阅读说明：本技术 数字型保护继电装置和数字型保护继电装置的动作方法 (Digital protective relay device and method for operating digital protective relay device ) 是由 笹川悟 多田罗裕纪 于 2018-03-09 设计创作，主要内容包括：一种数字型保护继电装置,包括：输入电路(11),输入模拟电量并且转换为数字信号；运算处理部(21),使用经转换后的数字信号来执行各种的运算处理；输出电路(31),基于运算处理部(21)的判定结果,生成使开闭器进行动作的动作信号并进行输出；显示部(51),对应于从输入电路(21)输入的来自操作部(811)或外部设备的输入显示项目,来显示运算处理部(21)的输出；和存储部(23),记录并保存被输入到输入电路(21)的来自操作部(811)或外部设备的输入显示项目和时刻,在显示部(51)的显示项目变化的情况下,进行初始设定的显示项目和时刻与保存于存储部(23)中的最新的显示项目和时刻之间的比较。(A digital protective relay device comprising: an input circuit (11) which inputs an analog electric quantity and converts the analog electric quantity into a digital signal; an arithmetic processing unit (21) that executes various arithmetic processes using the converted digital signal; an output circuit (31) that generates and outputs an operation signal for operating the shutter based on the determination result of the arithmetic processing unit (21); a display unit (51) that displays the output of the arithmetic processing unit (21) in accordance with an input display item from the operation unit (811) or an external device, which is input from the input circuit (21); and a storage unit (23) for recording and storing the input display items and time from the operation unit (811) or the external device inputted to the input circuit (21), and comparing the display items and time set initially with the latest display items and time stored in the storage unit (23) when the display items of the display unit (51) change.)

1. A digital protective relay device is provided,

the digital protective relay device includes an arithmetic processing unit that converts an input analog electric quantity into a digital signal and performs arithmetic processing using the digital signal, and includes:

an output circuit that generates and outputs an operation signal for operating the circuit breaker based on the determination result of the arithmetic processing unit;

a display unit that sets a display item using an input from an operation unit or an input from an external device, and displays an output from the arithmetic processing unit according to the set display item; and

a lamp part showing its own operation state,

the arithmetic processing unit:

when the display item is set by an input from the operation unit or an input from the external device, the setting content and the input time of the display item are recorded after a predetermined time has elapsed under the set display item,

when the operation signal of the circuit breaker is generated by using the input from the operation unit or the input from the external device, the input from the operation unit or the input timing from the external device is recorded.

2. The digital type protective relay according to claim 1,

the arithmetic processing unit records a change time and the display item after the change when generating a setting signal for the display item of the display unit and changing the display item of the display unit.

3. The digital type protective relay according to claim 1 or 2,

the operation processing unit records a change time and a changed lighting state when the lighting signal of the lamp unit is generated and the lighting state of the lamp unit is changed.

4. The digital type protective relay according to any one of claims 1 to 3,

the operation processing unit records a time when the circuit breaker is operated and an operation signal is generated by the output circuit according to a determination result, and the determination result.

5. An operation method of a digital protective relay device,

the digital protective relay device includes: an arithmetic processing unit that converts the input analog electric quantity into a digital signal and performs arithmetic processing using the digital signal; an output circuit that generates and outputs an operation signal for operating the circuit breaker based on the determination result of the arithmetic processing unit; a display unit that sets a display item using an input from an operation unit or an input from an external device, and displays an output from the arithmetic processing unit according to the set display item; and a lamp unit showing its own operation state, wherein the operation method of the digital protective relay device is characterized in that,

setting the display item by an input from the operation unit or an input from the external device, recording a setting content and an input time of the display item after a predetermined time elapses under the set display item,

when the operation signal of the circuit breaker is generated by the input from the operation unit or the input from the external device, the generation time of the operation signal is recorded,

reading the recorded setting content and input time of the display item when the protected device of the digital protective relay device is not in failure and the display item set in the display unit is changed,

and reading the recorded generation time of the action signal of the circuit breaker when the protected equipment of the digital protective relay device is not in fault and the lighting state of the lamp part is changed.

Technical Field

The present invention relates to a digital protective relay device mounted on a distribution board or the like and an operation method thereof.

Background

The digital protective relay device is an apparatus as follows: an accident of a power system and a failure of a device to be protected in the power system (hereinafter, both are collectively referred to as "failure or the like") are detected, and a switch provided in a circuit breaker or the like is opened, thereby protecting the device to be protected.

In the digital protective relay device, a relay circuit is housed in a case and has an operation panel on a front surface. On the operation panel, a display signal such as a measured value and a signal indicating an abnormality are displayed, and a specific signal to be displayed, for example, a real-time measured value of current and voltage, is displayed by switching a switch or the like.

In a conventional digital protective relay device, when detecting a fault or the like in a power system, an open signal is output to a switch such as a circuit breaker in order to open and limit a section such as the fault, and information on a protection element to be operated and a corresponding phase is displayed on an operation display. At this time, when a failure or the like occurs or when maintenance inspection is performed, the maintenance/operator confirms the operation state through the operation display of the digital protective relay device.

However, when a power failure occurs due to a manual operation or the like other than a failure or the like, even if the digital protective relay device does not fail, it may be erroneously determined that the failure has occurred, and unnecessary cause finding, a confirmation test of soundness, or the like must be performed.

In view of the above problems, the applicant proposed the following digital protective relay devices: by providing the operation panel with a display unit that displays an operation during operation and an operation record recorded in the memory at the start of operation, even when a power failure occurs due to a manual operation other than a failure or the like, it is possible to distinguish and determine whether the operation display has been forgotten to be restored due to the power failure or whether the operation has been caused by the failure or the like (see patent document 1).

Further, a protective relay device is disclosed which stores a plurality of time-series data from the occurrence time of a failure or the like until a predetermined time elapses, and displays data at a specified time (see patent document 2).

Disclosure of Invention

Technical problem to be solved by the invention

As described above, in the conventional digital protective relay device, a fault or the like and a power failure are triggered and recorded. Therefore, even if a failure or a power failure does not occur, it is difficult to confirm whether the state of the display unit or the alarm lamp has changed or the input/output contacts of the digital protective relay device itself have operated due to a human operation or due to an abnormal operation of the device, that is, the cause of the operation.

The present application discloses a technique for solving the above-described problems, and an object of the present application is to provide a digital protective relay device capable of confirming whether a change in display contents of a display unit of the digital protective relay device and a change in lighting state of a lamp (hereinafter referred to as a display change) are caused by a human operation or caused by an abnormal operation of the digital protective relay device itself.

Technical scheme for solving technical problem

A digital protective relay device disclosed in the present application is a digital protective relay device including an arithmetic processing unit that converts an input analog electric quantity into a digital signal and performs arithmetic processing using the digital signal, and includes: an output circuit that generates and outputs an operation signal for operating the circuit breaker based on the determination result of the arithmetic processing unit; a display unit that sets a display item using an input from an operation unit or an input from an external device, and displays an output from the arithmetic processing unit according to the set display item; and a lamp unit that shows an operation state of the lamp unit, wherein the arithmetic processing unit records a setting content and an input time of the display item after a predetermined time elapses under the set display item when the display item is set by an input from the operation unit or an input from the external device, and records an input from the operation unit or an input time from the external device when an operation signal of the circuit breaker is generated by an input from the operation unit or an input from the external device.

A method for operating a digital protective relay device according to the present application includes an arithmetic processing unit that converts an input analog electric quantity into a digital signal and performs arithmetic processing using the digital signal, an output circuit that generates and outputs an operation signal for operating a circuit breaker based on a determination result of the arithmetic processing unit, a display unit that sets a display item using an input from an operation unit or an input from an external device and displays an output from the arithmetic processing unit according to the set display item, and a lamp unit that shows an operation state of the digital protective relay device, the method comprising: setting the display item using an input from the operation section or an input from an external device, recording the setting content and the input time of the display item after a prescribed time passes under the set display item, recording a generation timing of the operation signal when the operation signal of the circuit breaker is generated by an input from the operation unit or an input from the external device, reading the recorded setting content and input time of the display item when the protected device of the digital protective relay device is not in failure and the display item set in the display unit is changed, and reading the recorded generation time of the action signal of the circuit breaker when the protected equipment of the digital protective relay device is not in fault and the lighting state of the lamp part is changed.

Effects of the invention

According to the digital protective relay device and the method for operating the digital protective relay device disclosed in the present application, since the input information and the input time set by the operation unit or the external device are recorded, it is possible to determine whether or not the display change of the digital protective relay device is caused by a human operation.

Drawings

Fig. 1 is a block diagram showing a schematic configuration of a digital protective relay device according to embodiment 1.

Fig. 2 is an external view showing an operation panel of the digital protective relay according to embodiment 1.

Fig. 3 is a flowchart showing a recording procedure of an input process of the operation unit of the digital protective relay according to embodiment 1.

Fig. 4 is a flowchart showing a recording procedure of an input process from an external device to the digital protective relay device according to embodiment 1.

Fig. 5 is a flowchart showing a procedure of recording input processing relating to the operation of the circuit breaker to the digital protective relay device according to embodiment 1.

Fig. 6 is a flowchart showing a procedure of recording a change of a display item in the digital protective relay device according to embodiment 2.

Fig. 7 is a flowchart showing a recording procedure when a signal of a contact output of the digital protective relay device according to embodiment 2 is generated.

Detailed Description

The present embodiment will be described below with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals.