JP2011139554A - Protective relay device and data display method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective relay device which easily checks relay operation in times series without significantly increasing display/editing processes in the protective relay device. <P>SOLUTION: The protective relay device includes: an A/D converter that converts an analog electric quantity input from a power system into a digital electric quantity; a relay computer that uses the digital electric quantity for relay operation; a sequence processor which outputs an operation command to a breaker, based on the relay operation results; a memory which detects the relay operation results or the operation command to the breaker as a trigger, and stores the digital electric quantity until a predetermined time elapses after the trigger is detected, in time series at every detection time point; and a display compiler which selects the digital electric quantity at the designated time point and displays it on a display unit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a digital protection relay device that protects a power system, and more particularly to a protection relay device that suitably displays data such as power system information and protection relay calculation results, and a display method thereof.

  For faults that occur in the power system, so-called short-circuits, ground faults, etc., protective relay devices installed for each element such as transmission lines, transformers, buses, and generators that form the power system are within the defensive range. The fault is removed by disconnecting the section including the fault point from the remaining healthy power system by tripping the circuit breaker. The protection relay device installed in the special high-voltage system operates in several cycles (approximately 40 ms), and the circuit breaker also operates in approximately 2 cycles. This is implemented by confirming voltage information and current information of the power system at the time of the failure or an operation record of the protection relay by a recording function built in the protection relay device.

  At present, digital relays that digitize the current and voltage information of the system and realize an algorithm for discriminating system faults by software processing are the mainstream.

  In general, in the protection relay device for extra high voltage, the current and voltage information of the electric power system is sampled at a cycle of 30 degrees electrical angle and 3.75 degrees for high speed devices. In digital relays, a data recording function can be realized relatively easily, so many products have a data recording function, and the voltage information and current information of the system that the relay captures from the system side for the calculation. Analog information such as system information, switch information on the system side and other equipment, calculation results of the relay itself, information on sequence processing, and the like are recorded at a cycle of 30 degrees or 3.75 degrees. As for the recording time, data that stores about 10 cycles of data for one event is the mainstream.

  The recorded data is read once from the device to a personal computer, etc., and the voltage and current information of the system recorded by the digital relay is drawn using an analysis tool, which is a dedicated software tool. Functions such as checking the degree, size, phase, and the like, comparing a signal indicating the operation state of the relay together with the waveform, and switch information indicating the state of the device in time series are provided.

  On the other hand, in the human interface (HI) part that digital relays are mounted as standard, or in the HI realized by a personal computer or the like, the effective value and phase of the data recording starting point and the relay operating state of the starting point are shown. It has not been realized, and waveform drawing or the like like the analysis tool is not realized. This is because the current mainstream of HI is limited to functions that can be realized by a standard wave browser without a special program on the personal computer side.

  For this reason, once an event that triggers data recording occurs, it is necessary to once read the recorded data from the relay side to the personal computer and perform analysis using a dedicated analysis program on the personal computer side, a so-called analysis tool. It is difficult to confirm details on a PC that does not have an analysis tool installed.

  In addition, when using an analysis tool, it is necessary to make settings according to the product from which data is to be read out, select information to be checked, etc., and it is difficult for only a person who is familiar with handling to read out the desired information. In reality, it takes a certain amount of time.

  To solve this problem, for example, as disclosed in Patent Document 1, there is a technique for selecting instantaneous value data continuous before and after a specific device operation time based on a selection range condition, and converting and displaying the data in graphic format. .

JP 2008-99442 A

  The prior art described above incorporates a function that has been performed by an analysis tool so far, such as displaying continuous data in a graphic format, into the HI. Therefore, there is a problem that it is necessary to mount an analysis program on the HI that converts the stored electric quantity data into a graphic format and displays the data as continuous data, which requires appropriate system resources.

  In view of the above-described problems, the present invention is to provide a protection relay device that can easily confirm relay operations in time series without significantly increasing the HI processing.

  The above problem is that A / D conversion means for A / D converting analog electricity input from the power system into digital electricity, and relay computation using the digital electricity output from the A / D conversion means. Relay calculating means for determining abnormality of the power system, sequence processing means for outputting an operation command to a circuit breaker connected to the power system based on a relay calculation result output from the relay calculating means, The relay calculation result or the operation command to the circuit breaker determined as a trigger is detected as a trigger, and the digital electric quantity from the trigger detection time to the elapse of a predetermined time is a plurality of samples at each conversion time of the A / D conversion. Memory means that is stored in time series and a sample corresponding to a specified time from the plurality of samples is selected and displayed on the display device. A display editing means for processing is solved by a protective relay device having a.

  According to the present invention, time-series data can be easily confirmed by adding functions without imposing a large processing burden on an existing human interface unit.

Display data selection circuit. Display point movement processing flow. Example of relay operation content display screen. Example of effective value / phase display screen of input electric quantity. An example of an instantaneous value display screen for input electricity. An example of the operation status display screen. Example of operation history screen. An example of the operation content display screen. The data processing block diagram of a protection relay apparatus. Data selection circuit from data save memory. Example of a constant data display screen of relay operation contents. An example of a constant data display screen for input electric quantity. An example of a constant data display screen in the operational state. Sample data structure example.

  FIG. 9 shows a data processing block diagram of a general protection relay device. The protection relay device takes in the voltage and current on the power system side, but is provided with an input transformer auxiliary transformer 101 that lowers the signal from the transformer PT110 and the current transformer CT109, and the transformer PT110 on the main machine side, the transformer. Connected with the fluency CT109.

  At the output side of the auxiliary transformer 101, the transformation ratio is such that a low voltage suitable for digitization is output. This output is connected to the analog filter 102. The analog filter 102 is for preventing aliasing errors that are generated by removing unnecessary frequency components or by digital conversion at the next stage. The analog signal from the analog filter 102 is sampled by the A / D converter 103 and converted into a digital signal. This digital signal is sent to the relay operation unit 104 in the next stage.

  The relay calculation unit 104 performs a relay calculation for determining a power system fault or the like based on the digital signal from the A / D converter 103, and the relay calculation result is further sent to the sequence processing unit 106. The sequence processing unit 106 performs sequence processing in combination with ON / OFF information acquired via an input circuit 105 that acquires ON / OFF states, switch states, and the like from devices and other devices, and then to the circuit breaker. A determination result as a relay device is output from an output circuit 107 that outputs a tripping command.

  In the recording data save memory 108, the output of the A / D converter 103, the relay calculation result from the relay calculation unit 104, the sequence processing result from the sequence processing unit 106, the state of the input circuit 105, etc. Save in time series in units such as relay calculation cycle and sequence calculation cycle. This storage process is performed using a change in the result of the relay operation, the result of the sequence operation, the state of the input circuit 105, or the like as a trigger. Saving the data before the occurrence of the trigger can be realized by providing the ring buffer 111 on the memory, recording it constantly, freezing it at the time of triggering, and storing it in the data save memory 108.

  A human interface (HI) processing unit 112 that performs display processing on the HI screen 115 includes a data display editing processing unit 113 and an HI screen display processing unit 114. The data display editing processing unit 113 selects time data to be displayed from various data stored in the data save memory 108, performs editing processing for display on the HI screen 115, and outputs the edited data to the HI screen display processing unit 114. . The HI screen display processing unit 114 performs display processing on the HI screen and displays it on the HI screen 115. In the HI screen display processing unit 114, the current operation such as the output of the A / D converter 103, the relay calculation result from the relay calculation unit 104, the sequence processing result from the sequence processing unit 106, the state of the input circuit 105, and the like. Data indicating the state can also be selected and displayed on the HI screen 115.

  FIG. 10 shows an example of a data selection circuit from the data save memory 201. It is assumed that N cases of data records 201-1 to 201-N are stored on the data save memory 201. This is data that has been received and saved N times.

  The data selection circuit 202 selects a recording data case designated by the HI screen display processing unit 204. The data display edit processing unit 203 performs editing for displaying the selected data.

  FIG. 7 shows an example of the operation history screen. It is an example of a screen edited by the data display editing processing unit 203. This screen example shows a list of recorded data, and shows an example in which the occurrence date and time 304 and the operation result 305 are displayed in a table format. Here, the times and operation results of the recording cases 306 to 309 are displayed. Here, by selecting the display switches 306 to 309, the data selection circuit 202 of FIG. 10 described above operates in conjunction with the selection of desired data. Reference numerals 306A to 309A denote display units showing the operation contents in the recording shown by 306 to 309.

  The selected data then transitions to the operation content screen shown in FIG. The operation content screen is a screen showing an outline of the result of the apparatus operation.

  FIG. 3 shows the relay operation content display screen 21. On this screen 21, the operation state of each relay element in which data is recorded is displayed. By selecting the switches 29 and 30 on this screen, it is possible to transition to an input electric quantity screen shown in FIG. 4 and FIG. 5 and an operation state screen shown in FIG. Also, by selecting 27, it is possible to return to the operation content screen of FIG.

  The transition between the screens can be performed by selecting 27 to 30, and the switch unit selected together with the screen transition also serves as a display so that it can be recognized that it is being selected by reverse display or the like. The contents described above are not different from the configuration example of the confirmation screen for the data recording of the human interface realized in the existing protection relay.

  As shown in FIG. 3, on the relay operation content display screen 21, the states of the a-phase, b-phase, and c-phase of the relay element 22 are represented by ramps 22a to 22c. The relay state for a certain period is expressed by the relay state or OR logic display processing.

  In this embodiment, a display sample movement switch 23 is provided in order to realize time-series data confirmation in this screen representation. In this example, push button style switches 24 and 25 are provided. However, this may be a style such as a scroll bar or a method of designating display data selection by a numerical value or time by key-in. In this example, the display data is shifted forward in time series by 24 key operations. Conversely, the display data is shifted backward in time series by 25 key operations. The data movement unit may be one sample or a plurality of samples.

  Further, a display 26 for displaying the time series of the data being displayed is provided so that the time series of the display samples can be understood. This display may be a real time or a sampling number or a relative value with respect to the activation time.

  In the present embodiment, the display sample movement switch 23 has a great significance, and the operator switches the display data back and forth in time series, and confirms the display result according to the display data, thereby recording data. It is possible to read the change in the relay operation at.

  According to the present invention, the operation order of the relay elements can be confirmed directly by checking the state of the relay elements while operating the display sample moving switch 23 while paying attention to the desired relay element. As a result, there is no need for the trouble of once reading the recorded data to a personal computer or the like, starting the analysis tool, setting according to the data, or reading the desired data signal, which has been necessary conventionally.

  FIG. 1 shows an example of a display data selection circuit for realizing the present invention. The recording case 4 is data for one case in the data save memory 201. This represents one of the data cases 201-1 to 201-N shown in FIG. The display data selection pointer 1 is a pointer for selecting one sample of data to be displayed on the HI screen 115. One sample of recording data indicated by the display data selection pointer 1 is selected and displayed on the HI screen 115.

  In the HI screen display process 3, the recording data is displayed and a command from the operator is received. The addition / subtraction circuit 2 accepts the selection of the display sample movement switch 23 of FIG. 3 by the HI screen display processing 3, and moves a certain data sample pointed to by the display data selection pointer 1 in time series. This is to switch the data position pointed to by the pointer by the key operation 24 or 25 in FIG.

  For example, it is assumed that the display data selection pointer 1 indicates start point data t0. On the screen, the relay status at t0 is displayed. Here, when 24 key operations are performed, the value of the pointer 1 is subtracted and points to the data from t0 to t-1. Thereby, on the screen, the relay state at t-1 is displayed from the relay state at t0. On the other hand, when 25 key operations are performed, the value of the display data selection pointer 1 is added, and by continuing the key operation from t-1 to t0, the data of t + 1, t + 2 is pointed, and the screen is displayed. The state also changes. As described above, when ON / OFF data is displayed, the same processing can be realized, and can be easily applied to a screen showing ON / OFF as shown in FIGS.

  FIG. 14 shows a data configuration example of samples stored in time series in the recording case 4 shown in FIG. In the recording case 4, a plurality of samples 1 to 120 are stored in time series with reference to a trigger point as an activation point. Each sample has data corresponding to the time of the sample as shown in the sample configuration 5, for example, an input electric quantity 1 sample value (instantaneous value) indicating an input electric quantity to an input electric quantity N sample value (instantaneous value), each RY RY1 state to RYn state indicating the state of NO, DI1 (CB state) state to DIk state indicating the operation state of the circuit breaker, and the like are stored. When a display point is selected by the display data selection pointer 1 shown in FIG. 1, a corresponding sample is read and various information in the sample can be displayed on the HI screen.

  FIG. 2 shows a processing flow of the display sample moving process. By the operation of keys 24 and 25, the value of the display data selection pointer is subtracted or added, the screen is refreshed, and the process of displaying the data of the selected sample is repeated.

  Next, a display method for data that handles analog values, such as input electric quantity, will be described. FIG. 4 shows a screen showing the effective value of the input electric quantity. The input electric quantity screen displays element names of input electric quantities of 32 to 35 indicating a-phase, b-phase, c-phase, and zero phase, and displays effective values and phases corresponding to the elements. In this example, the effective value and the phase are displayed on the right side, and for the element 32, the effective value is displayed at 32RV and the phase is displayed at 32PH. As for the phase display, an expression based on any element is necessary, and 32 to 35 also serve as a selection switch, perform selection as a phase reference, and invert so that the selected element can be understood. Display and so on.

  With the effective value and phase display as shown in the screen 31 showing the effective value and phase of the input electric quantity, it is difficult to recognize the transient display when the protective relay device is operated. Waveform drawing based on value data was performed. In this embodiment, there are an instantaneous value selection switch 39-1 and an effective value selection switch 39-2, and an instantaneous value display and an effective value display can be selected. Further, any data can be read using the display sample movement switch 23.

  FIG. 5 shows a screen 41 showing the instantaneous value of the input electric quantity. The screen 41 is changed by selecting the instantaneous value selection switch 39-1. 42V is an instantaneous value corresponding to the element 32. As with the ON / OFF data display, the display sample moving switch 23 can confirm the contents of the recorded data in time series.

  FIG. 6 shows an operation status display screen 51. On this screen 51, 52 and 53 indicating element names such as a circuit breaker and a limit switch, and lamp images 52L and 53L indicating operation states such as an On / OFF state of each element are displayed. Also on this screen 51, arbitrary data can be read out by the display sample movement switch 23.

  FIG. 8 shows an operation content display screen 310. On this screen 310, an outline of the operation result among the recorded device operation data is displayed. The transition between the screens shown in FIGS. 3 to 8 can be performed by selecting 27 to 30, and the switch unit selected together with the screen transition also serves as a display and is being selected by reverse display or the like. To be able to recognize.

  Examples of the HI screen that always displays data are shown in FIGS. 11 is a display screen for relay operation, FIG. 12 is a display screen for input electric quantity, and FIG. 13 is a display screen for operation status. Thus, in the present embodiment, the time-series data display screens shown in FIGS. 3 to 6 and the constant data display screens shown in FIGS. It is an example. By configuring the screen in this way, the user can easily operate.

  In this way, in this embodiment, even without special software, the standard human interface can check the instantaneous value of the waveform and confirm the relay operation in time series. In addition to being able to respond without increasing, it is possible to provide a function that can immediately confirm the time series of information to be confirmed without performing special settings and data selection as compared with the case of using an analysis tool.

  In addition, from the information recorded on the HI screen, it is possible to grasp the time series relay response and equipment condition changes, or transient changes in system voltage and current information. Etc. become unnecessary. This makes it possible to completely eliminate the trouble of reading out the data record and displaying it with an analysis tool during product testing and local phenomenon analysis, which greatly contributes to labor saving.

  In addition, the analysis tool implemented with dedicated software handles data recording of one event at a time, so after reading a set of data to the analysis tool, the signal to be checked on the analysis tool However, with the method of the present invention, it is only necessary to pay attention to only a desired signal for confirmation, which is excellent in ergonomics and can greatly improve convenience.

1 Display data selection pointer 2 Addition / subtraction circuit 3 HI screen display processing 4 Recording case 5 Sample configuration 21 Relay operation content display screen 22 Relay element name (RY1)
22a Lamp image 22b showing the operating state of the first phase of the relay element RY1 22b Lamp image 22c showing the operating state of the second phase of the relay element RY1 23c Lamp image showing the operating state of the third phase of the relay element RY1 23 Display sample movement switch 24 A switch for instructing to subtract the value of the pointer of the display data 25 A switch for instructing to add the value of the pointer of the display data 26 A display for displaying the time series of the data being displayed 27 A switch for switching to the operation history screen A switch for transitioning to the screen and a display 29 for displaying that the currently displayed screen is a relay operation screen. A switch for transitioning to the input electrical quantity screen and the currently displayed screen are the input electrical quantity screen. Indicator 30 for displaying a switch and switch for transitioning to the operation status screen Indicator 31 for displaying that the screen currently being displayed is in an operating state Screen 32 for displaying the effective value and phase of the input electric quantity In order to display the element name (VA) of the electric quantity and to set it as a phase reference Indicator 32RV indicating the effective value of the electric quantity element VA 32PH Value indicating the phase of the electric quantity element VA 33 Electric quantity element name (VB)
34 Electric quantity element name (VC)
35 Electric quantity element name (VO)
39 Switch for instructing switching of instantaneous value or effective value for display content of electric quantity and display unit 39-1 indicating display currently selected. Switch for selecting instantaneous value and instantaneous value are selected. A display 39-2 indicating that the effective value is selected and a display 41 indicating that the effective value is selected A screen 42 indicating the instantaneous value of the input electric quantity 42V A value indicating the instantaneous value of the electric quantity VA 51 Operation status display screen 52 ON / OFF data element name indicating the operation status (AAA)
52L Lamp image indicating the status of the operational status element AAAA 53 ON / OFF data element name indicating the operational status (BBBB)
53L Lamp image showing the state of the operation state element BBBB 101 Input converter auxiliary transformer 102 Analog filter 103 A / D converter 104 Relay operation unit 105 Input circuit 106 Sequence processing unit 107 Output circuit 108 Data save memory 109 Current transformer CT
110 Transformer PT
111 Ring buffer 112 HI processing unit 113, 203 Data display editing processing unit 114, 204 HI screen display processing unit 115 HI screen 201 Data save memory 201-1 to 201-N Case 1 to case existing in data save memory for recording Recording data for N times N up to N 202 Data selection circuit 301 Screen showing a list of recorded device operation data 302 Label showing an operation history screen 303 List showing operation history from recorded data Occurrence date and time 305 Operation results 306 and 307 To 309 Display for displaying the recording start time of the operation record, and switches 306A and 307A to 309A for selecting as the detailed display. Display indicating the operation content in the recording indicated by 306 310 Operation content display screen t0 Start time of data recording ( (Starting point) Data t + 1 Recording data t + 2 after 1 sample from the starting point Recording data t + 3 after 2 samples from the starting point Recording data t + 4 after 3 samples from the starting point Recording data t + 4 after 4 samples from the starting point Recording after 5 samples from the starting point Data t + 6 Recording data t + n after 6 samples from the starting point Recording data t-1 after n samples from the starting point Recording data t-2 one sample before the starting point Recording data t-2 two samples before the starting point Starting point Recorded data 3 samples before the sample tm Recorded data m samples before the starting point

Claims (10)

A / D conversion means for A / D converting analog electric quantity input from the power system into digital electric quantity;
Relay calculation means for performing a relay calculation using the digital quantity of electricity output from the A / D conversion means to determine abnormality of the power system;
Sequence processing means for outputting an operation command to a circuit breaker connected to the power system based on a relay calculation result output from the relay calculation means;
The relay operation result determined to be abnormal or the operation command to the circuit breaker is detected as a trigger, and the digital electric quantity from the detection time of the trigger to the elapse of a predetermined time includes a plurality of times for each conversion time of the A / D conversion. Memory means divided into samples and stored in time series;
Display editing processing means for selecting a sample corresponding to a specified time from the plurality of samples and performing display processing on a display device;
Protection relay device having. In claim 1,
The sample stored in the memory means stores the relay calculation result and the operating state of the circuit breaker together with the digital electric quantity,
The display editing processing means selects the sample corresponding to a designated time and performs display processing on the display device. In claim 1 or claim 2,
The display editing processing means includes a display data selection unit that selects the sample corresponding to a specified time, and an addition / subtraction that moves the sample selected by the display data selection unit in response to a movement instruction to move the display time forward or backward A protective relay device comprising: a circuit unit; The protection relay device according to claim 3, wherein a display point movement switch that receives the movement instruction is displayed on each screen on which the digital electric quantity, the relay calculation result, and an operating state of the circuit breaker are displayed. . In claim 1,
The sample stored in the memory means is divided into a plurality of cases for each trigger serving as a reference,
The protective relay device characterized in that the display editing processing means selects the case from the memory means and numerically displays a digital electricity quantity at a designated time in the case on the display device. In claim 5,
The display editing processing means displays a numerical value by selecting a digital electric quantity to be displayed on the display device from an effective value or an instantaneous value, and displaying the numerical value. In claim 1,
The display editing processing means selects a digital electricity quantity output from the A / D conversion means or a digital electricity quantity stored in the memory means, and performs a display process on a display device. apparatus. Further in claim 1,
A ring buffer means is provided in which the digital electricity is sequentially written so as to cycle through a certain memory area,
The protection relay device according to claim 1, wherein the digital electricity quantity within a preset time range before and after the trigger detection time is stored from the ring buffer means to the memory means. A / D conversion of analog electricity input from the power system into digital electricity,
Performing the power system protection calculation using the digital quantity of electricity,
A trip command for operating a circuit breaker provided in the power system based on the protection calculation result is output,
The digital electricity quantity from the output time of the trip command to the lapse of a predetermined time is stored in a memory in time series,
Specify a temporary point from the digital electricity stored in time series in the memory,
The digital electric quantity at the designated temporary point is displayed numerically on the display device,
A data display method for a protection relay device that accepts an instruction to change the temporary point to be displayed and numerically displays a digital electric quantity at one point after sequential change. In claim 9,
The protection calculation result from the output time of the trip command to the predetermined time elapse and the operation state of the circuit breaker are stored in the memory together with the digital electric quantity in time series,
A display change switch for changing the display from the numerical display screen of the digital electricity quantity at the temporary point to the protection calculation result display screen at the temporary point or the operation state display screen of the circuit breaker at the temporary point. A data display method for a protection relay device, wherein the data is displayed on a numerical display screen.

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