JPS6152608B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention executes protection arithmetic processing on data taken in from a power system by referring to a set value,
This invention relates to a method for setting and displaying a set value, which requires high reliability and ease of maintenance, in a digital protective relay device that protects a power system with its output.

As shown in FIG. 1 as a configuration example of the main parts, the digital protective relay device includes an arithmetic processing section 11, a memory section 12, an analog input card 13, a digital input/output card 14, and a setting value setting display section 15. and an internal bus 16. The analog data signals of voltage and current values taken in from the power system are first converted into digital data signals by the analog input card 13. This digital data signal is supplied to the arithmetic processing section 11 via the bus 16. The arithmetic processing section 11 performs protection arithmetic processing on the input data signal according to the protection arithmetic program in the memory section 12, referring to the set value also stored in the memory section 12, and performs the protection relay function. do. Here, the reference setting value refers to the operation setting value of the protection relay, which is used as an essential determination constant in the protection calculation processing process. This operation setting value is a constant determined by the state of the power system in which the protective relay device is placed and the protection range, and is not uniquely determined. Furthermore, when the state of the power system changes, the set value needs to be changed accordingly.
Therefore, the requirements that this type of digital protection relay device must meet regarding the setting value are that the required setting value can be set, the setting operation is easy, the set setting value can be confirmed, and the protection For example, it is possible to confirm that the set value is correct during calculation processing. Therefore, in the conventional digital protective relay device, the set value setting display section 15 consists of a set value setting display switch, a setting device and a relay selector operated by the operator, and a display for checking the set value. The value setting display section 15 and the digital input/output card 14 are connected by a setting/display request signal line 18 and a set value input/output line 17. Then, the setting value setting display section 15
The setting device and display are configured so that the setting value can be set and displayed in decimal numbers. Furthermore, the memory unit 12 has a set value constant area, in which a set value in binary coded decimal notation inputted from the set value setting display unit 15 is stored as a predetermined value for protection calculation processing by the arithmetic processing unit 11. Only the binary set values that have been converted are stored. When a request to confirm (display) the set value is issued from the set value setting display section 15, the arithmetic processing section 11 reads out the set value from the memory section 12, converts it back into a binary coded decimal number, and displays the set value on the set value setting display section 15. By supplying it, the set value can be displayed on the display.

However, in conventional devices with such a configuration, the setting value for protection calculation processing must be inversely converted for display, and the inverse conversion includes a truncation error, resulting in a difference between the setting value and the display setting. The disadvantage is that there is a difference in value that is difficult to obtain.

An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a digital protective relay device having a memory section for duplicating and storing a set setting value and a value converted from the set value for protection calculation processing. There is a particular thing.

The present invention stores a primary setting value inputted from a setting unit in a primary setting value storage area of a memory, and converts the primary setting value into a secondary setting value that can be referenced in the process of protection calculation processing in an arithmetic processing unit. After conversion, the secondary setting value is stored in the secondary setting value storage area of the memory, and during display processing, the arithmetic processing section converts the required primary setting value stored in the primary setting value storage area. converting it into a corresponding secondary setting value, and comparing the secondary setting value with the desired secondary setting value stored in the secondary setting value storage area,
After confirming that both of the secondary setting values are acceptable values, the required primary setting value stored in the primary setting value storage area is output to the display section. .

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 shows an embodiment of the main part of the digital protection relay device according to the present invention. The system configuration of this digital protective relay device is almost the same as that of the conventional device shown in FIG. 1, and a description of the similar parts will be omitted. As shown in FIG. 2, the setting value setting display section 20 includes a display 21, a setting device 22,
It consists of a setting/display request switch 23 and a relay selection switch 24. Further, the memory section 25 has a primary setting value storage area 26 and a secondary setting value storage area 27.

Now, the operator selects the desired relay with the relay selection switch 24 and enters a new setting value with the setting device 2.
2, then press the setting/display request switch 2.
When 3 is pressed, a setting request signal is sent to the arithmetic processing unit 11 via the signal line 28 and the digital input/output card 14.
supplied to In response to this, the arithmetic processing unit 11
However, by using the free time of the protection calculation process, the setting value constant for which the setting is requested is determined based on the output signal of the relay selection switch 24, and the setting device 2
The primary setting value of the binary coded decimal number sent from 2 is
While storing it in the corresponding address of the primary setting value storage area 26 of the memory section 25 as it is,
The primary setting value is output to the display 21 for confirmation. After that, the calculation processing unit 11 converts the setting value constant for protection calculation processing to form a secondary setting value, and stores the secondary setting value at the corresponding address in the secondary setting value storage area 27. to end the setting process.

Next, when a display request signal is sent from the setting/display request switch 23 via the signal line 28 and the digital input/output card 14, the arithmetic processing section 11 performs the setting with the display request during the idle time of the protection arithmetic processing. The value constant is determined by the output signal of the relay selection switch 24. Then, the arithmetic processing section 11
reads the primary setting value constant from the corresponding address in the primary setting value storage area 26, converts it into a predetermined secondary setting value format, and stores it in the corresponding secondary setting value storage area 27.
After confirming that it is equal to the quadratic setting constant of
The data in the primary setting value storage area 26 is output as is to the display 21, and the display processing is completed. here,
If the required data in the primary setting value storage area 26 is converted into the secondary setting value format and the value in the secondary setting value area 2 is
7, and if they do not match, the arithmetic processing unit 11 displays the display 2.
1 to display an abnormal code, and immediately locks the protection calculation process to execute fail-safe processing.

However, if the above-mentioned data value is within a predetermined tolerance range, the arithmetic processing unit 11 regards this as normal, outputs the data in the primary setting value storage area 27 to the display 21, and performs the protection arithmetic processing. It is also possible to create a system that continues.

As described above, according to the present invention, the primary setting value for display and the secondary setting value for protection calculation processing are stored in duplicate in different formats.
There is no need for inverse conversion during display processing, which not only makes it possible to match the set value and displayed value, but also allows you to use the primary set value storage area during inspection or monitoring using free time during protection calculation processing. The setting value is constantly monitored by converting the data (primary setting value) into a secondary setting value, and comparing and checking this with the data (secondary setting value) in the secondary setting value storage area. This has the remarkable effect of making it possible to confirm the absolute value and improving the ease of maintenance and reliability of the system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional digital protective relay device, and FIG. 2 is a block diagram of essential parts showing an embodiment of the present invention. 11... Arithmetic processing section, 12, 25... Memory section, 13... Analog input card, 14... Digital input/output card, 15, 20... Setting/display section 17... Setting value input/output signal line, 18 ...Setting/display request signal line, 21...Display device, 22...Setting device, 23...Setting/display request switch, 24...
Relay selection switch, 26...Primary setting value storage area, 27...Secondary setting value storage area, 28...Setting request signal line, 29...Display request signal line.

Claims (1)

[Claims] 1 After storing the primary setting value input from the setting unit in the primary setting value storage area of the memory, and converting the primary setting value into a secondary setting value that can be referenced in the process of protection calculation processing in the arithmetic processing unit. The secondary setting value is stored in a secondary setting value storage area of the memory, and during display processing, the arithmetic processing section converts the desired primary setting value stored in the primary setting value storage area into a corresponding secondary setting value. and compares the secondary setting value with the required secondary setting value stored in the secondary setting value storage area, and determines that both of the secondary setting values are acceptable values. A setting value setting display method for a digital protective relay device, characterized in that after confirming that the desired primary setting value stored in the primary setting value storage area is output to a display section.