JPS59209015A - Digital protecting relaying unit - 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] The present invention relates to a digital protective relay device.

Conventionally, this type of device has been constructed from a plurality of units as shown in FIG. In Figure 1, 1 is a power system transmission line, 2 is a current transformer that transforms the current of the power transmission line 1, 3 is a transformer that transforms the output of current transformer 2, and 4 is the output of transformer 3. 5 is an analog-to-digital converter (ADC) that converts the output of filter 3 into a digital signal; 6 is a central processing unit (CPU); 7 is memory; 8 is an input/output device; 9 is an input/output device; 10 is a front panel connected to memory 9, which stores setting data;
Details are shown in Figure 2. The ADC 5 to the memory 9 are connected by a bus 6a. In FIG. 2, 11 is a selector for selecting a setting element, 12 is an indicator for displaying a setting value, 1
3 is a setting device for setting a set value.

Next, the operation will be explained. A current in a power transmission line 1 of a power system is transformed by a current transformer 2, and after being transformed by a transformer 3, it is input to a filter 4, where a fundamental wave component is extracted. The output of the filter 4 is converted into a digital signal by the ADC 5 and read into the CPU 6 via the bus 6a. CPU6
is the ADC5 according to the program stored in memory I.
Arithmetic processing for the protection operation is performed on the current data of the power transmission line 1 read from. On the other hand, since the set value set by the setter 13 on the front panel 10 is stored in the memory 9, the CPU 6 compares the set value in the memory 9 with the read current data, and determines whether the current in the power transmission line 1 is an abnormal value. In other words, it is determined whether there is an accident in the electric power system, and when it is determined that there is an accident, data is outputted to operate a circuit breaker (not shown) via the input/output blade device 8. The front panel 10 has a display 12, a setting device 13, and a selector 11, each of which allows display setting of arbitrary setting values and selection of setting elements.

Furthermore, the memory 9 is a nonvolatile memory that retains its stored contents even when the power is turned off. The digital protective relay device includes a plurality of devices having the configuration shown in FIG. 1 as a unit, and each performs processing for a protective operation on detected current data. In this case, memory 9
The setting value may be common to each unit) 148 to 14n, and the front panel 10 is used for changing the setting value, displaying the contents of data in the memory 9, etc., and is always used. isn't it. Therefore, each unit) 14a
It is clear that providing the memory 9 and the front panel 10 in ~14n becomes considerably redundant in terms of the function of the protective relay device.

Conventional digital protective relay devices are composed of multiple units with the same configuration as described above, and each unit includes a memory for setting, a front panel, etc., so the disadvantage is that the device is large and therefore expensive. was there.

According to this invention, it was made to eliminate the drawbacks of the conventional ones as described above, and one front panel for setting memory and setting function is installed in common in each unit, and the front panel for setting memory and setting function is installed in common in each unit. It is an object of the present invention to provide a digital protective relay device that can store common setting data in a setting memory and display the data in this memory.

An embodiment of the present invention will be described below with reference to FIG. The same reference numerals as in FIG. 1 indicate the same or equivalent parts. In FIG. 3, 14a to 14n each consist of the units shown in FIG. 1, and are connected to the shared memory 9 via a gate circuit 15 having an interface function. Memory 9 is connected to front panel 10 similarly to the unit shown in FIG.

Next, the operation will be explained. Each unit 14a to 14n
Since the operations within are as described above, repeated explanations will be omitted. Each unit 143 to 14n is
The set value data is read from the memory 9, transferred to the memory 1, and stored. Therefore, each CPU obtains setting value data from its respective memory 1. Normally, changing the set value and displaying the same are not performed frequently, so there is no problem in reading the memory 9 in practice. In each unit 14a to 14n, when the setting data in the memory 7 is lost due to the power being turned off, the data is stored again from the memory 9 via the gate circuit 15 after the power is turned on. The front panel 10 is used to change and confirm the setting values of the memory 9.

When the setting value of the memory 9 mentioned above is changed, the setting value data in each memory 7 is also changed. This is the selector 11
For example, the unit 14a is selected, a setting value is set in the setting device 13, the setting value is written in the memory 9, and this is further transferred to each memory 7 and written therein.

In the above embodiment, the setting value is stored in a memory common to each unit, but it may also be written directly to the memory in each unit via the front panel, or this memory may be constructed of non-volatile material. The same effects as in the above embodiment are achieved.

As described above, according to the present invention, the front panel and the setting memory installed in each unit can be used commonly for each unit, so that the device can be made inexpensive and compact. .

[Brief Description of the Drawings] Figure 1 is a block diagram showing the configuration of a unit of a conventional digital protective relay device, Figure 2 is a layout diagram of the components of the front panel shown in Figure 1, and Figure 3 is a block diagram showing the configuration of a unit of a conventional digital protective relay device. FIG. 1 is a block diagram showing the configuration of a digital protective relay device according to the invention. 1...Power transmission line, 2...Current transformer,...Transformer, 4
...Filter, 5...ADC16...CPU, 7
．． 9... Memory, 8... Input/output device, 10...-Front channel, 11... Selector, 12... Display, 1
3... Setting device, 14a-14n...-unit, 15
...Gate circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa No. 2 Figure 1 0 Figure 3 m-”

Claims (1)

[Claims] A central processing unit compares current data detected from the electric power system with a pre-stored set value, and outputs an output for protective operation to the electric power system based on the result of this comparison. In a digital protective relay device having a plurality of units, a single memory is commonly connected to each unit and stores the setting value, and a single memory is connected to this memory to select the unit and write the setting value to the memory. 1. A digital protective relay device, comprising: a panel for setting and displaying data contents of the memory.