric quantity display screen 11b, three-phase current elements Ia, Ib, and Ic are displayed. Both character strings 13a and 12b indicating the phase display direction type and the phase reference specifying information are additionally displayed on both the input electric quantity display screens 11a and 11b.

  According to the fourth embodiment as described above, the following effects can be obtained in addition to the same effects as those of the first embodiment. That is, by specifying phase reference specifying information such as the character string 13b on the screen, the operator who is the user can easily recognize which element is the reference for phase display when checking the display contents. It is possible to provide an input electric quantity display screen 11 that can be more easily understood and handled. Further, since the phase display direction type such as the character string 13a is clearly shown on the screen, the input electric quantity display screen 11 can be made easier to understand and handle.

  In particular, when all electric quantities are displayed using a screen switching method using a plurality of input electric quantity display screens, for example, even when the phase reference element is not displayed on the displayed screen, the phase reference is specified. By displaying the information, the operator who is the user can always check the current phase reference element on the screen. For example, in FIG. 13, when the screen is switched from the first input electricity display screen 11a to the second input electricity display screen 11b, the second input electricity display screen 11b displays the current phase reference. The first phase Va of the voltage that is an element is not displayed, but since the character string 13b “phase reference is Va” indicating the phase reference specifying information is displayed, even on the second input electric quantity display screen 11b, It can be easily confirmed that the current phase reference element is the first phase Va of the voltage.

[Fifth Embodiment]
FIG. 15 is a block diagram showing a display device of a digital protection control device according to a fifth embodiment to which the present invention is applied. As shown in FIG. 15, the fifth embodiment is obtained by adding a phase reference switching unit 9f and an effective value calculation unit 9g to the arithmetic processing unit 9 in the first embodiment. Here, the effective value calculating unit 9g is a part that calculates the effective value of the current phase reference element, and the phase reference switching unit 9f is such that the effective value from the effective value calculating unit 9g is equal to or less than a predetermined value set in advance. In some cases, the phase reference element is automatically switched to another phase or another quantity of electricity. When the effective value is equal to or less than the predetermined value, there are various cases such as a grid fault, equipment stoppage, transformer failure, and the like. Here, a case of a grid fault will be described as an example.

  The phase display data creation unit 9c also includes a phase display direction type indicating whether the phase display data is a lead phase display or a delayed phase display, and phase reference specifying information for specifying a current or pre-accident phase reference element. In addition, it is additionally displayed on the input electric quantity display screen 11. Other configurations are the same as those in the first embodiment.

  FIG. 16 is a flowchart showing an outline of the operation of the display device 1 shown in FIG. In FIG. 16, the electric quantity input (S1610), the electric quantity digital conversion (S1620), the display data creation process (S1630), and the phase display data screen display (S1640) are the steps in which the last two digits in FIG. These correspond to S210, S220, S230, and S240, respectively. Only a part of the display data creation process (S1630) is different from the display data creation process (S230) of FIG.

  First, as the display data creation process (S1630), the arithmetic processing unit 9 of the fifth embodiment calculates the absolute phase of each electric quantity element, determines whether or not the electric quantity element is specified, and selects the phase reference element. The series of operations (S1631 to S1634) up to is the same as the series of operations (S231 to S234) in FIG. In the fifth embodiment, when a system fault occurs after selecting such a phase reference element (YES in S1635), the effective value calculation unit 9g causes the current phase reference element to be effective at the time of the fault. The value is calculated and the result is given to the phase reference switching unit 9f (S1636). In addition, although FIG. 16 has demonstrated the case of a system | strain accident, it is not limited to this. That is, the determination element in step S1635 in FIG. 16 corresponds to various elements whose effective values are equal to or less than a predetermined value, such as equipment stoppages, transformers, and the like, in addition to system faults.

  The phase reference switching unit 9f automatically switches the phase reference element to another phase or another electric quantity when the effective value from the effective value calculating unit 9g is equal to or less than a predetermined value set in advance (YES in S1637). To the phase display data creation unit 9c (S1638). In the normal time (NO in S1635), the phase reference switching unit 9f supplies the phase reference data selected by the phase reference selection unit 9b to the phase display data creation unit 9c as it is.

  Based on the calculated absolute phase and the given phase reference element, the phase display data creation unit 9c obtains the phase display data from the phase display direction type indicating the phase display direction and the phase reference specifying information for specifying the phase reference element. It is created including it (S1639).

  FIG. 17A is a diagram showing an example of a screen in which phase display data of an accidental electricity quantity is displayed as an input electricity quantity display screen 11 by the display unit 10 in the fifth embodiment, which is shown in FIG. Similarly to the screen example, phase differences and effective values are displayed for the three-phase voltage elements Va, Vb, Vc and the three-phase current elements Ia, Ib, Ic, respectively. In this screen example, the original phase reference element is the first phase Va of the voltage, but the accident phase is the first phase and the effective value at the time of the accident of the phase reference element is less than or equal to the predetermined value. The element is automatically switched to the second phase Vb of the voltage, and the other electric quantity elements are displayed with Vb as a reference and the delayed phase as positive.

  In addition, in the input electric quantity display screen 11 in FIG. 17A, as in the screen examples of FIGS. 12 to 14, it is clearly shown that the phase display direction to be positive is the delay direction as the phase display direction type. A character string 13a of “phase is delayed display” is additionally displayed, and a character string 13b of “phase reference is Vb” which clearly indicates that the phase reference element is Vb is additionally provided as phase reference specifying information. Is displayed.

  According to the fifth embodiment as described above, in addition to the same effects as those of the first embodiment and the same effects as those of the fourth embodiment, the following effects are further obtained. can get. That is, the accidental effective value of the phase reference element is calculated using the accidental input electric quantity of the phase reference element, and if the effective value is equal to or less than the predetermined value, the phase reference element is automatically switched to another phase or other electric quantity, Because phase display data based on the phase of the phase reference element after switching can be created and displayed on the screen, for example, the accident phase and the phase reference element overlap, and the effective value of the phase reference element is zero or very small Even in such a case, it is possible to appropriately display the phase of the electric quantity at the time of the accident.

  FIG. 17B shows another screen example in the fifth embodiment, in which the phase display data of the electric quantity at the time of the accident is input using the first phase Va of the voltage, which is the phase reference element before the accident, as the phase reference element. FIG. 6 is a diagram showing an example of a screen displayed as an electric quantity display screen 11. In the screen example of FIG. 17B, “phase reference is pre-accident Va” that clearly indicates that the first phase Va of the voltage before the accident is adopted as the phase reference specifying information for specifying the phase reference element. Is displayed. As described above, the method of using the voltage before the accident as a phase reference element when displaying the electric quantity at the time of the accident is one of the useful techniques for analyzing the accident.

[Other Embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and various other variations can be implemented within the scope of the present invention. For example, it is obvious that the same effect can be obtained when each of the third to fifth embodiments is combined with the second embodiment. Further, when the third to fifth embodiments are additively combined, a synergistic effect obtained by adding the effects of those embodiments is obtained.

  In the present invention, the screen configuration and display format of the screen example shown in FIG. 3 and the like are merely examples, and the specific screen configuration and display format of the display screen can be freely selected. For example, the display format of the position / direction type and the phase reference specifying information is not limited to a character string, and can be freely selected from various marks and symbols, or a character string and a combination thereof. It is also conceivable to use methods such as color coding and blinking in order to visually emphasize the position display type and phase reference specifying information.

The block diagram which shows the display apparatus of the digital type protection control apparatus in 1st Embodiment to which this invention is applied. 3 is a flowchart showing an outline of the operation of the display device 1 shown in FIG. The figure which shows the example of a screen which displayed phase display data as an input electric quantity display screen by the display part shown in FIG. The figure which shows the example of a screen which displayed the phase display data containing a phase display direction classification as an input electric quantity display screen by the display part shown in FIG. The block diagram which shows the display apparatus of the digital type protection control apparatus in 2nd Embodiment to which this invention is applied. The flowchart which shows the outline | summary of operation | movement of the display apparatus shown in FIG. The block diagram which shows the display apparatus of the digital type protection control apparatus in 3rd Embodiment to which this invention is applied. The flowchart which shows the outline | summary of operation | movement of the display apparatus 1 shown in FIG. The figure which shows the example of a screen which displayed the phase display data containing a phase display direction classification as an input electric quantity display screen by the display part shown in FIG. The block diagram which shows the display apparatus of the digital type protection control apparatus in 4th Embodiment to which this invention is applied. 11 is a flowchart showing an outline of the operation of the display device shown in FIG. The figure which shows the example of a screen which displayed the phase display data containing a phase display direction classification and phase reference specific information as an input electric quantity display screen by the display part shown in FIG. FIG. 11 is a diagram showing a screen example of a plurality of input electric quantity display screens when the digital protection control device shown in FIG. 10 is applied to a busbar protection device. The figure which shows the example of a screen of the some input electric quantity display screen in case the dimension of the display screen itself of the display part shown in FIG. 10 is small. The block diagram which shows the display apparatus of the digital protection control apparatus in 5th Embodiment to which this invention is applied. The flowchart which shows the outline | summary of operation | movement of the display apparatus shown in FIG. The figure which shows the example of a screen which displayed the phase display data of the electric quantity at the time of an accident as an input electric quantity display screen by the display part shown in FIG. The figure which shows the example of a screen of the input electric quantity display screen displayed by the conventional digital form protection control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Display apparatus 2 ... Bus 3 ... Transformer 4 ... Power transmission line 5 ... Current transformer 6 ... Input converter 7 ... Analog / digital converter 8 ... Digital signal 9 ... Arithmetic processing part 9a ... Phase calculation part 9b ... Phase reference Selection unit 9c ... Phase display data creation unit 9d ... Advance / lag selection unit 9e ... Phase reference element storage unit 9f ... Phase reference switching unit 9g ... Effective value calculation unit 10 ... Display units 11, 11a, 11b ... Input electric quantity display screen 12 ... display area 13a, 13b ... character string

Claims (11)

In a digital protection control apparatus for inputting a plurality of types of electricity having a predetermined fundamental frequency and displaying the electricity quantity data after analog / digital conversion at a predetermined sampling frequency,
Phase calculating means for calculating a phase for each of the plurality of types of electric quantity elements;
Phase reference selection means for selecting an arbitrary electric quantity element as a phase reference element for phase display from among the plurality of types of electric quantities according to designation from the user;
Based on the calculated phase and the selected phase reference element, with respect to the phase of the phase reference element, with respect to other electric quantity elements, phase display data for displaying a difference from the phase of the phase reference element is displayed. Phase display data creation means to create and display on the screen,
A digital protection control device comprising: The phase calculating means is configured to calculate an absolute phase of each electric quantity element,
The phase display data creating means is configured to create the phase display data based on the calculated absolute phase.
2. The digital protection control device according to claim 1, wherein The phase calculation means is configured to calculate a relative phase with respect to the phase of the phase reference element, with respect to the phase of the selected phase reference element, and for other electric quantity elements.
The phase display data creation means is configured to create the phase display data based on the calculated relative phase.
2. The digital protection control device according to claim 1, wherein The phase display data creation means determines which of the phase display directions of the advance phase display in which the advance direction is positive and the delay phase display in which the delay direction is positive with respect to the phase of the selected phase reference element. It is configured to display the phase display direction type to be displayed on the screen.
4. The digital protection control apparatus according to claim 1, wherein the digital protection control apparatus is a digital protection control apparatus. According to the designation from the user, it is selected whether to display the phase of the selected phase reference element, the leading phase display with a positive lead direction or the delayed phase display with a positive lag direction. A forward / delay selection means,
The phase display data creating means is configured to create the phase display data based on the selected leading phase display or delayed phase display.
5. The digital protection control device according to claim 1, wherein the digital protection control device is a digital protection control device. The phase display data creating means is configured to display phase reference specifying information for specifying the selected phase reference element on the screen.
6. The digital protection control device according to claim 1, wherein the digital protection control device is a digital protection control device. An effective value calculating means for calculating an effective value of the selected phase reference element;
When the calculated effective value is equal to or less than a predetermined value set in advance, a phase reference switching unit that automatically switches the phase reference element to another electric quantity element,
7. The digital protection control device according to claim 1, further comprising: In a display data creation method of a digital protection control device for inputting a plurality of types of electricity having a predetermined basic frequency and displaying the electricity data after analog / digital conversion at a predetermined sampling frequency,
An absolute phase calculating step of calculating an absolute phase for each electric quantity element of the plurality of types of electric quantities;
A phase reference selection step of selecting an arbitrary electric quantity element as a phase reference element for phase display from the plurality of types of electric quantities in accordance with designation from the user;
Based on the calculated absolute phase and the selected phase reference element, the phase indicating the difference between the absolute phase of the phase reference element with respect to the other electrical quantity elements with the absolute phase of the phase reference element as a reference Phase display data creation step for creating display data and displaying it on the screen,
A display data creation method for a digital protection control device, comprising: In a display data creation method of a digital protection control device for inputting a plurality of types of electricity having a predetermined basic frequency and displaying the electricity data after analog / digital conversion at a predetermined sampling frequency,
A phase reference selection step of selecting an arbitrary electric quantity element as a phase reference element for phase display from the plurality of types of electric quantities in accordance with designation from the user;
Relative phase calculation step for calculating the relative phase with respect to the phase of the phase reference element for the other electric quantity elements with respect to the phase of the selected phase reference element for each of the plurality of types of electric quantity elements When,
Based on the calculated relative phase and the selected phase reference element, with reference to the phase of the phase reference element, phase display data for displaying the relative phase is created on the screen for the other electric quantity elements. Phase display data creation step to be displayed,
A display data creation method for a digital protection control device, comprising: Display data of a digital protection control device that uses a digital arithmetic processing means to input a plurality of types of electric quantities having a predetermined fundamental frequency and display the electric quantity data after analog / digital conversion at a predetermined sampling frequency In the creation program,
An absolute phase calculating function for calculating an absolute phase for each electric quantity element of the plurality of types of electric quantities;
A phase reference selection function for selecting an arbitrary electric quantity element as a phase reference element for phase display from among the plurality of types of electric quantities in accordance with designation from the user;
Based on the calculated absolute phase and the selected phase reference element, the phase indicating the difference between the absolute phase of the phase reference element with respect to the other electrical quantity elements with the absolute phase of the phase reference element as a reference Phase display data creation function to create display data and display it on the screen,
Is realized by the digital arithmetic processing means. A display data creation program for a digital protection control device. Display data of a digital protection control device that uses a digital arithmetic processing means to input a plurality of types of electric quantities having a predetermined fundamental frequency and display the electric quantity data after analog / digital conversion at a predetermined sampling frequency In the creation program,
A phase reference selection function for selecting an arbitrary electric quantity element as a phase reference element for phase display from among the plurality of types of electric quantities in accordance with designation from the user;
Relative phase calculation function for calculating the relative phase with respect to the phase of the phase reference element for the other electric quantity elements with respect to the phase of the selected phase reference element for each of the plurality of types of electric quantity elements When,
Based on the calculated relative phase and the selected phase reference element, on the screen, phase display data for displaying the relative phase is created for other electric quantity elements based on the phase of the phase reference element. Phase display data creation function to display,
Is realized by the digital arithmetic processing means. A display data creation program for a digital protection control device.

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