JPS60226717A - Digital protective relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a digital protective relay system, and more particularly to a digital protective relay system that is easy to set for a plurality of relay elements.

[Technical background of the invention]

Conventional protective relay devices, when setting various relay elements,
Usually, this is done on each side using setting taps, rotary switches, variable resistors, etc. Taking a distance relay for power transmission line protection as an example of a protective relay device, its configuration consists of an overcurrent relay, a reactance relay, a ground fault overvoltage relay, a directional relay, and the like. Therefore, each of these relay elements must be set individually, and the number of relay elements may be several tens (or even two).Moreover, each of these setting values depends on the system to which the device is applied. It will differ depending on the

On the other hand, with the advancement of digital technology in recent years, digital computers such as microcomputers have been introduced. The application of arithmetic processing units to protective relay devices is being carried out both domestically and internationally. The great advantage of this type of Daisimel protective relay device is that it can be programmed with a digital arithmetic processing device instead of a device that conventionally combined multiple protective relay element circuits! Second, by processing multiple elements using the same hardware, it can be made smaller and more efficient.

However, if setting portions are individually provided for a large number of relay elements constituting this type of digital protective relay device, the advantage of miniaturization cannot be fully realized. Therefore, a method has been considered in which a plurality of setting values are written into the memory device g2 from one setting section.

Examples of this method include JP-A-54-137650, JP-A-56-74016, and JP-A-58-117778.
There are numbers etc.

Since each of these uses one setting section to set the setting values of a plurality of relay elements, the circuit configuration of the setting section consists of the following basic configuration.

■Means for selecting a relay element■Means for setting one numerical value■Storage section■Means for writing the numerical value of It has become conventional. The description of this setting range is based on the following reason.

The above-mentioned numerical value setting means employs a versatile configuration so that the setting values of all storage relay elements can be set. For example, it stores overcurrent relays and reactance relays,
Each setting value is IA to IOA.

For digital protective relay devices with a resistance of 50 to 100Ω,
A three-digit digital switch that allows setting of numerical values from 0 to 999 is commonly used. By the way, when a setting operator attempts to set a setting value, the numerical value setting means cannot determine whether or not the setting value to be set can be set by the corresponding digital protective relay device. Therefore, in conventional equipment, the entire setting range of all relay elements is written on the panel of the setting section.

[Problems with background technology]

In the above nine conventional configurations (2), there is a problem of increasing the size of the panel of the setting section.In other words, in the conventional method, it is necessary to indicate the setting range of all relay elements on the panel, and the number of relay elements is Generally, there are several dozen elements, so space is required to write the characters of the setting range for that number, and this is arranged on the panel together with the relay element selection means, numerical value setting means, and writing means mentioned above, making the panel larger. I can't escape.

[Purpose of the invention]

The present invention has been made with the aim of solving the above-mentioned problems, and it is possible to downsize the setting panel, and it can be used as a standard for protective relays with different protection methods in which the functions and number of elements of the storage relay elements are different. It is an object of the present invention to provide a digital protective relay having a setting device capable of displaying a setting range that can be used on both sides.

[Summary of the invention]

The present invention includes a numerical value setting means for setting a setting value, a selection means for selecting a relay element to be set from a plurality of stored relay elements, a storage means for storing the setting value, a write signal generation means, and a selection means. By providing the setting device with means for displaying the setting range of the relay element selected by and means for storing the setting range of each relay element, the setting range of all stored relay elements can be displayed on the display means. This is what I did.

[Embodiments of the invention]

An embodiment of the configuration of a digital protective relay according to the present invention is shown in FIG. In FIG. 1, 1 is a DigiMole arithmetic processing unit such as a microcomputer (hereinafter referred to as MPU), 2 is a settling device, and 3 is a bus. Mpul inputs the amount of electricity (not listed) of the protected system, and also inputs the setting value set by the setting device 2 from the bus 3, compares the magnitude, and determines whether there is a failure in the protected system. It determines that it is present, and outputs a trip output the next time. Since the details of the above content are sufficiently well known in the prior art, the explanation will be omitted, and the details of the configuration of the setting device 2 will be mainly explained.

4 is a numerical value setting circuit for setting a setting value; 5 is a selection circuit for selecting a relay element for which a setting value is to be set from a plurality of relay elements; 6 is a first storage circuit for storing a setting value; 7
is a switch that outputs a write signal for writing the set value set in the numerical setting circuit 4 into the first storage circuit 6;
8 is a control circuit; 9 is a display circuit that displays the settable range of the relay element selected by the selection circuit 5; 10 is a second storage circuit that stores the numerical value of the settable range of each relay element; 11 is a numerical value setting circuit 4, a selection circuit 5, a first memory circuit 6, a control circuit 8, a display circuit 9, and a second memory circuit 1.
This is a bus for transferring data between 0 and 0.

Here, the numerical value setting circuit 4 is, for example, a multi-digit digital switch, and the selection circuit 5 is, for example, a rotary switch,
It is known from the above-mentioned patent publication that the control circuit 8 can be configured with a microcomputer, and the display circuit 9 added in the present invention is an example.

For example, it can be configured using a 7-segment (7-digit) LgD (light emitting diode) display, and the second storage circuit 10 can be configured by writing numerical values into a read-only memory (ROM), for example.

2(a) and 2(b) are detailed explanatory diagrams of the display circuit 9, and show an example in which the numerical value setting circuit 4 has three digits, and (a) shows a case where the setting range is 1 to IOA. Regarding overcurrent relays, Mon) shows examples of reactance relays of 5 to 100Ω. In Fig. 2(a)(b),
The display circuit 9 has 7 displays 1 so that it can display up to 7 digits.
From 2s to 12t, the indicators 12+ to 123 are used to display the lower limit value of the setting range, the indicators 125 to 12F are used to display the upper limit value, and the indicator 124 is used to display the continuous value from the lower limit value to the upper limit value. It is used as a symbol to indicate the average value.

According to the configurations shown in FIGS. 2(a) and 2(b), the setting range for the relay element selected by the selection circuit 5 can be clearly displayed, and the number of digits displayed for the upper and lower limit values is the same as that of the numerical setting circuit 4. Since it is a number of digits, it is possible to display all the setting ranges of the relay elements to be set using the numerical value setting circuit 4tl.

FIG. 3 is a diagram showing an example of address assignment in the second storage circuit 10 for storing the setting range of the relay element shown in FIG. 2(&)(b).

In FIG. 3, address A1 of the second memory circuit 10.

The lower limit value and upper limit value of the overcurrent relay, and the lower limit value and upper limit value of the reactance relay are stored at addresses A2, A3, and A4, respectively. Therefore, the content of the A1 address is the same as the displays 121 to 123 in FIG. 2(&), and the content of the A2 address is the same as the displays 12s to 123 of FIG.
It is the same as 127. The contents of this person's addresses 1 to A4 are written in advance.

The response of the control circuit 8 is carried out according to the program C2 in the control circuit 8, a flowchart of which is shown in FIG.

In process F1, the name of the relay element to be set is read out from the selection circuit 5. This element name is stored in process F2. Processing F
In step 3, the numerical values in the settable range regarding the relay elements read out in the process F1 are read out from the second storage circuit 10 and a page-out process is performed. The result of this process F3 is the process F3.
4, the signal is output to the display circuit 9 and displayed. Process F5 is a process for determining whether the switch 7 is turned on, and if it is not turned on, the process moves to process F1.

When it is turned on, the process moves to process F6, and in process F6, a process of reading out a set value from the numerical value setting circuit 4 is performed. Then, in process F7, the setting *t- is written into the first memory circuit 6. In this write process, the area in which the setting value is written into the first memory circuit 6 is determined in advance for each relay element, and The area is determined according to the relay element name stored in F2.

After the process F7 ends, the process returns to process F1.

Since the control circuit 8 executes the processing described above with reference to FIG. 4, the settling operation procedure in the settling device having the configuration shown in FIG. 1 is as follows.

Step 1 Selection of the relay element by the setting operator in the selection circuit 5 Step 2 Confirmation of the settable range of the relevant relay element on the display circuit 9 by the setting operator Step 3 Setting by the setting operator on the numerical value setting circuit 4 Value setting step 4. Generation of a write signal by the setting operator at the switch 7. Step 5. Writing of the setting value to the first storage section by the control circuit 8. Step 6. Reading of the setting value by Mpull 2 and protection calculation. According to the configuration of the present invention shown in FIG.
Since only one display circuit is required to display the stability range of all relay elements, it is possible to downsize the setting section panel.
Furthermore, it is possible to provide a digital protection relay having a setting device that can be easily applied to protection relays of different protection methods with different housing relay elements and number of elements by simply changing the entire storage contents of the second storage circuit.

(Other Embodiments) FIG. 5 shows another embodiment of the present invention, which is the same as FIG. 1.
Since the constituent elements using symbol sounds are the same, their explanation will be omitted.

In FIG. 5, the output of the selection circuit 5 is the output of the buffer circuit 1.
3. Input to the third storage circuit 14 and the fourth storage circuit 15. Buffer circuit 13 outputs the input to bus 11 . The third storage circuit 14 and the fourth storage circuit 15 are circuits that store the lower limit value and upper limit value of the setting range of each relay element, respectively, and are display circuits for the relay element specified by the output of the selection circuit 5. Output to 9. The processing of Mpu8A is the processing shown in FIG. 4 - Al et al. processing F3 and F4? Execute the process that was removed.

Using the display example shown in FIG. 2, the stored contents of the third storage circuit 14 and the fourth storage circuit 15 are the contents of addresses A1 and A3 and addresses A2 and A4 in FIG. 3, respectively.

In the case of the other embodiment of the present invention according to FIG. 5 explained above,
It is clear that the effect is the same as in the case of FIG. 2, except that the processing of the CPU 8 can be reduced.

FIG. 6 shows another embodiment of the display circuit according to the present invention, which can be replaced with the display circuit 9 in FIGS. 1 and 5.

In FIG. 6, the display circuit C consists of a relay element display section, a setting range display section, and a setting value display section. The relay element display section Takumi displays the name of the relay element selected by the selection circuit 5, the setting range display section 17 displays the settable range of the relay element selected by the selection circuit 5, and the setting value display section 18 displays the numerical value. Setting circuit 4 (: This is a circuit that displays each set value under the control of the control circuit 8. FIG.
For reactance relays in the imaging range of 5 to 100Ω, all cases where a setting value of 10Ω is set are shown, and the device symbol of the reactance relay name f 1448Xs J is shown.

The relay element display unit 15 is configured using a display device with as many characters as necessary to display the device symbols of all relay elements, but the example in FIG. 6 shows a case of 5 characters.
Displays 191.19t, 19s, 194 and 196
Consisting of The data of this device symbol can be stored in the second storage circuit 10 in the same way as the setting range. The displays 191 to 19g are, for example, 16 segment LE
It can be configured with a D display or a dot matrix display.

The setting range display unit 17 has exactly the same configuration as the display circuit 9 in FIG. 1, and is composed of indicators 121 to 12γ.

The set value display section 18 is constructed using a display having the same number of digits as the numerical value setting circuit 4, and the example shown in FIG. The indicators 128 to 12+e are, for example, 7-segment LEDs.
Can be configured with a display.

According to the configuration according to the present invention shown in FIG. 6 explained above, the first
In addition to the effect of the configuration shown in the figure, the name of the relay element for which the setting value is to be set, the setting range of this relay element, and the setting value of this relay element are displayed, and the setting operation is made easier. be.

Note that the display circuit according to the present invention is not limited to that shown in FIG.
8 does not necessarily have to be present. Also, relay element display section 1
Display of device symbols from 6 companies 1: Not limited to this, it may be displayed using katakana, kanji, etc.

Although several embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications described below can be made.

(1) In the configurations shown in FIGS. 1 and 5, the Mpul reads out the contents of the first storage circuit 6 via the bus 3; however, the present invention is not limited to this; is connected to the first storage circuit 6 via the bus 11.
The configuration may be such that the contents of the file are read out. In this case,
The switch 7 may be connected to the Mpul so that all the functions of the control circuit 8 are performed by the Mpul, and the control circuit may be omitted.

(2) In the configuration example shown in FIG. 5, the first storage circuit 6 for the setting value
Although the configuration is shown in which the control circuit 8 consisting of a microcomputer performs writing control to the
It may be constructed using the known lead control method disclosed in No. 34.

(3) For the first memory circuit 6 in the configurations shown in FIGS. 1 and 5, from the viewpoint of device operation, it may be desired that the memory of the set value is not erased even when the power is turned off. Such a technique is disclosed, for example, in Japanese Patent Application Laid-Open No. 1726-1985,
For example, a memory element called g FROM may be used, which retains the contents even when the power is turned off. In this case, the storage contents of the second storage circuit 10 can be stored in the first storage circuit 6, and the second storage circuit 10 can be omitted.

(4) In the examples of ratio display circuits shown in FIGS. 2 and 6, the setting range and the setting value are all integer values, but the configuration can be made in exactly the same way if the setting range and the setting value are all integer values. When the setting range has a value below the decimal point, the stored contents of the second storage circuit 1o may include decimal point display data. In addition, regarding the display of a set value that has a value below the decimal point, the number of digits below the decimal point can be fixed for each relay element, so when displaying the set value by the control circuit 8I, the relay element is determined and displayed. do it.

(5) The examples of ratio display circuits shown in Figures 2 and 6 show the case where no unit is added to the display of each numerical value, but for example, in the case of an actance relay, the setting range is "5 to 1".
00Ω", and the setting value is "rlOΩ", and t may be easier to understand. In such a case, it is easy to add a display for this unit "Ω" to the entire display circuit.
The control circuit 8 determines all relay elements to determine and display the types of units such as Ω, A, and V. In addition, as a display device, a dot matrix display device and Japanese Patent Application Laid-Open No. 55-129834
4-36738) can be used.

(6) In the example of the display circuit shown in FIGS. 2 and 6,
Although an example in which a plurality of displays are combined is shown, it is clear that the present invention is not limited to this, and that a multi-digit display module such as a liquid crystal display, module, LCD display module, I, ED display module, etc. may be used. .

(7) In the above explanation, both the upper limit value and the lower limit value are displayed as the display of the setting range. However, the present invention is not limited to this. For example, in a three-digit numerical setting circuit, θ
Only numbers between 999 and 999 can be set. Therefore, for example θ
In the setting range of ~1o, even if only the upper limit value 10 is displayed, the lower limit value will naturally be O. In this case, the lower limit value may not be necessary. Similarly, in the case of 100 to 999, the upper limit value can be omitted.

(8) In the above explanation, a display circuit etc. is coupled to a bus, but instead of bus coupling,
It may be connected to the output terminal of the selection circuit as in No. 34.

〔Effect of the invention〕

As explained above, according to the present invention, the setting panel can be downsized by providing a setting device equipped with an indicator capable of displaying the setting range, and protection with different storage relay elements and different numbers of elements is possible. It is possible to provide a digital protective relay having a setting device that can be used as standard for protective relays of various types.

[Brief explanation of the drawing]

Fig. 1 is a diagram of an embodiment of the configuration of a digital protective relay according to the present invention, Fig. 2 is a diagram of an embodiment of a setting range indicator, and Fig. 3 is an address assignment of the second memory circuit in the configuration of Fig. 1. FIG. 4 is a diagram explaining the response of the control circuit in the configuration of FIG. 1, and FIG. 5 is a diagram for explaining an example. Another embodiment of the structure of the protective relay and FIG. 6 is a diagram of another embodiment of the setting range indicator. 1... Digital arithmetic processing unit 2... Setting device 4... Numeric value setting circuit 5... Selection circuit 6... First storage circuit 8... Control circuit 9.
...Display circuit 10...Second memory circuit (7317) Agent Patent attorney Noriyuki Chika (t
7 or 1 Cb) Figure 3 Figure 4

Claims (1)

[Claims] Numerical setting means for setting a set value, selection means for selecting one relay element from a plurality of relay elements, output means for generating a write signal, and a first means for storing the set value. a storage means, a second storage means for storing at least one of an upper limit value and a lower limit value that can be set as the setting value for the relay element I; and a display for displaying at least one of the upper limit value and the lower limit value. means, the selection means (2) regarding the selected relay element, when the write signal is generated, the ratio set in the numerical value setting means is set to the cough address (2) of the first storage means (2) and the setting value is A digital protective relay comprising a setting device that performs control to read out the upper limit value and the lower limit value stored in the second storage means and display them on the display means.