JP4028501B2 - Digital protective relay device - Google Patents

Description

  The present invention relates to a digital protection relay device that performs a protection operation based on the amount of electricity in a power system.

  In general, a digital protective relay device has a display device composed of a liquid crystal panel or a CRT disposed at the upper front portion thereof, and a light emitting diode indicator lamp, various push button type operation switches, or an interface cable connector at the lower portion of the display device. Etc. are arranged.

  In the conventional digital protection relay device, considering the power saving and long life, the display device is always in the non-display state, and when the accident to be protected is detected from the input electric quantity, or the digital protection by self-inspection When it is detected that there is an abnormality in the relay device itself, a corresponding indicator light among the indicator lights is turned on to notify the operator. When investigating the cause of lighting of the indicator lamp, the operator must operate the operation switch to activate the display device and open a screen for displaying necessary information (for example, see Patent Document 1).

In digital protective relay devices, it is common practice to limit the number of switches that can be operated by attaching a front cover during operation so that the operation switches are not inadvertently operated. Therefore, in order to display the operating state on the display screen of the display device, it is necessary to remove the front cover and perform a predetermined switch operation.
JP 2002-262446 A (page 3, FIGS. 1 and 2)

  Since the number of indicator lights and their arrangement depend on the hardware of the digital protection relay device, when changing the number of indicator lights and their arrangement, change the related display control hardware.・ Remodeling was necessary. However, even with this hardware change / modification, the number and position of indicator lights are naturally limited, and the number and position of indicator lights cannot be freely implemented.

  Therefore, an alternative measure using a screen such as a flat display without using an indicator as a display means can be considered, but the conventional status display screen is not supposed to be displayed during operation in principle, and is in operation. Could not be displayed by operating the switch from the outside. Further, in the invention described in Patent Document 1, the logical operation output of any past operation signal or abnormal signal cannot be displayed. An alternative treatment using such a display screen could not be easily performed.

  Therefore, the object of the present invention has been made in view of the above circumstances, and by displaying a virtual indicator lamp having a function equivalent to or higher than that of an indicator lamp on the display screen, the number of display points, arrangement, etc. It is an object of the present invention to provide a digital protection relay device that can freely set a display form and can create a display screen of a logical operation output according to the display form.

In order to achieve the above object, the invention of a digital protection relay device according to claim 1 is a digital protection relay device that performs a protection operation based on an electric quantity of a power system. A signal selection means for selecting an internal signal such as a signal or an abnormal signal, a logical operation means for inputting an internal signal selected by the signal selection means, processing and outputting by an arbitrary logical operation, and a logical operation means Display form setting means for setting at least one of a notation character of a virtual indicator lamp displayed on the virtual indicator lamp screen and a supplementary wording of the virtual indicator lamp together with a virtual indicator lamp screen indicating ON / OFF of the obtained logical operation output When the screen creation means for creating a virtual display lamp screen determined by the display form setting means, the virtual display lamp screen created by the screen creation unit, or external A screen display unit which is displayed on the basis of the operable operation of viewing the switch, characterized by comprising a.

  According to the present invention, the display form setting means can give sufficient flexibility and expandability to the virtual indicator lamp screen of the logical operation output of any operation signal or abnormal signal of the digital protection relay device, and An operator who patrols the digital protective relay device can display information related to the logical operation output on the display screen by a viewing switch that can be operated from the outside.

  In addition, it is possible to display many operation signals and abnormality signals of the digital protection relay device without requiring hardware development cost of the digital protection relay device.

  Embodiments of the present invention will be described below with reference to the drawings. Throughout the drawings, common parts are denoted by the same reference numerals, and redundant description is omitted.

Example 1
A digital protection relay device according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view of the digital protective relay device 1. The digital protective relay device 1 has a liquid crystal panel display section (hereinafter referred to as a display section 2) at the upper front portion thereof, and a viewing switch 3, an initialization switch 4 and operation switches for performing various operations on the lower right side thereof. 5 are arranged in a line. A plurality of indicator lamps 6 made of light emitting diodes (LEDs) are arranged in a line on the lower left side of the display unit 2.

  Then, by operating the switches 3 to 5 described above, various types of information on the power system are displayed on the display unit 2, and the relay settling value can be changed and the recorded information can be browsed. Some of the plurality of indicator lamps 6 are assigned for logical operation output of arbitrary operation signals or abnormal signals of the digital protection relay device, and the indicator lamps are turned ON / OFF according to each output state To do.

  FIG. 2 is a plan view of the front cover 7 attached to the front surface of the digital protective relay device 1. The front cover 7 is attached to prevent erroneous operation of the operation switch 5 and to improve the durability of the digital protective relay device. It is comprised with the transparent glass plate or the acrylic board so that the lighting condition of 6 and the state of the operation switch 5 can be confirmed. In addition, the front cover 7 is pressed to a position facing the switches 3 and 4 so that the browsing switch 3 and the initialization switch 4 can be operated with the front cover of the digital protective relay device 1 being mounted. A notch portion 8 is provided. As a matter of course, the operation of the operation switch 5 can be performed only after the front cover 7 is removed.

FIG. 3 is a diagram showing an outline of transition of display information on the display screen of the display unit 2.
When a protective relay (not shown) is activated and the display screen 200 of the display unit 2 is in the blank screen 2A state, when the initialization switch 4 or the operation switch 5 other than the viewing switch 3 is pressed, the display screen 200 of the display unit 2 is displayed. Changes from the blank screen 2A to the menu screen 2B. Thereafter, the setting change screen 2C and the recording information screen 2N are developed by operating any one of the switches 4 or 5 other than the viewing switch 3, and the program is configured so that they can be browsed.

  On the other hand, when the browsing switch 3 is pressed once in the blank screen 2A state, the browsing-only first screen 2E1, which is the browsing-only top screen, of the browsing-only screen 2E assuming browsing at the time of patrol is transitioned to. If the viewing switch 3 is further pressed once again in the 2E1 state, the viewing-only screen 2E transitions to the second screen 2E2. Similarly, every time the viewing switch 3 is pressed, the browsing-only screen 2E sequentially changes, reaches the browsing-only final screen 2EN, and cycles again to the browsing-only first screen 2E1. In this operation, the front cover 7 is provided with the switch pressing notch portion 8 as described above, so that the browsing switch 3 can be pressed without removing the front cover 7, and the browsing switch 3 is pressed. Each time it is done, the browsing-only screen 2E can be browsed sequentially like 2E1, 2E2,... 2EN, 2E1.

FIG. 4 is a functional configuration diagram for explaining a screen display function which is a main part of the first embodiment.
This functional configuration diagram is configured assuming a general voltage relay as a protective relay in order to facilitate understanding of the invention.

  In FIG. 4, the signal selection means 11 selects an internal signal used for screen display, and is configured to input an internal signal such as an operation signal or an abnormal signal output from a protective relay arithmetic unit (not shown). . Examples of this internal signal include A phase trip output, B phase trip output, C phase trip output, three-phase balanced monitoring output, minor fault output, overvoltage relay output, undervoltage relay output, and major fault output. It is a signal obtained by.

  Of these internal signals, the A-phase trip output, the B-phase trip output, the C-phase trip output, the overvoltage relay output, and the undervoltage relay output are input to the logic operation means 12 provided in the next stage. Has been.

  This logical operation means 12 has a function of assigning an input and an output, and among three input internal signals, three trip outputs (A-phase trip output to C-phase trip output) are OR operators. 121 is output as one “signal 1”, and the other internal signals, that is, the overvoltage relay output and the undervoltage relay output, are directly output as “signal 2” and “signal 3” without performing logical operation. To function. In the following description, when the type of the signal output from the logic operation means 12 is not specified, the signal 13 is simply described. This signal is displayed on the display screen 200 by being input to the screen creation means 14.

  The display form setting means 15 can set the means 15A for enabling the selection of notation characters to be used for the virtual indicator lamp, the means 15B for displaying the supplementary wording of the logical operation output obtained by the logical operation means 12, and the number of display points of the virtual indicator lamp. 15C is provided.

  FIG. 5 is a diagram illustrating an example of the signal display screen 200-1 displayed on the display unit 2. The signal display screen 200-1 of FIG. 5 shows internal signals “SIG 1”, “SIG 2”, “SIG 3” and their respective signal numbers 51. In this example, specific numbers of the signal number 51 are “119”, “43”, and “16”.

  FIG. 6 is a diagram showing an example of a display mode setting screen 200-2 displayed on the display unit 2. As shown in FIG. On the display form setting screen 200-2 of FIG. 6, the display point setting means 15C sets the display point 61 (3) of the virtual indicator lamp by numerical input, and the notation character selection means 15A virtually displays from the notation character candidate 62. Select the light notation characters (◆, ◇, *, #, 1, 0, ☆) and make the logical operation output 13 obtained by the logical operation means 12 ON corresponding to “◆” and OFF corresponding to “◇”. .

  The screen creation means 14 creates a display screen for displaying the logical operation output 13 obtained by the logical operation means 12. Here, the display screen 200-3 of the virtual indicator lamp in the form shown in FIG. 7 is created. According to the display form determined by the display form setting means 15, if the logical operation output 13 obtained by the logical operation means 12 is ON, "◆" is indicated, and if it is OFF, "◇" is indicated by the notation character 71 of each virtual indicator lamp. And “SIG 1” to “SIG 3” are added as supplementary words 72 of the virtual indicator lamp.

  The screen display means 16 positions the virtual indicator lamp display screen 200-3 shown in FIG. 7 in the screen hierarchy of the first screen 2E1, which is the browsing-only top screen in FIG. This screen can be displayed by pressing the viewing switch 3 once during the operation of the digital protective relay device 1 as described above. This means that even if the digital protective relay device 1 is in operation, the operator can display the virtual indicator lamp screen 200-3 with an extremely simple operation without removing the front cover.

As described above, according to the first embodiment, the display mode setting means 15 is sufficient for the virtual indicator lamp screen 200-3 of the logical operation output 13 of any operation signal or abnormal signal of the digital protection relay device 1. Flexibility and extensibility. In addition, the operator who patrols the digital protective relay device 1 can display the logical operation output 13 on the display screen 200 of the display unit 2 by pressing the viewing switch 3 without removing the front cover 7.
Furthermore, many operation signals and abnormal signals of the digital protection relay device 1 can be displayed without requiring the hardware development cost of the digital protection relay device 1.

  In the first embodiment described above, since a general voltage relay is described as an example, the logical operation output 13 outputs three types of “signal 1”, “signal 2”, and “signal 3”. In the case of other relays having a lot of internal signals, the types of logic operation outputs 13 are also increased. In this case, it is possible to add means for enabling the display form setting means 15 to set the display screen arrangement on the display section 2 of the virtual indicator lamp.

(Example 2)
Embodiment 2 of the digital protection relay device according to the present invention will be described.
The second embodiment is characterized in that an output holding unit 17 and a display initialization unit 18 are added between the logical operation unit 12 and the screen creation unit 14 of the first embodiment.

Since FIGS. 1 to 3 and FIGS. 5 to 7 are the same as those in the first embodiment, description thereof is omitted.
FIG. 8 is a diagram showing a display screen for setting whether or not to hold the logical operation output of the digital protection relay device according to the second embodiment of the present invention, and FIG. 9 shows an embodiment of the digital protection relay device according to the present invention. It is a figure which shows the display screen which sets the presence or absence of 2 logic operation output holding | maintenance.

  In FIG. 8, the output holding means 17 holds the logical operation output 13 of the logical operation means 12. From the logical product operator 19, a part of the flip-flop 20, the logical sum operator 21, and the latch selection switch 22. Composed. The display initialization means 18 initializes the logical operation output 13 and is composed of a switch 23, an on-delay timer 24, and a part of the flip-flop 20 that are input at the time of initialization.

  The output holding means 17 sets the presence / absence of a function for holding the display of each logical operation output 13 obtained from the logical operation means 12 (hereinafter referred to as a latch function) on the output holding selection screen 200-4 shown in FIG. . For each virtual indicator, the latch function is enabled when “Latch” shown in FIG. 9 is selected, and the latch function is disabled when “Instantaneous” is selected.

  That is, in the output holding means 17 in FIG. 8, when “Latch” is selected by the latch selection switch 22, the latch selection signal 81 becomes “1”, and the logical operation output of the logical operation means 12 is ON (“1”). When 13 is output, the set signal 82 output from the logical product operator 19 becomes “1”, and the signal 31 having the logical value “1” is output from the flip-flop 20. The logical operation output 13 and the output signal 83 of the flip-flop 20 are displayed on the screen creating means 14 via the logical sum operator 21 and the virtual indicator light notation “♦” corresponding to ON is displayed. After that, even if the logical operation output 13 is turned OFF, the reset signal 84 of the flip-flop 20 is unchanged at “0”, so the output signal 83 is unchanged at “1”, and the virtual indicator light “♦” is used. Latched.

  However, when “Instantaneous” is selected instead of “Latch” with the latch selection switch 22 of the output holding means 17, the logical product condition of the logical product operator 19 is not satisfied, so that the logical operation output 13 changes from ON to OFF. When changed, the reset signal 84 of the flip-flop 20 is “0” and is not changed, so that the virtual indicator light notation character follows the logic operation output 13 and the notation character “◆” corresponding to ON to the notation character “OFF” corresponding to OFF. ◇ "changes.

  As the display initialization means 18, the reset signal 84 is generated by continuously pressing down the initialization switch 23 during the setting time limit of the on-delay timer 24 while the virtual indicator lamp screen 200-3 is being displayed. 12 can be used to initialize the logical operation output 13 obtained.

  In other words, in the state where “Latch” is selected in the output holding means 6 and the logic operation output 23 is turned OFF after being turned ON, the virtual indicator light “♦” is continued by the output signal 31 of the flip-flop 20. In this case, by continuously pressing the initialization switch 23 of the display initialization means 18 for the settling time of the on-delay timer 24, it is possible to change to the virtual indicator light character “文字”. . This initialization operation can be performed very easily without the operator removing the front cover 7 even when the digital protective relay device is in operation.

As described above, according to the second embodiment, in addition to the operational effects of the first embodiment, not only the current but also held logical operation output 13 can be displayed on the display screen 200 of the display unit 2, and The display result can be initialized by an initialization switch 23 that can be operated from the outside. Thereby, the operator can check not only the present but also the past operation state of the internal signal. Further, the virtual indicator lamp screen 200-3 can be easily initialized during operation without requiring the temporary stop of the digital protective relay device 1 or the operation of removing the front cover 7.

(Example 3)
A third embodiment of the digital protective relay device according to the present invention will be described.
The third embodiment is characterized in that a screen activation unit 25 is newly added to the first embodiment. Since the other points are the same as those in the first embodiment, the description thereof is omitted.

  1 to 3 and FIGS. 5 to 7 are the same as those in the first embodiment, and thus the description thereof is omitted. In FIG. 10, reference numeral 25 denotes a screen starting means, which constantly monitors the signal state of the logical operation output 13, and changes the state of any signal ("signal 1" to "signal 3") of the logical operation output 13. In this case, it functions to call the screen display means 16. Thereby, even if the operator does not press down the viewing switch 3, the virtual indicator lamp screen 200-3 can be automatically popped up.

  As described above, according to the third embodiment, the virtual indicator lamp screen 200-3 is displayed on the display panel 2 without performing any external switch operation described in the first embodiment at the time of patrol. Can be displayed automatically. Thereby, an operator can confirm the operation state of the internal signal of the digital protection relay apparatus 1 visually.

  In each of the above-described embodiments, it has been described that the LDC using the liquid crystal is applied as the display unit. However, the present invention is not limited thereto, and for example, a display device such as a CRT or a plasma display (PDP) can be applied. it can.

1 is a front view of a digital protective relay device according to the present invention. The top view of the front cover for digital protection relay devices which concerns on this invention. The figure which shows the outline | summary of the transition of the display screen in this invention. The function block diagram explaining the screen display function of Example 1 of the digital protection relay apparatus which concerns on this invention. The figure which shows the signal selection screen of Example 1 of the digital protection relay apparatus which concerns on this invention. The figure which shows the display form setting screen of Example 1 of the digital protection relay apparatus which concerns on this invention. The figure which shows the display screen of the virtual indicator lamp of Example 1 of the digital protection relay apparatus which concerns on this invention. The function block diagram explaining the screen display function of the digital protection relay apparatus Example 2 which concerns on this invention. The figure which shows the display screen which sets the presence or absence of holding | maintenance of the logic operation output of Example 2 of the digital protection relay apparatus which concerns on this invention. The function block diagram explaining the screen display function of Example 3 of the digital protection relay apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Digital protective relay device, 2 ... Display part, 3 ... Browse switch, 4 ... Initialization switch, 5 ... Operation switch, 6 ... Indicator light, 7 ... Front cover, 8 ... Notch part for switch pressing, 11 ... Signal selection means, 12 ... logical operation means, 14 ... screen creation means, 15 ... display form setting means, 15A ... selection means for notation characters used for virtual indicator lamps, 15B ... supplementary word display means for logical operation output, 15C ... virtual Display lamp display point setting means, 16 ... screen display means, 17 ... output holding means, 18 ... display initialization means, 19 ... logical product operator, 20 ... flip-flop, 21 ... logical sum operator, 22 ... latch selection Switch 23... Initialization switch 24. On-delay timer 25.

Claims (5)

In the digital protection relay device that performs protection calculation based on the amount of electricity in the power system,
A signal selection means for selecting an internal signal such as an arbitrary operation signal or an abnormal signal of the digital protection relay device;
A logical operation means for inputting an internal signal selected by the signal selection means, processing and outputting by an arbitrary logical operation, and
Along with the virtual indicator light screen indicating ON / OFF of the logical operation output obtained by this logical operation means, at least one of the notation character of the virtual indicator light displayed on the virtual indicator light screen or the supplemental wording of the virtual indicator light is set. Display form setting means for
Screen creating means for creating a virtual indicator lamp screen determined by the display form setting means;
A screen display means for displaying the virtual indicator lamp screen created by the screen creation means based on the operation of a viewing switch operable from the outside ,
A digital protective relay device comprising:   2. The digital apparatus according to claim 1, further comprising: an output holding unit that holds a logical operation output obtained by the logical operation unit; and a display initialization unit that initializes an output obtained by the output holding unit. Protective relay device.   2. The digital protective relay device according to claim 1, further comprising a screen activation unit that calls the screen display unit when a logical operation output obtained by the logical operation unit changes. There is provided a screen activation unit that constantly monitors the signal state of the logical operation output and functions to call the screen display unit when the state of any signal of the logical operation output changes. The digital protective relay device according to claim 1. In the digital protective relay device, a display unit is arranged at an arbitrary part of the front part of the digital protective relay device, and a browsing switch and operation switches for performing various operations are arranged at other parts. Various information on the power system is displayed on the part, and the relay cover is changed, the recorded information is browsed, and the like. The digital protective relay device according to claim 1, wherein the digital protective relay device is mounted on a front surface of the unit.

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