JP2777128B2 - Setting circuit of protection relay - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a setting circuit for a protection relay, and more particularly to a setting circuit for a digital protection relay. [Technical background of the invention] In the conventional setting circuit, when setting various elements, the address of the storage unit is selected by the selection switch, the setting data is set by the setting switch, and the write switch is pressed, and the selection switch is used. The data set by the set switch is written to the address of the selected storage unit (for example, Japanese Patent Laid-Open No. 55-1298).
No. 34). However, in a device that protects and controls a power system, it is often necessary to change a program constant or the like due to a change in the configuration of the power system and a change in the accuracy of automatic monitoring in the device. At this time, the change of the program constant is conventionally performed by a read-only memory (hereinafter referred to as ROM
This was done by changing the contents of the program and replacing the ROM. In this case, every time it is necessary to change the contents of the ROM, it is necessary to rewrite the ROM and to turn off the power of the apparatus, which is troublesome and reduces the operation rate of the apparatus. Conventionally, there is a device in which necessary program constants are changed by a digital switch. FIG. 4 is a configuration diagram of a setting circuit according to a conventional method. In FIG. 4, the selection switch 1 is constituted by a digital switch, and an address A output from the selection switch is input as an address of the storage unit 3. The setting switch 2 is also constituted by a digital switch,
The data B output from the setting switch is input to the control unit 6 to settle the data. Further, the control unit 6 outputs the storage data E from the storage unit 3 to the display unit 5. The write switch 4 is for writing the setting data B set by the setting switch 2 to the address of the storage unit 3 specified by the selection switch 1, and is constituted by a push button switch. Here, when the write switch 4 is pressed, a write command signal C is output from the write switch, and the control unit 6 receiving the write command signal C outputs a write signal G to the storage unit 3. As a result, the setting data B is written and stored in the storage unit 3 via the control unit 6. The setting data written in the storage unit 3 is read by the central processing unit 8 and is used in the arithmetic processing as settling data. The constant setting switch 9 is for setting a program constant, and is constituted by a digital switch.
The data is input to the central processing unit 8 via the digital input unit 10, stored in the storage unit in the central processing unit, and used as a program constant. FIG. 5 is a diagram showing an example of the configuration of a setting panel. A selection switch 1, a setting switch 2, a writing switch 4, a display unit 5, and a constant setting switch 9 are provided on the panel surface. [Problems of Background Art] As can be seen from the configuration of the setting panel described above, since the constant setting switch 9 is provided on the panel, erroneous setting may be performed by careless operation. This means that it is easy to change the constants of the program, which has the disadvantage of having a great effect on the device. Further, when a large number of necessary program constants need to be changed, a large number of constant setting switches are required, which has a drawback that they cannot be accommodated in the setting panel. [Purpose of the Invention] The present invention has been made to solve the above-mentioned problems, and prevents infrequent data erroneous setting of program constants and the like due to careless operation, and also protects the apparatus from malfunctioning. It is intended to provide a settling circuit for a relay. [Summary of the Invention] In the present invention, a setting switch is provided to switch the type to be set and operated, so that the setting function is selectively used for setting and for setting data with a low frequency. This is intended to prevent erroneous setting of infrequent data setting due to careless operation. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of one embodiment of a setting circuit of a protection relay according to the present invention. In FIG. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, the selection switch 1 is constituted by a digital switch in the same manner as described above, and the address signal A from the selection switch is input to the control unit 6-1 together with the storage unit 3. The setting / setting changeover switch 7 is constituted by a push button switch, and switches between setting and program constant setting. That is, when the push button switch is not pressed, setting is performed, and when the push button switch is pressed, program constant setting and writing are performed. The control unit 6-1 determines whether or not to output the data D to the display unit 5 according to the presence / absence of the write display permission signal F output when the setting / setting changeover switch 7 is pressed and the address signal A from the selection switch 1. And whether to output the write signal G. Other configurations are the same as those in FIG. Next, the operation will be described. When the setting / setting changeover switch 7 is not pressed, in this case, if the value of the selection switch 1 is within the range of the setting item, the storage unit data E which is the setting data corresponding to the address designated by the selection switch 1 is stored. , Display unit 5
Output to At this time, by pressing the write switch 4, a write command signal C is output to the control unit 6-1, and the control unit 6-1 having received the write command signal C outputs a write signal G to the storage unit 3. In this case, the setting data B output from the setting switch 2 is written and stored as settling data in the storage unit 3 via the control unit 6-1. Here, if the value set by the selection switch 1 is set outside the range of the set item, even if the write switch 4 is pressed, the setting data B is not written to the storage unit 3 and the storage unit data E is further written to the display unit 5. There is no output. When the setting / setting changeover switch 7 is pressed, in this case, if the value of the selection switch 1 is within the range of the setting item, the storage unit data which is the program constant setting data corresponding to the address designated by the selection switch 1 E is output to the display unit 5. At this time, when the write switch 4 is pressed, a write command signal C is output to the control unit 6-1. Upon receiving the write command signal C, the control unit 6-1 outputs a write signal C to the storage unit 3. The control unit 6-1 having received the signal outputs the write signal G to the storage unit 3. In this case, the setting data B output from the setting switch 2 is written and stored as program constant setting data in the storage unit 3 via the control unit 6-1. If the value set by the selection switch 1 is set to a value other than the program constant item, the setting data B is not written to the storage unit 3 even if the write switch 4 is pressed, and the storage unit data E is output to the display unit 5. It will not be done. The settling data and the program constant data written in the storage unit 3 in this manner are read by the central processing unit 8 and used in the arithmetic processing as the settling data and the program constant data. Table 1 below shows the setting / setting changeover switch 7
And the setting items that can be displayed and written. In Table 1, ○ indicates significance, and X indicates otherwise. As shown in Table 1 specified above, a setting / setting changeover switch is provided on the panel of the setting circuit, and the setting function is selectively used for setting and for setting the program constant. By not performing the setting, the settling operation can be facilitated, and erroneous setting of the program constant or the like due to careless operation can be prevented. FIG. 2 is a structural view of the setting panel described in FIG. 1. A setting / setting changeover switch 7 is provided in place of the setting switch 9 described in the conventional example. According to the above-described embodiment, in addition to the settling operation, a setting operation of a less frequently used type such as a program constant can be performed, and a malfunction of the protection relay due to an erroneous setting of the program constant due to an inadvertent operation. Can be prevented. Further, by performing the settling operation and the program constant setting operation with one set / set changeover switch, the hardware can be reduced. FIG. 3 is a structural view of a setting panel showing another embodiment according to the present invention. In the present embodiment, the program constants are classified into two elements, a system constant and a constant monitoring constant, and a total of three switching operations of a setting operation similar to the conventional one, a newly provided system constant operation, and a constant monitoring constant setting operation are performed by three. A changeover switch is used, and these changeover switches are arranged on the back surface of the setting panel. What is indicated by a dotted line in FIG. 3 is the changeover switch 7-1 according to the present embodiment, which is arranged on the back surface of the setting panel. Other configurations are the same as those in FIG. Table 2 below shows the relationship between the types of changeover switches used in this embodiment and the setting items that can be displayed and written. In Table 2, ○ indicates significance, and X indicates not. In Table 2, it is possible to display and write the setting regardless of which changeover switch is selected, and it is only possible to display the system constant when the changeover switch for constant monitoring is selected. With the configuration as shown in FIG. 3 described above, only the setting that frequently changes can always be displayed and written. When it is desired to check all the set values, the changeover switch may be set to the constant monitoring setting. At this time, since the system constant cannot be written, it is possible to prevent the system constant from being set by careless operation. In addition, by setting the setting / setting changeover switch on the back of the setting panel and always switching to the setting state, it is possible to prevent inadvertent erroneous setting of system constants and constant monitoring constants. Prevention is more effective. The above circuit configuration is not limited to the embodiment. For example, the selection switch 1 may be a rotary switch, and the setting switch 2 may be a push button switch. The setting / setting changeover switch 7 is a plug,
The switching operation may be performed by inserting a jack. Further, writing and display at the time of setting / setting switching are not limited to the above-described embodiment, and various changes can be made. [Effects of the Invention] As described above, according to the present invention, the changeover switch is provided and the setting function is selectively used for setting and for setting data with a low frequency. This configuration not only facilitates the settling operation, but also enables easy setting of infrequent data other than the set value. Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment for explaining a setting circuit of a protective relay according to the present invention, FIG. 2 is a structural diagram of a setting panel according to the embodiment of FIG. FIG. 4 is a structural view of a setting panel according to another embodiment of the present invention, FIG. 4 is a structural view for explaining a conventional setting circuit, and FIG. 5 is a structural view of a conventional setting panel. 1 selection switch 2 setting switch 3 storage unit 4 writing switch 5 display unit 6, 6-1 control unit 7, 7-1 setting / setting changeover switch 8 ... Central processing unit, 9 ... Constant setting switch 10 ... Input device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-9324 (JP, A) JP-A-59-6678 (JP, A) JP-A-59-55448 (JP, A) JP-A 57- 6520 (JP, A) JP-A-59-209015 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02H 3/02

Claims (1)

(57) [Claims] A storage unit for storing set value data serving as a threshold value for the operation determination of the protection relay and operation determination program constant data for the protection relay at a predetermined address, a selection unit for selecting an address of the storage unit, and settling the data of the storage unit In a setting circuit of a protection relay comprising setting means and writing means for writing data settled by the setting means to an address of the storage unit selected by the selecting means, Switching means for dividing the settable type into respective writable address ranges according to the settling type and switching and selecting the settling type; and determining whether or not the address selected by the selecting means is within the address range of the settling type selected by the switching means. And if the address is within the address range of the setting type, the writing of the data by the writing means is permitted. A setting circuit for a protection relay, comprising: a determination control unit. 2. 2. The protection relay settling circuit according to claim 1, wherein the plurality of settling types have at least a type for setting the set value data and a type for setting the operation determination program constant data. Settling circuit. 3. A storage unit for storing set value data serving as a threshold value for the operation determination of the protection relay and operation determination program constant data for the protection relay at a predetermined address, a selection unit for selecting an address of the storage unit, and settling the data of the storage unit In a setting circuit of a protection relay comprising setting means and writing means for writing data settled by the setting means to an address of the storage unit selected by the selecting means, A switching unit for dividing the address range according to the setting type and switching and selecting the setting type; and determining whether an address selected by the selecting unit is within an address range of the setting type selected by the switching unit. When the address is within the address range of the settling type, the data stored in the address of the storage unit selected by the selection unit is stored. And a determination display means for displaying data.