JPH0216092B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a digital protective relay, and more particularly to a digital protective relay having a small-sized setting section of a digital relay having a large number of relay elements.

[Technical background of the invention]

The technology of applying microcomputers to protective relays that protect power systems is widely known. However, in conventional analog protective relays, each relay element has an independent hardware configuration, so the setting values that determine the operating values of these relays are determined by the setting section created for each relay element. It was established individually by

On the other hand, in a digital relay, one hardware configuration can usually have a relay operation determination function equivalent to that of several dozen conventional relay elements. In digital relays that have a determination function for an extremely large number of relay elements, it is possible to miniaturize each operation determination circuit by providing a setting section for each relay element, but it is possible to downsize the operation determination circuit section individually. Therefore, miniaturization of the entire relay would be compromised. Therefore, various methods have been proposed to reduce the size of the settling section and improve the reliability of the circuit.

Here, a conventional digital relay configuration in which one digital relay protects a plurality of power transmission lines and the protective relay elements of each power transmission line are substantially the same will be described with reference to FIG.

In FIG. 1, a plurality of electrical quantities (v, i) from a power system are input to a filter circuit 1 for mainly extracting fundamental wave components. The output of this filter circuit 1 is input to a sample and hold circuit 2 in order to sample all inputs simultaneously, and the output of this sample and hold circuit 2 is inputted to a multiplexer circuit 3, which sequentially and serially samples analog signals.
The signal is output to the digital conversion circuit 4 and subjected to analog-to-digital conversion. Here, the analog-to-digital converted relay input is sent to the data memory (MEMO) in the arithmetic processing unit 6 by the direct memory access control circuit 5. This arithmetic processing unit 6 receives voltage and current information of digital values sent from the direct memory access control circuit 5, and a setting unit 7.
The relay operation is determined using the set value read from the bus 15 via the bus 15, and when it is determined that the relay is operating, the relay output 8 is derived.

The above-mentioned settling section 7 has the configuration shown below. That is, the setting section 7 includes the storage section 12 and the setting operation section 1.
3. Write switch 14, multiplexer circuit 1
1, a first selection means 9 and a second selection means 10. Output S9 of the first selection means 9 that selects a power transmission line to be settled from a plurality of power transmission lines.
and the output S10 of the second selection means 10 for selecting a relay element are connected to a multiplexer circuit (hereinafter referred to as MPX).
11). Then, the MPX 11 inputs the outputs S9 and S10, converts them into pure binary numbers, and further outputs an address signal S11 specifying an address to the storage section 12. The setting operation section 13 is composed of a digital switch, etc., and sets the setting value to be set, and sends the value to the data S13.
The data is output as data and input to the storage unit 12 as data. The write switch 14 outputs a write signal S14, and the first selection means 9 and the second selection means 1
Address signal S11 selected and determined by
The setting value data S13 from the setting operation section 13 is written into the storage section 12 according to the address value.

The first selection means 9 is composed of, for example, a rotary switch, and has contacts corresponding to the number of selectable power transmission lines, an output signal line of this contact, and a 0V
By selecting the power transmission line to be settled, the common terminal and the selected contact are connected, and the output signal line is output as a signal "0". The second selection means is also similar to the first selection means 9, and consists of a relay element contact, a signal line of the contact, and a common terminal.

According to the conventional device shown in FIG. 1 above, in order to set the relay element to be settled, first, the first selection means selects the power transmission line to which the relay element belongs, and then the second selection means selects the power transmission line to which the relay element belongs. Accordingly, the relevant relay element can be selected from among a plurality of relay elements, and therefore the setting section can be made smaller.

[Problems with background technology]

The conventional device having the above configuration has the following drawbacks.

In other words, when all or some of the power transmission lines selected by the first selection means have a common relay element, the common relay element should originally be treated as a unique relay element. be. For example, in the protection of power transmission lines connected to a common bus, when setting relay elements that receive grid current as input, it is common to use different settings for each transmission line, but when only grid voltage is input, In the case of relay elements such as undervoltage relay elements and earth fault overvoltage relay elements, the same setting values are shared for all transmission lines. However, in the conventional configuration shown in FIG. 1, since the first selection means can only select the power transmission line, the first selection means can select all the relay elements that are shared by all the power transmission lines. It is necessary to sequentially select the power transmission lines and set the setting values of the relay elements, and the setting operation is complicated and difficult to understand. To avoid this complexity,
In the configuration shown in FIG. 1, even if the first selection means adds a position for selecting a relay element common to all power transmission lines in addition to selecting the transmission line, the selection of the first selection means and the second Since the selection means can be arbitrarily combined, the first selection means can select one of the power transmission lines, and the second selection means can be used to select a relay element common to all the transmission lines. Therefore, the settling operation method is unclear and errors are likely to occur.

Such a setting method may lead to a setting error in the setting value, and there is a risk that the relay may malfunction or malfunction.

[Purpose of the invention]

The present invention has been made with the aim of solving the above-mentioned problems, and aims to provide a digital protective relay that allows easy setting operation and eliminates operational errors even when there are an extremely large number of relay elements to be set. There is.

[Summary of the invention]

The present invention includes a first selection means that selects each line of the power transmission line and a relay element common to each line, and a second selection means that can individually select a protection method. When a common relay element is selected, the input is configured to be common to each relay element of the second selection means, and the output from the first and second selection means is converted into a pure binary code. At this time, the address signal from the first selection means is set as an upper address, and the address signal from the second selection means is set as a lower address, and a combination of these is set in advance. The setting of the common relay elements is performed independently by the first selection means, and the setting of the individual relay elements is performed by a combination of each switch value from the first and second selection means. It is something.

[Embodiments of the invention]

Examples will be described below with reference to the drawings. FIG. 2 is a configuration diagram of one embodiment of the digital protection relay according to the present invention. In this case, only the portion corresponding to the setting section 7 is shown, and the other configuration is the same as that in FIG. 1. Therefore, the reference numeral 7A in FIG. 2 corresponds to 7 in FIG. Reference numerals 12 to 15 in the figure correspond to those in FIG. Note that 9A is the first selection means 9 with 1
0A corresponds to the second selection means 10, 11A, 1
1B is a multiplexer circuit divided into two (MPX)
and corresponds to 11.

In this example, a high-resistance grounded two-circuit power transmission line is protected, and a three-stage time-delayed relay system is used for short-circuit protection, and a ground-fault directional relay system is used for ground-fault protection. The first stage reactance element (hereinafter referred to as O ₁ ), the second stage reactance element (hereinafter referred to as O ₂ ), and the Mohr relay element (hereinafter referred to as Su) are used as relay elements for ground fault protection. In addition, for ground fault protection, a case is shown in which a ground fault direction relay element (hereinafter referred to as DG) and an earth fault overvoltage relay element (hereinafter referred to as OVG) are provided.

In FIG. 2, the first selection means 9A is the first line, the second line and a common relay element.
It is a means for selecting only one of the OVGs, and each selection corresponds to the contact points T ₉₁ , T ₉₂ , and T ₉₃ . And each signal from each of the contacts T ₉₁ to _{T 93}
Among S ₉₁ , S ₉₂ , and S ₉₃ , the signals S ₉₁ and S ₉₂ are the first
The signal S 93 is input to MPX11A, and the signal S ₉₃ is input to the first
While inputting to MPX11A, the first to fourth
is input to one input terminal of the AND circuits 16 ₁ , 16 ₂ , 16 ₃ , 16 ₄ . The second selection means 10A is O ₁ ,
It is a means to select only one from O ₂ , Su and DG elements, and each selection is a contact point T ₁₀₁ , T ₁₀₂ , T ₁₀₃
and T ₁₀₄ . Said contacts T ₁₀₁ , ~T ₁₀₄
The signals S ₁₀₁ , S ₁₀₂ , S ₁₀₃ , and S ₁₀₄ are input to the first to fourth AND circuits 16 ₁ to 16 ₄ , respectively.
The first AND circuit ₁₆₁ is the first selection means 9.
When the signal S ₉₃ from A and the signal S ₁₀₁ from the second selection means 10A are input and both are "1", that is,
It is "1" when contact T ₉₃ and contact T ₁₀₁ are not selected, and "0" when either one is "0".
A signal S ₁₆₁ is output. and said signal S ₁₆₁
is input to the second MPX 11B. Similarly, the second to fourth AND circuits 16 ₂ to 16 ₄ use signals S ₁₆₂ to
S ₁₆₄ are output to the second MPX 11B. 1st
MPX11A is the signal from the first selection means 9A.
Input S ₉₁ to S ₉₃ and set the data weights respectively.
The order of S ₉₃ , S ₉₂ , and S ₉₁ is converted into a pure binary code of negative logic, and a signal S _11A is output.

That is, when the first and second lines and OVG elements are selected from the first selection means 9A, the first
The inputs of MPX11A are 110, 101, and 011, respectively.
The signals _S11A at this time are pure binary codes of 00, 01, and 10, respectively. Similarly, the second MPX11B is a signal
S ₁₆₁ to _{S 164} are input, and the data weight is S ₁₆₄ ,
The signals S ₁₆₃ , S ₁₆₂ , and S ₁₆₁ are converted into pure binary codes and the signal S _11B is output. That is, O ₁ , O ₂ , Su and
When each DG element is selected, the second MPX1
The inputs of 1B are 1110, 1101, 1011, and 0111, and the signals _S11A at this time are 00, 01, 10, and 11, respectively.
In the storage unit 12, the signal S11A from the first MPX 11A is used as an upper address value, and the signal _S11A from the first MPX
The signals _S11B from 11B are respectively input as lower address values.

The first selection means 9A described above is composed of a rotary switch or the like, and has contacts T ₉₁ to T _9o corresponding to the selectable number and signals S ₉₁ to _{S 9o} sent out by signal lines from these contacts. and a common terminal _T0 connected to 0V, and when a power transmission line etc. to be set is selected, the common terminal _T0 and the selected contact are connected and the output signal is output as "0". It is something that will be done. Moreover, the second selection means 10A
The configuration is also the same as that of the first selection means 9A,
It consists of relay element contacts T ₁₀₁ to T _10o and signals S ₁₀₁ to _{S 10o} and a common terminal T ₀ .

Next, the operation will be explained. In FIG. 2, when the first line and the second line are selected by the first selection means 9A, the first selection means 9A and the second selection means 10A are connected to each other. Since there is no relay element, the selection of the relay element by the second selection means 10A is performed in the same manner as in the case of FIG. However, when the common relay element OVG is selected by the first selection means 9A, S ₉₃ =0, S ₉₂ =S ₉₁ =1
Therefore, the outputs S ₁₆₁ to _{S 164} from the first to fourth AND circuits 16 ₁ to 16 ₄ are all “0”. Therefore, the common relay element is selected by the first selection means 9A.
When OVG is selected, the upper address value of the storage unit 12 becomes 10, and the lower address value becomes 00 regardless of the selection position of the second selection means (one input of each AND circuit becomes S ₉₃ =0). Therefore, they all become "0").

FIG. 3 is a combination diagram of addresses of setting values of each relay element stored in the storage section.

As explained in FIG. 2, the output is 00 when the first line is selected by the first selection means 9A, 01 when the second line is selected, and 01 when the common relay element is selected. 10, which constitutes the upper address, and when each relay element O ₁ , O ₂ , Su, DG is selected by the second selection means 10A, the outputs are 00, 01, 10, 11, respectively. Since this constitutes the lower address, storage unit 1
The address assignment of the set value for each relay element in No. 2 is determined by the combination of the respective addresses.

That is, in the area of addresses 0000 to 0011, the setting value of the relay element for the first line is the area of addresses 0100 to 0111.
In the area, the setting value of the relay element for the second line is
Address 1000 has a common relay element
The set values of OVG are stored respectively.

As mentioned above, relay elements that require different settings depending on each line can be set by each combination of the first and second selection means, and common relay elements that are shared by each line can be set using different combinations of the first and second selection means. It can be settled using only the first selection means.

FIG. 4 shows another embodiment of the digital protection relay according to the present invention, and like FIG. 2, only the setting section is shown. In this embodiment, the configuration is partially changed to provide a display means. Reference numerals 12 to 15 in the figure correspond to those in FIG. In addition,
10B to 10A in Figure 2, 11C to 11A,
11D corresponds to 11B, respectively.

In FIG. 4, the first selection means 9B is means for selecting one of the two lines to be protected, and the contact T ₉₁ is the first line, and the contact T ₉₂ is the second line. Corresponding to the line, the signal S ₉₁ from said contact T ₉₁
is input to the first MPX 11C and also to the OR circuit 17. Also, the signal S ₉₂ is the first MPX1
Enter it as is in 1C. Then, the MPX 11C inputs the signals S ₉₁ and S ₉₂ , respectively, and inputs the signal S _11C to the storage unit 12 as an upper address value. The signal conversion at this time is the same as that described in FIG. 2 above. The output signal is "0" when a desired line is selected by the first selection means, and "1" when it is not selected, as in the previous embodiment.

The second selection means 10B selects O ₁ , O ₂ , Su, DG,
It is means for selecting one relay element from among the relay elements of the OVG, and selection of each relay element corresponds to contacts T ₁₀₁ , T ₁₀₂ , T ₁₀₃ , T ₁₀₄ and T ₁₀₅ , respectively. and the signal S ₁₀₁ from contacts T ₁₀₁ to T ₁₀₄ ,
S ₁₀₂ , S ₁₀₃ , S ₁₀₄ are indicators LD ₁ , LD ₂ , LD ₃ , LD ₄
and input to each cathode of the second MPX1
Enter in 1D. Note that the anode sides of the indicators LD ₁ to _{LD 4} are connected to the power supply V _CC through resistors R ₁ , R ₂ , R ₃ , and R ₄ respectively, and the signals S ₁₀₁ to S ₁₀₄ are "0",
That is, each relay element O ₁ , O ₂ , Su, and DG lights up when each is selected. Signal from said contact T _105
S105 is input to the OR circuit 17. and OR circuit 1
7 inputs signals S ₉₁ and S ₁₀₅ , and when both of these are "0", the first line is selected by the first selection means 9B, and the second selection means 1
When the OVG element is selected by 0B, a signal _S17 which becomes "0" is output. This signal S ₁₇ is displayed on the display LD ₅
along with the input to the cathode of the second MPX11
Enter in D. The anode side of the indicator LD ₅ is connected to the power supply V _CC via the resistor R ₅ as in each of the above cases, and lights up when the signal S ₁₇ is "0".

The second MPX 11D receives the signals S ₁₀₁ to S ₁₀₄ and the signal S ₁₇ from the second selection means 10B, and
_S11D is input to the storage unit 12 as the lower address value of the storage unit 12. Therefore, each relay element O ₁ ,
When O ₂ , Su and DG are selected, the signal S _11D is respectively
000, 001, 010, 011, and 100 when the first line is selected by the first selection means 9B and the OVG element is selected by the second selection means 10B. Note that, as explained in the previous embodiment, the storage unit 12 inputs the signal S _11C as the upper address value and the signal S _11D as the lower address value.

Next, the operation will be explained. In FIG. 4, selection of elements other than the OVG element by the second selection means 10B is the same as in FIG. 1. However, in the configuration shown in Figure 4, the display device LD ₁ ~ corresponding to the selected relay element
LD ₄ lights up differently.

In FIG. 4, the second selection means 10B
When trying to select and settle an OVG element, the first
Only when the first line is selected by the selection means, the signal _S17 becomes "0" and the indicator _LD5 lights up. This means that the lighting of the indicator can be set.

FIG. 5 is a combination diagram of addresses of setting values of each relay element stored in the storage section. As can be seen from Figure 5, in the area from addresses 0000 to 0011, the setting values of the relay elements for the first line are from addresses 1000 to 0011.
The area 1011 stores the set value of the relay element for the second line, and the address 0100 stores the set value of the OVG element.

FIG. 6 shows yet another embodiment of the digital protection relay according to the present invention. Marks 12 to 15 in the diagram
corresponds to Fig. 2. Also, 11A and 11E are the first and second MPX, and 9C and 10C are the first
selection means and second selection means. In this embodiment, a common relay element OVG and a time element OVG-T for performing a trip using the OVG element are added to the second selection means 10C.

In FIG. 6, the first selection means 9C is means for selecting any one of the first line, the second line, and the shared common relay element, and the common relay element is the OVG element. and OVG−
It is a T element. In the first selection means 9C, the first line, the second line, and the common relay element correspond to contacts T ₉₁ , T ₉₂ , and T ₉₃ , respectively. And the signal S ₉₁ from contact T ₉₁ is the first MPX 11A
It is also input to the AND circuit 18.
Similarly, the signal S ₉₂ from contact T ₉₂ is transmitted to said first MPX
11A and the AND circuit 18. Contact T ₉₃
The signal S ₉₃ from is input to the first MPX 11A, and is also input to OR circuits 19A and 19B, respectively. The AND circuit 18 inputs the signals S ₉₁ and S ₉₂ , and outputs the signal S ₁₈ which becomes "0" when either one is "0" to the OR circuits 19C, 19D, 19E, 19F.
Enter each. Here, the first MPX 11A receives the signals S ₉₁ , S ₉₂ , and S ₉₃ as inputs, and outputs the signal _11A to the storage section 12, as in FIG. 2 described above. This signal _S11A becomes a pure binary code of 00, 01, and 10 when each of the first and second lines and the common relay element is selected, and this becomes the upper address value of the storage section 12.

The second selection means 10C selects O ₁ , O ₂ , Su, DG,
It is means for selecting one of the relay elements of OVG and OVG-T, and each selection corresponds to the contacts T ₁₀₁ , T ₁₀₂ , T ₁₀₃ , T ₁₀₄ , T ₁₀₅ , and T ₁₀₆ . There is. The signals S ₁₀₁ , S ₁₀₂ , S 103 , S ₁₀₄ , S ₁₀₅ , S ₁₀₆ from each of the contacts T ₁₀₁ to T ₁₀₆ are _as follows:
The OR circuits 19C, 19D, 19E, 19F,
Input to 19A and 19B. and OR circuit 19
A to 19F are all logic circuits that output a signal that becomes "0" when both inputs are "0",
S _19A , S _19B , S _19C , S _19D , S _19E , S _19F respectively
Input to MPX11E, and display each
Input to the cathodes of LD ₅ to LD ₁₀ . The indicator
The anode sides of LD ₅ to _{LD 10} are connected to the power supply V _CC via resistors R ₅ to R ₁₀ , respectively, and are turned on when their respective cathode inputs are "0".

The second MPX 11E receives the signals S _19A to S _19F as input, and outputs the signal S _11E as the lower address value of the storage section 12 in the same manner as the MPX 11A and MPX 11B shown in FIG. In addition, the signals S _19C , S _19D ,
When each of S _19E , S _19F , S _19A , and S _19B is “0”,
The inputs of the second MPX11E are 111110, 111101,
111011, 110111, 101111, 011111, and the corresponding S _11E is 000, 001, 010, 011, 100, 101
becomes. As described above, the storage unit 12 receives the signal S _11A as the upper address value and the signal S _11E as the lower address value.

Next, the operation will be explained. In FIG. 6, when each relay element O ₁ , O ₂ , Su, and DG is selected by the second selection means 10C, the first selection means 9C
When the first line or the second line is selected, the signal S ₁₈ from the AND circuit 18 becomes "0", so the signals S _19C , S _19D , S _19E , S _19F become "0",
Displays connected to this signal LD ₇ , LD ₈ , LD ₉ ,
LD ₁₀ lights up.

On the other hand, when each relay element OVG, OVG-T is selected by the second selection means 10C and the common relay element is selected by the first selection means 9C, the signal S ₉₃ becomes "0", and this signal The signals from the OR circuits 19A and 19B, which have as inputs, become "0" and the indicators LD ₉ and LD ₁₀ light up. Therefore, by assuming that the lighting of the indicator means that setting is possible, the relay elements to be set that are selected by the second selection means 10C and become settable are the setting relay elements that need to be set for each line. In this case, only when the line is specified by the first selection means.
Further, in the case of a settling relay element shared by each line, this is only possible when the common relay element is specified by the first selection means.

FIG. 7 is a combination diagram of addresses of setting values of each relay element stored in the storage section. In Figure 7, the area from addresses 00000 to 00011 contains the setting values for the first line, and the area from addresses 01000 to 01011 contains the setting values for the second line.
The settings for the line are also set to address 10100 and
10101 stores the set value of the common relay element.

That is, in this embodiment, only when a common relay element is specified by the first selection means, the setting possibility of the common relay element selected by the second selection means is displayed, and when the first selection Only when a line is designated by the means, a settable indication of a setting relay element that needs to be set for each line is made.

FIG. 8 shows still another embodiment of the digital protection relay according to the present invention. In this embodiment, the first and second MPXs are omitted from the configuration shown in FIG.
Therefore, an attempt is made to make the device more compact. Therefore, all the symbols in the figure correspond to those in FIG. As a result of omitting the first and second MPX as described above, each signal S ₉₃ , S ₉₂ , S ₉₁ , S ₁₆₄ , from the first selection means 9A and the second selection means 10A,
S ₁₆₃ , S ₁₆₂ and S ₁₆₁ are input as address values of the direct storage section 12 .

FIG. 9 is a combination diagram of addresses of setting values of each relay element stored in the storage section. As can be seen from FIG. 9, as a result of the direct input of signals from each selection means, the address values stored in each relay element are not consecutive, and therefore the address area becomes wide. That is, in the configuration of FIG. 2, the maximum number of addresses is 1000, but in the configuration of this embodiment, the maximum number of addresses is 1101110.

In each of the above embodiments, a high-resistance grounded two-circuit power transmission line is the object of protection, and each relay element necessary for this protection is explained as an example, but it is not limited to this. This may be the case.

In other words, when protecting N-line power transmission lines connected to a bus configuration that is divided and operated by A and B, a common relay element is used for each bus of A and B.
OVG and OVG-T elements are required, and the selection by the first selection means is the sum of selecting one line from N lines and selecting one from the two common relay elements of Party A and Party B ( N+2) may be selected. In this case, the selection of the OVG element and the OVG-T element by the second selection means can be settled when the first selection means selects the first bus line or the second bus line.

In addition, although the above explanation describes the case where power transmission lines are to be protected, the case is not limited to this, and there are multiple power system facilities to be protected (for example, a group of transformers) that have multiple identical setting elements. , and it goes without saying that it is also applicable to the case where there are a plurality of setting elements shared among these facilities.

Further, in the above description, the first and second selection means are described as being constituted by rotary switches, but the present invention is not limited to this. Of course, it is not necessary to limit the configuration to a rotary switch.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a first selection means for specifying each of a plurality of power system equipment and a relay element that is shared between each of the power system equipment, and a first selection means for specifying each of a plurality of relay elements having different setting values. and a second selection means for selecting one from the following, specifying each relay element of the second selection means in accordance with the selection operation by the first selection means, and outputting each of these as an address value. As a result, the setting value from the setting operation unit can be set in correspondence with each other, so even when there are a large number of objects to be set, the setting unit of the digital relay can not only be made smaller, but also the setting operation can be clearly performed. can,
A digital protective relay that can prevent setting errors can be provided.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional digital relay, Figure 2
The figure is a configuration diagram of one embodiment of the setting section of the digital protective relay according to the present invention, FIG. 3 is a combination diagram of setting values and addresses in the storage section, FIG. 4 is a configuration diagram of another embodiment, and FIG. 5 is the storage section. A combination diagram of setting values and addresses in the section, FIG. 6 is a configuration diagram of another embodiment,
FIG. 7 is a combination diagram of set values and addresses in the storage section, FIG. 8 is a configuration diagram of still another embodiment, and FIG. 9 is a combination diagram of set values and addresses in the storage section. DESCRIPTION OF SYMBOLS 1... Filter, 2... Sample hold circuit, 3... Multiplexer, 4... Analog/digital switching circuit, 5... Direct memory access control circuit, 6... Arithmetic processing unit, 7, 7A, 7
B, 7C, 7D... Setting section, 9, 9A, 9B, 9
C...first selection means, 10, 10A, 10B,
10C...second selection means, 11, 11A, 11
B, 11C, 11D, 11E... multiplexer, 12... memory section, 13... setting operation section, 14
...Write switch.

Claims (1)

[Claims] 1. A plurality of relay elements to which different setting values are set for each of a plurality of power system equipment, and at least one relay element to which the same setting value is set to protect all or a part of the power system equipment. one common relay element, a setting section that sets a setting value for each relay element, a storage section that stores an output from the setting section according to the selection of each relay element, and a setting section that sets a setting value for the storage section. A write switch for writing a value, a first selection means for outputting an address signal for selecting one relay element from among the relay elements and writing it to a corresponding address in the storage unit, and a second selection means. means for selecting a power system equipment as a setting target, which the first selection means has, a selection means for a common relay element shared by the power system equipment, and the second selection means. has a plurality of relay element selection means having different setting values for each power system equipment, and a second selection means when a common relay element is selected by the first selection means.
means for blocking selective outputs of a plurality of relay elements having different set values in the selection means;
means for encoding the output from the selection means and outputting it to the storage unit, and when a specific power system equipment or common relay element is selected by the first selection means, each of the outputs by the second selection means is provided. A digital protective relay characterized in that it enables selection of relay elements or blocks selective output of each relay element. 2. A plurality of relay elements to which different setting values are set for each of the plurality of power system equipment, and at least one common relay element to which the same setting value is set in order to protect all or a part of the power system equipment. , a setting section for setting a setting value for each of the relay elements, a storage section for storing an output from the setting section according to the selection of each relay element, and a storage section for writing the setting value into the storage section. Digital protection comprising a write switch, and first and second selection means for outputting an address signal for selecting one relay element from among the relay elements and writing it to the corresponding address in the storage unit. In the relay, the first selection means has means for selecting power system equipment as a setting target, and the second selection means has means for selecting a plurality of relay elements having different setting values for each power system equipment. and means for selecting a common relay element shared by each power system equipment, and a selection output of the common relay element in the second selection means when a predetermined power system equipment is selected by the first selection means. a means for deriving, a display means responsive to the output from the second selection means, and a means for encoding the output from the first and second selection means and outputting the encoded output to the storage unit, A digital protective relay characterized in that when a specific power system equipment is selected by the first selection means, the common relay element and other relay elements can be selected and displayed by the second selection means. 3. A plurality of relay elements to which different setting values are set for each of the plurality of power system equipment, and at least one common relay element to which the same setting value is set to protect all or a part of the power system equipment. , a setting section for setting a setting value for each of the relay elements, a storage section for storing an output from the setting section according to the selection of each relay element, and a storage section for writing the setting value into the storage section. Digital protection comprising a write switch, and first and second selection means for outputting an address signal for selecting one relay element from among the relay elements and writing it to the corresponding address in the storage unit. In the relay, the first selection means has means for selecting power system equipment as a setting target, the means for selecting a common relay element shared by the power system equipment, and the second selection means has for each power system equipment. A selection means for selecting a plurality of relay elements having different setting values, a selection means for a common relay element shared by each of the power system equipment, and the first selection means, when any of the power system equipment is selected. means for selecting and displaying each relay element having a different setting value in a second selection means when selected; and a second selection means when a common relay element is selected by the first selection means; The first selection means includes means for selecting and displaying the common relay elements provided in the selection means, and means for encoding outputs from the first and second selection means and outputting the encoded signals to a storage unit. Therefore, when a specific power system equipment or a common relay element is selected, each relay element and the common relay element can be selected by the second selection means and are displayed. 4. A plurality of relay elements to which different setting values are set for each of the plurality of power system equipment, and at least one common relay element to which the same setting value is set in order to protect all or a part of the power system equipment. , a setting section for setting a setting value for each of the relay elements, a storage section for storing an output from the setting section according to the selection of each relay element, and a storage section for writing the setting value into the storage section. Digital protection comprising a write switch, and first and second selection means for outputting an address signal for selecting one relay element from among the relay elements and writing it to the corresponding address in the storage unit. In the relay, the first selection means has a selection means for power system equipment as a setting target, a selection means for a common relay element shared by the power system equipment, and each power system equipment has the second selection means. means for selecting a plurality of relay elements having different setting values for each relay element; and means for deriving a selection output of the common relay element in the second selection means when the common relay element in the first selection means is selected. and when a specific power system equipment or a common relay element is selected by the first selection means, each relay element can be selected by the second selection means, and the first and second
A digital protective relay characterized in that the output from the selection means is directly introduced into a storage section.