JPH10201075A - Setting selector for protective relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a setting selector for a protective relay which can easily select and manage the setting regardless of the form of the relay constituting a protective relay. SOLUTION: For the fault within the protection block of a protective relay device and outside the adjacent protection block, this setting selector computes the quantity of electricity at fault viewed from a protective relay device with a quantity-of-electricity-at-fault computing means 15, and based on the quantity of electricity at fault computed with the quantity-of-electricity-at-fault computing means 15, this decides the setting target values of a plurality of relays constituting the protective relay with a set value deciding means 16. Then, an optimum tap abstracting means 17 analyses the conditions of restricting the setting range of a single column stored in a relay form vs. setting range data base 7 and expressed by the text based on the grammatical construction rules, and abstracts the setting tap value which satisfies the duty of each relay so that it may fulfill the setting target value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a setting value selection device for a protection relay device for selecting an optimum setting value of a protection relay device installed in a power system.

[0002]

2. Description of the Related Art In order for a protection relay device of a power system to achieve a required function, it is necessary to satisfy an operation duty and a non-operation duty assigned to each relay constituting the protection relay device. . In other words, an operation duty to accurately detect an accident occurring in the protection zone is imposed, while a non-operation duty to never operate in a normal condition or an accident outside the protection zone is imposed. ing. For this reason, when setting the operating conditions of the protection relay device, a detailed study on the load current and the fault current is performed on the assumption of various system conditions.

[0003] In order to make such work accurate and efficient,
A set value selecting device for calculating a set value of a protection relay device has been developed. The setting value selection device is configured by applying an electronic computer, and a computer system and a program thereof have been developed. For example, when setting a distance relay (impedance relay) using such a setting value selection device, the setting is performed as follows.

Here, the set distance relay is installed in the transmission line, and determines whether or not the accident is within the protection section based on the magnitude of the impedance value up to the failure point. A description will be given of an example of a distance relay having an operation duty and a next bus failure as a non-operation duty. The distance relay in this example is a relay called the second stage of distance by many electric utilities. (1) First, the settling program searches for the next bus and the next bus starting from the relay installation point. Usually, a plurality of next-generation buses exist as shown in FIG. (2) Next, the next bus and the next bus searched above are designated as fault points one by one, and a fault calculation is executed, and in each case, the impedance observed by the relay to be settled is obtained. The failure calculation is usually performed using the symmetric coordinate method. (3) The maximum value of the impedance observed by the relay in the case of the next bus failure is obtained, and a value obtained by multiplying the maximum value by the safety factor is set as the target value of the operation duty. The safety factor is set to one or more values, for example, 1.2 in consideration of calculation errors and relay errors. (4) Next, the minimum value of the impedance observed by the relay in the case of the secondary bus failure is obtained, and the value obtained by multiplying the obtained value by the safety factor is set as the non-operation duty settling target value. In this case, since it is a safety factor for thorough non-operation duty, it is set to a value less than 1 such as 0.8, for example. (5) Calculate a set value that satisfies “set target value of operation duty <set value <set target value of non-operation duty” under the settling range constraint condition of the relay. Normally, there are a plurality of set values that satisfy the above inequality. Therefore, a set value close to the inoperative duty is selected so that the sensitivity is set as high as possible. If there is no set value that satisfies the above inequality, a set value that prioritizes the set target value of the operation duty is selected, and a message to that effect is output to the operator.

Here, the settling range constraint condition of a relay is a series of settling taps of the relay, and its expression varies depending on the relay type and the manufacturer, but is roughly classified into the following two types. (1) An upper limit tap value, a lower limit tap value, and a step size (step value) are given. (Example 1) 1.00-100.00, 0.1 steps (2) Discrete values (tap value 1 to tap value n) (Example 2) 1.00, 2.00, 5.00, 10.00 The above description is for a distance relay, but an actual protection relay device is a combination of relays of various principles. Because of the configuration, a setting guide according to each operation principle is defined, and correspondingly, a setting program of various contents is prepared. The concept of calculating the settling target value of the operating duty and the settling target value of the non-operating duty based on the failure calculation and selecting a settling value that satisfies the above inequality and the settling range constraint of the relay is the same in any case. is there.

In the setting value selection device for setting the protection relay, the setting range constraint condition is stored in the database together with the relay format. However, as described above, the expression of the setting range constraint condition differs depending on the relay format. When designing the database, either change the data structure according to the relay type, or use any of the following: "format, upper limit tap value, lower limit tap value, step size, tap value 1, tap value 2, ... tap value n". It has a data structure that can handle the case of the relay format. In this case, a method of putting NULL (empty) in unnecessary columns is used.

Further, since a protection relay device composed of various types of relays is managed in units of the protection relay device, a database of the protection relay device and each relay type constituting the protection relay device is stored in a database. The association is defined. As a man-machine interface of this database, the format, the setting range, and the setting value of each relay (device) constituting the protection relay device are edited and output on one screen or form. this is,
This is because the forms edited in this way have been customarily used by most electric utilities under the name of “settling slip” or “settling notice”.

[0008] In this case, as described above, it is necessary to change the format of the screen or form according to the difference in the settling range constraint condition, or to make the format compatible with any of them, but from the viewpoint of visibility. There is a need for a way to change the format.

As described above, as a data structure for expressing the settling range constraint condition of the relay constituting the protection relay device, a method of changing the data structure according to the type of the relay, and a method of substituting NULL into unnecessary columns. There is a method of using a data structure that can cope with any case, and one of them has been adopted.

[0010]

However, in any of these cases, a program for referring to this data requires a process for selectively using the data to be used according to the format, and a new relay will be introduced in the future. In some cases, the data structure may need to be changed,
It is a hindrance to improving maintainability and expandability.

[0011] When editing the "settling slip",
Since there are a plurality of expressions of the settling range constraint condition, it is necessary to prepare, for example, more than 40 types of “setting slip” screen formats. FIG. 21 shows a conventional setting slip screen. As can be seen from FIG. 21, the format of the set range constraint condition varies depending on the device, but the device used varies depending on the type and manufacturer of the protection relay device. That is why the huge format is required, which is deteriorating economics, maintainability and scalability.

An object of the present invention is to provide a setting value selection device for a protection relay device which can easily select and manage a set value regardless of the type of a relay constituting the protection relay.

[0013]

According to a first aspect of the present invention, there is provided a failure-time electricity calculating device for calculating a failure-time electricity quantity as viewed from a protection relay device with respect to a failure inside a protection section of a protection relay device and outside a protection section adjacent thereto. An amount calculating means, a settling value determining means for determining a settling target value of a plurality of relays constituting the protection relay device based on the electrical quantity at fault calculated by the electrical quantity at fault calculating means, and a protection relay device. A relay format versus settling range database that expresses the settling range constraints of multiple relays as text based on syntax rules and stores it as a single column, and a single column settling range constraint stored in the relay format versus settling range database An optimum tap extracting means for analyzing conditions and extracting set tap values satisfying the duty of each relay so as to satisfy the set target value.

According to the first aspect of the present invention, the faulty electricity quantity as seen from the protection relay apparatus is calculated by the faulty electricity quantity calculation means with respect to the faults inside the protection section of the protection relay apparatus and outside the adjacent protection section. The setting target value of the plurality of relays constituting the protection relay device is determined by the setting value determining means based on the electrical quantity at failure calculated by the electrical quantity at time calculating means, and the optimum tap extracting means is a relay type vs. setting range database. And analyzes the single column settling range constraints expressed in text based on the syntax rules, and extracts settling tap values that satisfy the responsibilities of each relay so as to satisfy the settling target value.

According to a second aspect of the present invention, in the first aspect of the present invention, the contents of the settling range constraint expressed in text based on the syntax rules and stored as a single column in the relay format settling range database are displayed on a screen. Input and output checking means for inputting a setting range constraint condition from a screen displayed on the input / output device to update the relay format vs. setting range database and to detect a syntax error. .

According to the second aspect of the present invention, in addition to the operation of the first aspect, the contents of the set range constraint condition of a single column expressed in text based on the syntax rules are displayed on a screen of the input / output device and input. The checking means inputs the settling range constraint condition via the screen displayed on the input / output device, updates the relay type versus settling range database, and detects a syntax error.

The third aspect of the present invention is the first or second aspect.
In the invention of the above, for each of a plurality of relays constituting the protection relay device, a settling slip for editing a format, a settling value, a settling range constraint condition and an introduced electric quantity unit to create a settling slip screen and displaying the same on an input / output device It is provided with display means.

According to the third aspect of the present invention, in addition to the operation of the first or second aspect, the settling slip display means includes a format, a set value, and a set range constraint for each of a plurality of relays constituting the protection relay device. Edit the conditions and the amount of introduced electricity to create a settling slip screen and display it on the input / output device.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a set range threshold screen for setting a set range threshold condition is displayed on the input / output device, and the set range threshold screen is displayed. It is provided with a text generating means for generating a text that inputs a threshold value and describes the settling range constraint condition based on a syntax rule.

According to a fourth aspect of the present invention, in addition to the operation of the first aspect, the text generation means displays a set range threshold screen for setting a set range threshold value on the input / output device. Then, a threshold value is input from the setting range threshold screen to generate a text describing the setting range constraint condition based on the syntax rules.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the basic concept of the present invention will be described. In the present invention, a database is used in which the settling range constraint is stored in a single column regardless of the type of the relay. In this case, from the standpoint of database theory, storing the settling range constraints of the relay in a single force ram means to combine them into a single domain (domain). The settling range constraint of a real relay spans multiple domains. That is, some are defined as “upper tap value, lower tap value, step size”, and some are “tap value 1, tap value 2,...
Tap value n ". In order to combine such a plurality of domains into one domain, some rules are required.

Therefore, such a rule is expressed as text data having a syntax rule. As a result, not only does it become a single domain of a set of symbols, but it also makes it possible to understand the physical meaning at a glance, and the inkstone recognition when viewed from a human standpoint is improved.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a block diagram of the first embodiment of the present invention. The setting value selection device according to the first embodiment is configured by an electronic computer 14. The failure-time electricity quantity calculation 15 calculates various electricity quantities in the event of a bus failure based on the data stored in the facility database 1, the power flow condition file 2, and the settling terminal file 3, and calculates the various electricity quantities. The quantity is stored in the failure electric quantity file 4. The settling value determining means 16 determines a settling target value of the relay based on the various electrical quantities stored in the electrical quantity at failure file 4 and the data stored in the relay-to-relay type database 6 and optimizes it as the extraction request data 8. Output to tap extracting means 17. The optimum tap extracting means 17 extracts the relay settling tap value based on the output request data 8 and the data of the relay format versus settling range database 7 and extracts the extracted result data 9
Is output to the set value determination means 16. The set value determination means 16 stores the extraction result in the set value result file 5. The failure-time electricity quantity calculating means 15, the settling value determining means 16, and the optimum tap extracting means 17 are all realized as a computer program.

Next, the equipment database 1 stores the connection state of the power system and equipment constants, and stores a power flow condition file 2
Stores the generator output, the load power, the amount of phase adjustment equipment, and the like. As shown in FIG. 2, the settling terminal file 3 stores equipment information designated as an object to be settled, and its expression content follows the system of the equipment database 1.

As shown in FIG. 3, the electric quantity at failure file 4 includes three sections ahead of the settling terminal, that is, the next bus, the next bus, and the next bus. It stores various quantities of electricity to be observed. That is, the relay introduction current I, the relay introduction voltage V, and the relay distance impedance Z in the case of a three-phase short-circuit fault or a one-line ground fault at the next bus, the next bus, and the next next bus are stored. The suffix S of these quantities indicates the case of a three-phase short-circuit fault, and the suffix G indicates the case of a one-line ground fault. Further, the settling result file 5 stores the settling tap value calculated as the calculation result.

The relay device-to-relay format database 6 stores data defining the types of relays constituting the protection relay device as shown in FIG. As shown in FIG. 5, the relay type versus settling range database 7 stores data defining a settling range corresponding to the relay type. Stores unit of quantity. To create these data, a text editor provided in a computer is used.

As described above, a feature of the present invention is that the settling range constraint of the relay format pair settling range database 7 is configured as text data based on syntax rules. In the first embodiment, the syntax rules are determined as follows.

Settling range constraint condition: lower limit tap-upper limit tap (step value) B or: tap value 1, tap value 2,... Tap value nB where lower limit tap, upper limit tap, step value, tap value 1, tap value The value 2,..., The tap value n are all integers or decimal numbers. B is a blank code.

Although the syntax rules defined here can be understood by an operator by reading this text as it is, if necessary, a more explicit syntax, for example, “lower limit = 1.0
The rule may be described as "0".

The extraction request data 8 is, as shown in FIG.
It is data that stores the device (equipment number) and format of the relay to be set, the set target value, and the duty. Here, the duty is not expressed as the operation duty / non-operation duty, but is designated to cut off or round up the tap. The reason for this is that in the relay that operates when the amount of electricity becomes excessive and the relay that operates when the amount of electricity becomes insufficient, the criterion for adopting taps (rounding up / down) is reversed for responsibilities. Set reference to set value determination means 16
This is to make it possible to recognize The extraction result data 9 stores a settling tap value and a status as shown in FIG. The status is data for notifying that the setting target value has deviated from the setting range constraint condition (lower limit deviation / upper limit deviation).

Next, the operation of the set value selection device according to the first embodiment will be described. FIG. 8 is a diagram showing the failure-time electricity quantity calculating means 15.
6 is a flowchart showing the content of the calculation of FIG. Step S1
Then, data from the equipment database 1 and the tide condition file 2 are read, and a so-called node branch model is created. Next, in step S2, a Newton-Raphson method flow calculation is executed to obtain a solution. The result of the power flow calculation is used as a pre-fault voltage of each bus in the fault calculation performed in steps S4 and S5. If the pre-failure voltage can be used as the reference voltage, step S2 can be omitted.

Next, in step S3, the system is searched, and all the next buses, the next next buses, and the next next buses are obtained starting from the settling terminal. The fault calculation is executed in steps S4 and S5 with each bus determined in step S3 as a fault point. In the first embodiment, a failure calculation is performed for a three-phase short circuit (3LS) in step S4 and a one-line ground fault (1LG) failure in step S5. The failure calculation method uses a symmetric coordinate method. That is,
Positive-phase and zero-phase drive point impedances Z1 and Z0 at the fault point
And consider that the negative-sequence impedance is equal to the positive-sequence impedance to obtain a three-phase short (3LS) and 1
The fault point current at the time of the line ground fault (1LG) is expressed by equation (1),
It can be obtained by equation (2).

IF1 = E / Z1, IF2 = IF0 = 0 (1) IFI = IF2 = IF0 = E / (2Z1 + Z0) (2) where IF1 is the positive-phase current at the fault point, and IF2 is the positive-phase current at the fault point. The negative-phase current, IF0 is the zero-phase current at the fault point, and E is the voltage before the fault point.

In the event of a fault, the voltage at each node in the symmetrical equivalent circuit can be obtained by solving the equation (3) since the voltage at each node is reduced by the current at the fault point being diverted to each branch.

[ΔV] = [Z] [IF] (3) where [ΔV] is a column vector of the voltage drop amount of each node, [Z] is a node impedance matrix, and [IF] is a value of each node current. This is a column vector (a fault point current enters a fault point node element, and all other elements are 0).

Steps S4 and S5 are repeatedly executed until the fault calculation is executed for all the buses obtained in step S3. The end determination of the repetition is step S6. When the repetition is completed, step S7 is executed. In step S7, the failure calculation results obtained so far are sorted by using the magnitudes of current, voltage, and impedance for the next bus, the next bus, and the next bus, respectively, as keys.
The failure electricity file 4 shown in FIG. 3 is created.

The set value determining means 16 refers to the relay device-to-relay format database 6 to extract a relay to be set and to select a set value for the relay. For example,
In the first-stage short-circuit detection relay, a value obtained by multiplying a non-operation duty at the time of a next bus failure by a safety factor is a settling target value. Therefore, in this case, a value obtained by multiplying the minimum impedance ZS at the time of the next bus failure by a safety factor (0.8 in the first embodiment) from the electric quantity at failure file 4 is settled. Set the target value.

In the first embodiment, it is assumed that all the rules for selecting the settling target value described above are incorporated into the program. The set value determining means 16 sets the device number, format, set target value, and responsibilities (cut off in the short-circuit detection first-stage relay described above) in the extraction request data 8 and starts the optimum tap extracting means 17.

FIG. 9 is a flow chart showing the contents of calculation by the optimum tap extracting means 17. In step S1, the relay setting vs. setting range database 7 is referred to using the device number and the format of the extraction request data 8 as keys, and the corresponding setting range constraint condition is extracted. Next, in step S2,
Perform lexical analysis on the text data of the set range constraint. Here, the lexical analysis corresponding to the syntax rule performed in step S2 will be described with reference to FIG.

First, the text described in the settling range constraint is fetched one character at a time from the left, and depending on the value of the one character, from state 1 to state 10 or state 14 in FIG.
State transition toward. In FIG. 10, states 1, 2, 3, 5, 6, 8, 9, 12, and 13 indicated by single circles
In, the extracted one character is additionally stored in the buffer one character at a time. In FIG. 10, in states 4, 7, 10, 11, and 14 indicated by double circles, the buffer contents are stacked on the stack at the timing of transition to these states, and the buffer is cleared.

For example, if the setting range constraint condition is "1.22-
In the case of “100.0 (0.1)”, “1” is first extracted in state 1. Then, in state 2, "." Is taken out, so that the process proceeds to state 3. In state 3, "22" is taken out, and "-" is taken out. Since state 4 is a double circle, the contents of the buffer are stacked on the stack and the buffer is cleared. Then, in state 4, "1" is newly taken out and proceeds to state 5, "00" is taken out in state 5, and when "." Is taken out, the state proceeds to state 6. In state 6, "0" is extracted, and when "(" is extracted, the process proceeds to state 7. Since state 7 is a double circle, the contents of the buffer are stacked on the stack and the buffer is cleared. When “0” is extracted and “.” Is extracted in state 8, the process proceeds to state 9.
In state 9, "1" is taken out and ")" is taken out.
Then, the process proceeds to state 10 where the contents of the buffer are stacked on the stack, the buffer is cleared, and the process is terminated.

When such a process is repeated and the state 10 is reached, the lower limit value of the settling range, the upper limit value of the settling range, and the step value are stored in the stack in chronological order. On the other hand, state 14
, The tap values 1 to n are stored in the stack in chronological order. If a character that does not have a state to be transitioned is input, the process is stopped as an error.

Next, in step S3, the extraction request data 8
The process is branched with reference to the duty set in step S4, and a set tap value is extracted in steps S4 and S5 according to the duty. In step S4, the largest tap value below the settling target value is selected, and in step S5, the smallest tap value exceeding the settling target value is selected. If the settling target value is less than the minimum tap value in step S4, the minimum tap value is selected, and the lower limit deviation is set in the status of the extraction result data 9. Similarly, if the settling target value exceeds the maximum tap value in step S5, the maximum tap value is selected and the upper limit deviation is set in the status of the extraction result data 9.

After receiving the extraction result data 9, the settling value determining means 9 executes the same process for all the devices defined in the relay device-to-relay format database 6, and then writes the result in the settling result file 5. finish. Although not shown, the contents of the settling result file 5 are displayed on the input / output device.

As described above, according to the first embodiment, the settling range constraint of the relay is expressed as text based on the syntax rules, and is written in a unified manner regardless of the relay format. Thus, it is possible to unify the data structure of the settling range constraint without impairing the main purpose of executing the settling calculation of the protection relay device. Thus, it is possible to provide a setting value selection device for a protection relay device that is excellent in economy, maintainability, and expandability.

Next, a second embodiment of the present invention will be described. FIG. 11 is a block diagram showing a second embodiment of the present invention. The second embodiment is different from the first embodiment shown in FIG. 1 in that the contents of the settling range constraint conditions stored in the relay type settling range database 7 are displayed as a relay type settling range screen 10. An input / output device 18 to be displayed and a setting range constraint condition are input via a relay type vs. setting range screen 10 displayed on the input / output device 18 to update the relay type vs. setting range database 7 and to correct a syntax error. And an input checking means 19 for detecting. Other configurations are the same as those of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference symbols and description thereof will be omitted.

The relay type versus set range screen 10 is shown in FIG.
As shown in FIG. 7, the screen is configured in accordance with the relay type pair settling range database 7, and is configured so that the operator can make a key input to the displayed contents. The input / output device 18 is a CRT display device connected by a protocol that can communicate with the computer 14.

Next, the operation contents of the input check means 19 are shown in FIG. First, in step S1, the relay format versus set range database 7 is read, and the contents are displayed on the relay format versus set range screen 10 via the input / output device 18. Thereafter, in step 2, the operator waits for an operation of inputting data to the relay type versus settling range screen 10. When the operator executes data input, the input data is transmitted to the input check means 19 via the input / output device 18 and at the same time, an interrupt is generated in the input check means 19 to release the waiting. Here, the data transmission via the input / output device 18 uses a function provided in the basic software of the computer.

In step S3, data is obtained from the input / output device 18, and in step S4, lexical analysis is performed on the settling range constraint condition input by the operator. This lexical analysis method is performed in the same manner as the method already described with reference to FIG. In the course of the lexical analysis, if a character whose state cannot be changed is found in FIG. 10, the lexical analysis is interrupted and an error is determined in step S5. If there is an error, an error message is issued in step S6, and the process waits again for an input in step S2. If there is no error in the lexical analysis and the state reaches the state 10 or the state 14, it is determined that there is no error, and the relay format versus settling range database 7 is updated in step S7, and the process proceeds to step S2.

As described above, according to the second embodiment, the setting range constraint condition of a single column expressed by text based on the syntax rule is displayed on the input / output device.
Since the input checking means can detect a syntax error in the settling range constraint condition at the time of data input, it is possible to improve data reliability.

Next, a third embodiment of the present invention will be described. FIG. 14 is a block diagram showing a third embodiment of the present invention. The third embodiment is different from the first embodiment shown in FIG. 1 in that a set value file 11 for storing set values of each relay constituting all the protection relay devices to be calculated is provided. A setting slip display means 20 for creating a setting slip screen 12 based on the data in the set value file 11 and the relay pair setting range database 7 and displaying the setting slip screen 12 on the input / output device 18 is provided. In this case, the settling slip display means 20 creates the settling slip screen 12 by editing the format, the settling value, the settling range restricting condition, and the unit of introduced electricity for each of the plurality of relays constituting the protection relay device. Other configurations are the same as those of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference symbols and description thereof will be omitted.

The set value file 11 is a file for storing the set values of the respective relays constituting all the protection relay devices to be calculated. As shown in FIG. I have. The setting slip screen 12 displayed on the input / output device 18 is a screen as shown in FIG. The input / output device 18 is a computer.
4 is a CRT display device connected by a protocol capable of communicating with the CRT 4.

The settling slip display means 20 reads a certain equipment name from the equipment database 1 and then reads from the relay apparatus / relay type database 6 the device and type of each relay constituting the protection relay apparatus installed in the equipment. Further, the corresponding set values are read from the set value file 11, and finally, the set range constraint conditions and the amount of introduced electricity of each format are set in the relay format versus set range database 7.
Read from. These are edited on the settling slip screen 12 as shown in FIG. 16 and transmitted to the input / output device 18, whereby the settling slip screen 12 is displayed.

As described above, according to the third embodiment, it is possible to unify the format of the setting slip screen 12 without impairing the visibility of the operator.

Next, a fourth embodiment of the present invention will be described. FIG. 17 is a block diagram showing a fourth embodiment of the present invention. This fourth embodiment is different from the third embodiment shown in FIG. 14 in that the contents of the settling range constraint stored in the relay type settling range database 7 are displayed as a relay type settling range screen 10. An input / output device 18 to be displayed and a setting range constraint condition are input via a relay type vs. setting range screen 10 displayed on the input / output device 18 to update the relay type vs. setting range database 7 and to correct a syntax error. And an input checking means 19 for detecting. The other configuration is the same as that of the third embodiment shown in FIG. 14, and therefore, the same components are denoted by the same reference characters and description thereof will be omitted.

According to the fourth embodiment, the reliability of data is improved by detecting a syntax error in the set range constraint, and the format of the set slip screen is unified without impairing the visibility of the operator. It is possible to do.

Next, a fifth embodiment of the present invention will be described. FIG. 18 is a block diagram showing a fifth embodiment of the present invention. In the fifth embodiment, a set range threshold screen 13 for setting a threshold of a set range constraint condition is displayed on the input / output device 18 with respect to the first embodiment shown in FIG. Then, a text generating means 21 for inputting a threshold value from the settling range threshold value screen 13 and generating text describing the settling range constraint condition based on the syntax rules.
Is additionally provided. Other configurations are the same as those of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference symbols and description thereof will be omitted.

The text generating means 21 is achieved by a program of the computer 14. The input / output device 18 is a CRT connected by a protocol capable of communicating with the computer 14.
A display device. The setting range threshold screen 13 is shown in FIG.
Is a screen which is configured to display and input each threshold value of the settling range constraint condition as shown in FIG. The threshold values of the settling range constraint condition are an upper tap value, a lower tap value, and a step value. The text generation means 21 reads the settling range constraint condition of a certain relay from the relay format vs. settling range database 7, performs lexical analysis on the read setting range constraints, and extracts the settling range threshold value. The method is the same as the method described with reference to FIG. These are edited on the set range threshold screen 13 shown in FIG. 19 and transmitted to the input / output device 18 to display the set range threshold screen 13.

Thereafter, the text generating means 21 enters a waiting state and is restarted when the operator inputs data to the set range threshold screen 13. The text generator 21 edits the input threshold into text data conforming to the syntax rules, and updates the relay format versus settling range database 7. When editing text data,
When the operator inputs data to the tap upper limit, the operator edits the data as “tap upper limit−tap lower limit (step value)”, and when the operator inputs data to the tap value n, “tap value 1, tap value 2,. Edit as "tap value 12".

As described above, according to the fifth embodiment, the operator can directly enter the text into the single column without deteriorating the original purpose of storing the settling range constraint as text based on the syntax rules in a single column. Can be avoided.

[0061]

As described above, according to the present invention,
Since the settling range constraint of the protection relay is expressed as text conforming to the syntax rules and expressed in a unified manner regardless of the relay format, software related to this is standardized, and it is economical, maintainable, and extensible. And a setting value selection device for the protection relay device.

Further, by preventing a syntax error of the set range constraint condition and automatically generating a text conforming to the syntax rule based on the set range constraint condition input by the operator, a highly reliable protection relay device is provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a settling terminal file according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a failure-time electric quantity file according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of a relay device-to-relay format database according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of a relay type versus settling range database according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram of extraction request data according to the first embodiment of the present invention.

FIG. 7 is an explanatory diagram of extraction result data according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing calculation contents of a failure-time electricity quantity calculating means 15 according to the first embodiment of the present invention.

FIG. 9 is a flowchart showing calculation contents of the optimal tap extracting means 17 in Karutani according to the first embodiment of the present invention.

FIG. 10 is a conceptual diagram of lexical analysis of a set range constraint condition by the optimum tap extracting unit according to the first embodiment of the present invention.

FIG. 11 is a block diagram showing a second embodiment of the present invention.

FIG. 12 is an explanatory diagram of a relay type versus set range screen according to the second embodiment of the present invention.

FIG. 13 is a flowchart showing the contents of calculation by input check means according to the second embodiment of the present invention.

FIG. 14 is a block diagram showing a third embodiment of the present invention.

FIG. 15 is an explanatory diagram of a set value file according to the third embodiment of the present invention.

FIG. 16 is an explanatory diagram of a setting slip screen according to the third embodiment of the present invention.

FIG. 17 is a block diagram showing a fourth embodiment of the present invention.

FIG. 18 is a block diagram showing a fifth embodiment of the present invention.

FIG. 19 is an explanatory diagram of a set range threshold screen according to the fifth embodiment of the present invention.

FIG. 20 is an explanatory diagram of a protection section of the protection relay device in the power system.

FIG. 21 is an explanatory diagram of a conventional setting slip screen.

[Explanation of symbols]

 1 Equipment database 2 Power flow condition file 3 Setting terminal file 4 Electric quantity file at the time of failure 5 Settling result file 6 Relay device vs. relay type database 7 Relay type vs. setting range database 8 Extraction request data 9 Extraction result data 10 Relay type vs. setting range screen DESCRIPTION OF SYMBOLS 11 Setting value file 12 Setting slip screen 13 Setting range threshold value screen 14 Computer 15 Electricity failure calculation means 16 Setting value determining means 17 Optimal tap extracting means 18 Input / output device 19 Input check means 20 Setting slip displaying means 21 Text Generation means

Claims (4)

[Claims] An apparatus for selecting an optimum set value of a protection relay device installed in an electric power system, comprising: Means for calculating the quantity of electricity at the time of failure as viewed from the protection relay device, and a plurality of relays constituting the protection relay device based on the quantity of electricity at the time of failure calculated by the quantity of electricity at failure calculation means A set value determining means for determining a set target value of the relay type, and a relay format versus set range in which the set range constraints of the plurality of relays constituting the protection relay device are expressed as text based on syntax rules and stored as a single column. A database and the settling range constraint of a single column stored in the relay type versus settling range database are analyzed and each of the relays is set so as to satisfy the settling target value. A set value selecting device for a protection relay device, comprising: an optimum tap extracting means for extracting a set tap value that satisfies Ray's duty. 2. An input / output device for displaying on a screen the contents of the settling range constraints stored in the relay format vs. settling range database as a single column, expressed in text based on syntax rules, and the input / output device. 2. The apparatus according to claim 1, further comprising input checking means for inputting said settling range constraint condition from a screen displayed on an output device, updating said relay format versus settling range database, and detecting a syntax error. Set value selection device for protection relay device. 3. For each of a plurality of relays constituting the protection relay device, a format, a set value, a set range constraint condition, and a unit of electric quantity to be introduced are edited to create a set slip screen and display it on an input / output device. The set value selecting device for a protection relay device according to claim 1 or 2, further comprising a set slip display means. 4. A setting range threshold value screen for setting a threshold value of the settling range constraint condition is displayed on an input / output device, and a threshold value is input from the setting range threshold value screen to set the setting range. 2. The setting value selection device for a protection relay device according to claim 1, further comprising a text generation unit configured to generate a text that expresses the constraint condition based on a syntax rule.